@vivliostyle/core/lib/vivliostyle.js.map

{"version":3,"file":"vivliostyle.js","sources":["../src/vivliostyle/constants.ts","../src/vivliostyle/logging.ts","../src/vivliostyle/plugin.ts","../src/vivliostyle/profile.ts","../src/vivliostyle/base.ts","../src/vivliostyle/cfi.ts","../src/vivliostyle/exprs.ts","../src/vivliostyle/css.ts","../src/vivliostyle/geometry-util.ts","../src/vivliostyle/css-prop.ts","../src/vivliostyle/counters.ts","../src/vivliostyle/css-tokenizer.ts","../src/vivliostyle/task.ts","../src/vivliostyle/task-util.ts","../src/vivliostyle/net.ts","../src/vivliostyle/css-parser.ts","../src/vivliostyle/matchers.ts","../src/vivliostyle/css-cascade.ts","../src/vivliostyle/css-logical-util.ts","../src/vivliostyle/sizing.ts","../../../node_modules/fast-diff/diff.js","../src/vivliostyle/types.ts","../src/vivliostyle/diff.ts","../src/vivliostyle/vtree.ts","../src/vivliostyle/page-floats.ts","../src/vivliostyle/footnotes.ts","../src/vivliostyle/break.ts","../src/vivliostyle/layout-helper.ts","../src/vivliostyle/break-position.ts","../src/vivliostyle/display.ts","../src/vivliostyle/layout-processor.ts","../src/vivliostyle/layout-retryers.ts","../src/vivliostyle/layout-util.ts","../src/vivliostyle/shared.ts","../src/vivliostyle/pseudo-element.ts","../src/vivliostyle/layout.ts","../src/vivliostyle/repetitive-element.ts","../src/vivliostyle/table.ts","../src/vivliostyle/math-util.ts","../src/vivliostyle/columns.ts","../src/vivliostyle/css-styler.ts","../src/vivliostyle/css-validator.ts","../src/vivliostyle/font.ts","../src/vivliostyle/page-master.ts","../src/vivliostyle/css-page.ts","../src/vivliostyle/urls.ts","../src/vivliostyle/vgen.ts","../src/vivliostyle/xml-doc.ts","../src/vivliostyle/ops.ts","../src/vivliostyle/sha1.ts","../src/vivliostyle/toc.ts","../src/vivliostyle/epub.ts","../src/vivliostyle/adaptive-viewer.ts","../src/vivliostyle/core-viewer.ts","../src/vivliostyle/print.ts"],"sourcesContent":["/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Constants\n */\n\n/**\n * Debug flag.\n */\nexport let isDebug: boolean = false;\nexport function setDebug(value: boolean): void {\n  isDebug = value;\n}\n\n/**\n * Page progression direction.\n * @enum {string}\n */\nexport enum PageProgression {\n  LTR = \"ltr\",\n  RTL = \"rtl\",\n}\n\n/**\n * Return PageProgression corresponding to the specified string\n */\nexport function pageProgressionOf(str: string): PageProgression {\n  switch (str) {\n    case \"ltr\":\n      return PageProgression.LTR;\n    case \"rtl\":\n      return PageProgression.RTL;\n    default:\n      throw new Error(`unknown PageProgression: ${str}`);\n  }\n}\n\n/**\n * Page side (left/right).\n * @enum {string}\n */\nexport enum PageSide {\n  LEFT = \"left\",\n  RIGHT = \"right\",\n}\n\n/**\n * Viewer ready state.\n * @enum {string}\n */\nexport enum ReadyState {\n  LOADING = \"loading\",\n  INTERACTIVE = \"interactive\",\n  COMPLETE = \"complete\",\n}\n\n/**\n * Pubilc members of the bundled library.\n */\nexport const constants = {\n  PageProgression,\n  PageSide,\n  ReadyState,\n};\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Logging - Logging utility\n */\n\n/**\n * Log level.\n * @enum {number}\n */\nexport enum LogLevel {\n  DEBUG = 1,\n  INFO,\n  WARN,\n  ERROR,\n}\n\nexport type ErrorInfo = {\n  error: Error;\n  messages: any[];\n};\n\n/**\n * Class logging error, warning, information or debug messages.\n */\nexport class Logger {\n  private listeners: { [key in LogLevel]?: ((p1: ErrorInfo) => void)[] } = {};\n\n  constructor(private opt_console?: Console) {}\n\n  private consoleDebug(msg: any[]) {\n    if (this.opt_console) {\n      if (this.opt_console.debug) {\n        this.opt_console.debug(...msg);\n      } else {\n        this.opt_console.log(...msg);\n      }\n    } else {\n      console.debug(...msg); // eslint-disable-line no-console\n    }\n  }\n\n  private consoleInfo(msg: any[]) {\n    if (this.opt_console) {\n      if (this.opt_console.info) {\n        this.opt_console.info(...msg);\n      } else {\n        this.opt_console.log(...msg);\n      }\n    } else {\n      console.info(...msg); // eslint-disable-line no-console\n    }\n  }\n\n  private consoleWarn(msg: any[]) {\n    if (this.opt_console) {\n      if (this.opt_console.warn) {\n        this.opt_console.warn(...msg);\n      } else {\n        this.opt_console.log(...msg);\n      }\n    } else {\n      console.warn(...msg); // eslint-disable-line no-console\n    }\n  }\n\n  private consoleError(msg: any[]) {\n    if (this.opt_console) {\n      if (this.opt_console.error) {\n        this.opt_console.error(...msg);\n      } else {\n        this.opt_console.log(...msg);\n      }\n    } else {\n      console.error(...msg); // eslint-disable-line no-console\n    }\n  }\n\n  private triggerListeners(level: LogLevel, args: ErrorInfo) {\n    const listeners = this.listeners[level];\n    if (listeners) {\n      listeners.forEach((listener) => {\n        listener(args);\n      });\n    }\n  }\n\n  /**\n   * Add a listener function invoked when a log event with the specified level\n   * occurs.\n   */\n  addListener(level: LogLevel, listener: (p1: ErrorInfo) => void) {\n    let listeners = this.listeners[level];\n    if (!listeners) {\n      listeners = this.listeners[level] = [];\n    }\n    listeners.push(listener);\n  }\n\n  debug(...var_args: any[]) {\n    const args = argumentsToErrorInfo(arguments);\n    this.consoleDebug(buildMessageAndStackTrace(args));\n    this.triggerListeners(LogLevel.DEBUG, args);\n  }\n\n  info(...var_args: any[]) {\n    const args = argumentsToErrorInfo(arguments);\n    this.consoleInfo(buildMessageAndStackTrace(args));\n    this.triggerListeners(LogLevel.INFO, args);\n  }\n\n  warn(...var_args: any[]) {\n    const args = argumentsToErrorInfo(arguments);\n    this.consoleWarn(buildMessageAndStackTrace(args));\n    this.triggerListeners(LogLevel.WARN, args);\n  }\n\n  error(...var_args: any[]) {\n    const args = argumentsToErrorInfo(arguments);\n    this.consoleError(buildMessageAndStackTrace(args));\n    this.triggerListeners(LogLevel.ERROR, args);\n  }\n}\n\n/**\n * @param args\n */\nfunction argumentsToErrorInfo(args: IArguments): ErrorInfo {\n  const a = Array.from(args);\n  let e: Error = null;\n  if (a[0] instanceof Error) {\n    e = a.shift();\n  }\n  return { error: e, messages: a };\n}\n\nfunction buildMessageAndStackTrace(args: ErrorInfo): string[] {\n  const e = args.error;\n  const stack = e && (e[\"frameTrace\"] || e[\"stack\"]);\n  let messages = [].concat(args[\"messages\"]);\n  if (e) {\n    if (messages.length > 0) {\n      messages = messages.concat([\"\\n\"]);\n    }\n    messages = messages.concat([e[\"toString\"]()]);\n    if (stack) {\n      messages = messages.concat([\"\\n\"]).concat(stack);\n    }\n  }\n  return messages;\n}\n\nexport const logger = new Logger();\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Plugin - Plugin mechanism\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as LayoutProcessor from \"./layout-processor\";\nimport * as Logging from \"./logging\";\nimport * as Task from \"./task\";\nimport { Layout, Vtree } from \"./types\";\n\n/**\n * Type of implemented hooks.\n * @enum {string}\n */\nexport enum HOOKS {\n  /**\n   * Called when a single property declaration is parsed.\n   *\n   * The hook is called with an object with the following properties:\n   *   {string} name: Property name\n   *   {!Css.Val} value: Property value\n   *   {boolean} important: Whether '!important' flag is present or not\n   * Functions called by this hook are expected to return a value with the same\n   * type as the above. The declaration is then replaced by the returned value.\n   *\n   * Note that a shorthand declaration is not directly passed to this hook.\n   * After the shorthand declaration is interpreted and broken into\n   * non-shorthand declarations, the hook is called for each of the\n   * non-shorthand declarations.\n   */\n  SIMPLE_PROPERTY = \"SIMPLE_PROPERTY\",\n\n  /**\n   * Called when a single document (i.e. a single spine item) has been fetched,\n   * before parsing.\n   *\n   * The hook is called with the Document object.\n   */\n  PREPROCESS_SINGLE_DOCUMENT = \"PREPROCESS_SINGLE_DOCUMENT\",\n\n  /**\n   * Called before creating a text node for modifying a text content.\n   *\n   * The hook is called with an object with the following properties:\n   *   {Vtree.NodeContext} nodeContext\n   *   {string} sourceTextContent\n   *\n   * Functions called by this hook are expected to return a\n   * Task.Result.<string>. The text content is then replaced by the\n   * returned value.\n   */\n  PREPROCESS_TEXT_CONTENT = \"PREPROCESS_TEXT_CONTENT\",\n\n  /**\n   * Called before creating a element for modifying a element style.\n   *\n   * The hook is called with an object with the following properties:\n   *   {Vtree.NodeContext} nodeContext\n   *   {!Object} style\n   */\n  PREPROCESS_ELEMENT_STYLE = \"PREPROCESS_ELEMENT_STYLE\",\n\n  /**\n   * Called before geting CssCascade.polyfilledInheritedProps.\n   *\n   * The hook return a array of polyfilled inherited property name.\n   */\n  POLYFILLED_INHERITED_PROPS = \"POLYFILLED_INHERITED_PROPS\",\n\n  /**\n   * Called when a Viewer is configured.\n   *\n   * The hook is called with an object with the following properties:\n   *  {Base.JSON} command\n   */\n  CONFIGURATION = \"CONFIGURATION\",\n\n  /**\n   * Called when resolving a text node breaker\n   * which detects an acceptable breakpoint and break text node at this point.\n   *\n   * The hook is called with an object with the following properties:\n   *  {Vtree.NodeContext} nodeContext\n   *\n   * Functions called by this hook are expected to\n   * return an instnce of {Layout.TextNodeBreaker} or null.\n   */\n  RESOLVE_TEXT_NODE_BREAKER = \"RESOLVE_TEXT_NODE_BREAKER\",\n\n  /**\n   * Called when resolving a formatting context.\n   *\n   * The hook is called with the following parameters:\n   *   nodeContext: a NodeContext object\n   *   firstTime: a boolean flag representing whether this node is encountered\n   * for the first time or not display: an Css.Ident value representing\n   * 'display' value of the node position: an Css.Ident value representing\n   * 'position' value of the node float: an Css.Ident value representing\n   * 'float' value of the node isRoot: a boolean flag representing whether this\n   * node is a root (of a flow) or not Functions called by this hook are\n   * expected to return a formatting context for the NodeContext.\n   */\n  RESOLVE_FORMATTING_CONTEXT = \"RESOLVE_FORMATTING_CONTEXT\",\n\n  /**\n   * Called when resolving a layout processor (LayoutProcessor) for\n   * a formatting context.\n   *\n   * The hook is called with a formatting context\n   * (Vtree.FormattingContext). Functions called by this hook are expected\n   * to return a layout processor corresponding to the formatting context.\n   */\n  RESOLVE_LAYOUT_PROCESSOR = \"RESOLVE_LAYOUT_PROCESSOR\",\n\n  /**\n   * Called after laid out a block contents.\n   *\n   * The hook is called with an object with the following properties:\n   *  {Vtree.NodeContext} nodeContext\n   *  {Array.<Vtree.NodeContext>} checkPoints\n   *  {Layout.Column} column\n   */\n  POST_LAYOUT_BLOCK = \"POST_LAYOUT_BLOCK\",\n}\n\nexport type PreProcessSingleDocumentHook = (p1: Document) => any;\n\nexport type PreProcessTextContentHook = (\n  p1: Vtree.NodeContext,\n  p2: string,\n) => Task.Result<string>;\n\nexport type PreProcessElementStyleHook = (\n  p1: Vtree.NodeContext,\n  p2: object,\n) => void;\n\nexport type PolyfilledInheritedPropsHook = () => string[];\n\nexport type ConfigurationHook = (\n  p1: Base.JSON,\n) => {\n  needResize: boolean | null | undefined;\n  needRefresh: boolean | null | undefined;\n};\n\nexport type ResolveTextNodeBreakerHook = (\n  p1: Vtree.NodeContext,\n) => Layout.TextNodeBreaker;\n\nexport type ResolveFormattingContextHook = (\n  p1: Vtree.NodeContext,\n  p2: boolean,\n  p3: Css.Ident,\n  p4: Css.Ident,\n  p5: Css.Ident,\n  p6: boolean,\n) => Vtree.FormattingContext;\n\nexport type ResolveLayoutProcessorHook = (\n  p1: Vtree.FormattingContext,\n) => LayoutProcessor.LayoutProcessor;\n\nexport type PostLayoutBlockHook = (\n  p1: Vtree.NodeContext,\n  p2: Vtree.NodeContext[],\n  p3: Layout.Column,\n) => void;\n\nconst hooks = {};\n\n/**\n * Register a function to a hook with the specified name.\n * The registered function is called at appropriate timings by the core code.\n * Arguments passed to the function depend on the hook.\n * When multiple functions are registered, they are called by the order in which\n * they are registered.\n * @param name Name of the hook.\n * @param fn Function to be registered to the hook.\n */\nexport function registerHook(name: string, fn: (...p1) => any): void {\n  if (!HOOKS[name]) {\n    Logging.logger.warn(new Error(`Skipping unknown plugin hook '${name}'.`));\n  } else {\n    let hooksForName = hooks[name];\n    if (!hooksForName) {\n      hooksForName = hooks[name] = [];\n    }\n    hooksForName.push(fn);\n  }\n}\n\n/**\n * Remove a function already registered to the specified name.\n * Note that even if the same function are registered multiple times, this\n * method removes only the first one.\n * @param name Name of the hook.\n * @param fn Function to be removed from the hook.\n */\nexport function removeHook(name: string, fn: (...p1) => any): void {\n  if (!HOOKS[name]) {\n    Logging.logger.warn(new Error(`Ignoring unknown plugin hook '${name}'.`));\n  } else {\n    const hooksForName = hooks[name];\n    if (hooksForName) {\n      const index = hooksForName.indexOf(fn);\n      if (index >= 0) {\n        hooksForName.splice(index, 1);\n      }\n    }\n  }\n}\n\n/**\n * Get all hooks registered to the specified name.\n * This method is for internal use (from the core code).\n */\nexport function getHooksForName(name: string): ((...p1) => any)[] {\n  const hooksForName = hooks[name];\n  return hooksForName || [];\n}\n\n/**\n * Pubilc members of the bundled library.\n */\nexport const plugin = {\n  registerHook,\n  removeHook,\n};\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Profile - Utility for profiling\n */\nimport * as Logging from \"./logging\";\n\n/**\n * Performance profiler measuring execution time of the script.\n */\nexport class Profiler {\n  timestamps: { [key: string]: { [key: string]: number } } = {};\n  private registerTiming: (p1: string, p2: string, p3?: number) => any;\n  registerStartTiming: (name: string, timestamp?: number) => any;\n  registerEndTiming: (name: string, timestamp?: number) => any;\n\n  constructor(public readonly performanceInstance: Performance) {\n    this.registerTiming = noop;\n\n    // hack to export (non-prototype) methods\n    this[\"registerStartTiming\"] = this.registerStartTiming = noop;\n    this[\"registerEndTiming\"] = this.registerEndTiming = noop;\n  }\n\n  /**\n   * Registers start timing of some event, even if profile is disabled.\n   * @param name Name of event\n   * @param timestamp Used as the actual timestamp of the event if specified,\n   *     instead of \"now\"\n   */\n  forceRegisterStartTiming(name: string, timestamp?: number) {\n    registerTiming.call(this, name, \"start\", timestamp);\n  }\n\n  /**\n   * Registers end timing of some event, even if profile is disabled.\n   * @param name Name of event\n   * @param timestamp Used as the actual timestamp of the event if specified,\n   *     instead of \"now\"\n   */\n  forceRegisterEndTiming(name: string, timestamp?: number) {\n    registerTiming.call(this, name, \"end\", timestamp);\n  }\n\n  /**\n   * Log registered timings (start/end/duration).\n   * All values are printed in ms unit.\n   */\n  printTimings() {\n    const timestamps = this.timestamps;\n    let st = \"\";\n    Object.keys(timestamps).forEach((name) => {\n      const stamps = timestamps[name];\n      const l = stamps.length;\n      for (let i = 0; i < l; i++) {\n        const t = stamps[i];\n        st += name;\n        if (l > 1) {\n          st += `(${i})`;\n        }\n        st += ` => start: ${t[\"start\"]}, end: ${t[\"end\"]}, duration: ${t[\n          \"end\"\n        ] - t[\"start\"]}\\n`;\n      }\n    });\n    Logging.logger.info(st);\n  }\n\n  /**\n   * Disable profiling.\n   */\n  disable() {\n    this.registerTiming = noop;\n\n    // hack to export (non-prototype) methods\n    this[\"registerStartTiming\"] = this.registerStartTiming = noop;\n    this[\"registerEndTiming\"] = this.registerEndTiming = noop;\n  }\n\n  /**\n   * Enable profiling.\n   */\n  enable() {\n    this.registerTiming = registerTiming;\n\n    // hack to export (non-prototype) methods\n    this[\n      \"registerStartTiming\"\n    ] = this.registerStartTiming = registerStartTiming;\n    this[\"registerEndTiming\"] = this.registerEndTiming = registerEndTiming;\n  }\n\n  /**\n   * Returns if profiling is enabled or not.\n   */\n  isEnabled(): boolean {\n    return this.registerStartTiming === registerStartTiming;\n  }\n}\n\nfunction noop(): void {}\n\n/**\n * Registers start/end timing of some event.\n * @this {Profile.Profiler}\n * @param name Name of event\n * @param startEnd Either of \"start\" or \"end\"\n * @param timestamp Used as the actual timestamp of the event if specified,\n *     instead of \"now\"\n */\nfunction registerTiming(\n  name: string,\n  startEnd: string,\n  timestamp?: number,\n): void {\n  if (!timestamp) {\n    timestamp = this.performanceInstance.now();\n  }\n  let timestamps = this.timestamps[name];\n  if (!timestamps) {\n    timestamps = this.timestamps[name] = [];\n  }\n  let t;\n  const l = timestamps.length;\n  for (let i = l - 1; i >= 0; i--) {\n    t = timestamps[i];\n    if (t && !t[startEnd]) {\n      break;\n    }\n    t = null;\n  }\n  if (!t) {\n    t = {};\n    timestamps.push(t);\n  }\n  t[startEnd] = timestamp;\n}\n\n/**\n * Registers start timing of some event.\n * @this {Profile.Profiler}\n * @param name Name of event\n * @param timestamp Used as the actual timestamp of the event if specified,\n *     instead of \"now\"\n */\nfunction registerStartTiming(name: string, timestamp?: number): void {\n  this.registerTiming(name, \"start\", timestamp);\n}\n\n/**\n * Registers end timing of some event.\n * @this {Profile.Profiler}\n * @param name Name of event\n * @param timestamp Used as the actual timestamp of the event if specified,\n *     instead of \"now\"\n */\nfunction registerEndTiming(name: string, timestamp?: number): void {\n  this.registerTiming(name, \"end\", timestamp);\n}\nconst fallbackPerformanceInstance = { now: Date.now } as Performance;\nconst performanceInstance = window && window.performance;\nexport const profiler = new Profiler(\n  performanceInstance || fallbackPerformanceInstance,\n);\nprofiler.forceRegisterStartTiming(\"load_vivliostyle\");\n\n/**\n * Pubilc members of the bundled library.\n */\nexport const profile = {\n  profiler: {\n    registerStartTiming: profiler.registerStartTiming,\n    registerEndTiming: profiler.registerEndTiming,\n    printTimings: profiler.printTimings,\n    disable: profiler.disable,\n    enable: profiler.enable,\n  },\n};\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Base - Common utilities.\n */\nimport * as Logging from \"./logging\";\nimport * as Asserts from \"./asserts\";\n\nexport let emptyObj = {};\n\nexport type JSON = any;\n\nexport function jsonToString(json: JSON): string {\n  return JSON.stringify(json);\n}\n\nexport function stringToJSON(str: string): JSON {\n  return JSON.parse(str);\n}\n\nexport function stripFragment(url: string): string {\n  const r = url.match(/^([^#]*)/);\n  if (r) {\n    return r[1];\n  }\n  return url;\n}\n\nexport function stripFragmentAndQuery(url: string): string {\n  const r = url.match(/^([^#?]*)/);\n  if (r) {\n    return r[1];\n  }\n  return url;\n}\n\n/**\n * Base URL relative to which URLs of resources are resolved.\n */\nexport let baseURL = window.location.href;\nexport function setBaseURL(value: string): void {\n  baseURL = value;\n}\n\n/**\n * Base URL relative to which URLs of resources such as validation.txt and\n * user-agent.css are resolved.\n */\nexport let resourceBaseURL = window.location.href;\nexport function setResourceBaseURL(value: string): void {\n  resourceBaseURL = value;\n}\n\n/**\n * @param relURL relative URL\n * @param baseURL base (absolute) URL\n * @return resolved (absolute) URL\n */\nexport function resolveURL(relURL: string, baseURL: string): string {\n  if (baseURL.startsWith(\"data:\")) {\n    return relURL || baseURL;\n  }\n  if (!baseURL || relURL.match(/^\\w{2,}:/)) {\n    if (relURL.toLowerCase().match(\"^javascript:\")) {\n      return \"#\";\n    }\n    if (relURL.match(/^\\w{2,}:\\/\\/[^\\/]+$/)) {\n      relURL = `${relURL}/`;\n    }\n    return relURL;\n  }\n  if (baseURL.match(/^\\w{2,}:\\/\\/[^\\/]+$/)) {\n    baseURL = `${baseURL}/`;\n  }\n  let r: string[];\n  if (relURL.match(/^\\/\\//)) {\n    r = baseURL.match(/^(\\w{2,}:)\\/\\//);\n    if (r) {\n      return r[1] + relURL;\n    }\n    return relURL;\n  }\n  if (relURL.match(/^\\//)) {\n    r = baseURL.match(/^(\\w{2,}:\\/\\/[^\\/]+)\\//);\n    if (r) {\n      return r[1] + relURL;\n    }\n    return relURL;\n  }\n  if (relURL.match(/^\\.(\\/|$)/)) {\n    relURL = relURL.substr(2); // './foo' => 'foo'\n  }\n  baseURL = stripFragmentAndQuery(baseURL);\n  if (relURL.match(/^#/)) {\n    return baseURL + relURL;\n  }\n  let i = baseURL.lastIndexOf(\"/\");\n  if (i < 0) {\n    return relURL;\n  }\n  if (i < baseURL.length - 1) {\n    const j = baseURL.lastIndexOf(\".\");\n    if (j < i) {\n      // Assume the last part without '.' to be a directory name.\n      if (relURL == \"\") {\n        return baseURL;\n      }\n      baseURL += \"/\";\n      i = baseURL.length - 1;\n    }\n  }\n  let url = baseURL.substr(0, i + 1) + relURL;\n  let urlOption = \"\";\n  r = url.match(/^([^?#]*)([?#].*)$/);\n  if (r) {\n    url = r[1];\n    urlOption = r[2];\n  }\n\n  while (true) {\n    i = url.indexOf(\"/../\");\n    if (i <= 0) {\n      break;\n    }\n    const j = url.lastIndexOf(\"/\", i - 1);\n    if (j <= 0) {\n      break;\n    }\n    url = url.substr(0, j) + url.substr(i + 3);\n  }\n  return url.replace(/\\/(\\.\\/)+/g, \"/\") + urlOption;\n}\n\n/**\n * @return converted URL\n */\nexport function convertSpecialURL(url: string): string {\n  let r: RegExpMatchArray;\n  if (\n    (r = /^(https?:)\\/\\/github\\.com\\/([^/]+\\/[^/]+)\\/(blob\\/|tree\\/|raw\\/)?(.*)$/.exec(\n      url,\n    ))\n  ) {\n    // Convert GitHub URL to GitHub raw URL\n    url = `${r[1]}//raw.githubusercontent.com/${r[2]}/${r[3] ? \"\" : \"master/\"}${\n      r[4]\n    }`;\n  } else if (\n    (r = /^(https?:)\\/\\/www\\.aozora\\.gr\\.jp\\/(cards\\/[^/]+\\/files\\/[^/.]+\\.html)$/.exec(\n      url,\n    ))\n  ) {\n    // Convert Aozorabunko (X)HTML URL to GitHub raw URL\n    url = `${r[1]}//raw.githubusercontent.com/aozorabunko/aozorabunko/master/${r[2]}`;\n  } else if (\n    (r = /^(https?:)\\/\\/gist\\.github\\.com\\/([^/]+\\/\\w+)(\\/|$)(raw(\\/|$))?(.*)$/.exec(\n      url,\n    ))\n  ) {\n    // Convert Gist URL to Gist raw URL\n    url = `${r[1]}//gist.githubusercontent.com/${r[2]}/raw/${r[6]}`;\n  } else if (\n    (r = /^(https?:)\\/\\/(?:[^/.]+\\.)?jsbin\\.com\\/(?!(?:blog|help)\\b)(\\w+)((\\/\\d+)?).*$/.exec(\n      url,\n    ))\n  ) {\n    // Convert JS Bin URL to JS Bin output URL\n    url = `${r[1]}//output.jsbin.com/${r[2]}${r[3]}/`;\n  }\n  return url;\n}\n\nexport interface DocumentURLTransformer {\n  transformFragment(fragment: string, baseURL: string): string;\n\n  transformURL(url: string, baseURL: string): string;\n\n  restoreURL(encoded: string): string[];\n}\n\n/**\n * Various namespaces.\n * @enum {string}\n */\nexport enum NS {\n  FB2 = \"http://www.gribuser.ru/xml/fictionbook/2.0\",\n  epub = \"http://www.idpf.org/2007/ops\",\n  EV = \"http://www.w3.org/2001/xml-events\",\n  MATHML = \"http://www.w3.org/1998/Math/MathML\",\n  XML = \"http://www.w3.org/XML/1998/namespace\",\n  XHTML = \"http://www.w3.org/1999/xhtml\",\n  XLINK = \"http://www.w3.org/1999/xlink\",\n  SHADOW = \"http://www.pyroxy.com/ns/shadow\",\n  SVG = \"http://www.w3.org/2000/svg\",\n  DC = \"http://purl.org/dc/elements/1.1/\",\n  NCX = \"http://www.daisy.org/z3986/2005/ncx/\",\n  SSE = \"http://example.com/sse\", // temporary dummy namespace\n}\n\n/**\n * @param name parameter name\n * @param opt_url URL; window.location.href is used if not provided\n * @return parameter value\n */\nexport function getURLParam(name: string, opt_url?: string): string | null {\n  const rg = new RegExp(`#(.*&)?${escapeRegExp(name)}=([^#&]*)`);\n  const url = opt_url || window.location.href;\n  const r = url.match(rg);\n  if (r) {\n    return r[2];\n  }\n  return null;\n}\n\n/**\n * @param name parameter name\n * @param value parameter value\n * @return new url\n */\nexport function setURLParam(url: string, name: string, value: string): string {\n  const rg = new RegExp(`#(.*&)?${escapeRegExp(name)}=([^#&]*)`);\n  const r = url.match(rg);\n  if (r) {\n    const length = r[2].length;\n    const index = r.index + r[0].length - length;\n    return url.substr(0, index) + value + url.substr(index + length);\n  }\n  if (!url.match(/#/)) {\n    return `${url}#${name}=${value}`;\n  } else {\n    return `${url}&${name}=${value}`;\n  }\n}\n\n/**\n * @return ?string\n */\nexport function asString(v: any): any {\n  if (v == null) {\n    return v;\n  }\n  return v.toString();\n}\n\nexport interface Comparable {\n  /**\n   * @return -1 when this less then other, 0 when this equals other\n   */\n  compare(other: Comparable): number;\n}\n\n/**\n * A priority queue.\n */\nexport class PriorityQueue {\n  queue: Comparable[] = [null];\n\n  length(): number {\n    return this.queue.length - 1;\n  }\n\n  add(item: Comparable): void {\n    let index = this.queue.length;\n    while (index > 1) {\n      const parentIndex = Math.floor(index / 2);\n      const parent = this.queue[parentIndex];\n      if (parent.compare(item) > 0) {\n        this.queue[index] = item;\n        return;\n      }\n      this.queue[index] = parent;\n      index = parentIndex;\n    }\n    this.queue[1] = item;\n  }\n\n  /**\n   * @return highest priority Comparable.\n   */\n  peek(): Comparable {\n    return this.queue[1];\n  }\n\n  /**\n   * Remove the highest-priority item from the queue.\n   * @return removed item.\n   */\n  remove(): Comparable {\n    const result = this.queue[1] as Comparable;\n    const curr = this.queue.pop() as Comparable;\n    const size = this.queue.length;\n    if (size > 1) {\n      let index = 1;\n      while (true) {\n        let childIndex = index * 2;\n        if (childIndex >= size) {\n          break;\n        }\n        if (this.queue[childIndex].compare(curr) > 0) {\n          if (\n            childIndex + 1 < size &&\n            this.queue[childIndex + 1].compare(\n              this.queue[childIndex] as Comparable,\n            ) > 0\n          ) {\n            childIndex++;\n          }\n        } else if (\n          childIndex + 1 < size &&\n          this.queue[childIndex + 1].compare(curr) > 0\n        ) {\n          childIndex++;\n        } else {\n          break;\n        }\n        this.queue[index] = this.queue[childIndex];\n        index = childIndex;\n      }\n      this.queue[index] = curr;\n    }\n    return result;\n  }\n}\n\n/**\n * @param prefix Prefix (containing leading and trailing hyphens)\n * @param cssPropName CSS property name\n * @return JavaScript property name\n */\nexport function cssToJSProp(prefix: string, cssPropName: string): string {\n  if (prefix) {\n    cssPropName = `-${cssPropName}`;\n    prefix = prefix.replace(/-/g, \"\");\n    if (prefix === \"moz\") {\n      prefix = \"Moz\";\n    }\n  }\n  return (\n    prefix +\n    cssPropName.replace(/-[a-z]/g, (txt) => txt.substr(1).toUpperCase())\n  );\n}\n\nexport const knownPrefixes = [\"\", \"-webkit-\", \"-moz-\", \"-ms-\", \"-o-\", \"-epub-\"];\n\nexport const propNameMap = {};\n\nexport function checkIfPropertySupported(\n  prefix: string,\n  prop: string,\n): boolean {\n  // Special case\n  if (prop === \"writing-mode\") {\n    const probe = document.createElement(\"span\");\n    if (prefix === \"-ms-\") {\n      probe.style.setProperty(prefix + prop, \"tb-rl\");\n      return probe.style[\"writing-mode\"] === \"tb-rl\";\n    } else {\n      probe.style.setProperty(prefix + prop, \"vertical-rl\");\n      return probe.style[prefix + prop] === \"vertical-rl\";\n    }\n  } else {\n    const style = document.documentElement.style;\n    return typeof style[cssToJSProp(prefix, prop)] === \"string\";\n  }\n}\n\nexport function getPrefixedPropertyNames(prop: string): string[] | null {\n  let prefixed = propNameMap[prop];\n  if (prefixed || prefixed === null) {\n    // null means the browser does not support the property\n    return prefixed;\n  }\n  switch (prop) {\n    case \"text-combine-upright\":\n      // Special case for Safari\n      if (\n        checkIfPropertySupported(\"-webkit-\", \"text-combine\") &&\n        !checkIfPropertySupported(\"\", \"text-combine-upright\")\n      ) {\n        propNameMap[prop] = [\"-webkit-text-combine\"];\n        return [\"-webkit-text-combine\"];\n      }\n      break;\n    case \"writing-mode\":\n      // Special case: prefer '-ms-writing-mode' to 'writing-mode'\n      if (checkIfPropertySupported(\"-ms-\", \"writing-mode\")) {\n        propNameMap[prop] = [\"-ms-writing-mode\"];\n        return [\"-ms-writing-mode\"];\n      }\n      break;\n    case \"filter\":\n      // Special case: prefer '-webkit-filter' to 'filter'\n      if (checkIfPropertySupported(\"-webkit-\", \"filter\")) {\n        propNameMap[prop] = [\"-webkit-filter\"];\n        return [\"-webkit-filter\"];\n      }\n      break;\n    case \"clip-path\":\n      // Special case for chrome.\n      if (checkIfPropertySupported(\"-webkit-\", \"clip-path\")) {\n        return (propNameMap[prop] = [\"-webkit-clip-path\", \"clip-path\"]);\n      }\n      break;\n    case \"margin-inline-start\":\n      if (checkIfPropertySupported(\"-webkit-\", \"margin-start\")) {\n        propNameMap[prop] = [\"-webkit-margin-start\"];\n        return [\"-webkit-margin-start\"];\n      }\n      break;\n    case \"margin-inline-end\":\n      if (checkIfPropertySupported(\"-webkit-\", \"margin-end\")) {\n        propNameMap[prop] = [\"-webkit-margin-end\"];\n        return [\"-webkit-margin-end\"];\n      }\n      break;\n    case \"padding-inline-start\":\n      if (checkIfPropertySupported(\"-webkit-\", \"padding-start\")) {\n        propNameMap[prop] = [\"-webkit-padding-start\"];\n        return [\"-webkit-padding-start\"];\n      }\n      break;\n    case \"padding-inline-end\":\n      if (checkIfPropertySupported(\"-webkit-\", \"padding-end\")) {\n        propNameMap[prop] = [\"-webkit-padding-end\"];\n        return [\"-webkit-padding-end\"];\n      }\n      break;\n  }\n  for (const prefix of knownPrefixes) {\n    if (checkIfPropertySupported(prefix, prop)) {\n      prefixed = prefix + prop;\n      propNameMap[prop] = [prefixed];\n      return [prefixed];\n    }\n  }\n\n  // Not supported by the browser\n  Logging.logger.warn(\"Property not supported by the browser: \", prop);\n  propNameMap[prop] = null;\n  return null;\n}\n\nexport function setCSSProperty(\n  elem: Element,\n  prop: string,\n  value: string,\n): void {\n  try {\n    const prefixedPropertyNames = getPrefixedPropertyNames(prop);\n    if (!prefixedPropertyNames) {\n      return;\n    }\n    prefixedPropertyNames.forEach((prefixed) => {\n      if (prefixed === \"-ms-writing-mode\") {\n        switch (value) {\n          case \"horizontal-tb\":\n            value = \"lr-tb\";\n            break;\n          case \"vertical-rl\":\n            value = \"tb-rl\";\n            break;\n          case \"vertical-lr\":\n            value = \"tb-lr\";\n            break;\n        }\n      } else if (prefixed === \"-webkit-text-combine\") {\n        switch (value) {\n          case \"all\":\n            value = \"horizontal\";\n            break;\n        }\n      }\n      if (elem && (elem as HTMLElement).style) {\n        (elem as HTMLElement).style.setProperty(prefixed, value);\n      }\n    });\n  } catch (err) {\n    Logging.logger.warn(err);\n  }\n}\n\nexport function getCSSProperty(\n  elem: Element,\n  prop: string,\n  opt_value?: string,\n): string {\n  try {\n    const propertyNames = propNameMap[prop];\n    return (elem as HTMLElement).style.getPropertyValue(\n      propertyNames ? propertyNames[0] : prop,\n    );\n  } catch (err) {}\n  return opt_value || \"\";\n}\n\nexport function getLangAttribute(element: Element): string {\n  let lang = element.getAttributeNS(NS.XML, \"lang\");\n  if (!lang && element.namespaceURI == NS.XHTML) {\n    lang = element.getAttribute(\"lang\");\n  }\n  return lang;\n}\n\nexport class StringBuffer {\n  list: string[] = [];\n\n  append(str: string): StringBuffer {\n    this.list.push(str);\n    return this;\n  }\n\n  clear(): void {\n    this.list = [];\n  }\n\n  /**\n   * @override\n   */\n  toString(): string {\n    const str = this.list.join(\"\");\n    this.list = [str];\n    return str;\n  }\n}\n\nexport function escapeChar(str: string): string {\n  // not called for surrogate pairs, no need to worry about them\n  return `\\\\${str.charCodeAt(0).toString(16)} `;\n}\n\nexport function escapeCSSIdent(name: string): string {\n  return name.replace(/[^-_a-zA-Z0-9\\u0080-\\uFFFF]/g, escapeChar);\n}\n\nexport function escapeCSSStr(str: string): string {\n  return str.replace(/[\\u0000-\\u001F\"\\\\]/g, escapeChar);\n}\n\nexport function lightURLEncode(str: string): string {\n  return str.replace(/[\\s+&?=#\\u007F-\\uFFFF]+/g, encodeURIComponent);\n}\n\nexport function isLetter(ch: string): boolean {\n  return !!ch.match(\n    /^[a-zA-Z\\u009E\\u009F\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u024F\\u037B-\\u037D\\u0386\\u0388-\\u0482\\u048A-\\u0527]$/,\n  );\n}\n\nexport function escapeCharToHex(str: string, prefix?: string): string {\n  prefix = typeof prefix === \"string\" ? prefix : \"\\\\u\";\n  return prefix + (65536 | str.charCodeAt(0)).toString(16).substr(1);\n}\n\nexport function escapeNameStrToHex(str: string, prefix?: string): string {\n  function escapeChar(s) {\n    return escapeCharToHex(s, prefix);\n  }\n  return str.replace(/[^-a-zA-Z0-9_]/g, escapeChar);\n}\n\nexport function escapeRegExp(str: string): string {\n  return escapeNameStrToHex(str);\n}\n\nexport function unescapeCharFromHex(str: string, prefix?: string): string {\n  prefix = typeof prefix === \"string\" ? prefix : \"\\\\u\";\n  if (str.indexOf(prefix) === 0) {\n    return String.fromCharCode(parseInt(str.substring(prefix.length), 16));\n  } else {\n    return str;\n  }\n}\n\nexport function unescapeStrFromHex(str: string, prefix?: string): string {\n  prefix = typeof prefix === \"string\" ? prefix : \"\\\\u\";\n\n  function unescapeChar(s) {\n    return unescapeCharFromHex(s, prefix);\n  }\n  const regexp = new RegExp(`${escapeRegExp(prefix)}[0-9a-fA-F]{4}`, \"g\");\n  return str.replace(regexp, unescapeChar);\n}\n\n/**\n * Function good is defined for ints from 0 to high-1. It is such that for\n * each i between 1 and high-1 !good(i-1) || good(i) is true. In other words,\n * it goes like false ... false true ... true.\n * Find i such that (i == 0 || !good(i-1)) && (i == h || good(i))\n * In other words, good(i) is the \"first\" good = true.\n */\nexport function binarySearch(\n  high: number,\n  good: (p1: number) => boolean,\n): number {\n  let l = 0;\n  let h = high;\n  while (true) {\n    Asserts.assert(l <= h);\n    Asserts.assert(l == 0 || !good(l - 1));\n    Asserts.assert(h == high || good(h));\n    if (l == h) {\n      return l;\n    }\n    const m = (l + h) >> 1;\n    if (good(m)) {\n      h = m;\n    } else {\n      l = m + 1;\n    }\n  }\n}\n\n/**\n * Function to sort numbers low to high\n */\nexport function numberCompare(a: number, b: number): number {\n  return a - b;\n}\n\nexport const base64Chars =\n  \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\";\n\nexport function appendBase64(sb: StringBuffer, data: string): void {\n  const length = data.length;\n  const length3 = Math.floor(length / 3) * 3;\n  for (let i = 0; i < length3; i += 3) {\n    const c1 = data.charCodeAt(i) & 255;\n    const c2 = data.charCodeAt(i + 1) & 255;\n    const c3 = data.charCodeAt(i + 2) & 255;\n    sb.append(base64Chars.charAt(c1 >> 2));\n    sb.append(base64Chars.charAt(((c1 << 4) | (c2 >> 4)) & 63));\n    sb.append(base64Chars.charAt(((c2 << 2) | (c3 >> 6)) & 63));\n    sb.append(base64Chars.charAt(c3 & 63));\n  }\n  switch (length - length3) {\n    case 1: {\n      const p1 = data.charCodeAt(length3) & 255;\n      sb.append(base64Chars.charAt(p1 >> 2));\n      sb.append(base64Chars.charAt((p1 << 4) & 63));\n      sb.append(\"==\");\n      break;\n    }\n    case 2: {\n      const q1 = data.charCodeAt(length3) & 255;\n      const q2 = data.charCodeAt(length3 + 1) & 255;\n      sb.append(base64Chars.charAt(q1 >> 2));\n      sb.append(base64Chars.charAt(((q1 << 4) | (q2 >> 4)) & 63));\n      sb.append(base64Chars.charAt((q2 << 2) & 63));\n      sb.append(\"=\");\n      break;\n    }\n  }\n}\n\n/**\n * Index array using key function. First encountered item wins on collision.\n * Elements with empty and null keys are dropped.\n */\nexport function indexArray<T>(\n  arr: T[],\n  key: (p1: T) => string | null,\n): { [key: string]: T } {\n  const map: { [key: string]: T } = {};\n  for (const v of arr) {\n    const k: string | null = key(v);\n    if (k && !map[k]) {\n      map[k] = v;\n    }\n  }\n  return map;\n}\n\n/**\n * Convert array of strings to an object with the values in the array set to\n * true.\n */\nexport function arrayToSet(arr: string[]): { [key: string]: boolean } {\n  const set = {};\n  for (let i = 0; i < arr.length; i++) {\n    set[arr[i]] = true;\n  }\n  return set;\n}\n\n/**\n * Index array using key function. Repeated indices are all combined into\n * arrays. Elements with empty and null keys are dropped. Ordering of the\n * elements in arrays is preserved.\n */\nexport function multiIndexArray<T>(\n  arr: T[],\n  key: (p1: T) => string | null,\n): { [key: string]: T[] } {\n  const map: { [key: string]: T[] } = {};\n  for (const v of arr) {\n    const k = key(v);\n    if (k) {\n      if (map[k]) {\n        map[k].push(v);\n      } else {\n        map[k] = [v];\n      }\n    }\n  }\n  return map;\n}\n\n/**\n * Apply function to each value of the object\n * @param fn second parameter is the key\n */\nexport function mapObj<P, R>(\n  obj: { [key: string]: P },\n  fn: (p1: P, p2: string) => R,\n): { [key: string]: R } {\n  const res: { [key: string]: R } = {};\n  for (const n in obj) {\n    res[n] = fn(obj[n], n);\n  }\n  return res;\n}\n\nexport function mapSize(obj: object): number {\n  let n = 0;\n  for (const key in obj) {\n    n++;\n  }\n  return n;\n}\n\nexport type Event = {\n  type: string;\n  target?;\n  currentTarget?;\n  preventDefault?;\n  newPage?;\n  anchorElement?;\n  href?;\n  content?;\n};\n\nexport type EventListener = (p1: Event) => void;\n\n/**\n * Extemely simple-minded EventTarget implementation. Consider using\n * goog.events.EventTarget if you are using Closure library.\n */\nexport class SimpleEventTarget {\n  listeners: { [key: string]: EventListener[] } = {};\n\n  dispatchEvent(evt: Event): void {\n    const list = this.listeners[evt.type];\n    if (list) {\n      evt.target = this;\n      evt.currentTarget = this;\n      for (let i = 0; i < list.length; i++) {\n        list[i](evt);\n      }\n    }\n  }\n\n  addEventListener(\n    type: string,\n    listener: EventListener,\n    capture?: boolean,\n  ): void {\n    if (capture) {\n      return;\n    }\n    const list = this.listeners[type];\n    if (list) {\n      list.push(listener);\n    } else {\n      this.listeners[type] = [listener];\n    }\n  }\n\n  removeEventListener(\n    type: string,\n    listener: EventListener,\n    capture?: boolean,\n  ): void {\n    if (capture) {\n      return;\n    }\n    const list = this.listeners[type];\n    if (list) {\n      const index = list.indexOf(listener);\n      if (index >= 0) {\n        list.splice(index, 1);\n      }\n    }\n  }\n}\nexport type EventTarget = SimpleEventTarget;\n\nexport let hasLShapeFloatBug: boolean | null = null;\n\n/**\n * Check if there is a bug with L-shape floats overlapping text.\n */\nexport function checkLShapeFloatBug(body: HTMLElement): boolean {\n  if (hasLShapeFloatBug == null) {\n    const doc = body.ownerDocument;\n    const container = doc.createElement(\"div\") as HTMLElement;\n    container.style.position = \"absolute\";\n    container.style.top = \"0px\";\n    container.style.left = \"0px\";\n    container.style.width = \"100px\";\n    container.style.height = \"100px\";\n    container.style.overflow = \"hidden\";\n    container.style.lineHeight = \"16px\";\n    container.style.fontSize = \"16px\";\n    body.appendChild(container);\n    const f1 = doc.createElement(\"div\") as HTMLElement;\n    f1.style.width = \"0px\";\n    f1.style.height = \"14px\";\n    f1.style.cssFloat = \"left\";\n    container.appendChild(f1);\n    const f2 = doc.createElement(\"div\") as HTMLElement;\n    f2.style.width = \"50px\";\n    f2.style.height = \"50px\";\n    f2.style.cssFloat = \"left\";\n    f2.style.clear = \"left\";\n    container.appendChild(f2);\n    const t = doc.createTextNode(\"a a a a a a a a a a a a a a a a\");\n    container.appendChild(t);\n    const range = doc.createRange();\n    range.setStart(t, 0);\n    range.setEnd(t, 1);\n    const leftEdge = range.getBoundingClientRect().left;\n    hasLShapeFloatBug = leftEdge < 40;\n    body.removeChild(container);\n  }\n  return hasLShapeFloatBug;\n}\n\nexport let hasVerticalBBoxBug: boolean | null = null;\n\n/**\n * Check if there is a bug with the bounding boxes of vertical text characters.\n * Though method used to be used check Chrome bug, it seems that the bug has\n * been already fixed:\n *   https://bugs.chromium.org/p/chromium/issues/detail?id=297808\n * We now use this method to check Firefox bug:\n *   https://bugzilla.mozilla.org/show_bug.cgi?id=1159309\n */\nexport function checkVerticalBBoxBug(body: HTMLElement): boolean {\n  if (hasVerticalBBoxBug == null) {\n    const doc = body.ownerDocument;\n    const container = doc.createElement(\"div\") as HTMLElement;\n    container.style.position = \"absolute\";\n    container.style.top = \"0px\";\n    container.style.left = \"0px\";\n    container.style.width = \"100px\";\n    container.style.height = \"100px\";\n    container.style.overflow = \"hidden\";\n    container.style.lineHeight = \"16px\";\n    container.style.fontSize = \"16px\";\n    setCSSProperty(container, \"writing-mode\", \"vertical-rl\");\n    body.appendChild(container);\n    const t = doc.createTextNode(\"a a a a a a a a a a a a a a a a\");\n    container.appendChild(t);\n    const range = doc.createRange();\n    range.setStart(t, 0);\n    range.setEnd(t, 1);\n    const box = range.getBoundingClientRect();\n    hasVerticalBBoxBug = box.right - box.left < 10;\n    body.removeChild(container);\n  }\n  return hasVerticalBBoxBug;\n}\n\nexport let hasInlineBlockJustificationBug: boolean | null = null;\n\nexport function checkInlineBlockJustificationBug(body: HTMLElement): boolean {\n  if (hasInlineBlockJustificationBug === null) {\n    const doc = body.ownerDocument;\n    const container = doc.createElement(\"div\") as HTMLElement;\n    container.style.position = \"absolute\";\n    container.style.top = \"0px\";\n    container.style.left = \"0px\";\n    container.style.width = \"30px\";\n    container.style.height = \"100px\";\n    container.style.lineHeight = \"16px\";\n    container.style.fontSize = \"16px\";\n    container.style.textAlign = \"justify\";\n    body.appendChild(container);\n    const t = doc.createTextNode(\"a | \");\n    container.appendChild(t);\n    const inlineBlock = doc.createElement(\"span\");\n    inlineBlock.style.display = \"inline-block\";\n    inlineBlock.style.width = \"30px\";\n    container.appendChild(inlineBlock);\n    const range = doc.createRange();\n    range.setStart(t, 0);\n    range.setEnd(t, 3);\n    const box = range.getBoundingClientRect();\n    hasInlineBlockJustificationBug = box.right < 27;\n    body.removeChild(container);\n  }\n  return hasInlineBlockJustificationBug;\n}\n\nexport let hasSoftWrapOpportunityAfterHyphenBug: boolean | null = null;\n\nexport function checkSoftWrapOpportunityAfterHyphenBug(\n  body: HTMLElement,\n): boolean {\n  if (hasSoftWrapOpportunityAfterHyphenBug === null) {\n    const doc = body.ownerDocument;\n    const container = doc.createElement(\"div\") as HTMLElement;\n    container.style.position = \"absolute\";\n    container.style.top = \"0px\";\n    container.style.left = \"0px\";\n    container.style.width = \"40px\";\n    container.style.height = \"100px\";\n    container.style.lineHeight = \"16px\";\n    container.style.fontSize = \"16px\";\n    container.style.textAlign = \"justify\";\n    body.appendChild(container);\n    const t = doc.createTextNode(\"a a-\");\n    container.appendChild(t);\n    const inlineBlock = doc.createElement(\"span\");\n    inlineBlock.style.display = \"inline-block\";\n    inlineBlock.style.width = \"40px\";\n    container.appendChild(inlineBlock);\n    const range = doc.createRange();\n    range.setStart(t, 2);\n    range.setEnd(t, 4);\n    const box = range.getBoundingClientRect();\n    hasSoftWrapOpportunityAfterHyphenBug = box.right < 37;\n    body.removeChild(container);\n  }\n  return hasSoftWrapOpportunityAfterHyphenBug;\n}\n\nexport let hasSoftWrapOpportunityByWbrBug: boolean | null = null;\n\nexport function checkSoftWrapOpportunityByWbrBug(body: HTMLElement): boolean {\n  if (hasSoftWrapOpportunityByWbrBug === null) {\n    const doc = body.ownerDocument;\n    const container = doc.createElement(\"div\") as HTMLElement;\n    container.style.position = \"absolute\";\n    container.style.top = \"0px\";\n    container.style.left = \"0px\";\n    container.style.width = \"40px\";\n    container.style.height = \"100px\";\n    container.style.lineHeight = \"16px\";\n    container.style.fontSize = \"16px\";\n    container.style.textAlign = \"justify\";\n    body.appendChild(container);\n    const t = doc.createTextNode(\"a a-\");\n    container.appendChild(t);\n    container.appendChild(doc.createElement(\"wbr\"));\n    const inlineBlock = doc.createElement(\"span\");\n    inlineBlock.style.display = \"inline-block\";\n    inlineBlock.style.width = \"40px\";\n    container.appendChild(inlineBlock);\n    const range = doc.createRange();\n    range.setStart(t, 2);\n    range.setEnd(t, 4);\n    const box = range.getBoundingClientRect();\n    hasSoftWrapOpportunityByWbrBug = box.right < 37;\n    body.removeChild(container);\n  }\n  return hasSoftWrapOpportunityByWbrBug;\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Cfi - Support for EPUB Canonical Fragment Identifiers.\n */\nimport * as Base from \"./base\";\n\nexport type Position = {\n  node: Node;\n  offset: number;\n  after: boolean;\n  sideBias: string | null;\n  ref: Fragment;\n};\n\nexport function getId(node: Node): string | null {\n  if (node.nodeType == 1) {\n    const idtxt = (node as Element).getAttribute(\"id\");\n    if (idtxt && idtxt.match(/^[-a-zA-Z_0-9.\\u007F-\\uFFFF]+$/)) {\n      return idtxt;\n    }\n  }\n  return null;\n}\n\nexport function escapeChar(ch: string): string {\n  return `^${ch}`;\n}\n\nexport function escape(str: string): string {\n  return str.replace(/[\\[\\]\\(\\),=;^]/g, escapeChar);\n}\n\nexport function unescapeChar(str: string): string {\n  return str.substr(1);\n}\n\nexport function unescape(str: string): string {\n  if (!str) {\n    return str;\n  }\n  return str.replace(/\\^[\\[\\]\\(\\),=;^]/g, unescapeChar);\n}\n\nexport function parseExtVal(extstr: string): string | string[] {\n  const result = [];\n  do {\n    const r = extstr.match(/^(\\^,|[^,])*/);\n    const p = unescape(r[0]);\n    extstr = extstr.substr(r[0].length + 1);\n    if (!extstr && !result.length) {\n      return p;\n    }\n    result.push(p);\n  } while (extstr);\n  return result;\n}\n\nexport function parseExt(extstr: string): { [key: string]: string | string[] } {\n  const ext = {};\n  while (extstr) {\n    const r = extstr.match(/^;([^;=]+)=(([^;]|\\^;)*)/);\n    if (!r) {\n      return ext;\n    }\n    ext[r[1]] = parseExtVal(r[2]);\n    extstr = extstr.substr(r[0].length);\n  }\n  return ext;\n}\n\nexport interface Step {\n  appendTo(sb: Base.StringBuffer): void;\n\n  applyTo(pos: Position): boolean;\n}\n\nexport class RefStep implements Step {\n  appendTo(sb: Base.StringBuffer) {\n    sb.append(\"!\");\n  }\n\n  /**\n   * @override\n   */\n  applyTo(pos: Position): boolean {\n    return false;\n  }\n}\n\nexport class ChildStep implements Step {\n  constructor(\n    public readonly index: number,\n    public readonly id: string | null,\n    public readonly sideBias: string | null,\n  ) {}\n\n  /**\n   * @override\n   */\n  appendTo(sb: Base.StringBuffer): void {\n    sb.append(\"/\");\n    sb.append(this.index.toString());\n    if (this.id || this.sideBias) {\n      sb.append(\"[\");\n      if (this.id) {\n        sb.append(this.id);\n      }\n      if (this.sideBias) {\n        sb.append(\";s=\");\n        sb.append(this.sideBias);\n      }\n      sb.append(\"]\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  applyTo(pos: Position): boolean {\n    if (pos.node.nodeType != 1) {\n      throw new Error(\"E_CFI_NOT_ELEMENT\");\n    }\n    const elem = pos.node as Element;\n    const childElements = elem.children;\n    const childElementCount = childElements.length;\n    let child: Node;\n    const childIndex = Math.floor(this.index / 2) - 1;\n    if (childIndex < 0 || childElementCount == 0) {\n      child = elem.firstChild;\n      pos.node = child || elem;\n    } else {\n      child = childElements[Math.min(childIndex, childElementCount - 1)];\n      if (this.index & 1) {\n        const next = child.nextSibling;\n        if (!next || next.nodeType == 1) {\n          pos.after = true;\n        } else {\n          child = next;\n        }\n      }\n      pos.node = child;\n    }\n    if (this.id && (pos.after || this.id != getId(pos.node))) {\n      throw new Error(\"E_CFI_ID_MISMATCH\");\n    }\n    pos.sideBias = this.sideBias;\n    return true;\n  }\n}\n\nexport class OffsetStep implements Step {\n  constructor(\n    public readonly offset: number,\n    public readonly textBefore: string | null,\n    public readonly textAfter: string | null,\n    public readonly sideBias: string | null,\n  ) {}\n\n  applyTo(pos: Position): boolean {\n    if (this.offset > 0 && !pos.after) {\n      let offset = this.offset;\n      let node = pos.node;\n      while (true) {\n        const nodeType = node.nodeType;\n        if (nodeType == 1) {\n          break;\n        }\n        const next = node.nextSibling;\n        if (3 <= nodeType && nodeType <= 5) {\n          const textLength = node.textContent.length;\n          if (offset <= textLength) {\n            break;\n          }\n          if (!next) {\n            offset = textLength;\n            break;\n          }\n          offset -= textLength;\n        }\n        if (!next) {\n          offset = 0;\n          break;\n        }\n        node = next;\n      }\n      pos.node = node;\n      pos.offset = offset;\n    }\n    pos.sideBias = this.sideBias;\n    return true;\n  }\n\n  /**\n   * @override\n   */\n  appendTo(sb: Base.StringBuffer): void {\n    sb.append(\":\");\n    sb.append(this.offset.toString());\n    if (this.textBefore || this.textAfter || this.sideBias) {\n      sb.append(\"[\");\n      if (this.textBefore || this.textAfter) {\n        if (this.textBefore) {\n          sb.append(escape(this.textBefore));\n        }\n        sb.append(\",\");\n        if (this.textAfter) {\n          sb.append(escape(this.textAfter));\n        }\n      }\n      if (this.sideBias) {\n        sb.append(\";s=\");\n        sb.append(this.sideBias);\n      }\n      sb.append(\"]\");\n    }\n  }\n}\n\nexport class Fragment {\n  steps: Step[] = null;\n\n  fromString(fragstr: string): void {\n    let r = fragstr.match(/^#?epubcfi\\((.*)\\)$/);\n    if (!r) {\n      throw new Error(\"E_CFI_NOT_CFI\");\n    }\n    const str = r[1];\n    let i = 0;\n    const steps = [];\n    while (true) {\n      let ext: {\n        [key: string]: string | string[];\n      };\n      switch (str.charAt(i)) {\n        case \"/\": {\n          i++;\n          r = str\n            .substr(i)\n            .match(\n              /^(0|[1-9][0-9]*)(\\[([-a-zA-Z_0-9.\\u007F-\\uFFFF]+)(;([^\\]]|\\^\\])*)?\\])?/,\n            );\n          if (!r) {\n            throw new Error(\"E_CFI_NUMBER_EXPECTED\");\n          }\n          i += r[0].length;\n          const index = parseInt(r[1], 10);\n          const id = r[3];\n          ext = parseExt(r[4]);\n          steps.push(new ChildStep(index, id, Base.asString(ext[\"s\"])));\n          break;\n        }\n        case \":\": {\n          i++;\n          r = str\n            .substr(i)\n            .match(\n              /^(0|[1-9][0-9]*)(\\[((([^\\];,]|\\^[\\];,])*)(,(([^\\];,]|\\^[\\];,])*))?)(;([^]]|\\^\\])*)?\\])?/,\n            );\n          if (!r) {\n            throw new Error(\"E_CFI_NUMBER_EXPECTED\");\n          }\n          i += r[0].length;\n          const offset = parseInt(r[1], 10);\n          let textBefore = r[4];\n          if (textBefore) {\n            textBefore = unescape(textBefore);\n          }\n          let textAfter = r[7];\n          if (textAfter) {\n            textAfter = unescape(textAfter);\n          }\n          ext = parseExt(r[10]);\n          steps.push(\n            new OffsetStep(\n              offset,\n              textBefore,\n              textAfter,\n              Base.asString(ext[\"s\"]),\n            ),\n          );\n          break;\n        }\n        case \"!\":\n          i++;\n          steps.push(new RefStep());\n          break;\n        case \"~\":\n        case \"@\":\n\n        // Time/space terminus; only useful for highlights/selections which are\n        // not yet supported, skip for now. fall through\n        case \"\":\n          this.steps = steps;\n          return;\n        default:\n          throw new Error(\"E_CFI_PARSE_ERROR\");\n      }\n    }\n  }\n\n  navigate(doc: Document): Position {\n    const pos = {\n      node: doc.documentElement,\n      offset: 0,\n      after: false,\n      sideBias: null,\n      ref: null,\n    };\n    for (let i = 0; i < this.steps.length; i++) {\n      if (!this.steps[i].applyTo(pos)) {\n        pos.ref = new Fragment();\n        pos.ref.steps = this.steps.slice(i + 1);\n        break;\n      }\n    }\n    return pos;\n  }\n\n  trim(text: string, after: boolean): string {\n    return text\n      .replace(/\\s+/g, \" \")\n      .match(\n        after\n          ? /^[ -\\uD7FF\\uE000-\\uFFFF]{0,8}/\n          : /[ -\\uD7FF\\uE000-\\uFFFF]{0,8}$/,\n      )[0]\n      .replace(/^\\s/, \"\")\n      .replace(/\\s$/, \"\");\n  }\n\n  /**\n   * Initialize from a node and an offset.\n   */\n  prependPathFromNode(\n    node: Node,\n    offset: number,\n    after: boolean,\n    sideBias: string | null,\n  ) {\n    const steps = [];\n    let parent = node.parentNode;\n    let textBefore = \"\";\n    let textAfter = \"\";\n    while (node) {\n      switch (node.nodeType) {\n        case 3: // Text nodes\n        case 4:\n        case 5: {\n          const text = node.textContent;\n          const textLength = text.length;\n          if (after) {\n            offset += textLength;\n            if (!textBefore) {\n              textBefore = text;\n            }\n          } else {\n            if (offset > textLength) {\n              offset = textLength;\n            }\n            after = true;\n            textBefore = text.substr(0, offset);\n            textAfter = text.substr(offset);\n          }\n          node = node.previousSibling;\n          continue;\n        }\n        case 8: // Comment Node\n          node = node.previousSibling;\n          continue;\n      }\n      break;\n    }\n    if (offset > 0 || textBefore || textAfter) {\n      textBefore = this.trim(textBefore, false);\n      textAfter = this.trim(textAfter, true);\n      steps.push(new OffsetStep(offset, textBefore, textAfter, sideBias));\n      sideBias = null;\n    }\n    while (parent) {\n      if (!parent || parent.nodeType == 9) {\n        break;\n      }\n      const id = after ? null : getId(node);\n      let index = after ? 1 : 0;\n      while (node) {\n        if (node.nodeType == 1) {\n          index += 2;\n        }\n        node = node.previousSibling;\n      }\n      steps.push(new ChildStep(index, id, sideBias));\n      sideBias = null;\n      node = parent;\n      parent = parent.parentNode;\n      after = false;\n    }\n    steps.reverse();\n    if (this.steps) {\n      steps.push(new RefStep());\n      this.steps = steps.concat(this.steps);\n    } else {\n      this.steps = steps;\n    }\n  }\n\n  toString(): string {\n    if (!this.steps) {\n      return \"\";\n    }\n    const sb = new Base.StringBuffer();\n    sb.append(\"epubcfi(\");\n    for (let i = 0; i < this.steps.length; i++) {\n      this.steps[i].appendTo(sb);\n    }\n    sb.append(\")\");\n    return sb.toString();\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Exprs - `-epubx-expr` Adaptive Layout expressions.\n */\nimport * as Base from \"./base\";\n\nexport type Preferences = {\n  fontFamily: string;\n  lineHeight: number;\n  margin: number;\n  hyphenate: boolean;\n  columnWidth: number;\n  horizontal: boolean;\n  nightMode: boolean;\n  spreadView: boolean;\n  pageBorder: number;\n  enabledMediaTypes: { [key: string]: boolean };\n  defaultPaperSize?: { [key: string]: number };\n};\n\nexport function defaultPreferences(): Preferences {\n  return {\n    fontFamily: \"serif\",\n    lineHeight: 1.25,\n    margin: 8,\n    hyphenate: false,\n    columnWidth: 25,\n    horizontal: false,\n    nightMode: false,\n    spreadView: false,\n    pageBorder: 1,\n    enabledMediaTypes: { vivliostyle: true, print: true },\n    defaultPaperSize: undefined,\n  };\n}\n\nexport function clonePreferences(pref: Preferences): Preferences {\n  return {\n    fontFamily: pref.fontFamily,\n    lineHeight: pref.lineHeight,\n    margin: pref.margin,\n    hyphenate: pref.hyphenate,\n    columnWidth: pref.columnWidth,\n    horizontal: pref.horizontal,\n    nightMode: pref.nightMode,\n    spreadView: pref.spreadView,\n    pageBorder: pref.pageBorder,\n    enabledMediaTypes: Object.assign({}, pref.enabledMediaTypes),\n    defaultPaperSize: pref.defaultPaperSize\n      ? Object.assign({}, pref.defaultPaperSize)\n      : undefined,\n  };\n}\n\nexport const defaultPreferencesInstance = defaultPreferences();\n\ninterface Pending {}\ntype Special = Pending;\n\n/**\n * Special marker value that indicates that the expression result is being\n * calculated.\n */\nexport const Special = {\n  PENDING: {} as Pending,\n};\n\nexport type Result = string | number | boolean | undefined;\n\nexport type PendingResult = Special | Result;\n\nexport function letterbox(\n  viewW: number,\n  viewH: number,\n  objW: number,\n  objH: number,\n): string {\n  const scale = Math.min((viewW - 0) / objW, (viewH - 0) / objH);\n  return `matrix(${scale},0,0,${scale},0,0)`;\n}\n\n/**\n * @return string that can be parsed as CSS string with value str\n */\nexport function cssString(str: string): string {\n  return `\"${Base.escapeCSSStr(`${str}`)}\"`;\n}\n\n/**\n * @return string that can be parsed as CSS name\n */\nexport function cssIdent(name: string): string {\n  return Base.escapeCSSIdent(`${name}`);\n}\n\nexport function makeQualifiedName(\n  objName: string | null,\n  memberName: string,\n): string {\n  if (objName) {\n    return `${Base.escapeCSSIdent(objName)}.${Base.escapeCSSIdent(memberName)}`;\n  }\n  return Base.escapeCSSIdent(memberName);\n}\n\nexport let nextKeyIndex: number = 0;\n\n/**\n * Lexical scope of the expression.\n */\nexport class LexicalScope {\n  scopeKey: string;\n  children: LexicalScope[] = [];\n  zero: Const;\n  one: Const;\n  _true: Const;\n  _false: Const;\n  values: { [key: string]: Val } = {};\n  funcs: { [key: string]: Val } = {};\n  builtIns: { [key: string]: (...p1: Result[]) => Result } = {};\n\n  constructor(\n    public parent: LexicalScope,\n    public resolver?: (p1: string, p2: boolean) => Val,\n  ) {\n    this.scopeKey = `S${nextKeyIndex++}`;\n    this.zero = new Const(this, 0);\n    this.one = new Const(this, 1);\n    this._true = new Const(this, true);\n    this._false = new Const(this, false);\n    if (parent) {\n      parent.children.push(this);\n    }\n    if (!parent) {\n      // root scope\n      const builtIns = this.builtIns;\n      builtIns[\"floor\"] = Math.floor;\n      builtIns[\"ceil\"] = Math.ceil;\n      builtIns[\"round\"] = Math.round;\n      builtIns[\"sqrt\"] = Math.sqrt;\n      builtIns[\"min\"] = Math.min;\n      builtIns[\"max\"] = Math.max;\n      builtIns[\"letterbox\"] = letterbox;\n      builtIns[\"css-string\"] = cssString;\n      builtIns[\"css-name\"] = cssIdent;\n      builtIns[\"typeof\"] = (x) => typeof x;\n      this.defineBuiltInName(\"page-width\", function() {\n        return this.pageWidth();\n      });\n      this.defineBuiltInName(\"page-height\", function() {\n        return this.pageHeight();\n      });\n      this.defineBuiltInName(\"pref-font-family\", function() {\n        return this.pref.fontFamily;\n      });\n      this.defineBuiltInName(\"pref-night-mode\", function() {\n        return this.pref.nightMode;\n      });\n      this.defineBuiltInName(\"pref-hyphenate\", function() {\n        return this.pref.hyphenate;\n      });\n      this.defineBuiltInName(\"pref-margin\", function() {\n        return this.pref.margin;\n      });\n      this.defineBuiltInName(\"pref-line-height\", function() {\n        return this.pref.lineHeight;\n      });\n      this.defineBuiltInName(\"pref-column-width\", function() {\n        return this.pref.columnWidth * this.fontSize;\n      });\n      this.defineBuiltInName(\"pref-horizontal\", function() {\n        return this.pref.horizontal;\n      });\n      this.defineBuiltInName(\"pref-spread-view\", function() {\n        return this.pref.spreadView;\n      });\n\n      // For env(pub-title) and env(doc-title)\n      this.defineBuiltInName(\"pub-title\", function() {\n        return cssString(this.pubTitle ? this.pubTitle : \"\");\n      });\n      this.defineBuiltInName(\"doc-title\", function() {\n        return cssString(this.docTitle ? this.docTitle : \"\");\n      });\n    }\n  }\n\n  defineBuiltInName(name: string, fn: () => Result) {\n    this.values[name] = new Native(this, fn, name);\n  }\n\n  defineName(qualifiedName: string, val: Val): void {\n    this.values[qualifiedName] = val;\n  }\n\n  defineFunc(qualifiedName: string, val: Val): void {\n    this.funcs[qualifiedName] = val;\n  }\n\n  defineBuiltIn(qualifiedName: string, fn: (...p1: Result[]) => Result): void {\n    this.builtIns[qualifiedName] = fn;\n  }\n}\n\nexport function isAbsoluteLengthUnit(unit: string): boolean {\n  switch (unit.toLowerCase()) {\n    case \"px\":\n    case \"in\":\n    case \"pt\":\n    case \"pc\":\n    case \"cm\":\n    case \"mm\":\n    case \"q\":\n      return true;\n    default:\n      return false;\n  }\n}\n\nexport function isViewportRelativeLengthUnit(unit: string): boolean {\n  switch (unit.toLowerCase()) {\n    case \"vw\":\n    case \"vh\":\n    case \"vi\":\n    case \"vb\":\n    case \"vmin\":\n    case \"vmax\":\n    case \"pvw\":\n    case \"pvh\":\n    case \"pvi\":\n    case \"pvb\":\n    case \"pvmin\":\n    case \"pvmax\":\n      return true;\n    default:\n      return false;\n  }\n}\n\nexport function isFontRelativeLengthUnit(unit: string): boolean {\n  switch (unit.toLowerCase()) {\n    case \"em\":\n    case \"ex\":\n    case \"rem\":\n      return true;\n    default:\n      return false;\n  }\n}\n\nexport const defaultUnitSizes: { [key: string]: number } = {\n  px: 1,\n  in: 96,\n  pt: 4 / 3,\n  pc: 96 / 6,\n  cm: 96 / 2.54,\n  mm: 96 / 25.4,\n  q: 96 / 2.54 / 40,\n  em: 16,\n  rem: 16,\n  ex: 8,\n  // <resolution>\n  dppx: 1,\n  dpi: 1 / 96,\n  dpcm: 2.54 / 96,\n};\n\n/**\n * Returns if a unit should be converted to px before applied to the raw DOM.\n */\nexport function needUnitConversion(unit: string): boolean {\n  switch (unit) {\n    case \"q\":\n    case \"rem\":\n      return true;\n    default:\n      return false;\n  }\n}\n\nexport type ScopeContext = {\n  [key: string]: Result;\n};\n\n/**\n * Run-time instance of a scope and its children.\n */\nexport class Context {\n  protected actualPageWidth: number | null = null;\n  pageWidth: () => number;\n  protected actualPageHeight: number | null = null;\n  pageHeight: () => number;\n  initialFontSize: number;\n  rootFontSize: number | null = null;\n  fontSize: () => number;\n  pref: Preferences;\n  scopes: { [key: string]: ScopeContext } = {};\n  pageAreaWidth: number | null = null;\n  pageAreaHeight: number | null = null;\n  pageVertical: boolean | null = null;\n  pubTitle: string | null = null;\n  docTitle: string | null = null;\n\n  constructor(\n    public readonly rootScope: LexicalScope,\n    public readonly viewportWidth: number,\n    public readonly viewportHeight: number,\n    fontSize: number,\n  ) {\n    this.pageWidth = function() {\n      if (this.actualPageWidth) {\n        return this.actualPageWidth;\n      } else {\n        return this.pref.spreadView\n          ? Math.floor(viewportWidth / 2) - this.pref.pageBorder\n          : viewportWidth;\n      }\n    };\n    this.pageHeight = function() {\n      if (this.actualPageHeight) {\n        return this.actualPageHeight;\n      } else {\n        return viewportHeight;\n      }\n    };\n    this.initialFontSize = fontSize;\n    this.fontSize = function() {\n      if (this.rootFontSize) {\n        return this.rootFontSize;\n      } else {\n        return fontSize;\n      }\n    };\n    this.pref = defaultPreferencesInstance;\n  }\n\n  private getScopeContext(scope: LexicalScope): ScopeContext {\n    let s = this.scopes[scope.scopeKey];\n    if (!s) {\n      s = {};\n      this.scopes[scope.scopeKey] = s;\n    }\n    return s;\n  }\n\n  clearScope(scope: LexicalScope): void {\n    this.scopes[scope.scopeKey] = {};\n    for (let k = 0; k < scope.children.length; k++) {\n      this.clearScope(scope.children[k]);\n    }\n  }\n\n  queryUnitSize(unit: string, isRoot: boolean): number {\n    if (isViewportRelativeLengthUnit(unit)) {\n      const pvw = this.pageWidth() / 100;\n      const pvh = this.pageHeight() / 100;\n      const vw = this.pageAreaWidth != null ? this.pageAreaWidth / 100 : pvw;\n      const vh = this.pageAreaHeight != null ? this.pageAreaHeight / 100 : pvh;\n\n      switch (unit) {\n        case \"vw\":\n          return vw;\n        case \"vh\":\n          return vh;\n        case \"vi\":\n          return this.pageVertical ? vh : vw;\n        case \"vb\":\n          return this.pageVertical ? vw : vh;\n        case \"vmin\":\n          return vw < vh ? vw : vh;\n        case \"vmax\":\n          return vw > vh ? vw : vh;\n        case \"pvw\":\n          return pvw;\n        case \"pvh\":\n          return pvh;\n        case \"pvi\":\n          return this.pageVertical ? pvh : pvw;\n        case \"pvb\":\n          return this.pageVertical ? pvw : pvh;\n        case \"pvmin\":\n          return pvw < pvh ? pvw : pvh;\n        case \"pvmax\":\n          return pvw > pvh ? pvw : pvh;\n      }\n    }\n    if (unit == \"em\" || unit == \"rem\") {\n      return isRoot ? this.initialFontSize : this.fontSize();\n    }\n    if (unit == \"ex\") {\n      return (\n        (defaultUnitSizes[\"ex\"] *\n          (isRoot ? this.initialFontSize : this.fontSize())) /\n        defaultUnitSizes[\"em\"]\n      );\n    }\n    return defaultUnitSizes[unit];\n  }\n\n  evalName(scope: LexicalScope, qualifiedName: string): Val {\n    do {\n      let val = scope.values[qualifiedName];\n      if (val) {\n        return val;\n      }\n      if (scope.resolver) {\n        val = scope.resolver.call(this, qualifiedName, false);\n        if (val) {\n          return val;\n        }\n      }\n      scope = scope.parent;\n    } while (scope);\n    throw new Error(`Name '${qualifiedName}' is undefined`);\n  }\n\n  /**\n   * @param noBuiltInEval don't evaluate built-ins (for dependency calculations)\n   */\n  evalCall(\n    scope: LexicalScope,\n    qualifiedName: string,\n    params: Val[],\n    noBuiltInEval: boolean,\n  ): Val {\n    do {\n      let body = scope.funcs[qualifiedName];\n      if (body) {\n        return body; // will be expanded by callee\n      }\n      if (scope.resolver) {\n        body = scope.resolver.call(this, qualifiedName, true);\n        if (body) {\n          return body;\n        }\n      }\n      const fn = scope.builtIns[qualifiedName];\n      if (fn) {\n        if (noBuiltInEval) {\n          return scope.zero;\n        }\n        const args = Array(params.length);\n        for (let i = 0; i < params.length; i++) {\n          args[i] = params[i].evaluate(this);\n        }\n        return new Const(scope, fn.apply(this, args));\n      }\n      scope = scope.parent;\n    } while (scope);\n    throw new Error(`Function '${qualifiedName}' is undefined`);\n  }\n\n  evalMediaName(name: string, not: boolean): boolean {\n    const enabled = name === \"all\" || !!this.pref.enabledMediaTypes[name];\n    return not ? !enabled : enabled;\n  }\n\n  evalMediaTest(feature: string, value: Val): boolean {\n    let prefix = \"\";\n    const r = feature.match(/^(min|max)-(.*)$/);\n    if (r) {\n      prefix = r[1];\n      feature = r[2];\n    }\n    let req: Result | null = null;\n    let actual: number | null = null;\n    switch (feature) {\n      case \"width\":\n      case \"height\":\n      case \"device-width\":\n      case \"device-height\":\n      case \"color\":\n        if (value) {\n          req = value.evaluate(this);\n        }\n        break;\n    }\n    switch (feature) {\n      case \"width\":\n        actual = this.pageWidth();\n        break;\n      case \"height\":\n        actual = this.pageHeight();\n        break;\n      case \"device-width\":\n        actual = window.screen.availWidth;\n        break;\n      case \"device-height\":\n        actual = window.screen.availHeight;\n        break;\n      case \"color\":\n        actual = window.screen.pixelDepth;\n        break;\n    }\n    if (actual != null && req != null) {\n      switch (prefix) {\n        case \"min\":\n          return actual >= req;\n        case \"max\":\n          return actual <= req;\n        default:\n          return actual == req;\n      }\n    } else if (actual != null && value == null) {\n      return actual !== 0;\n    }\n    return false;\n  }\n\n  queryVal(scope: LexicalScope, key: string): Result | undefined {\n    const s = this.scopes[scope.scopeKey];\n    return s ? s[key] : undefined;\n  }\n\n  storeVal(scope: LexicalScope, key: string, val: Result): void {\n    this.getScopeContext(scope)[key] = val;\n  }\n}\n\n//---------- name resolution --------------\nexport type DependencyCache = {\n  [key: string]: boolean | Special;\n};\n\nexport class Val {\n  key: string;\n\n  constructor(public scope: LexicalScope) {\n    this.scope = scope;\n    this.key = `_${nextKeyIndex++}`;\n  }\n\n  /**\n   * @override\n   */\n  toString(): string {\n    const buf = new Base.StringBuffer();\n    this.appendTo(buf, 0);\n    return buf.toString();\n  }\n\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  protected evaluateCore(context: Context): Result {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  expand(context: Context, params: Val[]): Val {\n    return this;\n  }\n\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return other === this;\n  }\n\n  dependOuter(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    const cached = dependencyCache[this.key];\n    if (cached != null) {\n      if (cached === Special.PENDING) {\n        return false;\n      }\n      return cached as boolean;\n    } else {\n      dependencyCache[this.key] = Special.PENDING;\n      const result = this.dependCore(other, context, dependencyCache);\n      dependencyCache[this.key] = result;\n      return result;\n    }\n  }\n\n  depend(other: Val, context: Context): boolean {\n    return this.dependOuter(other, context, {});\n  }\n\n  evaluate(context: Context): Result {\n    let result = context.queryVal(this.scope, this.key);\n    if (typeof result != \"undefined\") {\n      return result;\n    }\n    result = this.evaluateCore(context);\n    context.storeVal(this.scope, this.key, result);\n    return result;\n  }\n\n  isMediaName(): boolean {\n    return false;\n  }\n}\n\nexport class Prefix extends Val {\n  constructor(scope: LexicalScope, public val: Val) {\n    super(scope);\n  }\n\n  protected getOp(): string {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  evalPrefix(val: Result): Result {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    const val = this.val.evaluate(context);\n    return this.evalPrefix(val);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this || this.val.dependOuter(other, context, dependencyCache)\n    );\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    if (10 < priority) {\n      buf.append(\"(\");\n    }\n    buf.append(this.getOp());\n    this.val.appendTo(buf, 10);\n    if (10 < priority) {\n      buf.append(\")\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const val = this.val.expand(context, params);\n    if (val === this.val) {\n      return this;\n    }\n    const r = new (this.constructor as any)(this.scope, val);\n    return r;\n  }\n}\n\nexport class Infix extends Val {\n  constructor(scope: LexicalScope, public lhs: Val, public rhs: Val) {\n    super(scope);\n  }\n\n  getPriority(): number {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  getOp(): string {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  evalInfix(lhs: Result, rhs: Result): Result {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    const lhs = this.lhs.evaluate(context);\n    const rhs = this.rhs.evaluate(context);\n    return this.evalInfix(lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this ||\n      this.lhs.dependOuter(other, context, dependencyCache) ||\n      this.rhs.dependOuter(other, context, dependencyCache)\n    );\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    const thisPriority = this.getPriority();\n    if (thisPriority <= priority) {\n      buf.append(\"(\");\n    }\n    this.lhs.appendTo(buf, thisPriority);\n    buf.append(this.getOp());\n    this.rhs.appendTo(buf, thisPriority);\n    if (thisPriority <= priority) {\n      buf.append(\")\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const lhs = this.lhs.expand(context, params);\n    const rhs = this.rhs.expand(context, params);\n    if (lhs === this.lhs && rhs === this.rhs) {\n      return this;\n    }\n    const r = new (this.constructor as any)(this.scope, lhs, rhs);\n    return r;\n  }\n}\n\nexport class Logical extends Infix {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 1;\n  }\n}\n\nexport class Comparison extends Infix {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 2;\n  }\n}\n\nexport class Additive extends Infix {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 3;\n  }\n}\n\nexport class Multiplicative extends Infix {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 4;\n  }\n}\n\nexport class Not extends Prefix {\n  constructor(scope: LexicalScope, val: Val) {\n    super(scope, val);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"!\";\n  }\n\n  /**\n   * @override\n   */\n  evalPrefix(val: Result): Result {\n    return !val;\n  }\n}\n\nexport class Negate extends Prefix {\n  constructor(scope: LexicalScope, val: Val) {\n    super(scope, val);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"-\";\n  }\n\n  /**\n   * @override\n   */\n  evalPrefix(val: Result): Result {\n    return -val;\n  }\n}\n\nexport class And extends Logical {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"&&\";\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return this.lhs.evaluate(context) && this.rhs.evaluate(context);\n  }\n}\n\nexport class AndMedia extends And {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \" and \";\n  }\n}\n\nexport class Or extends Logical {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"||\";\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return this.lhs.evaluate(context) || this.rhs.evaluate(context);\n  }\n}\n\nexport class OrMedia extends Or {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \", \";\n  }\n}\n\nexport class Lt extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"<\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs < rhs;\n  }\n}\n\nexport class Le extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"<=\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs <= rhs;\n  }\n}\n\nexport class Gt extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \">\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs > rhs;\n  }\n}\n\nexport class Ge extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \">=\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs >= rhs;\n  }\n}\n\nexport class Eq extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"==\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs == rhs;\n  }\n}\n\nexport class Ne extends Comparison {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"!=\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return lhs != rhs;\n  }\n}\n\nexport class Add extends Additive {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"+\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return (lhs as any) + rhs;\n  }\n}\n\nexport class Subtract extends Additive {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \" - \";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return (lhs as any) - (rhs as any);\n  }\n}\n\nexport class Multiply extends Multiplicative {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"*\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return (lhs as any) * (rhs as any);\n  }\n}\n\nexport class Divide extends Multiplicative {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"/\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return (lhs as any) / (rhs as any);\n  }\n}\n\nexport class Modulo extends Multiplicative {\n  constructor(scope: LexicalScope, lhs: Val, rhs: Val) {\n    super(scope, lhs, rhs);\n  }\n\n  /**\n   * @override\n   */\n  getOp(): string {\n    return \"%\";\n  }\n\n  /**\n   * @override\n   */\n  evalInfix(lhs: Result, rhs: Result): Result {\n    return (lhs as any) % (rhs as any);\n  }\n}\n\n/**\n * Numerical value with a unit.\n */\nexport class Numeric extends Val {\n  unit: string;\n\n  constructor(scope: LexicalScope, public num: number, unit: string) {\n    super(scope);\n    this.unit = unit.toLowerCase();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(this.num.toString());\n    buf.append(Base.escapeCSSIdent(this.unit));\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return this.num * context.queryUnitSize(this.unit, false);\n  }\n}\n\n/**\n * Named value.\n * @param qualifiedName CSS-escaped name sequence separated by dots.\n */\nexport class Named extends Val {\n  constructor(scope: LexicalScope, public qualifiedName: string) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(this.qualifiedName);\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return context.evalName(this.scope, this.qualifiedName).evaluate(context);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this ||\n      context\n        .evalName(this.scope, this.qualifiedName)\n        .dependOuter(other, context, dependencyCache)\n    );\n  }\n}\n\n/**\n * Named value.\n */\nexport class MediaName extends Val {\n  // FIXME: This property is added to reduce TypeScript error on `dependCore`\n  // but it is never initialized. Is it really correct code?\n  value: Val;\n\n  constructor(scope: LexicalScope, public not: boolean, public name: string) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    if (this.not) {\n      buf.append(\"not \");\n    }\n    buf.append(Base.escapeCSSIdent(this.name));\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return context.evalMediaName(this.name, this.not);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this || this.value.dependOuter(other, context, dependencyCache)\n    );\n  }\n\n  /**\n   * @override\n   */\n  isMediaName(): boolean {\n    return true;\n  }\n}\n\n/**\n * A value that is calculated by calling a JavaScript function. Note that the\n * result is cached and this function will be called only once between any\n * clears for its scope in the context.\n * @param fn function to call.\n * @param str a way to represent this value in toString() call.\n */\nexport class Native extends Val {\n  constructor(\n    scope: LexicalScope,\n    public fn: () => Result,\n    public str: string,\n  ) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(this.str);\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return this.fn.call(context);\n  }\n}\n\nexport function appendValArray(buf: Base.StringBuffer, arr: Val[]): void {\n  buf.append(\"(\");\n  for (let i = 0; i < arr.length; i++) {\n    if (i) {\n      buf.append(\",\");\n    }\n    arr[i].appendTo(buf, 0);\n  }\n  buf.append(\")\");\n}\n\nexport function expandValArray(\n  context: Context,\n  arr: Val[],\n  params: Val[],\n): Val[] {\n  let expanded: Val[] = arr;\n  for (let i = 0; i < arr.length; i++) {\n    const p = arr[i].expand(context, params);\n    if (arr !== expanded) {\n      expanded[i] = p;\n    } else if (p !== arr[i]) {\n      expanded = Array(arr.length);\n      for (let j = 0; j < i; j++) {\n        expanded[j] = arr[j];\n      }\n      expanded[i] = p;\n    }\n  }\n  return expanded;\n}\n\nexport function evalValArray(context: Context, arr: Val[]): Result[] {\n  const result: Result[] = Array(arr.length);\n  for (let i = 0; i < arr.length; i++) {\n    result[i] = arr[i].evaluate(context);\n  }\n  return result;\n}\n\nexport class Call extends Val {\n  constructor(\n    scope: LexicalScope,\n    public qualifiedName: string,\n    public params: Val[],\n  ) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(this.qualifiedName);\n    appendValArray(buf, this.params);\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    const body = context.evalCall(\n      this.scope,\n      this.qualifiedName,\n      this.params,\n      false,\n    );\n    return body.expand(context, this.params).evaluate(context);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    if (other === this) {\n      return true;\n    }\n    for (let i = 0; i < this.params.length; i++) {\n      if (this.params[i].dependOuter(other, context, dependencyCache)) {\n        return true;\n      }\n    }\n    const body = context.evalCall(\n      this.scope,\n      this.qualifiedName,\n      this.params,\n      true,\n    );\n\n    // No expansion here!\n    return body.dependOuter(other, context, dependencyCache);\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const expandedParams = expandValArray(context, this.params, params);\n    if (expandedParams === this.params) {\n      return this;\n    }\n    return new Call(this.scope, this.qualifiedName, expandedParams);\n  }\n}\n\nexport class Cond extends Val {\n  constructor(\n    scope: LexicalScope,\n    public cond: Val,\n    public ifTrue: Val,\n    public ifFalse: Val,\n  ) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    if (priority > 0) {\n      buf.append(\"(\");\n    }\n    this.cond.appendTo(buf, 0);\n    buf.append(\"?\");\n    this.ifTrue.appendTo(buf, 0);\n    buf.append(\":\");\n    this.ifFalse.appendTo(buf, 0);\n    if (priority > 0) {\n      buf.append(\")\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    if (this.cond.evaluate(context)) {\n      return this.ifTrue.evaluate(context);\n    } else {\n      return this.ifFalse.evaluate(context);\n    }\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this ||\n      this.cond.dependOuter(other, context, dependencyCache) ||\n      this.ifTrue.dependOuter(other, context, dependencyCache) ||\n      this.ifFalse.dependOuter(other, context, dependencyCache)\n    );\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const cond = this.cond.expand(context, params);\n    const ifTrue = this.ifTrue.expand(context, params);\n    const ifFalse = this.ifFalse.expand(context, params);\n    if (\n      cond === this.cond &&\n      ifTrue === this.ifTrue &&\n      ifFalse === this.ifFalse\n    ) {\n      return this;\n    }\n    const r = new Cond(this.scope, cond, ifTrue, ifFalse);\n    return r;\n  }\n}\n\nexport class Const extends Val {\n  constructor(scope: LexicalScope, public val: Result) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    switch (typeof this.val) {\n      case \"number\":\n      case \"boolean\":\n        buf.append(this.val.toString());\n        break;\n      case \"string\":\n        buf.append('\"');\n        buf.append(Base.escapeCSSStr(this.val));\n        buf.append('\"');\n        break;\n      default:\n        throw new Error(\"F_UNEXPECTED_STATE\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return this.val;\n  }\n}\n\nexport class MediaTest extends Val {\n  constructor(scope: LexicalScope, public name: MediaName, public value: Val) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(\"(\");\n    buf.append(Base.escapeCSSStr(this.name.name));\n    buf.append(\":\");\n    this.value.appendTo(buf, 0);\n    buf.append(\")\");\n  }\n\n  /**\n   * @override\n   */\n  evaluateCore(context: Context): Result {\n    return context.evalMediaTest(this.name.name, this.value);\n  }\n\n  /**\n   * @override\n   */\n  dependCore(\n    other: Val,\n    context: Context,\n    dependencyCache: DependencyCache,\n  ): boolean {\n    return (\n      other === this || this.value.dependOuter(other, context, dependencyCache)\n    );\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const value = this.value.expand(context, params);\n    if (value === this.value) {\n      return this;\n    }\n    const r = new MediaTest(this.scope, this.name, value);\n    return r;\n  }\n}\n\nexport class Param extends Val {\n  constructor(scope: LexicalScope, public index: number) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, priority: number): void {\n    buf.append(\"$\");\n    buf.append(this.index.toString());\n  }\n\n  /**\n   * @override\n   */\n  expand(context: Context, params: Val[]): Val {\n    const v = params[this.index];\n    if (!v) {\n      throw new Error(`Parameter missing: ${this.index}`);\n    }\n    return v as Val;\n  }\n}\n\nexport function and(scope: LexicalScope, v1: Val, v2: Val): Val {\n  if (\n    v1 === scope._false ||\n    v1 === scope.zero ||\n    v2 == scope._false ||\n    v2 == scope.zero\n  ) {\n    return scope._false;\n  }\n  if (v1 === scope._true || v1 === scope.one) {\n    return v2;\n  }\n  if (v2 === scope._true || v2 === scope.one) {\n    return v1;\n  }\n  return new And(scope, v1, v2);\n}\n\nexport function add(scope: LexicalScope, v1: Val, v2: Val): Val {\n  if (v1 === scope.zero) {\n    return v2;\n  }\n  if (v2 === scope.zero) {\n    return v1;\n  }\n  return new Add(scope, v1, v2);\n}\n\nexport function sub(scope: LexicalScope, v1: Val, v2: Val): Val {\n  if (v1 === scope.zero) {\n    return new Negate(scope, v2);\n  }\n  if (v2 === scope.zero) {\n    return v1;\n  }\n  return new Subtract(scope, v1, v2);\n}\n\nexport function mul(scope: LexicalScope, v1: Val, v2: Val): Val {\n  if (v1 === scope.zero || v2 === scope.zero) {\n    return scope.zero;\n  }\n  if (v1 === scope.one) {\n    return v2;\n  }\n  if (v2 === scope.one) {\n    return v1;\n  }\n  return new Multiply(scope, v1, v2);\n}\n\nexport function div(scope: LexicalScope, v1: Val, v2: Val): Val {\n  if (v1 === scope.zero) {\n    return scope.zero;\n  }\n  if (v2 === scope.one) {\n    return v1;\n  }\n  return new Divide(scope, v1, v2);\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Css - CSS Values and utilities to handle them.\n */\nimport * as Base from \"./base\";\nimport * as Exprs from \"./exprs\";\n\nexport class Visitor {\n  /**\n   * @return void\n   */\n  visitValues(values: Val[]): any {\n    for (let i = 0; i < values.length; i++) {\n      values[i].visit(this);\n    }\n  }\n\n  visitEmpty(empty: Val): Val {\n    throw new Error(\"E_CSS_EMPTY_NOT_ALLOWED\");\n  }\n\n  visitSlash(slash: Val): Val {\n    throw new Error(\"E_CSS_SLASH_NOT_ALLOWED\");\n  }\n\n  visitStr(str: Str): Val {\n    throw new Error(\"E_CSS_STR_NOT_ALLOWED\");\n  }\n\n  visitIdent(ident: Ident): Val {\n    throw new Error(\"E_CSS_IDENT_NOT_ALLOWED\");\n  }\n\n  visitNumeric(numeric: Numeric): Val {\n    throw new Error(\"E_CSS_NUMERIC_NOT_ALLOWED\");\n  }\n\n  visitNum(num: Num): Val {\n    throw new Error(\"E_CSS_NUM_NOT_ALLOWED\");\n  }\n\n  visitInt(num: Int): Val {\n    return this.visitNum(num);\n  }\n\n  visitColor(color: Color): Val {\n    throw new Error(\"E_CSS_COLOR_NOT_ALLOWED\");\n  }\n\n  visitURL(url: URL): Val {\n    throw new Error(\"E_CSS_URL_NOT_ALLOWED\");\n  }\n\n  visitSpaceList(list: SpaceList): Val {\n    throw new Error(\"E_CSS_LIST_NOT_ALLOWED\");\n  }\n\n  visitCommaList(list: CommaList): Val {\n    throw new Error(\"E_CSS_COMMA_NOT_ALLOWED\");\n  }\n\n  visitFunc(func: Func): Val {\n    throw new Error(\"E_CSS_FUNC_NOT_ALLOWED\");\n  }\n\n  visitExpr(expr: Expr): Val {\n    throw new Error(\"E_CSS_EXPR_NOT_ALLOWED\");\n  }\n}\n\nexport class FilterVisitor extends Visitor {\n  constructor() {\n    super();\n  }\n\n  visitValues(values: Val[]): Val[] {\n    let arr: Val[] = null;\n    for (let i = 0; i < values.length; i++) {\n      const before = values[i];\n      const after = before.visit(this);\n      if (arr) {\n        arr[i] = after;\n      } else if (before !== after) {\n        arr = new Array(values.length);\n        for (let k = 0; k < i; k++) {\n          arr[k] = values[k];\n        }\n        arr[i] = after;\n      }\n    }\n    return arr || values;\n  }\n\n  /**\n   * @override\n   */\n  visitStr(str: Str): Val {\n    return str;\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Ident): Val {\n    return ident;\n  }\n\n  /**\n   * @override\n   */\n  visitSlash(slash: Val): Val {\n    return slash;\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Numeric): Val {\n    return numeric;\n  }\n\n  /**\n   * @override\n   */\n  visitNum(num: Num): Val {\n    return num;\n  }\n\n  /**\n   * @override\n   */\n  visitInt(num: Int): Val {\n    return num;\n  }\n\n  /**\n   * @override\n   */\n  visitColor(color: Color): Val {\n    return color;\n  }\n\n  /**\n   * @override\n   */\n  visitURL(url: URL): Val {\n    return url;\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: SpaceList): Val {\n    const values = this.visitValues(list.values);\n    if (values === list.values) {\n      return list;\n    }\n    return new SpaceList(values);\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: CommaList): Val {\n    const values = this.visitValues(list.values);\n    if (values === list.values) {\n      return list;\n    }\n    return new CommaList(values);\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Func): Val {\n    const values = this.visitValues(func.values);\n    if (values === func.values) {\n      return func;\n    }\n    return new Func(func.name, values);\n  }\n\n  /**\n   * @override\n   */\n  visitExpr(expr: Expr): Val {\n    return expr;\n  }\n}\n\nexport class Val {\n  /**\n   * @override\n   */\n  toString(): string {\n    const buf = new Base.StringBuffer();\n    this.appendTo(buf, true);\n    return buf.toString();\n  }\n\n  stringValue(): string {\n    const buf = new Base.StringBuffer();\n    this.appendTo(buf, false);\n    return buf.toString();\n  }\n\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    throw new Error(\"F_ABSTRACT\");\n  }\n\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(\"[error]\");\n  }\n\n  isExpr(): boolean {\n    return false;\n  }\n\n  isNumeric(): boolean {\n    return false;\n  }\n\n  isNum(): boolean {\n    return false;\n  }\n\n  isIdent(): boolean {\n    return false;\n  }\n\n  isSpaceList(): boolean {\n    return false;\n  }\n\n  visit(visitor: any): any {\n    throw new Error(\"F_ABSTRACT\");\n  }\n}\n\nexport class Empty extends Val {\n  private static empty: Empty;\n\n  public static get instance(): Empty {\n    if (!this.empty) {\n      this.empty = new Empty();\n    }\n    return this.empty;\n  }\n\n  private constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    return new Exprs.Const(scope, \"\");\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {}\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitEmpty(this);\n  }\n}\n\nexport const empty: Empty = Empty.instance;\n\nexport class Slash extends Val {\n  private static slash: Slash;\n\n  public static get instance(): Slash {\n    if (!this.slash) {\n      this.slash = new Slash();\n    }\n    return this.slash;\n  }\n\n  private constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    return new Exprs.Const(scope, \"/\");\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(\"/\");\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitSlash(this);\n  }\n}\n\nexport const slash: Slash = Slash.instance;\n\nexport class Str extends Val {\n  constructor(public str: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    return new Exprs.Const(scope, this.str);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    if (toString) {\n      buf.append('\"');\n      buf.append(Base.escapeCSSStr(this.str));\n      buf.append('\"');\n    } else {\n      buf.append(this.str);\n    }\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitStr(this);\n  }\n}\n\nconst nameTable = {};\n\nexport class Ident extends Val {\n  constructor(public name: string) {\n    super();\n    if (nameTable[name]) {\n      throw new Error(\"E_INVALID_CALL\");\n    }\n    nameTable[name] = this;\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    return new Exprs.Const(scope, this.name);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    if (toString) {\n      buf.append(Base.escapeCSSIdent(this.name));\n    } else {\n      buf.append(this.name);\n    }\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitIdent(this);\n  }\n\n  /**\n   * @override\n   */\n  isIdent(): boolean {\n    return true;\n  }\n}\n\nexport function getName(name: string): Ident {\n  let r = nameTable[name];\n  if (!r) {\n    r = new Ident(name);\n  }\n  return r;\n}\n\nexport class Numeric extends Val {\n  unit: string;\n\n  constructor(public num: number, unit: string) {\n    super();\n    this.unit = unit.toLowerCase(); // units are case-insensitive in CSS\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    if (this.num == 0) {\n      return scope.zero;\n    }\n    if (ref && this.unit == \"%\") {\n      if (this.num == 100) {\n        return ref;\n      }\n      return new Exprs.Multiply(\n        scope,\n        ref,\n        new Exprs.Const(scope, this.num / 100),\n      );\n    }\n    return new Exprs.Numeric(scope, this.num, this.unit);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(this.num.toString());\n    buf.append(this.unit);\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitNumeric(this);\n  }\n\n  /**\n   * @override\n   */\n  isNumeric(): boolean {\n    return true;\n  }\n}\n\nexport class Num extends Val {\n  constructor(public num: number) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  toExpr(scope: Exprs.LexicalScope, ref: Exprs.Val): Exprs.Val {\n    if (this.num == 0) {\n      return scope.zero;\n    }\n    if (this.num == 1) {\n      return scope.one;\n    }\n    return new Exprs.Const(scope, this.num);\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(this.num.toString());\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitNum(this);\n  }\n\n  /**\n   * @override\n   */\n  isNum(): boolean {\n    return true;\n  }\n}\n\nexport class Int extends Num {\n  constructor(num: number) {\n    super(num);\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitInt(this);\n  }\n}\n\nexport class Color extends Val {\n  constructor(public rgb: number) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(\"#\");\n    const str = this.rgb.toString(16);\n    buf.append(\"000000\".substr(str.length));\n    buf.append(str);\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitColor(this);\n  }\n}\n\nexport class URL extends Val {\n  constructor(public url: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append('url(\"');\n    buf.append(Base.escapeCSSStr(this.url));\n    buf.append('\")');\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitURL(this);\n  }\n}\n\nexport function appendList(\n  buf: Base.StringBuffer,\n  values: Val[],\n  separator: string,\n  toString: boolean,\n): void {\n  const length = values.length;\n  values[0].appendTo(buf, toString);\n  for (let i = 1; i < length; i++) {\n    buf.append(separator);\n    values[i].appendTo(buf, toString);\n  }\n}\n\nexport class SpaceList extends Val {\n  constructor(public values: Val[]) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    appendList(buf, this.values, \" \", toString);\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitSpaceList(this);\n  }\n\n  /**\n   * @override\n   */\n  isSpaceList(): boolean {\n    return true;\n  }\n}\n\nexport class CommaList extends Val {\n  constructor(public values: Val[]) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    appendList(buf, this.values, \",\", toString);\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitCommaList(this);\n  }\n}\n\nexport class Func extends Val {\n  constructor(public name: string, public values: Val[]) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(Base.escapeCSSIdent(this.name));\n    buf.append(\"(\");\n    appendList(buf, this.values, \",\", toString);\n    buf.append(\")\");\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitFunc(this);\n  }\n}\n\nexport class Expr extends Val {\n  constructor(public expr: Exprs.Val) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  toExpr(): Exprs.Val {\n    return this.expr;\n  }\n\n  /**\n   * @override\n   */\n  appendTo(buf: Base.StringBuffer, toString: boolean): void {\n    buf.append(\"-epubx-expr(\");\n    this.expr.appendTo(buf, 0);\n    buf.append(\")\");\n  }\n\n  /**\n   * @override\n   */\n  visit(visitor: any): any {\n    return visitor.visitExpr(this);\n  }\n\n  /**\n   * @override\n   */\n  isExpr(): boolean {\n    return true;\n  }\n}\n\nexport function toNumber(val: Val, context: Exprs.Context): number {\n  if (val) {\n    if (val.isNumeric()) {\n      const numeric = val as Numeric;\n      return context.queryUnitSize(numeric.unit, false) * numeric.num;\n    }\n    if (val.isNum()) {\n      return (val as Num).num;\n    }\n  }\n  return 0;\n}\n\n/**\n * Convert numeric value to px\n */\nexport function convertNumericToPx(val: Val, context: Exprs.Context): Numeric {\n  return new Numeric(toNumber(val, context), \"px\");\n}\n\nexport const ident: { [key: string]: Ident } = {\n  absolute: getName(\"absolute\"),\n  all: getName(\"all\"),\n  always: getName(\"always\"),\n  auto: getName(\"auto\"),\n  avoid: getName(\"avoid\"),\n  balance: getName(\"balance\"),\n  balance_all: getName(\"balance-all\"),\n  block: getName(\"block\"),\n  block_end: getName(\"block-end\"),\n  block_start: getName(\"block-start\"),\n  both: getName(\"both\"),\n  bottom: getName(\"bottom\"),\n  border_box: getName(\"border-box\"),\n  break_all: getName(\"break-all\"),\n  break_word: getName(\"break-word\"),\n  crop: getName(\"crop\"),\n  cross: getName(\"cross\"),\n  column: getName(\"column\"),\n  exclusive: getName(\"exclusive\"),\n  _false: getName(\"false\"),\n  fixed: getName(\"fixed\"),\n  flex: getName(\"flex\"),\n  footnote: getName(\"footnote\"),\n  footer: getName(\"footer\"),\n  header: getName(\"header\"),\n  hidden: getName(\"hidden\"),\n  horizontal_tb: getName(\"horizontal-tb\"),\n  inherit: getName(\"inherit\"),\n  inline: getName(\"inline\"),\n  inline_block: getName(\"inline-block\"),\n  inline_end: getName(\"inline-end\"),\n  inline_start: getName(\"inline-start\"),\n  landscape: getName(\"landscape\"),\n  left: getName(\"left\"),\n  line: getName(\"line\"),\n  list_item: getName(\"list-item\"),\n  ltr: getName(\"ltr\"),\n  manual: getName(\"manual\"),\n  none: getName(\"none\"),\n  normal: getName(\"normal\"),\n  oeb_page_foot: getName(\"oeb-page-foot\"),\n  oeb_page_head: getName(\"oeb-page-head\"),\n  page: getName(\"page\"),\n  relative: getName(\"relative\"),\n  right: getName(\"right\"),\n  same: getName(\"same\"),\n  scale: getName(\"scale\"),\n  snap_block: getName(\"snap-block\"),\n  spread: getName(\"spread\"),\n  _static: getName(\"static\"),\n  rtl: getName(\"rtl\"),\n  table: getName(\"table\"),\n  table_caption: getName(\"table-caption\"),\n  table_cell: getName(\"table-cell\"),\n  table_footer_group: getName(\"table-footer-group\"),\n  table_header_group: getName(\"table-header-group\"),\n  table_row: getName(\"table-row\"),\n  top: getName(\"top\"),\n  transparent: getName(\"transparent\"),\n  vertical_lr: getName(\"vertical-lr\"),\n  vertical_rl: getName(\"vertical-rl\"),\n  visible: getName(\"visible\"),\n  _true: getName(\"true\"),\n};\n\nexport const hundredPercent: Numeric = new Numeric(100, \"%\");\n\nexport const fullWidth: Numeric = new Numeric(100, \"pvw\");\n\nexport const fullHeight: Numeric = new Numeric(100, \"pvh\");\n\nexport const numericZero: Numeric = new Numeric(0, \"px\");\n\nexport const processingOrder = {\n  \"font-size\": 1,\n  color: 2,\n};\n\n/**\n * Function to sort property names in the order they should be processed\n */\nexport function processingOrderFn(name1: string, name2: string): number {\n  const n1 = processingOrder[name1] || Number.MAX_VALUE;\n  const n2 = processingOrder[name2] || Number.MAX_VALUE;\n  return n1 - n2;\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview GeometryUtil - Geometric utilities.\n */\nimport * as Logging from \"./logging\";\n\nexport class Rect {\n  constructor(\n    public x1: number,\n    public y1: number,\n    public x2: number,\n    public y2: number,\n  ) {}\n}\n\nexport class Point {\n  constructor(public x: number, public y: number) {}\n}\n\nexport class Insets {\n  constructor(\n    public left: number,\n    public top: number,\n    public right: number,\n    public bottom: number,\n  ) {}\n}\n\nexport class Segment {\n  constructor(\n    public low: Point,\n    public high: Point,\n    public winding: number,\n    public shapeId: number,\n  ) {}\n}\n\n/**\n * A single band for exclusion result. Left float is from the left box edge\n * to x1. Right float is from x2 to the right box edge.\n */\nexport class Band {\n  /** Left float. */\n  left: Element | null = null;\n\n  /** Right float. */\n  right: Element | null = null;\n\n  constructor(\n    public y1: number,\n    public y2: number,\n    public x1: number,\n    public x2: number,\n  ) {}\n}\n\nexport function segmentCompare(s1: Segment, s2: Segment): number {\n  return s1.low.y - s2.low.y || s1.low.x - s2.low.x;\n}\n\nexport class Shape {\n  constructor(public points: Point[]) {}\n\n  /**\n   * Converts this shape to a sequence of Segments and adds segments to the\n   * given array.\n   * @param arr array to add segments.\n   * @param id shapeId to write into segments.\n   */\n  addSegments(arr: Segment[], id: number): void {\n    const points = this.points;\n    const length = points.length;\n    let prev = points[length - 1];\n    for (let i = 0; i < length; i++) {\n      const curr = points[i];\n      let s: Segment;\n      if (prev.y < curr.y) {\n        s = new Segment(prev, curr, 1, id);\n      } else {\n        s = new Segment(curr, prev, -1, id);\n      }\n      arr.push(s);\n      prev = curr;\n    }\n  }\n\n  withOffset(offsetX: number, offsetY: number): Shape {\n    const points = [];\n    for (const p of this.points) {\n      points.push(new Point(p.x + offsetX, p.y + offsetY));\n    }\n    return new Shape(points);\n  }\n}\n\nexport function shapeForEllipse(\n  cx: number,\n  cy: number,\n  rx: number,\n  ry: number,\n): Shape {\n  const count = 20;\n  const points: Point[] = [];\n  for (let i = 0; i < count; i++) {\n    const a = (i * 2 * Math.PI) / count;\n    points.push(new Point(cx + rx * Math.sin(a), cy + ry * Math.cos(a)));\n  }\n  return new Shape(points);\n}\n\nexport function shapeForRect(\n  x1: number,\n  y1: number,\n  x2: number,\n  y2: number,\n): Shape {\n  return new Shape([\n    new Point(x1, y1),\n    new Point(x2, y1),\n    new Point(x2, y2),\n    new Point(x1, y2),\n  ]);\n}\n\nexport function shapeForRectObj(r: Rect): Shape {\n  return new Shape([\n    new Point(r.x1, r.y1),\n    new Point(r.x2, r.y1),\n    new Point(r.x2, r.y2),\n    new Point(r.x1, r.y2),\n  ]);\n}\n\nexport class BandIntersection {\n  constructor(\n    public x: number,\n    public winding: number,\n    public shapeId: number,\n    public lowOrHigh: number,\n  ) {}\n}\n\nexport function intersectY(s: Segment, y: number): number {\n  const x =\n    s.low.x + ((s.high.x - s.low.x) * (y - s.low.y)) / (s.high.y - s.low.y);\n  if (isNaN(x)) {\n    throw new Error(\"Bad intersection\");\n  }\n  return x;\n}\n\nexport function addBandIntersections(\n  intersections: BandIntersection[],\n  s: Segment,\n  y1: number,\n  y2: number,\n): void {\n  let x1: number;\n  let w1: number;\n  let x2: number;\n  let w2: number;\n  if (s.high.y < y1) {\n    Logging.logger.warn(\"Error: inconsistent segment (1)\");\n  }\n  if (s.low.y <= y1) {\n    // outside\n    x1 = intersectY(s, y1);\n    w1 = s.winding;\n  } else {\n    x1 = s.low.x;\n    w1 = 0;\n  }\n  if (s.high.y >= y2) {\n    // outside\n    x2 = intersectY(s, y2);\n    w2 = s.winding;\n  } else {\n    x2 = s.high.x;\n    w2 = 0;\n  }\n  if (x1 < x2) {\n    intersections.push(new BandIntersection(x1, w1, s.shapeId, -1));\n    intersections.push(new BandIntersection(x2, w2, s.shapeId, 1));\n  } else {\n    intersections.push(new BandIntersection(x2, w2, s.shapeId, -1));\n    intersections.push(new BandIntersection(x1, w1, s.shapeId, 1));\n  }\n}\n\nexport function mergeIntersections(\n  intersections: BandIntersection[],\n  includeCount: number,\n  excludeCount: number,\n): number[] {\n  const shapeCount = includeCount + excludeCount;\n  const windings1: number[] = Array(shapeCount);\n  const windings2: number[] = Array(shapeCount);\n  let i: number;\n  for (i = 0; i <= shapeCount; i++) {\n    windings1[i] = 0;\n    windings2[i] = 0;\n  }\n  const xranges: number[] = [];\n  let inside: boolean = false;\n  const intersectionCount = intersections.length;\n  for (let k = 0; k < intersectionCount; k++) {\n    const intersection = intersections[k];\n    windings1[intersection.shapeId] += intersection.winding;\n    windings2[intersection.shapeId] += intersection.lowOrHigh;\n    let stillInside = false;\n    for (i = 0; i < includeCount; i++) {\n      if (windings1[i] && !windings2[i]) {\n        stillInside = true;\n        break;\n      }\n    }\n    if (stillInside) {\n      for (i = includeCount; i <= shapeCount; i++) {\n        if (windings1[i] || windings2[i]) {\n          stillInside = false;\n          break;\n        }\n      }\n    }\n    if (inside != stillInside) {\n      xranges.push(intersection.x);\n      inside = stillInside;\n    }\n  }\n  return xranges;\n}\n\n/**\n * Round v up to make it a multiple of unit. If unit is zero, return v.\n */\nexport function ceil(v: number, unit: number): number {\n  return unit ? Math.ceil(v / unit) * unit : v;\n}\n\n/**\n * Round v down to make it a multiple of unit. If unit is zero, return v.\n */\nexport function floor(v: number, unit: number): number {\n  return unit ? Math.floor(v / unit) * unit : v;\n}\n\nexport function rotatePoint(point: Point): Point {\n  return new Point(point.y, -point.x);\n}\n\n/**\n * Vertical box to pseudo-horizontal coords.\n */\nexport function rotateBox(box: Rect): Rect {\n  return new Rect(box.y1, -box.x2, box.y2, -box.x1);\n}\n\n/**\n * Pseudo-horizontal coords to vertical.\n */\nexport function unrotateBox(box: Rect): Rect {\n  return new Rect(-box.y2, box.x1, -box.y1, box.x2);\n}\n\nexport function rotateShape(shape: Shape): Shape {\n  return new Shape(shape.points.map((point) => rotatePoint(point)));\n}\n\nexport function shapesToBands(\n  box: Rect,\n  include: Shape[],\n  exclude: Shape[],\n  granularity: number,\n  snapHeight: number,\n  vertical: boolean,\n): Band[] {\n  if (vertical) {\n    box = rotateBox(box);\n    include = include.map((shape) => rotateShape(shape));\n    exclude = exclude.map((shape) => rotateShape(shape));\n  }\n  const includeCount = include.length;\n  const excludeCount = exclude ? exclude.length : 0;\n  const result: Band[] = [];\n  const segments: Segment[] = [];\n  let i: number;\n  let k: number;\n  let segment: Segment;\n  for (i = 0; i < includeCount; i++) {\n    include[i].addSegments(segments, i);\n  }\n  for (i = 0; i < excludeCount; i++) {\n    exclude[i].addSegments(segments, i + includeCount);\n  }\n  const segmentCount = segments.length;\n  segments.sort(segmentCompare);\n  let lowestIncludeIndex = 0;\n  while (segments[lowestIncludeIndex].shapeId >= includeCount) {\n    lowestIncludeIndex++;\n  }\n  let y = segments[lowestIncludeIndex].low.y;\n  if (y > box.y1) {\n    result.push(new Band(box.y1, y, box.x2, box.x2));\n  }\n  let segmentIndex = 0;\n  const activeSegments: Segment[] = [];\n  while (\n    segmentIndex < segmentCount &&\n    (segment = segments[segmentIndex]).low.y < y\n  ) {\n    if (segment.high.y > y) {\n      activeSegments.push(segment);\n    }\n    segmentIndex++;\n  }\n\n  // process the segments from low to high y values\n  while (segmentIndex < segmentCount || activeSegments.length > 0) {\n    // calculate the height of the band to work with\n    let y2 = box.y2; // band bottom\n    // min possible y2\n    const y2min = Math.min(\n      ceil(Math.ceil(y + granularity), snapHeight),\n      box.y2,\n    );\n    for (k = 0; k < activeSegments.length && y2 > y2min; k++) {\n      segment = activeSegments[k];\n      if (segment.low.x == segment.high.x) {\n        // vertical\n        if (segment.high.y < y2) {\n          y2 = Math.max(floor(segment.high.y, snapHeight), y2min);\n        }\n      } else if (segment.low.x != segment.high.x) {\n        // TODO: should we compare y???\n        // slanted (not horizontal)\n        y2 = y2min;\n      }\n    }\n    if (y2 > box.y2) {\n      y2 = box.y2;\n    }\n\n    // include new segments, decreasing y2 if needed\n    while (\n      segmentIndex < segmentCount &&\n      (segment = segments[segmentIndex]).low.y < y2\n    ) {\n      if (segment.high.y < y) {\n        segmentIndex++;\n        continue;\n      }\n      if (segment.low.y < y2min) {\n        if (segment.low.y == segment.high.y && segment.low.y == y) {\n          // Horizontal segment that goes right at y is not active,\n          // but consume it anyway\n        } else {\n          activeSegments.push(segment);\n          y2 = y2min;\n        }\n        segmentIndex++;\n      } else {\n        // Do not consume it, consider bottom edge \"outside\"\n        const yn = floor(segment.low.y, snapHeight);\n        if (yn < y2) {\n          y2 = yn;\n        }\n        break;\n      }\n    }\n\n    // now look at the band with top at y and bottom at y2\n    // activeSegments should list all segments that intersect that band\n\n    // find all intersections with the band\n    const bandIntersections: BandIntersection[] = [];\n    for (k = 0; k < activeSegments.length; k++) {\n      addBandIntersections(bandIntersections, activeSegments[k], y, y2);\n    }\n    bandIntersections.sort(\n      (bi1, bi2) => bi1.x - bi2.x || bi1.lowOrHigh - bi2.lowOrHigh,\n    );\n    const xranges = mergeIntersections(\n      bandIntersections,\n      includeCount,\n      excludeCount,\n    );\n    if (xranges.length == 0) {\n      result.push(new Band(y, y2, box.x2, box.x2));\n    } else {\n      // get the widest\n      let width = 0;\n      let x = box.x1;\n      for (k = 0; k < xranges.length; k += 2) {\n        const rx = Math.max(box.x1, xranges[k]);\n        const rw = Math.min(box.x2, xranges[k + 1]) - rx;\n        if (rw > width) {\n          width = rw;\n          x = rx;\n        }\n      }\n      if (width == 0) {\n        // no space left\n        result.push(new Band(y, y2, box.x2, box.x2));\n      } else {\n        result.push(\n          new Band(y, y2, Math.max(x, box.x1), Math.min(x + width, box.x2)),\n        );\n      }\n    }\n    if (y2 == box.y2) {\n      break;\n    }\n    y = y2;\n    for (k = activeSegments.length - 1; k >= 0; k--) {\n      if (activeSegments[k].high.y <= y2) {\n        activeSegments.splice(k, 1);\n      }\n    }\n  }\n  normalize(box, result);\n  return result;\n}\n\nexport function normalize(box: Rect, bands: Band[]): void {\n  let k = bands.length - 1;\n\n  // Merge bands with the same x1, x2 and remove unneeded bands at the end.\n  // Create fictious last band to merge unneeded bands at the end\n  let currBand = new Band(box.y2, box.y2, box.x1, box.x2);\n  while (k >= 0) {\n    const prevBand = currBand; // result[k+1]\n    currBand = bands[k];\n    if (\n      currBand.y2 - currBand.y1 < 1 || // Remove bands with height less than 1px\n      (currBand.x1 == prevBand.x1 && currBand.x2 == prevBand.x2)\n    ) {\n      prevBand.y1 = currBand.y1; // merge\n      bands.splice(k, 1);\n      currBand = prevBand;\n    }\n    k--;\n  }\n}\n\n/**\n * Find the index of the bottommost band so that y < band.y2\n */\nexport function findBand(bands: Band[], y: number): number {\n  let low = 0;\n  let high = bands.length;\n  while (low < high) {\n    const mid = Math.floor((low + high) / 2);\n    if (y >= bands[mid].y2) {\n      low = mid + 1;\n    } else {\n      high = mid;\n    }\n  }\n  return low;\n}\n\n/**\n * Find the uppermost rectangle contained in the specified rect which occupies\n * full width of the rect without overlapping with any band in the specified\n * bands.\n * @returns Returns null if such rectangle does not exist.\n */\nexport function findUppermostFullyOpenRect(\n  bands: Band[],\n  rect: Rect,\n): Rect | null {\n  if (!bands.length) {\n    return rect;\n  }\n  let topEdge = rect.y1;\n  let band: Band;\n  let i: number;\n  for (i = 0; i < bands.length; i++) {\n    band = bands[i];\n    if (\n      band.y2 > rect.y1 &&\n      band.x1 - 0.1 <= rect.x1 &&\n      band.x2 + 0.1 >= rect.x2\n    ) {\n      break;\n    } else {\n      topEdge = Math.max(topEdge, band.y2);\n    }\n  }\n  let bottomEdge = topEdge;\n  for (; i < bands.length; i++) {\n    band = bands[i];\n    if (\n      band.y1 >= rect.y2 ||\n      band.x1 - 0.1 > rect.x1 ||\n      band.x2 + 0.1 < rect.x2\n    ) {\n      break;\n    } else {\n      bottomEdge = band.y2;\n    }\n  }\n  if (i === bands.length) {\n    bottomEdge = rect.y2;\n  } else {\n    bottomEdge = Math.min(bottomEdge, rect.y2);\n  }\n  if (bottomEdge <= topEdge) {\n    return null;\n  } else {\n    return new Rect(rect.x1, topEdge, rect.x2, bottomEdge);\n  }\n}\n\n/**\n * Find the bottommost rectangle contained in the specified rect which occupies\n * full width of the rect without overlapping with any band in the specified\n * bands.\n * @returns Returns null if such rectangle does not exist.\n */\nexport function findBottommostFullyOpenRect(\n  bands: Band[],\n  rect: Rect,\n): Rect | null {\n  if (!bands.length) {\n    return rect;\n  }\n  let bottomEdge = rect.y2;\n  let band: Band;\n  let i: number;\n  for (i = bands.length - 1; i >= 0; i--) {\n    band = bands[i];\n    if (i === bands.length - 1 && band.y2 < rect.y2) {\n      break;\n    } else if (\n      band.y1 < rect.y2 &&\n      band.x1 - 0.1 <= rect.x1 &&\n      band.x2 + 0.1 >= rect.x2\n    ) {\n      break;\n    } else {\n      bottomEdge = Math.min(bottomEdge, band.y1);\n    }\n  }\n  let topEdge = Math.min(bottomEdge, band.y2);\n  for (; i >= 0; i--) {\n    band = bands[i];\n    if (\n      band.y2 <= rect.y1 ||\n      band.x1 - 0.1 > rect.x1 ||\n      band.x2 + 0.1 < rect.x2\n    ) {\n      break;\n    } else {\n      topEdge = band.y1;\n    }\n  }\n  topEdge = Math.max(topEdge, rect.y1);\n  if (bottomEdge <= topEdge) {\n    return null;\n  } else {\n    return new Rect(rect.x1, topEdge, rect.x2, bottomEdge);\n  }\n}\n\n/**\n * @param side either \"left\" or \"right\"\n */\nexport function positionFloat(\n  box: Rect,\n  bands: Band[],\n  floatBox: Rect,\n  side: string,\n): boolean {\n  let y = floatBox.y1;\n  const floatWidth = floatBox.x2 - floatBox.x1;\n  const floatHeight = floatBox.y2 - floatBox.y1;\n  let index = findBand(bands, y);\n  while (true) {\n    // Check if it fits\n    const floatBottom = y + floatHeight;\n    if (floatBottom > box.y2) {\n      return false;\n    }\n\n    // does not fit vertically\n    let x1 = box.x1;\n    let x2 = box.x2;\n    for (let i = index; i < bands.length && bands[i].y1 < floatBottom; i++) {\n      const band = bands[i];\n      if (band.x1 > x1) {\n        x1 = band.x1;\n      }\n      if (band.x2 < x2) {\n        x2 = band.x2;\n      }\n    }\n    if (x1 + floatWidth <= x2 || index >= bands.length) {\n      if (side == \"left\") {\n        floatBox.x1 = x1;\n        floatBox.x2 = x1 + floatWidth;\n      } else {\n        floatBox.x1 = x2 - floatWidth;\n        floatBox.x2 = x2;\n      }\n      floatBox.y2 += y - floatBox.y1;\n      floatBox.y1 = y;\n      return true;\n    }\n    y = bands[index].y2;\n    index++;\n  }\n}\n\nexport function addFloatToBands(\n  box: Rect,\n  bands: Band[],\n  floatBox: Rect,\n  floatBands: Band[],\n  side: string,\n): void {\n  if (!floatBands) {\n    floatBands = [new Band(floatBox.y1, floatBox.y2, floatBox.x1, floatBox.x2)];\n  }\n  while (floatBands.length > 0 && floatBands[0].y2 <= box.y1) {\n    floatBands.shift();\n  }\n  if (floatBands.length == 0) {\n    return;\n  }\n  if (floatBands[0].y1 < box.y1) {\n    floatBands[0].y1 = box.y1;\n  }\n  let band: Band;\n  const lastY = bands.length == 0 ? box.y1 : bands[bands.length - 1].y2;\n  if (lastY < box.y2) {\n    // add the tail band that we typically don't keep, it will be cleared by\n    // normalize()\n    bands.push(new Band(lastY, box.y2, box.x1, box.x2));\n  }\n  let index = findBand(bands, floatBands[0].y1);\n  for (const floatBand of floatBands) {\n    if (index == bands.length) {\n      break;\n    }\n    if (bands[index].y1 < floatBand.y1) {\n      // split it\n      band = bands[index];\n      index++;\n      bands.splice(index, 0, new Band(floatBand.y1, band.y2, band.x1, band.x2));\n      band.y2 = floatBand.y1;\n    }\n    while (index < bands.length) {\n      band = bands[index++];\n      if (band.y2 > floatBand.y2) {\n        // split it\n        bands.splice(\n          index,\n          0,\n          new Band(floatBand.y2, band.y2, band.x1, band.x2),\n        );\n        band.y2 = floatBand.y2;\n      }\n      if (floatBand.x1 != floatBand.x2) {\n        // non-empty floatBand\n        if (side == \"left\") {\n          band.x1 = Math.min(floatBand.x2, box.x2);\n        } else {\n          band.x2 = Math.max(floatBand.x1, box.x1);\n        }\n      }\n      if (band.y2 == floatBand.y2) {\n        break;\n      }\n    }\n  }\n  normalize(box, bands);\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssProp - Support utilities to extract information\n * from various (parsed) CSS values.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as Exprs from \"./exprs\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as Logging from \"./logging\";\n\n//---------------------- value parsers ----------------------------------\nexport class SetVisitor extends Css.Visitor {\n  propSet: { [key: string]: boolean } = {};\n\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    this.propSet[ident.name] = true;\n    return ident;\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    this.visitValues(list.values);\n    return list;\n  }\n}\n\nexport function toSet(val: Css.Val): { [key: string]: boolean } {\n  if (val) {\n    const visitor = new SetVisitor();\n    try {\n      val.visit(visitor);\n      return visitor.propSet;\n    } catch (err) {\n      Logging.logger.warn(err, \"toSet:\");\n    }\n  }\n  return {};\n}\n\nexport class IntVisitor extends Css.Visitor {\n  constructor(public value: number) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  visitInt(num: Css.Int): Css.Val {\n    this.value = num.num;\n    return num;\n  }\n}\n\nexport function toInt(val: Css.Val, def: number): number {\n  if (val) {\n    const visitor = new IntVisitor(def);\n    try {\n      val.visit(visitor);\n      return visitor.value;\n    } catch (err) {\n      Logging.logger.warn(err, \"toInt: \");\n    }\n  }\n  return def;\n}\n\nexport class ShapeVisitor extends Css.Visitor {\n  collect: boolean = false;\n  coords: Css.Numeric[] = [];\n  name: string | null = null;\n\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Css.Numeric): Css.Val {\n    if (this.collect) {\n      this.coords.push(numeric);\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitNum(num: Css.Num): Css.Val {\n    if (this.collect && num.num == 0) {\n      this.coords.push(new Css.Numeric(0, \"px\"));\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    this.visitValues(list.values);\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    if (!this.collect) {\n      this.collect = true;\n      this.visitValues(func.values);\n      this.collect = false;\n      this.name = func.name.toLowerCase();\n    }\n    return null;\n  }\n\n  getShape(\n    x: number,\n    y: number,\n    width: number,\n    height: number,\n    context: Exprs.Context,\n  ): GeometryUtil.Shape {\n    if (this.coords.length > 0) {\n      const numbers: number[] = [];\n      this.coords.forEach((coord, i) => {\n        if (coord.unit == \"%\") {\n          let ref = i % 2 == 0 ? width : height;\n          if (i == 3 && this.name == \"circle\") {\n            ref = Math.sqrt((width * width + height * height) / 2);\n          }\n          numbers.push((coord.num * ref) / 100);\n        } else {\n          numbers.push(coord.num * context.queryUnitSize(coord.unit, false));\n        }\n      });\n      switch (this.name) {\n        case \"polygon\":\n          if (numbers.length % 2 == 0) {\n            const points: GeometryUtil.Point[] = [];\n            for (let k = 0; k < numbers.length; k += 2) {\n              points.push(\n                new GeometryUtil.Point(x + numbers[k], y + numbers[k + 1]),\n              );\n            }\n            return new GeometryUtil.Shape(points);\n          }\n          break;\n        case \"rectangle\":\n          if (numbers.length == 4) {\n            return GeometryUtil.shapeForRect(\n              x + numbers[0],\n              y + numbers[1],\n              x + numbers[0] + numbers[2],\n              y + numbers[1] + numbers[3],\n            );\n          }\n          break;\n        case \"ellipse\":\n          if (numbers.length == 4) {\n            return GeometryUtil.shapeForEllipse(\n              x + numbers[0],\n              y + numbers[1],\n              numbers[2],\n              numbers[3],\n            );\n          }\n          break;\n        case \"circle\":\n          if (numbers.length == 3) {\n            return GeometryUtil.shapeForEllipse(\n              x + numbers[0],\n              y + numbers[1],\n              numbers[2],\n              numbers[2],\n            );\n          }\n          break;\n      }\n    }\n    return null;\n  }\n}\n\nexport function toShape(\n  val: Css.Val,\n  x: number,\n  y: number,\n  width: number,\n  height: number,\n  context: Exprs.Context,\n): GeometryUtil.Shape {\n  if (val) {\n    const visitor = new ShapeVisitor();\n    try {\n      val.visit(visitor);\n      return visitor.getShape(x, y, width, height, context);\n    } catch (err) {\n      Logging.logger.warn(err, \"toShape:\");\n    }\n  }\n  return GeometryUtil.shapeForRect(x, y, x + width, y + height);\n}\n\nexport class CountersVisitor extends Css.Visitor {\n  counters: { [key: string]: number } = {};\n  name: string | null = null;\n\n  constructor(public readonly reset: boolean) {\n    super();\n  }\n\n  /** @override */\n  visitIdent(ident: Css.Ident): Css.Val {\n    this.name = ident.toString();\n    if (this.reset) {\n      this.counters[this.name] = 0;\n    } else {\n      this.counters[this.name] = (this.counters[this.name] || 0) + 1;\n    }\n    return ident;\n  }\n\n  /** @override */\n  visitInt(num: Css.Int): Css.Val {\n    if (this.name) {\n      this.counters[this.name] += num.num - (this.reset ? 0 : 1);\n    }\n    return num;\n  }\n\n  /** @override */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    this.visitValues(list.values);\n    return list;\n  }\n}\n\nexport function toCounters(\n  val: Css.Val,\n  reset: boolean,\n): { [key: string]: number } {\n  const visitor = new CountersVisitor(reset);\n  try {\n    val.visit(visitor);\n  } catch (err) {\n    Logging.logger.warn(err, \"toCounters:\");\n  }\n  return visitor.counters;\n}\n\nexport class UrlTransformVisitor extends Css.FilterVisitor {\n  constructor(\n    public baseUrl: string,\n    public transformer: Base.DocumentURLTransformer,\n  ) {\n    super();\n  }\n\n  /** @override */\n  visitURL(url: Css.URL): Css.Val {\n    return new Css.URL(this.transformer.transformURL(url.url, this.baseUrl));\n  }\n}\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Counters\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssStyler from \"./css-styler\";\nimport * as Exprs from \"./exprs\";\nimport * as Vgen from \"./vgen\";\nimport * as Vtree from \"./vtree\";\nimport { Layout } from \"./types\";\n\n/**\n * Clone counter values.\n */\nfunction cloneCounterValues(\n  counters: CssCascade.CounterValues,\n): CssCascade.CounterValues {\n  const result = {};\n  Object.keys(counters).forEach((name) => {\n    result[name] = Array.from(counters[name]);\n  });\n  return result;\n}\n\n/**\n * Class representing a reference by target-counter(s).\n * @param targetId ID of the referenced element (transformed by\n *     DocumentURLTransformer to handle a reference across multiple source\n *     documents)\n * @param resolved If the reference is already resolved or not\n */\nexport class TargetCounterReference {\n  pageCounters: CssCascade.CounterValues = null;\n  spineIndex: number = -1;\n  pageIndex: number = -1;\n\n  constructor(public readonly targetId: string, public resolved: boolean) {}\n\n  equals(other: TargetCounterReference): boolean {\n    if (this === other) {\n      return true;\n    }\n    if (!other) {\n      return false;\n    }\n    return (\n      this.targetId === other.targetId &&\n      this.resolved === other.resolved &&\n      this.spineIndex === other.spineIndex &&\n      this.pageIndex === other.pageIndex\n    );\n  }\n\n  /**\n   * Returns if the reference is resolved or not.\n   */\n  isResolved(): boolean {\n    return this.resolved;\n  }\n\n  /**\n   * Marks that this reference is resolved.\n   */\n  resolve() {\n    this.resolved = true;\n  }\n\n  /**\n   * Marks that this reference is unresolved.\n   */\n  unresolve() {\n    this.resolved = false;\n  }\n}\n\nclass CounterListener implements CssCascade.CounterListener {\n  constructor(\n    public readonly counterStore: CounterStore,\n    public readonly baseURL: string,\n  ) {}\n\n  /**\n   * @override\n   */\n  countersOfId(id: string, counters: CssCascade.CounterValues) {\n    id = this.counterStore.documentURLTransformer.transformFragment(\n      id,\n      this.baseURL,\n    );\n    this.counterStore.countersById[id] = counters;\n  }\n\n  getExprContentListener(): Vtree.ExprContentListener {\n    return this.counterStore.getExprContentListener();\n  }\n}\n\nclass CounterResolver implements CssCascade.CounterResolver {\n  styler: CssStyler.Styler | null = null;\n\n  constructor(\n    public readonly counterStore: CounterStore,\n    public readonly baseURL: string,\n    public readonly rootScope: Exprs.LexicalScope,\n    public readonly pageScope: Exprs.LexicalScope,\n  ) {}\n\n  setStyler(styler: CssStyler.Styler) {\n    this.styler = styler;\n  }\n\n  private getFragment(url: string): string | null {\n    const r = url.match(/^[^#]*#(.*)$/);\n    return r ? r[1] : null;\n  }\n\n  private getTransformedId(url: string): string {\n    let transformedId = this.counterStore.documentURLTransformer.transformURL(\n      Base.resolveURL(url, this.baseURL),\n      this.baseURL,\n    );\n    if (transformedId.charAt(0) === \"#\") {\n      transformedId = transformedId.substring(1);\n    }\n    return transformedId;\n  }\n\n  /**\n   * @override\n   */\n  getPageCounterVal(\n    name: string,\n    format: (p1: number | null) => string,\n  ): Exprs.Val {\n    const self = this;\n\n    function getCounterNumber() {\n      const values = self.counterStore.currentPageCounters[name];\n      return values && values.length ? values[values.length - 1] : null;\n    }\n    const expr = new Exprs.Native(\n      this.pageScope,\n      () => format(getCounterNumber()),\n      `page-counter-${name}`,\n    );\n\n    function arrayFormat(arr) {\n      return format(arr[0]);\n    }\n    this.counterStore.registerPageCounterExpr(name, arrayFormat, expr);\n    return expr;\n  }\n\n  /**\n   * @override\n   */\n  getPageCountersVal(\n    name: string,\n    format: (p1: number[]) => string,\n  ): Exprs.Val {\n    const self = this;\n\n    function getCounterNumbers() {\n      return self.counterStore.currentPageCounters[name] || [];\n    }\n    const expr = new Exprs.Native(\n      this.pageScope,\n      () => format(getCounterNumbers()),\n      `page-counters-${name}`,\n    );\n    this.counterStore.registerPageCounterExpr(name, format, expr);\n    return expr;\n  }\n\n  /**\n   * Returns (non page-based) counter values for an element with the specified\n   * ID. Returns null if the style of the elements has not been calculated yet\n   * (i.e. the element does not exit or it is in a source document which is not\n   * loaded yet).\n   * @param id Original ID value\n   * @param transformedId ID transformed by DocumentURLTransformer to handle a\n   *     reference across multiple source documents\n   * @param lookForElement If true, look ahead for an element with the ID in the\n   *     current source document when such an element has not appeared yet. Do\n   *     not set to true during Styler.styleUntil is being called, since in that\n   *     case Styler.styleUntil can be called again and may lead to internal\n   *     inconsistency.\n   */\n  private getTargetCounters(\n    id: string | null,\n    transformedId: string,\n    lookForElement: boolean,\n  ): CssCascade.CounterValues | null {\n    let targetCounters = this.counterStore.countersById[transformedId];\n    if (!targetCounters && lookForElement && id) {\n      this.styler.styleUntilIdIsReached(id);\n      targetCounters = this.counterStore.countersById[transformedId];\n    }\n    return targetCounters || null;\n  }\n\n  /**\n   * Returns page-based counter values for an element with the specified ID.\n   * Returns null if the element has not been laid out yet.\n   * @param transformedId ID transformed by DocumentURLTransformer to handle a\n   *     reference across multiple source documents\n   */\n  private getTargetPageCounters(\n    transformedId: string,\n  ): CssCascade.CounterValues | null {\n    if (this.counterStore.currentPage.elementsById[transformedId]) {\n      return this.counterStore.currentPageCounters;\n    } else {\n      return this.counterStore.pageCountersById[transformedId] || null;\n    }\n  }\n\n  /**\n   * @override\n   */\n  getTargetCounterVal(\n    url: string,\n    name: string,\n    format: (p1: number | null) => string,\n  ): Exprs.Val {\n    const id = this.getFragment(url);\n    const transformedId = this.getTransformedId(url);\n\n    // Since this method is executed during Styler.styleUntil is being called,\n    // set false to lookForElement argument.\n    let counters = this.getTargetCounters(id, transformedId, false);\n    if (counters && counters[name]) {\n      // Since an element-based counter is defined, any page-based counter is\n      // obscured even if it exists.\n      const countersOfName = counters[name];\n      return new Exprs.Const(\n        this.rootScope,\n        format(countersOfName[countersOfName.length - 1] || null),\n      );\n    }\n    const self = this;\n    return new Exprs.Native(\n      this.pageScope,\n      () => {\n        // Since This block is evaluated during layout, lookForElement\n        // argument can be set to true.\n        counters = self.getTargetCounters(id, transformedId, true);\n\n        if (counters) {\n          if (counters[name]) {\n            // Since an element-based counter is defined, any page-based\n            // counter is obscured even if it exists.\n            const countersOfName = counters[name];\n            return format(countersOfName[countersOfName.length - 1] || null);\n          } else {\n            const pageCounters = self.getTargetPageCounters(transformedId);\n            if (pageCounters) {\n              // The target element has already been laid out.\n              self.counterStore.resolveReference(transformedId);\n              if (pageCounters[name]) {\n                const pageCountersOfName = pageCounters[name];\n                return format(\n                  pageCountersOfName[pageCountersOfName.length - 1] || null,\n                );\n              } else {\n                // No corresponding counter with the name.\n                return format(0);\n              }\n            } else {\n              // The target element has not been laid out yet.\n              self.counterStore.saveReferenceOfCurrentPage(\n                transformedId,\n                false,\n              );\n              return \"??\"; // TODO more reasonable placeholder?\n            }\n          }\n        } else {\n          // The style of target element has not been calculated yet.\n          // (The element is in another source document that is not parsed\n          // yet)\n          self.counterStore.saveReferenceOfCurrentPage(transformedId, false);\n          return \"??\"; // TODO more reasonable placeholder?\n        }\n      },\n      `target-counter-${name}-of-${url}`,\n    );\n  }\n\n  /**\n   * @override\n   */\n  getTargetCountersVal(\n    url: string,\n    name: string,\n    format: (p1: number[]) => string,\n  ): Exprs.Val {\n    const id = this.getFragment(url);\n    const transformedId = this.getTransformedId(url);\n    const self = this;\n    return new Exprs.Native(\n      this.pageScope,\n      () => {\n        const pageCounters = self.getTargetPageCounters(transformedId);\n\n        if (!pageCounters) {\n          // The target element has not been laid out yet.\n          self.counterStore.saveReferenceOfCurrentPage(transformedId, false);\n          return \"??\"; // TODO more reasonable placeholder?\n        } else {\n          self.counterStore.resolveReference(transformedId);\n          const pageCountersOfName = pageCounters[name] || [];\n          const elementCounters = self.getTargetCounters(\n            id,\n            transformedId,\n            true,\n          );\n          const elementCountersOfName = elementCounters[name] || [];\n          return format(pageCountersOfName.concat(elementCountersOfName));\n        }\n      },\n      `target-counters-${name}-of-${url}`,\n    );\n  }\n}\n\nexport class CounterStore {\n  countersById: { [key: string]: CssCascade.CounterValues } = {};\n  pageCountersById: { [key: string]: CssCascade.CounterValues } = {};\n  currentPageCounters: CssCascade.CounterValues = {};\n  previousPageCounters: CssCascade.CounterValues = {};\n  currentPageCountersStack: CssCascade.CounterValues[] = [];\n  pageIndicesById: {\n    [key: string]: { spineIndex: number; pageIndex: number };\n  } = {};\n  currentPage: Vtree.Page = null;\n  newReferencesOfCurrentPage: TargetCounterReference[] = [];\n  referencesToSolve: TargetCounterReference[] = [];\n  referencesToSolveStack: TargetCounterReference[][] = [];\n  unresolvedReferences: { [key: string]: TargetCounterReference[] } = {};\n  resolvedReferences: { [key: string]: TargetCounterReference[] } = {};\n  private pagesCounterExprs: {\n    expr: Exprs.Val;\n    format: (p1: number[]) => string;\n  }[] = [];\n\n  constructor(\n    public readonly documentURLTransformer: Base.DocumentURLTransformer,\n  ) {\n    this.currentPageCounters[\"page\"] = [0];\n  }\n\n  createCounterListener(baseURL: string): CssCascade.CounterListener {\n    return new CounterListener(this, baseURL);\n  }\n\n  createCounterResolver(\n    baseURL: string,\n    rootScope: Exprs.LexicalScope,\n    pageScope: Exprs.LexicalScope,\n  ): CssCascade.CounterResolver {\n    return new CounterResolver(this, baseURL, rootScope, pageScope);\n  }\n\n  setCurrentPage(page: Vtree.Page) {\n    this.currentPage = page;\n  }\n\n  private definePageCounter(counterName: string, value: number) {\n    if (this.currentPageCounters[counterName]) {\n      this.currentPageCounters[counterName].push(value);\n    } else {\n      this.currentPageCounters[counterName] = [value];\n    }\n  }\n\n  /**\n   * Forcefully set the `page` page-based counter to the specified value.\n   */\n  forceSetPageCounter(pageNumber: number) {\n    const counters = this.currentPageCounters[\"page\"];\n    if (!counters || !counters.length) {\n      this.currentPageCounters[\"page\"] = [pageNumber];\n    } else {\n      counters[counters.length - 1] = pageNumber;\n    }\n  }\n\n  /**\n   * Update the page-based counters with 'counter-reset' and 'counter-increment'\n   * properties within the page context. Call before starting layout of the\n   * page.\n   */\n  updatePageCounters(\n    cascadedPageStyle: CssCascade.ElementStyle,\n    context: Exprs.Context,\n  ) {\n    // Save page counters to previousPageCounters before updating\n    this.previousPageCounters = cloneCounterValues(this.currentPageCounters);\n    let resetMap: { [key: string]: number };\n    const reset = cascadedPageStyle[\"counter-reset\"];\n    if (reset) {\n      const resetVal = reset.evaluate(context);\n      if (resetVal) {\n        resetMap = CssProp.toCounters(resetVal, true);\n      }\n    }\n    if (resetMap) {\n      for (const resetCounterName in resetMap) {\n        this.definePageCounter(resetCounterName, resetMap[resetCounterName]);\n      }\n    }\n    let incrementMap: { [key: string]: number };\n    const increment = cascadedPageStyle[\"counter-increment\"];\n    if (increment) {\n      const incrementVal = increment.evaluate(context);\n      if (incrementVal) {\n        incrementMap = CssProp.toCounters(incrementVal, false);\n      }\n    }\n\n    // If 'counter-increment' for the builtin 'page' counter is absent, add it\n    // with value 1.\n    if (incrementMap) {\n      if (!(\"page\" in incrementMap)) {\n        incrementMap[\"page\"] = 1;\n      }\n    } else {\n      incrementMap = {};\n      incrementMap[\"page\"] = 1;\n    }\n    for (const incrementCounterName in incrementMap) {\n      if (!this.currentPageCounters[incrementCounterName]) {\n        this.definePageCounter(incrementCounterName, 0);\n      }\n      const counterValues = this.currentPageCounters[incrementCounterName];\n      counterValues[counterValues.length - 1] +=\n        incrementMap[incrementCounterName];\n    }\n  }\n\n  /**\n   * Save current page-based counters values and set them to the values passed\n   * in. The saved counter values can be restored by popPageCounters method.\n   */\n  pushPageCounters(counters: CssCascade.CounterValues) {\n    this.currentPageCountersStack.push(this.currentPageCounters);\n    this.currentPageCounters = cloneCounterValues(counters);\n  }\n\n  /**\n   * Restore previously saved page-based counter values.\n   */\n  popPageCounters() {\n    this.currentPageCounters = this.currentPageCountersStack.pop();\n  }\n\n  /**\n   * Resolve a reference with the specified ID.\n   */\n  resolveReference(id: string) {\n    const unresolvedRefs = this.unresolvedReferences[id];\n    let resolvedRefs = this.resolvedReferences[id];\n    if (!resolvedRefs) {\n      resolvedRefs = this.resolvedReferences[id] = [];\n    }\n    let pushed = false;\n    for (let i = 0; i < this.referencesToSolve.length; ) {\n      const ref = this.referencesToSolve[i];\n      if (ref.targetId === id) {\n        ref.resolve();\n        this.referencesToSolve.splice(i, 1);\n        if (unresolvedRefs) {\n          const j = unresolvedRefs.indexOf(ref);\n          if (j >= 0) {\n            unresolvedRefs.splice(j, 1);\n          }\n        }\n        resolvedRefs.push(ref);\n        pushed = true;\n      } else {\n        i++;\n      }\n    }\n    if (!pushed) {\n      this.saveReferenceOfCurrentPage(id, true);\n    }\n  }\n\n  /**\n   * Save a reference appeared in the current page.\n   * @param resolved If the reference is already resolved or not.\n   */\n  saveReferenceOfCurrentPage(id: string, resolved: boolean) {\n    if (!this.newReferencesOfCurrentPage.some((ref) => ref.targetId === id)) {\n      const ref = new TargetCounterReference(id, resolved);\n      this.newReferencesOfCurrentPage.push(ref);\n    }\n  }\n\n  /**\n   * Finish the current page; elements with ID are collected and saved with\n   * current page-based counter values internally.\n   * @param spineIndex Index of the currently laid out spine item\n   * @param pageIndex Index of the currently laid out page in its spine item\n   */\n  finishPage(spineIndex: number, pageIndex: number) {\n    const ids = Object.keys(this.currentPage.elementsById);\n    if (ids.length > 0) {\n      const currentPageCounters = cloneCounterValues(this.currentPageCounters);\n      ids.forEach((id) => {\n        this.pageCountersById[id] = currentPageCounters;\n        const oldPageIndex = this.pageIndicesById[id];\n        if (oldPageIndex && oldPageIndex.pageIndex < pageIndex) {\n          const resolvedRefs = this.resolvedReferences[id];\n          if (resolvedRefs) {\n            let unresolvedRefs = this.unresolvedReferences[id];\n            if (!unresolvedRefs) {\n              unresolvedRefs = this.unresolvedReferences[id] = [];\n            }\n            let ref: TargetCounterReference;\n            while ((ref = resolvedRefs.shift())) {\n              ref.unresolve();\n              unresolvedRefs.push(ref);\n            }\n          }\n        }\n        this.pageIndicesById[id] = { spineIndex, pageIndex };\n      });\n    }\n    const prevPageCounters = this.previousPageCounters;\n    let ref: TargetCounterReference;\n    while ((ref = this.newReferencesOfCurrentPage.shift())) {\n      ref.pageCounters = prevPageCounters;\n      ref.spineIndex = spineIndex;\n      ref.pageIndex = pageIndex;\n      let arr: TargetCounterReference[];\n      if (ref.isResolved()) {\n        arr = this.resolvedReferences[ref.targetId];\n        if (!arr) {\n          arr = this.resolvedReferences[ref.targetId] = [];\n        }\n      } else {\n        arr = this.unresolvedReferences[ref.targetId];\n        if (!arr) {\n          arr = this.unresolvedReferences[ref.targetId] = [];\n        }\n      }\n      if (arr.every((r) => !ref.equals(r))) {\n        arr.push(ref);\n      }\n    }\n    this.currentPage = null;\n  }\n\n  /**\n   * Returns unresolved references pointing to the specified page.\n   */\n  getUnresolvedRefsToPage(\n    page: Vtree.Page,\n  ): {\n    spineIndex: number;\n    pageIndex: number;\n    pageCounters: CssCascade.CounterValues;\n    refs: TargetCounterReference[];\n  }[] {\n    let refs: TargetCounterReference[] = [];\n    const ids = Object.keys(page.elementsById);\n    ids.forEach((id) => {\n      const idRefs = this.unresolvedReferences[id];\n      if (idRefs) {\n        refs = refs.concat(idRefs);\n      }\n    });\n    refs.sort(\n      (r1, r2) => r1.spineIndex - r2.spineIndex || r1.pageIndex - r2.pageIndex,\n    );\n    const result: {\n      spineIndex: number;\n      pageIndex: number;\n      pageCounters: CssCascade.CounterValues;\n      refs: TargetCounterReference[];\n    }[] = [];\n    let o: {\n      spineIndex: number;\n      pageIndex: number;\n      pageCounters: CssCascade.CounterValues;\n      refs: TargetCounterReference[];\n    } = null;\n    refs.forEach((ref) => {\n      if (\n        !o ||\n        o.spineIndex !== ref.spineIndex ||\n        o.pageIndex !== ref.pageIndex\n      ) {\n        o = {\n          spineIndex: ref.spineIndex,\n          pageIndex: ref.pageIndex,\n          pageCounters: ref.pageCounters,\n          refs: [ref],\n        };\n        result.push(o);\n      } else {\n        o.refs.push(ref);\n      }\n    });\n    return result;\n  }\n\n  /**\n   * Save current references to solve and set them to the values passed in.\n   * The saved references can be restored by popReferencesToSolve method.\n   */\n  pushReferencesToSolve(refs: TargetCounterReference[]) {\n    this.referencesToSolveStack.push(this.referencesToSolve);\n    this.referencesToSolve = refs;\n  }\n\n  /**\n   * Restore previously saved references to solve.\n   */\n  popReferencesToSolve() {\n    this.referencesToSolve = this.referencesToSolveStack.pop();\n  }\n\n  registerPageCounterExpr(\n    name: string,\n    format: (p1: number[]) => string,\n    expr: Exprs.Val,\n  ) {\n    if (name === \"pages\") {\n      this.pagesCounterExprs.push({ expr, format });\n    }\n  }\n\n  getExprContentListener(): Vtree.ExprContentListener {\n    return this.exprContentListener.bind(this);\n  }\n\n  private exprContentListener(expr, val, document) {\n    const found = this.pagesCounterExprs.findIndex((o) => o.expr === expr) >= 0;\n    if (found) {\n      const node = document.createElement(\"span\");\n      node.textContent = val;\n      node.setAttribute(PAGES_COUNTER_ATTR, expr.key);\n      return node;\n    } else {\n      return null;\n    }\n  }\n\n  finishLastPage(viewport: Vgen.Viewport) {\n    const nodes = viewport.root.querySelectorAll(`[${PAGES_COUNTER_ATTR}]`);\n    const pages = this.currentPageCounters[\"page\"][0];\n    Array.from(nodes).forEach((node) => {\n      const key = node.getAttribute(PAGES_COUNTER_ATTR);\n      const i = this.pagesCounterExprs.findIndex((o) => o.expr.key === key);\n      Asserts.assert(i >= 0);\n      node.textContent = this.pagesCounterExprs[i].format([pages]);\n    });\n  }\n\n  createLayoutConstraint(pageIndex: number): Layout.LayoutConstraint {\n    return new LayoutConstraint(this, pageIndex);\n  }\n}\n\nexport const PAGES_COUNTER_ATTR = \"data-vivliostyle-pages-counter\";\n\nclass LayoutConstraint implements Layout.LayoutConstraint {\n  constructor(\n    public readonly counterStore: CounterStore,\n    public readonly pageIndex: number,\n  ) {}\n\n  /**\n   * @override\n   */\n  allowLayout(nodeContext: Vtree.NodeContext): boolean {\n    if (!nodeContext || nodeContext.after) {\n      return true;\n    }\n    const viewNode = nodeContext.viewNode;\n    if (!viewNode || viewNode.nodeType !== 1) {\n      return true;\n    }\n    const id =\n      (viewNode as Element).getAttribute(\"id\") ||\n      (viewNode as Element).getAttribute(\"name\");\n    if (!id) {\n      return true;\n    }\n    if (\n      !this.counterStore.resolvedReferences[id] &&\n      !this.counterStore.unresolvedReferences[id]\n    ) {\n      return true;\n    }\n    const pageIndex = this.counterStore.pageIndicesById[id];\n    if (!pageIndex) {\n      return true;\n    }\n    return this.pageIndex >= pageIndex.pageIndex;\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2017 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssTokenizer - CSS Tokenizer.\n */\n\nexport interface TokenizerHandler {\n  error(mnemonics: string, token: Token): void;\n}\n\nexport function escapeParseSingle(str: string): string {\n  str = str.substr(1);\n  if (str.match(/^[^0-9a-fA-F\\n\\r]$/)) {\n    return str;\n  }\n  const code = parseInt(str, 16);\n  if (isNaN(code)) {\n    return \"\";\n  }\n  if (code <= 65535) {\n    return String.fromCharCode(code);\n  }\n  if (code <= 1114111) {\n    // non-BMP characters: convert to a surrogate pair\n    return String.fromCharCode(\n      55296 | ((code >> 10) & 1023),\n      56320 | (code & 1023),\n    );\n  }\n\n  // not a valid Unicode value\n  return \"\\ufffd\";\n}\n\nexport function escapeParse(str: string): string {\n  return str.replace(\n    /\\\\([0-9a-fA-F]{0,6}(\\r\\n|[ \\n\\r\\t\\f])?|[^0-9a-fA-F\\n\\r])/g,\n    escapeParseSingle,\n  );\n}\n\n/**\n * @enum {number}\n */\nexport enum TokenType {\n  EOF,\n  IDENT,\n  STR,\n  NUMERIC,\n  NUM,\n  INT,\n  FUNC,\n  HASH,\n  URL,\n  CLASS,\n  O_PAR,\n  C_PAR,\n  O_BRC,\n  C_BRC,\n  O_BRK,\n  C_BRK,\n  COMMA,\n  SEMICOL,\n  COLON,\n  SLASH,\n  AT,\n  PERCENT,\n  QMARK,\n  PLUS,\n  MINUS,\n  BAR_BAR,\n  AMP_AMP,\n\n  // those can have \"=\" at the end\n  BANG = 31,\n  DOLLAR,\n  HAT,\n  BAR,\n  TILDE,\n  STAR,\n  GT,\n  LT,\n  EQ,\n\n  // tokens above plus \"=\" at the end, order must be the same\n  BANG_EQ = 41,\n  DOLLAR_EQ,\n  HAT_EQ,\n  BAR_EQ,\n  TILDE_EQ,\n  STAR_EQ,\n  GT_EQ,\n  LT_EQ,\n  EQ_EQ,\n  COL_COL,\n  INVALID,\n  LAST = 51,\n}\n\nexport class Token {\n  type: TokenType;\n  precededBySpace: boolean = false;\n  num: number = 0;\n  text: string = \"\";\n  position: number = 0;\n\n  constructor() {\n    this.type = TokenType.EOF;\n  }\n}\n\n/**\n * @enum {number}\n */\nexport enum Action {\n  SPACE = 1,\n  INT,\n  IDENT,\n  BANG,\n  HASH = 6,\n  DOLLAR,\n  PERCENT,\n  AMP,\n  O_PAR,\n  C_PAR,\n  STAR,\n  PLUS,\n  COMMA,\n  MINUS,\n  DOT,\n  SLASH,\n  COLON,\n  SEMICOL,\n  LT,\n  EQ,\n  GT,\n  QMARK,\n  AT,\n  O_BRK,\n  C_BRK,\n  O_BRC,\n  C_BRC,\n  BSLASH,\n  HAT,\n  BAR,\n  TILDE,\n  STR1,\n  STR2,\n  END,\n  EQTAIL,\n  ENDINT,\n  ENDNUM,\n  CONT,\n  UNIT,\n  PCUNIT,\n  NUMBER,\n  ENDIDNT,\n  IDNTESC,\n  ENDIDES,\n\n  // end of identifier with escapes\n  ENDSTR,\n  ENDESTR,\n\n  // end of string with escapes\n  STR1ESC,\n  STR2ESC,\n  BAR_BAR,\n  AMP_AMP,\n  FUNC,\n  FUNCES,\n  COMMENT,\n  COMMST,\n  ENDNOTK,\n  MINMIN,\n  TOINT,\n  TONUM,\n  TOIDENT,\n  TOIDES,\n  KILL1,\n  KILL2,\n  URL,\n  URL1,\n  URL2,\n  ENDURL,\n  TERMURL,\n  FINURL,\n  LT_BG,\n  LT_BG_M,\n  INVALID,\n  CHKPOSS,\n  CHKPOSN,\n  URLESC,\n  IDESCH,\n  COL_COL,\n  TOCLASS,\n  CHKSP,\n  EOF,\n}\n\nexport function makeActions(def: Action, spec: Action[]): Action[] {\n  const a: number[] = Array(128);\n  let i: number;\n  for (i = 0; i < 128; i++) {\n    a[i] = def;\n  }\n  a[NaN] = def == Action.END ? Action.END : Action.INVALID;\n  for (i = 0; i < spec.length; i += 2) {\n    a[spec[i]] = spec[i + 1];\n  }\n  return a;\n}\n\n/**\n * Start of the token.\n */\nexport const actionsNormal: Action[] = [\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x00-0x07\n  Action.INVALID,\n  Action.SPACE,\n  Action.SPACE,\n  Action.INVALID,\n  Action.SPACE,\n  Action.SPACE,\n  Action.INVALID,\n  Action.INVALID, // 0x08-0x0F\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x10-0x17\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x18-0x1F\n  Action.SPACE,\n  Action.BANG,\n  Action.STR2,\n  Action.HASH,\n  Action.DOLLAR,\n  Action.PERCENT,\n  Action.AMP,\n  Action.STR1, // 0x20-0x27\n  Action.O_PAR,\n  Action.C_PAR,\n  Action.STAR,\n  Action.PLUS,\n  Action.COMMA,\n  Action.MINUS,\n  Action.DOT,\n  Action.SLASH, // 0x28-0x2F\n  Action.INT,\n  Action.INT,\n  Action.INT,\n  Action.INT,\n  Action.INT,\n  Action.INT,\n  Action.INT,\n  Action.INT, // 0x30-0x37\n  Action.INT,\n  Action.INT,\n  Action.COLON,\n  Action.SEMICOL,\n  Action.LT,\n  Action.EQ,\n  Action.GT,\n  Action.QMARK, // 0x38-0x3F\n  Action.AT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x40-0x47\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x48-0x4F\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x50-0x57\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.O_BRK,\n  Action.BSLASH,\n  Action.C_BRK,\n  Action.HAT,\n  Action.IDENT, // 0x58-0x5F\n  Action.INVALID,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x60-0x67\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x68-0x6F\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT, // 0x70-0x77\n  Action.IDENT,\n  Action.IDENT,\n  Action.IDENT,\n  Action.O_BRC,\n  Action.BAR,\n  Action.C_BRC,\n  Action.TILDE,\n  Action.INVALID, // 0x78-0x7F\n];\n\nactionsNormal[NaN] = Action.EOF;\n\n/**\n * Inside identifier.\n */\nexport const actionsIdent: Action[] = [\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x00-0x07\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x08-0x0F\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x10-0x17\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x18-0x1F\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x20-0x27\n  Action.FUNC,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.CONT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x28-0x2F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x30-0x37\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x38-0x3F\n  Action.ENDIDNT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x40-0x47\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x48-0x4F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x50-0x57\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDNT,\n  Action.IDNTESC,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.CONT, // 0x58-0x5F\n  Action.ENDIDNT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x60-0x67\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x68-0x6F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x70-0x77\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT,\n  Action.ENDIDNT, // 0x78-0x7F\n];\n\nactionsIdent[NaN] = Action.ENDIDNT;\n\n/**\n * After dot (either .class or .123)\n */\nexport const actionsNumOrClass: Action[] = [\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x00-0x07\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x08-0x0F\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x10-0x17\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x18-0x1F\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x20-0x27\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.TOCLASS,\n  Action.TONUM,\n  Action.INVALID, // 0x28-0x2F\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM,\n  Action.TONUM, // 0x30-0x37\n  Action.TONUM,\n  Action.TONUM,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x38-0x3F\n  Action.INVALID,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x40-0x47\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x48-0x4F\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x50-0x57\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.INVALID,\n  Action.TOIDES,\n  Action.INVALID,\n  Action.INVALID,\n  Action.TOCLASS, // 0x58-0x5F\n  Action.INVALID,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x60-0x67\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x68-0x6F\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS, // 0x70-0x77\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.TOCLASS,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID,\n  Action.INVALID, // 0x78-0x7F\n];\n\nactionsIdent[NaN] = Action.ENDIDNT;\n\n/**\n * after '-'\n */\nexport const actionsMinus: Action[] = [\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x00-0x07\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x08-0x0F\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x10-0x17\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x18-0x1F\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x20-0x27\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.MINMIN,\n  Action.TONUM,\n  Action.END, // 0x28-0x2F\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT,\n  Action.TOINT, // 0x30-0x37\n  Action.TOINT,\n  Action.TOINT,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x38-0x3F\n  Action.END,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x40-0x47\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x48-0x4F\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x50-0x57\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.END,\n  Action.TOIDES,\n  Action.END,\n  Action.END,\n  Action.TOIDENT, // 0x58-0x5F\n  Action.END,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x60-0x67\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x68-0x6F\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT, // 0x70-0x77\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.TOIDENT,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END,\n  Action.END, // 0x78-0x7F\n];\n\nactionsMinus[NaN] = Action.END;\n\n/**\n * Inside identifier with escape sequence\n */\nexport const actionsIdentEsc: Action[] = [\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x00-0x07\n  Action.ENDIDES,\n  Action.CHKPOSS,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x08-0x0F\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x10-0x17\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x18-0x1F\n  Action.CHKPOSS,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x20-0x27\n  Action.FUNCES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x28-0x2F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x30-0x37\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x38-0x3F\n  Action.ENDIDES,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x40-0x47\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x48-0x4F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x50-0x57\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDES,\n  Action.IDNTESC,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.CONT, // 0x58-0x5F\n  Action.ENDIDES,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x60-0x67\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x68-0x6F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x70-0x77\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES,\n  Action.ENDIDES, // 0x78-0x7F\n];\n\nactionsIdentEsc[NaN] = Action.ENDIDES;\n\n/**\n * Inside integer\n */\nexport const actionsInt: Action[] = [\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x00-0x07\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x08-0x0F\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x10-0x17\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x18-0x1F\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.PCUNIT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x20-0x27\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.NUMBER,\n  Action.ENDINT, // 0x28-0x2F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x30-0x37\n  Action.CONT,\n  Action.CONT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x38-0x3F\n  Action.ENDINT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x40-0x47\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x48-0x4F\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x50-0x57\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.UNIT, // 0x58-0x5F\n  Action.ENDINT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x60-0x67\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x68-0x6F\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x70-0x77\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT,\n  Action.ENDINT, // 0x78-0x7F\n];\n\nactionsInt[NaN] = Action.ENDINT;\n\n/**\n * inside real, after dot\n */\nexport const actionsNumber: Action[] = [\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x00-0x07\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x08-0x0F\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x10-0x17\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x18-0x1F\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.PCUNIT,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x20-0x27\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x28-0x2F\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT,\n  Action.CONT, // 0x30-0x37\n  Action.CONT,\n  Action.CONT,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x38-0x3F\n  Action.ENDNUM,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x40-0x47\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x48-0x4F\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x50-0x57\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.UNIT, // 0x58-0x5F\n  Action.ENDNUM,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x60-0x67\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x68-0x6F\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT, // 0x70-0x77\n  Action.UNIT,\n  Action.UNIT,\n  Action.UNIT,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM,\n  Action.ENDNUM, // 0x78-0x7F\n];\n\nactionsNumber[NaN] = Action.ENDNUM;\n\nexport const actionsCheckEq: Action[] = makeActions(Action.END, [\n  61 /*=*/,\n  Action.EQTAIL,\n]);\n\nexport const actionsColon: Action[] = makeActions(Action.END, [\n  58 /*:*/,\n  Action.COL_COL,\n]);\n\nexport const actionsBar: Action[] = makeActions(Action.END, [\n  61 /*=*/,\n  Action.EQTAIL,\n  124 /*|*/,\n  Action.BAR_BAR,\n]);\n\nexport const actionsAmp: Action[] = makeActions(Action.END, [\n  38 /*&*/,\n  Action.AMP_AMP,\n]);\n\nexport const actionsSlash: Action[] = makeActions(Action.END, [\n  42 /* * */,\n  Action.COMMENT,\n]);\n\nexport const actionsComment: Action[] = makeActions(Action.CONT, [\n  42 /* * */,\n  Action.COMMST,\n]);\n\nexport const actionsCommentStar: Action[] = makeActions(Action.COMMENT, [\n  42 /* * */,\n  Action.COMMST,\n  47 /* / */,\n  Action.ENDNOTK,\n]);\n\nexport const actionsMinusMinus: Action[] = makeActions(Action.KILL1, [\n  62 /* > */,\n  Action.ENDNOTK,\n]);\n\nexport const actionsLt: Action[] = makeActions(Action.END, [\n  61 /*=*/,\n  Action.EQTAIL,\n  33 /*!*/,\n  Action.LT_BG,\n]);\n\nexport const actionsLtBang: Action[] = makeActions(Action.KILL1, [\n  45 /*-*/,\n  Action.LT_BG_M,\n]);\n\nexport const actionsLtBangMinus: Action[] = makeActions(Action.KILL2, [\n  45 /*-*/,\n  Action.ENDNOTK,\n]);\n\nexport const actionsIdentEscChr: Action[] = makeActions(Action.IDESCH, [\n  9 /*tab*/,\n  Action.INVALID,\n  10 /*LF*/,\n  Action.INVALID,\n  13 /*CR*/,\n  Action.INVALID,\n  32 /*sp*/,\n  Action.INVALID,\n]);\n\nexport const actionsStr1: Action[] = makeActions(Action.CONT, [\n  39 /*'*/,\n  Action.ENDSTR,\n  10 /*LF*/,\n  Action.INVALID,\n  13 /*CR*/,\n  Action.INVALID,\n  92 /*\\*/,\n  Action.STR1ESC,\n]);\n\nexport const actionsStr2: Action[] = makeActions(Action.CONT, [\n  34 /*\"*/,\n  Action.ENDSTR,\n  10 /*LF*/,\n  Action.INVALID,\n  13 /*CR*/,\n  Action.INVALID,\n  92 /*\\*/,\n  Action.STR2ESC,\n]);\n\nexport const actionsStr1Esc: Action[] = makeActions(Action.CONT, [\n  39 /*'*/,\n  Action.ENDESTR,\n  10 /*LF*/,\n  Action.CHKPOSN,\n  13 /*CR*/,\n  Action.CHKPOSN,\n  92 /*\\*/,\n  Action.STR1ESC,\n]);\n\nexport const actionsStr2Esc: Action[] = makeActions(Action.CONT, [\n  34 /*\"*/,\n  Action.ENDESTR,\n  10 /*LF*/,\n  Action.CHKPOSN,\n  13 /*CR*/,\n  Action.CHKPOSN,\n  92 /*\\*/,\n  Action.STR2ESC,\n]);\n\nexport const actionsURL: Action[] = makeActions(Action.URL, [\n  9 /*tab*/,\n  Action.CONT,\n  32 /*sp*/,\n  Action.CONT,\n  34 /*\"*/,\n  Action.URL2,\n  39 /*'*/,\n  Action.URL1,\n  41 /*)*/,\n  Action.INVALID,\n  10 /*LF*/,\n  Action.CONT,\n  13 /*CR*/,\n  Action.CONT,\n]);\n\nexport const actionsURLInside: Action[] = makeActions(Action.CONT, [\n  41 /*)*/,\n  Action.ENDURL,\n  9 /*TAB*/,\n  Action.CHKSP,\n  10 /*LF*/,\n  Action.CHKSP,\n  13 /*CR*/,\n  Action.CHKSP,\n  32 /*sp*/,\n  Action.CHKSP,\n  92 /*\\*/,\n  Action.URLESC,\n  40 /*(*/,\n  Action.INVALID,\n  91 /*[*/,\n  Action.INVALID,\n  93 /*]*/,\n  Action.INVALID,\n  123 /*{*/,\n  Action.INVALID,\n  125 /*}*/,\n  Action.INVALID,\n  NaN,\n  Action.ENDURL,\n]);\n\nexport const actionsURLInside1: Action[] = makeActions(Action.CONT, [\n  39 /*'*/,\n  Action.TERMURL,\n  10 /*LF*/,\n  Action.CHKPOSN,\n  13 /*CR*/,\n  Action.CHKPOSN,\n  92 /*\\*/,\n  Action.URLESC,\n  NaN,\n  Action.ENDURL,\n]);\n\nexport const actionsURLInside2: Action[] = makeActions(Action.CONT, [\n  34 /*\"*/,\n  Action.TERMURL,\n  10 /*LF*/,\n  Action.CHKPOSN,\n  13 /*CR*/,\n  Action.CHKPOSN,\n  92 /*\\*/,\n  Action.URLESC,\n  NaN,\n  Action.ENDURL,\n]);\n\nexport const actionsURLTail: Action[] = makeActions(Action.INVALID, [\n  9 /*tab*/,\n  Action.CONT,\n  10 /*LF*/,\n  Action.CONT,\n  13 /*CR*/,\n  Action.CONT,\n  32 /*sp*/,\n  Action.CONT,\n  41 /*)*/,\n  Action.FINURL,\n]);\n\nexport const INITIAL_INDEX_MASK = 15;\n\nexport class Tokenizer {\n  indexMask: number;\n  buffer: Token[];\n  head: number = -1; // saved, occupied if >= 0\n  tail: number = 0; // available, ready to write\n  curr: number = 0; // ready to read\n  position: number = 0;\n\n  constructor(public input: string, public readonly handler: TokenizerHandler) {\n    this.indexMask = INITIAL_INDEX_MASK;\n    this.buffer = Array(this.indexMask + 1);\n    for (let i = 0; i <= this.indexMask; i++) {\n      this.buffer[i] = new Token();\n    }\n  }\n\n  token(): Token {\n    if (this.tail == this.curr) {\n      this.fillBuffer();\n    }\n    return this.buffer[this.curr];\n  }\n\n  nthToken(n: number): Token {\n    if (((this.tail - this.curr) & this.indexMask) <= n) {\n      this.fillBuffer();\n    }\n    return this.buffer[(this.curr + n) & this.indexMask];\n  }\n\n  consume(): void {\n    this.curr = (this.curr + 1) & this.indexMask;\n  }\n\n  mark(): void {\n    if (this.head >= 0) {\n      throw new Error(\"F_CSSTOK_BAD_CALL mark\");\n    }\n    this.head = this.curr;\n  }\n\n  reset(): void {\n    if (this.head < 0) {\n      throw new Error(\"F_CSSTOK_BAD_CALL reset\");\n    }\n    this.curr = this.head;\n    this.head = -1;\n  }\n\n  unmark(): void {\n    this.head = -1;\n  }\n\n  hasMark(): boolean {\n    return this.head >= 0;\n  }\n\n  private reallocate(): void {\n    const newIndexMask = 2 * (this.indexMask + 1) - 1;\n    const newBuffer: Token[] = Array(newIndexMask + 1);\n    let oldIndex = this.head;\n    let newIndex = 0;\n    while (oldIndex != this.tail) {\n      newBuffer[newIndex] = this.buffer[oldIndex];\n      if (oldIndex == this.curr) {\n        this.curr = newIndex;\n      }\n      oldIndex = (oldIndex + 1) & this.indexMask;\n      newIndex++;\n    }\n    this.head = 0;\n    this.tail = newIndex;\n    this.indexMask = newIndexMask;\n    this.buffer = newBuffer;\n    while (newIndex <= newIndexMask) {\n      newBuffer[newIndex++] = new Token();\n    }\n  }\n\n  private error(position, token, mnemonics) {\n    if (this.handler) {\n      this.handler.error(mnemonics, token);\n    }\n  }\n\n  private fillBuffer(): void {\n    let tail = this.tail;\n    let head = this.head >= 0 ? this.head : this.curr;\n    let indexMask = this.indexMask;\n    if (tail >= head) {\n      head += indexMask;\n    } else {\n      head--;\n    }\n    if (head == tail) {\n      // only expect to get here when mark is in effect\n      if (this.head < 0) {\n        throw new Error(\"F_CSSTOK_INTERNAL\");\n      }\n      this.reallocate();\n      tail = this.tail;\n      indexMask = this.indexMask;\n      head = indexMask; // this.head is zero\n    }\n    let actions = actionsNormal;\n    const input = this.input;\n    let position = this.position;\n    const buffer = this.buffer;\n    let tokenType: TokenType = TokenType.EOF;\n    let tokenPosition: number = 0;\n    let tokenText: string = \"\";\n    let tokenNum: number = 0;\n    let seenSpace = false;\n    let token: Token = buffer[tail];\n    let backslashPos = -9; // far enough before the start of the string\n    while (true) {\n      const charCode = input.charCodeAt(position);\n      switch (actions[charCode] || actions[65] /*A*/) {\n        case Action.INVALID:\n          tokenType = TokenType.INVALID;\n          if (isNaN(charCode)) {\n            tokenText = \"E_CSS_UNEXPECTED_EOF\";\n          } else {\n            tokenText = \"E_CSS_UNEXPECTED_CHAR\";\n          }\n          actions = actionsNormal;\n          position++;\n          break;\n        case Action.SPACE:\n          position++;\n          seenSpace = true;\n          continue;\n        case Action.INT:\n          tokenPosition = position++;\n          actions = actionsInt;\n          continue;\n        case Action.IDENT:\n          tokenType = TokenType.IDENT;\n          tokenPosition = position++;\n          actions = actionsIdent;\n          continue;\n        case Action.BANG:\n          tokenPosition = position++;\n          tokenType = TokenType.BANG;\n          actions = actionsCheckEq;\n          continue;\n        case Action.STR1:\n          tokenType = TokenType.STR;\n          tokenPosition = ++position; // after quote\n          actions = actionsStr1;\n          continue;\n        case Action.STR2:\n          tokenType = TokenType.STR;\n          tokenPosition = ++position; // after quote\n          actions = actionsStr2;\n          continue;\n        case Action.HASH:\n          tokenPosition = ++position; // after hash\n          tokenType = TokenType.HASH;\n          actions = actionsIdent;\n          continue;\n        case Action.DOLLAR:\n          tokenPosition = position++;\n          tokenType = TokenType.DOLLAR;\n          actions = actionsCheckEq;\n          continue;\n        case Action.PERCENT:\n          tokenPosition = position++;\n          tokenType = TokenType.PERCENT;\n          break;\n        case Action.AMP:\n          tokenPosition = position++;\n          tokenType = TokenType.DOLLAR;\n          actions = actionsAmp;\n          continue;\n        case Action.O_PAR:\n          tokenPosition = position++;\n          tokenType = TokenType.O_PAR;\n          break;\n        case Action.C_PAR:\n          tokenPosition = position++;\n          tokenType = TokenType.C_PAR;\n          break;\n        case Action.STAR:\n          tokenPosition = position++;\n          tokenType = TokenType.STAR;\n          actions = actionsCheckEq;\n          continue;\n        case Action.PLUS:\n          tokenPosition = position++;\n          tokenType = TokenType.PLUS;\n          break;\n        case Action.COMMA:\n          tokenPosition = position++;\n          tokenType = TokenType.COMMA;\n          break;\n        case Action.MINUS:\n          tokenType = TokenType.MINUS;\n          tokenPosition = position++;\n          actions = actionsMinus;\n          continue;\n        case Action.DOT:\n          tokenPosition = position++;\n          actions = actionsNumOrClass;\n          continue;\n        case Action.TOCLASS:\n          tokenPosition = position++;\n          tokenType = TokenType.CLASS;\n          actions = actionsIdent;\n          continue;\n        case Action.SLASH:\n          tokenPosition = position++;\n          tokenType = TokenType.SLASH;\n          actions = actionsSlash;\n          continue;\n        case Action.COLON:\n          tokenPosition = position++;\n          tokenType = TokenType.COLON;\n          actions = actionsColon;\n          continue;\n        case Action.COL_COL:\n          position++;\n          tokenType = TokenType.COL_COL;\n          break;\n        case Action.SEMICOL:\n          tokenPosition = position++;\n          tokenType = TokenType.SEMICOL;\n          break;\n        case Action.LT:\n          tokenPosition = position++;\n          tokenType = TokenType.LT;\n          actions = actionsLt;\n          continue;\n        case Action.EQ:\n          tokenPosition = position++;\n          tokenType = TokenType.EQ;\n          actions = actionsCheckEq;\n          continue;\n        case Action.GT:\n          tokenPosition = position++;\n          tokenType = TokenType.GT;\n          actions = actionsCheckEq;\n          continue;\n        case Action.QMARK:\n          tokenPosition = position++;\n          tokenType = TokenType.QMARK;\n          break;\n        case Action.AT:\n          tokenPosition = ++position; // after \"at\" sign\n          tokenType = TokenType.AT;\n          actions = actionsIdent;\n          continue;\n        case Action.O_BRK:\n          tokenPosition = position++;\n          tokenType = TokenType.O_BRK;\n          break;\n        case Action.C_BRK:\n          tokenPosition = position++;\n          tokenType = TokenType.C_BRK;\n          break;\n        case Action.O_BRC:\n          tokenPosition = position++;\n          tokenType = TokenType.O_BRC;\n          break;\n        case Action.C_BRC:\n          tokenPosition = position++;\n          tokenType = TokenType.C_BRC;\n          break;\n        case Action.BSLASH:\n          tokenPosition = position++;\n          backslashPos = tokenPosition;\n          tokenType = TokenType.IDENT;\n          actions = actionsIdentEscChr;\n          continue;\n        case Action.HAT:\n          tokenPosition = position++;\n          tokenType = TokenType.HAT;\n          actions = actionsCheckEq;\n          continue;\n        case Action.BAR:\n          tokenPosition = position++;\n          tokenType = TokenType.BAR;\n          actions = actionsBar;\n          continue;\n        case Action.TILDE:\n          tokenPosition = position++;\n          tokenType = TokenType.TILDE;\n          actions = actionsCheckEq;\n          continue;\n        case Action.END:\n          // don't consume current char\n          break;\n        case Action.EQTAIL:\n          position++;\n          tokenType = (tokenType +\n            TokenType.BANG_EQ -\n            TokenType.BANG) as TokenType;\n          break;\n        case Action.ENDINT:\n          // don't consume current char\n          tokenType = TokenType.INT;\n          tokenNum = parseInt(input.substring(tokenPosition, position), 10);\n          break;\n        case Action.ENDNUM:\n          // don't consume current char\n          tokenType = TokenType.NUM;\n          tokenNum = parseFloat(input.substring(tokenPosition, position));\n          break;\n        case Action.CONT:\n          // just consume current char\n          position++;\n          continue;\n        case Action.UNIT:\n          tokenType = TokenType.NUMERIC;\n          tokenNum = parseFloat(input.substring(tokenPosition, position));\n          tokenPosition = position++;\n          actions = actionsIdent;\n          continue;\n        case Action.PCUNIT:\n          tokenType = TokenType.NUMERIC;\n          tokenNum = parseFloat(input.substring(tokenPosition, position));\n          tokenText = \"%\";\n          tokenPosition = position++; // for consistency with alphabetic units\n          break;\n        case Action.NUMBER:\n          position++;\n          actions = actionsNumber;\n          continue;\n        case Action.ENDIDNT:\n          // don't consume current char\n          // tokenType should be set already\n          tokenText = input.substring(tokenPosition, position);\n          break;\n        case Action.IDNTESC:\n          backslashPos = position++;\n          actions = actionsIdentEscChr;\n          continue;\n        case Action.ENDIDES:\n          // end of identifier with escapes\n          // don't consume current char\n          // tokenType should be set already\n          tokenText = escapeParse(input.substring(tokenPosition, position));\n          break;\n        case Action.ENDSTR:\n          tokenText = input.substring(tokenPosition, position); // consume closing quote\n          position++;\n          break;\n        case Action.ENDESTR:\n          tokenText = escapeParse(input.substring(tokenPosition, position)); // consume closing quote\n          position++;\n          break;\n        case Action.STR1ESC:\n          backslashPos = position;\n          position += 2; // consume character after backslash in any case\n          actions = actionsStr1Esc;\n          continue;\n        case Action.STR2ESC:\n          backslashPos = position;\n          position += 2; // consume character after backslash in any case\n          actions = actionsStr2Esc;\n          continue;\n        case Action.BAR_BAR:\n          position++;\n          tokenType = TokenType.BAR_BAR;\n          break;\n        case Action.AMP_AMP:\n          position++;\n          tokenType = TokenType.AMP_AMP;\n          break;\n        case Action.FUNC:\n          // tokenType can be TokenType.IDENT,\n          // TokenType.CLASS, TokenType.AT,\n          // TokenType.HASH, TokenType.NUMERIC\n          tokenText = input.substring(tokenPosition, position);\n          if (tokenType == TokenType.IDENT) {\n            position++; // consume\n            if (tokenText.toLowerCase() == \"url\") {\n              actions = actionsURL;\n              continue;\n            }\n            tokenType = TokenType.FUNC;\n          }\n          break;\n        case Action.FUNCES:\n          // tokenType can be TokenType.IDENT,\n          // TokenType.CLASS, TokenType.AT,\n          // TokenType.HASH, T_NUMERIC\n          tokenText = escapeParse(input.substring(tokenPosition, position));\n          if (tokenType == TokenType.IDENT) {\n            position++; // consume\n            if (tokenText.toLowerCase() == \"url\") {\n              actions = actionsURL;\n              continue;\n            }\n            tokenType = TokenType.FUNC;\n          }\n          break;\n        case Action.COMMENT:\n          actions = actionsComment;\n          position++;\n          continue;\n        case Action.COMMST:\n          actions = actionsCommentStar;\n          position++;\n          continue;\n        case Action.ENDNOTK:\n          actions = actionsNormal;\n          position++;\n          continue;\n        case Action.MINMIN:\n          actions = actionsMinusMinus;\n          position++;\n          continue;\n        case Action.TOINT:\n          tokenType = TokenType.INT;\n          actions = actionsInt;\n          position++;\n          continue;\n        case Action.TONUM:\n          tokenType = TokenType.NUM;\n          actions = actionsNumber;\n          position++;\n          continue;\n        case Action.TOIDENT:\n          tokenType = TokenType.IDENT;\n          actions = actionsIdent;\n          position++;\n          continue;\n        case Action.TOIDES:\n          tokenType = TokenType.IDENT;\n          actions = actionsIdentEscChr;\n          backslashPos = position++;\n          continue;\n        case Action.KILL1:\n          position--;\n          break;\n        case Action.KILL2:\n          position -= 2;\n          break;\n        case Action.URL:\n          tokenPosition = position++;\n          actions = actionsURLInside;\n          continue;\n        case Action.URL1:\n          tokenPosition = ++position; // skip quote\n          actions = actionsURLInside1;\n          continue;\n        case Action.URL2:\n          tokenPosition = ++position; // skip quote\n          actions = actionsURLInside2;\n          continue;\n        case Action.ENDURL:\n          tokenType = TokenType.URL;\n          tokenText = escapeParse(input.substring(tokenPosition, position));\n          position++; // skip ')'\n          break;\n        case Action.FINURL:\n          position++; // skip ')'\n          break;\n        case Action.LT_BG:\n          actions = actionsLtBang;\n          position++;\n          continue;\n        case Action.LT_BG_M:\n          actions = actionsLtBangMinus;\n          position++;\n          continue;\n        case Action.CHKSP:\n          // newline in non-quoted URL - check if end of url\n          if (position - backslashPos < 8) {\n            // close enough: may be valid\n            if (\n              input\n                .substring(backslashPos + 1, position + 1)\n                .match(/^[0-9a-fA-F]{0,6}(\\r\\n|[\\n\\r])|[ \\t]$/)\n            ) {\n              // valid, keep going\n              position++;\n              continue;\n            }\n          }\n\n        // end of url\n        // fall through\n        case Action.TERMURL:\n          tokenType = TokenType.URL;\n          tokenText = escapeParse(input.substring(tokenPosition, position));\n          position++; // skip quote (or newline)\n          actions = actionsURLTail;\n          continue;\n        case Action.CHKPOSN:\n          // newline in string or quoted URL - check validity\n          position++;\n          if (position - backslashPos < 9) {\n            // close enough: may be valid\n            if (\n              input\n                .substring(backslashPos + 1, position)\n                .match(/^[0-9a-fA-F]{0,6}(\\r\\n|[\\n\\r])$/)\n            ) {\n              // valid, keep going\n              continue;\n            }\n          }\n\n          // invalid token\n          tokenType = TokenType.INVALID;\n          tokenText = \"E_CSS_UNEXPECTED_NEWLINE\";\n          actions = actionsNormal;\n          break;\n        case Action.CHKPOSS:\n          // space in identifier - check validity\n          if (position - backslashPos < 9) {\n            // close enough: may be valid\n            if (\n              input\n                .substring(backslashPos + 1, position + 1)\n                .match(/^[0-9a-fA-F]{0,6}[ \\t]$/)\n            ) {\n              // valid, keep going\n              position++;\n              continue;\n            }\n          }\n\n          // end of identifier\n          // don't consume current char\n          // tokenType should be set already\n          tokenText = escapeParse(input.substring(tokenPosition, position));\n          break;\n        case Action.URLESC:\n          backslashPos = position++;\n          continue;\n        case Action.IDESCH:\n          position++;\n          actions = actionsIdentEsc;\n          continue;\n        default:\n          // EOF\n          if (actions !== actionsNormal) {\n            tokenType = TokenType.INVALID;\n            tokenText = \"E_CSS_UNEXPECTED_STATE\";\n            break;\n          }\n          tokenPosition = position;\n          tokenType = TokenType.EOF;\n      }\n      token.type = tokenType;\n      token.precededBySpace = seenSpace;\n      token.num = tokenNum;\n      token.text = tokenText;\n      token.position = tokenPosition;\n      tail++;\n      if (tail >= head) {\n        break;\n      }\n      actions = actionsNormal;\n      seenSpace = false;\n      token = buffer[tail & indexMask];\n    }\n    this.position = position;\n    this.tail = tail & indexMask;\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Task - Support for asynchronous execution and cooperative\n * multitasking.\n */\nimport * as Base from \"./base\";\nimport * as Logging from \"./logging\";\n\n/**\n * External timer. Only needed for testing.\n */\nexport interface Timer {\n  /**\n   * @return current time in milliseconds.\n   */\n  currentTime(): number;\n\n  /**\n   * Calls function after a given timeout.\n   * @param fn function to call.\n   * @param delay timeout in milliseconds.\n   * @return unique number that can be used to clear the timeout.\n   */\n  setTimeout(fn: () => void, delay: number): number;\n\n  /**\n   * Calls function after a given timeout.\n   * @param token timeout token.\n   * @return.\n   */\n  clearTimeout(token: number): void;\n}\n\n/**\n * Result of an asynchronous function that may be available immediately or\n * some time later. Similar to Deferred.\n * @template T\n */\nexport interface Result<T> {\n  /**\n   * Call the given function when asynchronous function is finished. Callback\n   * is executed in the task's context.\n   */\n  then(callback: (p1: T) => void): void;\n\n  /**\n   * Call the given asynchronous function when some asynchronous function is\n   * finished. Callback is executed in the task's context.\n   * @template T1\n   */\n  thenAsync<T1>(callback: (p1: T) => Result<T1>): Result<T1>;\n\n  /**\n   * Produce a Result that resolves to the given value when this Result is\n   * resolved.\n   * @template T1\n   */\n  thenReturn<T1>(result: T1): Result<T1>;\n\n  /**\n   * Finish given frame with the result value when result becomes ready.\n   */\n  thenFinish(frame: Frame<T>): void;\n\n  /**\n   * Check if this Result is still pending.\n   */\n  isPending(): boolean;\n\n  /**\n   * If this Result is resolved, return the value that it holds.\n   */\n  get(): T | null;\n}\n\nexport let privateCurrentTask: Task | null = null;\n\nexport let primaryScheduler: Scheduler | null = null;\n\n/**\n * Returns current task.\n */\nexport function currentTask(): Task | null {\n  return privateCurrentTask;\n}\n\n/**\n * Create and return a new frame with the given name.\n */\nexport function newFrame<T>(name: string): Frame<T> {\n  if (!privateCurrentTask) {\n    throw new Error(\"E_TASK_NO_CONTEXT\");\n  }\n  if (!privateCurrentTask.name) {\n    privateCurrentTask.name = name;\n  }\n  const task = privateCurrentTask;\n  const frame = new Frame<T>(task, task.top, name);\n  task.top = frame;\n  frame.state = FrameState.ACTIVE;\n  return frame;\n}\n\nexport function newEventSource(): EventSource {\n  return new EventSource();\n}\n\nexport function newScheduler(opt_timer?: Timer): Scheduler {\n  return new Scheduler(opt_timer || new TimerImpl());\n}\n\n/**\n * @template T\n */\nexport function newResult<T>(opt_value: T): Result<T> {\n  return new SyncResultImpl<T>(opt_value);\n}\n\n/**\n * Creates a new frame and runs code in its context, catching synchronous and\n * asynchronous errors. If an error occurs, onErr is run (in the context of\n * the same frame). As usual, onErr is supposed either produce a result or raise\n * an exception.\n */\nexport function handle<T>(\n  name: any,\n  code: (p1: Frame<T>) => void,\n  onErr: (p1: Frame<T>, p2: Error) => void,\n): Result<T> {\n  const frame = newFrame<T>(name);\n  frame.handler = onErr;\n  try {\n    code(frame);\n  } catch (err) {\n    // synchronous exception\n    frame.task.raise(err, frame);\n  }\n  return frame.result();\n}\n\nexport function start<T>(func: () => Result<T>, opt_name?: string): Task {\n  const scheduler = privateCurrentTask\n    ? privateCurrentTask.getScheduler()\n    : primaryScheduler || newScheduler();\n  return scheduler.run(func, opt_name);\n}\n\n/**\n * Frame state.\n * @enum {number}\n */\nexport enum FrameState {\n  INIT, // before newFrame call\n  ACTIVE, // before finish call\n  FINISHED, // before callback complete\n  DEAD, // when callback is complete\n}\nexport class TimerImpl implements Timer {\n  /**\n   * @override\n   */\n  currentTime(): number {\n    return new Date().valueOf();\n  }\n\n  /**\n   * @override\n   */\n  setTimeout(fn: () => void, delay: number) {\n    // HACK: casting to unknown type to prevent TypeScript error\n    // [TS2352] Conversion of type 'Timer' to type 'number' may be a mistake because neither type sufficiently overlaps with the other.\n    const timer: unknown = setTimeout(fn, delay);\n    return timer as number;\n  }\n\n  /**\n   * @override\n   */\n  clearTimeout(token: number): void {\n    clearTimeout(token);\n  }\n}\n\n/**\n * A class to create tasks.\n */\nexport class Scheduler {\n  timeout: number = 1;\n  slice: number = 25;\n  sliceOverTime: number = 0;\n  queue: Base.PriorityQueue;\n  wakeupTime: number | null = null;\n  timeoutToken: number | null = null;\n  inTimeSlice: boolean = false;\n  order: number = 0;\n\n  constructor(public timer: Timer) {\n    this.queue = new Base.PriorityQueue();\n    if (!primaryScheduler) {\n      primaryScheduler = this;\n    }\n  }\n\n  /**\n   * Sets time slice length.\n   * @param slice length in milliseconds.\n   */\n  setSlice(slice: number) {\n    this.slice = slice;\n  }\n\n  /**\n   * Sets timeout between time slices.\n   * @param timeout in milliseconds.\n   */\n  setTimeout(timeout: number) {\n    this.timeout = timeout;\n  }\n\n  /**\n   * Checks if the current time slice is over.\n   */\n  isTimeSliceOver(): boolean {\n    const now = this.timer.currentTime();\n    return now >= this.sliceOverTime;\n  }\n\n  private arm(): void {\n    if (this.inTimeSlice) {\n      return;\n    }\n    const nextInQueue = this.queue.peek() as Continuation<any>;\n    const newTime = nextInQueue.scheduledTime;\n    const now = this.timer.currentTime();\n    if (this.timeoutToken != null) {\n      if (now + this.timeout > this.wakeupTime) {\n        return; // no use re-arming\n      }\n      this.timer.clearTimeout(this.timeoutToken);\n    }\n    let timeout = newTime - now;\n    if (timeout <= this.timeout) {\n      timeout = this.timeout;\n    }\n    this.wakeupTime = now + timeout;\n    const self = this;\n    this.timeoutToken = this.timer.setTimeout(() => {\n      self.timeoutToken = null;\n      self.doTimeSlice();\n    }, timeout);\n  }\n\n  schedule(continuation: Continuation<any>, opt_delay?: number): void {\n    const c = continuation as Continuation<any>;\n    const now = this.timer.currentTime();\n    c.order = this.order++;\n    c.scheduledTime = now + (opt_delay || 0);\n    this.queue.add(c);\n    this.arm();\n  }\n\n  private doTimeSlice(): void {\n    if (this.timeoutToken != null) {\n      this.timer.clearTimeout(this.timeoutToken);\n      this.timeoutToken = null;\n    }\n    this.inTimeSlice = true;\n    try {\n      let now = this.timer.currentTime();\n      this.sliceOverTime = now + this.slice;\n      while (this.queue.length()) {\n        const continuation = this.queue.peek() as Continuation<any>;\n        if (continuation.scheduledTime > now) {\n          break; // too early\n        }\n        this.queue.remove();\n        if (!continuation.canceled) {\n          continuation.resumeInternal();\n        }\n        now = this.timer.currentTime();\n        if (now >= this.sliceOverTime) {\n          break;\n        }\n      }\n    } catch (err) {\n      Logging.logger.error(err);\n    }\n    this.inTimeSlice = false;\n    if (this.queue.length()) {\n      this.arm();\n    }\n  }\n\n  run(func: () => Result<any>, opt_name?: string): Task {\n    const task = new Task(this, opt_name || \"\");\n    task.top = new Frame<any>(task, null, \"bootstrap\");\n    task.top.state = FrameState.ACTIVE;\n    task.top.then(() => {\n      const done = () => {\n        task.running = false;\n        for (const callback of task.callbacks) {\n          try {\n            callback();\n          } catch (err) {\n            Logging.logger.error(err);\n          }\n        }\n      };\n      try {\n        func().then((result) => {\n          task.result = result;\n          done();\n        });\n      } catch (err) {\n        task.raise(err);\n        done();\n      }\n    });\n    const savedTask = privateCurrentTask;\n    privateCurrentTask = task;\n    this.schedule(task.top.suspend(\"bootstrap\"));\n    privateCurrentTask = savedTask;\n    return task;\n  }\n}\n\n/**\n * Task suspension point.\n * @template T\n */\nexport class Continuation<T> implements Base.Comparable {\n  scheduledTime: number = 0;\n  order: number = 0;\n  result: T = null;\n  canceled: boolean = false;\n\n  constructor(public task: Task) {}\n\n  /**\n   * @override\n   */\n  compare(otherComp: Base.Comparable): number {\n    // earlier wins\n    const other = otherComp as Continuation<any>;\n    return other.scheduledTime - this.scheduledTime || other.order - this.order;\n  }\n\n  /**\n   * Continuation's task\n   */\n  getTask(): Task {\n    return this.task;\n  }\n\n  /**\n   * Schedule task continuation after the given (optional) delay.\n   * @param opt_delay optional delay in milliseconds.\n   */\n  schedule(result: T, opt_delay?: number) {\n    this.result = result;\n    this.task.scheduler.schedule(this, opt_delay);\n  }\n\n  resumeInternal(): boolean {\n    const task = this.task;\n    this.task = null;\n    if (task && task.continuation == this) {\n      task.continuation = null;\n      const savedTask = privateCurrentTask;\n      privateCurrentTask = task;\n      task.top.finish(this.result);\n      privateCurrentTask = savedTask;\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * Cancel continuation\n   */\n  cancel() {\n    this.canceled = true;\n  }\n}\n\n/**\n * An asynchronous, time-sliced task.\n */\nexport class Task {\n  callbacks: (() => void)[] = [];\n  exception: Error | null = null;\n  running: boolean = true;\n  result: any = null;\n  waitTarget: string | null = null;\n  top: Frame<any> | null = null;\n  continuation: Continuation<any> | null = null;\n\n  constructor(public scheduler: Scheduler, public name: string) {}\n\n  /**\n   * @return task name.\n   */\n  getName(): string {\n    return this.name;\n  }\n\n  /**\n   * @param err exception to throw in the task's context.\n   */\n  interrupt(err: Error): void {\n    this.raise(err || new Error(\"E_TASK_INTERRUPT\"));\n    if (this !== privateCurrentTask && this.continuation) {\n      // blocked on something\n      this.continuation.cancel();\n      const continuation = new Continuation(this);\n      this.waitTarget = \"interrupt\";\n      this.continuation = continuation;\n      this.scheduler.schedule(continuation);\n    }\n  }\n\n  /**\n   * @return this task's scheduler.\n   */\n  getScheduler(): Scheduler {\n    return this.scheduler;\n  }\n\n  /**\n   * @return true if task is still running.\n   */\n  isRunning(): boolean {\n    return this.running;\n  }\n\n  /**\n   * Register a callback to be called when the task is done. Callback is not\n   * executed in any task context. Multiple callbacks can be registered and\n   * they will be called in the registration order.\n   */\n  whenDone(callback: () => void): void {\n    this.callbacks.push(callback);\n  }\n\n  /**\n   * Wait for task to finish (from another task).\n   */\n  join(): Result<any> {\n    const frame = newFrame<any>(\"Task.join\");\n    if (!this.running) {\n      frame.finish(this.result);\n    } else {\n      const continuation = frame.suspend(this);\n      const self = this;\n      this.whenDone(() => {\n        continuation.schedule(self.result);\n      });\n    }\n    return frame.result();\n  }\n\n  /**\n   * Unwind the stack. We have two stacks: async (maintained by frame\n   * parent link) and sync (regular JavaScript stack).\n   */\n  unwind() {\n    // We have a sequence of frames on the stack.\n    while (this.top && !this.top.handler) {\n      this.top = this.top.parent;\n    }\n    if (this.top && this.top.handler && this.exception) {\n      // found a handler\n      const err = this.exception;\n      this.exception = null;\n      this.top.handler(this.top, err);\n    } else {\n      if (this.exception) {\n        Logging.logger.error(\n          this.exception,\n          \"Unhandled exception in task\",\n          this.name,\n        );\n      }\n    }\n  }\n\n  raise(err: Error, opt_frame?: Frame<any>): void {\n    this.fillStack(err);\n    if (opt_frame) {\n      let f = this.top;\n      while (f && f != opt_frame) {\n        f = f.parent;\n      }\n      if (f == opt_frame) {\n        this.top = f;\n      }\n    }\n    this.exception = err;\n    this.unwind();\n  }\n\n  /**\n   * Fill the stack trace in the exception\n   * @param err exception\n   */\n  fillStack(err: Error) {\n    let out = err[\"frameTrace\"];\n    if (!out) {\n      out = err[\"stack\"] ? `${err[\"stack\"]}\\n\\t---- async ---\\n` : \"\";\n      for (let f = this.top; f; f = f.parent) {\n        out += \"\\t\";\n        out += f.getName();\n        out += \"\\n\";\n      }\n      err[\"frameTrace\"] = out;\n    }\n  }\n}\n\n/**\n * @template T\n */\nexport class SyncResultImpl<T> implements Result<T> {\n  constructor(public value: T) {}\n\n  /**\n   * @override\n   */\n  then(callback: (T: any) => void) {\n    callback(this.value);\n  }\n\n  /**\n   * @override\n   */\n  thenAsync<T1>(callback: (p1: T) => Result<T1>) {\n    return callback(this.value);\n  }\n\n  /**\n   * @override\n   */\n  thenReturn<T1>(result: T1) {\n    return new SyncResultImpl(result);\n  }\n\n  /**\n   * @override\n   */\n  thenFinish(frame: Frame<T>): void {\n    frame.finish(this.value);\n  }\n\n  /**\n   * @override\n   */\n  isPending(): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  get(): T | null {\n    return this.value;\n  }\n}\n\n/**\n * @template T\n */\nexport class ResultImpl<T> implements Result<T> {\n  constructor(public readonly frame: Frame<T>) {}\n\n  /**\n   * @override\n   */\n  then(callback: (p1: T) => void): void {\n    this.frame.then(callback);\n  }\n\n  /**\n   * @override\n   */\n  thenAsync<T1>(callback: (p1: T) => Result<T1>): Result<T1> {\n    if (this.isPending()) {\n      // thenAsync is special, do the trick with the context\n      const frame = new Frame<T | T1>(\n        this.frame.task,\n        this.frame.parent,\n        \"AsyncResult.thenAsync\",\n      );\n      frame.state = FrameState.ACTIVE;\n      this.frame.parent = frame as Frame<T>;\n      this.frame.then((res1) => {\n        callback(res1).then((res2) => {\n          frame.finish(res2);\n        });\n      });\n      return frame.result() as Result<T1>;\n    } else {\n      return callback(this.frame.res);\n    }\n  }\n\n  /**\n   * @override\n   */\n  thenReturn<T1>(result: T1) {\n    if (this.isPending()) {\n      return this.thenAsync(() => new SyncResultImpl(result));\n    } else {\n      return new SyncResultImpl(result);\n    }\n  }\n\n  /**\n   * @override\n   */\n  thenFinish(frame: Frame<T>): void {\n    if (this.isPending()) {\n      this.then((res) => {\n        frame.finish(res);\n      });\n    } else {\n      frame.finish(this.frame.res);\n    }\n  }\n\n  /**\n   * @override\n   */\n  isPending(): boolean {\n    return this.frame.state == FrameState.ACTIVE;\n  }\n\n  /**\n   * @override\n   */\n  get(): T | null {\n    if (this.isPending()) {\n      throw new Error(\"Result is pending\");\n    }\n    return this.frame.res;\n  }\n}\n\n/**\n * Asynchronous execution frame. Corresponds to an asynchronous function\n * invocation.\n * @template T\n */\nexport class Frame<T> {\n  res: T = null;\n  state: FrameState;\n  callback: ((p1: any) => void) | null = null;\n  handler: ((p1: Frame<any>, p2: Error) => void) | null = null;\n\n  constructor(public task: Task, public parent: Frame<T>, public name: string) {\n    this.state = FrameState.INIT;\n  }\n\n  private checkEnvironment(): void {\n    if (!privateCurrentTask) {\n      throw new Error(\"F_TASK_NO_CONTEXT\");\n    }\n    if (this !== privateCurrentTask.top) {\n      throw new Error(\"F_TASK_NOT_TOP_FRAME\");\n    }\n  }\n\n  /**\n   * @return to be returned as this asynchronous function return value.\n   */\n  result(): Result<T> {\n    return new ResultImpl<T>(this);\n  }\n\n  finish(res: T) {\n    this.checkEnvironment();\n    if (privateCurrentTask && !privateCurrentTask.exception) {\n      this.res = res;\n    }\n    this.state = FrameState.FINISHED;\n    const frame = this.parent;\n    if (privateCurrentTask) {\n      privateCurrentTask.top = frame;\n    }\n    if (this.callback) {\n      try {\n        this.callback(res);\n      } catch (err) {\n        this.task.raise(err, frame);\n      }\n\n      // callback was called\n      this.state = FrameState.DEAD;\n    }\n  }\n\n  getTask(): Task {\n    return this.task;\n  }\n\n  /**\n   * @return frame name.\n   */\n  getName(): string {\n    return this.name;\n  }\n\n  getScheduler(): Scheduler {\n    return this.task.scheduler;\n  }\n\n  then(callback: (p1: T) => void): void {\n    // legal to call when currentTask is null\n    switch (this.state) {\n      case FrameState.ACTIVE:\n        if (this.callback) {\n          throw new Error(\"F_TASK_FRAME_ALREADY_HAS_CALLBACK\");\n        } else {\n          this.callback = callback;\n        }\n        break;\n      case FrameState.FINISHED: {\n        const task = this.task;\n        const frame = this.parent;\n        try {\n          callback(this.res);\n          this.state = FrameState.DEAD;\n        } catch (err) {\n          this.state = FrameState.DEAD;\n          task.raise(err, frame);\n        }\n        break;\n      }\n      case FrameState.DEAD:\n        throw new Error(\"F_TASK_DEAD_FRAME\");\n      default:\n        throw new Error(`F_TASK_UNEXPECTED_FRAME_STATE ${this.state}`);\n    }\n  }\n\n  /**\n   * If this task was executed longer than task's slice parameter.\n   * @return holds true\n   */\n  timeSlice(): Result<boolean> {\n    const frame = newFrame<boolean>(\"Frame.timeSlice\");\n    const scheduler = frame.getScheduler();\n    if (scheduler.isTimeSliceOver()) {\n      Logging.logger.debug(\"-- time slice --\");\n      frame.suspend().schedule(true);\n    } else {\n      frame.finish(true);\n    }\n    return frame.result();\n  }\n\n  /**\n   * Yield to other tasks for the specified time.\n   * @param delay in milliseconds.\n   * @return holds true\n   */\n  sleep(delay: number): Result<boolean> {\n    const frame = newFrame<boolean>(\"Frame.sleep\");\n    frame.suspend().schedule(true, delay);\n    return frame.result();\n  }\n\n  /**\n   * Repeatedly execute the given function asynchronously until it returns\n   * false.\n   * @return holds true.\n   */\n  loop(func: () => Result<boolean>): Result<boolean> {\n    const frame = newFrame<boolean>(\"Frame.loop\");\n    const step = (more) => {\n      try {\n        while (more) {\n          const result = func();\n          if (result.isPending()) {\n            result.then(step);\n            return;\n          } else {\n            result.then((m) => {\n              more = m;\n            });\n          }\n        }\n        frame.finish(true);\n      } catch (err) {\n        frame.task.raise(err, frame);\n      }\n    };\n    step(true);\n    return frame.result();\n  }\n\n  /**\n   * Similar to loop(), but provides a Frame for loop body function.\n   * @return holds true.\n   */\n  loopWithFrame(func: (p1: LoopBodyFrame) => void): Result<boolean> {\n    const task = privateCurrentTask;\n    if (!task) {\n      throw new Error(\"E_TASK_NO_CONTEXT\");\n    }\n    return this.loop(() => {\n      let result: Result<boolean>;\n      do {\n        const frame = new LoopBodyFrame(task as Task, task.top);\n        task.top = frame;\n        frame.state = FrameState.ACTIVE;\n        func(frame);\n        result = frame.result();\n      } while (!result.isPending() && result.get());\n      return result;\n    });\n  }\n\n  suspend(opt_waitTarget?: any): Continuation<T> {\n    this.checkEnvironment();\n    if (this.task.continuation) {\n      throw new Error(\"E_TASK_ALREADY_SUSPENDED\");\n    }\n    const continuation: Continuation<T> = new Continuation(this.task);\n    this.task.continuation = continuation;\n    privateCurrentTask = null;\n    this.task.waitTarget = opt_waitTarget || null;\n    return continuation;\n  }\n}\n\nexport class LoopBodyFrame extends Frame<boolean> {\n  constructor(task: Task, parent: Frame<boolean>) {\n    super(task, parent, \"loop\");\n  }\n\n  continueLoop(): void {\n    this.finish(true);\n  }\n\n  breakLoop(): void {\n    this.finish(false);\n  }\n}\n\nexport class EventItem {\n  next: EventItem = null;\n\n  constructor(public event: Base.Event) {}\n}\n\n/**\n * An class to listen to evens and present them as a readable asynchronous\n * stream to tasks.\n */\nexport class EventSource {\n  continuation: Continuation<boolean> = null;\n  listeners: {\n    target: Base.EventTarget;\n    type: string;\n    listener: Base.EventListener;\n  }[] = [];\n  head: EventItem;\n  tail: EventItem;\n\n  constructor() {\n    this.head = new EventItem(null);\n    this.tail = this.head;\n  }\n\n  /**\n   * Attaches as an event listener to an EventTarget.\n   */\n  attach(\n    target: Base.EventTarget,\n    type: string,\n    opt_preventDefault?: boolean,\n  ): void {\n    const self = this;\n    const listener = (event) => {\n      if (opt_preventDefault) {\n        event.preventDefault();\n      }\n      if (self.tail.event) {\n        self.tail.next = new EventItem(event);\n        self.tail = self.tail.next;\n      } else {\n        self.tail.event = event;\n        const continuation = self.continuation;\n        if (continuation) {\n          self.continuation = null;\n          continuation.schedule(true);\n        }\n      }\n    };\n    target.addEventListener(type, listener, false);\n    this.listeners.push({ target, type, listener });\n  }\n\n  detach(target: Base.EventTarget, type: string): void {\n    let i = 0;\n    let item: {\n      target: Base.SimpleEventTarget;\n      type: string;\n      listener: Base.EventListener;\n    } = null;\n    while (i < this.listeners.length) {\n      item = this.listeners[i];\n      if (item.type == type && item.target === target) {\n        this.listeners.splice(i, 1);\n        item.target.removeEventListener(item.type, item.listener, false);\n        return;\n      }\n      i++;\n    }\n    throw new Error(\"E_TASK_EVENT_SOURCE_NOT_ATTACHED\");\n  }\n\n  /**\n   * Read next dispatched event, blocking the current task if needed.\n   */\n  nextEvent(): Result<Base.Event> {\n    const frame: Frame<Base.Event> = newFrame(\"EventSource.nextEvent\");\n    const self = this;\n    const readEvent = () => {\n      if (self.head.event) {\n        const event = self.head.event;\n        if (self.head.next) {\n          self.head = self.head.next;\n        } else {\n          self.head.event = null;\n        }\n        frame.finish(event);\n      } else if (self.continuation) {\n        throw new Error(\"E_TASK_EVENT_SOURCE_OTHER_TASK_WAITING\");\n      } else {\n        const frameInternal: Frame<boolean> = newFrame(\n          \"EventSource.nextEventInternal\",\n        );\n        self.continuation = frameInternal.suspend(self);\n        frameInternal.result().then(readEvent);\n      }\n    };\n    readEvent();\n    return frame.result();\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview TaskUtil - Utilities asynchronous execution and cooperative\n * multitasking.\n */\nimport * as Base from \"./base\";\nimport * as Logging from \"./logging\";\nimport * as Task from \"./task\";\n\n/**\n * A class that can fetch or compute a resource that may be needed by multiple\n * tasks. The first time a resource is requested, it is fetched and then given\n * to everyone requesting it.\n * @template T\n * @param fetch function that fetches/computes\n *    a resource; it will be run in a separate task.\n */\nexport class Fetcher<T> {\n  name: string;\n  arrived: boolean = false;\n  resource: T = null;\n  task: Task.Task = null;\n  piggybacks: ((p1: any) => void)[] | null = [];\n\n  constructor(public readonly fetch: () => Task.Result<T>, opt_name?: string) {\n    this.name = opt_name;\n  }\n\n  /**\n   * Start fetching/computing a resource, don't block current task.\n   */\n  start(): void {\n    if (!this.task) {\n      const self = this;\n      this.task = Task.currentTask()\n        .getScheduler()\n        .run(() => {\n          const frame = Task.newFrame(\"Fetcher.run\");\n          self.fetch().then((resource) => {\n            const piggibacks = self.piggybacks;\n            self.arrived = true;\n            self.resource = resource;\n            self.task = null;\n            self.piggybacks = [];\n            if (piggibacks) {\n              for (let i = 0; i < piggibacks.length; i++) {\n                try {\n                  piggibacks[i](resource);\n                } catch (err) {\n                  Logging.logger.error(err, \"Error:\");\n                }\n              }\n            }\n            frame.finish(resource);\n          });\n          return frame.result();\n        }, this.name);\n    }\n  }\n\n  piggyback(fn: (p1: T) => void): void {\n    if (this.arrived) {\n      fn(this.resource);\n    } else {\n      this.piggybacks.push(fn);\n    }\n  }\n\n  /**\n   * Fetches the resource, waits for it to arrive if it is already being\n   * fetched.\n   */\n  get(): Task.Result<T> {\n    if (this.arrived) {\n      return Task.newResult(this.resource);\n    }\n    this.start();\n    return this.task.join() as Task.Result<T>;\n  }\n\n  hasArrived(): boolean {\n    return this.arrived;\n  }\n}\n\n/**\n * Wait for all Fetcher objects in the array to arrive\n */\nexport const waitForFetchers = <T>(\n  fetchers: Fetcher<T>[],\n): Task.Result<boolean> => {\n  if (fetchers.length == 0) {\n    return Task.newResult(true);\n  }\n  if (fetchers.length == 1) {\n    return fetchers[0].get().thenReturn(true);\n  }\n  const frame = Task.newFrame<boolean>(\"waitForFetches\");\n  let i = 0;\n  frame\n    .loop(() => {\n      while (i < fetchers.length) {\n        const fetcher = fetchers[i++];\n        if (!fetcher.hasArrived()) {\n          return fetcher.get().thenReturn(true);\n        }\n      }\n      return Task.newResult(false);\n    })\n    .then(() => {\n      frame.finish(true);\n    });\n  return frame.result();\n};\n\n/**\n * @return holding event type (load/error/abort)\n */\nexport function loadElement(elem: Element, src: string): Fetcher<string> {\n  let width: string | null = null;\n  let height: string | null = null;\n  if (elem.localName == \"img\") {\n    width = elem.getAttribute(\"width\");\n    height = elem.getAttribute(\"height\");\n  }\n  const fetcher = new Fetcher(() => {\n    const frame: Task.Frame<string> = Task.newFrame(\"loadImage\");\n    const continuation = frame.suspend(elem);\n    let done = false;\n    const handler = (evt: Event) => {\n      if (done) {\n        return;\n      } else {\n        done = true;\n      }\n      if (elem.localName == \"img\") {\n        // IE puts these bogus attributes, even if they were not present\n        if (!width) {\n          elem.removeAttribute(\"width\");\n        }\n        if (!height) {\n          elem.removeAttribute(\"height\");\n        }\n      }\n      continuation.schedule(evt ? evt.type : \"timeout\");\n    };\n    elem.addEventListener(\"load\", handler, false);\n    elem.addEventListener(\"error\", handler, false);\n    elem.addEventListener(\"abort\", handler, false);\n    if (elem.namespaceURI == Base.NS.SVG) {\n      elem.setAttributeNS(Base.NS.XLINK, \"xlink:href\", src);\n\n      // SVG handlers are not reliable\n      setTimeout(handler, 300);\n    } else {\n      (elem as any).src = src;\n    }\n    return frame.result();\n  }, `loadElement ${src}`);\n  fetcher.start();\n  return fetcher;\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Net - Fetch resource from a URL.\n */\nimport * as Base from \"./base\";\nimport * as Logging from \"./logging\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\nimport { Net, XmlDoc } from \"./types\";\nimport UserAgentXml from \"./assets/user-agent.xml\";\n\n/**\n * @enum {string}\n */\nexport enum XMLHttpRequestResponseType {\n  DEFAULT = \"\",\n  ARRAYBUFFER = \"arraybuffer\",\n  BLOB = \"blob\",\n  DOCUMENT = \"document\",\n  JSON = \"json\",\n  TEXT = \"text\",\n}\n\nexport type Response = Net.Response;\n\nexport function ajax(\n  url: string,\n  opt_type?: XMLHttpRequestResponseType,\n  opt_method?: string,\n  opt_data?: string,\n  opt_contentType?: string,\n): Task.Result<Response> {\n  const frame: Task.Frame<Response> = Task.newFrame(\"ajax\");\n  const request = new XMLHttpRequest();\n  const continuation = frame.suspend(request);\n  const response: Response = {\n    status: 0,\n    statusText: \"\",\n    url,\n    contentType: null,\n    responseText: null,\n    responseXML: null,\n    responseBlob: null,\n  };\n  request.open(opt_method || \"GET\", url, true);\n  if (opt_type) {\n    request.responseType = opt_type;\n  }\n  request.onreadystatechange = () => {\n    if (request.readyState === 4) {\n      response.status = request.status;\n      response.statusText =\n        request.statusText || (request.status == 404 && \"Not Found\") || \"\";\n      if (response.status == 200 || response.status == 0) {\n        if (\n          (!opt_type || opt_type === XMLHttpRequestResponseType.DOCUMENT) &&\n          request.responseXML &&\n          request.responseXML.documentElement.localName != \"parsererror\"\n        ) {\n          response.responseXML = request.responseXML;\n          response.contentType = (request.responseXML as any).contentType;\n        } else if (\n          (!opt_type || opt_type === XMLHttpRequestResponseType.DOCUMENT) &&\n          request.response instanceof HTMLDocument\n        ) {\n          response.responseXML = request.response;\n          response.contentType = (request.response as any).contentType;\n        } else {\n          const text = request.response;\n          if (\n            (!opt_type || opt_type === XMLHttpRequestResponseType.TEXT) &&\n            typeof text == \"string\"\n          ) {\n            response.responseText = text;\n          } else if (!text) {\n            Logging.logger.warn(\"Unexpected empty success response for\", url);\n          } else {\n            if (typeof text == \"string\") {\n              response.responseBlob = makeBlob([text]);\n            } else {\n              response.responseBlob = text as Blob;\n            }\n          }\n          const contentTypeHeader = request.getResponseHeader(\"Content-Type\");\n          if (contentTypeHeader) {\n            response.contentType = contentTypeHeader.replace(/(.*);.*$/, \"$1\");\n          }\n        }\n      }\n      continuation.schedule(response);\n    }\n  };\n  try {\n    if (opt_data) {\n      request.setRequestHeader(\n        \"Content-Type\",\n        opt_contentType || \"text/plain; charset=UTF-8\",\n      );\n      request.send(opt_data);\n    } else {\n      if (/^file:|^https?:\\/\\/[^/]+\\.githubusercontent\\.com|\\.opf$/.test(url)) {\n        // File or GitHub raw URL or .opf\n        if (\n          /\\/aozorabunko\\/[^/]+\\/cards\\/[^/]+\\/files\\/[^/.]+\\.html$/.test(url)\n        ) {\n          // Aozorabunko's (X)HTML support\n          request.overrideMimeType(\"text/html; charset=Shift_JIS\");\n        } else if (/\\.(html|htm)$/.test(url)) {\n          request.overrideMimeType(\"text/html; charset=UTF-8\");\n        } else if (/\\.(xhtml|xht|xml|opf)$/.test(url)) {\n          request.overrideMimeType(\"application/xml; charset=UTF-8\");\n        } else if (/\\.(txt|css)$/.test(url)) {\n          request.overrideMimeType(\"text/plain; charset=UTF-8\");\n        } else {\n          // fallback to HTML\n          request.overrideMimeType(\"text/html; charset=UTF-8\");\n        }\n      } else if (/^data:,(<|%3C|%3c)/.test(url)) {\n        request.overrideMimeType(\"text/html; charset=UTF-8\");\n      } else if (/^data:,/.test(url)) {\n        request.overrideMimeType(\"text/plain; charset=UTF-8\");\n      }\n      request.send(null);\n    }\n  } catch (e) {\n    Logging.logger.warn(e, `Error fetching ${url}`);\n    continuation.schedule(response);\n  }\n  return frame.result();\n}\n\n/**\n * @return Blob\n */\nexport function makeBlob(\n  parts: (string | Blob | ArrayBuffer | ArrayBufferView)[],\n  opt_type?: string,\n): any {\n  const type = opt_type || \"application/octet-stream\";\n  const builderCtr = window[\"WebKitBlobBuilder\"] || window[\"MSBlobBuilder\"]; // deprecated\n  if (builderCtr) {\n    const builder = new builderCtr();\n    for (let i = 0; i < parts.length; i++) {\n      builder.append(parts[i]);\n    }\n    return builder.getBlob(type);\n  }\n  return new Blob(parts, { type });\n}\n\n/**\n * @return Task.Result.<ArrayBuffer>\n */\nexport function readBlob(blob: Blob): any {\n  const frame: Task.Frame<ArrayBuffer> = Task.newFrame(\"readBlob\");\n  const fileReader = new FileReader();\n  const continuation = frame.suspend(fileReader);\n  fileReader.addEventListener(\n    \"load\",\n    () => {\n      continuation.schedule(fileReader.result as ArrayBuffer);\n    },\n    false,\n  );\n  fileReader.readAsArrayBuffer(blob);\n  return frame.result();\n}\n\nexport function revokeObjectURL(url: string): void {\n  (window[\"URL\"] || window[\"webkitURL\"]).revokeObjectURL(url);\n}\n\n/**\n * @return url\n */\nexport function createObjectURL(blob: Blob): string {\n  return (window[\"URL\"] || window[\"webkitURL\"]).createObjectURL(blob);\n}\n\n/**\n * @template Resource\n */\nexport class ResourceStore<Resource> implements Net.ResourceStore<Resource> {\n  resources: { [key: string]: Resource } = {};\n  fetchers: { [key: string]: TaskUtil.Fetcher<Resource> } = {};\n\n  constructor(\n    public readonly parser: (\n      p1: Response,\n      p2: ResourceStore<Resource>,\n    ) => Task.Result<Resource>,\n    public readonly type: XMLHttpRequestResponseType,\n  ) {}\n\n  /**\n   * @return resource for the given URL\n   */\n  load(\n    url: string,\n    opt_required?: boolean,\n    opt_message?: string,\n  ): Task.Result<Resource> {\n    url = Base.stripFragment(url);\n    const resource = this.resources[url];\n    if (typeof resource != \"undefined\") {\n      return Task.newResult(resource);\n    }\n    return this.fetch(url, opt_required, opt_message).get();\n  }\n\n  private fetchInner(\n    url: string,\n    opt_required?: boolean,\n    opt_message?: string,\n  ): Task.Result<Resource> {\n    const self = this;\n    const frame: Task.Frame<Resource> = Task.newFrame(\"fetch\");\n\n    // Hack for TOCView.showTOC()\n    const isTocBox = url.endsWith(\"?viv-toc-box\");\n    if (isTocBox) {\n      url = url.replace(\"?viv-toc-box\", \"\");\n    }\n    const userAgentXmlUrl = Base.resolveURL(\n      \"user-agent.xml\",\n      Base.resourceBaseURL,\n    );\n    const isUserAgentXml = !isTocBox && url === userAgentXmlUrl;\n    if (isUserAgentXml) {\n      // Change \"user-agent.xml\" URL to data URL\n      url = `data:application/xml,${encodeURIComponent(UserAgentXml)}`;\n    }\n\n    ajax(url, self.type).then((response) => {\n      if (response.status >= 400) {\n        if (opt_required) {\n          throw new Error(\n            (opt_message || `Failed to fetch required resource: ${url}`) +\n              ` (${response.status}${\n                response.statusText ? \" \" + response.statusText : \"\"\n              })`,\n          );\n        }\n      }\n      if (isTocBox) {\n        // Hack for TOCView.showTOC()\n        url += \"?viv-toc-box\";\n        response.url += \"?viv-toc-box\";\n      } else if (isUserAgentXml) {\n        // Restore \"user-agent.xml\" URL\n        response.url = url = userAgentXmlUrl;\n      }\n      self.parser(response, self).then((resource) => {\n        delete self.fetchers[url];\n        self.resources[url] = resource;\n        frame.finish(resource);\n      });\n    });\n    return frame.result();\n  }\n\n  /**\n   * @return fetcher for the resource for the given URL\n   */\n  fetch(\n    url: string,\n    opt_required?: boolean,\n    opt_message?: string,\n  ): TaskUtil.Fetcher<Resource> {\n    url = Base.stripFragment(url);\n    const resource = this.resources[url];\n    if (resource) {\n      return null;\n    }\n    let fetcher = this.fetchers[url];\n    if (!fetcher) {\n      const self = this;\n      fetcher = new TaskUtil.Fetcher(\n        () => self.fetchInner(url, opt_required, opt_message),\n        `Fetch ${url}`,\n      );\n      self.fetchers[url] = fetcher;\n      fetcher.start();\n    }\n    return fetcher;\n  }\n\n  get(url: string): XmlDoc.XMLDocHolder {\n    const resource: unknown = this.resources[Base.stripFragment(url)];\n    return resource as XmlDoc.XMLDocHolder;\n  }\n\n  delete(url: string) {\n    delete this.resources[Base.stripFragment(url)];\n  }\n}\n\nexport type JSONStore = ResourceStore<Base.JSON>;\n\nexport function parseJSONResource(\n  response: Response,\n  store: JSONStore,\n): Task.Result<Base.JSON> {\n  const text = response.responseText;\n  return Task.newResult(text ? Base.stringToJSON(text) : null);\n}\n\nexport function newJSONStore(): JSONStore {\n  return new ResourceStore(parseJSONResource, XMLHttpRequestResponseType.TEXT);\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssParser - CSS Parser.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as Exprs from \"./exprs\";\nimport * as Logging from \"./logging\";\nimport * as Net from \"./net\";\nimport * as Task from \"./task\";\n\n/**\n * User agent stylesheet base specificity.\n */\nexport const SPECIFICITY_USER_AGENT: number = 0;\n\n/**\n * User stylesheet base specificity.\n */\nexport const SPECIFICITY_USER: number = 16777216;\n\n/**\n * Author stylesheet (\"normal\" stylesheet) base specificity.\n */\nexport const SPECIFICITY_AUTHOR: number = 33554432;\n\n/**\n * Style attribute base specificity.\n */\nexport const SPECIFICITY_STYLE: number = 50331648;\n\n/**\n * Style attribute base specificity when !important is used.\n */\nexport const SPECIFICITY_STYLE_IMPORTANT: number = 67108864;\n\n/**\n * Author stylesheet base specificity when !important is used.\n */\nexport const SPECIFICITY_AUTHOR_IMPORTANT: number = 83886080;\n\n/**\n * User stylesheet base specificity when !important is used.\n */\nexport const SPECIFICITY_USER_IMPORTANT: number = 100663296;\n\n/**\n * @enum {string}\n */\nexport enum StylesheetFlavor {\n  USER_AGENT = \"UA\",\n  USER = \"User\",\n  AUTHOR = \"Author\",\n}\n\n/**\n * CSS Color value from hash text (without '#' character).\n */\nexport function colorFromHash(text: string): Css.Color {\n  let num = parseInt(text, 16);\n  if (isNaN(num)) {\n    throw new Error(\"E_CSS_COLOR\");\n  }\n  if (text.length == 6) {\n    return new Css.Color(num);\n  }\n  if (text.length == 3) {\n    num =\n      (num & 15) |\n      ((num & 15) << 4) |\n      ((num & 240) << 4) |\n      ((num & 240) << 8) |\n      ((num & 3840) << 8) |\n      ((num & 3840) << 12);\n    return new Css.Color(num);\n  }\n  throw new Error(\"E_CSS_COLOR\");\n}\n\nexport class ParserHandler implements CssTokenizer.TokenizerHandler {\n  flavor: StylesheetFlavor;\n\n  constructor(public scope: Exprs.LexicalScope) {\n    this.flavor = StylesheetFlavor.AUTHOR;\n  }\n\n  getCurrentToken(): CssTokenizer.Token {\n    return null;\n  }\n\n  getScope(): Exprs.LexicalScope {\n    return this.scope;\n  }\n\n  error(mnemonics: string, token: CssTokenizer.Token): void {}\n\n  startStylesheet(flavor: StylesheetFlavor): void {\n    this.flavor = flavor;\n  }\n\n  tagSelector(ns: string | null, name: string | null): void {}\n\n  classSelector(name: string): void {}\n\n  pseudoclassSelector(name: string, params: (number | string)[]): void {}\n\n  pseudoelementSelector(name: string, params: (number | string)[]): void {}\n\n  idSelector(id: string): void {}\n\n  attributeSelector(\n    ns: string,\n    name: string,\n    op: CssTokenizer.TokenType,\n    value: string | null,\n  ): void {}\n\n  descendantSelector(): void {}\n\n  childSelector(): void {}\n\n  adjacentSiblingSelector(): void {}\n\n  followingSiblingSelector(): void {}\n\n  nextSelector(): void {}\n\n  startSelectorRule(): void {}\n\n  startFontFaceRule(): void {}\n\n  startFootnoteRule(pseudoelem: string | null): void {}\n\n  startViewportRule(): void {}\n\n  startDefineRule(): void {}\n\n  startRegionRule(): void {}\n\n  startPageRule(): void {}\n\n  startPageMarginBoxRule(name: string): void {}\n\n  startWhenRule(expr: Css.Expr): void {}\n\n  startMediaRule(expr: Css.Expr): void {\n    this.startWhenRule(expr);\n  }\n\n  startFlowRule(flowName: string): void {}\n\n  startPageTemplateRule(): void {}\n\n  startPageMasterRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {}\n\n  startPartitionRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {}\n\n  startPartitionGroupRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {}\n\n  startRuleBody(): void {}\n\n  property(name: string, value: Css.Val, important: boolean): void {}\n\n  endRule(): void {}\n\n  /**\n   * @param funcName The name of the function taking a selector list as an\n   *     argument\n   */\n  startFuncWithSelector(funcName: string): void {}\n\n  endFuncWithSelector(): void {}\n\n  getImportantSpecificity(): number {\n    switch (this.flavor) {\n      case StylesheetFlavor.USER_AGENT:\n        return SPECIFICITY_USER_AGENT;\n      case StylesheetFlavor.USER:\n        return SPECIFICITY_USER_IMPORTANT;\n      default:\n        return SPECIFICITY_AUTHOR_IMPORTANT;\n    }\n  }\n\n  getBaseSpecificity(): number {\n    switch (this.flavor) {\n      case StylesheetFlavor.USER_AGENT:\n        return SPECIFICITY_USER_AGENT;\n      case StylesheetFlavor.USER:\n        return SPECIFICITY_USER;\n      default:\n        return SPECIFICITY_AUTHOR;\n    }\n  }\n}\n\nexport class DispatchParserHandler extends ParserHandler {\n  stack: ParserHandler[] = [];\n  tokenizer: CssTokenizer.Tokenizer = null;\n  slave: ParserHandler = null;\n\n  constructor() {\n    super(null);\n  }\n\n  pushHandler(slave: ParserHandler): void {\n    this.stack.push(this.slave);\n    this.slave = slave;\n  }\n\n  popHandler(): void {\n    this.slave = this.stack.pop();\n  }\n\n  /**\n   * @override\n   */\n  getCurrentToken(): CssTokenizer.Token {\n    if (this.tokenizer) {\n      return this.tokenizer.token();\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  getScope(): Exprs.LexicalScope {\n    return this.slave.getScope();\n  }\n\n  /**\n   * Forwards call to slave.\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    this.slave.error(mnemonics, token);\n  }\n\n  /**\n   * Called by a slave.\n   */\n  errorMsg(mnemonics: string, token: CssTokenizer.Token): void {\n    Logging.logger.warn(mnemonics);\n  }\n\n  /**\n   * @override\n   */\n  startStylesheet(flavor: StylesheetFlavor): void {\n    super.startStylesheet(flavor);\n    if (this.stack.length > 0) {\n      // This can occur as a result of an error\n      this.slave = this.stack[0];\n      this.stack = [];\n    }\n    this.slave.startStylesheet(flavor);\n  }\n\n  /**\n   * @override\n   */\n  tagSelector(ns: string | null, name: string | null): void {\n    this.slave.tagSelector(ns, name);\n  }\n\n  /**\n   * @override\n   */\n  classSelector(name: string): void {\n    this.slave.classSelector(name);\n  }\n\n  /**\n   * @override\n   */\n  pseudoclassSelector(name: string, params: (number | string)[]): void {\n    this.slave.pseudoclassSelector(name, params);\n  }\n\n  /**\n   * @override\n   */\n  pseudoelementSelector(name: string, params: (number | string)[]): void {\n    this.slave.pseudoelementSelector(name, params);\n  }\n\n  /**\n   * @override\n   */\n  idSelector(id: string): void {\n    this.slave.idSelector(id);\n  }\n\n  /**\n   * @override\n   */\n  attributeSelector(\n    ns: string,\n    name: string,\n    op: CssTokenizer.TokenType,\n    value: string | null,\n  ): void {\n    this.slave.attributeSelector(ns, name, op, value);\n  }\n\n  /**\n   * @override\n   */\n  descendantSelector(): void {\n    this.slave.descendantSelector();\n  }\n\n  /**\n   * @override\n   */\n  childSelector(): void {\n    this.slave.childSelector();\n  }\n\n  /**\n   * @override\n   */\n  adjacentSiblingSelector(): void {\n    this.slave.adjacentSiblingSelector();\n  }\n\n  /**\n   * @override\n   */\n  followingSiblingSelector(): void {\n    this.slave.followingSiblingSelector();\n  }\n\n  /**\n   * @override\n   */\n  nextSelector(): void {\n    this.slave.nextSelector();\n  }\n\n  /**\n   * @override\n   */\n  startSelectorRule(): void {\n    this.slave.startSelectorRule();\n  }\n\n  /**\n   * @override\n   */\n  startFontFaceRule(): void {\n    this.slave.startFontFaceRule();\n  }\n\n  /**\n   * @override\n   */\n  startFootnoteRule(pseudoelem: string | null): void {\n    this.slave.startFootnoteRule(pseudoelem);\n  }\n\n  /**\n   * @override\n   */\n  startViewportRule(): void {\n    this.slave.startViewportRule();\n  }\n\n  /**\n   * @override\n   */\n  startDefineRule(): void {\n    this.slave.startDefineRule();\n  }\n\n  /**\n   * @override\n   */\n  startRegionRule(): void {\n    this.slave.startRegionRule();\n  }\n\n  /**\n   * @override\n   */\n  startPageRule(): void {\n    this.slave.startPageRule();\n  }\n\n  /**\n   * @override\n   */\n  startPageMarginBoxRule(name: string): void {\n    this.slave.startPageMarginBoxRule(name);\n  }\n\n  /**\n   * @override\n   */\n  startWhenRule(expr: Css.Expr): void {\n    this.slave.startWhenRule(expr);\n  }\n\n  /**\n   * @override\n   */\n  startFlowRule(flowName: string): void {\n    this.slave.startFlowRule(flowName);\n  }\n\n  /**\n   * @override\n   */\n  startPageTemplateRule(): void {\n    this.slave.startPageTemplateRule();\n  }\n\n  /**\n   * @override\n   */\n  startPageMasterRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.slave.startPageMasterRule(name, pseudoName, classes);\n  }\n\n  /**\n   * @override\n   */\n  startPartitionRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.slave.startPartitionRule(name, pseudoName, classes);\n  }\n\n  /**\n   * @override\n   */\n  startPartitionGroupRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.slave.startPartitionGroupRule(name, pseudoName, classes);\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    this.slave.startRuleBody();\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.slave.property(name, value, important);\n  }\n\n  /**\n   * @override\n   */\n  endRule(): void {\n    this.slave.endRule();\n  }\n\n  /**\n   * @override\n   */\n  startFuncWithSelector(funcName: string): void {\n    this.slave.startFuncWithSelector(funcName);\n  }\n\n  /**\n   * @override\n   */\n  endFuncWithSelector(): void {\n    this.slave.endFuncWithSelector();\n  }\n}\n\nexport class SkippingParserHandler extends ParserHandler {\n  depth: number = 0;\n  flavor: StylesheetFlavor;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    public owner: DispatchParserHandler,\n    public readonly topLevel,\n  ) {\n    super(scope);\n    if (owner) {\n      this.flavor = owner.flavor;\n    }\n  }\n\n  /**\n   * @override\n   */\n  getCurrentToken(): CssTokenizer.Token {\n    return this.owner.getCurrentToken();\n  }\n\n  /**\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    this.owner.errorMsg(mnemonics, token);\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    this.depth++;\n  }\n\n  /**\n   * @override\n   */\n  endRule(): void {\n    if (--this.depth == 0 && !this.topLevel) {\n      this.owner.popHandler();\n    }\n  }\n}\n\nexport class SlaveParserHandler extends SkippingParserHandler {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: DispatchParserHandler,\n    topLevel: boolean,\n  ) {\n    super(scope, owner, topLevel);\n  }\n\n  report(message: string): void {\n    this.error(message, this.getCurrentToken());\n  }\n\n  reportAndSkip(message: string): void {\n    this.report(message);\n    this.owner.pushHandler(\n      new SkippingParserHandler(this.scope, this.owner, false),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startSelectorRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_SELECTOR\");\n  }\n\n  /**\n   * @override\n   */\n  startFontFaceRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_FONT_FACE\");\n  }\n\n  /**\n   * @override\n   */\n  startFootnoteRule(pseudoelem: string | null): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_FOOTNOTE\");\n  }\n\n  /**\n   * @override\n   */\n  startViewportRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_VIEWPORT\");\n  }\n\n  /**\n   * @override\n   */\n  startDefineRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_DEFINE\");\n  }\n\n  /**\n   * @override\n   */\n  startRegionRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_REGION\");\n  }\n\n  /**\n   * @override\n   */\n  startPageRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_PAGE\");\n  }\n\n  /**\n   * @override\n   */\n  startWhenRule(expr: Css.Expr): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_WHEN\");\n  }\n\n  /**\n   * @override\n   */\n  startFlowRule(flowName: string): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_FLOW\");\n  }\n\n  /**\n   * @override\n   */\n  startPageTemplateRule(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_PAGE_TEMPLATE\");\n  }\n\n  /**\n   * @override\n   */\n  startPageMasterRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_PAGE_MASTER\");\n  }\n\n  /**\n   * @override\n   */\n  startPartitionRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_PARTITION\");\n  }\n\n  /**\n   * @override\n   */\n  startPartitionGroupRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_PARTITION_GROUP\");\n  }\n\n  /**\n   * @override\n   */\n  startFuncWithSelector(funcName: string): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_SELECTOR_FUNC\");\n  }\n\n  /**\n   * @override\n   */\n  endFuncWithSelector(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_END_SELECTOR_FUNC\");\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.error(\"E_CSS_UNEXPECTED_PROPERTY\", this.getCurrentToken());\n  }\n}\n\nexport const actionsBase: Action[] = [];\n\nexport const actionsStyleAttribute: Action[] = [];\n\nexport const actionsSelector: Action[] = [];\n\nexport const actionsSelectorInFunc: Action[] = [];\n\nexport const actionsSelectorCont: Action[] = [];\n\nexport const actionsSelectorStart: Action[] = [];\n\nexport const actionsPropVal: Action[] = [];\n\nexport const actionsExprVal: Action[] = [];\n\nexport const actionsExprOp: Action[] = [];\n\nexport const actionsError: Action[] = [];\n\nexport const actionsErrorDecl: Action[] = [];\n\nexport const actionsErrorSelector: Action[] = [];\n\nexport const priority: number[] = [];\n\n/**\n * @enum {number}\n */\nexport enum Action {\n  SELECTOR_NAME_1 = 1,\n  SELECTOR_NAME,\n  SELECTOR_ANY_1,\n  SELECTOR_ANY,\n  SELECTOR_ID_1,\n  SELECTOR_ID,\n  SELECTOR_CLASS_1,\n  SELECTOR_CLASS,\n  SELECTOR_ATTR_1,\n  SELECTOR_ATTR,\n  SELECTOR_CHILD,\n  SELECTOR_SIBLING,\n  SELECTOR_BODY,\n  SELECTOR_PSEUDOCLASS,\n  VAL_IDENT,\n  VAL_HASH,\n  VAL_NUM,\n  VAL_INT,\n  VAL_NUMERIC,\n  VAL_STR,\n  VAL_URL,\n  VAL_COMMA,\n  VAL_SLASH,\n  VAL_FUNC,\n  VAL_C_PAR,\n  VAL_END,\n  RULE_END,\n  IDENT,\n  SELECTOR_START,\n  AT,\n  EXPR_IDENT,\n  EXPR_NUM,\n  EXPR_NUMERIC,\n  EXPR_STR,\n  EXPR_PARAM,\n  EXPR_PREFIX,\n  EXPR_INFIX,\n  EXPR_FUNC,\n  EXPR_C_PAR,\n  EXPR_O_PAR,\n  SELECTOR_NEXT,\n  SELECTOR_PSEUDOELEM,\n  EXPR_O_BRC,\n  VAL_FINISH,\n  EXPR_INFIX_NAME,\n  PROP,\n  VAL_BANG,\n  VAL_BRC,\n  EXPR_SEMICOL,\n  ERROR_PUSH,\n  ERROR_POP,\n  ERROR_POP_DECL,\n  ERROR_SEMICOL,\n  VAL_PLUS,\n  SELECTOR_PSEUDOCLASS_1,\n  SELECTOR_FOLLOWING_SIBLING,\n  DONE = 200,\n}\n\nexport const OP_MEDIA_AND: number = CssTokenizer.TokenType.LAST + 1;\n\n(() => {\n  actionsBase[CssTokenizer.TokenType.IDENT] = Action.IDENT;\n  actionsBase[CssTokenizer.TokenType.STAR] = Action.SELECTOR_START;\n  actionsBase[CssTokenizer.TokenType.HASH] = Action.SELECTOR_START;\n  actionsBase[CssTokenizer.TokenType.CLASS] = Action.SELECTOR_START;\n  actionsBase[CssTokenizer.TokenType.O_BRK] = Action.SELECTOR_START;\n  actionsBase[CssTokenizer.TokenType.COLON] = Action.SELECTOR_START;\n  actionsBase[CssTokenizer.TokenType.AT] = Action.AT;\n  actionsBase[CssTokenizer.TokenType.C_BRC] = Action.RULE_END;\n  actionsBase[CssTokenizer.TokenType.EOF] = Action.DONE;\n  actionsStyleAttribute[CssTokenizer.TokenType.IDENT] = Action.PROP;\n  actionsStyleAttribute[CssTokenizer.TokenType.EOF] = Action.DONE;\n  actionsSelectorStart[CssTokenizer.TokenType.IDENT] = Action.SELECTOR_NAME;\n  actionsSelectorStart[CssTokenizer.TokenType.STAR] = Action.SELECTOR_ANY;\n  actionsSelectorStart[CssTokenizer.TokenType.HASH] = Action.SELECTOR_ID;\n  actionsSelectorStart[CssTokenizer.TokenType.CLASS] = Action.SELECTOR_CLASS;\n  actionsSelectorStart[CssTokenizer.TokenType.O_BRK] = Action.SELECTOR_ATTR;\n  actionsSelectorStart[CssTokenizer.TokenType.COLON] =\n    Action.SELECTOR_PSEUDOCLASS;\n\n  actionsSelector[CssTokenizer.TokenType.GT] = Action.SELECTOR_CHILD;\n  actionsSelector[CssTokenizer.TokenType.PLUS] = Action.SELECTOR_SIBLING;\n  actionsSelector[CssTokenizer.TokenType.TILDE] =\n    Action.SELECTOR_FOLLOWING_SIBLING;\n  actionsSelector[CssTokenizer.TokenType.IDENT] = Action.SELECTOR_NAME_1;\n  actionsSelector[CssTokenizer.TokenType.STAR] = Action.SELECTOR_ANY_1;\n  actionsSelector[CssTokenizer.TokenType.HASH] = Action.SELECTOR_ID_1;\n  actionsSelector[CssTokenizer.TokenType.CLASS] = Action.SELECTOR_CLASS_1;\n  actionsSelector[CssTokenizer.TokenType.O_BRK] = Action.SELECTOR_ATTR_1;\n  actionsSelector[CssTokenizer.TokenType.O_BRC] = Action.SELECTOR_BODY;\n  actionsSelector[CssTokenizer.TokenType.COLON] = Action.SELECTOR_PSEUDOCLASS_1;\n  actionsSelector[CssTokenizer.TokenType.COL_COL] = Action.SELECTOR_PSEUDOELEM;\n  actionsSelector[CssTokenizer.TokenType.COMMA] = Action.SELECTOR_NEXT;\n  actionsSelectorInFunc[CssTokenizer.TokenType.IDENT] = Action.SELECTOR_NAME_1;\n  actionsSelectorInFunc[CssTokenizer.TokenType.STAR] = Action.SELECTOR_ANY_1;\n  actionsSelectorInFunc[CssTokenizer.TokenType.HASH] = Action.SELECTOR_ID_1;\n  actionsSelectorInFunc[CssTokenizer.TokenType.CLASS] = Action.SELECTOR_CLASS_1;\n  actionsSelectorInFunc[CssTokenizer.TokenType.O_BRK] = Action.SELECTOR_ATTR_1;\n  actionsSelectorInFunc[CssTokenizer.TokenType.C_PAR] = Action.DONE;\n  actionsSelectorInFunc[CssTokenizer.TokenType.COLON] =\n    Action.SELECTOR_PSEUDOCLASS_1;\n  actionsSelectorCont[CssTokenizer.TokenType.IDENT] = Action.SELECTOR_NAME;\n  actionsSelectorCont[CssTokenizer.TokenType.STAR] = Action.SELECTOR_ANY;\n  actionsSelectorCont[CssTokenizer.TokenType.HASH] = Action.SELECTOR_ID;\n  actionsSelectorCont[CssTokenizer.TokenType.CLASS] = Action.SELECTOR_CLASS;\n  actionsSelectorCont[CssTokenizer.TokenType.COLON] =\n    Action.SELECTOR_PSEUDOCLASS;\n  actionsSelectorCont[CssTokenizer.TokenType.COL_COL] =\n    Action.SELECTOR_PSEUDOELEM;\n  actionsSelectorCont[CssTokenizer.TokenType.O_BRK] = Action.SELECTOR_ATTR;\n  actionsSelectorCont[CssTokenizer.TokenType.O_BRC] = Action.SELECTOR_BODY;\n  actionsPropVal[CssTokenizer.TokenType.IDENT] = Action.VAL_IDENT;\n  actionsPropVal[CssTokenizer.TokenType.HASH] = Action.VAL_HASH;\n  actionsPropVal[CssTokenizer.TokenType.NUM] = Action.VAL_NUM;\n  actionsPropVal[CssTokenizer.TokenType.INT] = Action.VAL_INT;\n  actionsPropVal[CssTokenizer.TokenType.NUMERIC] = Action.VAL_NUMERIC;\n  actionsPropVal[CssTokenizer.TokenType.STR] = Action.VAL_STR;\n  actionsPropVal[CssTokenizer.TokenType.URL] = Action.VAL_URL;\n  actionsPropVal[CssTokenizer.TokenType.COMMA] = Action.VAL_COMMA;\n  actionsPropVal[CssTokenizer.TokenType.SLASH] = Action.VAL_SLASH;\n  actionsPropVal[CssTokenizer.TokenType.FUNC] = Action.VAL_FUNC;\n  actionsPropVal[CssTokenizer.TokenType.C_PAR] = Action.VAL_C_PAR;\n  actionsPropVal[CssTokenizer.TokenType.SEMICOL] = Action.VAL_END;\n  actionsPropVal[CssTokenizer.TokenType.C_BRC] = Action.VAL_BRC;\n  actionsPropVal[CssTokenizer.TokenType.BANG] = Action.VAL_BANG;\n  actionsPropVal[CssTokenizer.TokenType.PLUS] = Action.VAL_PLUS;\n  actionsPropVal[CssTokenizer.TokenType.EOF] = Action.VAL_FINISH;\n  actionsExprVal[CssTokenizer.TokenType.IDENT] = Action.EXPR_IDENT;\n  actionsExprVal[CssTokenizer.TokenType.NUM] = Action.EXPR_NUM;\n  actionsExprVal[CssTokenizer.TokenType.INT] = Action.EXPR_NUM;\n  actionsExprVal[CssTokenizer.TokenType.NUMERIC] = Action.EXPR_NUMERIC;\n  actionsExprVal[CssTokenizer.TokenType.STR] = Action.EXPR_STR;\n  actionsExprVal[CssTokenizer.TokenType.O_PAR] = Action.EXPR_O_PAR;\n  actionsExprVal[CssTokenizer.TokenType.FUNC] = Action.EXPR_FUNC;\n  actionsExprVal[CssTokenizer.TokenType.BANG] = Action.EXPR_PREFIX;\n  actionsExprVal[CssTokenizer.TokenType.MINUS] = Action.EXPR_PREFIX;\n  actionsExprVal[CssTokenizer.TokenType.DOLLAR] = Action.EXPR_PARAM;\n  actionsExprOp[CssTokenizer.TokenType.IDENT] = Action.EXPR_INFIX_NAME;\n  actionsExprOp[CssTokenizer.TokenType.COMMA] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.GT] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.LT] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.GT_EQ] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.LT_EQ] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.EQ] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.EQ_EQ] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.BANG_EQ] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.AMP_AMP] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.BAR_BAR] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.PLUS] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.MINUS] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.SLASH] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.PERCENT] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.STAR] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.COLON] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.QMARK] = Action.EXPR_INFIX;\n  actionsExprOp[CssTokenizer.TokenType.C_PAR] = Action.EXPR_C_PAR;\n  actionsExprOp[CssTokenizer.TokenType.O_BRC] = Action.EXPR_O_BRC;\n  actionsExprOp[CssTokenizer.TokenType.SEMICOL] = Action.EXPR_SEMICOL;\n  actionsError[CssTokenizer.TokenType.EOF] = Action.DONE;\n  actionsError[CssTokenizer.TokenType.O_BRC] = Action.ERROR_PUSH;\n  actionsError[CssTokenizer.TokenType.C_BRC] = Action.ERROR_POP;\n  actionsError[CssTokenizer.TokenType.O_BRK] = Action.ERROR_PUSH;\n  actionsError[CssTokenizer.TokenType.C_BRK] = Action.ERROR_POP;\n  actionsError[CssTokenizer.TokenType.O_PAR] = Action.ERROR_PUSH;\n  actionsError[CssTokenizer.TokenType.C_PAR] = Action.ERROR_POP;\n  actionsError[CssTokenizer.TokenType.SEMICOL] = Action.ERROR_SEMICOL;\n  actionsErrorDecl[CssTokenizer.TokenType.EOF] = Action.DONE;\n  actionsErrorDecl[CssTokenizer.TokenType.O_BRC] = Action.ERROR_PUSH;\n  actionsErrorDecl[CssTokenizer.TokenType.C_BRC] = Action.ERROR_POP_DECL;\n  actionsErrorDecl[CssTokenizer.TokenType.O_BRK] = Action.ERROR_PUSH;\n  actionsErrorDecl[CssTokenizer.TokenType.C_BRK] = Action.ERROR_POP;\n  actionsErrorDecl[CssTokenizer.TokenType.O_PAR] = Action.ERROR_PUSH;\n  actionsErrorDecl[CssTokenizer.TokenType.C_PAR] = Action.ERROR_POP;\n  actionsErrorDecl[CssTokenizer.TokenType.SEMICOL] = Action.ERROR_SEMICOL;\n  actionsErrorSelector[CssTokenizer.TokenType.EOF] = Action.DONE;\n  actionsErrorSelector[CssTokenizer.TokenType.O_BRC] = Action.ERROR_PUSH;\n  actionsErrorSelector[CssTokenizer.TokenType.C_BRC] = Action.ERROR_POP;\n  actionsErrorSelector[CssTokenizer.TokenType.O_BRK] = Action.ERROR_PUSH;\n  actionsErrorSelector[CssTokenizer.TokenType.C_BRK] = Action.ERROR_POP;\n  actionsErrorSelector[CssTokenizer.TokenType.O_PAR] = Action.ERROR_PUSH;\n  actionsErrorSelector[CssTokenizer.TokenType.C_PAR] = Action.ERROR_POP;\n  priority[CssTokenizer.TokenType.C_PAR] = 0;\n  priority[CssTokenizer.TokenType.COMMA] = 0;\n  priority[CssTokenizer.TokenType.QMARK] = 1;\n  priority[CssTokenizer.TokenType.COLON] = 1;\n  priority[CssTokenizer.TokenType.AMP_AMP] = 2;\n  priority[CssTokenizer.TokenType.BAR_BAR] = 2;\n  priority[CssTokenizer.TokenType.LT] = 3;\n  priority[CssTokenizer.TokenType.GT] = 3;\n  priority[CssTokenizer.TokenType.LT_EQ] = 3;\n  priority[CssTokenizer.TokenType.GT_EQ] = 3;\n  priority[CssTokenizer.TokenType.EQ] = 3;\n  priority[CssTokenizer.TokenType.EQ_EQ] = 3;\n  priority[CssTokenizer.TokenType.BANG_EQ] = 3;\n  priority[CssTokenizer.TokenType.PLUS] = 4;\n  priority[CssTokenizer.TokenType.MINUS] = 4;\n  priority[CssTokenizer.TokenType.STAR] = 5;\n  priority[CssTokenizer.TokenType.SLASH] = 5;\n  priority[CssTokenizer.TokenType.PERCENT] = 5;\n  priority[CssTokenizer.TokenType.EOF] = 6;\n  priority[OP_MEDIA_AND] = 2;\n})();\n\n/**\n * @enum {number}\n */\nexport enum ExprContext {\n  PROP,\n  WHEN,\n  MEDIA,\n  IMPORT,\n}\n\nexport class Parser {\n  valStack: any[] = [];\n  namespacePrefixToURI: { [key: string]: string } = {};\n  defaultNamespaceURI: string | null = null;\n  propName: string | null = null;\n  propImportant: boolean = false;\n  exprContext: ExprContext;\n  result: Css.Val = null;\n  importReady: boolean = false;\n  importURL: string | null = null;\n  importCondition: Css.Expr = null;\n  errorBrackets: number[] = [];\n  ruleStack: string[] = [];\n  regionRule: boolean = false;\n  pageRule: boolean = false;\n\n  constructor(\n    public actions: Action[],\n    public tokenizer: CssTokenizer.Tokenizer,\n    public readonly handler: ParserHandler,\n    public baseURL: string,\n  ) {\n    this.exprContext = ExprContext.MEDIA;\n  }\n\n  extractVals(sep: string, index: number): Css.Val[] {\n    const arr: Css.Val[] = [];\n    const valStack = this.valStack;\n    while (true) {\n      arr.push(valStack[index++] as Css.Val);\n      if (index == valStack.length) {\n        break;\n      }\n      if (valStack[index++] != sep) {\n        throw new Error(\"Unexpected state\");\n      }\n    }\n    return arr;\n  }\n\n  valStackReduce(sep: string, token: CssTokenizer.Token): Css.Val {\n    const valStack = this.valStack;\n    let index = valStack.length;\n    let v;\n    do {\n      v = valStack[--index];\n    } while (typeof v != \"undefined\" && typeof v != \"string\");\n    let count = valStack.length - (index + 1);\n    if (count > 1) {\n      valStack.splice(\n        index + 1,\n        count,\n        new Css.SpaceList(valStack.slice(index + 1, valStack.length)),\n      );\n    }\n    if (sep == \",\") {\n      return null;\n    }\n    index++;\n    do {\n      v = valStack[--index];\n    } while (typeof v != \"undefined\" && (typeof v != \"string\" || v == \",\"));\n    count = valStack.length - (index + 1);\n    if (v == \"(\") {\n      if (sep != \")\") {\n        this.handler.error(\"E_CSS_MISMATCHED_C_PAR\", token);\n        this.actions = actionsErrorDecl;\n        return null;\n      }\n      const func = new Css.Func(\n        valStack[index - 1] as string,\n        this.extractVals(\",\", index + 1),\n      );\n      valStack.splice(index - 1, count + 2, func);\n      return null;\n    }\n    if (sep != \";\" || index >= 0) {\n      this.handler.error(\"E_CSS_UNEXPECTED_VAL_END\", token);\n      this.actions = actionsErrorDecl;\n      return null;\n    }\n    if (count > 1) {\n      return new Css.CommaList(this.extractVals(\",\", index + 1));\n    }\n    return valStack[0] as Css.Val;\n  }\n\n  exprError(mnemonics: string, token: CssTokenizer.Token) {\n    this.actions = this.propName ? actionsErrorDecl : actionsError;\n    this.handler.error(mnemonics, token);\n  }\n\n  exprStackReduce(op: number, token: CssTokenizer.Token): boolean {\n    const valStack = this.valStack;\n    const handler = this.handler;\n    let val = valStack.pop() as Exprs.Val;\n    let val2: Exprs.Val;\n    while (true) {\n      let tok = valStack.pop();\n      if (op == CssTokenizer.TokenType.C_PAR) {\n        const args: Exprs.Val[] = [val];\n        while (tok == CssTokenizer.TokenType.COMMA) {\n          args.unshift(valStack.pop());\n          tok = valStack.pop();\n        }\n        if (typeof tok == \"string\") {\n          if (tok == \"{\") {\n            // reached CSS portion of the stack\n            while (args.length >= 2) {\n              const e1 = args.shift();\n              const e2 = args.shift();\n              const er = new Exprs.OrMedia(handler.getScope(), e1, e2);\n              args.unshift(er);\n            }\n            valStack.push(new Css.Expr(args[0]));\n            return true;\n          } else if (tok == \"(\") {\n            // call\n            const name2 = valStack.pop() as string;\n            const name1 = valStack.pop() as string | null;\n            val = new Exprs.Call(\n              handler.getScope(),\n              Exprs.makeQualifiedName(name1, name2),\n              args,\n            );\n            op = CssTokenizer.TokenType.EOF;\n            continue;\n          }\n        }\n        if (tok == CssTokenizer.TokenType.O_PAR) {\n          if (val.isMediaName()) {\n            val = new Exprs.MediaTest(\n              handler.getScope(),\n              val as Exprs.MediaName,\n              null,\n            );\n          }\n          op = CssTokenizer.TokenType.EOF;\n          continue;\n        }\n      } else {\n        if (typeof tok == \"string\") {\n          // reached CSS portion of the stack or a call\n          valStack.push(tok);\n          break;\n        }\n      }\n      if ((tok as number) < 0) {\n        // prefix\n        if (tok == -CssTokenizer.TokenType.BANG) {\n          val = new Exprs.Not(handler.getScope(), val);\n        } else if (tok == -CssTokenizer.TokenType.MINUS) {\n          val = new Exprs.Negate(handler.getScope(), val);\n        } else {\n          this.exprError(\"F_UNEXPECTED_STATE\", token);\n          return false;\n        }\n      } else {\n        // infix\n        if (priority[op] > priority[tok as number]) {\n          valStack.push(tok);\n          break;\n        }\n        val2 = valStack.pop() as Exprs.Val;\n        switch (tok) {\n          case CssTokenizer.TokenType.AMP_AMP:\n            val = new Exprs.And(handler.getScope(), val2, val);\n            break;\n          case OP_MEDIA_AND:\n            val = new Exprs.AndMedia(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.BAR_BAR:\n            val = new Exprs.Or(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.LT:\n            val = new Exprs.Lt(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.GT:\n            val = new Exprs.Gt(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.LT_EQ:\n            val = new Exprs.Le(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.GT_EQ:\n            val = new Exprs.Ge(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.EQ:\n          case CssTokenizer.TokenType.EQ_EQ:\n            val = new Exprs.Eq(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.BANG_EQ:\n            val = new Exprs.Ne(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.PLUS:\n            val = new Exprs.Add(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.MINUS:\n            val = new Exprs.Subtract(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.STAR:\n            val = new Exprs.Multiply(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.SLASH:\n            val = new Exprs.Divide(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.PERCENT:\n            val = new Exprs.Modulo(handler.getScope(), val2, val);\n            break;\n          case CssTokenizer.TokenType.COLON:\n            if (valStack.length > 1) {\n              switch (valStack[valStack.length - 1]) {\n                case CssTokenizer.TokenType.QMARK:\n                  valStack.pop();\n                  val = new Exprs.Cond(\n                    handler.getScope(),\n                    valStack.pop() as Exprs.Val,\n                    val2,\n                    val,\n                  );\n                  break;\n                case CssTokenizer.TokenType.O_PAR:\n                  if (val2.isMediaName()) {\n                    val = new Exprs.MediaTest(\n                      handler.getScope(),\n                      val2 as Exprs.MediaName,\n                      val,\n                    );\n                  } else {\n                    this.exprError(\"E_CSS_MEDIA_TEST\", token);\n                    return false;\n                  }\n                  break;\n              }\n            } else {\n              this.exprError(\"E_CSS_EXPR_COND\", token);\n              return false;\n            }\n            break;\n          case CssTokenizer.TokenType.QMARK:\n            if (op != CssTokenizer.TokenType.COLON) {\n              this.exprError(\"E_CSS_EXPR_COND\", token);\n              return false;\n            }\n\n          // fall through\n          case CssTokenizer.TokenType.O_PAR:\n            // don't reduce\n            valStack.push(val2);\n            valStack.push(tok);\n            valStack.push(val);\n            return false;\n          default:\n            this.exprError(\"F_UNEXPECTED_STATE\", token);\n            return false;\n        }\n      }\n    }\n    valStack.push(val);\n    return false;\n  }\n\n  readPseudoParams(): (number | string)[] {\n    const arr = [];\n    while (true) {\n      const token = this.tokenizer.token();\n      switch (token.type) {\n        case CssTokenizer.TokenType.IDENT:\n          arr.push(token.text);\n          break;\n        case CssTokenizer.TokenType.PLUS:\n          arr.push(\"+\");\n          break;\n        case CssTokenizer.TokenType.NUM:\n        case CssTokenizer.TokenType.INT:\n          arr.push(token.num);\n          break;\n        default:\n          return arr;\n      }\n      this.tokenizer.consume();\n    }\n  }\n\n  /**\n   * Read `an+b` argument of pseudoclasses. Roughly based on the algorithm at\n   * https://drafts.csswg.org/css-syntax/#the-anb-type\n   */\n  private readNthPseudoParams(): number[] | null {\n    let hasLeadingPlus = false;\n    let token = this.tokenizer.token();\n    if (token.type === CssTokenizer.TokenType.PLUS) {\n      // '+'\n      hasLeadingPlus = true;\n      this.tokenizer.consume();\n      token = this.tokenizer.token();\n    } else if (\n      token.type === CssTokenizer.TokenType.IDENT &&\n      (token.text === \"even\" || token.text === \"odd\")\n    ) {\n      // 'even' or 'odd'\n      this.tokenizer.consume();\n      return [2, token.text === \"odd\" ? 1 : 0];\n    }\n    switch (token.type) {\n      case CssTokenizer.TokenType.NUMERIC:\n        if (hasLeadingPlus && token.num < 0) {\n          // reject '+-an'\n          return null;\n        }\n\n      // FALLTHROUGH\n      case CssTokenizer.TokenType.IDENT:\n        if (hasLeadingPlus && token.text.charAt(0) === \"-\") {\n          // reject '+-n'\n          return null;\n        }\n        if (token.text === \"n\" || token.text === \"-n\") {\n          // 'an', 'an +b', 'an -b', 'n', 'n +b', 'n -b', '-n', '-n +b' '-n -b'\n          if (hasLeadingPlus && token.precededBySpace) {\n            // reject '+ an'\n            return null;\n          }\n          let a = token.text === \"-n\" ? -1 : 1;\n          if (token.type === CssTokenizer.TokenType.NUMERIC) {\n            a = token.num;\n          }\n          let b = 0;\n          this.tokenizer.consume();\n          token = this.tokenizer.token();\n          const hasMinusSign = token.type === CssTokenizer.TokenType.MINUS;\n          const hasSign =\n            token.type === CssTokenizer.TokenType.PLUS || hasMinusSign;\n          if (hasSign) {\n            // 'an +b', 'an - b'\n            this.tokenizer.consume();\n            token = this.tokenizer.token();\n          }\n          if (token.type === CssTokenizer.TokenType.INT) {\n            b = token.num;\n\n            if (1 / b === 1 / -0) {\n              // negative zero: 'an -0'\n              b = 0;\n              if (hasSign) {\n                return null; // reject 'an + -0', 'an - -0'\n              }\n            } else if (b < 0) {\n              // negative: 'an -b'\n              if (hasSign) {\n                return null; // reject 'an + -b', 'an - -b'\n              }\n            } else if (b >= 0) {\n              // positive or positive zero: 'an +b'\n              if (!hasSign) {\n                return null;\n              }\n            }\n            this.tokenizer.consume();\n          } else if (hasSign) {\n            // reject 'an + (non-integer)'\n            return null;\n          }\n          return [a, hasMinusSign && b > 0 ? -b : b];\n        } else if (token.text === \"n-\" || token.text === \"-n-\") {\n          // 'an- b', '-n- b'\n          if (hasLeadingPlus && token.precededBySpace) {\n            // reject '+ an- b'\n            return null;\n          }\n          let a = token.text === \"-n-\" ? -1 : 1;\n          if (token.type === CssTokenizer.TokenType.NUMERIC) {\n            a = token.num;\n          }\n          this.tokenizer.consume();\n          token = this.tokenizer.token();\n          if (token.type === CssTokenizer.TokenType.INT) {\n            if (token.num < 0 || 1 / token.num === 1 / -0) {\n              // reject 'an- -b', 'an- -0'\n              return null;\n            } else {\n              this.tokenizer.consume();\n              return [a, token.num];\n            }\n          }\n        } else {\n          let r = token.text.match(/^n(-[0-9]+)$/);\n          if (r) {\n            // 'n-b', 'an-b'\n            if (hasLeadingPlus && token.precededBySpace) {\n              // reject '+ an-b'\n              return null;\n            }\n            this.tokenizer.consume();\n            return [\n              token.type === CssTokenizer.TokenType.NUMERIC ? token.num : 1,\n              parseInt(r[1], 10),\n            ];\n          }\n          r = token.text.match(/^-n(-[0-9]+)$/);\n\n          // '-n-b'\n          if (r) {\n            this.tokenizer.consume();\n            return [-1, parseInt(r[1], 10)];\n          }\n        }\n        return null;\n      case CssTokenizer.TokenType.INT:\n        if (hasLeadingPlus && (token.precededBySpace || token.num < 0)) {\n          return null;\n        }\n        this.tokenizer.consume();\n        return [0, token.num];\n    }\n    return null;\n  }\n\n  makeCondition(classes: string | null, condition: Exprs.Val): Css.Expr {\n    const scope = this.handler.getScope();\n    if (!scope) {\n      return null;\n    }\n    condition = condition || scope._true;\n    if (classes) {\n      const classList = classes.split(/\\s+/);\n      for (const className of classList) {\n        switch (className) {\n          case \"vertical\":\n            condition = Exprs.and(\n              scope,\n              condition,\n              new Exprs.Not(scope, new Exprs.Named(scope, \"pref-horizontal\")),\n            );\n            break;\n          case \"horizontal\":\n            condition = Exprs.and(\n              scope,\n              condition,\n              new Exprs.Named(scope, \"pref-horizontal\"),\n            );\n            break;\n          case \"day\":\n            condition = Exprs.and(\n              scope,\n              condition,\n              new Exprs.Not(scope, new Exprs.Named(scope, \"pref-night-mode\")),\n            );\n            break;\n          case \"night\":\n            condition = Exprs.and(\n              scope,\n              condition,\n              new Exprs.Named(scope, \"pref-night-mode\"),\n            );\n            break;\n          default:\n            condition = scope._false;\n        }\n      }\n    }\n    if (condition === scope._true) {\n      return null;\n    }\n    return new Css.Expr(condition);\n  }\n\n  isInsidePropertyOnlyRule(): boolean {\n    switch (this.ruleStack[this.ruleStack.length - 1]) {\n      case \"[selector]\":\n      case \"font-face\":\n      case \"-epubx-flow\":\n      case \"-epubx-viewport\":\n      case \"-epubx-define\":\n      case \"-adapt-footnote-area\":\n        return true;\n    }\n    return false;\n  }\n\n  runParser(\n    count: number,\n    parsingValue,\n    parsingStyleAttr: boolean,\n    parsingMediaQuery,\n    parsingFunctionParam,\n  ): boolean {\n    const handler = this.handler;\n    const tokenizer = this.tokenizer;\n    const valStack = this.valStack;\n    let token: CssTokenizer.Token;\n    let token1: CssTokenizer.Token;\n    let ns: string | null;\n    let text: string | null;\n    let num: number;\n    let val: Css.Val;\n    let params: (number | string)[];\n    if (parsingMediaQuery) {\n      this.exprContext = ExprContext.MEDIA;\n      this.valStack.push(\"{\");\n    }\n    parserLoop: for (; count > 0; --count) {\n      token = tokenizer.token();\n      switch (this.actions[token.type]) {\n        case Action.IDENT:\n          // figure out if this is a property assignment or selector\n          if (tokenizer.nthToken(1).type != CssTokenizer.TokenType.COLON) {\n            // cannot be property assignment\n            if (this.isInsidePropertyOnlyRule()) {\n              handler.error(\"E_CSS_COLON_EXPECTED\", tokenizer.nthToken(1));\n              this.actions = actionsErrorDecl;\n            } else {\n              this.actions = actionsSelectorStart;\n              handler.startSelectorRule();\n            }\n            continue;\n          }\n          token1 = tokenizer.nthToken(2);\n          if (\n            token1.precededBySpace ||\n            (token1.type != CssTokenizer.TokenType.IDENT &&\n              token1.type != CssTokenizer.TokenType.FUNC)\n          ) {\n            // cannot be a selector\n          } else {\n            // can be either a selector or a property assignment\n            tokenizer.mark();\n          }\n          this.propName = token.text;\n          this.propImportant = false;\n          tokenizer.consume();\n          tokenizer.consume();\n          this.actions = actionsPropVal;\n          valStack.splice(0, valStack.length);\n          continue;\n        case Action.PROP:\n          // figure out if this is a property assignment or selector\n          if (tokenizer.nthToken(1).type != CssTokenizer.TokenType.COLON) {\n            // cannot be property assignment\n            this.actions = actionsErrorDecl;\n            handler.error(\"E_CSS_COLON_EXPECTED\", tokenizer.nthToken(1));\n            continue;\n          }\n          this.propName = token.text;\n          this.propImportant = false;\n          tokenizer.consume();\n          tokenizer.consume();\n          this.actions = actionsPropVal;\n          valStack.splice(0, valStack.length);\n          continue;\n        case Action.SELECTOR_START:\n          // don't consume, process again\n          this.actions = actionsSelectorStart;\n          handler.startSelectorRule();\n          continue;\n        case Action.SELECTOR_NAME_1:\n          if (!token.precededBySpace) {\n            this.actions = actionsErrorSelector;\n            handler.error(\"E_CSS_SPACE_EXPECTED\", token);\n            continue;\n          }\n          handler.descendantSelector();\n\n        // fall through\n        case Action.SELECTOR_NAME:\n          if (tokenizer.nthToken(1).type == CssTokenizer.TokenType.BAR) {\n            tokenizer.consume();\n            tokenizer.consume();\n            ns = this.namespacePrefixToURI[token.text];\n            if (ns != null) {\n              token = tokenizer.token();\n              switch (token.type) {\n                case CssTokenizer.TokenType.IDENT:\n                  handler.tagSelector(ns, token.text);\n                  if (parsingFunctionParam) {\n                    this.actions = actionsSelectorInFunc;\n                  } else {\n                    this.actions = actionsSelector;\n                  }\n                  tokenizer.consume();\n                  break;\n                case CssTokenizer.TokenType.STAR:\n                  handler.tagSelector(ns, null);\n                  if (parsingFunctionParam) {\n                    this.actions = actionsSelectorInFunc;\n                  } else {\n                    this.actions = actionsSelector;\n                  }\n                  tokenizer.consume();\n                  break;\n                default:\n                  this.actions = actionsError;\n                  handler.error(\"E_CSS_NAMESPACE\", token);\n              }\n            } else {\n              this.actions = actionsError;\n              handler.error(\"E_CSS_UNDECLARED_PREFIX\", token);\n            }\n          } else {\n            handler.tagSelector(this.defaultNamespaceURI, token.text);\n            if (parsingFunctionParam) {\n              this.actions = actionsSelectorInFunc;\n            } else {\n              this.actions = actionsSelector;\n            }\n            tokenizer.consume();\n          }\n          continue;\n        case Action.SELECTOR_ANY_1:\n          if (!token.precededBySpace) {\n            this.actions = actionsErrorSelector;\n            handler.error(\"E_CSS_SPACE_EXPECTED\", token);\n            continue;\n          }\n          handler.descendantSelector();\n\n        // fall through\n        case Action.SELECTOR_ANY:\n          if (tokenizer.nthToken(1).type == CssTokenizer.TokenType.BAR) {\n            tokenizer.consume();\n            tokenizer.consume();\n            token = tokenizer.token();\n            switch (token.type) {\n              case CssTokenizer.TokenType.IDENT:\n                handler.tagSelector(null, token.text);\n                if (parsingFunctionParam) {\n                  this.actions = actionsSelectorInFunc;\n                } else {\n                  this.actions = actionsSelector;\n                }\n                tokenizer.consume();\n                break;\n              case CssTokenizer.TokenType.STAR:\n                handler.tagSelector(null, null);\n                if (parsingFunctionParam) {\n                  this.actions = actionsSelectorInFunc;\n                } else {\n                  this.actions = actionsSelector;\n                }\n                tokenizer.consume();\n                break;\n              default:\n                this.actions = actionsError;\n                handler.error(\"E_CSS_NAMESPACE\", token);\n            }\n          } else {\n            handler.tagSelector(this.defaultNamespaceURI, null);\n            if (parsingFunctionParam) {\n              this.actions = actionsSelectorInFunc;\n            } else {\n              this.actions = actionsSelector;\n            }\n            tokenizer.consume();\n          }\n          continue;\n        case Action.SELECTOR_ID_1:\n          if (token.precededBySpace) {\n            handler.descendantSelector();\n          }\n\n        // fall through\n        case Action.SELECTOR_ID:\n          handler.idSelector(token.text);\n          if (parsingFunctionParam) {\n            this.actions = actionsSelectorInFunc;\n          } else {\n            this.actions = actionsSelector;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_CLASS_1:\n          if (token.precededBySpace) {\n            handler.descendantSelector();\n          }\n\n        // fall through\n        case Action.SELECTOR_CLASS:\n          handler.classSelector(token.text);\n          if (parsingFunctionParam) {\n            this.actions = actionsSelectorInFunc;\n          } else {\n            this.actions = actionsSelector;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_PSEUDOCLASS_1:\n          if (token.precededBySpace) {\n            handler.descendantSelector();\n          }\n\n        // fall through\n        case Action.SELECTOR_PSEUDOCLASS:\n          tokenizer.consume();\n          token = tokenizer.token();\n          pseudoclassType: switch (token.type) {\n            case CssTokenizer.TokenType.IDENT:\n              handler.pseudoclassSelector(token.text, null);\n              tokenizer.consume();\n              if (parsingFunctionParam) {\n                this.actions = actionsSelectorInFunc;\n              } else {\n                this.actions = actionsSelector;\n              }\n              continue;\n            case CssTokenizer.TokenType.FUNC:\n              text = token.text;\n              tokenizer.consume();\n              switch (text) {\n                case \"not\":\n                  this.actions = actionsSelectorStart;\n                  handler.startFuncWithSelector(\"not\");\n                  if (\n                    this.runParser(\n                      Number.POSITIVE_INFINITY,\n                      false,\n                      false,\n                      false,\n                      true,\n                    )\n                  ) {\n                    this.actions = actionsSelector;\n                  } else {\n                    this.actions = actionsErrorSelector;\n                  }\n                  break parserLoop;\n                case \"lang\":\n                case \"href-epub-type\":\n                  token = tokenizer.token();\n                  if (token.type === CssTokenizer.TokenType.IDENT) {\n                    params = [token.text];\n                    tokenizer.consume();\n                    break;\n                  } else {\n                    break pseudoclassType;\n                  }\n                case \"nth-child\":\n                case \"nth-of-type\":\n                case \"nth-last-child\":\n                case \"nth-last-of-type\":\n                  params = this.readNthPseudoParams();\n                  if (!params) {\n                    break pseudoclassType;\n                  } else {\n                    break;\n                  }\n                default:\n                  // TODO\n                  params = this.readPseudoParams();\n              }\n              token = tokenizer.token();\n              if (token.type == CssTokenizer.TokenType.C_PAR) {\n                handler.pseudoclassSelector(text as string, params);\n                tokenizer.consume();\n                if (parsingFunctionParam) {\n                  this.actions = actionsSelectorInFunc;\n                } else {\n                  this.actions = actionsSelector;\n                }\n                continue;\n              }\n              break;\n          }\n          handler.error(\"E_CSS_PSEUDOCLASS_SYNTAX\", token);\n          this.actions = actionsError;\n          continue;\n        case Action.SELECTOR_PSEUDOELEM:\n          tokenizer.consume();\n          token = tokenizer.token();\n          switch (token.type) {\n            case CssTokenizer.TokenType.IDENT:\n              handler.pseudoelementSelector(token.text, null);\n              if (parsingFunctionParam) {\n                this.actions = actionsSelectorInFunc;\n              } else {\n                this.actions = actionsSelector;\n              }\n              tokenizer.consume();\n              continue;\n            case CssTokenizer.TokenType.FUNC:\n              text = token.text;\n              tokenizer.consume();\n              if (text == \"nth-fragment\") {\n                params = this.readNthPseudoParams();\n                if (params === null) {\n                  break;\n                }\n              } else {\n                params = this.readPseudoParams();\n              }\n              token = tokenizer.token();\n              if (token.type == CssTokenizer.TokenType.C_PAR) {\n                handler.pseudoelementSelector(text as string, params);\n                if (parsingFunctionParam) {\n                  this.actions = actionsSelectorInFunc;\n                } else {\n                  this.actions = actionsSelector;\n                }\n                tokenizer.consume();\n                continue;\n              }\n              break;\n          }\n          handler.error(\"E_CSS_PSEUDOELEM_SYNTAX\", token);\n          this.actions = actionsError;\n          continue;\n        case Action.SELECTOR_ATTR_1:\n          if (token.precededBySpace) {\n            handler.descendantSelector();\n          }\n\n        // fall through\n        case Action.SELECTOR_ATTR:\n          tokenizer.consume();\n          token = tokenizer.token();\n          if (token.type == CssTokenizer.TokenType.IDENT) {\n            text = token.text;\n            tokenizer.consume();\n          } else if (token.type == CssTokenizer.TokenType.STAR) {\n            text = null;\n            tokenizer.consume();\n          } else if (token.type == CssTokenizer.TokenType.BAR) {\n            text = \"\";\n          } else {\n            this.actions = actionsErrorSelector;\n            handler.error(\"E_CSS_ATTR\", token);\n            tokenizer.consume();\n            continue;\n          }\n          token = tokenizer.token();\n          if (token.type == CssTokenizer.TokenType.BAR) {\n            ns = text ? this.namespacePrefixToURI[text] : text;\n            if (ns == null) {\n              this.actions = actionsErrorSelector;\n              handler.error(\"E_CSS_UNDECLARED_PREFIX\", token);\n              tokenizer.consume();\n              continue;\n            }\n            tokenizer.consume();\n            token = tokenizer.token();\n            if (token.type != CssTokenizer.TokenType.IDENT) {\n              this.actions = actionsErrorSelector;\n              handler.error(\"E_CSS_ATTR_NAME_EXPECTED\", token);\n              continue;\n            }\n            text = token.text;\n            tokenizer.consume();\n            token = tokenizer.token();\n          } else {\n            ns = \"\";\n          }\n          switch (token.type) {\n            case CssTokenizer.TokenType.EQ:\n            case CssTokenizer.TokenType.TILDE_EQ:\n            case CssTokenizer.TokenType.BAR_EQ:\n            case CssTokenizer.TokenType.HAT_EQ:\n            case CssTokenizer.TokenType.DOLLAR_EQ:\n            case CssTokenizer.TokenType.STAR_EQ:\n            case CssTokenizer.TokenType.COL_COL:\n              num = token.type;\n              tokenizer.consume();\n              token = tokenizer.token();\n              break;\n            case CssTokenizer.TokenType.C_BRK:\n              handler.attributeSelector(\n                ns as string,\n                text as string,\n                CssTokenizer.TokenType.EOF,\n                null,\n              );\n              if (parsingFunctionParam) {\n                this.actions = actionsSelectorInFunc;\n              } else {\n                this.actions = actionsSelector;\n              }\n              tokenizer.consume();\n              continue;\n            default:\n              this.actions = actionsErrorSelector;\n              handler.error(\"E_CSS_ATTR_OP_EXPECTED\", token);\n              continue;\n          }\n          switch (token.type) {\n            case CssTokenizer.TokenType.IDENT:\n            case CssTokenizer.TokenType.STR:\n              handler.attributeSelector(\n                ns as string,\n                text as string,\n                num,\n                token.text,\n              );\n              tokenizer.consume();\n              token = tokenizer.token();\n              break;\n            default:\n              this.actions = actionsErrorSelector;\n              handler.error(\"E_CSS_ATTR_VAL_EXPECTED\", token);\n              continue;\n          }\n          if (token.type != CssTokenizer.TokenType.C_BRK) {\n            this.actions = actionsErrorSelector;\n            handler.error(\"E_CSS_ATTR\", token);\n            continue;\n          }\n          if (parsingFunctionParam) {\n            this.actions = actionsSelectorInFunc;\n          } else {\n            this.actions = actionsSelector;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_CHILD:\n          handler.childSelector();\n          this.actions = actionsSelectorCont;\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_SIBLING:\n          handler.adjacentSiblingSelector();\n          this.actions = actionsSelectorCont;\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_FOLLOWING_SIBLING:\n          handler.followingSiblingSelector();\n          this.actions = actionsSelectorCont;\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_BODY:\n          if (this.regionRule) {\n            this.ruleStack.push(\"-epubx-region\");\n            this.regionRule = false;\n          } else if (this.pageRule) {\n            this.ruleStack.push(\"page\");\n            this.pageRule = false;\n          } else {\n            this.ruleStack.push(\"[selector]\");\n          }\n          handler.startRuleBody();\n          this.actions = actionsBase;\n          tokenizer.consume();\n          continue;\n        case Action.SELECTOR_NEXT:\n          handler.nextSelector();\n          this.actions = actionsSelectorStart;\n          tokenizer.consume();\n          continue;\n        case Action.VAL_IDENT:\n          valStack.push(Css.getName(token.text));\n          tokenizer.consume();\n          continue;\n        case Action.VAL_HASH:\n          num = parseInt(token.text, 16);\n          try {\n            valStack.push(colorFromHash(token.text));\n          } catch (err) {\n            handler.error(\"E_CSS_COLOR\", token);\n            this.actions = actionsError;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.VAL_NUM:\n          valStack.push(new Css.Num(token.num));\n          tokenizer.consume();\n          continue;\n        case Action.VAL_INT:\n          valStack.push(new Css.Int(token.num));\n          tokenizer.consume();\n          continue;\n        case Action.VAL_NUMERIC:\n          if (Exprs.isViewportRelativeLengthUnit(token.text)) {\n            // Treat numeric value with viewport unit as numeric in expr.\n            valStack.push(\n              new Css.Expr(\n                new Exprs.Numeric(handler.getScope(), token.num, token.text),\n              ),\n            );\n          } else {\n            valStack.push(new Css.Numeric(token.num, token.text));\n          }\n          tokenizer.consume();\n          continue;\n        case Action.VAL_STR:\n          valStack.push(new Css.Str(token.text));\n          tokenizer.consume();\n          continue;\n        case Action.VAL_URL:\n          valStack.push(new Css.URL(Base.resolveURL(token.text, this.baseURL)));\n          tokenizer.consume();\n          continue;\n        case Action.VAL_COMMA:\n          this.valStackReduce(\",\", token);\n          valStack.push(\",\");\n          tokenizer.consume();\n          continue;\n        case Action.VAL_SLASH:\n          valStack.push(Css.slash);\n          tokenizer.consume();\n          continue;\n        case Action.VAL_FUNC:\n          text = token.text.toLowerCase();\n          if (text == \"-epubx-expr\" || text == \"calc\" || text == \"env\") {\n            // special case\n            this.actions = actionsExprVal;\n            this.exprContext = ExprContext.PROP;\n            valStack.push(\"{\");\n          } else {\n            valStack.push(text);\n            valStack.push(\"(\");\n          }\n          tokenizer.consume();\n          continue;\n        case Action.VAL_C_PAR:\n          this.valStackReduce(\")\", token);\n          tokenizer.consume();\n          continue;\n        case Action.VAL_BANG:\n          tokenizer.consume();\n          token = tokenizer.token();\n          token1 = tokenizer.nthToken(1);\n          if (\n            token.type == CssTokenizer.TokenType.IDENT &&\n            token.text.toLowerCase() == \"important\" &&\n            (token1.type == CssTokenizer.TokenType.SEMICOL ||\n              token1.type == CssTokenizer.TokenType.EOF ||\n              token1.type == CssTokenizer.TokenType.C_BRC)\n          ) {\n            tokenizer.consume();\n            this.propImportant = true;\n            continue;\n          }\n          this.exprError(\"E_CSS_SYNTAX\", token);\n          continue;\n        case Action.VAL_PLUS:\n          token1 = tokenizer.nthToken(1);\n          switch (token1.type) {\n            case CssTokenizer.TokenType.NUM:\n            case CssTokenizer.TokenType.NUMERIC:\n            case CssTokenizer.TokenType.INT:\n              if (!token1.precededBySpace) {\n                // Plus before number, ignore\n                tokenizer.consume();\n                continue;\n              }\n          }\n          if (this.actions === actionsPropVal && tokenizer.hasMark()) {\n            tokenizer.reset();\n            this.actions = actionsSelectorStart;\n            handler.startSelectorRule();\n            continue;\n          } else {\n            this.exprError(\"E_CSS_UNEXPECTED_PLUS\", token);\n            continue;\n          }\n        case Action.VAL_END:\n          tokenizer.consume();\n\n        // fall through\n        case Action.VAL_BRC:\n          tokenizer.unmark();\n          val = this.valStackReduce(\";\", token);\n          if (val && this.propName) {\n            handler.property(this.propName as string, val, this.propImportant);\n          }\n          this.actions = parsingStyleAttr ? actionsStyleAttribute : actionsBase;\n          continue;\n        case Action.VAL_FINISH:\n          tokenizer.consume();\n          tokenizer.unmark();\n          val = this.valStackReduce(\";\", token);\n          if (parsingValue) {\n            this.result = val;\n            return true;\n          }\n          if (this.propName && val) {\n            handler.property(this.propName as string, val, this.propImportant);\n          }\n          if (parsingStyleAttr) {\n            return true;\n          }\n          this.exprError(\"E_CSS_SYNTAX\", token);\n          continue;\n        case Action.EXPR_IDENT:\n          token1 = tokenizer.nthToken(1);\n          if (token1.type == CssTokenizer.TokenType.CLASS) {\n            if (\n              tokenizer.nthToken(2).type == CssTokenizer.TokenType.O_PAR &&\n              !tokenizer.nthToken(2).precededBySpace\n            ) {\n              valStack.push(token.text, token1.text, \"(\");\n              tokenizer.consume();\n            } else {\n              valStack.push(\n                new Exprs.Named(\n                  handler.getScope(),\n                  Exprs.makeQualifiedName(token.text, token1.text),\n                ),\n              );\n              this.actions = actionsExprOp;\n            }\n            tokenizer.consume();\n          } else {\n            if (\n              this.exprContext == ExprContext.MEDIA ||\n              this.exprContext == ExprContext.IMPORT\n            ) {\n              if (token.text.toLowerCase() == \"not\") {\n                tokenizer.consume();\n                valStack.push(\n                  new Exprs.MediaName(handler.getScope(), true, token1.text),\n                );\n              } else {\n                if (token.text.toLowerCase() == \"only\") {\n                  tokenizer.consume();\n                  token = token1;\n                }\n                valStack.push(\n                  new Exprs.MediaName(handler.getScope(), false, token.text),\n                );\n              }\n            } else {\n              valStack.push(new Exprs.Named(handler.getScope(), token.text));\n            }\n            this.actions = actionsExprOp;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_FUNC:\n          valStack.push(null, token.text, \"(\");\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_NUM:\n          valStack.push(new Exprs.Const(handler.getScope(), token.num));\n          tokenizer.consume();\n          this.actions = actionsExprOp;\n          continue;\n        case Action.EXPR_NUMERIC:\n          text = token.text;\n          if (text == \"%\") {\n            if (this.propName && this.propName.match(/height|^(top|bottom)$/)) {\n              text = \"vh\";\n            } else {\n              text = \"vw\";\n            }\n          }\n          valStack.push(new Exprs.Numeric(handler.getScope(), token.num, text));\n          tokenizer.consume();\n          this.actions = actionsExprOp;\n          continue;\n        case Action.EXPR_STR:\n          valStack.push(new Exprs.Const(handler.getScope(), token.text));\n          tokenizer.consume();\n          this.actions = actionsExprOp;\n          continue;\n        case Action.EXPR_PARAM:\n          tokenizer.consume();\n          token = tokenizer.token();\n          if (\n            token.type != CssTokenizer.TokenType.INT ||\n            token.precededBySpace\n          ) {\n            this.exprError(\"E_CSS_SYNTAX\", token);\n          } else {\n            valStack.push(new Exprs.Param(handler.getScope(), token.num));\n            tokenizer.consume();\n            this.actions = actionsExprOp;\n          }\n          continue;\n        case Action.EXPR_PREFIX:\n          valStack.push(-token.type);\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_INFIX:\n          this.actions = actionsExprVal;\n          this.exprStackReduce(token.type, token);\n          valStack.push(token.type);\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_INFIX_NAME:\n          if (token.text.toLowerCase() == \"and\") {\n            this.actions = actionsExprVal;\n            this.exprStackReduce(OP_MEDIA_AND, token);\n            valStack.push(OP_MEDIA_AND);\n            tokenizer.consume();\n          } else {\n            this.exprError(\"E_CSS_SYNTAX\", token);\n          }\n          continue;\n        case Action.EXPR_C_PAR:\n          if (this.exprStackReduce(token.type, token)) {\n            if (this.propName) {\n              this.actions = actionsPropVal;\n            } else {\n              this.exprError(\"E_CSS_UNBALANCED_PAR\", token);\n            }\n          }\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_O_BRC:\n          if (this.exprStackReduce(CssTokenizer.TokenType.C_PAR, token)) {\n            if (this.propName || this.exprContext == ExprContext.IMPORT) {\n              this.exprError(\"E_CSS_UNEXPECTED_BRC\", token);\n            } else {\n              if (this.exprContext == ExprContext.WHEN) {\n                handler.startWhenRule(valStack.pop() as Css.Expr);\n              } else {\n                handler.startMediaRule(valStack.pop() as Css.Expr);\n              }\n              this.ruleStack.push(\"media\");\n              handler.startRuleBody();\n              this.actions = actionsBase;\n            }\n          }\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_SEMICOL:\n          if (this.exprStackReduce(CssTokenizer.TokenType.C_PAR, token)) {\n            if (this.propName || this.exprContext != ExprContext.IMPORT) {\n              this.exprError(\"E_CSS_UNEXPECTED_SEMICOL\", token);\n            } else {\n              this.importCondition = valStack.pop() as Css.Expr;\n              this.importReady = true;\n              this.actions = actionsBase;\n              tokenizer.consume();\n              return false;\n            }\n          }\n          tokenizer.consume();\n          continue;\n        case Action.EXPR_O_PAR:\n          valStack.push(token.type);\n          tokenizer.consume();\n          continue;\n        case Action.RULE_END:\n          this.actions = actionsBase;\n          tokenizer.consume();\n          handler.endRule();\n          if (this.ruleStack.length) {\n            this.ruleStack.pop();\n          }\n          continue;\n        case Action.AT:\n          text = token.text.toLowerCase();\n          switch (text) {\n            case \"import\":\n              tokenizer.consume();\n              token = tokenizer.token();\n              if (\n                token.type == CssTokenizer.TokenType.STR ||\n                token.type == CssTokenizer.TokenType.URL\n              ) {\n                this.importURL = token.text;\n                tokenizer.consume();\n                token = tokenizer.token();\n                if (\n                  token.type == CssTokenizer.TokenType.SEMICOL ||\n                  token.type == CssTokenizer.TokenType.EOF\n                ) {\n                  this.importReady = true;\n                  tokenizer.consume();\n                  return false;\n                } else {\n                  this.propName = null; // signals @ rule\n                  this.exprContext = ExprContext.IMPORT;\n                  this.actions = actionsExprVal;\n                  valStack.push(\"{\");\n                  continue;\n                }\n              }\n              handler.error(\"E_CSS_IMPORT_SYNTAX\", token);\n              this.actions = actionsError;\n              continue;\n            case \"namespace\":\n              tokenizer.consume();\n              token = tokenizer.token();\n              switch (token.type) {\n                case CssTokenizer.TokenType.IDENT:\n                  text = token.text; // Prefix\n                  tokenizer.consume();\n                  token = tokenizer.token();\n                  if (\n                    (token.type == CssTokenizer.TokenType.STR ||\n                      token.type == CssTokenizer.TokenType.URL) &&\n                    tokenizer.nthToken(1).type == CssTokenizer.TokenType.SEMICOL\n                  ) {\n                    this.namespacePrefixToURI[text] = token.text;\n                    tokenizer.consume();\n                    tokenizer.consume();\n                    continue;\n                  }\n                  break;\n                case CssTokenizer.TokenType.STR:\n                case CssTokenizer.TokenType.URL:\n                  if (\n                    tokenizer.nthToken(1).type == CssTokenizer.TokenType.SEMICOL\n                  ) {\n                    this.defaultNamespaceURI = token.text;\n                    tokenizer.consume();\n                    tokenizer.consume();\n                    continue;\n                  }\n                  break;\n              }\n              handler.error(\"E_CSS_NAMESPACE_SYNTAX\", token);\n              this.actions = actionsError;\n              continue;\n            case \"charset\":\n              // Useless in EPUB (only UTF-8 or UTF-16 is allowed anyway and\n              // we are at the mercy of the browser charset handling anyway).\n              tokenizer.consume();\n              token = tokenizer.token();\n              if (\n                token.type == CssTokenizer.TokenType.STR &&\n                tokenizer.nthToken(1).type == CssTokenizer.TokenType.SEMICOL\n              ) {\n                text = token.text.toLowerCase();\n                if (text != \"utf-8\" && text != \"utf-16\") {\n                  handler.error(`E_CSS_UNEXPECTED_CHARSET ${text}`, token);\n                }\n                tokenizer.consume();\n                tokenizer.consume();\n                continue;\n              }\n              handler.error(\"E_CSS_CHARSET_SYNTAX\", token);\n              this.actions = actionsError;\n              continue;\n            case \"font-face\":\n            case \"-epubx-page-template\":\n            case \"-epubx-define\":\n            case \"-epubx-viewport\":\n              if (tokenizer.nthToken(1).type == CssTokenizer.TokenType.O_BRC) {\n                tokenizer.consume();\n                tokenizer.consume();\n                switch (text) {\n                  case \"font-face\":\n                    handler.startFontFaceRule();\n                    break;\n                  case \"-epubx-page-template\":\n                    handler.startPageTemplateRule();\n                    break;\n                  case \"-epubx-define\":\n                    handler.startDefineRule();\n                    break;\n                  case \"-epubx-viewport\":\n                    handler.startViewportRule();\n                    break;\n                }\n                this.ruleStack.push(text);\n                handler.startRuleBody();\n                continue;\n              }\n              break;\n            case \"-adapt-footnote-area\":\n              tokenizer.consume();\n              token = tokenizer.token();\n              switch (token.type) {\n                case CssTokenizer.TokenType.O_BRC:\n                  tokenizer.consume();\n                  handler.startFootnoteRule(null);\n                  this.ruleStack.push(text);\n                  handler.startRuleBody();\n                  continue;\n                case CssTokenizer.TokenType.COL_COL:\n                  tokenizer.consume();\n                  token = tokenizer.token();\n                  if (\n                    token.type == CssTokenizer.TokenType.IDENT &&\n                    tokenizer.nthToken(1).type == CssTokenizer.TokenType.O_BRC\n                  ) {\n                    text = token.text;\n                    tokenizer.consume();\n                    tokenizer.consume();\n                    handler.startFootnoteRule(text);\n                    this.ruleStack.push(\"-adapt-footnote-area\");\n                    handler.startRuleBody();\n                    continue;\n                  }\n                  break;\n              }\n              break;\n            case \"-epubx-region\":\n              tokenizer.consume();\n              handler.startRegionRule();\n              this.regionRule = true;\n              this.actions = actionsSelectorStart;\n              continue;\n            case \"page\":\n              tokenizer.consume();\n              handler.startPageRule();\n              this.pageRule = true;\n              this.actions = actionsSelectorCont;\n              continue;\n            case \"top-left-corner\":\n            case \"top-left\":\n            case \"top-center\":\n            case \"top-right\":\n            case \"top-right-corner\":\n            case \"right-top\":\n            case \"right-middle\":\n            case \"right-bottom\":\n            case \"bottom-right-corner\":\n            case \"bottom-right\":\n            case \"bottom-center\":\n            case \"bottom-left\":\n            case \"bottom-left-corner\":\n            case \"left-bottom\":\n            case \"left-middle\":\n            case \"left-top\":\n              tokenizer.consume();\n              token = tokenizer.token();\n              if (token.type == CssTokenizer.TokenType.O_BRC) {\n                tokenizer.consume();\n                handler.startPageMarginBoxRule(text);\n                this.ruleStack.push(text);\n                handler.startRuleBody();\n                continue;\n              }\n              break;\n            case \"-epubx-when\":\n              tokenizer.consume();\n              this.propName = null; // signals @ rule\n              this.exprContext = ExprContext.WHEN;\n              this.actions = actionsExprVal;\n              valStack.push(\"{\");\n              continue;\n            case \"media\":\n              tokenizer.consume();\n              this.propName = null; // signals @ rule\n              this.exprContext = ExprContext.MEDIA;\n              this.actions = actionsExprVal;\n              valStack.push(\"{\");\n              continue;\n            case \"-epubx-flow\":\n              if (\n                tokenizer.nthToken(1).type == CssTokenizer.TokenType.IDENT &&\n                tokenizer.nthToken(2).type == CssTokenizer.TokenType.O_BRC\n              ) {\n                handler.startFlowRule(tokenizer.nthToken(1).text);\n                tokenizer.consume();\n                tokenizer.consume();\n                tokenizer.consume();\n                this.ruleStack.push(text);\n                handler.startRuleBody();\n                continue;\n              }\n              break;\n            case \"-epubx-page-master\":\n            case \"-epubx-partition\":\n            case \"-epubx-partition-group\": {\n              tokenizer.consume();\n              token = tokenizer.token();\n              let ruleName: string | null = null;\n              let rulePseudoName: string | null = null;\n              const classes: string[] = [];\n              if (token.type == CssTokenizer.TokenType.IDENT) {\n                ruleName = token.text;\n                tokenizer.consume();\n                token = tokenizer.token();\n              }\n              if (\n                token.type == CssTokenizer.TokenType.COLON &&\n                tokenizer.nthToken(1).type == CssTokenizer.TokenType.IDENT\n              ) {\n                rulePseudoName = tokenizer.nthToken(1).text;\n                tokenizer.consume();\n                tokenizer.consume();\n                token = tokenizer.token();\n              }\n              while (\n                token.type == CssTokenizer.TokenType.FUNC &&\n                token.text.toLowerCase() == \"class\" &&\n                tokenizer.nthToken(1).type == CssTokenizer.TokenType.IDENT &&\n                tokenizer.nthToken(2).type == CssTokenizer.TokenType.C_PAR\n              ) {\n                classes.push(tokenizer.nthToken(1).text);\n                tokenizer.consume();\n                tokenizer.consume();\n                tokenizer.consume();\n                token = tokenizer.token();\n              }\n              if (token.type == CssTokenizer.TokenType.O_BRC) {\n                tokenizer.consume();\n                switch (text) {\n                  case \"-epubx-page-master\":\n                    handler.startPageMasterRule(\n                      ruleName,\n                      rulePseudoName,\n                      classes,\n                    );\n                    break;\n                  case \"-epubx-partition\":\n                    handler.startPartitionRule(\n                      ruleName,\n                      rulePseudoName,\n                      classes,\n                    );\n                    break;\n                  case \"-epubx-partition-group\":\n                    handler.startPartitionGroupRule(\n                      ruleName,\n                      rulePseudoName,\n                      classes,\n                    );\n                    break;\n                }\n                this.ruleStack.push(text);\n                handler.startRuleBody();\n                continue;\n              }\n              break;\n            }\n            case \"\":\n              // No text after @\n              handler.error(`E_CSS_UNEXPECTED_AT${text}`, token);\n\n              // Error recovery using selector rules.\n              this.actions = actionsErrorSelector;\n              continue;\n            default:\n              handler.error(`E_CSS_AT_UNKNOWN ${text}`, token);\n              this.actions = actionsError;\n              continue;\n          }\n          handler.error(`E_CSS_AT_SYNTAX ${text}`, token);\n          this.actions = actionsError;\n          continue;\n        case Action.ERROR_PUSH:\n          // Open bracket while skipping error syntax\n          if (parsingValue || parsingStyleAttr) {\n            return true;\n          }\n          this.errorBrackets.push(token.type + 1);\n\n          // Expected closing bracket\n          tokenizer.consume();\n          continue;\n        case Action.ERROR_POP_DECL:\n          // Close bracket while skipping error syntax in declaration\n          if (parsingValue || parsingStyleAttr) {\n            return true;\n          }\n          if (this.errorBrackets.length == 0) {\n            this.actions = actionsBase;\n\n            // Don't consume closing brace\n            continue;\n          }\n\n        // fall through\n        case Action.ERROR_POP:\n          // Close bracket while skipping error syntax\n          if (\n            this.errorBrackets.length > 0 &&\n            this.errorBrackets[this.errorBrackets.length - 1] == token.type\n          ) {\n            this.errorBrackets.pop();\n          }\n          if (\n            this.errorBrackets.length == 0 &&\n            token.type == CssTokenizer.TokenType.C_BRC\n          ) {\n            this.actions = actionsBase;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.ERROR_SEMICOL:\n          if (parsingValue || parsingStyleAttr) {\n            return true;\n          }\n          if (this.errorBrackets.length == 0) {\n            this.actions = actionsBase;\n          }\n          tokenizer.consume();\n          continue;\n        case Action.DONE:\n          if (parsingFunctionParam) {\n            tokenizer.consume();\n            handler.endFuncWithSelector();\n          }\n          return true;\n        default:\n          if (parsingValue || parsingStyleAttr) {\n            return true;\n          }\n          if (parsingMediaQuery) {\n            if (this.exprStackReduce(CssTokenizer.TokenType.C_PAR, token)) {\n              this.result = valStack.pop() as Css.Val;\n              return true;\n            }\n            return false;\n          }\n          if (parsingFunctionParam) {\n            if (token.type == CssTokenizer.TokenType.INVALID) {\n              handler.error(token.text, token);\n            } else {\n              handler.error(\"E_CSS_SYNTAX\", token);\n            }\n            return false;\n          }\n          if (this.actions === actionsPropVal && tokenizer.hasMark()) {\n            tokenizer.reset();\n            this.actions = actionsSelectorStart;\n            handler.startSelectorRule();\n            continue;\n          }\n          if (\n            this.actions !== actionsError &&\n            this.actions !== actionsErrorSelector &&\n            this.actions !== actionsErrorDecl\n          ) {\n            if (token.type == CssTokenizer.TokenType.INVALID) {\n              handler.error(token.text, token);\n            } else {\n              handler.error(\"E_CSS_SYNTAX\", token);\n            }\n            if (this.isInsidePropertyOnlyRule()) {\n              this.actions = actionsErrorDecl;\n            } else {\n              this.actions = actionsErrorSelector;\n            }\n            continue; // Let error-recovery to re-process the offending token\n          }\n          tokenizer.consume();\n          continue;\n      }\n    }\n    return false; // Not done yet.\n  }\n}\n\nexport class ErrorHandler extends ParserHandler {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super(null);\n  }\n\n  /**\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    throw new Error(mnemonics);\n  }\n\n  /**\n   * @override\n   */\n  getScope(): Exprs.LexicalScope {\n    return this.scope;\n  }\n}\n\nexport function parseStylesheet(\n  tokenizer: CssTokenizer.Tokenizer,\n  handler: ParserHandler,\n  baseURL: string,\n  classes: string | null,\n  media: string | null,\n): Task.Result<boolean> {\n  const frame: Task.Frame<boolean> = Task.newFrame(\"parseStylesheet\");\n  const parser = new Parser(actionsBase, tokenizer, handler, baseURL);\n  let condition: Css.Expr = null;\n  if (media) {\n    condition = parseMediaQuery(\n      new CssTokenizer.Tokenizer(media, handler),\n      handler,\n      baseURL,\n    );\n  }\n  condition = parser.makeCondition(classes, condition && condition.toExpr());\n  if (condition) {\n    handler.startMediaRule(condition);\n    handler.startRuleBody();\n  }\n  frame\n    .loop(() => {\n      while (!parser.runParser(100, false, false, false, false)) {\n        if (parser.importReady) {\n          const resolvedURL = Base.resolveURL(\n            parser.importURL as string,\n            baseURL,\n          );\n          if (parser.importCondition) {\n            handler.startMediaRule(parser.importCondition);\n            handler.startRuleBody();\n          }\n          const innerFrame: Task.Frame<boolean> = Task.newFrame(\n            \"parseStylesheet.import\",\n          );\n          parseStylesheetFromURL(resolvedURL, handler, null, null).then(() => {\n            if (parser.importCondition) {\n              handler.endRule();\n            }\n            parser.importReady = false;\n            parser.importURL = null;\n            parser.importCondition = null;\n            innerFrame.finish(true);\n          });\n          return innerFrame.result();\n        }\n        const r = frame.timeSlice();\n        if (r.isPending) {\n          return r;\n        }\n      }\n      return Task.newResult(false);\n    })\n    .then(() => {\n      if (condition) {\n        handler.endRule();\n      }\n      frame.finish(true);\n    });\n  return frame.result();\n}\n\nexport function parseStylesheetFromText(\n  text: string,\n  handler: ParserHandler,\n  baseURL: string,\n  classes: string | null,\n  media: string | null,\n): Task.Result<boolean> {\n  return Task.handle(\n    \"parseStylesheetFromText\",\n    (frame) => {\n      const tok = new CssTokenizer.Tokenizer(text, handler);\n      parseStylesheet(tok, handler, baseURL, classes, media).thenFinish(frame);\n    },\n    (frame, err) => {\n      Logging.logger.warn(err, `Failed to parse stylesheet text: ${text}`);\n      frame.finish(false);\n    },\n  );\n}\n\nexport function parseStylesheetFromURL(\n  url: string,\n  handler: ParserHandler,\n  classes: string | null,\n  media: string | null,\n): Task.Result<boolean> {\n  return Task.handle(\n    \"parseStylesheetFromURL\",\n    (frame) => {\n      Net.ajax(url).then((xhr) => {\n        if (!xhr.responseText) {\n          frame.finish(true);\n        } else {\n          parseStylesheetFromText(\n            xhr.responseText,\n            handler,\n            url,\n            classes,\n            media,\n          ).then((result) => {\n            if (!result) {\n              Logging.logger.warn(`Failed to parse stylesheet from ${url}`);\n            }\n            frame.finish(true);\n          });\n        }\n      });\n    },\n    (frame, err) => {\n      Logging.logger.warn(err, \"Exception while fetching and parsing:\", url);\n      frame.finish(true);\n    },\n  );\n}\n\nexport function parseValue(\n  scope: Exprs.LexicalScope,\n  tokenizer: CssTokenizer.Tokenizer,\n  baseURL: string,\n): Css.Val {\n  const parser = new Parser(\n    actionsPropVal,\n    tokenizer,\n    new ErrorHandler(scope),\n    baseURL,\n  );\n  parser.runParser(Number.POSITIVE_INFINITY, true, false, false, false);\n  return parser.result;\n}\n\nexport function parseStyleAttribute(\n  tokenizer: CssTokenizer.Tokenizer,\n  handler: ParserHandler,\n  baseURL: string,\n): void {\n  const parser = new Parser(actionsStyleAttribute, tokenizer, handler, baseURL);\n  parser.runParser(Number.POSITIVE_INFINITY, false, true, false, false);\n}\n\nexport function parseMediaQuery(\n  tokenizer: CssTokenizer.Tokenizer,\n  handler: ParserHandler,\n  baseURL: string,\n): Css.Expr {\n  const parser = new Parser(actionsExprVal, tokenizer, handler, baseURL);\n  parser.runParser(Number.POSITIVE_INFINITY, false, false, true, false);\n  return parser.result as Css.Expr;\n}\n\nexport const numProp: { [key: string]: boolean } = {\n  \"z-index\": true,\n  \"column-count\": true,\n  \"flow-linger\": true,\n  opacity: true,\n  page: true,\n  \"flow-priority\": true,\n  utilization: true,\n};\n\nexport function takesOnlyNum(propName: string): boolean {\n  return !!numProp[propName];\n}\n\n/**\n * @return val\n */\nexport function evaluateExprToCSS(\n  context: Exprs.Context,\n  val: Exprs.Val,\n  propName: string,\n): Css.Val {\n  const result = val.evaluate(context);\n  switch (typeof result) {\n    case \"number\":\n      if (!takesOnlyNum(propName)) {\n        return new Css.Numeric(result as number, \"px\");\n      } else if (result == Math.round(result as number)) {\n        return new Css.Int(result as number);\n      } else {\n        return new Css.Num(result as number);\n      }\n    case \"string\":\n      if (!result) {\n        return Css.empty;\n      }\n\n      // TODO: where baseURL should come from???\n      return parseValue(\n        val.scope,\n        new CssTokenizer.Tokenizer(result as string, null),\n        \"\",\n      );\n    case \"boolean\":\n      return result ? Css.ident._true : Css.ident._false;\n    case \"undefined\":\n      return Css.empty;\n  }\n  throw new Error(\"E_UNEXPECTED\");\n}\n\n/**\n * @return val\n */\nexport function evaluateCSSToCSS(\n  context: Exprs.Context,\n  val: Css.Val,\n  propName: string,\n): Css.Val {\n  if (val.isExpr()) {\n    return evaluateExprToCSS(context, (val as Css.Expr).expr, propName);\n  }\n  return val;\n}\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Matchers - Definitions of Matcher.\n */\nimport * as Asserts from \"./asserts\";\n\n/**\n * Checkes whether given order can be represented as an+b with a non-negative\n * interger n\n */\nexport function matchANPlusB(order: number, a: number, b: number): boolean {\n  order -= b;\n  if (a === 0) {\n    return order === 0;\n  } else {\n    return order % a === 0 && order / a >= 0;\n  }\n}\n\nexport interface Matcher {\n  matches(): boolean;\n}\n\nexport class AnyMatcher implements Matcher {\n  constructor(public readonly matchers: Matcher[]) {}\n\n  /** @override */\n  matches(): boolean {\n    return this.matchers.some((matcher) => matcher.matches());\n  }\n}\n\nexport class AllMatcher implements Matcher {\n  constructor(public readonly matchers: Matcher[]) {}\n\n  /** @override */\n  matches(): boolean {\n    return this.matchers.every((matcher) => matcher.matches());\n  }\n}\n\nexport class NthFragmentMatcher implements Matcher {\n  static fragmentIndices = {};\n\n  static registerFragmentIndex(\n    elementOffset: number,\n    fragmentIndex: number,\n    priority: number,\n  ) {\n    const indices = NthFragmentMatcher.fragmentIndices;\n    if (\n      !indices[elementOffset] ||\n      indices[elementOffset].priority <= priority\n    ) {\n      indices[elementOffset] = { fragmentIndex, priority };\n    }\n  }\n\n  static clearFragmentIndices() {\n    NthFragmentMatcher.fragmentIndices = {};\n  }\n\n  constructor(\n    public readonly elementOffset: number,\n    public readonly a: number,\n    public readonly b: number,\n  ) {}\n\n  /** @override */\n  matches(): boolean {\n    const entry = NthFragmentMatcher.fragmentIndices[this.elementOffset];\n    return (\n      entry != null &&\n      entry.fragmentIndex != null &&\n      matchANPlusB(entry.fragmentIndex, this.a, this.b)\n    );\n  }\n}\n\nexport class MatcherBuilder {\n  static buildViewConditionMatcher(\n    elementOffset: number,\n    viewCondition: string,\n  ): Matcher {\n    const strs = viewCondition.split(\"_\");\n    if (strs[0] == \"NFS\") {\n      return new NthFragmentMatcher(\n        elementOffset,\n        parseInt(strs[1], 10),\n        parseInt(strs[2], 10),\n      );\n    } else {\n      Asserts.fail(`unknown view condition. condition=${viewCondition}`);\n      return null;\n    }\n  }\n\n  static buildAllMatcher(matchers: Matcher[]): Matcher {\n    return new AllMatcher(matchers);\n  }\n\n  static buildAnyMatcher(matchers: Matcher[]): Matcher {\n    return new AnyMatcher(matchers);\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssCascade - CSS Cascade.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as CssValidator from \"./css-validator\";\nimport * as Exprs from \"./exprs\";\nimport * as Logging from \"./logging\";\nimport * as Matchers from \"./matchers\";\nimport * as Plugin from \"./plugin\";\nimport * as Vtree from \"./vtree\";\nimport { CssCascade } from \"./types\";\n\nexport interface ElementStyle extends CssCascade.ElementStyle {}\n\nexport const inheritedProps = {\n  azimuth: true,\n  \"border-collapse\": true,\n  \"border-spacing\": true,\n  \"caption-side\": true,\n  \"clip-rule\": true,\n  color: true,\n  \"color-interpolation\": true,\n  \"color-rendering\": true,\n  cursor: true,\n  direction: true,\n  elevation: true,\n  \"empty-cells\": true,\n  fill: true,\n  \"fill-opacity\": true,\n  \"fill-rule\": true,\n  \"font-kerning\": true,\n  \"font-size\": true,\n  \"font-size-adjust\": true,\n  \"font-family\": true,\n  \"font-feature-settings\": true,\n  \"font-style\": true,\n  \"font-stretch\": true,\n  \"font-variant\": true,\n  \"font-weight\": true,\n  \"glyph-orientation-vertical\": true,\n  hyphens: true,\n  \"hyphenate-character\": true,\n  \"hyphenate-limit-chars\": true,\n  \"hyphenate-limit-last\": true,\n  \"image-rendering\": true,\n  \"image-resolution\": true,\n  \"letter-spacing\": true,\n  \"line-break\": true,\n  \"line-height\": true,\n  \"list-style-image\": true,\n  \"list-style-position\": true,\n  \"list-style-type\": true,\n  marker: true,\n  \"marker-end\": true,\n  \"marker-mid\": true,\n  \"marker-start\": true,\n  orphans: true,\n  \"overflow-wrap\": true,\n  \"paint-order\": true,\n  \"pointer-events\": true,\n  \"pitch-range\": true,\n  quotes: true,\n  richness: true,\n  \"ruby-align\": true,\n  \"ruby-position\": true,\n  \"speak-header\": true,\n  \"speak-numeral\": true,\n  \"speak-punctuation\": true,\n  \"speech-rate\": true,\n  \"shape-rendering\": true,\n  stress: true,\n  stroke: true,\n  \"stroke-dasharray\": true,\n  \"stroke-dashoffset\": true,\n  \"stroke-linecap\": true,\n  \"stroke-linejoin\": true,\n  \"stroke-miterlimit\": true,\n  \"stroke-opacity\": true,\n  \"stroke-width\": true,\n  \"tab-size\": true,\n  \"text-align\": true,\n  \"text-align-last\": true,\n  \"text-anchor\": true,\n  \"text-decoration-skip\": true,\n  \"text-emphasis-color\": true,\n  \"text-emphasis-position\": true,\n  \"text-emphasis-style\": true,\n  \"text-combine-upright\": true,\n  \"text-indent\": true,\n  \"text-justify\": true,\n  \"text-rendering\": true,\n  \"text-size-adjust\": true,\n  \"text-transform\": true,\n  \"text-underline-position\": true,\n  visibility: true,\n  \"voice-family\": true,\n  volume: true,\n  \"white-space\": true,\n  widows: true,\n  \"word-break\": true,\n  \"word-spacing\": true,\n  \"word-wrap\": true,\n  \"writing-mode\": true,\n};\n\nexport const polyfilledInheritedProps = [\n  \"box-decoration-break\",\n  // TODO: box-decoration-block should not be inherited.\n  // https://github.com/vivliostyle/vivliostyle.js/issues/259\n  \"image-resolution\",\n  \"orphans\",\n  \"widows\",\n];\n\nexport function getPolyfilledInheritedProps(): string[] {\n  const hooks: Plugin.PolyfilledInheritedPropsHook[] = Plugin.getHooksForName(\n    Plugin.HOOKS.POLYFILLED_INHERITED_PROPS,\n  );\n  return hooks.reduce(\n    (props, f) => props.concat(f()),\n    [].concat(polyfilledInheritedProps),\n  );\n}\n\nexport const supportedNamespaces = {\n  \"http://www.idpf.org/2007/ops\": true,\n  \"http://www.w3.org/1999/xhtml\": true,\n  \"http://www.w3.org/2000/svg\": true,\n};\n\nexport const coupledPatterns = [\n  \"margin-%\",\n  \"padding-%\",\n  \"border-%-width\",\n  \"border-%-style\",\n  \"border-%-color\",\n  \"%\",\n];\n\nexport const coupledExtentPatterns = [\"max-%\", \"min-%\", \"%\"];\n\nexport const geomNames: { [key: string]: boolean } = (() => {\n  const sides = [\"left\", \"right\", \"top\", \"bottom\"];\n  const names = {\n    width: true,\n    height: true,\n    \"max-width\": true,\n    \"max-height\": true,\n    \"min-width\": true,\n    \"min-height\": true,\n  };\n  for (let i = 0; i < coupledPatterns.length; i++) {\n    for (let k = 0; k < sides.length; k++) {\n      const name = coupledPatterns[i].replace(\"%\", sides[k]);\n      names[name] = true;\n    }\n  }\n  return names;\n})();\n\nexport function buildCouplingMap(\n  sideMap: { [key: string]: string },\n  extentMap: { [key: string]: string },\n): { [key: string]: string } {\n  const map = {};\n  for (const pattern of coupledPatterns) {\n    for (const side in sideMap) {\n      const name1 = pattern.replace(\"%\", side);\n      const name2 = pattern.replace(\"%\", sideMap[side]);\n      map[name1] = name2;\n      map[name2] = name1;\n    }\n  }\n  for (const extentPattern of coupledExtentPatterns) {\n    for (const extent in extentMap) {\n      const name1 = extentPattern.replace(\"%\", extent);\n      const name2 = extentPattern.replace(\"%\", extentMap[extent]);\n      map[name1] = name2;\n      map[name2] = name1;\n    }\n  }\n  return map;\n}\n\nexport const couplingMapVert = buildCouplingMap(\n  {\n    \"block-start\": \"right\",\n    \"block-end\": \"left\",\n    \"inline-start\": \"top\",\n    \"inline-end\": \"bottom\",\n  },\n  { \"block-size\": \"width\", \"inline-size\": \"height\" },\n);\n\nexport const couplingMapHor = buildCouplingMap(\n  {\n    \"block-start\": \"top\",\n    \"block-end\": \"bottom\",\n    \"inline-start\": \"left\",\n    \"inline-end\": \"right\",\n  },\n  { \"block-size\": \"height\", \"inline-size\": \"width\" },\n);\n\nexport const couplingMapVertRtl = buildCouplingMap(\n  {\n    \"block-start\": \"right\",\n    \"block-end\": \"left\",\n    \"inline-start\": \"bottom\",\n    \"inline-end\": \"top\",\n  },\n  { \"block-size\": \"width\", \"inline-size\": \"height\" },\n);\n\nexport const couplingMapHorRtl = buildCouplingMap(\n  {\n    \"block-start\": \"top\",\n    \"block-end\": \"bottom\",\n    \"inline-start\": \"right\",\n    \"inline-end\": \"left\",\n  },\n  { \"block-size\": \"height\", \"inline-size\": \"width\" },\n);\n\nexport class CascadeValue {\n  constructor(\n    public readonly value: Css.Val,\n    public readonly priority: number,\n  ) {}\n\n  getBaseValue(): CascadeValue {\n    return this;\n  }\n\n  filterValue(visitor: Css.Visitor): CascadeValue {\n    const value = this.value.visit(visitor);\n    if (value === this.value) {\n      return this;\n    }\n    return new CascadeValue(value, this.priority);\n  }\n\n  increaseSpecificity(specificity: number): CascadeValue {\n    if (specificity == 0) {\n      return this;\n    }\n    return new CascadeValue(this.value, this.priority + specificity);\n  }\n\n  evaluate(context: Exprs.Context, propName: string): Css.Val {\n    return CssParser.evaluateCSSToCSS(context, this.value, propName);\n  }\n\n  isEnabled(context: Exprs.Context): boolean {\n    return true;\n  }\n}\n\n/**\n * Internal subclass of CascadeValue. Should never be seen outside of the\n * cascade engine.\n */\nexport class ConditionalCascadeValue extends CascadeValue {\n  constructor(\n    value: Css.Val,\n    priority: number,\n    public readonly condition: Exprs.Val,\n  ) {\n    super(value, priority);\n  }\n\n  /**\n   * @override\n   */\n  getBaseValue(): CascadeValue {\n    return new CascadeValue(this.value, this.priority);\n  }\n\n  /**\n   * @override\n   */\n  filterValue(visitor: Css.Visitor): CascadeValue {\n    const value = this.value.visit(visitor);\n    if (value === this.value) {\n      return this;\n    }\n    return new ConditionalCascadeValue(value, this.priority, this.condition);\n  }\n\n  /**\n   * @override\n   */\n  increaseSpecificity(specificity: number): CascadeValue {\n    if (specificity == 0) {\n      return this;\n    }\n    return new ConditionalCascadeValue(\n      this.value,\n      this.priority + specificity,\n      this.condition,\n    );\n  }\n\n  isEnabled(context: Exprs.Context): boolean {\n    return !!this.condition.evaluate(context);\n  }\n}\n\n/**\n * @param tv current value (cannot be conditional)\n * @param av cascaded value (can be conditional)\n */\nexport function cascadeValues(\n  context: Exprs.Context,\n  tv: CascadeValue,\n  av: CascadeValue,\n): CascadeValue {\n  if ((tv == null || av.priority > tv.priority) && av.isEnabled(context)) {\n    return av.getBaseValue();\n  }\n  return tv;\n}\n\nexport type ElementStyleMap = {\n  [key: string]: ElementStyle;\n};\n\nexport const SPECIALS = {\n  \"region-id\": true,\n  \"fragment-selector-id\": true,\n};\n\nexport function isSpecialName(name: string): boolean {\n  return !!SPECIALS[name];\n}\n\nexport function isMapName(name: string): boolean {\n  return name.charAt(0) == \"_\";\n}\n\nexport function isPropName(name: string): boolean {\n  return name.charAt(0) != \"_\" && !SPECIALS[name];\n}\n\nexport function isInherited(name: string): boolean {\n  return !!inheritedProps[name];\n}\n\nexport function getProp(style: ElementStyle, name: string): CascadeValue {\n  return style[name] as CascadeValue;\n}\n\n/**\n * @return void\n */\nexport function setProp(\n  style: ElementStyle,\n  name: string,\n  value: CascadeValue,\n): any {\n  if (!value) {\n    delete style[name];\n  } else {\n    style[name] = value;\n  }\n}\n\nexport function getStyleMap(\n  style: ElementStyle,\n  name: string,\n): ElementStyleMap {\n  return style[name] as ElementStyleMap;\n}\n\nexport function getMutableStyleMap(\n  style: ElementStyle,\n  name: string,\n): ElementStyleMap {\n  let r = style[name] as ElementStyleMap;\n  if (!r) {\n    r = {};\n    style[name] = r;\n  }\n  return r;\n}\n\nexport const getViewConditionalStyleMap = (\n  style: ElementStyle,\n): { matcher: Matchers.Matcher; styles: ElementStyleMap }[] => {\n  let r = style[\"_viewConditionalStyles\"] as {\n    matcher: Matchers.Matcher;\n    styles: ElementStyleMap;\n  }[];\n  if (!r) {\n    r = [];\n    style[\"_viewConditionalStyles\"] = r;\n  }\n  return r;\n};\n\nexport function getSpecial(style: ElementStyle, name: string): CascadeValue[] {\n  return style[name] as CascadeValue[];\n}\n\nexport function getMutableSpecial(\n  style: ElementStyle,\n  name: string,\n): CascadeValue[] {\n  let r = style[name] as CascadeValue[];\n  if (!r) {\n    r = [];\n    style[name] = r;\n  }\n  return r;\n}\n\nexport function mergeIn(\n  context: Exprs.Context,\n  target: ElementStyle,\n  style: ElementStyle,\n  specificity: number,\n  pseudoelement: string | null,\n  regionId: string | null,\n  viewConditionMatcher: Matchers.Matcher | null,\n): void {\n  const hierarchy = [\n    { id: pseudoelement, styleKey: \"_pseudos\" },\n    { id: regionId, styleKey: \"_regions\" },\n  ];\n  hierarchy.forEach((item) => {\n    if (item.id) {\n      const styleMap = getMutableStyleMap(target, item.styleKey);\n      target = styleMap[item.id];\n      if (!target) {\n        target = {} as ElementStyle;\n        styleMap[item.id] = target;\n      }\n    }\n  });\n  if (viewConditionMatcher) {\n    const styleMap = getViewConditionalStyleMap(target);\n    target = {} as ElementStyle;\n    styleMap.push({\n      styles: target as ElementStyleMap,\n      matcher: viewConditionMatcher,\n    });\n  }\n  for (const prop in style) {\n    if (isMapName(prop)) {\n      continue;\n    }\n    if (isSpecialName(prop)) {\n      // special properties: list of all assigned values\n      const as = getSpecial(style, prop);\n      const ts = getMutableSpecial(target, prop);\n      Array.prototype.push.apply(ts, as);\n    } else {\n      // regular properties: higher priority wins\n      const av = getProp(style, prop).increaseSpecificity(specificity);\n      const tv = getProp(target, prop);\n      setProp(target, prop, cascadeValues(context, tv, av));\n    }\n  }\n}\n\nexport function mergeAll(\n  context: Exprs.Context,\n  styles: ElementStyle[],\n): ElementStyle {\n  const target = {} as ElementStyle;\n  for (let k = 0; k < styles.length; k++) {\n    mergeIn(context, target, styles[k], 0, null, null, null);\n  }\n  return target;\n}\n\nexport function chainActions(\n  chain: ChainedAction[],\n  action: CascadeAction,\n): CascadeAction {\n  if (chain.length > 0) {\n    chain.sort((a, b) => b.getPriority() - a.getPriority());\n    let chained: ChainedAction | null = null;\n    for (let i = chain.length - 1; i >= 0; i--) {\n      chained = chain[i];\n      chained.chained = action;\n      action = chained;\n    }\n    return chained;\n  }\n  return action;\n}\n\nexport class InheritanceVisitor extends Css.FilterVisitor {\n  propName: string = \"\";\n\n  constructor(\n    public readonly props: ElementStyle,\n    public readonly context: Exprs.Context,\n  ) {\n    super();\n  }\n\n  setPropName(name: string): void {\n    this.propName = name;\n  }\n\n  private getFontSize() {\n    const cascval = getProp(this.props, \"font-size\");\n    const n = cascval.value as Css.Numeric;\n    if (!Exprs.isAbsoluteLengthUnit(n.unit)) {\n      throw new Error(\"Unexpected state\");\n    }\n    return n.num * Exprs.defaultUnitSizes[n.unit];\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Css.Numeric): Css.Val {\n    Asserts.assert(this.context);\n    if (this.propName === \"font-size\") {\n      return convertFontSizeToPx(numeric, this.getFontSize(), this.context);\n    } else if (\n      numeric.unit == \"em\" ||\n      numeric.unit == \"ex\" ||\n      numeric.unit == \"rem\"\n    ) {\n      return convertFontRelativeLengthToPx(\n        numeric,\n        this.getFontSize(),\n        this.context,\n      );\n    } else if (numeric.unit == \"%\") {\n      if (this.propName === \"line-height\") {\n        return numeric;\n      }\n      const unit = this.propName.match(/height|^(top|bottom)$/) ? \"vh\" : \"vw\";\n      return new Css.Numeric(numeric.num, unit);\n    }\n    return numeric;\n  }\n\n  /**\n   * @override\n   */\n  visitExpr(expr: Css.Expr): Css.Val {\n    if (this.propName == \"font-size\") {\n      const val = CssParser.evaluateCSSToCSS(this.context, expr, this.propName);\n      return val.visit(this);\n    }\n    return expr;\n  }\n}\n\nexport function convertFontRelativeLengthToPx(\n  numeric: Css.Numeric,\n  baseFontSize: number,\n  context: Exprs.Context,\n): Css.Numeric {\n  const unit = numeric.unit;\n  const num = numeric.num;\n  if (unit === \"em\" || unit === \"ex\") {\n    const ratio = Exprs.defaultUnitSizes[unit] / Exprs.defaultUnitSizes[\"em\"];\n    return new Css.Numeric(num * ratio * baseFontSize, \"px\");\n  } else if (unit === \"rem\") {\n    return new Css.Numeric(num * context.fontSize(), \"px\");\n  } else {\n    return numeric;\n  }\n}\n\nexport function convertFontSizeToPx(\n  numeric: Css.Numeric,\n  parentFontSize: number,\n  context: Exprs.Context,\n): Css.Numeric {\n  numeric = convertFontRelativeLengthToPx(numeric, parentFontSize, context);\n  const unit = numeric.unit;\n  const num = numeric.num;\n  if (unit === \"px\") {\n    return numeric;\n  } else if (unit === \"%\") {\n    return new Css.Numeric((num / 100) * parentFontSize, \"px\");\n  } else {\n    return new Css.Numeric(num * context.queryUnitSize(unit, false), \"px\");\n  }\n}\n\nexport type ActionTable = {\n  [key: string]: CascadeAction;\n};\n\nexport class CascadeAction {\n  apply(cascadeInstance: CascadeInstance): void {}\n\n  mergeWith(other: CascadeAction): CascadeAction {\n    return new CompoundAction([this, other]);\n  }\n\n  clone(): CascadeAction {\n    // Mutable actions will override\n    return this;\n  }\n}\n\nexport class ConditionItemAction extends CascadeAction {\n  constructor(public readonly conditionItem: ConditionItem) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    cascadeInstance.pushConditionItem(\n      this.conditionItem.fresh(cascadeInstance),\n    );\n  }\n}\n\nexport class CompoundAction extends CascadeAction {\n  constructor(public readonly list: CascadeAction[]) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    for (let i = 0; i < this.list.length; i++) {\n      this.list[i].apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  mergeWith(other: CascadeAction): CascadeAction {\n    this.list.push(other);\n    return this;\n  }\n\n  /**\n   * @override\n   */\n  clone(): CascadeAction {\n    return new CompoundAction([].concat(this.list));\n  }\n}\n\nexport class ApplyRuleAction extends CascadeAction {\n  constructor(\n    public readonly style: ElementStyle,\n    public readonly specificity: number,\n    public readonly pseudoelement: string | null,\n    public readonly regionId: string | null,\n    public readonly viewConditionId: string | null,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    mergeIn(\n      cascadeInstance.context,\n      cascadeInstance.currentStyle,\n      this.style,\n      this.specificity,\n      this.pseudoelement,\n      this.regionId,\n      cascadeInstance.buildViewConditionMatcher(this.viewConditionId),\n    );\n  }\n}\n\nexport class ChainedAction extends CascadeAction {\n  chained: CascadeAction = null;\n\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    this.chained.apply(cascadeInstance);\n  }\n\n  getPriority(): number {\n    return 0;\n  }\n\n  makePrimary(cascade: Cascade): boolean {\n    // cannot be made primary\n    return false;\n  }\n}\n\nexport class CheckClassAction extends ChainedAction {\n  constructor(public readonly className: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.currentClassNames.includes(this.className)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 10;\n  }\n  // class should be checked after id\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    if (this.chained) {\n      cascade.insertInTable(cascade.classes, this.className, this.chained);\n    }\n    return true;\n  }\n}\n\nexport class CheckIdAction extends ChainedAction {\n  constructor(public readonly id: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (\n      cascadeInstance.currentId == this.id ||\n      cascadeInstance.currentXmlId == this.id\n    ) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 11;\n  }\n  // id should be checked after :root\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    if (this.chained) {\n      cascade.insertInTable(cascade.ids, this.id, this.chained);\n    }\n    return true;\n  }\n}\n\nexport class CheckLocalNameAction extends ChainedAction {\n  constructor(public readonly localName: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.currentLocalName == this.localName) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 8;\n  }\n  // tag is a pretty good thing to check, after epub:type\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    if (this.chained) {\n      cascade.insertInTable(cascade.tags, this.localName, this.chained);\n    }\n    return true;\n  }\n}\n\nexport class CheckNSTagAction extends ChainedAction {\n  constructor(public readonly ns: string, public readonly localName: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (\n      cascadeInstance.currentLocalName == this.localName &&\n      cascadeInstance.currentNamespace == this.ns\n    ) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 8;\n  }\n  // tag is a pretty good thing to check, after epub:type\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    if (this.chained) {\n      let prefix = cascade.nsPrefix[this.ns];\n      if (!prefix) {\n        prefix = `ns${cascade.nsCount++}:`;\n        cascade.nsPrefix[this.ns] = prefix;\n      }\n      const nsTag = prefix + this.localName;\n      cascade.insertInTable(cascade.nstags, nsTag, this.chained);\n    }\n    return true;\n  }\n}\n\nexport class CheckTargetEpubTypeAction extends ChainedAction {\n  constructor(public readonly epubTypePatt: RegExp) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const elem = cascadeInstance.currentElement;\n    if (elem && cascadeInstance.currentLocalName == \"a\") {\n      const href = elem.getAttribute(\"href\");\n      if (href && href.match(/^#/)) {\n        const id = href.substring(1);\n        const target = elem.ownerDocument.getElementById(id);\n        if (target) {\n          const epubType = target.getAttributeNS(Base.NS.epub, \"type\");\n          if (epubType && epubType.match(this.epubTypePatt)) {\n            this.chained.apply(cascadeInstance);\n          }\n        }\n      }\n    }\n  }\n}\n\nexport class CheckNamespaceAction extends ChainedAction {\n  constructor(public readonly ns: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.currentNamespace == this.ns) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n}\n\nexport class CheckAttributePresentAction extends ChainedAction {\n  constructor(public readonly ns: string, public readonly name: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (\n      cascadeInstance.currentElement &&\n      cascadeInstance.currentElement.hasAttributeNS(this.ns, this.name)\n    ) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n}\n\nexport class CheckAttributeEqAction extends ChainedAction {\n  constructor(\n    public readonly ns: string,\n    public readonly name: string,\n    public readonly value: string,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (\n      cascadeInstance.currentElement &&\n      cascadeInstance.currentElement.getAttributeNS(this.ns, this.name) ==\n        this.value\n    ) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    if (this.name == \"type\" && this.ns == Base.NS.epub) {\n      return 9; // epub:type is a pretty good thing to check\n    }\n    return 0;\n  }\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    if (this.name == \"type\" && this.ns == Base.NS.epub) {\n      if (this.chained) {\n        cascade.insertInTable(cascade.epubtypes, this.value, this.chained);\n      }\n      return true;\n    }\n    return false;\n  }\n}\n\nexport class CheckNamespaceSupportedAction extends ChainedAction {\n  constructor(public readonly ns: string, public readonly name: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.currentElement) {\n      const ns = cascadeInstance.currentElement.getAttributeNS(\n        this.ns,\n        this.name,\n      );\n      if (ns && supportedNamespaces[ns]) {\n        this.chained.apply(cascadeInstance);\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 0;\n  }\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: Cascade): boolean {\n    return false;\n  }\n}\n\nexport class CheckAttributeRegExpAction extends ChainedAction {\n  constructor(\n    public readonly ns: string,\n    public readonly name: string,\n    public readonly regexp: RegExp,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.currentElement) {\n      const attr = cascadeInstance.currentElement.getAttributeNS(\n        this.ns,\n        this.name,\n      );\n      if (attr && attr.match(this.regexp)) {\n        this.chained.apply(cascadeInstance);\n      }\n    }\n  }\n}\n\nexport class CheckLangAction extends ChainedAction {\n  constructor(public readonly langRegExp: RegExp) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.lang.match(this.langRegExp)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n}\n\nexport class IsFirstAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.isFirst) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 6;\n  }\n}\n\nexport class IsRootAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.isRoot) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 12; // :root is the first thing to check\n  }\n}\n\nexport class IsNthAction extends ChainedAction {\n  constructor(public readonly a: number, public readonly b: number) {\n    super();\n  }\n\n  /**\n   * Checkes whether given order can be represented as an+b with a non-negative\n   * interger n\n   */\n  protected matchANPlusB(order: number): boolean {\n    return Matchers.matchANPlusB(order, this.a, this.b);\n  }\n}\n\nexport class IsNthSiblingAction extends IsNthAction {\n  constructor(a: number, b: number) {\n    super(a, b);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (this.matchANPlusB(cascadeInstance.currentSiblingOrder)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class IsNthSiblingOfTypeAction extends IsNthAction {\n  constructor(a: number, b: number) {\n    super(a, b);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const order =\n      cascadeInstance.currentSiblingTypeCounts[\n        cascadeInstance.currentNamespace\n      ][cascadeInstance.currentLocalName];\n    if (this.matchANPlusB(order)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class IsNthLastSiblingAction extends IsNthAction {\n  constructor(a: number, b: number) {\n    super(a, b);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    let order = cascadeInstance.currentFollowingSiblingOrder;\n    if (order === null) {\n      order = cascadeInstance.currentFollowingSiblingOrder =\n        cascadeInstance.currentElement.parentNode.childElementCount -\n        cascadeInstance.currentSiblingOrder +\n        1;\n    }\n    if (this.matchANPlusB(order)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 4;\n  }\n}\n\nexport class IsNthLastSiblingOfTypeAction extends IsNthAction {\n  constructor(a: number, b: number) {\n    super(a, b);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const counts = cascadeInstance.currentFollowingSiblingTypeCounts;\n    if (!counts[cascadeInstance.currentNamespace]) {\n      let elem = cascadeInstance.currentElement;\n      do {\n        const ns = elem.namespaceURI;\n        const localName = elem.localName;\n        let nsCounts = counts[ns];\n        if (!nsCounts) {\n          nsCounts = counts[ns] = {};\n        }\n        nsCounts[localName] = (nsCounts[localName] || 0) + 1;\n      } while ((elem = elem.nextElementSibling));\n    }\n    if (\n      this.matchANPlusB(\n        counts[cascadeInstance.currentNamespace][\n          cascadeInstance.currentLocalName\n        ],\n      )\n    ) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 4;\n  }\n}\n\nexport class IsEmptyAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    let node: Node | null = cascadeInstance.currentElement.firstChild;\n    while (node) {\n      switch (node.nodeType) {\n        case Node.ELEMENT_NODE:\n          return;\n        case Node.TEXT_NODE:\n          if ((node as Text).length > 0) {\n            return;\n          }\n      }\n      node = node.nextSibling;\n    }\n    this.chained.apply(cascadeInstance);\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 4;\n  }\n}\n\nexport class IsEnabledAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const elem = cascadeInstance.currentElement;\n    if ((elem as any).disabled === false) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class IsDisabledAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const elem = cascadeInstance.currentElement;\n    if ((elem as any).disabled === true) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class IsCheckedAction extends ChainedAction {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    const elem = cascadeInstance.currentElement;\n    if ((elem as any).selected === true || (elem as any).checked === true) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class CheckConditionAction extends ChainedAction {\n  constructor(public readonly condition: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    if (cascadeInstance.conditions[this.condition]) {\n      try {\n        cascadeInstance.dependentConditions.push(this.condition);\n        this.chained.apply(cascadeInstance);\n      } finally {\n        cascadeInstance.dependentConditions.pop();\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 5;\n  }\n}\n\nexport class CheckAppliedAction extends CascadeAction {\n  applied = false;\n\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    this.applied = true;\n  }\n\n  /**\n   * @override\n   */\n  clone(): CascadeAction {\n    const cloned = new CheckAppliedAction();\n    cloned.applied = this.applied;\n    return cloned;\n  }\n}\n\nexport class NegateActionsSet extends ChainedAction {\n  checkAppliedAction: CheckAppliedAction;\n  firstAction: CascadeAction;\n\n  constructor(list: ChainedAction[]) {\n    super();\n    this.checkAppliedAction = new CheckAppliedAction();\n    this.firstAction = chainActions(list, this.checkAppliedAction);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CascadeInstance): void {\n    this.firstAction.apply(cascadeInstance);\n    if (!this.checkAppliedAction.applied) {\n      this.chained.apply(cascadeInstance);\n    }\n    this.checkAppliedAction.applied = false;\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return (this.firstAction as ChainedAction).getPriority();\n  }\n}\n\n/**\n * An object that is notified as elements are pushed and popped and typically\n * controls a \"named condition\" (which is a count associated with a name).\n */\nexport interface ConditionItem {\n  /**\n   * Returns a \"fresh\" copy of this item. May be this if immutable.\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem;\n\n  /**\n   * Depth is 0 for element itself and its siblings, 1 for direct children and\n   * -1 for the parent.\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean;\n\n  /**\n   * @return return true if no more notifications are desired\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean;\n}\n\nexport class AbstractConditionItem {\n  constructor(\n    public readonly condition: string,\n    public readonly viewConditionId: string | null,\n    public readonly viewCondition: Matchers.Matcher,\n  ) {}\n\n  increment(cascadeInstance: CascadeInstance) {\n    cascadeInstance.increment(this.condition, this.viewCondition);\n  }\n\n  decrement(cascadeInstance: CascadeInstance) {\n    cascadeInstance.decrement(this.condition, this.viewCondition);\n  }\n\n  buildViewConditionMatcher(\n    cascadeInstance: CascadeInstance,\n  ): Matchers.Matcher {\n    return cascadeInstance.buildViewConditionMatcher(this.viewConditionId);\n  }\n}\n\nexport class DescendantConditionItem extends AbstractConditionItem\n  implements ConditionItem {\n  constructor(\n    condition: string,\n    viewConditionId: string | null,\n    viewCondition: Matchers.Matcher,\n  ) {\n    super(condition, viewConditionId, viewCondition);\n  }\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return new DescendantConditionItem(\n      this.condition,\n      this.viewConditionId,\n      this.buildViewConditionMatcher(cascadeInstance),\n    );\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      this.increment(cascadeInstance);\n    }\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      this.decrement(cascadeInstance);\n      return true;\n    }\n    return false;\n  }\n}\n\nexport class ChildConditionItem extends AbstractConditionItem\n  implements ConditionItem {\n  constructor(\n    condition: string,\n    viewConditionId: string | null,\n    viewCondition: Matchers.Matcher,\n  ) {\n    super(condition, viewConditionId, viewCondition);\n  }\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return new ChildConditionItem(\n      this.condition,\n      this.viewConditionId,\n      this.buildViewConditionMatcher(cascadeInstance),\n    );\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      this.increment(cascadeInstance);\n    } else if (depth == 1) {\n      this.decrement(cascadeInstance);\n    }\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      this.decrement(cascadeInstance);\n      return true;\n    } else if (depth == 1) {\n      this.increment(cascadeInstance);\n    }\n    return false;\n  }\n}\n\nexport class AdjacentSiblingConditionItem extends AbstractConditionItem\n  implements ConditionItem {\n  fired: boolean = false;\n\n  constructor(\n    condition: string,\n    viewConditionId: string | null,\n    viewCondition: Matchers.Matcher,\n  ) {\n    super(condition, viewConditionId, viewCondition);\n  }\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return new AdjacentSiblingConditionItem(\n      this.condition,\n      this.viewConditionId,\n      this.buildViewConditionMatcher(cascadeInstance),\n    );\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (this.fired) {\n      this.decrement(cascadeInstance);\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (this.fired) {\n      this.decrement(cascadeInstance);\n      return true;\n    }\n    if (depth == 0) {\n      // Leaving element that triggered this item.\n      this.fired = true;\n      this.increment(cascadeInstance);\n    }\n    return false;\n  }\n}\n\nexport class FollowingSiblingConditionItem extends AbstractConditionItem\n  implements ConditionItem {\n  fired: boolean = false;\n\n  constructor(\n    condition: string,\n    viewConditionId: string | null,\n    viewCondition: Matchers.Matcher,\n  ) {\n    super(condition, viewConditionId, viewCondition);\n  }\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return new FollowingSiblingConditionItem(\n      this.condition,\n      this.viewConditionId,\n      this.buildViewConditionMatcher(cascadeInstance),\n    );\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (this.fired) {\n      if (depth == -1) {\n        this.increment(cascadeInstance);\n      } else if (depth == 0) {\n        this.decrement(cascadeInstance);\n      }\n    }\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (this.fired) {\n      if (depth == -1) {\n        this.decrement(cascadeInstance);\n        return true;\n      } else if (depth == 0) {\n        this.increment(cascadeInstance);\n      }\n    } else {\n      if (depth == 0) {\n        // Leaving element that triggered this item.\n        this.fired = true;\n        this.increment(cascadeInstance);\n      }\n    }\n    return false;\n  }\n}\n\n/**\n * Not a true condition item, this class manages proper handling of \"after\"\n * pseudoelement.\n */\nexport class AfterPseudoelementItem implements ConditionItem {\n  constructor(\n    public readonly afterprop: ElementStyle,\n    public readonly element: Element,\n  ) {}\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return this;\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      cascadeInstance.processPseudoelementProps(this.afterprop, this.element);\n      return true;\n    }\n    return false;\n  }\n}\n\n/**\n * Not a true condition item, this class restores current language.\n */\nexport class RestoreLangItem implements ConditionItem {\n  constructor(public readonly lang: string) {}\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return this;\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      cascadeInstance.lang = this.lang;\n      return true;\n    }\n    return false;\n  }\n}\n\n/**\n * Not a true condition item, this class manages inheritance of quotes property\n */\nexport class QuotesScopeItem implements ConditionItem {\n  constructor(public readonly oldQuotes: Css.Str[]) {}\n\n  /**\n   * @override\n   */\n  fresh(cascadeInstance: CascadeInstance): ConditionItem {\n    return this;\n  }\n\n  /**\n   * @override\n   */\n  push(cascadeInstance: CascadeInstance, depth: number): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  pop(cascadeInstance: CascadeInstance, depth: number): boolean {\n    if (depth == 0) {\n      cascadeInstance.quotes = this.oldQuotes;\n      return true;\n    }\n    return false;\n  }\n}\nexport type CounterValues = {\n  [key: string]: number[];\n};\n\nexport interface CounterListener {\n  countersOfId(id: string, counters: CounterValues);\n\n  getExprContentListener(): Vtree.ExprContentListener;\n}\n\nexport interface CounterResolver {\n  /**\n   * Returns an Exprs.Val, whose value is calculated at the layout time by\n   * retrieving the innermost page-based counter (null if it does not exist) by\n   * its name and formatting the value into a string.\n   * @param name Name of the page-based counter to be retrieved\n   * @param format A function that formats the counter value into a string\n   */\n  getPageCounterVal(\n    name: string,\n    format: (p1: number | null) => string,\n  ): Exprs.Val;\n\n  /**\n   * Returns an Exprs.Val, whose value is calculated at the layout time by\n   * retrieving the page-based counters by its name and formatting the values\n   * into a string.\n   * @param name Name of the page-based counters to be retrieved\n   * @param format A function that formats the counter values (passed as an\n   *     array ordered by the nesting depth with the outermost counter first and\n   *     the innermost last) into a string\n   */\n  getPageCountersVal(name: string, format: (p1: number[]) => string): Exprs.Val;\n\n  getTargetCounterVal(\n    url: string,\n    name: string,\n    format: (p1: number | null) => string,\n  ): Exprs.Val;\n\n  getTargetCountersVal(\n    url: string,\n    name: string,\n    format: (p1: number[]) => string,\n  ): Exprs.Val;\n\n  setStyler(styler: any);\n}\n\nexport class AttrValueFilterVisitor extends Css.FilterVisitor {\n  constructor(public element: Element) {\n    super();\n  }\n\n  private createValueFromString(str: string | null, type: string): Css.Val {\n    switch (type) {\n      case \"url\":\n        if (str) {\n          return new Css.URL(str); // TODO should convert to absolute path\n        }\n        return new Css.URL(\"about:invalid\");\n      case \"string\":\n      default:\n        if (str) {\n          return new Css.Str(str);\n        }\n        return new Css.Str(\"\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    if (func.name !== \"attr\") {\n      return super.visitFunc(func);\n    }\n    let type = \"string\";\n    let attributeName: string | null = null;\n    let defaultValue: Css.Val = null;\n    if (func.values[0] instanceof Css.SpaceList) {\n      const values = (func.values[0] as Css.SpaceList).values;\n      if (values.length >= 2) {\n        type = values[1].stringValue();\n      }\n      attributeName = values[0].stringValue();\n    } else {\n      attributeName = func.values[0].stringValue();\n    }\n    if (func.values.length > 1) {\n      defaultValue = this.createValueFromString(\n        func.values[1].stringValue(),\n        type,\n      );\n    } else {\n      defaultValue = this.createValueFromString(null, type);\n    }\n    if (this.element && this.element.hasAttribute(attributeName)) {\n      return this.createValueFromString(\n        this.element.getAttribute(attributeName),\n        type,\n      );\n    }\n    return defaultValue;\n  }\n}\n\nexport class ContentPropVisitor extends Css.FilterVisitor {\n  constructor(\n    public cascade: CascadeInstance,\n    public element: Element,\n    public readonly counterResolver: CounterResolver,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    const cascade = this.cascade;\n    const quotes = cascade.quotes;\n    const maxDepth = Math.floor(quotes.length / 2) - 1;\n    switch (ident.name) {\n      case \"open-quote\": {\n        const result = quotes[2 * Math.min(maxDepth, cascade.quoteDepth)];\n        cascade.quoteDepth++;\n        return result;\n      }\n      case \"close-quote\":\n        if (cascade.quoteDepth > 0) {\n          cascade.quoteDepth--;\n        }\n        return quotes[2 * Math.min(maxDepth, cascade.quoteDepth) + 1];\n      case \"no-open-quote\":\n        cascade.quoteDepth++;\n        return new Css.Str(\"\");\n      case \"no-close-quote\":\n        if (cascade.quoteDepth > 0) {\n          cascade.quoteDepth--;\n        }\n        return new Css.Str(\"\");\n    }\n    return ident;\n  }\n\n  private format(num: number, type: string): string {\n    let upper = false; // type == \"armenian\";\n    // content-counter-10.xht assumes armenian is uppercase, enable if desired\n\n    let lower = false;\n    let r: RegExpMatchArray;\n    if ((r = type.match(/^upper-(.*)/)) != null) {\n      upper = true;\n      type = r[1];\n    } else if ((r = type.match(/^lower-(.*)/)) != null) {\n      lower = true;\n      type = r[1];\n    }\n    let result = \"\";\n    if (additiveNumbering[type]) {\n      result = additiveFormat(additiveNumbering[type], num);\n    } else if (alphabeticNumbering[type]) {\n      result = alphabeticFormat(alphabeticNumbering[type], num);\n    } else if (fixed[type] != null) {\n      result = fixed[type];\n    } else if (type == \"decimal-leading-zero\") {\n      result = `${num}`;\n      if (result.length == 1) {\n        result = `0${result}`;\n      }\n    } else if (type == \"cjk-ideographic\" || type == \"trad-chinese-informal\") {\n      result = chineseCounter(num, chineseTradInformal);\n    } else {\n      result = `${num}`;\n    }\n    if (upper) {\n      return result.toUpperCase();\n    }\n    if (lower) {\n      return result.toLowerCase();\n    }\n    return result;\n  }\n\n  visitFuncCounter(values: Css.Val[]): Css.Val {\n    const counterName = values[0].toString();\n    const type = values.length > 1 ? values[1].stringValue() : \"decimal\";\n    const arr = this.cascade.counters[counterName];\n    if (arr && arr.length) {\n      const numval = (arr && arr.length && arr[arr.length - 1]) || 0;\n      return new Css.Str(this.format(numval, type));\n    } else {\n      const self = this;\n      const c = new Css.Expr(\n        this.counterResolver.getPageCounterVal(counterName, (numval) =>\n          self.format(numval || 0, type),\n        ),\n      );\n      return new Css.SpaceList([c]);\n    }\n  }\n\n  visitFuncCounters(values: Css.Val[]): Css.Val {\n    const counterName = values[0].toString();\n    const separator = values[1].stringValue();\n    const type = values.length > 2 ? values[2].stringValue() : \"decimal\";\n    const arr = this.cascade.counters[counterName];\n    const sb = new Base.StringBuffer();\n    if (arr && arr.length) {\n      for (let i = 0; i < arr.length; i++) {\n        if (i > 0) {\n          sb.append(separator);\n        }\n        sb.append(this.format(arr[i], type));\n      }\n    }\n    const self = this;\n    const c = new Css.Expr(\n      this.counterResolver.getPageCountersVal(counterName, (numvals) => {\n        const parts = [] as string[];\n        if (numvals.length) {\n          for (let i = 0; i < numvals.length; i++) {\n            parts.push(self.format(numvals[i], type));\n          }\n        }\n        const elementCounters = sb.toString();\n        if (elementCounters.length) {\n          parts.push(elementCounters);\n        }\n        if (parts.length) {\n          return parts.join(separator);\n        } else {\n          return self.format(0, type);\n        }\n      }),\n    );\n    return new Css.SpaceList([c]);\n  }\n\n  visitFuncTargetCounter(values: Css.Val[]): Css.Val {\n    const targetUrl = values[0];\n    let targetUrlStr: string;\n    if (targetUrl instanceof Css.URL) {\n      targetUrlStr = targetUrl.url;\n    } else {\n      targetUrlStr = targetUrl.stringValue();\n    }\n    const counterName = values[1].toString();\n    const type = values.length > 2 ? values[2].stringValue() : \"decimal\";\n    const self = this;\n    const c = new Css.Expr(\n      this.counterResolver.getTargetCounterVal(\n        targetUrlStr,\n        counterName,\n        (numval) => self.format(numval || 0, type),\n      ),\n    );\n    return new Css.SpaceList([c]);\n  }\n\n  visitFuncTargetCounters(values: Css.Val[]): Css.Val {\n    const targetUrl = values[0];\n    let targetUrlStr: string;\n    if (targetUrl instanceof Css.URL) {\n      targetUrlStr = targetUrl.url;\n    } else {\n      targetUrlStr = targetUrl.stringValue();\n    }\n    const counterName = values[1].toString();\n    const separator = values[2].stringValue();\n    const type = values.length > 3 ? values[3].stringValue() : \"decimal\";\n    const self = this;\n    const c = new Css.Expr(\n      this.counterResolver.getTargetCountersVal(\n        targetUrlStr,\n        counterName,\n        (numvals) => {\n          const parts = numvals.map((numval) => self.format(numval, type));\n          if (parts.length) {\n            return parts.join(separator);\n          } else {\n            return self.format(0, type);\n          }\n        },\n      ),\n    );\n    return new Css.SpaceList([c]);\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    switch (func.name) {\n      case \"counter\":\n        if (func.values.length <= 2) {\n          return this.visitFuncCounter(func.values);\n        }\n        break;\n      case \"counters\":\n        if (func.values.length <= 3) {\n          return this.visitFuncCounters(func.values);\n        }\n        break;\n      case \"target-counter\":\n        if (func.values.length <= 3) {\n          return this.visitFuncTargetCounter(func.values);\n        }\n        break;\n      case \"target-counters\":\n        if (func.values.length <= 4) {\n          return this.visitFuncTargetCounters(func.values);\n        }\n        break;\n    }\n    Logging.logger.warn(\"E_CSS_CONTENT_PROP:\", func.toString());\n    return new Css.Str(\"\");\n  }\n}\n\nexport function roman(num: number): string {\n  if (num <= 0 || num != Math.round(num) || num > 3999) {\n    return \"\";\n  }\n  const digits = [\"I\", \"V\", \"X\", \"L\", \"C\", \"D\", \"M\"];\n  let offset = 0;\n  let acc = \"\";\n  while (num > 0) {\n    let digit = num % 10;\n    num = (num - digit) / 10;\n    let result = \"\";\n    if (digit == 9) {\n      result += digits[offset] + digits[offset + 2];\n    } else if (digit == 4) {\n      result += digits[offset] + digits[offset + 1];\n    } else {\n      if (digit >= 5) {\n        result += digits[offset + 1];\n        digit -= 5;\n      }\n      while (digit > 0) {\n        result += digits[offset];\n        digit--;\n      }\n    }\n    acc = result + acc;\n    offset += 2;\n  }\n  return acc;\n}\n\nexport const additiveNumbering = {\n  roman: [\n    4999,\n    1000,\n    \"M\",\n    900,\n    \"CM\",\n    500,\n    \"D\",\n    400,\n    \"CD\",\n    100,\n    \"C\",\n    90,\n    \"XC\",\n    50,\n    \"L\",\n    40,\n    \"XL\",\n    10,\n    \"X\",\n    9,\n    \"IX\",\n    5,\n    \"V\",\n    4,\n    \"IV\",\n    1,\n    \"I\",\n  ],\n  armenian: [\n    9999,\n    9000,\n    \"\\u0584\",\n    8000,\n    \"\\u0583\",\n    7000,\n    \"\\u0582\",\n    6000,\n    \"\\u0581\",\n    5000,\n    \"\\u0580\",\n    4000,\n    \"\\u057f\",\n    3000,\n    \"\\u057e\",\n    2000,\n    \"\\u057d\",\n    1000,\n    \"\\u057c\",\n    900,\n    \"\\u057b\",\n    800,\n    \"\\u057a\",\n    700,\n    \"\\u0579\",\n    600,\n    \"\\u0578\",\n    500,\n    \"\\u0577\",\n    400,\n    \"\\u0576\",\n    300,\n    \"\\u0575\",\n    200,\n    \"\\u0574\",\n    100,\n    \"\\u0573\",\n    90,\n    \"\\u0572\",\n    80,\n    \"\\u0571\",\n    70,\n    \"\\u0570\",\n    60,\n    \"\\u056f\",\n    50,\n    \"\\u056e\",\n    40,\n    \"\\u056d\",\n    30,\n    \"\\u056c\",\n    20,\n    \"\\u056b\",\n    10,\n    \"\\u056a\",\n    9,\n    \"\\u0569\",\n    8,\n    \"\\u0568\",\n    7,\n    \"\\u0567\",\n    6,\n    \"\\u0566\",\n    5,\n    \"\\u0565\",\n    4,\n    \"\\u0564\",\n    3,\n    \"\\u0563\",\n    2,\n    \"\\u0562\",\n    1,\n    \"\\u0561\",\n  ],\n  georgian: [\n    19999,\n    10000,\n    \"\\u10f5\",\n    9000,\n    \"\\u10f0\",\n    8000,\n    \"\\u10ef\",\n    7000,\n    \"\\u10f4\",\n    6000,\n    \"\\u10ee\",\n    5000,\n    \"\\u10ed\",\n    4000,\n    \"\\u10ec\",\n    3000,\n    \"\\u10eb\",\n    2000,\n    \"\\u10ea\",\n    1000,\n    \"\\u10e9\",\n    900,\n    \"\\u10e8\",\n    800,\n    \"\\u10e7\",\n    700,\n    \"\\u10e6\",\n    600,\n    \"\\u10e5\",\n    500,\n    \"\\u10e4\",\n    400,\n    \"\\u10f3\",\n    300,\n    \"\\u10e2\",\n    200,\n    \"\\u10e1\",\n    100,\n    \"\\u10e0\",\n    90,\n    \"\\u10df\",\n    80,\n    \"\\u10de\",\n    70,\n    \"\\u10dd\",\n    60,\n    \"\\u10f2\",\n    50,\n    \"\\u10dc\",\n    40,\n    \"\\u10db\",\n    30,\n    \"\\u10da\",\n    20,\n    \"\\u10d9\",\n    10,\n    \"\\u10d8\",\n    9,\n    \"\\u10d7\",\n    8,\n    \"\\u10f1\",\n    7,\n    \"\\u10d6\",\n    6,\n    \"\\u10d5\",\n    5,\n    \"\\u10d4\",\n    4,\n    \"\\u10d3\",\n    3,\n    \"\\u10d2\",\n    2,\n    \"\\u10d1\",\n    1,\n    \"\\u10d0\",\n  ],\n  hebrew: [\n    999,\n    400,\n    \"\\u05ea\",\n    300,\n    \"\\u05e9\",\n    200,\n    \"\\u05e8\",\n    100,\n    \"\\u05e7\",\n    90,\n    \"\\u05e6\",\n    80,\n    \"\\u05e4\",\n    70,\n    \"\\u05e2\",\n    60,\n    \"\\u05e1\",\n    50,\n    \"\\u05e0\",\n    40,\n    \"\\u05de\",\n    30,\n    \"\\u05dc\",\n    20,\n    \"\\u05db\",\n    19,\n    \"\\u05d9\\u05d8\",\n    18,\n    \"\\u05d9\\u05d7\",\n    17,\n    \"\\u05d9\\u05d6\",\n    16,\n    \"\\u05d8\\u05d6\",\n    15,\n    \"\\u05d8\\u05d5\",\n    10,\n    \"\\u05d9\",\n    9,\n    \"\\u05d8\",\n    8,\n    \"\\u05d7\",\n    7,\n    \"\\u05d6\",\n    6,\n    \"\\u05d5\",\n    5,\n    \"\\u05d4\",\n    4,\n    \"\\u05d3\",\n    3,\n    \"\\u05d2\",\n    2,\n    \"\\u05d1\",\n    1,\n    \"\\u05d0\",\n  ],\n};\n\nexport const alphabeticNumbering = {\n  latin: \"a-z\",\n  alpha: \"a-z\",\n  greek: \"\\u03b1-\\u03c1\\u03c3-\\u03c9\",\n  russian: \"\\u0430-\\u0438\\u043a-\\u0449\\u044d-\\u044f\",\n};\n\nexport const fixed = {\n  square: \"\\u25a0\",\n  disc: \"\\u2022\",\n  circle: \"\\u25e6\",\n  none: \"\",\n};\n\nexport function additiveFormat(entries: any[], num: number): string {\n  const max = entries[0] as number;\n  if (num > max || num <= 0 || num != Math.round(num)) {\n    return \"\";\n  }\n  let result = \"\";\n  for (let i = 1; i < entries.length; i += 2) {\n    const value = entries[i] as number;\n    let count = Math.floor(num / value);\n    if (count > 20) {\n      return \"\";\n    }\n    num -= count * value;\n    while (count > 0) {\n      result += entries[i + 1];\n      count--;\n    }\n  }\n  return result;\n}\n\nexport function expandAlphabet(str: string): string[] | null {\n  const arr = [];\n  let i = 0;\n  while (i < str.length) {\n    if (str.substr(i + 1, 1) == \"-\") {\n      const first = str.charCodeAt(i);\n      const last = str.charCodeAt(i + 2);\n      i += 3;\n      for (let k = first; k <= last; k++) {\n        arr.push(String.fromCharCode(k));\n      }\n    } else {\n      arr.push(str.substr(i++, 1));\n    }\n  }\n  return arr;\n}\n\nexport function alphabeticFormat(alphabetStr: string, num: number): string {\n  if (num <= 0 || num != Math.round(num)) {\n    return \"\";\n  }\n  const alphabet = expandAlphabet(alphabetStr);\n  let result = \"\";\n  do {\n    num--;\n    const digit = num % alphabet.length;\n    result = alphabet[digit] + result;\n    num = (num - digit) / alphabet.length;\n  } while (num > 0);\n  return result;\n}\n\nexport type ChineseNumbering = {\n  digits: string;\n  markers: string;\n  negative: string;\n  formal: boolean;\n};\n\n/**\n * From http://www.w3.org/TR/css3-lists/\n */\nexport const chineseTradInformal: ChineseNumbering = {\n  formal: false,\n  digits: \"\\u96f6\\u4e00\\u4e8c\\u4e09\\u56db\\u4e94\\u516d\\u4e03\\u516b\\u4e5d\",\n  markers: \"\\u5341\\u767e\\u5343\",\n  negative: \"\\u8ca0\",\n};\n\nexport function chineseCounter(\n  num: number,\n  numbering: ChineseNumbering,\n): string {\n  if (num > 9999 || num < -9999) {\n    return `${num}`; // TODO: should be cjk-decimal\n  }\n  if (num == 0) {\n    return numbering.digits.charAt(0);\n  }\n  const res = new Base.StringBuffer();\n  if (num < 0) {\n    res.append(numbering.negative);\n    num = -num;\n  }\n  if (num < 10) {\n    res.append(numbering.digits.charAt(num));\n  } else if (!numbering.formal && num <= 19) {\n    res.append(numbering.markers.charAt(0));\n    if (num != 0) {\n      res.append(numbering.digits.charAt(num - 10));\n    }\n  } else {\n    const thousands = Math.floor(num / 1000);\n    if (thousands) {\n      res.append(numbering.digits.charAt(thousands));\n      res.append(numbering.markers.charAt(2));\n    }\n    const hundreds = Math.floor(num / 100) % 10;\n    if (hundreds) {\n      res.append(numbering.digits.charAt(hundreds));\n      res.append(numbering.markers.charAt(1));\n    }\n    const tens = Math.floor(num / 10) % 10;\n    if (tens) {\n      res.append(numbering.digits.charAt(tens));\n      res.append(numbering.markers.charAt(0));\n    }\n    const ones = num % 10;\n    if (ones) {\n      res.append(numbering.digits.charAt(ones));\n    }\n  }\n\n  // res.append(\"\\u3001\");\n  return res.toString();\n}\n\n/**\n * Fitting order and specificity in the same number. Order is recorded in the\n * fractional part. Select value so that\n *\n *   0x7FFFFFFF != 0x7FFFFFFF + ORDER_INCREMENT\n *\n */\nexport const ORDER_INCREMENT = 1 / 1048576;\n\nexport function copyTable(src: ActionTable, dst: ActionTable): void {\n  for (const n in src) {\n    dst[n] = src[n].clone();\n  }\n}\n\nexport class Cascade {\n  nsCount: number = 0;\n  nsPrefix: { [key: string]: string } = {};\n  tags: ActionTable = {};\n  nstags: ActionTable = {};\n  epubtypes: ActionTable = {};\n  classes: ActionTable = {};\n  ids: ActionTable = {};\n  pagetypes: ActionTable = {};\n  order: number = 0;\n\n  clone(): Cascade {\n    const r = new Cascade();\n    r.nsCount = this.nsCount;\n    for (const p in this.nsPrefix) {\n      r.nsPrefix[p] = this.nsPrefix[p];\n    }\n    copyTable(this.tags, r.tags);\n    copyTable(this.nstags, r.nstags);\n    copyTable(this.epubtypes, r.epubtypes);\n    copyTable(this.classes, r.classes);\n    copyTable(this.ids, r.ids);\n    copyTable(this.pagetypes, r.pagetypes);\n    r.order = this.order;\n    return r;\n  }\n\n  insertInTable(table: ActionTable, key: string, action: CascadeAction): void {\n    const a = table[key];\n    if (a) {\n      action = a.mergeWith(action);\n    }\n    table[key] = action;\n  }\n\n  createInstance(\n    context: Exprs.Context,\n    counterListener: CounterListener,\n    counterResolver: CounterResolver,\n    lang,\n  ): CascadeInstance {\n    return new CascadeInstance(\n      this,\n      context,\n      counterListener,\n      counterResolver,\n      lang,\n    );\n  }\n\n  nextOrder(): number {\n    return (this.order += ORDER_INCREMENT);\n  }\n}\n\nexport class CascadeInstance {\n  code: Cascade;\n  stack = [[], []] as ConditionItem[][];\n  conditions = {} as { [key: string]: number };\n  currentElement: Element | null = null;\n  currentElementOffset: number | null = null;\n  currentStyle: ElementStyle | null = null;\n  currentClassNames: string[] | null = null;\n  currentLocalName: string = \"\";\n  currentNamespace: string = \"\";\n  currentId: string = \"\";\n  currentXmlId: string = \"\";\n  currentNSTag: string = \"\";\n  currentEpubTypes: string[] | null = null;\n  currentPageType: string | null = null;\n  isFirst: boolean = true;\n  isRoot: boolean = true;\n  counters: { [key: string]: number[] } = {};\n  counterScoping: { [key: string]: boolean }[] = [{}];\n  quotes: Css.Str[];\n  quoteDepth: number = 0;\n  lang: string = \"\";\n  siblingOrderStack: number[] = [0];\n  currentSiblingOrder: number = 0;\n  siblingTypeCountsStack: { [key: string]: { [key: string]: number } }[] = [{}];\n  currentSiblingTypeCounts: { [key: string]: { [key: string]: number } };\n  currentFollowingSiblingOrder: number | null = null;\n  followingSiblingOrderStack: (number | null)[];\n  followingSiblingTypeCountsStack: {\n    [key: string]: { [key: string]: number };\n  }[] = [{}];\n  currentFollowingSiblingTypeCounts: {\n    [key: string]: { [key: string]: number };\n  };\n  viewConditions: { [key: string]: Matchers.Matcher[] } = {};\n  dependentConditions: string[] = [];\n  elementStack: Element[];\n  currentDoc?: Document | null;\n\n  constructor(\n    cascade: Cascade,\n    public readonly context: Exprs.Context,\n    public readonly counterListener: CounterListener,\n    public readonly counterResolver: CounterResolver,\n    lang: string,\n  ) {\n    this.code = cascade;\n    this.quotes = [\n      new Css.Str(\"\\u201c\"),\n      new Css.Str(\"\\u201d\"),\n      new Css.Str(\"\\u2018\"),\n      new Css.Str(\"\\u2019\"),\n    ];\n    this.currentSiblingTypeCounts = this.siblingTypeCountsStack[0];\n    this.followingSiblingOrderStack = [this.currentFollowingSiblingOrder];\n    this.currentFollowingSiblingTypeCounts = this.siblingTypeCountsStack[0];\n    if (VIVLIOSTYLE_DEBUG) {\n      this.elementStack = [];\n    }\n  }\n\n  pushConditionItem(item: ConditionItem): void {\n    this.stack[this.stack.length - 1].push(item);\n  }\n\n  increment(condition: string, viewCondition: Matchers.Matcher): void {\n    this.conditions[condition] = (this.conditions[condition] || 0) + 1;\n    if (!viewCondition) {\n      return;\n    }\n    if (this.viewConditions[condition]) {\n      this.viewConditions[condition].push(viewCondition);\n    } else {\n      this.viewConditions[condition] = [viewCondition];\n    }\n  }\n\n  decrement(condition: string, viewCondition: Matchers.Matcher): void {\n    this.conditions[condition]--;\n    if (!this.viewConditions[condition]) {\n      return;\n    }\n    this.viewConditions[condition] = this.viewConditions[condition].filter(\n      (item) => item !== viewCondition,\n    );\n    if (this.viewConditions[condition].length === 0) {\n      delete this.viewConditions[condition];\n    }\n  }\n\n  buildViewConditionMatcher(viewConditionId: string | null): Matchers.Matcher {\n    let matcher: Matchers.Matcher = null;\n    if (viewConditionId) {\n      Asserts.assert(this.currentElementOffset);\n      matcher = Matchers.MatcherBuilder.buildViewConditionMatcher(\n        this.currentElementOffset,\n        viewConditionId,\n      );\n    }\n    const dependentConditionMatchers = this.dependentConditions\n      .map((conditionId) => {\n        const conditions = this.viewConditions[conditionId];\n        if (conditions && conditions.length > 0) {\n          return conditions.length === 1\n            ? conditions[0]\n            : Matchers.MatcherBuilder.buildAnyMatcher([].concat(conditions));\n        } else {\n          return null;\n        }\n      })\n      .filter((item) => item);\n    if (dependentConditionMatchers.length <= 0) {\n      return matcher;\n    }\n    if (matcher === null) {\n      return dependentConditionMatchers.length === 1\n        ? dependentConditionMatchers[0]\n        : Matchers.MatcherBuilder.buildAllMatcher(dependentConditionMatchers);\n    }\n    return Matchers.MatcherBuilder.buildAllMatcher(\n      [matcher].concat(dependentConditionMatchers),\n    );\n  }\n\n  applyAction(table: ActionTable, key: string): void {\n    const action = table[key];\n    if (action) {\n      action.apply(this);\n    }\n  }\n\n  pushRule(\n    classes: string[],\n    pageType: string | null,\n    baseStyle: ElementStyle,\n  ): void {\n    this.currentElement = null;\n    this.currentElementOffset = null;\n    this.currentStyle = baseStyle;\n    this.currentNamespace = \"\";\n    this.currentLocalName = \"\";\n    this.currentId = \"\";\n    this.currentXmlId = \"\";\n    this.currentClassNames = classes;\n    this.currentNSTag = \"\";\n    this.currentEpubTypes = EMPTY;\n    this.currentPageType = pageType;\n    this.applyActions();\n  }\n\n  defineCounter(counterName: string, value: number) {\n    if (this.counters[counterName]) {\n      this.counters[counterName].push(value);\n    } else {\n      this.counters[counterName] = [value];\n    }\n    let scoping = this.counterScoping[this.counterScoping.length - 1];\n    if (!scoping) {\n      scoping = {};\n      this.counterScoping[this.counterScoping.length - 1] = scoping;\n    }\n    scoping[counterName] = true;\n  }\n\n  pushCounters(props: ElementStyle): void {\n    let displayVal = Css.ident.inline;\n    const display = props[\"display\"];\n    if (display) {\n      displayVal = display.evaluate(this.context);\n    }\n    let resetMap: { [key: string]: number } = null;\n    let incrementMap: { [key: string]: number } = null;\n    let setMap: { [key: string]: number } = null;\n    const reset = props[\"counter-reset\"];\n    if (reset) {\n      const resetVal = reset.evaluate(this.context);\n      if (resetVal) {\n        resetMap = CssProp.toCounters(resetVal, true);\n      }\n    }\n    const set = props[\"counter-set\"];\n    if (set) {\n      const setVal = set.evaluate(this.context);\n      if (setVal) {\n        setMap = CssProp.toCounters(setVal, false);\n      }\n    }\n    const increment = props[\"counter-increment\"];\n    if (increment) {\n      const incrementVal = increment.evaluate(this.context);\n      if (incrementVal) {\n        incrementMap = CssProp.toCounters(incrementVal, false);\n      }\n    }\n    if (\n      (this.currentLocalName == \"ol\" || this.currentLocalName == \"ul\") &&\n      this.currentNamespace == Base.NS.XHTML\n    ) {\n      if (!resetMap) {\n        resetMap = {};\n      }\n      resetMap[\"ua-list-item\"] = 0;\n    }\n    if (displayVal === Css.ident.list_item) {\n      if (!incrementMap) {\n        incrementMap = {};\n      }\n      incrementMap[\"ua-list-item\"] = 1;\n    }\n    if (resetMap) {\n      for (const resetCounterName in resetMap) {\n        this.defineCounter(resetCounterName, resetMap[resetCounterName]);\n      }\n    }\n    if (setMap) {\n      for (const setCounterName in setMap) {\n        if (!this.counters[setCounterName]) {\n          this.defineCounter(setCounterName, setMap[setCounterName]);\n        } else {\n          const counterValues = this.counters[setCounterName];\n          counterValues[counterValues.length - 1] = setMap[setCounterName];\n        }\n      }\n    }\n    if (incrementMap) {\n      for (const incrementCounterName in incrementMap) {\n        if (!this.counters[incrementCounterName]) {\n          this.defineCounter(incrementCounterName, 0);\n        }\n        const counterValues = this.counters[incrementCounterName];\n        counterValues[counterValues.length - 1] +=\n          incrementMap[incrementCounterName];\n      }\n    }\n    if (displayVal === Css.ident.list_item) {\n      const listItemCounts = this.counters[\"ua-list-item\"];\n      const listItemCount = listItemCounts[listItemCounts.length - 1];\n      props[\"ua-list-item-count\"] = new CascadeValue(\n        new Css.Num(listItemCount),\n        0,\n      );\n    }\n    this.counterScoping.push(null);\n  }\n\n  popCounters(): void {\n    const scoping = this.counterScoping.pop();\n    if (scoping) {\n      for (const counterName in scoping) {\n        const arr = this.counters[counterName];\n        if (arr) {\n          if (arr.length == 1) {\n            delete this.counters[counterName];\n          } else {\n            arr.pop();\n          }\n        }\n      }\n    }\n  }\n\n  processPseudoelementProps(pseudoprops: ElementStyle, element: Element): void {\n    this.pushCounters(pseudoprops);\n    if (pseudoprops[\"content\"]) {\n      pseudoprops[\"content\"] = pseudoprops[\"content\"].filterValue(\n        new ContentPropVisitor(this, element, this.counterResolver),\n      );\n    }\n    this.popCounters();\n  }\n\n  pushElement(\n    element: Element,\n    baseStyle: ElementStyle,\n    elementOffset: number,\n  ): void {\n    if (VIVLIOSTYLE_DEBUG) {\n      this.elementStack.push(element);\n    }\n\n    // do not apply page rules\n    this.currentPageType = null;\n    this.currentElement = element;\n    this.currentElementOffset = elementOffset;\n    this.currentStyle = baseStyle;\n    this.currentNamespace = element.namespaceURI;\n    this.currentLocalName = element.localName;\n    const prefix = this.code.nsPrefix[this.currentNamespace];\n    if (prefix) {\n      this.currentNSTag = prefix + this.currentLocalName;\n    } else {\n      this.currentNSTag = \"\";\n    }\n    this.currentId = element.getAttribute(\"id\");\n    this.currentXmlId = element.getAttributeNS(Base.NS.XML, \"id\");\n    const classes = element.getAttribute(\"class\");\n    if (classes) {\n      this.currentClassNames = classes.split(/\\s+/);\n    } else {\n      this.currentClassNames = EMPTY;\n    }\n    const types = element.getAttributeNS(Base.NS.epub, \"type\");\n    if (types) {\n      this.currentEpubTypes = types.split(/\\s+/);\n    } else {\n      this.currentEpubTypes = EMPTY;\n    }\n    if (\n      this.currentLocalName == \"style\" &&\n      this.currentNamespace == Base.NS.FB2\n    ) {\n      // special case\n      const className = element.getAttribute(\"name\") || \"\";\n      this.currentClassNames = [className];\n    }\n    const lang = Base.getLangAttribute(element);\n    if (lang) {\n      this.stack[this.stack.length - 1].push(new RestoreLangItem(this.lang));\n      this.lang = lang.toLowerCase();\n    }\n    const isRoot = this.isRoot;\n    const siblingOrderStack = this.siblingOrderStack;\n    this.currentSiblingOrder = ++siblingOrderStack[\n      siblingOrderStack.length - 1\n    ];\n    siblingOrderStack.push(0);\n    const siblingTypeCountsStack = this.siblingTypeCountsStack;\n    const currentSiblingTypeCounts = (this.currentSiblingTypeCounts =\n      siblingTypeCountsStack[siblingTypeCountsStack.length - 1]);\n    let currentNamespaceTypeCounts =\n      currentSiblingTypeCounts[this.currentNamespace];\n    if (!currentNamespaceTypeCounts) {\n      currentNamespaceTypeCounts = currentSiblingTypeCounts[\n        this.currentNamespace\n      ] = {};\n    }\n    currentNamespaceTypeCounts[this.currentLocalName] =\n      (currentNamespaceTypeCounts[this.currentLocalName] || 0) + 1;\n    siblingTypeCountsStack.push({});\n    const followingSiblingOrderStack = this.followingSiblingOrderStack;\n    if (\n      followingSiblingOrderStack[followingSiblingOrderStack.length - 1] !== null\n    ) {\n      this.currentFollowingSiblingOrder = --followingSiblingOrderStack[\n        followingSiblingOrderStack.length - 1\n      ];\n    } else {\n      this.currentFollowingSiblingOrder = null;\n    }\n    followingSiblingOrderStack.push(null);\n    const followingSiblingTypeCountsStack = this\n      .followingSiblingTypeCountsStack;\n    const currentFollowingSiblingTypeCounts = (this.currentFollowingSiblingTypeCounts =\n      followingSiblingTypeCountsStack[\n        followingSiblingTypeCountsStack.length - 1\n      ]);\n    if (\n      currentFollowingSiblingTypeCounts &&\n      currentFollowingSiblingTypeCounts[this.currentNamespace]\n    ) {\n      currentFollowingSiblingTypeCounts[this.currentNamespace][\n        this.currentLocalName\n      ]--;\n    }\n    followingSiblingTypeCountsStack.push({});\n    this.applyActions();\n    this.applyAttrFilter(element);\n    const quotesCasc = baseStyle[\"quotes\"];\n    let itemToPushLast: QuotesScopeItem | null = null;\n    if (quotesCasc) {\n      const quotesVal = quotesCasc.evaluate(this.context);\n      if (quotesVal) {\n        itemToPushLast = new QuotesScopeItem(this.quotes);\n        if (quotesVal === Css.ident.none) {\n          this.quotes = [new Css.Str(\"\"), new Css.Str(\"\")];\n        } else if (quotesVal instanceof Css.SpaceList) {\n          this.quotes = (quotesVal as Css.SpaceList).values as Css.Str[];\n        }\n      }\n    }\n    this.pushCounters(this.currentStyle);\n    const id =\n      this.currentId || this.currentXmlId || element.getAttribute(\"name\") || \"\";\n    if (isRoot || id) {\n      const counters: { [key: string]: number[] } = {};\n      Object.keys(this.counters).forEach((name) => {\n        counters[name] = Array.from(this.counters[name]);\n      });\n      this.counterListener.countersOfId(id, counters);\n    }\n    const pseudos = getStyleMap(this.currentStyle, \"_pseudos\");\n    if (pseudos) {\n      let before = true;\n      for (const pseudoName of pseudoNames) {\n        if (!pseudoName) {\n          // content\n          before = false;\n        }\n        const pseudoProps = pseudos[pseudoName];\n        if (pseudoProps) {\n          if (before) {\n            this.processPseudoelementProps(pseudoProps, element);\n          } else {\n            this.stack[this.stack.length - 2].push(\n              new AfterPseudoelementItem(pseudoProps, element),\n            );\n          }\n        }\n      }\n    }\n    if (itemToPushLast) {\n      this.stack[this.stack.length - 2].push(itemToPushLast);\n    }\n  }\n\n  private applyAttrFilterInner(visitor, elementStyle): void {\n    for (const propName in elementStyle) {\n      if (isPropName(propName)) {\n        elementStyle[propName] = elementStyle[propName].filterValue(visitor);\n      }\n    }\n  }\n\n  private applyAttrFilter(element): void {\n    const visitor = new AttrValueFilterVisitor(element);\n    const currentStyle = this.currentStyle;\n    const pseudoMap = getStyleMap(currentStyle, \"_pseudos\");\n    for (const pseudoName in pseudoMap) {\n      this.applyAttrFilterInner(visitor, pseudoMap[pseudoName]);\n    }\n    this.applyAttrFilterInner(visitor, currentStyle);\n  }\n\n  private applyActions(): void {\n    let i: number;\n    for (i = 0; i < this.currentClassNames.length; i++) {\n      this.applyAction(this.code.classes, this.currentClassNames[i]);\n    }\n    for (i = 0; i < this.currentEpubTypes.length; i++) {\n      this.applyAction(this.code.epubtypes, this.currentEpubTypes[i]);\n    }\n    this.applyAction(this.code.ids, this.currentId);\n    this.applyAction(this.code.tags, this.currentLocalName);\n    if (this.currentLocalName != \"\") {\n      // Universal selector does not apply to page-master-related rules.\n      this.applyAction(this.code.tags, \"*\");\n    }\n    this.applyAction(this.code.nstags, this.currentNSTag);\n\n    // Apply page rules only when currentPageType is not null\n    if (this.currentPageType !== null) {\n      this.applyAction(this.code.pagetypes, this.currentPageType);\n\n      // We represent page rules without selectors by *, though it is illegal in\n      // CSS\n      this.applyAction(this.code.pagetypes, \"*\");\n    }\n    this.currentElement = null;\n    this.currentDoc = null;\n    this.stack.push([]);\n    for (let depth = 1; depth >= -1; --depth) {\n      const list = this.stack[this.stack.length - depth - 2];\n      i = 0;\n      while (i < list.length) {\n        if (list[i].push(this, depth)) {\n          // done\n          list.splice(i, 1);\n        } else {\n          i++;\n        }\n      }\n    }\n    this.isFirst = true;\n    this.isRoot = false;\n  }\n\n  private pop(): void {\n    for (let depth = 1; depth >= -1; --depth) {\n      const list = this.stack[this.stack.length - depth - 2];\n      let i = 0;\n      while (i < list.length) {\n        if (list[i].pop(this, depth)) {\n          // done\n          list.splice(i, 1);\n        } else {\n          i++;\n        }\n      }\n    }\n    this.stack.pop();\n    this.isFirst = false;\n  }\n\n  popRule(): void {\n    this.pop();\n  }\n\n  popElement(element: Element): void {\n    if (VIVLIOSTYLE_DEBUG) {\n      const e = this.elementStack.pop();\n      if (e !== element) {\n        throw new Error(\"Invalid call to popElement\");\n      }\n    }\n    this.siblingOrderStack.pop();\n    this.siblingTypeCountsStack.pop();\n    this.followingSiblingOrderStack.pop();\n    this.followingSiblingTypeCountsStack.pop();\n    this.pop();\n    this.popCounters();\n  }\n}\n\nexport const EMPTY = [];\n\n/**\n * Pseudoelement names in the order they should be processed, empty string is\n * the place where the element's DOM children are processed.\n */\nexport const pseudoNames = [\n  \"before\",\n  \"transclusion-before\",\n  \"footnote-call\",\n  \"footnote-marker\",\n  \"inner\",\n  \"first-letter\",\n  \"first-line\",\n  \"\",\n  /* content */\n  \"transclusion-after\",\n  \"after\",\n];\n\n/**\n * @enum {number}\n */\nexport enum ParseState {\n  TOP,\n  SELECTOR,\n  RULE,\n}\n\n/**\n * Cascade for base User Agent stylesheet.\n */\nexport let uaBaseCascade: Cascade = null;\nexport function setUABaseCascade(value: Cascade): void {\n  uaBaseCascade = value;\n}\n\n//------------- parsing ------------\nexport class CascadeParserHandler extends CssParser.SlaveParserHandler\n  implements CssValidator.PropertyReceiver {\n  chain: ChainedAction[] = null;\n  specificity: number = 0;\n  elementStyle: ElementStyle = null;\n  conditionCount: number = 0;\n  pseudoelement: string | null = null;\n  footnoteContent: boolean = false;\n  cascade: Cascade;\n  state: ParseState;\n  viewConditionId: string | null = null;\n  insideSelectorRule: ParseState;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    public readonly condition: Exprs.Val,\n    parent: CascadeParserHandler,\n    public readonly regionId: string | null,\n    public readonly validatorSet: CssValidator.ValidatorSet,\n    topLevel: boolean,\n  ) {\n    super(scope, owner, topLevel);\n    this.cascade = parent\n      ? parent.cascade\n      : uaBaseCascade\n      ? uaBaseCascade.clone()\n      : new Cascade();\n    this.state = ParseState.TOP;\n  }\n\n  protected insertNonPrimary(action: CascadeAction): void {\n    this.cascade.insertInTable(this.cascade.tags, \"*\", action);\n  }\n\n  processChain(action: CascadeAction): void {\n    const chained = chainActions(this.chain, action);\n    if (\n      chained !== action &&\n      (chained as ChainedAction).makePrimary(this.cascade)\n    ) {\n      return;\n    }\n    this.insertNonPrimary(chained);\n  }\n\n  isInsideSelectorRule(mnemonics: string): boolean {\n    if (this.state != ParseState.TOP) {\n      this.reportAndSkip(mnemonics);\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  tagSelector(ns: string | null, name: string | null): void {\n    if (!name && !ns) {\n      return;\n    }\n    this.specificity += 1;\n    if (name && ns) {\n      this.chain.push(new CheckNSTagAction(ns, name.toLowerCase()));\n    } else if (name) {\n      this.chain.push(new CheckLocalNameAction(name.toLowerCase()));\n    } else {\n      this.chain.push(new CheckNamespaceAction(ns as string));\n    }\n  }\n\n  /**\n   * @override\n   */\n  classSelector(name: string): void {\n    if (this.pseudoelement) {\n      Logging.logger.warn(`::${this.pseudoelement}`, `followed by .${name}`);\n      this.chain.push(new CheckConditionAction(\"\")); // always fails\n      return;\n    }\n    this.specificity += 256;\n    this.chain.push(new CheckClassAction(name));\n  }\n\n  /**\n   * @override\n   */\n  pseudoclassSelector(name: string, params: (number | string)[]): void {\n    if (this.pseudoelement) {\n      Logging.logger.warn(`::${this.pseudoelement}`, `followed by :${name}`);\n      this.chain.push(new CheckConditionAction(\"\")); // always fails\n      return;\n    }\n    switch (name.toLowerCase()) {\n      case \"enabled\":\n        this.chain.push(new IsEnabledAction());\n        break;\n      case \"disabled\":\n        this.chain.push(new IsDisabledAction());\n        break;\n      case \"checked\":\n        this.chain.push(new IsCheckedAction());\n        break;\n      case \"root\":\n        this.chain.push(new IsRootAction());\n        break;\n      case \"link\":\n        this.chain.push(new CheckLocalNameAction(\"a\"));\n        this.chain.push(new CheckAttributePresentAction(\"\", \"href\"));\n        break;\n      case \"-adapt-href-epub-type\":\n      case \"href-epub-type\":\n        if (params && params.length == 1 && typeof params[0] == \"string\") {\n          const value = params[0] as string;\n          const patt = new RegExp(`(^|s)${Base.escapeRegExp(value)}(\\$|s)`);\n          this.chain.push(new CheckTargetEpubTypeAction(patt));\n        } else {\n          this.chain.push(new CheckConditionAction(\"\")); // always fails\n        }\n        break;\n      case \"-adapt-footnote-content\":\n      case \"footnote-content\":\n        // content inside the footnote\n        this.footnoteContent = true;\n        break;\n      case \"visited\":\n      case \"active\":\n      case \"hover\":\n      case \"focus\":\n        this.chain.push(new CheckConditionAction(\"\")); // always fails\n        break;\n      case \"lang\":\n        if (params && params.length == 1 && typeof params[0] == \"string\") {\n          const langValue = params[0] as string;\n          this.chain.push(\n            new CheckLangAction(\n              new RegExp(\n                `^${Base.escapeRegExp(langValue.toLowerCase())}(\\$|-)`,\n              ),\n            ),\n          );\n        } else {\n          this.chain.push(new CheckConditionAction(\"\")); // always fais\n        }\n        break;\n      case \"nth-child\":\n      case \"nth-last-child\":\n      case \"nth-of-type\":\n      case \"nth-last-of-type\": {\n        const ActionClass = nthSelectorActionClasses[name.toLowerCase()];\n        if (params && params.length == 2) {\n          this.chain.push(\n            new ActionClass(params[0] as number, params[1] as number),\n          );\n        } else {\n          this.chain.push(new CheckConditionAction(\"\")); // always fails\n        }\n        break;\n      }\n      case \"first-child\":\n        this.chain.push(new IsFirstAction());\n        break;\n      case \"last-child\":\n        this.chain.push(new IsNthLastSiblingAction(0, 1));\n        break;\n      case \"first-of-type\":\n        this.chain.push(new IsNthSiblingOfTypeAction(0, 1));\n        break;\n      case \"last-of-type\":\n        this.chain.push(new IsNthLastSiblingOfTypeAction(0, 1));\n        break;\n      case \"only-child\":\n        this.chain.push(new IsFirstAction());\n        this.chain.push(new IsNthLastSiblingAction(0, 1));\n        break;\n      case \"only-of-type\":\n        this.chain.push(new IsNthSiblingOfTypeAction(0, 1));\n        this.chain.push(new IsNthLastSiblingOfTypeAction(0, 1));\n        break;\n      case \"empty\":\n        this.chain.push(new IsEmptyAction());\n        break;\n      case \"before\":\n      case \"after\":\n      case \"first-line\":\n      case \"first-letter\":\n        this.pseudoelementSelector(name, params);\n        return;\n      default:\n        Logging.logger.warn(`unknown pseudo-class selector: ${name}`);\n        this.chain.push(new CheckConditionAction(\"\")); // always fails\n        break;\n    }\n    this.specificity += 256;\n  }\n\n  /**\n   * @override\n   */\n  pseudoelementSelector(name: string, params: (number | string)[]): void {\n    switch (name) {\n      case \"before\":\n      case \"after\":\n      case \"first-line\":\n      case \"first-letter\":\n      case \"footnote-call\":\n      case \"footnote-marker\":\n      case \"inner\":\n      case \"after-if-continues\":\n        if (!this.pseudoelement) {\n          this.pseudoelement = name;\n        } else {\n          Logging.logger.warn(\n            `Double pseudoelement ::${this.pseudoelement}::${name}`,\n          );\n          this.chain.push(new CheckConditionAction(\"\")); // always fails\n        }\n        break;\n      case \"first-n-lines\":\n        if (params && params.length == 1 && typeof params[0] == \"number\") {\n          const n = Math.round(params[0] as number);\n          if (n > 0 && n == params[0]) {\n            if (!this.pseudoelement) {\n              this.pseudoelement = `first-${n}-lines`;\n            } else {\n              Logging.logger.warn(\n                `Double pseudoelement ::${this.pseudoelement}::${name}`,\n              );\n              this.chain.push(new CheckConditionAction(\"\")); // always fails\n            }\n            break;\n          }\n        }\n        this.chain.push(new CheckConditionAction(\"\")); // always fails\n        break;\n      case \"nth-fragment\":\n        if (params && params.length == 2) {\n          this.viewConditionId = `NFS_${params[0]}_${params[1]}`;\n        } else {\n          this.chain.push(new CheckConditionAction(\"\")); // always fails\n        }\n        break;\n      default:\n        Logging.logger.warn(`Unrecognized pseudoelement: ::${name}`);\n        this.chain.push(new CheckConditionAction(\"\")); // always fails\n        break;\n    }\n    this.specificity += 1;\n  }\n\n  /**\n   * @override\n   */\n  idSelector(id: string): void {\n    this.specificity += 65536;\n    this.chain.push(new CheckIdAction(id));\n  }\n\n  /**\n   * @override\n   */\n  attributeSelector(\n    ns: string,\n    name: string,\n    op: CssTokenizer.TokenType,\n    value: string | null,\n  ): void {\n    this.specificity += 256;\n    name = name.toLowerCase();\n    value = value || \"\";\n    let action;\n    switch (op) {\n      case CssTokenizer.TokenType.EOF:\n        action = new CheckAttributePresentAction(ns, name);\n        break;\n      case CssTokenizer.TokenType.EQ:\n        action = new CheckAttributeEqAction(ns, name, value);\n        break;\n      case CssTokenizer.TokenType.TILDE_EQ:\n        if (!value || value.match(/\\s/)) {\n          action = new CheckConditionAction(\"\"); // always fails\n        } else {\n          action = new CheckAttributeRegExpAction(\n            ns,\n            name,\n            new RegExp(`(^|\\\\s)${Base.escapeRegExp(value)}(\\$|\\\\s)`),\n          );\n        }\n        break;\n      case CssTokenizer.TokenType.BAR_EQ:\n        action = new CheckAttributeRegExpAction(\n          ns,\n          name,\n          new RegExp(`^${Base.escapeRegExp(value)}(\\$|-)`),\n        );\n        break;\n      case CssTokenizer.TokenType.HAT_EQ:\n        if (!value) {\n          action = new CheckConditionAction(\"\"); // always fails\n        } else {\n          action = new CheckAttributeRegExpAction(\n            ns,\n            name,\n            new RegExp(`^${Base.escapeRegExp(value)}`),\n          );\n        }\n        break;\n      case CssTokenizer.TokenType.DOLLAR_EQ:\n        if (!value) {\n          action = new CheckConditionAction(\"\"); // always fails\n        } else {\n          action = new CheckAttributeRegExpAction(\n            ns,\n            name,\n            new RegExp(`${Base.escapeRegExp(value)}\\$`),\n          );\n        }\n        break;\n      case CssTokenizer.TokenType.STAR_EQ:\n        if (!value) {\n          action = new CheckConditionAction(\"\"); // always fails\n        } else {\n          action = new CheckAttributeRegExpAction(\n            ns,\n            name,\n            new RegExp(Base.escapeRegExp(value)),\n          );\n        }\n        break;\n      case CssTokenizer.TokenType.COL_COL:\n        if (value == \"supported\") {\n          action = new CheckNamespaceSupportedAction(ns, name);\n        } else {\n          Logging.logger.warn(\"Unsupported :: attr selector op:\", value);\n          action = new CheckConditionAction(\"\"); // always fails\n        }\n        break;\n      default:\n        Logging.logger.warn(\"Unsupported attr selector:\", op);\n        action = new CheckConditionAction(\"\"); // always fails\n    }\n    this.chain.push(action);\n  }\n\n  /**\n   * @override\n   */\n  descendantSelector(): void {\n    const condition = `d${conditionCount++}`;\n    this.processChain(\n      new ConditionItemAction(\n        new DescendantConditionItem(condition, this.viewConditionId, null),\n      ),\n    );\n    this.chain = [new CheckConditionAction(condition)];\n    this.viewConditionId = null;\n  }\n\n  /**\n   * @override\n   */\n  childSelector(): void {\n    const condition = `c${conditionCount++}`;\n    this.processChain(\n      new ConditionItemAction(\n        new ChildConditionItem(condition, this.viewConditionId, null),\n      ),\n    );\n    this.chain = [new CheckConditionAction(condition)];\n    this.viewConditionId = null;\n  }\n\n  /**\n   * @override\n   */\n  adjacentSiblingSelector(): void {\n    const condition = `a${conditionCount++}`;\n    this.processChain(\n      new ConditionItemAction(\n        new AdjacentSiblingConditionItem(condition, this.viewConditionId, null),\n      ),\n    );\n    this.chain = [new CheckConditionAction(condition)];\n    this.viewConditionId = null;\n  }\n\n  /**\n   * @override\n   */\n  followingSiblingSelector(): void {\n    const condition = `f${conditionCount++}`;\n    this.processChain(\n      new ConditionItemAction(\n        new FollowingSiblingConditionItem(\n          condition,\n          this.viewConditionId,\n          null,\n        ),\n      ),\n    );\n    this.chain = [new CheckConditionAction(condition)];\n    this.viewConditionId = null;\n  }\n\n  /**\n   * @override\n   */\n  nextSelector(): void {\n    this.finishChain();\n    this.pseudoelement = null;\n    this.footnoteContent = false;\n    this.specificity = 0;\n    this.chain = [];\n  }\n\n  /**\n   * @override\n   */\n  startSelectorRule(): void {\n    if (this.isInsideSelectorRule(\"E_CSS_UNEXPECTED_SELECTOR\")) {\n      return;\n    }\n    this.state = ParseState.SELECTOR;\n    this.elementStyle = {} as ElementStyle;\n    this.pseudoelement = null;\n    this.specificity = 0;\n    this.footnoteContent = false;\n    this.chain = [];\n  }\n\n  /**\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    super.error(mnemonics, token);\n    if (this.state == ParseState.SELECTOR) {\n      this.state = ParseState.TOP;\n    }\n  }\n\n  /**\n   * @override\n   */\n  startStylesheet(flavor: CssParser.StylesheetFlavor): void {\n    super.startStylesheet(flavor);\n    this.state = ParseState.TOP;\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    this.finishChain();\n    super.startRuleBody();\n    if (this.state == ParseState.SELECTOR) {\n      this.state = ParseState.TOP;\n    }\n  }\n\n  /**\n   * @override\n   */\n  endRule(): void {\n    super.endRule();\n    this.insideSelectorRule = ParseState.TOP;\n  }\n\n  finishChain(): void {\n    if (this.chain) {\n      const specificity: number = this.specificity + this.cascade.nextOrder();\n      this.processChain(this.makeApplyRuleAction(specificity));\n      this.chain = null;\n      this.pseudoelement = null;\n      this.viewConditionId = null;\n      this.footnoteContent = false;\n      this.specificity = 0;\n    }\n  }\n\n  protected makeApplyRuleAction(specificity: number): ApplyRuleAction {\n    let regionId = this.regionId;\n    if (this.footnoteContent) {\n      if (regionId) {\n        regionId = \"xxx-bogus-xxx\";\n      } else {\n        regionId = \"footnote\";\n      }\n    }\n    return new ApplyRuleAction(\n      this.elementStyle,\n      specificity,\n      this.pseudoelement,\n      regionId,\n      this.viewConditionId,\n    );\n  }\n\n  special(name: string, value: Css.Val) {\n    let val: CascadeValue;\n    if (!this.condition) {\n      val = new CascadeValue(value, 0);\n    } else {\n      val = new ConditionalCascadeValue(value, 0, this.condition);\n    }\n    const arr = getMutableSpecial(this.elementStyle, name);\n    arr.push(val);\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.validatorSet.validatePropertyAndHandleShorthand(\n      name,\n      value,\n      important,\n      this,\n    );\n  }\n\n  /**\n   * @override\n   */\n  invalidPropertyValue(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY_VALUE ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  unknownProperty(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    if (\n      name == \"display\" &&\n      (value === Css.ident.oeb_page_head || value === Css.ident.oeb_page_foot)\n    ) {\n      this.simpleProperty(\n        \"flow-options\",\n        new Css.SpaceList([Css.ident.exclusive, Css.ident._static]),\n        important,\n      );\n      this.simpleProperty(\"flow-into\", value, important);\n      value = Css.ident.block;\n    }\n    const hooks = Plugin.getHooksForName(\"SIMPLE_PROPERTY\");\n    hooks.forEach((hook) => {\n      const original = { name: name, value: value, important: important };\n      const converted = hook(original);\n      name = converted[\"name\"];\n      value = converted[\"value\"];\n      important = converted[\"important\"];\n    });\n    const specificity = important\n      ? this.getImportantSpecificity()\n      : this.getBaseSpecificity();\n    const cascval = this.condition\n      ? new ConditionalCascadeValue(value, specificity, this.condition)\n      : new CascadeValue(value, specificity);\n    setProp(this.elementStyle, name, cascval);\n  }\n\n  finish(): Cascade {\n    return this.cascade;\n  }\n\n  /**\n   * @override\n   */\n  startFuncWithSelector(funcName: string): void {\n    switch (funcName) {\n      case \"not\": {\n        const notParserHandler = new NotParameterParserHandler(this);\n        notParserHandler.startSelectorRule();\n        this.owner.pushHandler(notParserHandler);\n        break;\n      }\n      default:\n        // TODO\n        break;\n    }\n  }\n}\n\nexport const nthSelectorActionClasses: { [key: string]: typeof IsNthAction } = {\n  \"nth-child\": IsNthSiblingAction,\n  \"nth-of-type\": IsNthSiblingOfTypeAction,\n  \"nth-last-child\": IsNthLastSiblingAction,\n  \"nth-last-of-type\": IsNthLastSiblingOfTypeAction,\n};\n\nexport let conditionCount: number = 0;\n\nexport class NotParameterParserHandler extends CascadeParserHandler {\n  parentChain: ChainedAction[];\n\n  constructor(public readonly parent: CascadeParserHandler) {\n    super(\n      parent.scope,\n      parent.owner,\n      parent.condition,\n      parent,\n      parent.regionId,\n      parent.validatorSet,\n      false,\n    );\n    this.parentChain = parent.chain;\n  }\n\n  /**\n   * @override\n   */\n  startFuncWithSelector(funcName: string): void {\n    if (funcName == \"not\") {\n      this.reportAndSkip(\"E_CSS_UNEXPECTED_NOT\");\n    }\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_RULE_BODY\");\n  }\n\n  /**\n   * @override\n   */\n  nextSelector(): void {\n    this.reportAndSkip(\"E_CSS_UNEXPECTED_NEXT_SELECTOR\");\n  }\n\n  /**\n   * @override\n   */\n  endFuncWithSelector(): void {\n    if (this.chain && this.chain.length > 0) {\n      this.parentChain.push(new NegateActionsSet(this.chain));\n    }\n    this.parent.specificity += this.specificity;\n    this.owner.popHandler();\n  }\n\n  /**\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    super.error(mnemonics, token);\n    this.owner.popHandler();\n  }\n}\n\n/**\n * @override\n */\nexport class DefineParserHandler extends CssParser.SlaveParserHandler {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n  ) {\n    super(scope, owner, false);\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    if (this.scope.values[name]) {\n      this.error(`E_CSS_NAME_REDEFINED ${name}`, this.getCurrentToken());\n    } else {\n      const unit = name.match(/height|^(top|bottom)$/) ? \"vh\" : \"vw\";\n      const dim = new Exprs.Numeric(this.scope, 100, unit);\n      this.scope.defineName(name, value.toExpr(this.scope, dim));\n    }\n  }\n}\n\nexport class PropSetParserHandler extends CssParser.SlaveParserHandler\n  implements CssValidator.PropertyReceiver {\n  order: number;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    public readonly condition: Exprs.Val,\n    public readonly elementStyle: ElementStyle,\n    public readonly validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope, owner, false);\n    this.order = 0;\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    if (important) {\n      Logging.logger.warn(\"E_IMPORTANT_NOT_ALLOWED\");\n    } else {\n      this.validatorSet.validatePropertyAndHandleShorthand(\n        name,\n        value,\n        important,\n        this,\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  invalidPropertyValue(name: string, value: Css.Val): void {\n    Logging.logger.warn(\n      \"E_INVALID_PROPERTY_VALUE\",\n      `${name}:`,\n      value.toString(),\n    );\n  }\n\n  /**\n   * @override\n   */\n  unknownProperty(name: string, value: Css.Val): void {\n    Logging.logger.warn(\"E_INVALID_PROPERTY\", `${name}:`, value.toString());\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    let specificity = important\n      ? this.getImportantSpecificity()\n      : this.getBaseSpecificity();\n    specificity += this.order;\n    this.order += ORDER_INCREMENT;\n    const av = this.condition\n      ? new ConditionalCascadeValue(value, specificity, this.condition)\n      : new CascadeValue(value, specificity);\n    setProp(this.elementStyle, name, av);\n  }\n}\n\nexport class PropertyParserHandler extends CssParser.ErrorHandler\n  implements CssValidator.PropertyReceiver {\n  elementStyle = {} as ElementStyle;\n  order: number = 0;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    public readonly validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope);\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.validatorSet.validatePropertyAndHandleShorthand(\n      name,\n      value,\n      important,\n      this,\n    );\n  }\n\n  /**\n   * @override\n   */\n  invalidPropertyValue(name: string, value: Css.Val): void {\n    Logging.logger.warn(\n      \"E_INVALID_PROPERTY_VALUE\",\n      `${name}:`,\n      value.toString(),\n    );\n  }\n\n  /**\n   * @override\n   */\n  unknownProperty(name: string, value: Css.Val): void {\n    Logging.logger.warn(\"E_INVALID_PROPERTY\", `${name}:`, value.toString());\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    let specificity = important\n      ? CssParser.SPECIFICITY_STYLE_IMPORTANT\n      : CssParser.SPECIFICITY_STYLE;\n    specificity += this.order;\n    this.order += ORDER_INCREMENT;\n    const cascval = new CascadeValue(value, specificity);\n    setProp(this.elementStyle, name, cascval);\n  }\n}\n\nexport function forEachViewConditionalStyles(\n  style: ElementStyle,\n  callback: (p1: ElementStyle) => any,\n): void {\n  const viewConditionalStyles = getViewConditionalStyleMap(style);\n  if (!viewConditionalStyles) {\n    return;\n  }\n  viewConditionalStyles.forEach((entry) => {\n    if (!entry.matcher.matches()) {\n      return;\n    }\n    callback(entry.styles);\n  });\n}\n\nexport function mergeViewConditionalStyles(\n  cascMap: { [key: string]: CascadeValue },\n  context: Exprs.Context,\n  style: ElementStyle,\n): void {\n  forEachViewConditionalStyles(style, (viewConditionalStyles) => {\n    mergeStyle(cascMap, viewConditionalStyles, context);\n  });\n}\n\nexport function parseStyleAttribute(\n  scope: Exprs.LexicalScope,\n  validatorSet: CssValidator.ValidatorSet,\n  baseURL: string,\n  styleAttrValue: string,\n): ElementStyle {\n  const handler = new PropertyParserHandler(scope, validatorSet);\n  const tokenizer = new CssTokenizer.Tokenizer(styleAttrValue, handler);\n  try {\n    CssParser.parseStyleAttribute(tokenizer, handler, baseURL);\n  } catch (err) {\n    Logging.logger.warn(err, \"Style attribute parse error:\");\n  }\n  return handler.elementStyle;\n}\n\nexport function isVertical(\n  cascaded: { [key: string]: CascadeValue },\n  context: Exprs.Context,\n  vertical: boolean,\n): boolean {\n  const writingModeCasc = cascaded[\"writing-mode\"];\n  if (writingModeCasc) {\n    const writingMode = writingModeCasc.evaluate(context, \"writing-mode\");\n    if (writingMode && writingMode !== Css.ident.inherit) {\n      return writingMode === Css.ident.vertical_rl;\n    }\n  }\n  return vertical;\n}\n\nexport function isRtl(\n  cascaded: { [key: string]: CascadeValue },\n  context: Exprs.Context,\n  rtl: boolean,\n): boolean {\n  const directionCasc = cascaded[\"direction\"];\n  if (directionCasc) {\n    const direction = directionCasc.evaluate(context, \"direction\");\n    if (direction && direction !== Css.ident.inherit) {\n      return direction === Css.ident.rtl;\n    }\n  }\n  return rtl;\n}\n\nexport function flattenCascadedStyle(\n  style: ElementStyle,\n  context: Exprs.Context,\n  regionIds: string[],\n  isFootnote: boolean,\n  nodeContext: Vtree.NodeContext,\n): { [key: string]: CascadeValue } {\n  const cascMap = {} as { [key: string]: CascadeValue };\n  for (const n in style) {\n    if (isPropName(n)) {\n      cascMap[n] = getProp(style, n);\n    }\n  }\n  mergeViewConditionalStyles(cascMap, context, style);\n  forEachStylesInRegion(\n    style,\n    regionIds,\n    isFootnote,\n    (regionId, regionStyle) => {\n      mergeStyle(cascMap, regionStyle, context);\n      mergeViewConditionalStyles(cascMap, context, regionStyle);\n    },\n  );\n  return cascMap;\n}\n\nexport function forEachStylesInRegion(\n  style: ElementStyle,\n  regionIds: string[],\n  isFootnote: boolean,\n  callback: (p1: string, p2: ElementStyle) => any,\n): void {\n  const regions = getStyleMap(style, \"_regions\");\n  if ((regionIds || isFootnote) && regions) {\n    if (isFootnote) {\n      const footnoteRegion = [\"footnote\"];\n      if (!regionIds) {\n        regionIds = footnoteRegion;\n      } else {\n        regionIds = regionIds.concat(footnoteRegion);\n      }\n    }\n    for (const regionId of regionIds) {\n      const regionStyle = regions[regionId];\n      if (regionStyle) {\n        callback(regionId, regionStyle);\n      }\n    }\n  }\n}\n\nexport function mergeStyle(\n  to: { [key: string]: CascadeValue },\n  from: ElementStyle,\n  context: Exprs.Context,\n): void {\n  for (const property in from) {\n    if (isPropName(property)) {\n      const newVal = getProp(from, property);\n      const oldVal = to[property];\n      to[property] = cascadeValues(context, oldVal, newVal as CascadeValue);\n    }\n  }\n}\n\n/**\n * Convert logical properties to physical ones, taking specificity into account.\n * @param src Source properties map\n * @param dest Destination map\n * @param transform If supplied, property values are transformed by this\n *     function before inserted into the destination map. The first parameter is\n *     the property name and the second one is the property value.\n * @template T\n */\nexport const convertToPhysical = <T>(\n  src: { [key: string]: CascadeValue },\n  dest: { [key: string]: T },\n  vertical: boolean,\n  rtl: boolean,\n  transform: (p1: string, p2: CascadeValue) => T,\n) => {\n  const couplingMap = vertical\n    ? rtl\n      ? couplingMapVertRtl\n      : couplingMapVert\n    : rtl\n    ? couplingMapHorRtl\n    : couplingMapHor;\n  for (const propName in src) {\n    if (src.hasOwnProperty(propName)) {\n      const cascVal = src[propName];\n      if (!cascVal) {\n        continue;\n      }\n      const coupledName = couplingMap[propName];\n      let targetName: string;\n      if (coupledName) {\n        const coupledCascVal = src[coupledName];\n        if (coupledCascVal && coupledCascVal.priority > cascVal.priority) {\n          continue;\n        }\n        targetName = geomNames[coupledName] ? coupledName : propName;\n      } else {\n        targetName = propName;\n      }\n      dest[targetName] = transform(propName, cascVal);\n    }\n  }\n};\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssLogicalUtil - Utilities related to CSS Logical Properties and Values https://drafts.csswg.org/css-logical/\n */\ntype ConversionMap = {\n  regexp: RegExp;\n  to: string;\n};\n\nfunction createRegExpMap(\n  valueMaps: {\n    [key: string]: { [key: string]: { logical: string; physical: string }[] };\n  },\n  toPhysical: boolean,\n): { [key: string]: { [key: string]: ConversionMap[] } } {\n  const map = {};\n  Object.keys(valueMaps as object).forEach((writingMode) => {\n    const dest = (map[writingMode] = {});\n    const src = valueMaps[writingMode];\n    Object.keys(src as object).forEach((direction) => {\n      dest[direction] = src[direction].map((p) => {\n        const from = toPhysical ? p.logical : p.physical;\n        const to = toPhysical ? p.physical : p.logical;\n        return { regexp: new RegExp(`(-?)${from}(-?)`), to: `\\$1${to}\\$2` };\n      });\n    });\n  });\n  return map;\n}\n\nfunction convert(\n  value: string,\n  writingMode: string,\n  direction: string | null,\n  maps: { [key: string]: { [key: string]: ConversionMap[] } },\n): string {\n  const maps2 = maps[writingMode];\n  if (!maps2) {\n    throw new Error(`unknown writing-mode: ${writingMode}`);\n  }\n  const map = maps2[direction || \"ltr\"];\n  if (!map) {\n    throw new Error(`unknown direction: ${direction}`);\n  }\n  for (const p of map) {\n    const replaced = value.replace(p.regexp, p.to);\n    if (replaced !== value) {\n      return replaced;\n    }\n  }\n  return value;\n}\nconst values: {\n  [key: string]: { [key: string]: { logical: string; physical: string }[] };\n} = {\n  \"horizontal-tb\": {\n    ltr: [\n      { logical: \"inline-start\", physical: \"left\" },\n      { logical: \"inline-end\", physical: \"right\" },\n      { logical: \"block-start\", physical: \"top\" },\n      { logical: \"block-end\", physical: \"bottom\" },\n      { logical: \"inline-size\", physical: \"width\" },\n      { logical: \"block-size\", physical: \"height\" },\n    ],\n    rtl: [\n      { logical: \"inline-start\", physical: \"right\" },\n      { logical: \"inline-end\", physical: \"left\" },\n      { logical: \"block-start\", physical: \"top\" },\n      { logical: \"block-end\", physical: \"bottom\" },\n      { logical: \"inline-size\", physical: \"width\" },\n      { logical: \"block-size\", physical: \"height\" },\n    ],\n  },\n  \"vertical-rl\": {\n    ltr: [\n      { logical: \"inline-start\", physical: \"top\" },\n      { logical: \"inline-end\", physical: \"bottom\" },\n      { logical: \"block-start\", physical: \"right\" },\n      { logical: \"block-end\", physical: \"left\" },\n      { logical: \"inline-size\", physical: \"height\" },\n      { logical: \"block-size\", physical: \"width\" },\n    ],\n    rtl: [\n      { logical: \"inline-start\", physical: \"bottom\" },\n      { logical: \"inline-end\", physical: \"top\" },\n      { logical: \"block-start\", physical: \"right\" },\n      { logical: \"block-end\", physical: \"left\" },\n      { logical: \"inline-size\", physical: \"height\" },\n      { logical: \"block-size\", physical: \"width\" },\n    ],\n  },\n  \"vertical-lr\": {\n    ltr: [\n      { logical: \"inline-start\", physical: \"top\" },\n      { logical: \"inline-end\", physical: \"bottom\" },\n      { logical: \"block-start\", physical: \"left\" },\n      { logical: \"block-end\", physical: \"right\" },\n      { logical: \"inline-size\", physical: \"height\" },\n      { logical: \"block-size\", physical: \"width\" },\n    ],\n    rtl: [\n      { logical: \"inline-start\", physical: \"bottom\" },\n      { logical: \"inline-end\", physical: \"top\" },\n      { logical: \"block-start\", physical: \"left\" },\n      { logical: \"block-end\", physical: \"right\" },\n      { logical: \"inline-size\", physical: \"height\" },\n      { logical: \"block-size\", physical: \"width\" },\n    ],\n  },\n};\nconst toPhysicalMaps = createRegExpMap(values, true);\n\nexport function toPhysical(\n  value: string,\n  writingMode: string,\n  direction?: string | null,\n): string {\n  return convert(value, writingMode, direction || null, toPhysicalMaps);\n}\nconst toLogicalMaps = createRegExpMap(values, false);\n\nexport function toLogical(\n  value: string,\n  writingMode: string,\n  direction?: string | null,\n): string {\n  return convert(value, writingMode, direction || null, toLogicalMaps);\n}\nconst lineRelativeValues: {\n  [key: string]: { logical: string; physical: string }[];\n} = {\n  \"horizontal-tb\": [\n    { logical: \"line-left\", physical: \"left\" },\n    { logical: \"line-right\", physical: \"right\" },\n    { logical: \"over\", physical: \"top\" },\n    { logical: \"under\", physical: \"bottom\" },\n  ],\n  \"vertical-rl\": [\n    { logical: \"line-left\", physical: \"top\" },\n    { logical: \"line-right\", physical: \"bottom\" },\n    { logical: \"over\", physical: \"right\" },\n    { logical: \"under\", physical: \"left\" },\n  ],\n  \"vertical-lr\": [\n    { logical: \"line-left\", physical: \"top\" },\n    { logical: \"line-right\", physical: \"bottom\" },\n    { logical: \"over\", physical: \"right\" },\n    { logical: \"under\", physical: \"left\" },\n  ],\n};\n\nexport function toLineRelative(value: string, writingMode: string): string {\n  const maps = lineRelativeValues[writingMode];\n  if (!maps) {\n    throw new Error(`unknown writing-mode: ${writingMode}`);\n  }\n  for (let i = 0; i < maps.length; i++) {\n    if (maps[i].physical === value) {\n      return maps[i].logical;\n    }\n  }\n  return value;\n}\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Sizing - CSS Intrinsic & Extrinsic Sizing\n */\nimport * as Base from \"./base\";\nimport * as Vtree from \"./vtree\";\n\n/**\n * Box sizes defined in css-sizing.\n * @enum {string}\n */\nexport enum Size {\n  FILL_AVAILABLE_INLINE_SIZE = \"fill-available inline size\",\n  FILL_AVAILABLE_BLOCK_SIZE = \"fill-available block size\",\n  FILL_AVAILABLE_WIDTH = \"fill-available width\",\n  FILL_AVAILABLE_HEIGHT = \"fill-available height\",\n  MAX_CONTENT_INLINE_SIZE = \"max-content inline size\",\n  MAX_CONTENT_BLOCK_SIZE = \"max-content block size\",\n  MAX_CONTENT_WIDTH = \"max-content width\",\n  MAX_CONTENT_HEIGHT = \"max-content height\",\n  MIN_CONTENT_INLINE_SIZE = \"min-content inline size\",\n  MIN_CONTENT_BLOCK_SIZE = \"min-content block size\",\n  MIN_CONTENT_WIDTH = \"min-content width\",\n  MIN_CONTENT_HEIGHT = \"min-content height\",\n  FIT_CONTENT_INLINE_SIZE = \"fit-content inline size\",\n  FIT_CONTENT_BLOCK_SIZE = \"fit-content block size\",\n  FIT_CONTENT_WIDTH = \"fit-content width\",\n  FIT_CONTENT_HEIGHT = \"fit-content height\",\n}\n\n/**\n * Get specified sizes for the element.\n */\nexport function getSize(\n  clientLayout: Vtree.ClientLayout,\n  element: Element,\n  sizes: Size[],\n): { [key in Size]: number } {\n  const original = {\n    display: (element as any).style.display,\n    position: (element as any).style.position,\n    width: (element as any).style.width as string,\n    maxWidth: (element as any).style.maxWidth as string,\n    minWidth: (element as any).style.minWidth as string,\n    height: (element as any).style.height as string,\n    maxHeight: (element as any).style.maxHeight as string,\n    minHeight: (element as any).style.minHeight as string,\n  };\n  const doc = element.ownerDocument;\n  const parent = element.parentNode;\n\n  // wrap the element with a dummy container element\n  const container = doc.createElement(\"div\");\n  Base.setCSSProperty(container, \"position\", original.position);\n  parent.insertBefore(container, element);\n  container.appendChild(element);\n  Base.setCSSProperty(element, \"width\", \"auto\");\n  Base.setCSSProperty(element, \"max-width\", \"none\");\n  Base.setCSSProperty(element, \"min-width\", \"0\");\n  Base.setCSSProperty(element, \"height\", \"auto\");\n  Base.setCSSProperty(element, \"max-height\", \"none\");\n  Base.setCSSProperty(element, \"min-height\", \"0\");\n\n  function getComputedValue(name: string): string {\n    return clientLayout.getElementComputedStyle(element).getPropertyValue(name);\n  }\n  const writingModeProperty = Base.getPrefixedPropertyNames(\"writing-mode\");\n  const writingModeValue =\n    (writingModeProperty ? getComputedValue(writingModeProperty[0]) : null) ||\n    getComputedValue(\"writing-mode\");\n  const isVertical =\n    writingModeValue === \"vertical-rl\" ||\n    writingModeValue === \"tb-rl\" ||\n    writingModeValue === \"vertical-lr\" ||\n    writingModeValue === \"tb-lr\";\n  const inlineSizeName = isVertical ? \"height\" : \"width\";\n  const blockSizeName = isVertical ? \"width\" : \"height\";\n\n  function getFillAvailableInline(): string {\n    Base.setCSSProperty(element, \"display\", \"block\");\n    Base.setCSSProperty(element, \"position\", \"static\");\n    return getComputedValue(inlineSizeName);\n  }\n\n  // Inline size of an inline-block element is the fit-content\n  // (shrink-to-fit) inline size.\n  function getMaxContentInline(): string {\n    Base.setCSSProperty(element, \"display\", \"inline-block\");\n\n    // When the available inline size is sufficiently large, the fit-content\n    // inline size equals to the max-content inline size.\n    Base.setCSSProperty(container, inlineSizeName, \"99999999px\"); // 'sufficiently large' value\n    const r = getComputedValue(inlineSizeName);\n    Base.setCSSProperty(container, inlineSizeName, \"\");\n    return r;\n  }\n\n  function getMinContentInline(): string {\n    Base.setCSSProperty(element, \"display\", \"inline-block\");\n\n    // When the available inline size is zero, the fit-content inline size\n    // equals to the min-content inline size.\n    Base.setCSSProperty(container, inlineSizeName, \"0\");\n    const r = getComputedValue(inlineSizeName);\n    Base.setCSSProperty(container, inlineSizeName, \"\");\n    return r;\n  }\n\n  function getFitContentInline(): string {\n    const fillAvailableInline = getFillAvailableInline();\n    const minContentInline = getMinContentInline();\n    const parsedFillAvailable = parseFloat(fillAvailableInline);\n    if (parsedFillAvailable <= parseFloat(minContentInline)) {\n      return minContentInline;\n    } else {\n      const maxContentInline = getMaxContentInline();\n      if (parsedFillAvailable <= parseFloat(maxContentInline)) {\n        return fillAvailableInline;\n      } else {\n        return maxContentInline;\n      }\n    }\n  }\n\n  function getIdealBlock(): string {\n    return getComputedValue(blockSizeName);\n  }\n\n  function getFillAvailableBlock(): string {\n    throw new Error(\"Getting fill-available block size is not implemented\");\n  }\n  const result = {} as { [key in Size]: number };\n  sizes.forEach((size) => {\n    let r: string;\n    switch (size) {\n      case Size.FILL_AVAILABLE_INLINE_SIZE:\n        r = getFillAvailableInline();\n        break;\n      case Size.MAX_CONTENT_INLINE_SIZE:\n        r = getMaxContentInline();\n        break;\n      case Size.MIN_CONTENT_INLINE_SIZE:\n        r = getMinContentInline();\n        break;\n      case Size.FIT_CONTENT_INLINE_SIZE:\n        r = getFitContentInline();\n        break;\n      case Size.FILL_AVAILABLE_BLOCK_SIZE:\n        r = getFillAvailableBlock();\n        break;\n      case Size.MAX_CONTENT_BLOCK_SIZE:\n      case Size.MIN_CONTENT_BLOCK_SIZE:\n      case Size.FIT_CONTENT_BLOCK_SIZE:\n        r = getIdealBlock();\n        break;\n      case Size.FILL_AVAILABLE_WIDTH:\n        r = isVertical ? getFillAvailableBlock() : getFillAvailableInline();\n        break;\n      case Size.FILL_AVAILABLE_HEIGHT:\n        r = isVertical ? getFillAvailableInline() : getFillAvailableBlock();\n        break;\n      case Size.MAX_CONTENT_WIDTH:\n        r = isVertical ? getIdealBlock() : getMaxContentInline();\n        break;\n      case Size.MAX_CONTENT_HEIGHT:\n        r = isVertical ? getMaxContentInline() : getIdealBlock();\n        break;\n      case Size.MIN_CONTENT_WIDTH:\n        r = isVertical ? getIdealBlock() : getMinContentInline();\n        break;\n      case Size.MIN_CONTENT_HEIGHT:\n        r = isVertical ? getMinContentInline() : getIdealBlock();\n        break;\n      case Size.FIT_CONTENT_WIDTH:\n        r = isVertical ? getIdealBlock() : getFitContentInline();\n        break;\n      case Size.FIT_CONTENT_HEIGHT:\n        r = isVertical ? getFitContentInline() : getIdealBlock();\n        break;\n    }\n    result[size] = parseFloat(r);\n    Base.setCSSProperty(element, \"position\", original.position);\n    Base.setCSSProperty(element, \"display\", original.display);\n  });\n  Base.setCSSProperty(element, \"width\", original.width);\n  Base.setCSSProperty(element, \"max-width\", original.maxWidth);\n  Base.setCSSProperty(element, \"min-width\", original.minWidth);\n  Base.setCSSProperty(element, \"height\", original.height);\n  Base.setCSSProperty(element, \"max-height\", original.maxHeight);\n  Base.setCSSProperty(element, \"min-height\", original.minHeight);\n  parent.insertBefore(element, container);\n  parent.removeChild(container);\n  return result;\n}\n","/**\n * This library modifies the diff-patch-match library by Neil Fraser\n * by removing the patch and match functionality and certain advanced\n * options in the diff function. The original license is as follows:\n *\n * ===\n *\n * Diff Match and Patch\n *\n * Copyright 2006 Google Inc.\n * http://code.google.com/p/google-diff-match-patch/\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n\n/**\n * The data structure representing a diff is an array of tuples:\n * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]\n * which means: delete 'Hello', add 'Goodbye' and keep ' world.'\n */\nvar DIFF_DELETE = -1;\nvar DIFF_INSERT = 1;\nvar DIFF_EQUAL = 0;\n\n\n/**\n * Find the differences between two texts.  Simplifies the problem by stripping\n * any common prefix or suffix off the texts before diffing.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {Int|Object} [cursor_pos] Edit position in text1 or object with more info\n * @return {Array} Array of diff tuples.\n */\nfunction diff_main(text1, text2, cursor_pos, _fix_unicode) {\n  // Check for equality\n  if (text1 === text2) {\n    if (text1) {\n      return [[DIFF_EQUAL, text1]];\n    }\n    return [];\n  }\n\n  if (cursor_pos != null) {\n    var editdiff = find_cursor_edit_diff(text1, text2, cursor_pos);\n    if (editdiff) {\n      return editdiff;\n    }\n  }\n\n  // Trim off common prefix (speedup).\n  var commonlength = diff_commonPrefix(text1, text2);\n  var commonprefix = text1.substring(0, commonlength);\n  text1 = text1.substring(commonlength);\n  text2 = text2.substring(commonlength);\n\n  // Trim off common suffix (speedup).\n  commonlength = diff_commonSuffix(text1, text2);\n  var commonsuffix = text1.substring(text1.length - commonlength);\n  text1 = text1.substring(0, text1.length - commonlength);\n  text2 = text2.substring(0, text2.length - commonlength);\n\n  // Compute the diff on the middle block.\n  var diffs = diff_compute_(text1, text2);\n\n  // Restore the prefix and suffix.\n  if (commonprefix) {\n    diffs.unshift([DIFF_EQUAL, commonprefix]);\n  }\n  if (commonsuffix) {\n    diffs.push([DIFF_EQUAL, commonsuffix]);\n  }\n  diff_cleanupMerge(diffs, _fix_unicode);\n  return diffs;\n};\n\n\n/**\n * Find the differences between two texts.  Assumes that the texts do not\n * have any common prefix or suffix.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @return {Array} Array of diff tuples.\n */\nfunction diff_compute_(text1, text2) {\n  var diffs;\n\n  if (!text1) {\n    // Just add some text (speedup).\n    return [[DIFF_INSERT, text2]];\n  }\n\n  if (!text2) {\n    // Just delete some text (speedup).\n    return [[DIFF_DELETE, text1]];\n  }\n\n  var longtext = text1.length > text2.length ? text1 : text2;\n  var shorttext = text1.length > text2.length ? text2 : text1;\n  var i = longtext.indexOf(shorttext);\n  if (i !== -1) {\n    // Shorter text is inside the longer text (speedup).\n    diffs = [\n      [DIFF_INSERT, longtext.substring(0, i)],\n      [DIFF_EQUAL, shorttext],\n      [DIFF_INSERT, longtext.substring(i + shorttext.length)]\n    ];\n    // Swap insertions for deletions if diff is reversed.\n    if (text1.length > text2.length) {\n      diffs[0][0] = diffs[2][0] = DIFF_DELETE;\n    }\n    return diffs;\n  }\n\n  if (shorttext.length === 1) {\n    // Single character string.\n    // After the previous speedup, the character can't be an equality.\n    return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];\n  }\n\n  // Check to see if the problem can be split in two.\n  var hm = diff_halfMatch_(text1, text2);\n  if (hm) {\n    // A half-match was found, sort out the return data.\n    var text1_a = hm[0];\n    var text1_b = hm[1];\n    var text2_a = hm[2];\n    var text2_b = hm[3];\n    var mid_common = hm[4];\n    // Send both pairs off for separate processing.\n    var diffs_a = diff_main(text1_a, text2_a);\n    var diffs_b = diff_main(text1_b, text2_b);\n    // Merge the results.\n    return diffs_a.concat([[DIFF_EQUAL, mid_common]], diffs_b);\n  }\n\n  return diff_bisect_(text1, text2);\n};\n\n\n/**\n * Find the 'middle snake' of a diff, split the problem in two\n * and return the recursively constructed diff.\n * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @return {Array} Array of diff tuples.\n * @private\n */\nfunction diff_bisect_(text1, text2) {\n  // Cache the text lengths to prevent multiple calls.\n  var text1_length = text1.length;\n  var text2_length = text2.length;\n  var max_d = Math.ceil((text1_length + text2_length) / 2);\n  var v_offset = max_d;\n  var v_length = 2 * max_d;\n  var v1 = new Array(v_length);\n  var v2 = new Array(v_length);\n  // Setting all elements to -1 is faster in Chrome & Firefox than mixing\n  // integers and undefined.\n  for (var x = 0; x < v_length; x++) {\n    v1[x] = -1;\n    v2[x] = -1;\n  }\n  v1[v_offset + 1] = 0;\n  v2[v_offset + 1] = 0;\n  var delta = text1_length - text2_length;\n  // If the total number of characters is odd, then the front path will collide\n  // with the reverse path.\n  var front = (delta % 2 !== 0);\n  // Offsets for start and end of k loop.\n  // Prevents mapping of space beyond the grid.\n  var k1start = 0;\n  var k1end = 0;\n  var k2start = 0;\n  var k2end = 0;\n  for (var d = 0; d < max_d; d++) {\n    // Walk the front path one step.\n    for (var k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {\n      var k1_offset = v_offset + k1;\n      var x1;\n      if (k1 === -d || (k1 !== d && v1[k1_offset - 1] < v1[k1_offset + 1])) {\n        x1 = v1[k1_offset + 1];\n      } else {\n        x1 = v1[k1_offset - 1] + 1;\n      }\n      var y1 = x1 - k1;\n      while (\n        x1 < text1_length && y1 < text2_length &&\n        text1.charAt(x1) === text2.charAt(y1)\n      ) {\n        x1++;\n        y1++;\n      }\n      v1[k1_offset] = x1;\n      if (x1 > text1_length) {\n        // Ran off the right of the graph.\n        k1end += 2;\n      } else if (y1 > text2_length) {\n        // Ran off the bottom of the graph.\n        k1start += 2;\n      } else if (front) {\n        var k2_offset = v_offset + delta - k1;\n        if (k2_offset >= 0 && k2_offset < v_length && v2[k2_offset] !== -1) {\n          // Mirror x2 onto top-left coordinate system.\n          var x2 = text1_length - v2[k2_offset];\n          if (x1 >= x2) {\n            // Overlap detected.\n            return diff_bisectSplit_(text1, text2, x1, y1);\n          }\n        }\n      }\n    }\n\n    // Walk the reverse path one step.\n    for (var k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {\n      var k2_offset = v_offset + k2;\n      var x2;\n      if (k2 === -d || (k2 !== d && v2[k2_offset - 1] < v2[k2_offset + 1])) {\n        x2 = v2[k2_offset + 1];\n      } else {\n        x2 = v2[k2_offset - 1] + 1;\n      }\n      var y2 = x2 - k2;\n      while (\n        x2 < text1_length && y2 < text2_length &&\n        text1.charAt(text1_length - x2 - 1) === text2.charAt(text2_length - y2 - 1)\n      ) {\n        x2++;\n        y2++;\n      }\n      v2[k2_offset] = x2;\n      if (x2 > text1_length) {\n        // Ran off the left of the graph.\n        k2end += 2;\n      } else if (y2 > text2_length) {\n        // Ran off the top of the graph.\n        k2start += 2;\n      } else if (!front) {\n        var k1_offset = v_offset + delta - k2;\n        if (k1_offset >= 0 && k1_offset < v_length && v1[k1_offset] !== -1) {\n          var x1 = v1[k1_offset];\n          var y1 = v_offset + x1 - k1_offset;\n          // Mirror x2 onto top-left coordinate system.\n          x2 = text1_length - x2;\n          if (x1 >= x2) {\n            // Overlap detected.\n            return diff_bisectSplit_(text1, text2, x1, y1);\n          }\n        }\n      }\n    }\n  }\n  // Diff took too long and hit the deadline or\n  // number of diffs equals number of characters, no commonality at all.\n  return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];\n};\n\n\n/**\n * Given the location of the 'middle snake', split the diff in two parts\n * and recurse.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {number} x Index of split point in text1.\n * @param {number} y Index of split point in text2.\n * @return {Array} Array of diff tuples.\n */\nfunction diff_bisectSplit_(text1, text2, x, y) {\n  var text1a = text1.substring(0, x);\n  var text2a = text2.substring(0, y);\n  var text1b = text1.substring(x);\n  var text2b = text2.substring(y);\n\n  // Compute both diffs serially.\n  var diffs = diff_main(text1a, text2a);\n  var diffsb = diff_main(text1b, text2b);\n\n  return diffs.concat(diffsb);\n};\n\n\n/**\n * Determine the common prefix of two strings.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {number} The number of characters common to the start of each\n *     string.\n */\nfunction diff_commonPrefix(text1, text2) {\n  // Quick check for common null cases.\n  if (!text1 || !text2 || text1.charAt(0) !== text2.charAt(0)) {\n    return 0;\n  }\n  // Binary search.\n  // Performance analysis: http://neil.fraser.name/news/2007/10/09/\n  var pointermin = 0;\n  var pointermax = Math.min(text1.length, text2.length);\n  var pointermid = pointermax;\n  var pointerstart = 0;\n  while (pointermin < pointermid) {\n    if (\n      text1.substring(pointerstart, pointermid) ==\n      text2.substring(pointerstart, pointermid)\n    ) {\n      pointermin = pointermid;\n      pointerstart = pointermin;\n    } else {\n      pointermax = pointermid;\n    }\n    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);\n  }\n\n  if (is_surrogate_pair_start(text1.charCodeAt(pointermid - 1))) {\n    pointermid--;\n  }\n\n  return pointermid;\n};\n\n\n/**\n * Determine the common suffix of two strings.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {number} The number of characters common to the end of each string.\n */\nfunction diff_commonSuffix(text1, text2) {\n  // Quick check for common null cases.\n  if (!text1 || !text2 || text1.slice(-1) !== text2.slice(-1)) {\n    return 0;\n  }\n  // Binary search.\n  // Performance analysis: http://neil.fraser.name/news/2007/10/09/\n  var pointermin = 0;\n  var pointermax = Math.min(text1.length, text2.length);\n  var pointermid = pointermax;\n  var pointerend = 0;\n  while (pointermin < pointermid) {\n    if (\n      text1.substring(text1.length - pointermid, text1.length - pointerend) ==\n      text2.substring(text2.length - pointermid, text2.length - pointerend)\n    ) {\n      pointermin = pointermid;\n      pointerend = pointermin;\n    } else {\n      pointermax = pointermid;\n    }\n    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);\n  }\n\n  if (is_surrogate_pair_end(text1.charCodeAt(text1.length - pointermid))) {\n    pointermid--;\n  }\n\n  return pointermid;\n};\n\n\n/**\n * Do the two texts share a substring which is at least half the length of the\n * longer text?\n * This speedup can produce non-minimal diffs.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {Array.<string>} Five element Array, containing the prefix of\n *     text1, the suffix of text1, the prefix of text2, the suffix of\n *     text2 and the common middle.  Or null if there was no match.\n */\nfunction diff_halfMatch_(text1, text2) {\n  var longtext = text1.length > text2.length ? text1 : text2;\n  var shorttext = text1.length > text2.length ? text2 : text1;\n  if (longtext.length < 4 || shorttext.length * 2 < longtext.length) {\n    return null;  // Pointless.\n  }\n\n  /**\n   * Does a substring of shorttext exist within longtext such that the substring\n   * is at least half the length of longtext?\n   * Closure, but does not reference any external variables.\n   * @param {string} longtext Longer string.\n   * @param {string} shorttext Shorter string.\n   * @param {number} i Start index of quarter length substring within longtext.\n   * @return {Array.<string>} Five element Array, containing the prefix of\n   *     longtext, the suffix of longtext, the prefix of shorttext, the suffix\n   *     of shorttext and the common middle.  Or null if there was no match.\n   * @private\n   */\n  function diff_halfMatchI_(longtext, shorttext, i) {\n    // Start with a 1/4 length substring at position i as a seed.\n    var seed = longtext.substring(i, i + Math.floor(longtext.length / 4));\n    var j = -1;\n    var best_common = '';\n    var best_longtext_a, best_longtext_b, best_shorttext_a, best_shorttext_b;\n    while ((j = shorttext.indexOf(seed, j + 1)) !== -1) {\n      var prefixLength = diff_commonPrefix(\n        longtext.substring(i), shorttext.substring(j));\n      var suffixLength = diff_commonSuffix(\n        longtext.substring(0, i), shorttext.substring(0, j));\n      if (best_common.length < suffixLength + prefixLength) {\n        best_common = shorttext.substring(\n          j - suffixLength, j) + shorttext.substring(j, j + prefixLength);\n        best_longtext_a = longtext.substring(0, i - suffixLength);\n        best_longtext_b = longtext.substring(i + prefixLength);\n        best_shorttext_a = shorttext.substring(0, j - suffixLength);\n        best_shorttext_b = shorttext.substring(j + prefixLength);\n      }\n    }\n    if (best_common.length * 2 >= longtext.length) {\n      return [\n        best_longtext_a, best_longtext_b,\n        best_shorttext_a, best_shorttext_b, best_common\n      ];\n    } else {\n      return null;\n    }\n  }\n\n  // First check if the second quarter is the seed for a half-match.\n  var hm1 = diff_halfMatchI_(longtext, shorttext, Math.ceil(longtext.length / 4));\n  // Check again based on the third quarter.\n  var hm2 = diff_halfMatchI_(longtext, shorttext, Math.ceil(longtext.length / 2));\n  var hm;\n  if (!hm1 && !hm2) {\n    return null;\n  } else if (!hm2) {\n    hm = hm1;\n  } else if (!hm1) {\n    hm = hm2;\n  } else {\n    // Both matched.  Select the longest.\n    hm = hm1[4].length > hm2[4].length ? hm1 : hm2;\n  }\n\n  // A half-match was found, sort out the return data.\n  var text1_a, text1_b, text2_a, text2_b;\n  if (text1.length > text2.length) {\n    text1_a = hm[0];\n    text1_b = hm[1];\n    text2_a = hm[2];\n    text2_b = hm[3];\n  } else {\n    text2_a = hm[0];\n    text2_b = hm[1];\n    text1_a = hm[2];\n    text1_b = hm[3];\n  }\n  var mid_common = hm[4];\n  return [text1_a, text1_b, text2_a, text2_b, mid_common];\n};\n\n\n/**\n * Reorder and merge like edit sections.  Merge equalities.\n * Any edit section can move as long as it doesn't cross an equality.\n * @param {Array} diffs Array of diff tuples.\n * @param {boolean} fix_unicode Whether to normalize to a unicode-correct diff\n */\nfunction diff_cleanupMerge(diffs, fix_unicode) {\n  diffs.push([DIFF_EQUAL, '']);  // Add a dummy entry at the end.\n  var pointer = 0;\n  var count_delete = 0;\n  var count_insert = 0;\n  var text_delete = '';\n  var text_insert = '';\n  var commonlength;\n  while (pointer < diffs.length) {\n    if (pointer < diffs.length - 1 && !diffs[pointer][1]) {\n      diffs.splice(pointer, 1);\n      continue;\n    }\n    switch (diffs[pointer][0]) {\n      case DIFF_INSERT:\n\n        count_insert++;\n        text_insert += diffs[pointer][1];\n        pointer++;\n        break;\n      case DIFF_DELETE:\n        count_delete++;\n        text_delete += diffs[pointer][1];\n        pointer++;\n        break;\n      case DIFF_EQUAL:\n        var previous_equality = pointer - count_insert - count_delete - 1;\n        if (fix_unicode) {\n          // prevent splitting of unicode surrogate pairs.  when fix_unicode is true,\n          // we assume that the old and new text in the diff are complete and correct\n          // unicode-encoded JS strings, but the tuple boundaries may fall between\n          // surrogate pairs.  we fix this by shaving off stray surrogates from the end\n          // of the previous equality and the beginning of this equality.  this may create\n          // empty equalities or a common prefix or suffix.  for example, if AB and AC are\n          // emojis, `[[0, 'A'], [-1, 'BA'], [0, 'C']]` would turn into deleting 'ABAC' and\n          // inserting 'AC', and then the common suffix 'AC' will be eliminated.  in this\n          // particular case, both equalities go away, we absorb any previous inequalities,\n          // and we keep scanning for the next equality before rewriting the tuples.\n          if (previous_equality >= 0 && ends_with_pair_start(diffs[previous_equality][1])) {\n            var stray = diffs[previous_equality][1].slice(-1);\n            diffs[previous_equality][1] = diffs[previous_equality][1].slice(0, -1);\n            text_delete = stray + text_delete;\n            text_insert = stray + text_insert;\n            if (!diffs[previous_equality][1]) {\n              // emptied out previous equality, so delete it and include previous delete/insert\n              diffs.splice(previous_equality, 1);\n              pointer--;\n              var k = previous_equality - 1;\n              if (diffs[k] && diffs[k][0] === DIFF_INSERT) {\n                count_insert++;\n                text_insert = diffs[k][1] + text_insert;\n                k--;\n              }\n              if (diffs[k] && diffs[k][0] === DIFF_DELETE) {\n                count_delete++;\n                text_delete = diffs[k][1] + text_delete;\n                k--;\n              }\n              previous_equality = k;\n            }\n          }\n          if (starts_with_pair_end(diffs[pointer][1])) {\n            var stray = diffs[pointer][1].charAt(0);\n            diffs[pointer][1] = diffs[pointer][1].slice(1);\n            text_delete += stray;\n            text_insert += stray;\n          }\n        }\n        if (pointer < diffs.length - 1 && !diffs[pointer][1]) {\n          // for empty equality not at end, wait for next equality\n          diffs.splice(pointer, 1);\n          break;\n        }\n        if (text_delete.length > 0 || text_insert.length > 0) {\n          // note that diff_commonPrefix and diff_commonSuffix are unicode-aware\n          if (text_delete.length > 0 && text_insert.length > 0) {\n            // Factor out any common prefixes.\n            commonlength = diff_commonPrefix(text_insert, text_delete);\n            if (commonlength !== 0) {\n              if (previous_equality >= 0) {\n                diffs[previous_equality][1] += text_insert.substring(0, commonlength);\n              } else {\n                diffs.splice(0, 0, [DIFF_EQUAL, text_insert.substring(0, commonlength)]);\n                pointer++;\n              }\n              text_insert = text_insert.substring(commonlength);\n              text_delete = text_delete.substring(commonlength);\n            }\n            // Factor out any common suffixes.\n            commonlength = diff_commonSuffix(text_insert, text_delete);\n            if (commonlength !== 0) {\n              diffs[pointer][1] =\n                text_insert.substring(text_insert.length - commonlength) + diffs[pointer][1];\n              text_insert = text_insert.substring(0, text_insert.length - commonlength);\n              text_delete = text_delete.substring(0, text_delete.length - commonlength);\n            }\n          }\n          // Delete the offending records and add the merged ones.\n          var n = count_insert + count_delete;\n          if (text_delete.length === 0 && text_insert.length === 0) {\n            diffs.splice(pointer - n, n);\n            pointer = pointer - n;\n          } else if (text_delete.length === 0) {\n            diffs.splice(pointer - n, n, [DIFF_INSERT, text_insert]);\n            pointer = pointer - n + 1;\n          } else if (text_insert.length === 0) {\n            diffs.splice(pointer - n, n, [DIFF_DELETE, text_delete]);\n            pointer = pointer - n + 1;\n          } else {\n            diffs.splice(pointer - n, n, [DIFF_DELETE, text_delete], [DIFF_INSERT, text_insert]);\n            pointer = pointer - n + 2;\n          }\n        }\n        if (pointer !== 0 && diffs[pointer - 1][0] === DIFF_EQUAL) {\n          // Merge this equality with the previous one.\n          diffs[pointer - 1][1] += diffs[pointer][1];\n          diffs.splice(pointer, 1);\n        } else {\n          pointer++;\n        }\n        count_insert = 0;\n        count_delete = 0;\n        text_delete = '';\n        text_insert = '';\n        break;\n    }\n  }\n  if (diffs[diffs.length - 1][1] === '') {\n    diffs.pop();  // Remove the dummy entry at the end.\n  }\n\n  // Second pass: look for single edits surrounded on both sides by equalities\n  // which can be shifted sideways to eliminate an equality.\n  // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC\n  var changes = false;\n  pointer = 1;\n  // Intentionally ignore the first and last element (don't need checking).\n  while (pointer < diffs.length - 1) {\n    if (diffs[pointer - 1][0] === DIFF_EQUAL &&\n      diffs[pointer + 1][0] === DIFF_EQUAL) {\n      // This is a single edit surrounded by equalities.\n      if (diffs[pointer][1].substring(diffs[pointer][1].length -\n        diffs[pointer - 1][1].length) === diffs[pointer - 1][1]) {\n        // Shift the edit over the previous equality.\n        diffs[pointer][1] = diffs[pointer - 1][1] +\n          diffs[pointer][1].substring(0, diffs[pointer][1].length -\n            diffs[pointer - 1][1].length);\n        diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];\n        diffs.splice(pointer - 1, 1);\n        changes = true;\n      } else if (diffs[pointer][1].substring(0, diffs[pointer + 1][1].length) ==\n        diffs[pointer + 1][1]) {\n        // Shift the edit over the next equality.\n        diffs[pointer - 1][1] += diffs[pointer + 1][1];\n        diffs[pointer][1] =\n          diffs[pointer][1].substring(diffs[pointer + 1][1].length) +\n          diffs[pointer + 1][1];\n        diffs.splice(pointer + 1, 1);\n        changes = true;\n      }\n    }\n    pointer++;\n  }\n  // If shifts were made, the diff needs reordering and another shift sweep.\n  if (changes) {\n    diff_cleanupMerge(diffs, fix_unicode);\n  }\n};\n\nfunction is_surrogate_pair_start(charCode) {\n  return charCode >= 0xD800 && charCode <= 0xDBFF;\n}\n\nfunction is_surrogate_pair_end(charCode) {\n  return charCode >= 0xDC00 && charCode <= 0xDFFF;\n}\n\nfunction starts_with_pair_end(str) {\n  return is_surrogate_pair_end(str.charCodeAt(0));\n}\n\nfunction ends_with_pair_start(str) {\n  return is_surrogate_pair_start(str.charCodeAt(str.length - 1));\n}\n\nfunction remove_empty_tuples(tuples) {\n  var ret = [];\n  for (var i = 0; i < tuples.length; i++) {\n    if (tuples[i][1].length > 0) {\n      ret.push(tuples[i]);\n    }\n  }\n  return ret;\n}\n\nfunction make_edit_splice(before, oldMiddle, newMiddle, after) {\n  if (ends_with_pair_start(before) || starts_with_pair_end(after)) {\n    return null;\n  }\n  return remove_empty_tuples([\n    [DIFF_EQUAL, before],\n    [DIFF_DELETE, oldMiddle],\n    [DIFF_INSERT, newMiddle],\n    [DIFF_EQUAL, after]\n  ]);\n}\n\nfunction find_cursor_edit_diff(oldText, newText, cursor_pos) {\n  // note: this runs after equality check has ruled out exact equality\n  var oldRange = typeof cursor_pos === 'number' ?\n    { index: cursor_pos, length: 0 } : cursor_pos.oldRange;\n  var newRange = typeof cursor_pos === 'number' ?\n    null : cursor_pos.newRange;\n  // take into account the old and new selection to generate the best diff\n  // possible for a text edit.  for example, a text change from \"xxx\" to \"xx\"\n  // could be a delete or forwards-delete of any one of the x's, or the\n  // result of selecting two of the x's and typing \"x\".\n  var oldLength = oldText.length;\n  var newLength = newText.length;\n  if (oldRange.length === 0 && (newRange === null || newRange.length === 0)) {\n    // see if we have an insert or delete before or after cursor\n    var oldCursor = oldRange.index;\n    var oldBefore = oldText.slice(0, oldCursor);\n    var oldAfter = oldText.slice(oldCursor);\n    var maybeNewCursor = newRange ? newRange.index : null;\n    editBefore: {\n      // is this an insert or delete right before oldCursor?\n      var newCursor = oldCursor + newLength - oldLength;\n      if (maybeNewCursor !== null && maybeNewCursor !== newCursor) {\n        break editBefore;\n      }\n      if (newCursor < 0 || newCursor > newLength) {\n        break editBefore;\n      }\n      var newBefore = newText.slice(0, newCursor);\n      var newAfter = newText.slice(newCursor);\n      if (newAfter !== oldAfter) {\n        break editBefore;\n      }\n      var prefixLength = Math.min(oldCursor, newCursor);\n      var oldPrefix = oldBefore.slice(0, prefixLength);\n      var newPrefix = newBefore.slice(0, prefixLength);\n      if (oldPrefix !== newPrefix) {\n        break editBefore;\n      }\n      var oldMiddle = oldBefore.slice(prefixLength);\n      var newMiddle = newBefore.slice(prefixLength);\n      return make_edit_splice(oldPrefix, oldMiddle, newMiddle, oldAfter);\n    }\n    editAfter: {\n      // is this an insert or delete right after oldCursor?\n      if (maybeNewCursor !== null && maybeNewCursor !== oldCursor) {\n        break editAfter;\n      }\n      var cursor = oldCursor;\n      var newBefore = newText.slice(0, cursor);\n      var newAfter = newText.slice(cursor);\n      if (newBefore !== oldBefore) {\n        break editAfter;\n      }\n      var suffixLength = Math.min(oldLength - cursor, newLength - cursor);\n      var oldSuffix = oldAfter.slice(oldAfter.length - suffixLength);\n      var newSuffix = newAfter.slice(newAfter.length - suffixLength);\n      if (oldSuffix !== newSuffix) {\n        break editAfter;\n      }\n      var oldMiddle = oldAfter.slice(0, oldAfter.length - suffixLength);\n      var newMiddle = newAfter.slice(0, newAfter.length - suffixLength);\n      return make_edit_splice(oldBefore, oldMiddle, newMiddle, oldSuffix);\n    }\n  }\n  if (oldRange.length > 0 && newRange && newRange.length === 0) {\n    replaceRange: {\n      // see if diff could be a splice of the old selection range\n      var oldPrefix = oldText.slice(0, oldRange.index);\n      var oldSuffix = oldText.slice(oldRange.index + oldRange.length);\n      var prefixLength = oldPrefix.length;\n      var suffixLength = oldSuffix.length;\n      if (newLength < prefixLength + suffixLength) {\n        break replaceRange;\n      }\n      var newPrefix = newText.slice(0, prefixLength);\n      var newSuffix = newText.slice(newLength - suffixLength);\n      if (oldPrefix !== newPrefix || oldSuffix !== newSuffix) {\n        break replaceRange;\n      }\n      var oldMiddle = oldText.slice(prefixLength, oldLength - suffixLength);\n      var newMiddle = newText.slice(prefixLength, newLength - suffixLength);\n      return make_edit_splice(oldPrefix, oldMiddle, newMiddle, oldSuffix);\n    }\n  }\n\n  return null;\n}\n\nfunction diff(text1, text2, cursor_pos) {\n  // only pass fix_unicode=true at the top level, not when diff_main is\n  // recursively invoked\n  return diff_main(text1, text2, cursor_pos, true);\n}\n\ndiff.INSERT = DIFF_INSERT;\ndiff.DELETE = DIFF_DELETE;\ndiff.EQUAL = DIFF_EQUAL;\n\nmodule.exports = diff;\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Types - Type definiions.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as Diff from \"./diff\";\nimport * as Exprs from \"./exprs\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\n\nexport type FormattingContextType =\n  | \"Block\"\n  | \"RepetitiveElementsOwner\"\n  | \"Table\";\n\nexport type FragmentLayoutConstraintType =\n  | \"AfterIfContinue\"\n  | \"EntireTable\"\n  | \"RepetitiveElementsOwner\"\n  | \"TableRow\";\n\nexport namespace CssCascade {\n  export interface ElementStyle {}\n}\n\nexport namespace CssStyler {\n  export interface AbstractStyler {\n    getStyle(element: Element, deep: boolean): CssCascade.ElementStyle;\n    processContent(element: Element, styles: { [key: string]: Css.Val });\n  }\n}\n\nexport namespace Layout {\n  /**\n   * Represents a constraint on layout\n   */\n  export interface LayoutConstraint {\n    /**\n     * Returns if this constraint allows the node context to be laid out at the\n     * current position.\n     */\n    allowLayout(nodeContext: Vtree.NodeContext): boolean;\n  }\n  /**\n   * Represents constraints on laying out fragments\n   */\n  export interface FragmentLayoutConstraint {\n    flagmentLayoutConstraintType: FragmentLayoutConstraintType;\n    allowLayout(\n      nodeContext: Vtree.NodeContext,\n      overflownNodeContext: Vtree.NodeContext,\n      column: Column,\n    ): boolean;\n    nextCandidate(nodeContext: Vtree.NodeContext): boolean;\n    postLayout(\n      allowed: boolean,\n      positionAfter: Vtree.NodeContext,\n      initialPosition: Vtree.NodeContext,\n      column: Column,\n    );\n    finishBreak(\n      nodeContext: Vtree.NodeContext,\n      column: Column,\n    ): Task.Result<boolean>;\n    equalsTo(constraint: FragmentLayoutConstraint): boolean;\n    getPriorityOfFinishBreak(): number;\n  }\n\n  /**\n   * Potential breaking position.\n   */\n  export interface BreakPosition {\n    /**\n     * @return break position, if found\n     */\n    findAcceptableBreak(column: Column, penalty: number): Vtree.NodeContext;\n    /**\n     * @return penalty for this break position\n     */\n    getMinBreakPenalty(): number;\n    calculateOffset(column: Column): { current: number; minimum: number };\n    breakPositionChosen(column: Column): void;\n  }\n\n  export interface AbstractBreakPosition extends BreakPosition {\n    getNodeContext(): Vtree.NodeContext;\n  }\n\n  export type BreakPositionAndNodeContext = {\n    breakPosition: BreakPosition;\n    nodeContext: Vtree.NodeContext;\n  };\n\n  /**\n   * Potential breaking position inside CSS box (between lines).\n   * @param checkPoints array of breaking points for\n   *    breakable block\n   */\n  export interface BoxBreakPosition extends AbstractBreakPosition {\n    breakNodeContext: Vtree.NodeContext;\n    readonly checkPoints: Vtree.NodeContext[];\n    readonly penalty: number;\n  }\n\n  /**\n   * Potential edge breaking position.\n   */\n  export interface EdgeBreakPosition extends AbstractBreakPosition {\n    overflowIfRepetitiveElementsDropped: boolean;\n    readonly position: Vtree.NodeContext;\n    readonly breakOnEdge: string | null;\n    overflows: boolean;\n    readonly computedBlockSize: number;\n  }\n\n  export interface Column extends Vtree.Container {\n    last: Node;\n    viewDocument: Document;\n    flowRootFormattingContext: Vtree.FormattingContext;\n    isFloat: boolean;\n    isFootnote: boolean;\n    startEdge: number;\n    endEdge: number;\n    beforeEdge: number;\n    afterEdge: number;\n    footnoteEdge: number;\n    box: GeometryUtil.Rect;\n    chunkPositions: Vtree.ChunkPosition[];\n    bands: GeometryUtil.Band[];\n    overflown: boolean;\n    breakPositions: BreakPosition[];\n    pageBreakType: string | null;\n    forceNonfitting: boolean;\n    leftFloatEdge: number;\n    /**\n     * bottom of the bottommost left float\n     */\n    rightFloatEdge: number;\n    /**\n     * bottom of the bottommost right float\n     */\n    bottommostFloatTop: number;\n    /**\n     * Top of the bottommost float\n     */\n    stopAtOverflow: boolean;\n    lastAfterPosition: Vtree.NodePosition | null;\n    fragmentLayoutConstraints: FragmentLayoutConstraint[];\n    pseudoParent: Column;\n    nodeContextOverflowingDueToRepetitiveElements: Vtree.NodeContext | null;\n    blockDistanceToBlockEndFloats: number;\n    computedBlockSize: number;\n\n    layoutContext: Vtree.LayoutContext;\n    clientLayout: Vtree.ClientLayout;\n    readonly layoutConstraint: LayoutConstraint;\n    readonly pageFloatLayoutContext: PageFloats.PageFloatLayoutContext;\n\n    getTopEdge(): number;\n    getBottomEdge(): number;\n    getLeftEdge(): number;\n    getRightEdge(): number;\n    isFloatNodeContext(nodeContext: Vtree.NodeContext): boolean;\n    stopByOverflow(nodeContext: Vtree.NodeContext): boolean;\n    isOverflown(edge: number): boolean;\n    getExclusions(): GeometryUtil.Shape[];\n    openAllViews(position: Vtree.NodePosition): Task.Result<Vtree.NodeContext>;\n    calculateOffsetInNodeForNodeContext(position: Vtree.NodePosition): number;\n    /**\n     * @param count first-XXX nesting identifier\n     */\n    maybePeelOff(\n      position: Vtree.NodeContext,\n      count: number,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Builds the view until a CSS box edge is reached.\n     * @param position start source position.\n     * @param checkPoints array to append possible breaking points.\n     * @return holding box edge position reached or null if the source is exhausted.\n     */\n    buildViewToNextBlockEdge(\n      position: Vtree.NodeContext,\n      checkPoints: Vtree.NodeContext[],\n    ): Task.Result<Vtree.NodeContext>;\n    nextInTree(\n      position: Vtree.NodeContext,\n      atUnforcedBreak?: boolean,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Builds the view for a single unbreakable element.\n     * @param position start source position.\n     * @return holding box edge position reached or null if the source is exhausted.\n     */\n    buildDeepElementView(\n      position: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n\n    /**\n     * Create a single floating element (for exclusion areas).\n     * @param ref container's child to insert float before (can be null).\n     * @param side float side (\"left\" or \"right\").\n     * @param width float inline dimension.\n     * @param height float box progression dimension.\n     * @return newly created float element.\n     */\n    createFloat(\n      ref: Node,\n      side: string,\n      width: number,\n      height: number,\n    ): Element;\n    /**\n     * Remove all the exclusion floats.\n     */\n    killFloats(): void;\n    /**\n     * Create exclusion floats for a column.\n     */\n    createFloats(): void;\n    /**\n     * @param nodeContext position after the block\n     * @param checkPoints array of possible breaking points.\n     * @param index index of the breaking point\n     * @param boxOffset box offset\n     * @return edge position\n     */\n    calculateEdge(\n      nodeContext: Vtree.NodeContext,\n      checkPoints: Vtree.NodeContext[],\n      index: number,\n      boxOffset: number,\n    ): number;\n    /**\n     * Parse CSS computed length (in pixels)\n     * @param val CSS length in \"px\" units or a number.\n     * @return value in pixels or 0 if not parsable\n     */\n    parseComputedLength(val: string | number): number;\n    /**\n     * Reads element's computed CSS margin.\n     */\n    getComputedMargin(element: Element): GeometryUtil.Insets;\n    /**\n     * Reads element's computed padding + borders.\n     */\n    getComputedPaddingBorder(element: Element): GeometryUtil.Insets;\n    /**\n     * Reads element's computed CSS insets(margins + border + padding or margins :\n     * depends on box-sizing)\n     */\n    getComputedInsets(element: Element): GeometryUtil.Insets;\n    /**\n     * Set element's computed CSS insets to Column Container\n     */\n    setComputedInsets(element: Element, container: Column): void;\n    /**\n     * Set element's computed width and height to Column Container\n     */\n    setComputedWidthAndHeight(element: Element, container: Column): void;\n    /**\n     * Layout a single unbreakable element.\n     */\n    layoutUnbreakable(\n      nodeContextIn: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Layout a single float element.\n     */\n    layoutFloat(nodeContext: Vtree.NodeContext): Task.Result<Vtree.NodeContext>;\n\n    setupFloatArea(\n      area: PageFloatArea,\n      floatReference: PageFloats.FloatReference,\n      floatSide: string,\n      anchorEdge: number | null,\n      strategy: PageFloats.PageFloatLayoutStrategy,\n      condition: PageFloats.PageFloatPlacementCondition,\n    ): boolean;\n    createPageFloatArea(\n      float: PageFloats.PageFloat | null,\n      floatSide: string,\n      anchorEdge: number | null,\n      strategy: PageFloats.PageFloatLayoutStrategy,\n      condition: PageFloats.PageFloatPlacementCondition,\n    ): PageFloatArea | null;\n    layoutSinglePageFloatFragment(\n      continuations: PageFloats.PageFloatContinuation[],\n      floatSide: string,\n      clearSide: string | null,\n      allowFragmented: boolean,\n      strategy: PageFloats.PageFloatLayoutStrategy,\n      anchorEdge: number | null,\n      pageFloatFragment?: PageFloats.PageFloatFragment | null,\n    ): Task.Result<SinglePageFloatLayoutResult>;\n    layoutPageFloatInner(\n      continuation: PageFloats.PageFloatContinuation,\n      strategy: PageFloats.PageFloatLayoutStrategy,\n      anchorEdge: number | null,\n      pageFloatFragment?: PageFloats.PageFloatFragment,\n    ): Task.Result<boolean>;\n    setFloatAnchorViewNode(nodeContext: Vtree.NodeContext): Vtree.NodeContext;\n    resolveFloatReferenceFromColumnSpan(\n      floatReference: PageFloats.FloatReference,\n      columnSpan: Css.Val,\n      nodeContext: Vtree.NodeContext,\n    ): Task.Result<PageFloats.FloatReference>;\n    layoutPageFloat(\n      nodeContext: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n    createJustificationAdjustmentElement(\n      insertionPoint: Node,\n      doc: Document,\n      parentNode: Node,\n      vertical: boolean,\n    ): HTMLElement;\n    addAndAdjustJustificationElement(\n      nodeContext: Vtree.NodeContext,\n      insertAfter: boolean,\n      node: Node,\n      insertionPoint: Node,\n      doc: Document,\n      parentNode: Node,\n    ): HTMLElement;\n    compensateJustificationLineHeight(\n      span: Element,\n      br: Element,\n      nodeContext: Vtree.NodeContext,\n    ): void;\n    /**\n     * Fix justification of the last line of text broken across pages (if\n     * needed).\n     */\n    fixJustificationIfNeeded(\n      nodeContext: Vtree.NodeContext,\n      endOfColumn: boolean,\n    ): void;\n    processLineStyling(\n      nodeContext: Vtree.NodeContext,\n      resNodeContext: Vtree.NodeContext,\n      checkPoints: Vtree.NodeContext[],\n    ): Task.Result<Vtree.NodeContext>;\n    isLoneImage(checkPoints: Vtree.NodeContext[]): boolean;\n    getTrailingMarginEdgeAdjustment(\n      trailingEdgeContexts: Vtree.NodeContext[],\n    ): number;\n    /**\n     * Layout a single CSS box.\n     */\n    layoutBreakableBlock(\n      nodeContext: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n    postLayoutBlock(\n      nodeContext: Vtree.NodeContext,\n      checkPoints: Vtree.NodeContext[],\n    ): void;\n    findEndOfLine(\n      linePosition: number,\n      checkPoints: Vtree.NodeContext[],\n      isUpdateMaxReachedAfterEdge: boolean,\n    ): {\n      nodeContext: Vtree.NodeContext;\n      index: number;\n      checkPointIndex: number;\n    };\n    findAcceptableBreakInside(\n      checkPoints: Vtree.NodeContext[],\n      edgePosition: number,\n      force: boolean,\n    ): Vtree.NodeContext;\n    resolveTextNodeBreaker(nodeContext: Vtree.NodeContext): TextNodeBreaker;\n    /**\n     * Read ranges skipping special elments\n     */\n    getRangeBoxes(start: Node, end: Node): Vtree.ClientRect[];\n    /**\n     * Give block's initial and final nodes, find positions of the line bottoms.\n     * This is, of course, somewhat hacky implementation.\n     * @return position of line breaks\n     */\n    findLinePositions(checkPoints: Vtree.NodeContext[]): number[];\n    calculateClonedPaddingBorder(nodeContext: Vtree.NodeContext): number;\n    findBoxBreakPosition(\n      bp: BoxBreakPosition,\n      force: boolean,\n    ): Vtree.NodeContext;\n    getAfterEdgeOfBlockContainer(nodeContext: Vtree.NodeContext): number;\n    findFirstOverflowingEdgeAndCheckPoint(\n      checkPoints: Vtree.NodeContext[],\n    ): { edge: number; checkPoint: Vtree.NodeContext | null };\n    findEdgeBreakPosition(bp: EdgeBreakPosition): Vtree.NodeContext;\n    /**\n     * Finalize a line break.\n     * @return holing true\n     */\n    finishBreak(\n      nodeContext: Vtree.NodeContext,\n      forceRemoveSelf: boolean,\n      endOfColumn: boolean,\n    ): Task.Result<boolean>;\n    findAcceptableBreakPosition(): BreakPositionAndNodeContext;\n    doFinishBreak(\n      nodeContext: Vtree.NodeContext,\n      overflownNodeContext: Vtree.NodeContext,\n      initialNodeContext: Vtree.NodeContext,\n      initialComputedBlockSize: number,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Determines if a page break is acceptable at this position\n     */\n    isBreakable(flowPosition: Vtree.NodeContext): boolean;\n    /**\n     * Determines if an indent value is zero\n     */\n    zeroIndent(val: string | number): boolean;\n    /**\n     * @return true if overflows\n     */\n    checkOverflowAndSaveEdge(\n      nodeContext: Vtree.NodeContext,\n      trailingEdgeContexts: Vtree.NodeContext[],\n    ): boolean;\n    /**\n     * Save a possible page break position on a CSS block edge. Check if it\n     * overflows.\n     * @return true if overflows\n     */\n    checkOverflowAndSaveEdgeAndBreakPosition(\n      nodeContext: Vtree.NodeContext,\n      trailingEdgeContexts: Vtree.NodeContext[],\n      saveEvenOverflown: boolean,\n      breakAtTheEdge: string | null,\n    ): boolean;\n    applyClearance(nodeContext: Vtree.NodeContext): boolean;\n    isBFC(formattingContext: Vtree.FormattingContext): boolean;\n    /**\n     * Skips positions until either the start of unbreakable block or inline\n     * content. Also sets breakBefore on the result combining break-before and\n     * break-after properties from all elements that meet at the edge.\n     */\n    skipEdges(\n      nodeContext: Vtree.NodeContext,\n      leadingEdge: boolean,\n      forcedBreakValue: string | null,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Skips non-renderable positions until it hits the end of the flow or some\n     * renderable content. Returns the nodeContext that was passed in if some\n     * content remains and null if all content could be skipped.\n     */\n    skipTailEdges(\n      nodeContext: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n    layoutFloatOrFootnote(\n      nodeContext: Vtree.NodeContext,\n    ): Task.Result<Vtree.NodeContext>;\n    /**\n     * Layout next portion of the source.\n     */\n    layoutNext(\n      nodeContext: Vtree.NodeContext,\n      leadingEdge: boolean,\n      forcedBreakValue?: string | null,\n    ): Task.Result<Vtree.NodeContext>;\n    clearOverflownViewNodes(\n      nodeContext: Vtree.NodeContext,\n      removeSelf: boolean,\n    ): void;\n    initGeom(): void;\n    init(): void;\n    /**\n     * Save the potential breaking position at the edge. Should, in general, save\n     * \"after\" position but only after skipping all of the \"before\" ones and\n     * getting to the non-empty content (to get breakAtEdge right).\n     */\n    saveEdgeBreakPosition(\n      position: Vtree.NodeContext,\n      breakAtEdge: string | null,\n      overflows: boolean,\n    ): void;\n    /**\n     * @param checkPoints array of breaking points for breakable block\n     */\n    saveBoxBreakPosition(checkPoints: Vtree.NodeContext[]): void;\n    updateMaxReachedAfterEdge(afterEdge: number): void;\n    /**\n     * @param chunkPosition starting position.\n     * @return holding end position.\n     */\n    layout(\n      chunkPosition: Vtree.ChunkPosition,\n      leadingEdge: boolean,\n      breakAfter?: string | null,\n    ): Task.Result<Vtree.ChunkPosition>;\n    isFullWithPageFloats(): boolean;\n    getMaxBlockSizeOfPageFloats(): number;\n    doFinishBreakOfFragmentLayoutConstraints(nodeContext): void;\n    /**\n     * @param nodeContext starting position.\n     * @return holding end position.\n     */\n    doLayout(\n      nodeContext: Vtree.NodeContext,\n      leadingEdge: boolean,\n      breakAfter?: string | null,\n    ): Task.Result<{\n      nodeContext: Vtree.NodeContext;\n      overflownNodeContext: Vtree.NodeContext;\n    }>;\n    /**\n     * Re-layout already laid-out chunks. Return the position of the last flow if\n     * there is an overflow.\n     * TODO: deal with chunks that did not fit at all.\n     * @return holding end position.\n     */\n    redoLayout(): Task.Result<Vtree.ChunkPosition>;\n    saveDistanceToBlockEndFloats(): void;\n    collectElementsOffset(): RepetitiveElement.ElementsOffset[];\n  }\n\n  export type SinglePageFloatLayoutResult = {\n    floatArea: PageFloatArea | null;\n    pageFloatFragment: PageFloats.PageFloatFragment | null;\n    newPosition: Vtree.ChunkPosition | null;\n  };\n\n  /**\n   * breaking point resolver for Text Node.\n   */\n  export interface TextNodeBreaker {\n    breakTextNode(\n      textNode: Text,\n      nodeContext: Vtree.NodeContext,\n      low: number,\n      checkPoints: Vtree.NodeContext[],\n      checkpointIndex: number,\n      force: boolean,\n    ): Vtree.NodeContext;\n    breakAfterSoftHyphen(\n      textNode: Text,\n      text: string,\n      viewIndex: number,\n      nodeContext: Vtree.NodeContext,\n    ): number;\n    breakAfterOtherCharacter(\n      textNode: Text,\n      text: string,\n      viewIndex: number,\n      nodeContext: Vtree.NodeContext,\n    ): number;\n    updateNodeContext(\n      nodeContext: Vtree.NodeContext,\n      viewIndex: number,\n      textNode: Text,\n    ): Vtree.NodeContext;\n  }\n\n  export interface LayoutMode {\n    doLayout(\n      nodeContext: Vtree.NodeContext,\n      column: Layout.Column,\n    ): Task.Result<Vtree.NodeContext>;\n    accept(nodeContext: Vtree.NodeContext, column: Layout.Column): boolean;\n    postLayout(\n      positionAfter: Vtree.NodeContext,\n      initialPosition: Vtree.NodeContext,\n      column: Layout.Column,\n      accepted: boolean,\n    ): boolean;\n  }\n\n  export interface PageFloatArea extends Column {\n    adjustContentRelativeSize: boolean;\n    readonly floatSide: string;\n    readonly parentContainer: Vtree.Container;\n\n    convertPercentageSizesToPx(target: Element): void;\n    fixFloatSizeAndPosition(nodeContext: Vtree.NodeContext): void;\n    getContentInlineSize(): number;\n  }\n}\n\nexport namespace LayoutProcessor {\n  export interface BlockFormattingContext extends Vtree.FormattingContext {}\n\n  export function isInstanceOfBlockFormattingContext(\n    object: Vtree.FormattingContext,\n  ): object is BlockFormattingContext {\n    return object && object.formattingContextType === \"Block\";\n  }\n}\n\nexport namespace Net {\n  export type Response = {\n    status: number;\n    statusText: string | null;\n    url: string;\n    contentType: string | null;\n    responseText: string | null;\n    responseXML: Document;\n    responseBlob: Blob;\n  };\n\n  export interface ResourceStore<Resource> {\n    resources: { [key: string]: Resource };\n    fetchers: { [key: string]: TaskUtil.Fetcher<Resource> };\n    readonly parser: (\n      p1: Response,\n      p2: ResourceStore<Resource>,\n    ) => Task.Result<Resource>;\n    readonly type: XMLHttpRequestResponseType;\n\n    /**\n     * @return resource for the given URL\n     */\n    load(\n      url: string,\n      opt_required?: boolean,\n      opt_message?: string,\n    ): Task.Result<Resource>;\n    /**\n     * @return fetcher for the resource for the given URL\n     */\n    fetch(\n      url: string,\n      opt_required?: boolean,\n      opt_message?: string,\n    ): TaskUtil.Fetcher<Resource>;\n    get(url: string): XmlDoc.XMLDocHolder;\n    delete(url: string): void;\n  }\n}\n\nexport namespace PageFloats {\n  /**\n   * @enum {string}\n   */\n  export enum FloatReference {\n    INLINE = \"inline\",\n    COLUMN = \"column\",\n    REGION = \"region\",\n    PAGE = \"page\",\n  }\n\n  export type PageFloatID = string;\n\n  export interface PageFloat {\n    order: number | null;\n    id: PageFloatID | null;\n    readonly nodePosition: Vtree.NodePosition;\n    readonly floatReference: FloatReference;\n    readonly floatSide: string;\n    readonly clearSide: string | null;\n    readonly flowName: string;\n    readonly floatMinWrapBlock: Css.Numeric | null;\n\n    getOrder(): number;\n    getId(): PageFloatID;\n    isAllowedOnContext(pageFloatLayoutContext: PageFloatLayoutContext): boolean;\n    isAllowedToPrecede(other: PageFloat): boolean;\n  }\n\n  export interface PageFloatFragment {\n    readonly floatReference: FloatReference;\n    readonly floatSide: string;\n    readonly continuations: PageFloatContinuation[];\n    readonly area: Vtree.Container;\n    readonly continues: boolean;\n\n    hasFloat(float: PageFloat): boolean;\n    findNotAllowedFloat(context: PageFloatLayoutContext): PageFloat | null;\n    getOuterShape(): GeometryUtil.Shape;\n    getOuterRect(): GeometryUtil.Rect;\n    getOrder(): number;\n    shouldBeStashedBefore(float: PageFloat): boolean;\n    addContinuations(continuations: PageFloatContinuation[]): void;\n    getFlowName(): string;\n  }\n\n  export interface PageFloatContinuation {\n    readonly float: PageFloat;\n    readonly nodePosition: Vtree.NodePosition;\n\n    equals(other: PageFloatContinuation | null): boolean;\n  }\n\n  export type PageFloatPlacementCondition = {\n    [key: string]: boolean;\n  };\n\n  export interface PageFloatLayoutContext {\n    writingMode: Css.Val;\n    direction: Css.Val;\n    floatFragments: PageFloatFragment[];\n    readonly parent: PageFloatLayoutContext;\n    readonly flowName: string | null;\n    readonly generatingNodePosition: Vtree.NodePosition | null;\n\n    getContainer(floatReference?: FloatReference): Vtree.Container;\n    setContainer(container: Vtree.Container);\n    addPageFloat(float: PageFloat): void;\n    getPageFloatLayoutContext(\n      floatReference: FloatReference,\n    ): PageFloatLayoutContext;\n    findPageFloatByNodePosition(\n      nodePosition: Vtree.NodePosition,\n    ): PageFloat | null;\n    isForbidden(float: PageFloat): boolean;\n    addPageFloatFragment(\n      floatFragment: PageFloatFragment,\n      dontInvalidate?: boolean,\n    ): void;\n    removePageFloatFragment(\n      floatFragment: PageFloatFragment,\n      dontInvalidate?: boolean,\n    ): void;\n    findPageFloatFragment(float: PageFloat): PageFloatFragment | null;\n    hasFloatFragments(condition?: (p1: PageFloatFragment) => boolean): boolean;\n    hasContinuingFloatFragmentsInFlow(flowName: string): boolean;\n    registerPageFloatAnchor(float: PageFloat, anchorViewNode: Node): void;\n    collectPageFloatAnchors(): any;\n    isAnchorAlreadyAppeared(floatId: PageFloatID): boolean;\n    deferPageFloat(continuation: PageFloatContinuation): void;\n    hasPrecedingFloatsDeferredToNext(\n      float: PageFloat,\n      ignoreReference?: boolean,\n    ): boolean;\n    getLastFollowingFloatInFragments(float: PageFloat): PageFloat | null;\n    getDeferredPageFloatContinuations(\n      flowName?: string | null,\n    ): PageFloatContinuation[];\n    getPageFloatContinuationsDeferredToNext(\n      flowName?: string | null,\n    ): PageFloatContinuation[];\n    getFloatsDeferredToNextInChildContexts(): PageFloat[];\n    checkAndForbidNotAllowedFloat(): boolean;\n    checkAndForbidFloatFollowingDeferredFloat(): boolean;\n    finish(): void;\n    hasSameContainerAs(other: PageFloatLayoutContext): boolean;\n    invalidate(): void;\n    detachChildren(): PageFloatLayoutContext[];\n    attachChildren(children: PageFloatLayoutContext[]): void;\n    isInvalidated(): boolean;\n    validate(): void;\n    removeEndFloatFragments(floatSide: string): void;\n    stashEndFloatFragments(float: PageFloat): void;\n    restoreStashedFragments(floatReference: FloatReference): void;\n    discardStashedFragments(floatReference: FloatReference): void;\n    getStashedFloatFragments(\n      floatReference: FloatReference,\n    ): PageFloatFragment[];\n    /**\n     * @param anchorEdge Null indicates that the anchor is not in the current\n     *     container.\n     * @return Logical float side (snap-block is resolved when init=false). Null\n     *     indicates that the float area does not fit inside the container\n     */\n    setFloatAreaDimensions(\n      area: Layout.PageFloatArea,\n      floatReference: FloatReference,\n      floatSide: string,\n      anchorEdge: number | null,\n      init: boolean,\n      force: boolean,\n      condition: PageFloatPlacementCondition,\n    ): string | null;\n    getFloatFragmentExclusions(): GeometryUtil.Shape[];\n    getMaxReachedAfterEdge(): number;\n    getBlockStartEdgeOfBlockEndFloats(): number;\n    getPageFloatClearEdge(clear: string, column: Layout.Column): number;\n    getPageFloatPlacementCondition(\n      float: PageFloat,\n      floatSide: string,\n      clearSide: string | null,\n    ): PageFloatPlacementCondition;\n    getLayoutConstraints(): Layout.LayoutConstraint[];\n    addLayoutConstraint(\n      layoutConstraint: Layout.LayoutConstraint,\n      floatReference: FloatReference,\n    ): void;\n    getMaxBlockSizeOfPageFloats(): number;\n    lock(): void;\n    unlock(): void;\n    isLocked(): boolean;\n  }\n\n  export interface PageFloatLayoutStrategy {\n    appliesToNodeContext(nodeContext: Vtree.NodeContext): boolean;\n    appliesToFloat(float: PageFloat): boolean;\n    createPageFloat(\n      nodeContext: Vtree.NodeContext,\n      pageFloatLayoutContext: PageFloatLayoutContext,\n      column: Layout.Column,\n    ): Task.Result<PageFloat>;\n    createPageFloatFragment(\n      continuations: PageFloatContinuation[],\n      floatSide: string,\n      floatArea: Layout.PageFloatArea,\n      continues: boolean,\n    ): PageFloatFragment;\n    findPageFloatFragment(\n      float: PageFloat,\n      pageFloatLayoutContext: PageFloatLayoutContext,\n    ): PageFloatFragment | null;\n    adjustPageFloatArea(\n      floatArea: Layout.PageFloatArea,\n      floatContainer: Vtree.Container,\n      column: Layout.Column,\n    );\n    forbid(float: PageFloat, pageFloatLayoutContext: PageFloatLayoutContext);\n  }\n}\n\nexport namespace Selectors {\n  export interface AfterIfContinues {\n    readonly sourceNode: Element;\n    readonly styler: PseudoElement.PseudoelementStyler;\n\n    createElement(\n      column: Layout.Column,\n      parentNodeContext: Vtree.NodeContext,\n    ): Task.Result<Element>;\n  }\n\n  export interface AfterIfContinuesLayoutConstraint\n    extends Layout.FragmentLayoutConstraint {\n    nodeContext: Vtree.NodeContext;\n    afterIfContinues: AfterIfContinues;\n    pseudoElementHeight: number;\n\n    getRepetitiveElements(): AfterIfContinuesElementsOffset;\n  }\n\n  export function isInstanceOfAfterIfContinuesLayoutConstraint(\n    object: Layout.FragmentLayoutConstraint,\n  ): object is AfterIfContinuesLayoutConstraint {\n    return object && object.flagmentLayoutConstraintType == \"AfterIfContinue\";\n  }\n\n  export interface AfterIfContinuesElementsOffset\n    extends RepetitiveElement.ElementsOffset {\n    nodeContext: Vtree.NodeContext;\n    pseudoElementHeight: number;\n\n    affectTo(nodeContext: Vtree.NodeContext): boolean;\n  }\n}\n\nexport namespace PseudoElement {\n  export interface PseudoelementStyler extends CssStyler.AbstractStyler {\n    contentProcessed: { [key: string]: boolean };\n    readonly element: Element;\n    style: CssCascade.ElementStyle;\n    styler: CssStyler.AbstractStyler;\n    readonly context: Exprs.Context;\n    readonly exprContentListener: Vtree.ExprContentListener;\n  }\n}\n\nexport namespace RepetitiveElement {\n  export interface RepetitiveElementsOwnerFormattingContext\n    extends Vtree.FormattingContext {\n    isRoot: boolean;\n    repetitiveElements: RepetitiveElements;\n    readonly parent: Vtree.FormattingContext;\n    readonly rootSourceNode: Element;\n    getRepetitiveElements(): RepetitiveElements;\n    getRootViewNode(position: Vtree.NodeContext): Element | null;\n    getRootNodeContext(\n      nodeContext: Vtree.NodeContext,\n    ): Vtree.NodeContext | null;\n    initializeRepetitiveElements(vertical: boolean): void;\n  }\n\n  export function isInstanceOfRepetitiveElementsOwnerFormattingContext(\n    object: Vtree.FormattingContext,\n  ): object is RepetitiveElementsOwnerFormattingContext {\n    if (!object) {\n      return false;\n    }\n    const type = object.formattingContextType;\n    return (\n      type === \"RepetitiveElementsOwner\" ||\n      Table.isInstanceOfTableFormattingContext(object)\n    ); // subset\n  }\n\n  export interface ElementsOffset {\n    calculateOffset(nodeContext: Vtree.NodeContext): number;\n    calculateMinimumOffset(nodeContext: Vtree.NodeContext): number;\n  }\n\n  export interface RepetitiveElements extends ElementsOffset {\n    isSkipHeader: boolean;\n    isSkipFooter: boolean;\n    enableSkippingFooter: boolean;\n    enableSkippingHeader: boolean;\n    doneInitialLayout: boolean;\n    firstContentSourceNode: Element | null;\n    lastContentSourceNode: Element | null;\n    allowInsert: boolean;\n    allowInsertRepeatitiveElements: boolean;\n    ownerSourceNode: Element;\n\n    setHeaderNodeContext(nodeContext: Vtree.NodeContext): void;\n    setFooterNodeContext(nodeContext: Vtree.NodeContext): void;\n    updateHeight(column: Layout.Column): void;\n    prepareLayoutFragment(): void;\n    appendHeaderToFragment(\n      rootNodeContext: Vtree.NodeContext,\n      firstChild: Node | null,\n      column: Layout.Column,\n    ): Task.Result<boolean>;\n    appendFooterToFragment(\n      rootNodeContext: Vtree.NodeContext,\n      firstChild: Node | null,\n      column: Layout.Column,\n    ): Task.Result<boolean>;\n    appendElementToFragment(\n      nodePosition: Vtree.NodePosition,\n      rootNodeContext: Vtree.NodeContext,\n      firstChild: Node | null,\n      column: Layout.Column,\n    ): Task.Result<boolean>;\n    moveChildren(from: Element, to: Element, firstChild: Node | null): void;\n    isAfterLastContent(nodeContext: Vtree.NodeContext): boolean;\n    isFirstContentNode(nodeContext: Vtree.NodeContext): boolean;\n    isEnableToUpdateState(): boolean;\n    updateState(): void;\n    preventSkippingHeader(): void;\n    preventSkippingFooter(): void;\n    isHeaderRegistered(): boolean;\n    isFooterRegistered(): boolean;\n    isHeaderSourceNode(node: Node): boolean;\n    isFooterSourceNode(node: Node): boolean;\n  }\n\n  export interface RepetitiveElementsOwnerLayoutConstraint\n    extends Layout.FragmentLayoutConstraint {\n    getRepetitiveElements(): RepetitiveElements;\n  }\n\n  export function isInstanceOfRepetitiveElementsOwnerLayoutConstraint(\n    object: Layout.FragmentLayoutConstraint,\n  ): object is RepetitiveElementsOwnerLayoutConstraint {\n    if (!object) {\n      return false;\n    }\n    const type = object.flagmentLayoutConstraintType;\n    return (\n      type === \"RepetitiveElementsOwner\" ||\n      Table.isInstanceOfTableRowLayoutConstraint(object)\n    ); // subset\n  }\n}\n\nexport namespace Table {\n  export interface TableFormattingContext\n    extends RepetitiveElement.RepetitiveElementsOwnerFormattingContext {\n    // FIXME\n  }\n\n  export function isInstanceOfTableFormattingContext(\n    object: Vtree.FormattingContext,\n  ): object is TableFormattingContext {\n    return object && object.formattingContextType === \"Table\";\n  }\n\n  export interface TableRowLayoutConstraint\n    extends RepetitiveElement.RepetitiveElementsOwnerLayoutConstraint {\n    cellFragmentLayoutConstraints: {\n      constraints: Layout.FragmentLayoutConstraint[];\n      breakPosition: Vtree.NodeContext;\n    }[];\n\n    removeDummyRowNodes(nodeContext: Vtree.NodeContext): void;\n    getElementsOffsetsForTableCell(\n      column: Layout.Column,\n    ): RepetitiveElement.ElementsOffset[];\n  }\n\n  export function isInstanceOfTableRowLayoutConstraint(\n    object: Layout.FragmentLayoutConstraint,\n  ): object is TableRowLayoutConstraint {\n    return object && object.flagmentLayoutConstraintType === \"TableRow\";\n  }\n}\n\nexport namespace Vtree {\n  export type ClientRect = {\n    left: number;\n    top: number;\n    right: number;\n    bottom: number;\n    width: number;\n    height: number;\n  };\n\n  /**\n   * Interface to read the position assigned to the elements and ranges by the\n   * browser.\n   */\n  export interface ClientLayout {\n    getRangeClientRects(range: Range): ClientRect[];\n    getElementClientRect(element: Element): ClientRect;\n    /**\n     * @return element's computed style\n     */\n    getElementComputedStyle(element: Element): CSSStyleDeclaration;\n  }\n\n  /**\n   * Styling, creating a single node's view, etc.\n   */\n  export interface LayoutContext {\n    /**\n     * Creates a functionally equivalent, but uninitialized layout context,\n     * suitable for building a separate column.\n     */\n    clone(): LayoutContext;\n    /**\n     * Set the current source node and create a view. Parameter firstTime\n     * is true (and possibly offsetInNode > 0) if node was broken on\n     * the previous page.\n     * @return true if children should be processed as well\n     */\n    setCurrent(\n      nodeContext: NodeContext,\n      firstTime: boolean,\n      atUnforcedBreak?: boolean,\n    ): Task.Result<boolean>;\n    /**\n     * Set the container element that holds view elements produced from the\n     * source.\n     */\n    setViewRoot(viewRoot: Element, isFootnote: boolean);\n    /**\n     * Moves to the next view node, creating it and appending it to the view tree\n     * if needed.\n     * @return that corresponds to the next view node\n     */\n    nextInTree(\n      nodeContext: NodeContext,\n      atUnforcedBreak?: boolean,\n    ): Task.Result<NodeContext>;\n    /**\n     * Apply pseudo-element styles (if any).\n     * @param target element to apply styles to\n     */\n    applyPseudoelementStyle(\n      nodeContext: NodeContext,\n      pseudoName: string,\n      target: Element,\n    ): void;\n    /**\n     * Apply styles to footnote container.\n     * @param target element to apply styles to\n     * @return vertical\n     */\n    applyFootnoteStyle(\n      vertical: boolean,\n      rtl: boolean,\n      target: Element,\n    ): boolean;\n    /**\n     * Peel off innermost first-XXX pseudoelement, create and create view nodes\n     * after the end of that pseudoelement.\n     */\n    peelOff(\n      nodeContext: NodeContext,\n      nodeOffset: number,\n    ): Task.Result<NodeContext>;\n    /**\n     * Process a block-end edge of a fragmented block.\n     */\n    processFragmentedBlockEdge(nodeContext: NodeContext);\n    convertLengthToPx(\n      numeric: Css.Numeric,\n      viewNode: Node,\n      clientLayout: ClientLayout,\n    ): number | Css.Numeric;\n    /**\n     * Returns if two NodePositions represents the same position in the document.\n     */\n    isSameNodePosition(\n      nodePosition1: NodePosition,\n      nodePosition2: NodePosition,\n    ): boolean;\n    addEventListener(\n      type: string,\n      listener: Base.EventListener,\n      capture?: boolean,\n    ): void;\n    removeEventListener(\n      type: string,\n      listener: Base.EventListener,\n      capture?: boolean,\n    ): void;\n    dispatchEvent(evt: Base.Event): void;\n  }\n\n  /**\n   * Formatting context.\n   */\n  export interface FormattingContext {\n    formattingContextType: FormattingContextType;\n    getName(): string;\n    isFirstTime(nodeContext: NodeContext, firstTime: boolean): boolean;\n    getParent(): FormattingContext;\n    saveState(): any;\n    restoreState(state: any);\n  }\n\n  export type NodePositionStep = {\n    node: Node;\n    shadowType: ShadowType;\n    shadowContext: ShadowContext | null;\n    nodeShadow: ShadowContext | null;\n    shadowSibling: NodePositionStep | null;\n    formattingContext: FormattingContext | null;\n    fragmentIndex: number;\n  };\n\n  export type NodePosition = {\n    steps: NodePositionStep[];\n    offsetInNode: number;\n    after: boolean;\n    preprocessedTextContent: Diff.Change[] | null;\n  };\n\n  /**\n   * Handling of purely whitespace sequences between blocks\n   * @enum {number}\n   */\n  export enum Whitespace {\n    /**\n     * Whitespace sequence between blocks is ignored\n     */\n    IGNORE,\n    /**\n     * Whitespace sequence between blocks is ignored unless it containes newline\n     */\n    NEWLINE,\n    /**\n     * Whitespace sequence between blocks is preserved\n     */\n    PRESERVE,\n  }\n\n  export interface Container {\n    left: number;\n    top: number;\n    marginLeft: number;\n    marginRight: number;\n    marginTop: number;\n    marginBottom: number;\n    borderLeft: number;\n    borderRight: number;\n    borderTop: number;\n    borderBottom: number;\n    paddingLeft: number;\n    paddingRight: number;\n    paddingTop: number;\n    paddingBottom: number;\n    width: number;\n    height: number;\n    originX: number;\n    originY: number;\n    exclusions: GeometryUtil.Shape[];\n    innerShape: GeometryUtil.Shape;\n    computedBlockSize: number;\n    snapWidth: number;\n    snapHeight: number;\n    snapOffsetX: number;\n    snapOffsetY: number;\n    vertical: boolean; // vertical writing\n    element: Element;\n\n    getInsetTop(): number;\n    getInsetBottom(): number;\n    getInsetLeft(): number;\n    getInsetRight(): number;\n    getInsetBefore(): number;\n    getInsetAfter(): number;\n    getInsetStart(): number;\n    getInsetEnd(): number;\n    getBeforeEdge(box: ClientRect): number;\n    getAfterEdge(box: ClientRect): number;\n    getStartEdge(box: ClientRect): number;\n    getEndEdge(box: ClientRect): number;\n    getInlineSize(box: ClientRect): number;\n    getBoxSize(box: ClientRect): number;\n    getBoxDir(): number;\n    getInlineDir(): number;\n    copyFrom(other: Container): void;\n    setVerticalPosition(top: number, height: number): void;\n    setHorizontalPosition(left: number, width: number): void;\n    setBlockPosition(start: number, extent: number): void;\n    setInlinePosition(start: number, extent: number): void;\n    clear(): void;\n    getInnerShape(): GeometryUtil.Shape;\n    getInnerRect(): GeometryUtil.Rect;\n    getPaddingRect(): GeometryUtil.Rect;\n    getOuterShape(\n      outerShapeProp: Css.Val,\n      context: Exprs.Context,\n    ): GeometryUtil.Shape;\n    getOuterRect(): GeometryUtil.Rect;\n  }\n\n  /**\n   * @enum {number}\n   */\n  export enum ShadowType {\n    NONE,\n    CONTENT,\n    ROOTLESS,\n    ROOTED,\n  }\n\n  /**\n   * Data about shadow tree instance.\n   */\n  export interface ShadowContext {\n    readonly owner: Element;\n    readonly root: Element;\n    readonly xmldoc: XmlDoc.XMLDocHolder;\n    readonly parentShadow: ShadowContext;\n    subShadow: ShadowContext;\n    readonly type: Vtree.ShadowType;\n    readonly styler: object;\n\n    equals(other: ShadowContext): boolean;\n  }\n\n  /**\n   * Information about :first-letter or :first-line pseudoelements\n   * @param count 0 - first-letter, 1 or more - first line(s)\n   */\n  export interface FirstPseudo {\n    readonly outer: FirstPseudo;\n    readonly count: number;\n  }\n\n  /**\n   * NodeContext represents a position in the document + layout-related\n   * information attached to it. When after=false and offsetInNode=0, the\n   * position is inside the element (node), but just before its first child.\n   * When offsetInNode>0 it represents offset in the textual content of the\n   * node. When after=true it represents position right after the last child\n   * of the node. boxOffset is incremented by 1 for any valid node position.\n   */\n  export interface NodeContext {\n    // position itself\n    offsetInNode: number;\n    after: boolean;\n    shadowType: ShadowType; // parent's shadow type\n    shadowContext: Vtree.ShadowContext;\n    nodeShadow: Vtree.ShadowContext;\n    shadowSibling: NodeContext; // next \"sibling\" in the shadow tree\n    // other stuff\n    shared: boolean;\n    inline: boolean;\n    overflow: boolean;\n    breakPenalty: number;\n    display: string | null;\n    floatReference: PageFloats.FloatReference;\n    floatSide: string | null;\n    clearSide: string | null;\n    floatMinWrapBlock: Css.Numeric | null;\n    columnSpan: Css.Val | null;\n    verticalAlign: string;\n    captionSide: string;\n    inlineBorderSpacing: number;\n    blockBorderSpacing: number;\n    flexContainer: boolean;\n    whitespace: Whitespace;\n    hyphenateCharacter: string | null;\n    breakWord: boolean;\n    establishesBFC: boolean;\n    containingBlockForAbsolute: boolean;\n    breakBefore: string | null;\n    breakAfter: string | null;\n    viewNode: Node;\n    clearSpacer: Node;\n    inheritedProps: { [key: string]: number | string | Css.Val };\n    vertical: boolean;\n    direction: string;\n    firstPseudo: FirstPseudo;\n    lang: string | null;\n    preprocessedTextContent: Diff.Change[] | null;\n    formattingContext: FormattingContext;\n    repeatOnBreak: string | null;\n    pluginProps: {\n      [key: string]: string | number | undefined | null | (number | null)[];\n    };\n    fragmentIndex: number;\n    afterIfContinues: Selectors.AfterIfContinues;\n    footnotePolicy: Css.Ident | null;\n\n    sourceNode: Node;\n    parent: NodeContext;\n    boxOffset: number;\n\n    resetView(): void;\n    modify(): NodeContext;\n    copy(): NodeContext;\n    clone(): NodeContext;\n    toNodePositionStep(): NodePositionStep;\n    toNodePosition(): NodePosition;\n    isInsideBFC(): boolean;\n    getContainingBlockForAbsolute(): NodeContext;\n    /**\n     * Walk up NodeContext tree (starting from itself) and call the callback for\n     * each block.\n     */\n    walkUpBlocks(callback: (p1: NodeContext) => any): void;\n    belongsTo(formattingContext: FormattingContext): boolean;\n  }\n\n  export interface ChunkPosition {\n    floats: NodePosition[];\n    primary: NodePosition;\n\n    clone(): ChunkPosition;\n    isSamePosition(other: ChunkPosition): boolean;\n  }\n\n  export type ExprContentListener = (\n    p1: Exprs.Val,\n    p2: string,\n    p3: Document,\n  ) => Node | null;\n}\n\nexport namespace XmlDoc {\n  export interface XMLDocHolder {\n    lang: string | null;\n    totalOffset: number;\n    root: Element;\n    body: Element;\n    head: Element;\n    last: Element;\n    lastOffset: number;\n    idMap: { [key: string]: Element };\n    readonly store: XMLDocStore;\n    readonly url: string;\n    readonly document: Document;\n\n    doc(): NodeList;\n    getElementOffset(element: Element): number;\n    getNodeOffset(srcNode: Node, offsetInNode: number, after: boolean): number;\n    getTotalOffset(): number;\n    /**\n     * @return last node such that its offset is less or equal to the given\n     */\n    getNodeByOffset(offset: number): Node;\n    /**\n     * Get element by URL in the source document(s). URL must be in either '#id'\n     * or 'url#id' form.\n     */\n    getElement(url: string): Element | null;\n  }\n\n  export interface Predicate {\n    readonly fn: (p1: Node) => boolean;\n\n    check(node: Node): boolean;\n    withAttribute(name: string, value: string): Predicate;\n    withChild(name: string, opt_childPredicate?: Predicate): Predicate;\n  }\n\n  export interface NodeList {\n    readonly nodes: Node[];\n\n    asArray(): Node[];\n    size(): number;\n    /**\n     * Filter with predicate\n     */\n    predicate(pr: Predicate): NodeList;\n    forEachNode(fn: (p1: Node, p2: (p1: Node) => void) => void): NodeList;\n    forEach<T>(fn: (p1: Node) => T): T[];\n    forEachNonNull<T>(fn: (p1: Node) => T): T[];\n    child(tag: string): NodeList;\n    childElements(): NodeList;\n    attribute(name: string): (string | null)[];\n    textContent(): (string | null)[];\n  }\n\n  export type XMLDocStore = Net.ResourceStore<XMLDocHolder>;\n}\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Diff utility\n */\n\nimport fastdiff from \"fast-diff\";\n\nexport type Change = (number | string)[];\n\nexport function diffChars(originalText: string, newText: string): Change[] {\n  return fastdiff(originalText, newText, 0);\n}\n\n/**\n * @returns string\n */\nexport function restoreOriginalText(changes: Change[]): any {\n  return changes.reduce((result, item) => {\n    if (item[0] === fastdiff.INSERT) {\n      return result;\n    }\n    return result + item[1];\n  }, \"\");\n}\n\n/**\n * @returns string\n */\nexport function restoreNewText(changes: Change[]): any {\n  return changes.reduce((result, item) => {\n    if (item[0] === fastdiff.DELETE) {\n      return result;\n    }\n    return result + item[1];\n  }, \"\");\n}\n\nexport function resolveNewIndex(changes: Change[], oldIndex: number): number {\n  return resolveIndex(changes, oldIndex, 1);\n}\n\nexport function resolveOriginalIndex(\n  changes: Change[],\n  newIndex: number,\n): number {\n  return resolveIndex(changes, newIndex, -1);\n}\n\nexport function resolveIndex(\n  changes: Change[],\n  index: number,\n  coef: number,\n): number {\n  let diff = 0;\n  let current = 0;\n  changes.some((change) => {\n    for (let i = 0; i < (change[1] as string).length; i++) {\n      switch ((change[0] as number) * coef) {\n        case fastdiff.INSERT:\n          diff++;\n          break;\n        case fastdiff.DELETE:\n          diff--;\n          current++;\n          break;\n        case fastdiff.EQUAL:\n          current++;\n          break;\n      }\n      if (current > index) {\n        return true;\n      }\n    }\n    return false;\n  });\n  return Math.max(Math.min(index, current - 1) + diff, 0);\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Vtree - Basic view tree data structures and support utilities.\n */\nimport * as Base from \"./base\";\nimport * as Constants from \"./constants\";\nimport * as Css from \"./css\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as Diff from \"./diff\";\nimport * as Exprs from \"./exprs\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as TaskUtil from \"./task-util\";\nimport { assert } from \"./asserts\";\nimport { PageFloats, Selectors, Vtree, XmlDoc } from \"./types\";\n\nexport const delayedProps = {\n  transform: true,\n  \"transform-origin\": true,\n};\n\nexport const delayedPropsIfRelativePositioned = {\n  top: true,\n  bottom: true,\n  left: true,\n  right: true,\n};\n\nexport class DelayedItem {\n  constructor(\n    public target: Element,\n    public name: string,\n    public value: Css.Val,\n  ) {}\n}\n\nexport type PageHyperlinkEvent = {\n  type: string;\n  target;\n  currentTarget;\n  anchorElement: Element;\n  href: string;\n};\n\nexport type Trigger = {\n  observer: string;\n  event: string;\n  action: string;\n  ref: string;\n};\n\nexport const actions = {\n  show: function(obj) {\n    obj.style.visibility = \"visible\";\n  },\n  hide: function(obj) {\n    obj.style.visibility = \"hidden\";\n  },\n  play: function(obj) {\n    obj.currentTime = 0;\n    obj.play();\n  },\n  pause: function(obj) {\n    obj.pause();\n  },\n  resume: function(obj) {\n    obj.play();\n  },\n  mute: function(obj) {\n    obj.muted = true;\n  },\n  unmute: function(obj) {\n    obj.muted = false;\n  },\n};\n\nexport function makeListener(\n  refs: Element[],\n  action: string,\n): EventListener | null {\n  const actionFn = actions[action];\n  if (actionFn) {\n    return () => {\n      for (let k = 0; k < refs.length; k++) {\n        try {\n          actionFn(refs[k]);\n        } catch (err) {}\n      }\n    };\n  }\n  return null;\n}\n\nexport class Page extends Base.SimpleEventTarget {\n  private static AUTO_PAGE_WIDTH_ATTRIBUTE: string =\n    \"data-vivliostyle-auto-page-width\";\n  private static AUTO_PAGE_HEIGHT_ATTRIBUTE: string =\n    \"data-vivliostyle-auto-page-height\";\n  pageAreaElement: HTMLElement | null = null;\n  delayedItems: DelayedItem[] = [];\n  hrefHandler: (e: Event) => void;\n  elementsById: { [key: string]: Element[] } = {};\n  dimensions: { width: number; height: number } = { width: 0, height: 0 };\n  isFirstPage: boolean = false;\n  isLastPage: boolean = false;\n  isAutoPageWidth: boolean = true;\n  isAutoPageHeight: boolean = true;\n  spineIndex: number = 0;\n  position: LayoutPosition = null;\n  offset: number = -1;\n  side: Constants.PageSide | null = null;\n  fetchers: TaskUtil.Fetcher<{}>[] = [];\n  marginBoxes: {\n    top: { [key: string]: Container };\n    bottom: { [key: string]: Container };\n    left: { [key: string]: Container };\n    right: { [key: string]: Container };\n  } = { top: {}, bottom: {}, left: {}, right: {} };\n\n  constructor(\n    public readonly container: HTMLElement,\n    public readonly bleedBox: HTMLElement,\n  ) {\n    super();\n    const self = this;\n    this.hrefHandler = (e: Event) => {\n      const anchorElement = e.currentTarget as Element;\n      const href =\n        anchorElement.getAttribute(\"href\") ||\n        anchorElement.getAttributeNS(Base.NS.XLINK, \"href\");\n      if (href) {\n        const evt = {\n          type: \"hyperlink\",\n          target: null,\n          currentTarget: null,\n          anchorElement,\n          href,\n          preventDefault() {\n            e.preventDefault();\n          },\n        };\n        self.dispatchEvent(evt);\n      }\n    };\n  }\n\n  setAutoPageWidth(isAuto: boolean) {\n    this.isAutoPageWidth = isAuto;\n    if (isAuto) {\n      this.container.setAttribute(Page.AUTO_PAGE_WIDTH_ATTRIBUTE, \"true\");\n    } else {\n      this.container.removeAttribute(Page.AUTO_PAGE_WIDTH_ATTRIBUTE);\n    }\n  }\n\n  setAutoPageHeight(isAuto: boolean) {\n    this.isAutoPageHeight = isAuto;\n    if (isAuto) {\n      this.container.setAttribute(Page.AUTO_PAGE_HEIGHT_ATTRIBUTE, \"true\");\n    } else {\n      this.container.removeAttribute(Page.AUTO_PAGE_HEIGHT_ATTRIBUTE);\n    }\n  }\n\n  registerElementWithId(element: Element, id: string) {\n    const arr = this.elementsById[id];\n    if (!arr) {\n      this.elementsById[id] = [element];\n    } else {\n      arr.push(element);\n    }\n  }\n\n  finish(triggers: Trigger[], clientLayout: ClientLayout): void {\n    // Remove ID of elements which eventually did not fit in the page\n    // (Some nodes may have been removed after registration if they did not fit\n    // in the page)\n    Object.keys(this.elementsById).forEach((id) => {\n      const elems = this.elementsById[id];\n      for (let i = 0; i < elems.length; ) {\n        if (this.container.contains(elems[i])) {\n          i++;\n        } else {\n          elems.splice(i, 1);\n        }\n      }\n      if (elems.length === 0) {\n        delete this.elementsById[id];\n      }\n    });\n    const list = this.delayedItems;\n    for (let i = 0; i < list.length; i++) {\n      const item = list[i];\n      if (\n        item.target === this.container &&\n        item.name === \"transform\" &&\n        !this.isAutoPageWidth &&\n        !this.isAutoPageHeight\n      ) {\n        // When fixed page size is specified, cancel the transform property\n        // set at OPFView.makePage() for the specified viewport size\n        // (e.g. `<meta name=\"viewport\" content=\"width=1307, height=1920\"/>`)\n        // to avoid wrong page resizing.\n        continue;\n      }\n      Base.setCSSProperty(item.target, item.name, item.value.toString());\n    }\n\n    // use size of the container of the PageMasterInstance\n    const rect = clientLayout.getElementClientRect(this.container);\n    this.dimensions.width = rect.width;\n    this.dimensions.height = rect.height;\n    for (let i = 0; i < triggers.length; i++) {\n      const trigger = triggers[i];\n      const refs = this.elementsById[trigger.ref];\n      const observers = this.elementsById[trigger.observer];\n      if (refs && observers) {\n        const listener = makeListener(refs, trigger.action);\n        if (listener) {\n          for (let k = 0; k < observers.length; k++) {\n            observers[k].addEventListener(trigger.event, listener, false);\n          }\n        }\n      }\n    }\n  }\n\n  /**\n   * Zoom page.\n   * @param scale Factor to which the page will be scaled.\n   */\n  zoom(scale: number) {\n    Base.setCSSProperty(this.container, \"transform\", `scale(${scale})`);\n  }\n\n  /**\n   * Returns the page area element.\n   */\n  getPageAreaElement(): HTMLElement {\n    return this.pageAreaElement || this.container;\n  }\n}\n\nexport type Spread = {\n  left: Page;\n  right: Page;\n};\n\n/**\n * Marks an element as \"special\". It should not be used in bbox calculations.\n */\nexport const SPECIAL_ATTR = \"data-adapt-spec\";\n\nexport const Whitespace = Vtree.Whitespace;\nexport type Whitespace = Vtree.Whitespace;\n\n/**\n * Resolves Whitespace value from a value of 'white-space' property\n * @param whitespace The value of 'white-space' property\n */\nexport function whitespaceFromPropertyValue(\n  whitespace: string,\n): Whitespace | null {\n  switch (whitespace) {\n    case \"normal\":\n    case \"nowrap\":\n      return Whitespace.IGNORE;\n    case \"pre-line\":\n      return Whitespace.NEWLINE;\n    case \"pre\":\n    case \"pre-wrap\":\n      return Whitespace.PRESERVE;\n    default:\n      return null;\n  }\n}\n\nexport function canIgnore(node: Node, whitespace: Whitespace): boolean {\n  if (node.nodeType == 1) {\n    return false;\n  }\n  const text = node.textContent;\n  switch (whitespace) {\n    case Whitespace.IGNORE:\n      return !!text.match(/^\\s*$/);\n    case Whitespace.NEWLINE:\n      return !!text.match(/^[ \\t\\f]*$/);\n    case Whitespace.PRESERVE:\n      return text.length == 0;\n  }\n  throw new Error(`Unexpected whitespace: ${whitespace}`);\n}\n\nexport class Flow {\n  forcedBreakOffsets = [] as number[];\n  formattingContext: FormattingContext | null = null;\n\n  constructor(\n    public readonly flowName: string,\n    public readonly parentFlowName: string | null,\n  ) {}\n}\n\nexport class FlowChunk {\n  startPage: number = -1;\n\n  constructor(\n    public flowName: string,\n    public element: Element,\n    public startOffset: number,\n    public priority: number,\n    public linger: number,\n    public exclusive: boolean,\n    public repeated: boolean,\n    public last: boolean,\n    public breakBefore: string | null,\n  ) {}\n\n  isBetter(other: FlowChunk): boolean {\n    if (!this.exclusive) {\n      return false;\n    }\n    if (!other.exclusive) {\n      return true;\n    }\n    if (this.priority > other.priority) {\n      return true;\n    }\n    return this.last;\n  }\n}\n\nexport type ClientRect = Vtree.ClientRect;\n\nexport function clientrectIncreasingTop(\n  r1: ClientRect,\n  r2: ClientRect,\n): number {\n  return r1.top - r2.top;\n}\n\nexport function clientrectDecreasingRight(\n  r1: ClientRect,\n  r2: ClientRect,\n): number {\n  return r2.right - r1.right;\n}\n\n/**\n * Interface to read the position assigned to the elements and ranges by the\n * browser.\n */\nexport type ClientLayout = Vtree.ClientLayout;\n\n/**\n * Styling, creating a single node's view, etc.\n */\nexport type LayoutContext = Vtree.LayoutContext;\n\n/**\n * Formatting context.\n */\nexport type FormattingContext = Vtree.FormattingContext;\n\nexport function eachAncestorFormattingContext(\n  nodeContext: NodeContext,\n  callback: (p1: FormattingContext) => any,\n): void {\n  if (!nodeContext) {\n    return;\n  }\n  for (let fc = nodeContext.formattingContext; fc; fc = fc.getParent()) {\n    callback(fc);\n  }\n}\n\nexport type NodePositionStep = Vtree.NodePositionStep;\n\nexport function isSameNodePositionStep(\n  nps1: NodePositionStep,\n  nps2: NodePositionStep,\n): boolean {\n  if (nps1 === nps2) {\n    return true;\n  }\n  if (!nps1 || !nps2) {\n    return false;\n  }\n  return (\n    nps1.node === nps2.node &&\n    nps1.shadowType === nps2.shadowType &&\n    isSameShadowContext(nps1.shadowContext, nps2.shadowContext) &&\n    isSameShadowContext(nps1.nodeShadow, nps2.nodeShadow) &&\n    isSameNodePositionStep(nps1.shadowSibling, nps2.shadowSibling)\n  );\n}\n\nexport type NodePosition = Vtree.NodePosition;\n\nexport function isSameNodePosition(\n  np1: NodePosition | null,\n  np2: NodePosition | null,\n): boolean {\n  if (np1 === np2) {\n    return true;\n  }\n  if (!np1 || !np2) {\n    return false;\n  }\n  if (\n    np1.offsetInNode !== np2.offsetInNode ||\n    np1.after !== np2.after ||\n    np1.steps.length !== np2.steps.length\n  ) {\n    return false;\n  }\n  for (let i = 0; i < np1.steps.length; i++) {\n    if (!isSameNodePositionStep(np1.steps[i], np2.steps[i])) {\n      return false;\n    }\n  }\n  return true;\n}\n\nexport function newNodePositionFromNode(node: Node): NodePosition {\n  const step: NodePositionStep = {\n    node,\n    shadowType: ShadowType.NONE,\n    shadowContext: null,\n    nodeShadow: null,\n    shadowSibling: null,\n    formattingContext: null,\n    fragmentIndex: 0,\n  };\n  return {\n    steps: [step],\n    offsetInNode: 0,\n    after: false,\n    preprocessedTextContent: null,\n  };\n}\n\nexport function newNodePositionFromNodeContext(\n  nodeContext: Vtree.NodeContext,\n  initialFragmentIndex: number | null,\n): NodePosition {\n  const step: NodePositionStep = {\n    node: nodeContext.sourceNode,\n    shadowType: ShadowType.NONE,\n    shadowContext: nodeContext.shadowContext,\n    nodeShadow: null,\n    shadowSibling: null,\n    formattingContext: null,\n    fragmentIndex:\n      initialFragmentIndex != null\n        ? initialFragmentIndex\n        : nodeContext.fragmentIndex,\n  };\n  return {\n    steps: [step],\n    offsetInNode: 0,\n    after: false,\n    preprocessedTextContent: nodeContext.preprocessedTextContent,\n  };\n}\n\nexport function makeNodeContextFromNodePositionStep(\n  step: NodePositionStep,\n  parent: Vtree.NodeContext,\n): NodeContext {\n  const nodeContext = new NodeContext(step.node, parent as NodeContext, 0);\n  nodeContext.shadowType = step.shadowType;\n  nodeContext.shadowContext = step.shadowContext;\n  nodeContext.nodeShadow = step.nodeShadow;\n  nodeContext.shadowSibling = step.shadowSibling\n    ? makeNodeContextFromNodePositionStep(step.shadowSibling, parent.copy())\n    : null;\n  nodeContext.formattingContext = step.formattingContext;\n  nodeContext.fragmentIndex = step.fragmentIndex + 1;\n  return nodeContext;\n}\n\nexport const ShadowType = Vtree.ShadowType;\nexport type ShadowType = Vtree.ShadowType;\n\n/**\n * Data about shadow tree instance.\n */\nexport class ShadowContext implements Vtree.ShadowContext {\n  subShadow: ShadowContext = null;\n\n  constructor(\n    public readonly owner: Element,\n    public readonly root: Element,\n    public readonly xmldoc: XmlDoc.XMLDocHolder,\n    public readonly parentShadow: ShadowContext,\n    superShadow: ShadowContext,\n    public readonly type: ShadowType,\n    public readonly styler: object,\n  ) {\n    if (superShadow) {\n      superShadow.subShadow = this;\n    }\n  }\n\n  equals(other: ShadowContext): boolean {\n    if (!other) {\n      return false;\n    }\n    return (\n      this.owner === other.owner &&\n      this.xmldoc === other.xmldoc &&\n      this.type === other.type &&\n      isSameShadowContext(this.parentShadow, other.parentShadow)\n    );\n  }\n}\n\nexport function isSameShadowContext(\n  sc1: ShadowContext,\n  sc2: ShadowContext,\n): boolean {\n  return sc1 === sc2 || (!!sc1 && !!sc2 && sc1.equals(sc2));\n}\n\n/**\n * Information about :first-letter or :first-line pseudoelements\n * @param count 0 - first-letter, 1 or more - first line(s)\n */\nexport class FirstPseudo implements Vtree.FirstPseudo {\n  constructor(\n    public readonly outer: FirstPseudo,\n    public readonly count: number,\n  ) {}\n}\n\n/**\n * NodeContext represents a position in the document + layout-related\n * information attached to it. When after=false and offsetInNode=0, the\n * position is inside the element (node), but just before its first child.\n * When offsetInNode>0 it represents offset in the textual content of the\n * node. When after=true it represents position right after the last child\n * of the node. boxOffset is incremented by 1 for any valid node position.\n */\nexport class NodeContext implements Vtree.NodeContext {\n  // position itself\n  offsetInNode: number = 0;\n  after: boolean = false;\n  shadowType: ShadowType;\n\n  // parent's shadow type\n  shadowContext: ShadowContext;\n  nodeShadow: ShadowContext = null;\n  shadowSibling: NodeContext = null;\n\n  // next \"sibling\" in the shadow tree\n  // other stuff\n  shared: boolean = false;\n  inline: boolean = true;\n  overflow: boolean = false;\n  breakPenalty: number;\n  display: string | null = null;\n  floatReference: PageFloats.FloatReference;\n  floatSide: string | null = null;\n  clearSide: string | null = null;\n  floatMinWrapBlock: Css.Numeric | null = null;\n  columnSpan: Css.Val | null = null;\n  verticalAlign: string = \"baseline\";\n  captionSide: string = \"top\";\n  inlineBorderSpacing: number = 0;\n  blockBorderSpacing: number = 0;\n  flexContainer: boolean = false;\n  whitespace: Whitespace;\n  hyphenateCharacter: string | null;\n  breakWord: boolean;\n  establishesBFC: boolean = false;\n  containingBlockForAbsolute: boolean = false;\n  breakBefore: string | null = null;\n  breakAfter: string | null = null;\n  viewNode: Node = null;\n  clearSpacer: Node = null;\n  inheritedProps: { [key: string]: number | string | Css.Val };\n  vertical: boolean;\n  direction: string;\n  firstPseudo: FirstPseudo;\n  lang: string | null = null;\n  preprocessedTextContent: Diff.Change[] | null = null;\n  formattingContext: FormattingContext;\n  repeatOnBreak: string | null = null;\n  pluginProps: {\n    [key: string]: string | number | undefined | null | (number | null)[];\n  } = {};\n  fragmentIndex: number = 1;\n  afterIfContinues: Selectors.AfterIfContinues = null;\n  footnotePolicy: Css.Ident | null = null;\n\n  constructor(\n    public sourceNode: Node,\n    public parent: NodeContext,\n    public boxOffset: number,\n  ) {\n    this.shadowType = ShadowType.NONE;\n    this.shadowContext = parent ? parent.shadowContext : null;\n    this.breakPenalty = parent ? parent.breakPenalty : 0;\n    this.floatReference = PageFloats.FloatReference.INLINE;\n    this.whitespace = parent ? parent.whitespace : Whitespace.IGNORE;\n    this.hyphenateCharacter = parent ? parent.hyphenateCharacter : null;\n    this.breakWord = parent ? parent.breakWord : false;\n    this.inheritedProps = parent ? parent.inheritedProps : {};\n    this.vertical = parent ? parent.vertical : false;\n    this.direction = parent ? parent.direction : \"ltr\";\n    this.firstPseudo = parent ? parent.firstPseudo : null;\n    this.formattingContext = parent ? parent.formattingContext : null;\n  }\n\n  resetView(): void {\n    this.inline = true;\n    this.breakPenalty = this.parent ? this.parent.breakPenalty : 0;\n    this.viewNode = null;\n    this.clearSpacer = null;\n    this.offsetInNode = 0;\n    this.after = false;\n    this.display = null;\n    this.floatReference = PageFloats.FloatReference.INLINE;\n    this.floatSide = null;\n    this.clearSide = null;\n    this.floatMinWrapBlock = null;\n    this.columnSpan = null;\n    this.verticalAlign = \"baseline\";\n    this.flexContainer = false;\n    this.whitespace = this.parent ? this.parent.whitespace : Whitespace.IGNORE;\n    this.hyphenateCharacter = this.parent\n      ? this.parent.hyphenateCharacter\n      : null;\n    this.breakWord = this.parent ? this.parent.breakWord : false;\n    this.breakBefore = null;\n    this.breakAfter = null;\n    this.nodeShadow = null;\n    this.establishesBFC = false;\n    this.containingBlockForAbsolute = false;\n    this.vertical = this.parent ? this.parent.vertical : false;\n    this.nodeShadow = null;\n    this.preprocessedTextContent = null;\n    this.formattingContext = this.parent ? this.parent.formattingContext : null;\n    this.repeatOnBreak = null;\n    this.pluginProps = {};\n    this.fragmentIndex = 1;\n    this.afterIfContinues = null;\n    this.footnotePolicy = null;\n  }\n\n  private cloneItem(): NodeContext {\n    const np = new NodeContext(this.sourceNode, this.parent, this.boxOffset);\n    np.offsetInNode = this.offsetInNode;\n    np.after = this.after;\n    np.nodeShadow = this.nodeShadow;\n    np.shadowType = this.shadowType;\n    np.shadowContext = this.shadowContext;\n    np.shadowSibling = this.shadowSibling;\n    np.inline = this.inline;\n    np.breakPenalty = this.breakPenalty;\n    np.display = this.display;\n    np.floatReference = this.floatReference;\n    np.floatSide = this.floatSide;\n    np.clearSide = this.clearSide;\n    np.floatMinWrapBlock = this.floatMinWrapBlock;\n    np.columnSpan = this.columnSpan;\n    np.verticalAlign = this.verticalAlign;\n    np.captionSide = this.captionSide;\n    np.inlineBorderSpacing = this.inlineBorderSpacing;\n    np.blockBorderSpacing = this.blockBorderSpacing;\n    np.establishesBFC = this.establishesBFC;\n    np.containingBlockForAbsolute = this.containingBlockForAbsolute;\n    np.flexContainer = this.flexContainer;\n    np.whitespace = this.whitespace;\n    np.hyphenateCharacter = this.hyphenateCharacter;\n    np.breakWord = this.breakWord;\n    np.breakBefore = this.breakBefore;\n    np.breakAfter = this.breakAfter;\n    np.viewNode = this.viewNode;\n    np.clearSpacer = this.clearSpacer;\n    np.firstPseudo = this.firstPseudo;\n    np.vertical = this.vertical;\n    np.overflow = this.overflow;\n    np.preprocessedTextContent = this.preprocessedTextContent;\n    np.formattingContext = this.formattingContext;\n    np.repeatOnBreak = this.repeatOnBreak;\n    np.pluginProps = Object.create(this.pluginProps);\n    np.fragmentIndex = this.fragmentIndex;\n    np.afterIfContinues = this.afterIfContinues;\n    np.footnotePolicy = this.footnotePolicy;\n    return np;\n  }\n\n  modify(): NodeContext {\n    if (!this.shared) {\n      return this;\n    }\n    return this.cloneItem();\n  }\n\n  copy(): NodeContext {\n    let np: NodeContext = this;\n    do {\n      if (np.shared) {\n        break;\n      }\n      np.shared = true;\n      np = np.parent;\n    } while (np);\n    return this;\n  }\n\n  clone(): NodeContext {\n    const np = this.cloneItem();\n    let npc = np;\n    let npp: NodeContext;\n    while ((npp = npc.parent) != null) {\n      npp = npp.cloneItem();\n      npc.parent = npp;\n      npc = npp;\n    }\n    return np;\n  }\n\n  toNodePositionStep(): NodePositionStep {\n    return {\n      node: this.sourceNode,\n      shadowType: this.shadowType,\n      shadowContext: this.shadowContext,\n      nodeShadow: this.nodeShadow,\n      shadowSibling: this.shadowSibling\n        ? this.shadowSibling.toNodePositionStep()\n        : null,\n      formattingContext: this.formattingContext,\n      fragmentIndex: this.fragmentIndex,\n    };\n  }\n\n  toNodePosition(): NodePosition {\n    let nc: NodeContext = this;\n    const steps = [];\n    do {\n      // We need fully \"peeled\" path, so don't record first-XXX pseudoelement\n      // containers\n      if (\n        !nc.firstPseudo ||\n        !nc.parent ||\n        nc.parent.firstPseudo === nc.firstPseudo\n      ) {\n        steps.push(nc.toNodePositionStep());\n      }\n      nc = nc.parent;\n    } while (nc);\n    const actualOffsetInNode = this.preprocessedTextContent\n      ? Diff.resolveOriginalIndex(\n          this.preprocessedTextContent,\n          this.offsetInNode,\n        )\n      : this.offsetInNode;\n    return {\n      steps,\n      offsetInNode: actualOffsetInNode,\n      after: this.after,\n      preprocessedTextContent: this.preprocessedTextContent,\n    };\n  }\n\n  isInsideBFC(): boolean {\n    let parent = this.parent;\n    while (parent) {\n      if (parent.establishesBFC) {\n        return true;\n      }\n      parent = parent.parent;\n    }\n    return false;\n  }\n\n  getContainingBlockForAbsolute(): NodeContext {\n    let parent = this.parent;\n    while (parent) {\n      if (parent.containingBlockForAbsolute) {\n        return parent;\n      }\n      parent = parent.parent;\n    }\n    return null;\n  }\n\n  /**\n   * Walk up NodeContext tree (starting from itself) and call the callback for\n   * each block.\n   */\n  walkUpBlocks(callback: (p1: NodeContext) => any) {\n    let nodeContext: NodeContext = this;\n    while (nodeContext) {\n      if (!nodeContext.inline) {\n        callback(nodeContext);\n      }\n      nodeContext = nodeContext.parent;\n    }\n  }\n\n  belongsTo(formattingContext: FormattingContext): boolean {\n    return (\n      this.formattingContext === formattingContext &&\n      !!this.parent &&\n      this.parent.formattingContext === formattingContext\n    );\n  }\n}\n\nexport class ChunkPosition implements Vtree.ChunkPosition {\n  floats: NodePosition[] = null;\n\n  constructor(public primary: NodePosition) {}\n\n  clone(): ChunkPosition {\n    const result = new ChunkPosition(this.primary);\n    if (this.floats) {\n      result.floats = [];\n      for (let i = 0; i < this.floats.length; ++i) {\n        result.floats[i] = this.floats[i];\n      }\n    }\n    return result;\n  }\n\n  isSamePosition(other: ChunkPosition): boolean {\n    if (!other) {\n      return false;\n    }\n    if (this === other) {\n      return true;\n    }\n    if (!isSameNodePosition(this.primary, other.primary)) {\n      return false;\n    }\n    if (this.floats) {\n      if (!other.floats || this.floats.length !== other.floats.length) {\n        return false;\n      }\n      for (let i = 0; i < this.floats.length; i++) {\n        if (!isSameNodePosition(this.floats[i], other.floats[i])) {\n          return false;\n        }\n      }\n    } else if (other.floats) {\n      return false;\n    }\n    return true;\n  }\n}\n\nexport class FlowChunkPosition {\n  constructor(\n    public chunkPosition: ChunkPosition,\n    public readonly flowChunk: FlowChunk,\n  ) {}\n\n  clone(): FlowChunkPosition {\n    return new FlowChunkPosition(this.chunkPosition.clone(), this.flowChunk);\n  }\n\n  isSamePosition(other: FlowChunkPosition): boolean {\n    return (\n      !!other &&\n      (this === other || this.chunkPosition.isSamePosition(other.chunkPosition))\n    );\n  }\n}\n\nexport class FlowPosition {\n  positions: FlowChunkPosition[] = [];\n  startSide: string = \"any\";\n  breakAfter: string | null = null;\n\n  clone(): FlowPosition {\n    const newfp = new FlowPosition();\n    const arr = this.positions;\n    const newarr = newfp.positions;\n    for (let i = 0; i < arr.length; i++) {\n      newarr[i] = arr[i].clone();\n    }\n    newfp.startSide = this.startSide;\n    newfp.breakAfter = this.breakAfter;\n    return newfp;\n  }\n\n  isSamePosition(other: FlowPosition): boolean {\n    if (this === other) {\n      return true;\n    }\n    if (!other || this.positions.length !== other.positions.length) {\n      return false;\n    }\n    for (let i = 0; i < this.positions.length; i++) {\n      if (!this.positions[i].isSamePosition(other.positions[i])) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  hasContent(offset: number): boolean {\n    return (\n      this.positions.length > 0 &&\n      this.positions[0].flowChunk.startOffset <= offset\n    );\n  }\n}\n\nexport class LayoutPosition {\n  /**\n   * One-based, incremented before layout.\n   */\n  page: number = 0;\n  flows: { [key: string]: Flow } = {};\n  flowPositions: { [key: string]: FlowPosition } = {};\n\n  /**\n   * flowPositions is built up to this offset.\n   */\n  highestSeenOffset: number = 0;\n\n  // FIXME: This properties seem to be not used\n  highestSeenNode: Node;\n  lookupPositionOffset: number;\n\n  clone(): LayoutPosition {\n    const newcp = new LayoutPosition();\n    newcp.page = this.page;\n    newcp.highestSeenNode = this.highestSeenNode;\n    newcp.highestSeenOffset = this.highestSeenOffset;\n    newcp.lookupPositionOffset = this.lookupPositionOffset;\n    newcp.flows = this.flows;\n    for (const name in this.flowPositions) {\n      newcp.flowPositions[name] = this.flowPositions[name].clone();\n    }\n    return newcp;\n  }\n\n  isSamePosition(other: LayoutPosition): boolean {\n    if (this === other) {\n      return true;\n    }\n    if (\n      !other ||\n      this.page !== other.page ||\n      this.highestSeenOffset !== other.highestSeenOffset\n    ) {\n      return false;\n    }\n    const thisFlowNames = Object.keys(this.flowPositions);\n    const otherFlowNames = Object.keys(other.flowPositions);\n    if (thisFlowNames.length !== otherFlowNames.length) {\n      return false;\n    }\n    for (const flowName of thisFlowNames) {\n      if (\n        !this.flowPositions[flowName].isSamePosition(\n          other.flowPositions[flowName],\n        )\n      ) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  /**\n   * @param name flow name.\n   */\n  hasContent(name: string, offset: number): boolean {\n    const flowPos = this.flowPositions[name];\n    if (!flowPos) {\n      return false;\n    }\n    return flowPos.hasContent(offset);\n  }\n\n  startSideOfFlow(name: string): string {\n    const flowPos = this.flowPositions[name];\n    if (!flowPos) {\n      return \"any\";\n    }\n    return flowPos.startSide;\n  }\n\n  firstFlowChunkOfFlow(name: string): FlowChunk | null {\n    const flowPos = this.flowPositions[name];\n    if (!flowPos) {\n      return null;\n    }\n    const flowChunkPosition = flowPos.positions[0];\n    if (!flowChunkPosition) {\n      return null;\n    }\n    return flowChunkPosition.flowChunk;\n  }\n}\n\nexport class Container implements Vtree.Container {\n  left: number = 0;\n  top: number = 0;\n  marginLeft: number = 0;\n  marginRight: number = 0;\n  marginTop: number = 0;\n  marginBottom: number = 0;\n  borderLeft: number = 0;\n  borderRight: number = 0;\n  borderTop: number = 0;\n  borderBottom: number = 0;\n  paddingLeft: number = 0;\n  paddingRight: number = 0;\n  paddingTop: number = 0;\n  paddingBottom: number = 0;\n  width: number = 0;\n  height: number = 0;\n  originX: number = 0;\n  originY: number = 0;\n  exclusions: GeometryUtil.Shape[] = null;\n  innerShape: GeometryUtil.Shape = null;\n  computedBlockSize: number = 0;\n  snapWidth: number = 0;\n  snapHeight: number = 0;\n  snapOffsetX: number = 0;\n  snapOffsetY: number = 0;\n  vertical: boolean = false; // vertical writing\n\n  constructor(public element: Element) {}\n\n  getInsetTop() {\n    return this.marginTop + this.borderTop + this.paddingTop;\n  }\n\n  getInsetBottom() {\n    return this.marginBottom + this.borderBottom + this.paddingBottom;\n  }\n\n  getInsetLeft() {\n    return this.marginLeft + this.borderLeft + this.paddingLeft;\n  }\n\n  getInsetRight() {\n    return this.marginRight + this.borderRight + this.paddingRight;\n  }\n\n  getInsetBefore() {\n    if (this.vertical) {\n      return this.getInsetRight();\n    } else {\n      return this.getInsetTop();\n    }\n  }\n\n  getInsetAfter() {\n    if (this.vertical) {\n      return this.getInsetLeft();\n    } else {\n      return this.getInsetBottom();\n    }\n  }\n\n  getInsetStart() {\n    if (this.vertical) {\n      return this.getInsetTop();\n    } else {\n      return this.getInsetLeft();\n    }\n  }\n\n  getInsetEnd() {\n    if (this.vertical) {\n      return this.getInsetBottom();\n    } else {\n      return this.getInsetRight();\n    }\n  }\n\n  getBeforeEdge(box: ClientRect): number {\n    return this.vertical ? box.right : box.top;\n  }\n\n  getAfterEdge(box: ClientRect): number {\n    return this.vertical ? box.left : box.bottom;\n  }\n\n  getStartEdge(box: ClientRect): number {\n    return this.vertical ? box.top : box.left;\n  }\n\n  getEndEdge(box: ClientRect): number {\n    return this.vertical ? box.bottom : box.right;\n  }\n\n  getInlineSize(box: ClientRect): number {\n    return this.vertical ? box.bottom - box.top : box.right - box.left;\n  }\n\n  getBoxSize(box: ClientRect): number {\n    return this.vertical ? box.right - box.left : box.bottom - box.top;\n  }\n\n  getBoxDir(): number {\n    return this.vertical ? -1 : 1;\n  }\n\n  getInlineDir(): number {\n    return 1;\n  }\n\n  copyFrom(other: Container): void {\n    this.element = other.element;\n    this.left = other.left;\n    this.top = other.top;\n    this.marginLeft = other.marginLeft;\n    this.marginRight = other.marginRight;\n    this.marginTop = other.marginTop;\n    this.marginBottom = other.marginBottom;\n    this.borderLeft = other.borderLeft;\n    this.borderRight = other.borderRight;\n    this.borderTop = other.borderTop;\n    this.borderBottom = other.borderBottom;\n    this.paddingLeft = other.paddingLeft;\n    this.paddingRight = other.paddingRight;\n    this.paddingTop = other.paddingTop;\n    this.paddingBottom = other.paddingBottom;\n    this.width = other.width;\n    this.height = other.height;\n    this.originX = other.originX;\n    this.originY = other.originY;\n    this.innerShape = other.innerShape;\n    this.exclusions = other.exclusions;\n    this.computedBlockSize = other.computedBlockSize;\n    this.snapWidth = other.snapWidth;\n    this.snapHeight = other.snapHeight;\n    this.vertical = other.vertical;\n  }\n\n  setVerticalPosition(top: number, height: number): void {\n    this.top = top;\n    this.height = height;\n    Base.setCSSProperty(this.element, \"top\", `${top}px`);\n    Base.setCSSProperty(this.element, \"height\", `${height}px`);\n  }\n\n  setHorizontalPosition(left: number, width: number): void {\n    this.left = left;\n    this.width = width;\n    Base.setCSSProperty(this.element, \"left\", `${left}px`);\n    Base.setCSSProperty(this.element, \"width\", `${width}px`);\n  }\n\n  setBlockPosition(start: number, extent: number): void {\n    if (this.vertical) {\n      this.setHorizontalPosition(start + extent * this.getBoxDir(), extent);\n    } else {\n      this.setVerticalPosition(start, extent);\n    }\n  }\n\n  setInlinePosition(start: number, extent: number): void {\n    if (this.vertical) {\n      this.setVerticalPosition(start, extent);\n    } else {\n      this.setHorizontalPosition(start, extent);\n    }\n  }\n\n  clear() {\n    const parent = this.element;\n    let c: Node;\n    while ((c = parent.lastChild)) {\n      parent.removeChild(c);\n    }\n  }\n\n  getInnerShape(): GeometryUtil.Shape {\n    const rect = this.getInnerRect();\n    if (this.innerShape) {\n      return this.innerShape.withOffset(rect.x1, rect.y1);\n    }\n    return GeometryUtil.shapeForRect(rect.x1, rect.y1, rect.x2, rect.y2);\n  }\n\n  getInnerRect(): GeometryUtil.Rect {\n    const offsetX = this.originX + this.left + this.getInsetLeft();\n    const offsetY = this.originY + this.top + this.getInsetTop();\n    return new GeometryUtil.Rect(\n      offsetX,\n      offsetY,\n      offsetX + this.width,\n      offsetY + this.height,\n    );\n  }\n\n  getPaddingRect(): GeometryUtil.Rect {\n    const paddingX =\n      this.originX + this.left + this.marginLeft + this.borderLeft;\n    const paddingY = this.originY + this.top + this.marginTop + this.borderTop;\n    const paddingWidth = this.paddingLeft + this.width + this.paddingRight;\n    const paddingHeight = this.paddingTop + this.height + this.paddingBottom;\n    return new GeometryUtil.Rect(\n      paddingX,\n      paddingY,\n      paddingX + paddingWidth,\n      paddingY + paddingHeight,\n    );\n  }\n\n  getOuterShape(\n    outerShapeProp: Css.Val,\n    context: Exprs.Context,\n  ): GeometryUtil.Shape {\n    const rect = this.getOuterRect();\n    return CssProp.toShape(\n      outerShapeProp,\n      rect.x1,\n      rect.y1,\n      rect.x2 - rect.x1,\n      rect.y2 - rect.y1,\n      context,\n    );\n  }\n\n  getOuterRect(): GeometryUtil.Rect {\n    const outerX = this.originX + this.left;\n    const outerY = this.originY + this.top;\n    const outerWidth = this.getInsetLeft() + this.width + this.getInsetRight();\n    const outerHeight =\n      this.getInsetTop() + this.height + this.getInsetBottom();\n    return new GeometryUtil.Rect(\n      outerX,\n      outerY,\n      outerX + outerWidth,\n      outerY + outerHeight,\n    );\n  }\n}\n\nexport type ExprContentListener = Vtree.ExprContentListener;\n\nexport class ContentPropertyHandler extends Css.Visitor {\n  constructor(\n    public readonly elem: Element,\n    public readonly context: Exprs.Context,\n    public readonly rootContentValue: Css.Val,\n    public readonly exprContentListener: ExprContentListener,\n  ) {\n    super();\n  }\n\n  private visitStrInner(str: string, node?: Node | null) {\n    if (!node) {\n      node = this.elem.ownerDocument.createTextNode(str);\n    }\n    this.elem.appendChild(node);\n  }\n\n  /** @override */\n  visitStr(str: Css.Str): Css.Val {\n    this.visitStrInner(str.str);\n    return null;\n  }\n\n  /** @override */\n  visitURL(url: Css.URL): Css.Val {\n    if ((this.rootContentValue as any).url) {\n      this.elem.setAttribute(\"src\", url.url);\n    } else {\n      const img = this.elem.ownerDocument.createElementNS(Base.NS.XHTML, \"img\");\n      img.setAttribute(\"src\", url.url);\n      this.elem.appendChild(img);\n    }\n    return null;\n  }\n\n  /** @override */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    this.visitValues(list.values);\n    return null;\n  }\n\n  /** @override */\n  visitExpr(expr: Css.Expr): Css.Val {\n    const ex = expr.toExpr();\n    let val = ex.evaluate(this.context);\n    if (typeof val === \"string\") {\n      if (ex instanceof Exprs.Named) {\n        // For env(pub-title) and env(doc-title)\n        // Need to unquote the result. To be consistent with cssparse.evaluateExprToCSS()\n        val = CssParser.parseValue(\n          ex.scope,\n          new CssTokenizer.Tokenizer(val, null),\n          \"\",\n        ).stringValue();\n      }\n      assert(this.elem.ownerDocument);\n      const node = this.exprContentListener(ex, val, this.elem.ownerDocument);\n      this.visitStrInner(val, node);\n    }\n    return null;\n  }\n}\n\nexport function nonTrivialContent(val: Css.Val): boolean {\n  return (\n    val != null &&\n    val !== Css.ident.normal &&\n    val !== Css.ident.none &&\n    val !== Css.ident.inherit\n  );\n}\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview PageFloats - CSS Page Floats\n */\nimport * as Asserts from \"./asserts\";\nimport * as Css from \"./css\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as Logging from \"./logging\";\nimport * as CssLogicalUtil from \"./css-logical-util\";\nimport * as Sizing from \"./sizing\";\nimport * as Task from \"./task\";\nimport * as VtreeImpl from \"./vtree\";\nimport { Layout as LayoutType, PageFloats, Vtree } from \"./types\";\n\nexport const FloatReference = PageFloats.FloatReference;\nexport type FloatReference = PageFloats.FloatReference;\n\ntype PageFloatID = PageFloats.PageFloatID;\n\nexport function floatReferenceOf(str: string): FloatReference {\n  switch (str) {\n    case \"inline\":\n      return FloatReference.INLINE;\n    case \"column\":\n      return FloatReference.COLUMN;\n    case \"region\":\n      return FloatReference.REGION;\n    case \"page\":\n      return FloatReference.PAGE;\n    default:\n      throw new Error(`Unknown float-reference: ${str}`);\n  }\n}\n\nexport function isPageFloat(floatReference: FloatReference): boolean {\n  switch (floatReference) {\n    case FloatReference.INLINE:\n      return false;\n    case FloatReference.COLUMN:\n    case FloatReference.REGION:\n    case FloatReference.PAGE:\n      return true;\n    default:\n      throw new Error(`Unknown float-reference: ${floatReference}`);\n  }\n}\n\n/**\n * Interpret a float value with the writing-mode and direction assuming the\n * float-reference is inline and returns \"left\" or \"right\".\n */\nexport function resolveInlineFloatDirection(\n  floatSide: string,\n  vertical: boolean,\n  direction: string,\n): string {\n  const writingMode = vertical ? \"vertical-rl\" : \"horizontal-tb\";\n  if (floatSide === \"top\" || floatSide === \"bottom\") {\n    floatSide = CssLogicalUtil.toLogical(floatSide, writingMode, direction);\n  }\n  if (floatSide === \"block-start\") {\n    floatSide = \"inline-start\";\n  }\n  if (floatSide === \"block-end\") {\n    floatSide = \"inline-end\";\n  }\n  if (floatSide === \"inline-start\" || floatSide === \"inline-end\") {\n    const physicalValue = CssLogicalUtil.toPhysical(\n      floatSide,\n      writingMode,\n      direction,\n    );\n    const lineRelativeValue = CssLogicalUtil.toLineRelative(\n      physicalValue,\n      writingMode,\n    );\n    if (lineRelativeValue === \"line-left\") {\n      floatSide = \"left\";\n    } else if (lineRelativeValue === \"line-right\") {\n      floatSide = \"right\";\n    }\n  }\n  if (floatSide !== \"left\" && floatSide !== \"right\") {\n    Logging.logger.warn(`Invalid float value: ${floatSide}. Fallback to left.`);\n    floatSide = \"left\";\n  }\n  return floatSide;\n}\n\nexport class PageFloat implements PageFloats.PageFloat {\n  order: number | null = null;\n  id: PageFloatID | null = null;\n\n  constructor(\n    public readonly nodePosition: Vtree.NodePosition,\n    public readonly floatReference: FloatReference,\n    public readonly floatSide: string,\n    public readonly clearSide: string | null,\n    public readonly flowName: string,\n    public readonly floatMinWrapBlock: Css.Numeric | null,\n  ) {}\n\n  getOrder(): number {\n    if (this.order === null) {\n      throw new Error(\"The page float is not yet added\");\n    }\n    return this.order;\n  }\n\n  getId(): PageFloatID {\n    if (!this.id) {\n      throw new Error(\"The page float is not yet added\");\n    }\n    return this.id;\n  }\n\n  isAllowedOnContext(pageFloatLayoutContext: PageFloatLayoutContext): boolean {\n    return pageFloatLayoutContext.isAnchorAlreadyAppeared(this.getId());\n  }\n\n  isAllowedToPrecede(other: PageFloat): boolean {\n    return false;\n  }\n}\n\nexport class PageFloatStore {\n  private floats: PageFloat[] = [];\n  private nextPageFloatIndex: number = 0;\n\n  private nextOrder(): number {\n    return this.nextPageFloatIndex++;\n  }\n\n  private createPageFloatId(order: number): PageFloatID {\n    return `pf${order}`;\n  }\n\n  addPageFloat(float: PageFloat) {\n    const index = this.floats.findIndex((f) =>\n      VtreeImpl.isSameNodePosition(f.nodePosition, float.nodePosition),\n    );\n    if (index >= 0) {\n      throw new Error(\n        \"A page float with the same source node is already registered\",\n      );\n    } else {\n      const order = (float.order = this.nextOrder());\n      float.id = this.createPageFloatId(order);\n      this.floats.push(float);\n    }\n  }\n\n  findPageFloatByNodePosition(\n    nodePosition: Vtree.NodePosition,\n  ): PageFloat | null {\n    const index = this.floats.findIndex((f) =>\n      VtreeImpl.isSameNodePosition(f.nodePosition, nodePosition),\n    );\n    return index >= 0 ? this.floats[index] : null;\n  }\n\n  findPageFloatById(id: PageFloatID) {\n    const index = this.floats.findIndex((f) => f.id === id);\n    return index >= 0 ? this.floats[index] : null;\n  }\n}\n\n/**\n * @param continues Represents whether the float is fragmented and continues\n *     after this fragment\n */\nexport class PageFloatFragment implements PageFloats.PageFloatFragment {\n  constructor(\n    public readonly floatReference: FloatReference,\n    public readonly floatSide: string,\n    public readonly continuations: PageFloatContinuation[],\n    public readonly area: Vtree.Container,\n    public readonly continues: boolean,\n  ) {}\n\n  hasFloat(float: PageFloat): boolean {\n    return this.continuations.some((c) => c.float === float);\n  }\n\n  findNotAllowedFloat(context: PageFloatLayoutContext): PageFloat | null {\n    for (let i = this.continuations.length - 1; i >= 0; i--) {\n      const f = this.continuations[i].float;\n      if (!f.isAllowedOnContext(context)) {\n        return f;\n      }\n    }\n    return null;\n  }\n\n  getOuterShape(): GeometryUtil.Shape {\n    return this.area.getOuterShape(null, null);\n  }\n\n  getOuterRect(): GeometryUtil.Rect {\n    return this.area.getOuterRect();\n  }\n\n  getOrder(): number {\n    const floats = this.continuations.map((c) => c.float);\n    return Math.min.apply(\n      null,\n      floats.map((f) => f.getOrder()),\n    );\n  }\n\n  shouldBeStashedBefore(float: PageFloat): boolean {\n    return this.getOrder() < float.getOrder();\n  }\n\n  addContinuations(continuations: PageFloatContinuation[]) {\n    continuations.forEach((c) => {\n      this.continuations.push(c);\n    });\n  }\n\n  getFlowName(): string {\n    const flowName = this.continuations[0].float.flowName;\n    Asserts.assert(\n      this.continuations.every((c) => c.float.flowName === flowName),\n    );\n    return flowName;\n  }\n}\n\nexport class PageFloatContinuation implements PageFloats.PageFloatContinuation {\n  constructor(\n    public readonly float: PageFloat,\n    public readonly nodePosition: Vtree.NodePosition,\n  ) {}\n\n  equals(other: PageFloatContinuation | null): boolean {\n    if (!other) {\n      return false;\n    }\n    if (this === other) {\n      return true;\n    }\n    return (\n      this.float === other.float &&\n      VtreeImpl.isSameNodePosition(this.nodePosition, other.nodePosition)\n    );\n  }\n}\n\nexport type PageFloatPlacementCondition = PageFloats.PageFloatPlacementCondition;\n\n/**\n * @param generatingNodePosition Source NodePosition generating the context.\n *     Specify when a column context is generated by a non-root element (for\n *     example page floats)\n */\nexport class PageFloatLayoutContext\n  implements PageFloats.PageFloatLayoutContext {\n  private children: PageFloatLayoutContext[] = [];\n  writingMode: Css.Val;\n  direction: Css.Val;\n  private invalidated: boolean = false;\n  private floatStore: PageFloatStore;\n  private forbiddenFloats: PageFloatID[] = [];\n  floatFragments: PageFloatFragment[] = [];\n  private stashedFloatFragments: PageFloatFragment[] = [];\n  private floatAnchors: { [key in PageFloatID]: Node } = {};\n  private floatsDeferredToNext: PageFloatContinuation[] = [];\n  private floatsDeferredFromPrevious: PageFloatContinuation[];\n  private layoutConstraints: LayoutType.LayoutConstraint[] = [];\n  private locked: boolean = false;\n\n  constructor(\n    public readonly parent: PageFloatLayoutContext,\n    private readonly floatReference: FloatReference | null,\n    private container: Vtree.Container,\n    public readonly flowName: string | null,\n    public readonly generatingNodePosition: Vtree.NodePosition | null,\n    writingMode: Css.Val | null,\n    direction: Css.Val | null,\n  ) {\n    if (parent) {\n      parent.children.push(this);\n    }\n    this.writingMode =\n      writingMode || (parent && parent.writingMode) || Css.ident.horizontal_tb;\n    this.direction = direction || (parent && parent.direction) || Css.ident.ltr;\n    this.floatStore = parent ? parent.floatStore : new PageFloatStore();\n    const previousSibling = this.getPreviousSibling();\n    this.floatsDeferredFromPrevious = previousSibling\n      ? [].concat(previousSibling.floatsDeferredToNext)\n      : [];\n  }\n\n  private getParent(floatReference: FloatReference): PageFloatLayoutContext {\n    if (!this.parent) {\n      throw new Error(`No PageFloatLayoutContext for ${floatReference}`);\n    }\n    return this.parent;\n  }\n\n  private getPreviousSiblingOf(\n    child: PageFloatLayoutContext | null,\n    floatReference: FloatReference | null,\n    flowName: string | null,\n    generatingNodePosition: Vtree.NodePosition | null,\n  ): PageFloatLayoutContext | null {\n    let index = this.children.indexOf(child as PageFloatLayoutContext);\n    if (index < 0) {\n      index = this.children.length;\n    }\n    for (let i = index - 1; i >= 0; i--) {\n      let result = this.children[i];\n      if (\n        result.floatReference === floatReference &&\n        result.flowName === flowName &&\n        VtreeImpl.isSameNodePosition(\n          result.generatingNodePosition,\n          generatingNodePosition,\n        )\n      ) {\n        return result;\n      } else {\n        result = result.getPreviousSiblingOf(\n          null,\n          floatReference,\n          flowName,\n          generatingNodePosition,\n        );\n        if (result) {\n          return result;\n        }\n      }\n    }\n    return null;\n  }\n\n  private getPreviousSibling(): PageFloatLayoutContext | null {\n    let child: PageFloatLayoutContext = this;\n    let parent = this.parent;\n    let result: PageFloatLayoutContext;\n    while (parent) {\n      result = parent.getPreviousSiblingOf(\n        child,\n        this.floatReference,\n        this.flowName,\n        this.generatingNodePosition,\n      );\n      if (result) {\n        return result;\n      }\n      child = parent;\n      parent = parent.parent;\n    }\n    return null;\n  }\n\n  getContainer(floatReference?: FloatReference): Vtree.Container {\n    if (!floatReference || floatReference === this.floatReference) {\n      return this.container;\n    }\n    return this.getParent(floatReference).getContainer(floatReference);\n  }\n\n  setContainer(container: Vtree.Container) {\n    this.container = container;\n    this.reattachFloatFragments();\n  }\n\n  addPageFloat(float: PageFloat) {\n    this.floatStore.addPageFloat(float);\n  }\n\n  getPageFloatLayoutContext(\n    floatReference: FloatReference,\n  ): PageFloatLayoutContext {\n    if (floatReference === this.floatReference) {\n      return this;\n    }\n    return this.getParent(floatReference).getPageFloatLayoutContext(\n      floatReference,\n    );\n  }\n\n  findPageFloatByNodePosition(\n    nodePosition: Vtree.NodePosition,\n  ): PageFloat | null {\n    return this.floatStore.findPageFloatByNodePosition(nodePosition);\n  }\n\n  private forbid(float: PageFloat) {\n    const id = float.getId();\n    const floatReference = float.floatReference;\n    if (floatReference === this.floatReference) {\n      if (!this.forbiddenFloats.includes(id)) {\n        this.forbiddenFloats.push(id);\n        const strategy = new PageFloatLayoutStrategyResolver().findByFloat(\n          float,\n        );\n        strategy.forbid(float, this);\n      }\n    } else {\n      const parent = this.getParent(floatReference);\n      parent.forbid(float);\n    }\n  }\n\n  isForbidden(float: PageFloat): boolean {\n    const id = float.getId();\n    const floatReference = float.floatReference;\n    if (floatReference === this.floatReference) {\n      return this.forbiddenFloats.includes(id);\n    } else {\n      const parent = this.getParent(floatReference);\n      return parent.isForbidden(float);\n    }\n  }\n\n  addPageFloatFragment(\n    floatFragment: PageFloatFragment,\n    dontInvalidate?: boolean,\n  ) {\n    const floatReference = floatFragment.floatReference;\n    if (floatReference !== this.floatReference) {\n      const parent = this.getParent(floatReference);\n      parent.addPageFloatFragment(floatFragment, dontInvalidate);\n    } else if (!this.floatFragments.includes(floatFragment)) {\n      this.floatFragments.push(floatFragment);\n      this.floatFragments.sort((fr1, fr2) => fr1.getOrder() - fr2.getOrder());\n    }\n    if (!dontInvalidate) {\n      this.invalidate();\n    }\n  }\n\n  removePageFloatFragment(\n    floatFragment: PageFloatFragment,\n    dontInvalidate?: boolean,\n  ) {\n    const floatReference = floatFragment.floatReference;\n    if (floatReference !== this.floatReference) {\n      const parent = this.getParent(floatReference);\n      parent.removePageFloatFragment(floatFragment, dontInvalidate);\n    } else {\n      const index = this.floatFragments.indexOf(floatFragment);\n      if (index >= 0) {\n        const fragment = this.floatFragments.splice(index, 1)[0];\n        const element = fragment.area && fragment.area.element;\n        if (element && element.parentNode) {\n          element.parentNode.removeChild(element);\n        }\n        if (!dontInvalidate) {\n          this.invalidate();\n        }\n      }\n    }\n  }\n\n  findPageFloatFragment(float: PageFloat): PageFloatFragment | null {\n    if (float.floatReference !== this.floatReference) {\n      const parent = this.getParent(float.floatReference);\n      return parent.findPageFloatFragment(float);\n    }\n    const index = this.floatFragments.findIndex((f) => f.hasFloat(float));\n    if (index >= 0) {\n      return this.floatFragments[index];\n    } else {\n      return null;\n    }\n  }\n\n  hasFloatFragments(condition?: (p1: PageFloatFragment) => boolean): boolean {\n    if (this.floatFragments.length > 0) {\n      if (!condition || this.floatFragments.some(condition)) {\n        return true;\n      }\n    }\n    if (this.parent) {\n      return this.parent.hasFloatFragments(condition);\n    } else {\n      return false;\n    }\n  }\n\n  hasContinuingFloatFragmentsInFlow(flowName: string): boolean {\n    return this.hasFloatFragments(\n      (fragment) => fragment.continues && fragment.getFlowName() === flowName,\n    );\n  }\n\n  registerPageFloatAnchor(float: PageFloat, anchorViewNode: Node) {\n    this.floatAnchors[float.getId()] = anchorViewNode;\n  }\n\n  collectPageFloatAnchors() {\n    const anchors = Object.assign({}, this.floatAnchors);\n    return this.children.reduce(\n      (prev, child) => Object.assign(prev, child.collectPageFloatAnchors()),\n      anchors,\n    );\n  }\n\n  isAnchorAlreadyAppeared(floatId: PageFloatID) {\n    const deferredFloats = this.getDeferredPageFloatContinuations();\n    if (deferredFloats.some((cont) => cont.float.getId() === floatId)) {\n      return true;\n    }\n    const floatAnchors = this.collectPageFloatAnchors();\n    const anchorViewNode = floatAnchors[floatId];\n    if (!anchorViewNode) {\n      return false;\n    }\n    if (this.container && this.container.element) {\n      return this.container.element.contains(anchorViewNode);\n    }\n    return false;\n  }\n\n  deferPageFloat(continuation: PageFloatContinuation) {\n    const float = continuation.float;\n    if (float.floatReference === this.floatReference) {\n      const index = this.floatsDeferredToNext.findIndex(\n        (c) => c.float === float,\n      );\n      if (index >= 0) {\n        this.floatsDeferredToNext.splice(index, 1, continuation);\n      } else {\n        this.floatsDeferredToNext.push(continuation);\n      }\n    } else {\n      const parent = this.getParent(float.floatReference);\n      parent.deferPageFloat(continuation);\n    }\n  }\n\n  hasPrecedingFloatsDeferredToNext(\n    float: PageFloat,\n    ignoreReference?: boolean,\n  ): boolean {\n    if (!ignoreReference && float.floatReference !== this.floatReference) {\n      return this.getParent(\n        float.floatReference,\n      ).hasPrecedingFloatsDeferredToNext(float, false);\n    }\n    const order = float.getOrder();\n    const hasPrecedingFloatsDeferredToNext = this.floatsDeferredToNext.some(\n      (c) => c.float.getOrder() < order && !float.isAllowedToPrecede(c.float),\n    );\n    if (hasPrecedingFloatsDeferredToNext) {\n      return true;\n    } else if (this.parent) {\n      return this.parent.hasPrecedingFloatsDeferredToNext(float, true);\n    } else {\n      return false;\n    }\n  }\n\n  getLastFollowingFloatInFragments(float: PageFloat): PageFloat | null {\n    const order = float.getOrder();\n    let lastFollowing: PageFloat = null;\n    this.floatFragments.forEach((fragment) => {\n      fragment.continuations.forEach((c) => {\n        const f = c.float;\n        const o = f.getOrder();\n        if (o > order && (!lastFollowing || o > lastFollowing.getOrder())) {\n          lastFollowing = f;\n        }\n      });\n    });\n    if (this.parent) {\n      const lastFollowingOfParent = this.parent.getLastFollowingFloatInFragments(\n        float,\n      );\n      if (\n        lastFollowingOfParent &&\n        (!lastFollowing ||\n          lastFollowingOfParent.getOrder() > lastFollowing.getOrder())\n      ) {\n        lastFollowing = lastFollowingOfParent;\n      }\n    }\n    return lastFollowing;\n  }\n\n  getDeferredPageFloatContinuations(\n    flowName?: string | null,\n  ): PageFloatContinuation[] {\n    flowName = flowName || this.flowName;\n    let result = this.floatsDeferredFromPrevious.filter(\n      (cont) => !flowName || cont.float.flowName === flowName,\n    );\n    if (this.parent) {\n      result = this.parent\n        .getDeferredPageFloatContinuations(flowName)\n        .concat(result);\n    }\n    return result.sort((c1, c2) => c1.float.getOrder() - c2.float.getOrder());\n  }\n\n  getPageFloatContinuationsDeferredToNext(\n    flowName?: string | null,\n  ): PageFloatContinuation[] {\n    flowName = flowName || this.flowName;\n    const result = this.floatsDeferredToNext.filter(\n      (cont) => !flowName || cont.float.flowName === flowName,\n    );\n    if (this.parent) {\n      return this.parent\n        .getPageFloatContinuationsDeferredToNext(flowName)\n        .concat(result);\n    } else {\n      return result;\n    }\n  }\n\n  getFloatsDeferredToNextInChildContexts(): PageFloat[] {\n    let result = [];\n    const done = [];\n    for (let i = this.children.length - 1; i >= 0; i--) {\n      const child = this.children[i];\n      if (done.includes(child.flowName)) {\n        continue;\n      }\n      done.push(child.flowName);\n      result = result.concat(child.floatsDeferredToNext.map((c) => c.float));\n      result = result.concat(child.getFloatsDeferredToNextInChildContexts());\n    }\n    return result;\n  }\n\n  checkAndForbidNotAllowedFloat(): boolean {\n    if (this.checkAndForbidFloatFollowingDeferredFloat()) {\n      return true;\n    }\n    for (let i = this.floatFragments.length - 1; i >= 0; i--) {\n      const fragment = this.floatFragments[i];\n      const notAllowedFloat = fragment.findNotAllowedFloat(this);\n      if (notAllowedFloat) {\n        if (this.locked) {\n          this.invalidate();\n        } else {\n          this.removePageFloatFragment(fragment);\n          this.forbid(notAllowedFloat);\n\n          // If the removed float is a block-end/inline-end float,\n          // we should re-layout preceding floats with the same float direction.\n          this.removeEndFloatFragments(fragment.floatSide);\n        }\n        return true;\n      }\n    }\n    if (this.floatReference === FloatReference.REGION && this.parent.locked) {\n      return this.parent.checkAndForbidNotAllowedFloat();\n    }\n    return false;\n  }\n\n  checkAndForbidFloatFollowingDeferredFloat(): boolean {\n    const deferredFloats = this.getFloatsDeferredToNextInChildContexts();\n    const floatsInFragments = this.floatFragments.reduce(\n      (r, fr) => r.concat(fr.continuations.map((c) => c.float)),\n      [],\n    );\n    floatsInFragments.sort((f1, f2) => f2.getOrder() - f1.getOrder());\n    for (const float of floatsInFragments) {\n      const order = float.getOrder();\n      if (\n        deferredFloats.some(\n          (d) => !float.isAllowedToPrecede(d) && order > d.getOrder(),\n        )\n      ) {\n        if (this.locked) {\n          this.invalidate();\n        } else {\n          this.forbid(float);\n          const fragment = this.findPageFloatFragment(float);\n          Asserts.assert(fragment);\n          this.removePageFloatFragment(fragment);\n        }\n        return true;\n      }\n    }\n    return false;\n  }\n\n  finish() {\n    if (this.checkAndForbidNotAllowedFloat()) {\n      return;\n    }\n    for (let i = this.floatsDeferredToNext.length - 1; i >= 0; i--) {\n      const continuation = this.floatsDeferredToNext[i];\n      if (!continuation.float.isAllowedOnContext(this)) {\n        if (this.locked) {\n          this.invalidate();\n          return;\n        }\n        this.floatsDeferredToNext.splice(i, 1);\n      }\n    }\n    this.floatsDeferredFromPrevious.forEach((continuation) => {\n      if (\n        this.floatsDeferredToNext.findIndex((c) => continuation.equals(c)) >= 0\n      ) {\n        return;\n      }\n      if (this.floatFragments.some((f) => f.hasFloat(continuation.float))) {\n        return;\n      }\n      this.floatsDeferredToNext.push(continuation);\n    });\n  }\n\n  hasSameContainerAs(other: PageFloatLayoutContext): boolean {\n    return (\n      !!this.container &&\n      !!other.container &&\n      this.container.element === other.container.element\n    );\n  }\n\n  invalidate() {\n    this.invalidated = true;\n    if (this.locked) {\n      return;\n    }\n    if (this.container) {\n      this.children.forEach((child) => {\n        // Since the same container element is shared by a region page float\n        // layout context and a column page float layout context in a single\n        // column region, view elements of float fragments of the child (column)\n        // context need to be removed here.\n        if (this.hasSameContainerAs(child)) {\n          child.floatFragments.forEach((fragment) => {\n            const elem = fragment.area.element;\n            if (elem && elem.parentNode) {\n              elem.parentNode.removeChild(elem);\n            }\n          });\n        }\n      });\n      this.container.clear();\n    }\n    this.children.forEach((child) => {\n      child.layoutConstraints.splice(0);\n    });\n    this.children.splice(0);\n    Object.keys(this.floatAnchors).forEach((k) => {\n      delete this.floatAnchors[k];\n    });\n  }\n\n  detachChildren(): PageFloatLayoutContext[] {\n    const children = this.children.splice(0);\n    children.forEach((child) => {\n      child.floatFragments.forEach((fragment) => {\n        const elem = fragment.area.element;\n        if (elem && elem.parentNode) {\n          elem.parentNode.removeChild(elem);\n        }\n      });\n    });\n    return children;\n  }\n\n  attachChildren(children: PageFloatLayoutContext[]) {\n    children.forEach((child) => {\n      this.children.push(child);\n      child.reattachFloatFragments();\n    });\n  }\n\n  isInvalidated() {\n    return this.invalidated || (!!this.parent && this.parent.isInvalidated());\n  }\n\n  validate() {\n    this.invalidated = false;\n  }\n\n  private toLogical(side: string): string {\n    const writingMode = this.writingMode.toString();\n    const direction = this.direction.toString();\n    return CssLogicalUtil.toLogical(side, writingMode, direction);\n  }\n\n  private toPhysical(side: string): string {\n    const writingMode = this.writingMode.toString();\n    const direction = this.direction.toString();\n    return CssLogicalUtil.toPhysical(side, writingMode, direction);\n  }\n\n  removeEndFloatFragments(floatSide: string) {\n    const logicalFloatSide = this.toLogical(floatSide);\n    if (logicalFloatSide === \"block-end\" || logicalFloatSide === \"inline-end\") {\n      let i = 0;\n      while (i < this.floatFragments.length) {\n        const fragment = this.floatFragments[i];\n        const logicalFloatSide2 = this.toLogical(fragment.floatSide);\n        if (logicalFloatSide2 === logicalFloatSide) {\n          this.removePageFloatFragment(fragment);\n        } else {\n          i++;\n        }\n      }\n    }\n  }\n\n  stashEndFloatFragments(float: PageFloat) {\n    const floatReference = float.floatReference;\n    if (floatReference !== this.floatReference) {\n      this.getParent(floatReference).stashEndFloatFragments(float);\n      return;\n    }\n    const logicalFloatSide = this.toLogical(float.floatSide);\n    if (\n      logicalFloatSide === \"block-end\" ||\n      logicalFloatSide === \"snap-block\" ||\n      logicalFloatSide === \"inline-end\"\n    ) {\n      let i = 0;\n      while (i < this.floatFragments.length) {\n        const fragment = this.floatFragments[i];\n        const fragmentFloatSide = this.toLogical(fragment.floatSide);\n        if (\n          (fragmentFloatSide === logicalFloatSide ||\n            (logicalFloatSide === \"snap-block\" &&\n              fragmentFloatSide === \"block-end\")) &&\n          fragment.shouldBeStashedBefore(float)\n        ) {\n          this.stashedFloatFragments.push(fragment);\n          this.floatFragments.splice(i, 1);\n        } else {\n          i++;\n        }\n      }\n    }\n  }\n\n  restoreStashedFragments(floatReference: FloatReference) {\n    if (floatReference !== this.floatReference) {\n      this.getParent(floatReference).restoreStashedFragments(floatReference);\n      return;\n    }\n    this.stashedFloatFragments.forEach((stashed) => {\n      this.addPageFloatFragment(stashed, true);\n    });\n    this.stashedFloatFragments.splice(0);\n  }\n\n  discardStashedFragments(floatReference: FloatReference) {\n    if (floatReference !== this.floatReference) {\n      this.getParent(floatReference).discardStashedFragments(floatReference);\n      return;\n    }\n    this.stashedFloatFragments.splice(0);\n  }\n\n  getStashedFloatFragments(\n    floatReference: FloatReference,\n  ): PageFloatFragment[] {\n    if (floatReference === this.floatReference) {\n      return this.stashedFloatFragments\n        .concat()\n        .sort((fr1, fr2) => fr2.getOrder() - fr1.getOrder()); // return in reverse order\n    } else {\n      return this.getParent(floatReference).getStashedFloatFragments(\n        floatReference,\n      );\n    }\n  }\n\n  private getLimitValue(\n    side: string,\n    layoutContext: Vtree.LayoutContext,\n    clientLayout: Vtree.ClientLayout,\n    condition?: (p1: PageFloatFragment, p2: PageFloatLayoutContext) => boolean,\n  ): number {\n    Asserts.assert(this.container);\n    const logicalSide = this.toLogical(side);\n    const physicalSide = this.toPhysical(side);\n    const limit = this.getLimitValueInner(\n      logicalSide,\n      layoutContext,\n      clientLayout,\n      condition,\n    );\n    if (this.parent && this.parent.container) {\n      const parentLimit = this.parent.getLimitValue(\n        physicalSide,\n        layoutContext,\n        clientLayout,\n        condition,\n      );\n      switch (physicalSide) {\n        case \"top\":\n          return Math.max(limit, parentLimit);\n        case \"left\":\n          return Math.max(limit, parentLimit);\n        case \"bottom\":\n          return Math.min(limit, parentLimit);\n        case \"right\":\n          return Math.min(limit, parentLimit);\n        default:\n          Asserts.fail(\"Should be unreachable\");\n      }\n    }\n    return limit;\n  }\n\n  private getLimitValueInner(\n    logicalSide: string,\n    layoutContext: Vtree.LayoutContext,\n    clientLayout: Vtree.ClientLayout,\n    condition?: (p1: PageFloatFragment, p2: PageFloatLayoutContext) => boolean,\n  ): number {\n    Asserts.assert(this.container);\n    const limits = this.getLimitValuesInner(\n      layoutContext,\n      clientLayout,\n      condition,\n    );\n    switch (logicalSide) {\n      case \"block-start\":\n        return this.container.vertical ? limits.right : limits.top;\n      case \"block-end\":\n        return this.container.vertical ? limits.left : limits.bottom;\n      case \"inline-start\":\n        return this.container.vertical ? limits.top : limits.left;\n      case \"inline-end\":\n        return this.container.vertical ? limits.bottom : limits.right;\n      default:\n        throw new Error(`Unknown logical side: ${logicalSide}`);\n    }\n  }\n\n  private getLimitValuesInner(\n    layoutContext: Vtree.LayoutContext,\n    clientLayout: Vtree.ClientLayout,\n    condition?: (p1: PageFloatFragment, p2: PageFloatLayoutContext) => boolean,\n  ): {\n    top: number;\n    left: number;\n    bottom: number;\n    right: number;\n    floatMinWrapBlockStart: number;\n    floatMinWrapBlockEnd: number;\n  } {\n    Asserts.assert(this.container);\n    const offsetX = this.container.originX;\n    const offsetY = this.container.originY;\n    const paddingRect = this.container.getPaddingRect();\n    let limits = {\n      top: paddingRect.y1 - offsetY,\n      left: paddingRect.x1 - offsetX,\n      bottom: paddingRect.y2 - offsetY,\n      right: paddingRect.x2 - offsetX,\n      floatMinWrapBlockStart: 0,\n      floatMinWrapBlockEnd: 0,\n    };\n\n    function resolveLengthPercentage(numeric, viewNode, containerLength) {\n      if (numeric.unit === \"%\") {\n        return (containerLength * numeric.num) / 100;\n      } else {\n        return layoutContext.convertLengthToPx(numeric, viewNode, clientLayout);\n      }\n    }\n    const fragments = this.floatFragments;\n    if (fragments.length > 0) {\n      limits = fragments.reduce((l, f) => {\n        if (condition && !condition(f, this)) {\n          return l;\n        }\n        const logicalFloatSide = this.toLogical(f.floatSide);\n        const area = f.area;\n        const floatMinWrapBlock = f.continuations[0].float.floatMinWrapBlock;\n        let top = l.top;\n        let left = l.left;\n        let bottom = l.bottom;\n        let right = l.right;\n        let floatMinWrapBlockStart = l.floatMinWrapBlockStart;\n        let floatMinWrapBlockEnd = l.floatMinWrapBlockEnd;\n        switch (logicalFloatSide) {\n          case \"inline-start\":\n            if (area.vertical) {\n              top = Math.max(top, area.top + area.height);\n            } else {\n              left = Math.max(left, area.left + area.width);\n            }\n            break;\n          case \"block-start\":\n            if (area.vertical) {\n              if (floatMinWrapBlock && area.left < right) {\n                floatMinWrapBlockStart = resolveLengthPercentage(\n                  floatMinWrapBlock,\n                  (area as any).rootViewNodes[0],\n                  paddingRect.x2 - paddingRect.x1,\n                ) as number;\n              }\n              right = Math.min(right, area.left);\n            } else {\n              if (floatMinWrapBlock && area.top + area.height > top) {\n                floatMinWrapBlockStart = resolveLengthPercentage(\n                  floatMinWrapBlock,\n                  (area as any).rootViewNodes[0],\n                  paddingRect.y2 - paddingRect.y1,\n                ) as number;\n              }\n              top = Math.max(top, area.top + area.height);\n            }\n            break;\n          case \"inline-end\":\n            if (area.vertical) {\n              bottom = Math.min(bottom, area.top);\n            } else {\n              right = Math.min(right, area.left);\n            }\n            break;\n          case \"block-end\":\n            if (area.vertical) {\n              if (floatMinWrapBlock && area.left + area.width > left) {\n                floatMinWrapBlockEnd = resolveLengthPercentage(\n                  floatMinWrapBlock,\n                  (area as any).rootViewNodes[0],\n                  paddingRect.x2 - paddingRect.x1,\n                ) as number;\n              }\n              left = Math.max(left, area.left + area.width);\n            } else {\n              if (floatMinWrapBlock && area.top < bottom) {\n                floatMinWrapBlockEnd = resolveLengthPercentage(\n                  floatMinWrapBlock,\n                  (area as any).rootViewNodes[0],\n                  paddingRect.y2 - paddingRect.y1,\n                ) as number;\n              }\n              bottom = Math.min(bottom, area.top);\n            }\n            break;\n          default:\n            throw new Error(`Unknown logical float side: ${logicalFloatSide}`);\n        }\n        return {\n          top,\n          left,\n          bottom,\n          right,\n          floatMinWrapBlockStart,\n          floatMinWrapBlockEnd,\n        };\n      }, limits);\n    }\n    limits.left += offsetX;\n    limits.right += offsetX;\n    limits.top += offsetY;\n    limits.bottom += offsetY;\n    return limits;\n  }\n\n  /**\n   * @param anchorEdge Null indicates that the anchor is not in the current\n   *     container.\n   * @return Logical float side (snap-block is resolved when init=false). Null\n   *     indicates that the float area does not fit inside the container\n   */\n  setFloatAreaDimensions(\n    area: LayoutType.PageFloatArea,\n    floatReference: FloatReference,\n    floatSide: string,\n    anchorEdge: number | null,\n    init: boolean,\n    force: boolean,\n    condition: PageFloatPlacementCondition,\n  ): string | null {\n    if (floatReference !== this.floatReference) {\n      const parent = this.getParent(floatReference);\n      return parent.setFloatAreaDimensions(\n        area,\n        floatReference,\n        floatSide,\n        anchorEdge,\n        init,\n        force,\n        condition,\n      );\n    }\n    let logicalFloatSide = this.toLogical(floatSide);\n    if (logicalFloatSide === \"snap-block\") {\n      if (!condition[\"block-start\"] && !condition[\"block-end\"]) {\n        return null;\n      }\n    } else {\n      if (!condition[logicalFloatSide]) {\n        return null;\n      }\n    }\n    Asserts.assert(area.clientLayout);\n    let blockStart = this.getLimitValue(\n      \"block-start\",\n      area.layoutContext,\n      area.clientLayout,\n    );\n    let blockEnd = this.getLimitValue(\n      \"block-end\",\n      area.layoutContext,\n      area.clientLayout,\n    );\n    let inlineStart = this.getLimitValue(\n      \"inline-start\",\n      area.layoutContext,\n      area.clientLayout,\n    );\n    let inlineEnd = this.getLimitValue(\n      \"inline-end\",\n      area.layoutContext,\n      area.clientLayout,\n    );\n    const blockOffset = area.vertical ? area.originX : area.originY;\n    const inlineOffset = area.vertical ? area.originY : area.originX;\n    blockStart = area.vertical\n      ? Math.min(\n          blockStart,\n          area.left +\n            area.getInsetLeft() +\n            area.width +\n            area.getInsetRight() +\n            blockOffset,\n        )\n      : Math.max(blockStart, area.top + blockOffset);\n    blockEnd = area.vertical\n      ? Math.max(blockEnd, area.left + blockOffset)\n      : Math.min(\n          blockEnd,\n          area.top +\n            area.getInsetTop() +\n            area.height +\n            area.getInsetBottom() +\n            blockOffset,\n        );\n\n    function limitBlockStartEndValueWithOpenRect(getRect, rect) {\n      let openRect = getRect(area.bands, rect);\n      if (openRect) {\n        if (area.vertical) {\n          openRect = GeometryUtil.unrotateBox(openRect);\n        }\n        blockStart = area.vertical\n          ? Math.min(blockStart, openRect.x2)\n          : Math.max(blockStart, openRect.y1);\n        blockEnd = area.vertical\n          ? Math.max(blockEnd, openRect.x1)\n          : Math.min(blockEnd, openRect.y2);\n        return true;\n      } else {\n        return force;\n      }\n    }\n    let blockSize: number;\n    let inlineSize: number;\n    let outerBlockSize: number;\n    let outerInlineSize: number;\n    if (init) {\n      const rect = area.vertical\n        ? GeometryUtil.rotateBox(\n            new GeometryUtil.Rect(blockEnd, inlineStart, blockStart, inlineEnd),\n          )\n        : new GeometryUtil.Rect(inlineStart, blockStart, inlineEnd, blockEnd);\n      if (\n        logicalFloatSide === \"block-start\" ||\n        logicalFloatSide === \"snap-block\" ||\n        logicalFloatSide === \"inline-start\"\n      ) {\n        if (\n          !limitBlockStartEndValueWithOpenRect(\n            GeometryUtil.findUppermostFullyOpenRect,\n            rect,\n          )\n        ) {\n          return null;\n        }\n      }\n      if (\n        logicalFloatSide === \"block-end\" ||\n        logicalFloatSide === \"snap-block\" ||\n        logicalFloatSide === \"inline-end\"\n      ) {\n        if (\n          !limitBlockStartEndValueWithOpenRect(\n            GeometryUtil.findBottommostFullyOpenRect,\n            rect,\n          )\n        ) {\n          return null;\n        }\n      }\n      outerBlockSize = (blockEnd - blockStart) * area.getBoxDir();\n      blockSize = outerBlockSize - area.getInsetBefore() - area.getInsetAfter();\n      outerInlineSize = inlineEnd - inlineStart;\n      inlineSize = outerInlineSize - area.getInsetStart() - area.getInsetEnd();\n      if (!force && (blockSize <= 0 || inlineSize <= 0)) {\n        return null;\n      }\n    } else {\n      blockSize = area.computedBlockSize;\n      outerBlockSize = blockSize + area.getInsetBefore() + area.getInsetAfter();\n      const availableBlockSize = (blockEnd - blockStart) * area.getBoxDir();\n      if (logicalFloatSide === \"snap-block\") {\n        if (anchorEdge === null) {\n          // Deferred from previous container\n          logicalFloatSide = \"block-start\";\n        } else {\n          const containerRect = this.container.getPaddingRect();\n          const fromStart =\n            this.container.getBoxDir() *\n            (anchorEdge -\n              (this.container.vertical ? containerRect.x2 : containerRect.y1));\n          const fromEnd =\n            this.container.getBoxDir() *\n            ((this.container.vertical ? containerRect.x1 : containerRect.y2) -\n              anchorEdge -\n              outerBlockSize);\n          if (fromStart <= fromEnd) {\n            logicalFloatSide = \"block-start\";\n          } else {\n            logicalFloatSide = \"block-end\";\n          }\n        }\n        if (!condition[logicalFloatSide]) {\n          if (condition[\"block-end\"]) {\n            logicalFloatSide = \"block-end\";\n          } else {\n            return null;\n          }\n        }\n      }\n      if (!force && availableBlockSize < outerBlockSize) {\n        return null;\n      }\n      if (\n        logicalFloatSide === \"inline-start\" ||\n        logicalFloatSide === \"inline-end\"\n      ) {\n        inlineSize = Sizing.getSize(area.clientLayout, area.element, [\n          Sizing.Size.FIT_CONTENT_INLINE_SIZE,\n        ])[Sizing.Size.FIT_CONTENT_INLINE_SIZE];\n      } else if (area.adjustContentRelativeSize) {\n        inlineSize = area.getContentInlineSize();\n      } else {\n        inlineSize = area.vertical ? area.height : area.width;\n      }\n      outerInlineSize = inlineSize + area.getInsetStart() + area.getInsetEnd();\n      const availableInlineSize = inlineEnd - inlineStart;\n      if (!force && availableInlineSize < outerInlineSize) {\n        return null;\n      }\n    }\n    blockStart -= blockOffset;\n    blockEnd -= blockOffset;\n    inlineStart -= inlineOffset;\n    inlineEnd -= inlineOffset;\n    switch (logicalFloatSide) {\n      case \"inline-start\":\n      case \"block-start\":\n      case \"snap-block\":\n        area.setInlinePosition(inlineStart, inlineSize);\n        area.setBlockPosition(blockStart, blockSize);\n        break;\n      case \"inline-end\":\n      case \"block-end\":\n        area.setInlinePosition(inlineEnd - outerInlineSize, inlineSize);\n        area.setBlockPosition(\n          blockEnd - outerBlockSize * area.getBoxDir(),\n          blockSize,\n        );\n        break;\n      default:\n        throw new Error(`unknown float direction: ${floatSide}`);\n    }\n    return logicalFloatSide;\n  }\n\n  getFloatFragmentExclusions(): GeometryUtil.Shape[] {\n    const result = this.floatFragments.map((fragment) =>\n      fragment.getOuterShape(),\n    );\n    if (this.parent) {\n      return this.parent.getFloatFragmentExclusions().concat(result);\n    } else {\n      return result;\n    }\n  }\n\n  private reattachFloatFragments() {\n    const parent = this.container.element && this.container.element.parentNode;\n    if (parent) {\n      this.floatFragments.forEach((fragment) => {\n        parent.appendChild(fragment.area.element);\n      });\n    }\n  }\n\n  getMaxReachedAfterEdge(): number {\n    const isVertical = this.getContainer().vertical;\n    return this.floatFragments.reduce(\n      (edge, fragment) => {\n        const rect = fragment.getOuterRect();\n        if (isVertical) {\n          return Math.min(edge, rect.x1);\n        } else {\n          return Math.max(edge, rect.y2);\n        }\n      },\n      isVertical ? Infinity : 0,\n    );\n  }\n\n  getBlockStartEdgeOfBlockEndFloats(): number {\n    const isVertical = this.getContainer().vertical;\n    return this.floatFragments\n      .filter((fragment) => fragment.floatSide === \"block-end\")\n      .reduce(\n        (edge, fragment) => {\n          const rect = fragment.getOuterRect();\n          if (isVertical) {\n            return Math.max(edge, rect.x2);\n          } else {\n            return Math.min(edge, rect.y1);\n          }\n        },\n        isVertical ? 0 : Infinity,\n      );\n  }\n\n  getPageFloatClearEdge(clear: string, column: LayoutType.Column): number {\n    function isContinuationOfAlreadyAppearedFloat(context) {\n      return (continuation) =>\n        context.isAnchorAlreadyAppeared(continuation.float.getId());\n    }\n\n    function isFragmentWithAlreadyAppearedFloat(fragment, context) {\n      return fragment.continuations.some(\n        isContinuationOfAlreadyAppearedFloat(context),\n      );\n    }\n    const columnRect = column.getPaddingRect();\n    const columnBlockEnd = column.vertical ? columnRect.x1 : columnRect.y2;\n    let context: PageFloatLayoutContext = this;\n    while (context) {\n      if (\n        context.floatsDeferredToNext.some(\n          isContinuationOfAlreadyAppearedFloat(context),\n        )\n      ) {\n        return columnBlockEnd;\n      }\n      context = context.parent;\n    }\n    Asserts.assert(column.clientLayout);\n    const blockStartLimit = this.getLimitValue(\n      \"block-start\",\n      column.layoutContext,\n      column.clientLayout,\n      isFragmentWithAlreadyAppearedFloat,\n    );\n    const blockEndLimit = this.getLimitValue(\n      \"block-end\",\n      column.layoutContext,\n      column.clientLayout,\n      isFragmentWithAlreadyAppearedFloat,\n    );\n    if (\n      blockEndLimit * column.getBoxDir() <\n      columnBlockEnd * column.getBoxDir()\n    ) {\n      return columnBlockEnd;\n    } else {\n      return blockStartLimit;\n    }\n  }\n\n  getPageFloatPlacementCondition(\n    float: PageFloat,\n    floatSide: string,\n    clearSide: string | null,\n  ): PageFloatPlacementCondition {\n    if (float.floatReference !== this.floatReference) {\n      const parent = this.getParent(float.floatReference);\n      return parent.getPageFloatPlacementCondition(float, floatSide, clearSide);\n    }\n    const result: PageFloatPlacementCondition = {\n      \"block-start\": true,\n      \"block-end\": true,\n      \"inline-start\": true,\n      \"inline-end\": true,\n    };\n    if (!clearSide) {\n      return result;\n    }\n    const logicalFloatSide = this.toLogical(floatSide);\n    const logicalClearSide = this.toLogical(clearSide);\n    let logicalSides: string[];\n    if (logicalClearSide === \"all\") {\n      logicalSides = [\"block-start\", \"block-end\", \"inline-start\", \"inline-end\"];\n    } else if (logicalClearSide === \"both\") {\n      logicalSides = [\"inline-start\", \"inline-end\"];\n    } else if (logicalClearSide === \"same\") {\n      if (logicalFloatSide === \"snap-block\") {\n        logicalSides = [\"block-start\", \"block-end\"];\n      } else {\n        logicalSides = [logicalFloatSide];\n      }\n    } else {\n      logicalSides = [logicalClearSide];\n    }\n    const floatOrder = float.getOrder();\n\n    function isPrecedingFragment(\n      side: string,\n    ): (p1: PageFloatFragment) => boolean {\n      return (fragment) =>\n        fragment.floatSide === side && fragment.getOrder() < floatOrder;\n    }\n\n    function hasPrecedingFragmentInChildren(\n      context: PageFloatLayoutContext,\n      side: string,\n    ): boolean {\n      return context.children.some(\n        (child) =>\n          child.floatFragments.some(isPrecedingFragment(side)) ||\n          hasPrecedingFragmentInChildren(child, side),\n      );\n    }\n\n    function hasPrecedingFragmentInParents(\n      context: PageFloatLayoutContext,\n      side: string,\n    ): boolean {\n      const parent = context.parent;\n      return (\n        !!parent &&\n        (parent.floatFragments.some(isPrecedingFragment(side)) ||\n          hasPrecedingFragmentInParents(parent, side))\n      );\n    }\n    logicalSides.forEach((side) => {\n      switch (side) {\n        case \"block-start\":\n        case \"inline-start\":\n          result[side] = !hasPrecedingFragmentInChildren(this, side);\n          break;\n        case \"block-end\":\n        case \"inline-end\":\n          result[side] = !hasPrecedingFragmentInParents(this, side);\n          break;\n        default:\n          throw new Error(`Unexpected side: ${side}`);\n      }\n    });\n    return result;\n  }\n\n  getLayoutConstraints(): LayoutType.LayoutConstraint[] {\n    const constraints = this.parent ? this.parent.getLayoutConstraints() : [];\n    return constraints.concat(this.layoutConstraints);\n  }\n\n  addLayoutConstraint(\n    layoutConstraint: LayoutType.LayoutConstraint,\n    floatReference: FloatReference,\n  ) {\n    if (floatReference === this.floatReference) {\n      this.layoutConstraints.push(layoutConstraint);\n    } else {\n      this.getParent(floatReference).addLayoutConstraint(\n        layoutConstraint,\n        floatReference,\n      );\n    }\n  }\n\n  isColumnFullWithPageFloats(column: LayoutType.Column): boolean {\n    const layoutContext = column.layoutContext;\n    const clientLayout = column.clientLayout;\n    Asserts.assert(clientLayout);\n    let context: PageFloatLayoutContext = this;\n    let limits: {\n      top: number;\n      left: number;\n      bottom: number;\n      right: number;\n      floatMinWrapBlockStart: number;\n      floatMinWrapBlockEnd: number;\n    } = null;\n    while (context && context.container) {\n      const l = context.getLimitValuesInner(layoutContext, clientLayout);\n      if (limits) {\n        if (column.vertical) {\n          if (l.right < limits.right) {\n            limits.right = l.right;\n            limits.floatMinWrapBlockStart = l.floatMinWrapBlockStart;\n          }\n          if (l.left > limits.left) {\n            limits.left = l.left;\n            limits.floatMinWrapBlockEnd = l.floatMinWrapBlockEnd;\n          }\n        } else {\n          if (l.top > limits.top) {\n            limits.top = l.top;\n            limits.floatMinWrapBlockStart = l.floatMinWrapBlockStart;\n          }\n          if (l.bottom < limits.bottom) {\n            limits.bottom = l.bottom;\n            limits.floatMinWrapBlockEnd = l.floatMinWrapBlockEnd;\n          }\n        }\n      } else {\n        limits = l;\n      }\n      context = context.parent;\n    }\n    const floatMinWrapBlock = Math.max(\n      limits.floatMinWrapBlockStart,\n      limits.floatMinWrapBlockEnd,\n    );\n    const blockSpace = column.vertical\n      ? limits.right - limits.left\n      : limits.bottom - limits.top;\n    return blockSpace <= floatMinWrapBlock;\n  }\n\n  getMaxBlockSizeOfPageFloats(): number {\n    const isVertical = this.getContainer().vertical;\n    if (!this.floatFragments.length) {\n      return 0;\n    }\n    return Math.max.apply(\n      null,\n      this.floatFragments.map((fragment) => {\n        const area = fragment.area;\n        if (isVertical) {\n          return area.width;\n        } else {\n          return area.height;\n        }\n      }),\n    );\n  }\n\n  lock() {\n    this.locked = true;\n  }\n\n  unlock() {\n    this.locked = false;\n  }\n\n  isLocked(): boolean {\n    return this.locked;\n  }\n}\n\nexport interface PageFloatLayoutStrategy\n  extends PageFloats.PageFloatLayoutStrategy {}\n\nconst pageFloatLayoutStrategies: PageFloatLayoutStrategy[] = [];\n\nexport class PageFloatLayoutStrategyResolver {\n  static register(strategy: PageFloatLayoutStrategy) {\n    pageFloatLayoutStrategies.push(strategy);\n  }\n\n  findByNodeContext(nodeContext: Vtree.NodeContext): PageFloatLayoutStrategy {\n    for (let i = pageFloatLayoutStrategies.length - 1; i >= 0; i--) {\n      const strategy = pageFloatLayoutStrategies[i];\n      if (strategy.appliesToNodeContext(nodeContext)) {\n        return strategy;\n      }\n    }\n    throw new Error(`No PageFloatLayoutStrategy found for ${nodeContext}`);\n  }\n\n  findByFloat(float: PageFloat): PageFloatLayoutStrategy {\n    for (let i = pageFloatLayoutStrategies.length - 1; i >= 0; i--) {\n      const strategy = pageFloatLayoutStrategies[i];\n      if (strategy.appliesToFloat(float)) {\n        return strategy;\n      }\n    }\n    throw new Error(`No PageFloatLayoutStrategy found for ${float}`);\n  }\n}\n\nexport class NormalPageFloatLayoutStrategy implements PageFloatLayoutStrategy {\n  /**\n   * @override\n   */\n  appliesToNodeContext(nodeContext: Vtree.NodeContext): boolean {\n    return isPageFloat(nodeContext.floatReference);\n  }\n\n  /**\n   * @override\n   */\n  appliesToFloat(float: PageFloat): boolean {\n    return true;\n  }\n\n  /**\n   * @override\n   */\n  createPageFloat(\n    nodeContext: Vtree.NodeContext,\n    pageFloatLayoutContext: PageFloatLayoutContext,\n    column: LayoutType.Column,\n  ): Task.Result<PageFloat> {\n    let floatReference = nodeContext.floatReference;\n    Asserts.assert(nodeContext.floatSide);\n    const floatSide: string = nodeContext.floatSide;\n    const nodePosition = nodeContext.toNodePosition();\n    return column\n      .resolveFloatReferenceFromColumnSpan(\n        floatReference,\n        nodeContext.columnSpan,\n        nodeContext,\n      )\n      .thenAsync((ref) => {\n        floatReference = ref;\n        Asserts.assert(pageFloatLayoutContext.flowName);\n        const float = new PageFloat(\n          nodePosition,\n          floatReference,\n          floatSide,\n          nodeContext.clearSide,\n          pageFloatLayoutContext.flowName,\n          nodeContext.floatMinWrapBlock,\n        );\n        pageFloatLayoutContext.addPageFloat(float);\n        return Task.newResult(float);\n      });\n  }\n\n  /**\n   * @override\n   */\n  createPageFloatFragment(\n    continuations: PageFloatContinuation[],\n    floatSide: string,\n    floatArea: LayoutType.PageFloatArea,\n    continues: boolean,\n  ): PageFloatFragment {\n    const f = continuations[0].float;\n    return new PageFloatFragment(\n      f.floatReference,\n      floatSide,\n      continuations,\n      floatArea,\n      continues,\n    );\n  }\n\n  /**\n   * @override\n   */\n  findPageFloatFragment(\n    float: PageFloat,\n    pageFloatLayoutContext: PageFloatLayoutContext,\n  ): PageFloatFragment | null {\n    return pageFloatLayoutContext.findPageFloatFragment(float);\n  }\n\n  /**\n   * @override\n   */\n  adjustPageFloatArea(\n    floatArea: LayoutType.PageFloatArea,\n    floatContainer: Vtree.Container,\n    column: LayoutType.Column,\n  ) {}\n\n  /**\n   * @override\n   */\n  forbid(float: PageFloat, pageFloatLayoutContext: PageFloatLayoutContext) {}\n}\n\nPageFloatLayoutStrategyResolver.register(new NormalPageFloatLayoutStrategy());\n","/**\n * Copyright 2017 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Footnotes\n */\nimport * as Asserts from \"./asserts\";\nimport * as Css from \"./css\";\nimport * as PageFloats from \"./page-floats\";\nimport * as Task from \"./task\";\nimport * as Vtree from \"./vtree\";\nimport { Layout } from \"./types\";\n\nconst PageFloatFragment = PageFloats.PageFloatFragment;\n\nexport class Footnote extends PageFloats.PageFloat {\n  constructor(\n    nodePosition: Vtree.NodePosition,\n    floatReference: PageFloats.FloatReference,\n    flowName: string,\n    public readonly footnotePolicy: Css.Ident | null,\n    floatMinWrapBlock: Css.Numeric | null,\n  ) {\n    super(\n      nodePosition,\n      floatReference,\n      \"block-end\",\n      null,\n      flowName,\n      floatMinWrapBlock,\n    );\n  }\n\n  /**\n   * @override\n   */\n  isAllowedToPrecede(other: PageFloats.PageFloat): boolean {\n    return !(other instanceof Footnote);\n  }\n}\n\n/**\n * @extends PageFloatFragment\n */\nexport class FootnoteFragment extends PageFloatFragment {\n  constructor(\n    floatReference: PageFloats.FloatReference,\n    continuations: PageFloats.PageFloatContinuation[],\n    area: Vtree.Container,\n    continues: boolean,\n  ) {\n    super(floatReference, \"block-end\", continuations, area, continues);\n  }\n\n  /**\n   * @override\n   */\n  getOrder(): number {\n    return Infinity;\n  }\n\n  /**\n   * @override\n   */\n  shouldBeStashedBefore(float: PageFloats.PageFloat): boolean {\n    if (float instanceof Footnote) {\n      return true;\n    } else {\n      return this.getOrder() < float.getOrder();\n    }\n  }\n}\n\nexport class LineFootnotePolicyLayoutConstraint\n  implements Layout.LayoutConstraint {\n  constructor(public readonly footnote: Footnote) {}\n\n  allowLayout(nodeContext: Vtree.NodeContext): boolean {\n    const nodePosition = nodeContext.toNodePosition();\n    return !Vtree.isSameNodePosition(nodePosition, this.footnote.nodePosition);\n  }\n}\n\nexport class FootnoteLayoutStrategy\n  implements PageFloats.PageFloatLayoutStrategy {\n  /**\n   * @override\n   */\n  appliesToNodeContext(nodeContext: Vtree.NodeContext): boolean {\n    return nodeContext.floatSide === \"footnote\";\n  }\n\n  /**\n   * @override\n   */\n  appliesToFloat(float: PageFloats.PageFloat): boolean {\n    return float instanceof Footnote;\n  }\n\n  /**\n   * @override\n   */\n  createPageFloat(\n    nodeContext: Vtree.NodeContext,\n    pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    column: Layout.Column,\n  ): Task.Result<PageFloats.PageFloat> {\n    let floatReference = PageFloats.FloatReference.REGION;\n\n    // If the region context has the same container as the page context,\n    // use the page context as the context for the footnote.\n    const regionContext = pageFloatLayoutContext.getPageFloatLayoutContext(\n      floatReference,\n    );\n    const pageContext = pageFloatLayoutContext.getPageFloatLayoutContext(\n      PageFloats.FloatReference.PAGE,\n    );\n    if (pageContext.hasSameContainerAs(regionContext)) {\n      floatReference = PageFloats.FloatReference.PAGE;\n    }\n    const nodePosition = nodeContext.toNodePosition();\n    Asserts.assert(pageFloatLayoutContext.flowName);\n    const float: PageFloats.PageFloat = new Footnote(\n      nodePosition,\n      floatReference,\n      pageFloatLayoutContext.flowName,\n      nodeContext.footnotePolicy,\n      nodeContext.floatMinWrapBlock,\n    );\n    pageFloatLayoutContext.addPageFloat(float);\n    return Task.newResult(float);\n  }\n\n  /**\n   * @override\n   */\n  createPageFloatFragment(\n    continuations: PageFloats.PageFloatContinuation[],\n    floatSide: string,\n    floatArea: Layout.PageFloatArea,\n    continues: boolean,\n  ): PageFloats.PageFloatFragment {\n    const f = continuations[0].float;\n    return new FootnoteFragment(\n      f.floatReference,\n      continuations,\n      floatArea,\n      continues,\n    );\n  }\n\n  /**\n   * @override\n   */\n  findPageFloatFragment(\n    float: PageFloats.PageFloat,\n    pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ): PageFloats.PageFloatFragment | null {\n    const context = pageFloatLayoutContext.getPageFloatLayoutContext(\n      float.floatReference,\n    );\n    const fragments = context.floatFragments.filter(\n      (fr) => fr instanceof FootnoteFragment,\n    );\n    Asserts.assert(fragments.length <= 1);\n    return fragments[0] || null;\n  }\n\n  /**\n   * @override\n   */\n  adjustPageFloatArea(\n    floatArea: Layout.PageFloatArea,\n    floatContainer: Vtree.Container,\n    column: Layout.Column,\n  ) {\n    floatArea.isFootnote = true;\n    floatArea.adjustContentRelativeSize = false;\n    const element = floatArea.element;\n    Asserts.assert(element);\n    floatArea.vertical = column.layoutContext.applyFootnoteStyle(\n      floatContainer.vertical,\n      (column.layoutContext as any).nodeContext &&\n        (column.layoutContext as any).nodeContext.direction === \"rtl\",\n      element,\n    );\n    floatArea.convertPercentageSizesToPx(element);\n    column.setComputedInsets(element, floatArea);\n    column.setComputedWidthAndHeight(element, floatArea);\n  }\n\n  /**\n   * @override\n   */\n  forbid(\n    float: PageFloats.PageFloat,\n    pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ) {\n    const footnote = float as Footnote;\n    switch (footnote.footnotePolicy) {\n      case Css.ident.line: {\n        const constraint = new LineFootnotePolicyLayoutConstraint(footnote);\n        pageFloatLayoutContext.addLayoutConstraint(\n          constraint,\n          footnote.floatReference,\n        );\n        break;\n      }\n    }\n  }\n}\n\nPageFloats.PageFloatLayoutStrategyResolver.register(\n  new FootnoteLayoutStrategy(),\n);\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Break - Control fragmentation.\n */\nimport * as Css from \"./css\";\nimport * as Plugin from \"./plugin\";\n\n/**\n * Convert old page-break-* properties to break-* properties with appropriate\n * values as specified by CSS Fragmentation module:\n * https://drafts.csswg.org/css-break/#page-break-properties\n */\nexport function convertPageBreakAliases(original: {\n  name: string;\n  value: Css.Val;\n  important: boolean;\n}): { name: string; value: Css.Val; important: boolean } {\n  const name = original[\"name\"];\n  const value = original[\"value\"];\n  switch (name) {\n    case \"page-break-before\":\n    case \"page-break-after\":\n    case \"page-break-inside\":\n      return {\n        name: name.replace(/^page-/, \"\"),\n        value: value === Css.ident.always ? Css.ident.page : value,\n        important: original[\"important\"],\n      };\n    default:\n      return original;\n  }\n}\n\nexport const forcedBreakValues: { [key: string]: boolean | null } = {\n  page: true,\n  left: true,\n  right: true,\n  recto: true,\n  verso: true,\n  column: true,\n  region: true,\n};\n\n/**\n * Returns if the value is one of the forced break values.\n * @param value The break value to be judged. Treats null as 'auto'.\n */\nexport function isForcedBreakValue(value: string | null): boolean {\n  return !!forcedBreakValues[value];\n}\n\nexport const avoidBreakValues: { [key: string]: boolean | null } = {\n  avoid: true,\n  \"avoid-page\": true,\n  \"avoid-column\": true,\n  \"avoid-region\": true,\n};\n\n/**\n * Returns if the value is one of the avoid break values.\n * @param value The break value to be judged. Treats null as 'auto'.\n */\nexport function isAvoidBreakValue(value: string | null): boolean {\n  return !!avoidBreakValues[value];\n}\n\n/**\n * Resolves the effective break value given two break values at a single break\n * point. The order of the arguments are relevant, since a value specified on\n * the latter element takes precedence over one on the former. A forced break\n * value is chosen if present. Otherwise, an avoid break value is chosen if\n * present. See CSS Fragmentation Module for the rule:\n *  https://drafts.csswg.org/css-break/#forced-breaks\n *  https://drafts.csswg.org/css-break/#unforced-breaks\n * Note that though the spec requires to honor multiple break values at a single\n * break point, the current implementation choose one of them and discard the\n * others.\n * @param first The break value specified on the former element. null means\n *     'auto' (not specified)\n * @param second The break value specified on the latter element. null means\n *     'auto' (not specified)\n */\nexport function resolveEffectiveBreakValue(\n  first: string | null,\n  second: string | null,\n): string | null {\n  if (!first) {\n    return second;\n  } else if (!second) {\n    return first;\n  } else {\n    const firstIsForcedBreakValue = isForcedBreakValue(first);\n    const secondIsForcedBreakValue = isForcedBreakValue(second);\n    if (firstIsForcedBreakValue && secondIsForcedBreakValue) {\n      switch (second) {\n        case \"column\":\n          // \"column\" is the weakest value\n          return first;\n        case \"region\":\n          // \"region\" is stronger than \"column\" but weaker than page\n          // values\n          return first === \"column\" ? second : first;\n        default:\n          // page values are strongest\n          return second;\n      }\n    } else if (secondIsForcedBreakValue) {\n      return second;\n    } else if (firstIsForcedBreakValue) {\n      return first;\n    } else if (isAvoidBreakValue(second)) {\n      return second;\n    } else if (isAvoidBreakValue(first)) {\n      return first;\n    } else {\n      return second;\n    }\n  }\n}\n\nexport function breakValueToStartSideValue(breakValue: string | null): string {\n  switch (breakValue) {\n    case \"left\":\n    case \"right\":\n    case \"recto\":\n    case \"verso\":\n      return breakValue;\n    default:\n      return \"any\";\n  }\n}\n\nexport function startSideValueToBreakValue(\n  startSideValue: string,\n): string | null {\n  switch (startSideValue) {\n    case \"left\":\n    case \"right\":\n    case \"recto\":\n    case \"verso\":\n      return startSideValue;\n    default:\n      return null;\n  }\n}\n\nPlugin.registerHook(\"SIMPLE_PROPERTY\", convertPageBreakAliases);\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview LayoutHelper - Helper functions of Layout.\n */\nimport * as Base from \"./base\";\nimport * as Logging from \"./logging\";\nimport * as VtreeImpl from \"./vtree\";\nimport { Layout, Vtree } from \"./types\";\n\n/**\n * Though method used to be used as a workaround for Chrome bug, it seems that\n * the bug has been already fixed:\n *   https://bugs.chromium.org/p/chromium/issues/detail?id=297808\n * We now use this method as a workaround for Firefox bug:\n *   https://bugzilla.mozilla.org/show_bug.cgi?id=1159309\n */\nexport function fixBoxesForNode(\n  clientLayout: Vtree.ClientLayout,\n  boxes: Vtree.ClientRect[],\n  node: Node,\n): Vtree.ClientRect[] {\n  const fullRange = node.ownerDocument.createRange();\n  fullRange.setStart(node, 0);\n  fullRange.setEnd(node, node.textContent.length);\n  const fullBoxes = clientLayout.getRangeClientRects(fullRange);\n  const result = [];\n  for (const box of boxes) {\n    let k: number;\n    for (k = 0; k < fullBoxes.length; k++) {\n      const fullBox = fullBoxes[k];\n      if (\n        box.top >= fullBox.top &&\n        box.bottom <= fullBox.bottom &&\n        Math.abs(box.left - fullBox.left) < 1\n      ) {\n        result.push({\n          top: box.top,\n          left: fullBox.left,\n          bottom: box.bottom,\n          right: fullBox.right,\n        });\n        break;\n      }\n    }\n    if (k == fullBoxes.length) {\n      Logging.logger.warn(\"Could not fix character box\");\n      result.push(box);\n    }\n  }\n  return result;\n}\n\n/**\n * Calculate the position of the \"after\" edge in the block-progression\n * dimension. Return 0 if position was determined successfully and return\n * non-zero if position could not be determined and the node should be\n * considered zero-height.\n */\nexport function calculateEdge(\n  nodeContext: Vtree.NodeContext,\n  clientLayout: Vtree.ClientLayout,\n  extraOffset: number,\n  vertical: boolean,\n): number {\n  const node = nodeContext.viewNode;\n  if (!node) {\n    return NaN;\n  }\n  if (node.nodeType == 1) {\n    if (nodeContext.after || !nodeContext.inline) {\n      const cbox = clientLayout.getElementClientRect(node as Element);\n      if (cbox.right >= cbox.left && cbox.bottom >= cbox.top) {\n        if (nodeContext.after) {\n          return vertical ? cbox.left : cbox.bottom;\n        } else {\n          return vertical ? cbox.right : cbox.top;\n        }\n      }\n    }\n    return NaN;\n  } else {\n    let edge = NaN;\n    const range = node.ownerDocument.createRange();\n    const length = node.textContent.length;\n    if (!length) {\n      return NaN;\n    }\n    if (nodeContext.after) {\n      extraOffset += length;\n    }\n    if (extraOffset >= length) {\n      extraOffset = length - 1;\n    }\n    range.setStart(node, extraOffset);\n    range.setEnd(node, extraOffset + 1);\n    let boxes = clientLayout.getRangeClientRects(range);\n    if (vertical && Base.checkVerticalBBoxBug(document.body)) {\n      boxes = fixBoxesForNode(clientLayout, boxes, node);\n    }\n    let maxSize = 0;\n\n    // Get first of the widest boxes (works around Chrome results for soft\n    // hyphens).\n    for (const box of boxes) {\n      const boxSize = vertical ? box.bottom - box.top : box.right - box.left;\n      if (\n        box.right > box.left &&\n        box.bottom > box.top &&\n        (isNaN(edge) || boxSize > maxSize)\n      ) {\n        edge = vertical ? box.left : box.bottom;\n        maxSize = boxSize;\n      }\n    }\n    return edge;\n  }\n}\n\nexport function getElementHeight(\n  element: Element,\n  column: Layout.Column,\n  vertical: boolean,\n): number {\n  const rect = column.clientLayout.getElementClientRect(element);\n  const margin = column.getComputedMargin(element);\n  return vertical\n    ? rect[\"width\"] + margin[\"left\"] + margin[\"right\"]\n    : rect[\"height\"] + margin[\"top\"] + margin[\"bottom\"];\n}\n\nexport function isOrphan(node: Node): boolean {\n  while (node) {\n    if (node.parentNode === node.ownerDocument) {\n      return false;\n    }\n    node = node.parentNode;\n  }\n  return true;\n}\n\nexport function removeFollowingSiblings(\n  parentNode: Node,\n  viewNode: Node,\n): void {\n  if (!parentNode) {\n    return;\n  }\n  let lastChild: Node;\n  while ((lastChild = parentNode.lastChild) != viewNode) {\n    parentNode.removeChild(lastChild);\n  }\n}\n\nexport function isSpecial(e: Element): boolean {\n  return !!e.getAttribute(VtreeImpl.SPECIAL_ATTR);\n}\n\nexport function isSpecialNodeContext(nodeContext: Vtree.NodeContext): boolean {\n  if (!nodeContext) {\n    return false;\n  }\n  const viewNode = nodeContext.viewNode;\n  if (viewNode && viewNode.nodeType === 1) {\n    return isSpecial(viewNode as Element);\n  } else {\n    return false;\n  }\n}\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview BreakPosition - Definitions of BreakPosition.\n */\nimport * as Break from \"./break\";\nimport * as LayoutHelper from \"./layout-helper\";\nimport { Layout, RepetitiveElement, Vtree } from \"./types\";\n\n/**\n * Potential breaking position.\n */\nexport type BreakPosition = Layout.BreakPosition;\n\nexport abstract class AbstractBreakPosition\n  implements Layout.AbstractBreakPosition {\n  abstract findAcceptableBreak(\n    column: Layout.Column,\n    penalty: number,\n  ): Vtree.NodeContext;\n\n  abstract getMinBreakPenalty(): number;\n\n  calculateOffset(column): { current: number; minimum: number } {\n    return calculateOffset(\n      this.getNodeContext(),\n      column.collectElementsOffset(),\n    );\n  }\n\n  /**\n   * @override\n   */\n  breakPositionChosen(column: Layout.Column): void {}\n\n  getNodeContext(): Vtree.NodeContext {\n    return null;\n  }\n}\n\nexport function calculateOffset(\n  nodeContext: Vtree.NodeContext,\n  elementsOffsets: RepetitiveElement.ElementsOffset[],\n): { current: number; minimum: number } {\n  return {\n    current: elementsOffsets.reduce(\n      (val, repetitiveElement) =>\n        val + repetitiveElement.calculateOffset(nodeContext),\n      0,\n    ),\n    minimum: elementsOffsets.reduce(\n      (val, repetitiveElement) =>\n        val + repetitiveElement.calculateMinimumOffset(nodeContext),\n      0,\n    ),\n  };\n}\n\n/**\n * Potential edge breaking position.\n */\nexport class EdgeBreakPosition extends AbstractBreakPosition\n  implements Layout.EdgeBreakPosition {\n  overflowIfRepetitiveElementsDropped: boolean;\n  protected isEdgeUpdated: boolean = false;\n  private edge: number = 0;\n\n  constructor(\n    public readonly position: Vtree.NodeContext,\n    public readonly breakOnEdge: string | null,\n    public overflows: boolean,\n    public readonly computedBlockSize: number,\n  ) {\n    super();\n    this.overflowIfRepetitiveElementsDropped = overflows;\n  }\n\n  /**\n   * @override\n   */\n  findAcceptableBreak(\n    column: Layout.Column,\n    penalty: number,\n  ): Vtree.NodeContext {\n    this.updateOverflows(column);\n    if (penalty < this.getMinBreakPenalty()) {\n      return null;\n    }\n    return column.findEdgeBreakPosition(this);\n  }\n\n  /**\n   * @override\n   */\n  getMinBreakPenalty(): number {\n    if (!this.isEdgeUpdated) {\n      throw new Error(\"EdgeBreakPosition.prototype.updateEdge not called\");\n    }\n    const preferDropping =\n      this.isFirstContentOfRepetitiveElementsOwner() &&\n      !this.overflowIfRepetitiveElementsDropped;\n    return (\n      (Break.isAvoidBreakValue(this.breakOnEdge) ? 1 : 0) +\n      (this.overflows && !preferDropping ? 3 : 0) +\n      (this.position.parent ? this.position.parent.breakPenalty : 0)\n    );\n  }\n\n  private updateEdge(column: Layout.Column) {\n    const clonedPaddingBorder = column.calculateClonedPaddingBorder(\n      this.position,\n    );\n    this.edge =\n      LayoutHelper.calculateEdge(\n        this.position,\n        column.clientLayout,\n        0,\n        column.vertical,\n      ) + clonedPaddingBorder;\n    this.isEdgeUpdated = true;\n  }\n\n  private updateOverflows(column: Layout.Column) {\n    if (!this.isEdgeUpdated) {\n      this.updateEdge(column);\n    }\n    const edge = this.edge;\n    const offsets = this.calculateOffset(column);\n    this.overflowIfRepetitiveElementsDropped = column.isOverflown(\n      edge + (column.vertical ? -1 : 1) * offsets.minimum,\n    );\n    this.overflows = this.position.overflow = column.isOverflown(\n      edge + (column.vertical ? -1 : 1) * offsets.current,\n    );\n  }\n\n  /** @override */\n  getNodeContext(): Vtree.NodeContext {\n    return this.position;\n  }\n\n  private isFirstContentOfRepetitiveElementsOwner(): boolean {\n    const nodeContext = this.getNodeContext();\n    if (!nodeContext || !nodeContext.parent) {\n      return false;\n    }\n    const { formattingContext } = nodeContext.parent;\n    if (\n      !RepetitiveElement.isInstanceOfRepetitiveElementsOwnerFormattingContext(\n        formattingContext,\n      )\n    ) {\n      return false;\n    }\n\n    const repetitiveElements = formattingContext.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return false;\n    }\n    return repetitiveElements.isFirstContentNode(nodeContext);\n  }\n}\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Display - CSS Display Module\n */\nimport * as Css from \"./css\";\n\nexport const FLOW_ROOT_ATTR = \"data-vivliostyle-flow-root\";\n\nexport function isFlowRoot(element: Element): boolean {\n  return element.getAttribute(FLOW_ROOT_ATTR) === \"true\";\n}\n\n/**\n * 'Blockify' a display value.\n * cf. https://drafts.csswg.org/css-display/#transformations\n *     https://drafts.csswg.org/css2/visuren.html#dis-pos-flo\n */\nexport function blockify(display: Css.Ident): Css.Ident {\n  const displayStr = display.toString();\n  let blockifiedStr: string;\n  switch (displayStr) {\n    case \"inline-flex\":\n      blockifiedStr = \"flex\";\n      break;\n    case \"inline-grid\":\n      blockifiedStr = \"grid\";\n      break;\n    case \"inline-table\":\n      blockifiedStr = \"table\";\n      break;\n    case \"inline\":\n    case \"table-row-group\":\n    case \"table-column\":\n    case \"table-column-group\":\n    case \"table-header-group\":\n    case \"table-footer-group\":\n    case \"table-row\":\n    case \"table-cell\":\n    case \"table-caption\":\n    case \"inline-block\":\n      blockifiedStr = \"block\";\n      break;\n    default:\n      blockifiedStr = displayStr;\n  }\n  return Css.getName(blockifiedStr);\n}\n\n/**\n * Judge if the generated box is absolutely positioned.\n */\nexport function isAbsolutelyPositioned(position: Css.Ident): boolean {\n  return position === Css.ident.absolute || position === Css.ident.fixed;\n}\n\n/**\n * Get computed values of display, position and float.\n * cf. https://drafts.csswg.org/css-display/#transformations\n *     https://drafts.csswg.org/css2/visuren.html#dis-pos-flo\n */\nexport function getComputedDislayValue(\n  display: Css.Ident,\n  position: Css.Ident,\n  float: Css.Ident,\n  isRoot: boolean,\n): { display: Css.Ident; position: Css.Ident; float: Css.Ident } {\n  if (display === Css.ident.none) {\n    // no need to convert values when 'display' is 'none'\n  } else if (isAbsolutelyPositioned(position)) {\n    float = Css.ident.none;\n    display = blockify(display);\n  } else if ((float && float !== Css.ident.none) || isRoot) {\n    display = blockify(display);\n  }\n  return { display, position, float };\n}\n\n/**\n * Judges if the generated box is block.\n */\nexport function isBlock(\n  display: Css.Ident,\n  position: Css.Ident,\n  float: Css.Ident,\n  isRoot: boolean,\n): boolean {\n  return (\n    getComputedDislayValue(display, position, float, isRoot).display ===\n    Css.ident.block\n  );\n}\n\nexport function isInlineLevel(display: Css.Ident): boolean {\n  switch (display.toString()) {\n    case \"inline\":\n    case \"inline-block\":\n    case \"inline-list-item\":\n    case \"inline-flex\":\n    case \"inline-grid\":\n    case \"ruby\":\n    case \"inline-table\":\n      return true;\n    default:\n      return false;\n  }\n}\n\nexport function isRubyInternalDisplay(display: Css.Ident): boolean {\n  switch (display.toString()) {\n    case \"ruby-base\":\n    case \"ruby-text\":\n    case \"ruby-base-container\":\n    case \"ruby-text-container\":\n      return true;\n    default:\n      return false;\n  }\n}\n\n/**\n * Judges if the generated box establishes a new block formatting context.\n */\nexport function establishesBFC(\n  display: Css.Ident,\n  position: Css.Ident,\n  float: Css.Ident,\n  overflow: Css.Ident,\n  writingMode?: Css.Ident,\n  parentWritingMode?: Css.Ident,\n  isFlowRoot?: boolean,\n): boolean {\n  writingMode = writingMode || parentWritingMode || Css.ident.horizontal_tb;\n  return (\n    !!isFlowRoot ||\n    (!!float && float !== Css.ident.none) ||\n    isAbsolutelyPositioned(position) ||\n    display === Css.ident.inline_block ||\n    display === Css.ident.table_cell ||\n    display === Css.ident.table_caption ||\n    display == Css.ident.flex ||\n    ((display === Css.ident.block || display === Css.ident.list_item) &&\n      !!overflow &&\n      overflow !== Css.ident.visible) ||\n    (!!parentWritingMode && writingMode !== parentWritingMode)\n  );\n}\n\n/**\n * Judges if the generated box establishes a containing block for descendant\n * boxes with 'position: absolute'.\n */\nexport function establishesCBForAbsolute(position: Css.Ident): boolean {\n  return (\n    position === Css.ident.relative ||\n    position === Css.ident.absolute ||\n    position === Css.ident.fixed\n  );\n}\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview LayoutProcessor - Definitions of LayoutProcessor.\n */\nimport * as BreakPosition from \"./break-position\";\nimport * as Display from \"./display\";\nimport * as LayoutHelper from \"./layout-helper\";\nimport * as Plugin from \"./plugin\";\nimport * as Task from \"./task\";\nimport { FormattingContextType, Layout, LayoutProcessor, Vtree } from \"./types\";\n\n/**\n * Processor doing some special layout (e.g. table layout)\n */\nexport interface LayoutProcessor {\n  /**\n   * Do actual layout in the column starting from given NodeContext.\n   */\n  layout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n    leadingEdge: boolean,\n  ): Task.Result<Vtree.NodeContext>;\n\n  /**\n   * Potential edge breaking position.\n   */\n  createEdgeBreakPosition(\n    position: Vtree.NodeContext,\n    breakOnEdge: string | null,\n    overflows: boolean,\n    columnBlockSize: number,\n  ): Layout.BreakPosition;\n\n  /**\n   * process nodecontext at the start of a non inline element.\n   * @return return true if you skip the subsequent nodes\n   */\n  startNonInlineElementNode(nodeContext: Vtree.NodeContext): boolean;\n\n  /**\n   * process nodecontext after a non inline element.\n   * @return return true if you skip the subsequent nodes\n   */\n  afterNonInlineElementNode(\n    nodeContext: Vtree.NodeContext,\n    stopAtOverflow: boolean,\n  ): boolean;\n\n  /**\n   * @return holing true\n   */\n  finishBreak(\n    column: Layout.Column,\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean>;\n\n  clearOverflownViewNodes(\n    column: Layout.Column,\n    parentNodeContext: Vtree.NodeContext,\n    nodeContext: Vtree.NodeContext,\n    removeSelf: boolean,\n  );\n}\n\n/**\n * Resolver finding an appropriate LayoutProcessor given a formatting context\n */\nexport class LayoutProcessorResolver {\n  /**\n   * Find LayoutProcessor corresponding to given formatting context.\n   */\n  find(formattingContext: Vtree.FormattingContext): LayoutProcessor {\n    const hooks: Plugin.ResolveLayoutProcessorHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.RESOLVE_LAYOUT_PROCESSOR,\n    );\n    for (let i = 0; i < hooks.length; i++) {\n      const processor = hooks[i](formattingContext);\n      if (processor) {\n        return processor;\n      }\n    }\n    throw new Error(\n      `No processor found for a formatting context: ${formattingContext.getName()}`,\n    );\n  }\n}\n\nexport class BlockLayoutProcessor implements LayoutProcessor {\n  /**\n   * @override\n   */\n  layout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n    leadingEdge: boolean,\n  ): Task.Result<Vtree.NodeContext> {\n    if (column.isFloatNodeContext(nodeContext)) {\n      return column.layoutFloatOrFootnote(nodeContext);\n    } else if (column.isBreakable(nodeContext)) {\n      return column.layoutBreakableBlock(nodeContext);\n    } else {\n      return column.layoutUnbreakable(nodeContext);\n    }\n  }\n\n  /**\n   * @override\n   */\n  createEdgeBreakPosition(\n    position: Vtree.NodeContext,\n    breakOnEdge: string | null,\n    overflows: boolean,\n    columnBlockSize: number,\n  ): Layout.BreakPosition {\n    return new BreakPosition.EdgeBreakPosition(\n      position.copy(),\n      breakOnEdge,\n      overflows,\n      columnBlockSize,\n    );\n  }\n\n  /**\n   * @override\n   */\n  startNonInlineElementNode(nodeContext: Vtree.NodeContext): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  afterNonInlineElementNode(\n    nodeContext: Vtree.NodeContext,\n    stopAtOverflow: boolean,\n  ): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  clearOverflownViewNodes(\n    column: Layout.Column,\n    parentNodeContext: Vtree.NodeContext,\n    nodeContext: Vtree.NodeContext,\n    removeSelf: boolean,\n  ) {\n    if (!nodeContext.viewNode) {\n      return;\n    }\n    if (!nodeContext.viewNode.parentNode) {\n      return;\n    }\n    const parentNode = nodeContext.viewNode.parentNode;\n    LayoutHelper.removeFollowingSiblings(parentNode, nodeContext.viewNode);\n    if (removeSelf) {\n      parentNode.removeChild(nodeContext.viewNode);\n    }\n  }\n\n  /**\n   * @return holing true\n   * @override\n   */\n  finishBreak(\n    column: Layout.Column,\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean> {\n    const removeSelf =\n      forceRemoveSelf ||\n      (nodeContext.viewNode != null &&\n        nodeContext.viewNode.nodeType == 1 &&\n        !nodeContext.after);\n    column.clearOverflownViewNodes(nodeContext, removeSelf);\n    if (endOfColumn) {\n      column.fixJustificationIfNeeded(nodeContext, true);\n      column.layoutContext.processFragmentedBlockEdge(\n        removeSelf ? nodeContext : nodeContext.parent,\n      );\n    }\n    return Task.newResult(true);\n  }\n}\n\nexport class BlockFormattingContext\n  implements LayoutProcessor.BlockFormattingContext {\n  formattingContextType: FormattingContextType = \"Block\";\n\n  constructor(private readonly parent: Vtree.FormattingContext) {}\n\n  /**\n   * @override\n   */\n  getName(): string {\n    return \"Block formatting context (BlockFormattingContext)\";\n  }\n\n  /**\n   * @override\n   */\n  isFirstTime(nodeContext: Vtree.NodeContext, firstTime: boolean): boolean {\n    return firstTime;\n  }\n\n  /**\n   * @override\n   */\n  getParent(): Vtree.FormattingContext {\n    return this.parent;\n  }\n\n  /** @override */\n  saveState(): any {}\n\n  /** @override */\n  restoreState(state: any) {}\n}\n\nexport const blockLayoutProcessor = new BlockLayoutProcessor();\n\nexport const isInstanceOfBlockFormattingContext =\n  LayoutProcessor.isInstanceOfBlockFormattingContext;\n\nPlugin.registerHook(\n  Plugin.HOOKS.RESOLVE_FORMATTING_CONTEXT,\n  (nodeContext, firstTime, display, position, floatSide, isRoot) => {\n    const parent = nodeContext.parent;\n    if (!parent && nodeContext.formattingContext) {\n      return null;\n    } else if (\n      parent &&\n      nodeContext.formattingContext !== parent.formattingContext\n    ) {\n      return null;\n    } else if (\n      nodeContext.establishesBFC ||\n      (!nodeContext.formattingContext &&\n        Display.isBlock(display, position, floatSide, isRoot))\n    ) {\n      return new BlockFormattingContext(\n        parent ? parent.formattingContext : null,\n      );\n    } else {\n      return null;\n    }\n  },\n);\n\nPlugin.registerHook(\n  Plugin.HOOKS.RESOLVE_LAYOUT_PROCESSOR,\n  (formattingContext) => {\n    if (formattingContext instanceof BlockFormattingContext) {\n      return blockLayoutProcessor;\n    }\n    return null;\n  },\n);\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview LayoutRetryers - Definitions of LayoutRetryer.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Task from \"./task\";\nimport { Layout, Vtree } from \"./types\";\n\n/**\n * @abstract\n */\nexport abstract class AbstractLayoutRetryer {\n  initialBreakPositions: Layout.BreakPosition[] = null;\n  initialStateOfFormattingContext: Vtree.NodeContext = null;\n  initialPosition: Vtree.NodeContext;\n  initialFragmentLayoutConstraints: Layout.FragmentLayoutConstraint[];\n\n  layout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    this.prepareLayout(nodeContext, column);\n    return this.tryLayout(nodeContext, column);\n  }\n\n  private tryLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const frame = Task.newFrame<Vtree.NodeContext>(\n      \"AbstractLayoutRetryer.tryLayout\",\n    );\n    this.saveState(nodeContext, column);\n    const mode = this.resolveLayoutMode(nodeContext);\n    mode.doLayout(nodeContext, column).then((positionAfter) => {\n      let accepted = mode.accept(positionAfter, column);\n      accepted = mode.postLayout(\n        positionAfter,\n        this.initialPosition,\n        column,\n        accepted,\n      );\n      if (accepted) {\n        frame.finish(positionAfter);\n      } else {\n        Asserts.assert(this.initialPosition);\n        this.clearNodes(this.initialPosition);\n        this.restoreState(nodeContext, column);\n        this.tryLayout(this.initialPosition, column).thenFinish(frame);\n      }\n    });\n    return frame.result();\n  }\n\n  /**\n   * @abstract\n   */\n  abstract resolveLayoutMode(nodeContext: Vtree.NodeContext): Layout.LayoutMode;\n\n  prepareLayout(nodeContext: Vtree.NodeContext, column: Layout.Column) {}\n\n  clearNodes(initialPosition: Vtree.NodeContext) {\n    const viewNode =\n      initialPosition.viewNode || initialPosition.parent.viewNode;\n    let child: Node;\n    while ((child = viewNode.lastChild)) {\n      viewNode.removeChild(child);\n    }\n    let sibling: Node;\n    while ((sibling = viewNode.nextSibling)) {\n      sibling.parentNode.removeChild(sibling);\n    }\n  }\n\n  saveState(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    this.initialPosition = nodeContext.copy();\n    this.initialBreakPositions = [].concat(column.breakPositions);\n    this.initialFragmentLayoutConstraints = [].concat(\n      column.fragmentLayoutConstraints,\n    );\n    if (nodeContext.formattingContext) {\n      this.initialStateOfFormattingContext = nodeContext.formattingContext.saveState();\n    }\n  }\n\n  restoreState(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    column.breakPositions = this.initialBreakPositions;\n    column.fragmentLayoutConstraints = this.initialFragmentLayoutConstraints;\n    if (nodeContext.formattingContext) {\n      nodeContext.formattingContext.restoreState(\n        this.initialStateOfFormattingContext,\n      );\n    }\n  }\n}\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview LayoutUtil - Utilities related to layout.\n */\nimport * as Break from \"./break\";\nimport * as Task from \"./task\";\nimport * as VtreeImpl from \"./vtree\";\nimport { Layout, Vtree } from \"./types\";\n\nexport type LayoutIteratorState = {\n  nodeContext: Vtree.NodeContext;\n  atUnforcedBreak: boolean;\n  break: boolean;\n  leadingEdge?: boolean;\n  breakAtTheEdge?: string | null;\n  onStartEdges?: boolean;\n  leadingEdgeContexts?: Vtree.NodeContext[];\n  lastAfterNodeContext?: Vtree.NodeContext | null;\n};\n\nexport class LayoutIteratorStrategy {\n  initialState(initialNodeContext: Vtree.NodeContext): LayoutIteratorState {\n    return {\n      nodeContext: initialNodeContext,\n      atUnforcedBreak: false,\n      break: false,\n    };\n  }\n\n  startNonDisplayableNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  afterNonDisplayableNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  startIgnoredTextNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  afterIgnoredTextNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  startNonElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  afterNonElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  startInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  afterInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  startNonInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  afterNonInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  finish(state: LayoutIteratorState): void | Task.Result<boolean> {}\n}\n\nexport class LayoutIterator {\n  constructor(\n    private readonly strategy: LayoutIteratorStrategy,\n    private readonly layoutContext: Vtree.LayoutContext,\n  ) {}\n\n  iterate(\n    initialNodeContext: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    const strategy = this.strategy;\n    const state = strategy.initialState(initialNodeContext);\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"LayoutIterator\",\n    );\n    frame\n      .loopWithFrame((loopFrame) => {\n        let r: void | Task.Result<boolean>;\n        while (state.nodeContext) {\n          if (!state.nodeContext.viewNode) {\n            if (state.nodeContext.after) {\n              r = strategy.afterNonDisplayableNode(state);\n            } else {\n              r = strategy.startNonDisplayableNode(state);\n            }\n          } else if (state.nodeContext.viewNode.nodeType !== 1) {\n            if (\n              VtreeImpl.canIgnore(\n                state.nodeContext.viewNode,\n                state.nodeContext.whitespace,\n              )\n            ) {\n              if (state.nodeContext.after) {\n                r = strategy.afterIgnoredTextNode(state);\n              } else {\n                r = strategy.startIgnoredTextNode(state);\n              }\n            } else {\n              if (state.nodeContext.after) {\n                r = strategy.afterNonElementNode(state);\n              } else {\n                r = strategy.startNonElementNode(state);\n              }\n            }\n          } else {\n            if (state.nodeContext.inline) {\n              if (state.nodeContext.after) {\n                r = strategy.afterInlineElementNode(state);\n              } else {\n                r = strategy.startInlineElementNode(state);\n              }\n            } else {\n              if (state.nodeContext.after) {\n                r = strategy.afterNonInlineElementNode(state);\n              } else {\n                r = strategy.startNonInlineElementNode(state);\n              }\n            }\n          }\n          const cont = r && r.isPending() ? r : Task.newResult(true);\n          const nextResult = cont.thenAsync(() => {\n            if (state.break) {\n              return Task.newResult(null);\n            }\n            return this.layoutContext.nextInTree(\n              state.nodeContext,\n              state.atUnforcedBreak,\n            );\n          });\n          if (nextResult.isPending()) {\n            nextResult.then((nextNodeContext) => {\n              if (state.break) {\n                loopFrame.breakLoop();\n              } else {\n                state.nodeContext = nextNodeContext;\n                loopFrame.continueLoop();\n              }\n            });\n            return;\n          } else if (state.break) {\n            loopFrame.breakLoop();\n            return;\n          } else {\n            state.nodeContext = nextResult.get();\n          }\n        }\n        strategy.finish(state);\n        loopFrame.breakLoop();\n      })\n      .then(() => {\n        frame.finish(state.nodeContext);\n      });\n    return frame.result();\n  }\n}\n\nexport class EdgeSkipper extends LayoutIteratorStrategy {\n  constructor(protected readonly leadingEdge?: boolean) {\n    super();\n  }\n\n  startNonInlineBox(state: LayoutIteratorState): void | Task.Result<boolean> {}\n\n  endEmptyNonInlineBox(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {}\n\n  endNonInlineBox(state: LayoutIteratorState): void | Task.Result<boolean> {}\n\n  initialState(initialNodeContext: Vtree.NodeContext): LayoutIteratorState {\n    return {\n      nodeContext: initialNodeContext,\n      atUnforcedBreak: !!this.leadingEdge && initialNodeContext.after,\n      break: false,\n      leadingEdge: this.leadingEdge,\n      breakAtTheEdge: null,\n      onStartEdges: false,\n      leadingEdgeContexts: [],\n      lastAfterNodeContext: null,\n    };\n  }\n\n  /**\n   * @return Returns true if a forced break occurs.\n   */\n  processForcedBreak(\n    state: LayoutIteratorState,\n    column: Layout.Column,\n  ): boolean {\n    const needForcedBreak =\n      !state.leadingEdge && Break.isForcedBreakValue(state.breakAtTheEdge);\n    if (needForcedBreak) {\n      const nodeContext = (state.nodeContext =\n        state.leadingEdgeContexts[0] || state.nodeContext);\n      nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n      column.pageBreakType = state.breakAtTheEdge;\n    }\n    return needForcedBreak;\n  }\n\n  /**\n   * @return Returns true if the node overflows the column.\n   */\n  saveEdgeAndProcessOverflow(\n    state: LayoutIteratorState,\n    column: Layout.Column,\n  ): boolean {\n    const overflow = column.checkOverflowAndSaveEdgeAndBreakPosition(\n      state.lastAfterNodeContext,\n      null,\n      true,\n      state.breakAtTheEdge,\n    );\n    if (overflow) {\n      state.nodeContext = (\n        state.lastAfterNodeContext || state.nodeContext\n      ).modify();\n      state.nodeContext.overflow = true;\n    }\n    return overflow;\n  }\n\n  /**\n   * @returns Returns true if the layout constraint is violated.\n   */\n  processLayoutConstraint(\n    state: LayoutIteratorState,\n    layoutConstraint: Layout.LayoutConstraint,\n    column: Layout.Column,\n  ): boolean {\n    let nodeContext = state.nodeContext;\n    const violateConstraint = !layoutConstraint.allowLayout(nodeContext);\n    if (violateConstraint) {\n      column.checkOverflowAndSaveEdgeAndBreakPosition(\n        state.lastAfterNodeContext,\n        null,\n        false,\n        state.breakAtTheEdge,\n      );\n      nodeContext = state.nodeContext = nodeContext.modify();\n      nodeContext.overflow = true;\n    }\n    return violateConstraint;\n  }\n\n  /**\n   * @override\n   */\n  startNonElementNode(state: LayoutIteratorState): void | Task.Result<boolean> {\n    state.onStartEdges = false;\n  }\n\n  /**\n   * @override\n   */\n  startNonInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    state.leadingEdgeContexts.push(state.nodeContext.copy());\n    state.breakAtTheEdge = Break.resolveEffectiveBreakValue(\n      state.breakAtTheEdge,\n      state.nodeContext.breakBefore,\n    );\n    state.onStartEdges = true;\n    return this.startNonInlineBox(state);\n  }\n\n  /**\n   * @override\n   */\n  afterNonInlineElementNode(\n    state: LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    let r: void | Task.Result<boolean>;\n    let cont: Task.Result<boolean>;\n    if (state.onStartEdges) {\n      r = this.endEmptyNonInlineBox(state);\n      cont = r && r.isPending() ? r : Task.newResult(true);\n      cont = cont.thenAsync(() => {\n        if (!state.break) {\n          state.leadingEdgeContexts = [];\n          state.leadingEdge = false;\n          state.atUnforcedBreak = false;\n          state.breakAtTheEdge = null;\n        }\n        return Task.newResult(true);\n      });\n    } else {\n      r = this.endNonInlineBox(state);\n      cont = r && r.isPending() ? r : Task.newResult(true);\n    }\n    return cont.thenAsync(() => {\n      if (!state.break) {\n        state.onStartEdges = false;\n        state.lastAfterNodeContext = state.nodeContext.copy();\n        state.breakAtTheEdge = Break.resolveEffectiveBreakValue(\n          state.breakAtTheEdge,\n          state.nodeContext.breakAfter,\n        );\n      }\n      return Task.newResult(true);\n    });\n  }\n}\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Shared - Global variables of Vivliostyle.js\n */\nimport { RepetitiveElement } from \"./types\";\n\nexport let repetitiveElementsCache: {\n  root: Element;\n  elements: RepetitiveElement.RepetitiveElements;\n}[] = [];\n\nexport function clearRepetitiveElementsCache(): void {\n  repetitiveElementsCache = [];\n}\n","/**\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview PseudoElement - CSS pseudo elements.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssStyler from \"./css-styler\";\nimport * as Exprs from \"./exprs\";\nimport * as Vtree from \"./vtree\";\nimport { PseudoElement } from \"./types\";\n\nexport const document = new DOMParser().parseFromString(\n  `<root xmlns=\"${Base.NS.SHADOW}\"/>`,\n  \"text/xml\",\n);\n\n/**\n * Pseudoelement names in the order they should be inserted in the shadow DOM,\n * empty string is the place where the element's DOM children are processed.\n */\nexport const pseudoNames = [\n  \"footnote-marker\",\n  \"first-5-lines\",\n  \"first-4-lines\",\n  \"first-3-lines\",\n  \"first-2-lines\",\n  \"first-line\",\n  \"first-letter\",\n  \"before\",\n  \"\",\n  /* content */\n  \"after\",\n];\n\nexport const PSEUDO_ATTR = \"data-adapt-pseudo\";\n\nexport function getPseudoName(element: Element): string {\n  return element.getAttribute(PSEUDO_ATTR) || \"\";\n}\n\nexport function setPseudoName(element: Element, name: string): void {\n  element.setAttribute(PSEUDO_ATTR, name);\n}\n\nexport class PseudoelementStyler implements PseudoElement.PseudoelementStyler {\n  contentProcessed: { [key: string]: boolean } = {};\n\n  // after content: update style\n\n  constructor(\n    public readonly element: Element,\n    public style: CssCascade.ElementStyle,\n    public styler: CssStyler.AbstractStyler,\n    public readonly context: Exprs.Context,\n    public readonly exprContentListener: Vtree.ExprContentListener,\n  ) {}\n\n  /**\n   * @override\n   */\n  getStyle(element: Element, deep: boolean): CssCascade.ElementStyle {\n    const pseudoName = getPseudoName(element);\n    if (this.styler && pseudoName && pseudoName.match(/after$/)) {\n      this.style = this.styler.getStyle(this.element, true);\n      this.styler = null;\n    }\n    const pseudoMap = CssCascade.getStyleMap(this.style, \"_pseudos\");\n    const style = pseudoMap[pseudoName] || ({} as CssCascade.ElementStyle);\n    if (pseudoName.match(/^first-/) && !style[\"x-first-pseudo\"]) {\n      let nest = 1;\n      let r: RegExpMatchArray;\n      if (pseudoName == \"first-letter\") {\n        nest = 0;\n      } else if ((r = pseudoName.match(/^first-([0-9]+)-lines$/)) != null) {\n        nest = (r[1] as any) - 0;\n      }\n      style[\"x-first-pseudo\"] = new CssCascade.CascadeValue(\n        new Css.Int(nest),\n        0,\n      );\n    }\n    return style;\n  }\n\n  /**\n   * @override\n   */\n  processContent(element: Element, styles: { [key: string]: Css.Val }) {\n    const pseudoName = getPseudoName(element);\n    if (!this.contentProcessed[pseudoName]) {\n      this.contentProcessed[pseudoName] = true;\n      const contentVal = styles[\"content\"];\n      if (contentVal) {\n        if (Vtree.nonTrivialContent(contentVal)) {\n          contentVal.visit(\n            new Vtree.ContentPropertyHandler(\n              element,\n              this.context,\n              contentVal,\n              this.exprContentListener,\n            ),\n          );\n        }\n      }\n    }\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Layout - Fills a column with styled content.\n * This file does not communicate with the styling system directly.\n * Instead it goes through the layout interface that gives it one view tree\n * node at a time.\n */\nimport * as LayoutRetryers from \"./layout-retryers\";\nimport * as Asserts from \"./asserts\";\nimport * as Shared from \"./shared\";\nimport * as Sizing from \"./sizing\";\nimport * as Break from \"./break\";\nimport * as Logging from \"./logging\";\nimport * as Diff from \"./diff\";\nimport * as Base from \"./base\";\nimport * as BreakPosition from \"./break-position\";\nimport * as Css from \"./css\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as LayoutHelper from \"./layout-helper\";\nimport * as LayoutProcessor from \"./layout-processor\";\nimport * as PageFloats from \"./page-floats\";\nimport * as Plugin from \"./plugin\";\nimport * as Matchers from \"./matchers\";\nimport * as PseudoElement from \"./pseudo-element\";\nimport * as Task from \"./task\";\nimport * as Vgen from \"./vgen\";\nimport * as VtreeImpl from \"./vtree\";\nimport {\n  FragmentLayoutConstraintType,\n  Layout,\n  RepetitiveElement,\n  Selectors,\n  Table,\n  Vtree,\n} from \"./types\";\n\nexport const isInstanceOfAfterIfContinuesLayoutConstraint =\n  Selectors.isInstanceOfAfterIfContinuesLayoutConstraint;\nexport const registerFragmentIndex =\n  Matchers.NthFragmentMatcher.registerFragmentIndex;\nexport const clearFragmentIndices =\n  Matchers.NthFragmentMatcher.clearFragmentIndices;\n\nexport class AfterIfContinues implements Selectors.AfterIfContinues {\n  constructor(\n    public readonly sourceNode: Element,\n    public readonly styler: PseudoElement.PseudoelementStyler,\n  ) {}\n\n  createElement(\n    column: Layout.Column,\n    parentNodeContext: Vtree.NodeContext,\n  ): Task.Result<Element> {\n    const doc = parentNodeContext.viewNode.ownerDocument;\n    const viewRoot = doc.createElement(\"div\");\n    const pseudoColumn = new PseudoColumn(column, viewRoot, parentNodeContext);\n    const initialPageBreakType = pseudoColumn.getColumn().pageBreakType;\n    pseudoColumn.getColumn().pageBreakType = null;\n    return pseudoColumn\n      .layout(this.createNodePositionForPseudoElement(), true)\n      .thenAsync(() => {\n        this.styler.contentProcessed[\"after-if-continues\"] = false;\n        pseudoColumn.getColumn().pageBreakType = initialPageBreakType;\n        const pseudoElement = viewRoot.firstChild as Element;\n        Base.setCSSProperty(pseudoElement, \"display\", \"block\");\n        return Task.newResult(pseudoElement);\n      });\n  }\n\n  private createNodePositionForPseudoElement(): Vtree.ChunkPosition {\n    const sourceNode = PseudoElement.document.createElementNS(\n      Base.NS.XHTML,\n      \"div\",\n    );\n    PseudoElement.setPseudoName(sourceNode, \"after-if-continues\");\n    const shadowContext = this.createShadowContext(sourceNode);\n    const step = {\n      node: sourceNode,\n      shadowType: shadowContext.type,\n      shadowContext,\n      nodeShadow: null,\n      shadowSibling: null,\n    };\n    const nodePosition = {\n      steps: [step],\n      offsetInNode: 0,\n      after: false,\n      preprocessedTextContent: null,\n    };\n    return new VtreeImpl.ChunkPosition(nodePosition as any);\n  }\n\n  private createShadowContext(root: Element): Vtree.ShadowContext {\n    return new VtreeImpl.ShadowContext(\n      this.sourceNode,\n      root,\n      null,\n      null,\n      null,\n      Vtree.ShadowType.ROOTED,\n      this.styler,\n    );\n  }\n}\n\nexport class AfterIfContinuesLayoutConstraint\n  implements Selectors.AfterIfContinuesLayoutConstraint {\n  flagmentLayoutConstraintType: FragmentLayoutConstraintType =\n    \"AfterIfContinue\";\n\n  constructor(\n    public nodeContext: Vtree.NodeContext,\n    public afterIfContinues: Selectors.AfterIfContinues,\n    public pseudoElementHeight: number,\n  ) {}\n\n  /** @override */\n  allowLayout(\n    nodeContext: Vtree.NodeContext,\n    overflownNodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): boolean {\n    if (\n      (overflownNodeContext && !nodeContext) ||\n      (nodeContext && nodeContext.overflow)\n    ) {\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /** @override */\n  nextCandidate(nodeContext: Vtree.NodeContext): boolean {\n    return false;\n  }\n\n  /** @override */\n  postLayout(\n    allowed: boolean,\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: Layout.Column,\n  ) {}\n\n  /** @override */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<boolean> {\n    if (!this.getRepetitiveElements().affectTo(nodeContext)) {\n      return Task.newResult(true);\n    }\n    return this.afterIfContinues\n      .createElement(column, this.nodeContext)\n      .thenAsync((element) => {\n        this.nodeContext.viewNode.appendChild(element);\n        return Task.newResult(true);\n      });\n  }\n\n  getRepetitiveElements() {\n    return new AfterIfContinuesElementsOffset(\n      this.nodeContext,\n      this.pseudoElementHeight,\n    );\n  }\n\n  /** @override */\n  equalsTo(constraint: Layout.FragmentLayoutConstraint): boolean {\n    if (!(constraint instanceof AfterIfContinuesLayoutConstraint)) {\n      return false;\n    }\n    return (\n      this.afterIfContinues ==\n      (constraint as AfterIfContinuesLayoutConstraint).afterIfContinues\n    );\n  }\n\n  /** @override */\n  getPriorityOfFinishBreak(): number {\n    return 9;\n  }\n}\n\nexport class AfterIfContinuesElementsOffset\n  implements Selectors.AfterIfContinuesElementsOffset {\n  constructor(public nodeContext, public pseudoElementHeight) {}\n\n  /** @override */\n  calculateOffset(nodeContext: Vtree.NodeContext): number {\n    if (!this.affectTo(nodeContext)) {\n      return 0;\n    }\n    return this.pseudoElementHeight;\n  }\n\n  /** @override */\n  calculateMinimumOffset(nodeContext: Vtree.NodeContext): number {\n    return this.calculateOffset(nodeContext);\n  }\n\n  affectTo(nodeContext: Vtree.NodeContext): boolean {\n    if (!nodeContext) {\n      return false;\n    }\n    const sourceNode = nodeContext.shadowContext\n      ? nodeContext.shadowContext.owner\n      : nodeContext.sourceNode;\n    if (sourceNode === this.nodeContext.sourceNode) {\n      return !!nodeContext.after;\n    }\n    for (let n = sourceNode.parentNode; n; n = n.parentNode) {\n      if (n === this.nodeContext.sourceNode) {\n        return true;\n      }\n    }\n    return false;\n  }\n}\n\nfunction processAfterIfContinuesOfNodeContext(\n  nodeContext: Vtree.NodeContext,\n  column: Layout.Column,\n): Task.Result<Vtree.NodeContext> {\n  if (\n    !nodeContext ||\n    !nodeContext.afterIfContinues ||\n    nodeContext.after ||\n    column.isFloatNodeContext(nodeContext)\n  ) {\n    return Task.newResult(nodeContext);\n  }\n  const afterIfContinues = nodeContext.afterIfContinues;\n  return afterIfContinues\n    .createElement(column, nodeContext)\n    .thenAsync((pseudoElement) => {\n      Asserts.assert(nodeContext !== null);\n      const pseudoElementHeight = calculatePseudoElementHeight(\n        nodeContext,\n        column,\n        pseudoElement,\n      );\n      column.fragmentLayoutConstraints.push(\n        new AfterIfContinuesLayoutConstraint(\n          nodeContext as Vtree.NodeContext,\n          afterIfContinues,\n          pseudoElementHeight,\n        ),\n      );\n      return Task.newResult(nodeContext);\n    });\n}\n\nexport function processAfterIfContinues(\n  result: Task.Result<Vtree.NodeContext>,\n  column: Layout.Column,\n): Task.Result<Vtree.NodeContext> {\n  return result.thenAsync((nodeContext) =>\n    processAfterIfContinuesOfNodeContext(nodeContext, column),\n  );\n}\n\nexport function processAfterIfContinuesOfAncestors(\n  nodeContext: Vtree.NodeContext,\n  column: Layout.Column,\n): Task.Result<boolean> {\n  const frame: Task.Frame<boolean> = Task.newFrame(\n    \"processAfterIfContinuesOfAncestors\",\n  );\n  let current: Vtree.NodeContext = nodeContext;\n  frame\n    .loop(() => {\n      if (current !== null) {\n        const result = processAfterIfContinuesOfNodeContext(current, column);\n        current = current.parent;\n        return result.thenReturn(true);\n      } else {\n        return Task.newResult(false);\n      }\n    })\n    .then(() => {\n      frame.finish(true);\n    });\n  return frame.result();\n}\n\nexport function calculatePseudoElementHeight(\n  nodeContext: Vtree.NodeContext,\n  column: Layout.Column,\n  pseudoElement: Element,\n): number {\n  const parentNode = nodeContext.viewNode as Element;\n  parentNode.appendChild(pseudoElement);\n  const height = LayoutHelper.getElementHeight(\n    pseudoElement,\n    column,\n    nodeContext.vertical,\n  );\n  parentNode.removeChild(pseudoElement);\n  return height;\n}\n\nexport const mediaTags = {\n  img: true,\n  svg: true,\n  audio: true,\n  video: true,\n};\n\n/**\n * Represents a constraint on layout\n */\nexport type LayoutConstraint = Layout.LayoutConstraint;\n\n/**\n * Represents a constraint that allows layout if all the constraints it contains\n * allow layout.\n */\nexport class AllLayoutConstraint implements LayoutConstraint {\n  constructor(public readonly constraints: LayoutConstraint[]) {}\n\n  /**\n   * @override\n   */\n  allowLayout(nodeContext: Vtree.NodeContext): boolean {\n    return this.constraints.every((c) => c.allowLayout(nodeContext));\n  }\n}\n\n/**\n * Represents constraints on laying out fragments\n */\nexport type FragmentLayoutConstraint = Layout.FragmentLayoutConstraint;\n\nexport type BreakPositionAndNodeContext = Layout.BreakPositionAndNodeContext;\n\n/**\n * Potential breaking position inside CSS box (between lines).\n * @param checkPoints array of breaking points for breakable block\n */\nexport class BoxBreakPosition extends BreakPosition.AbstractBreakPosition\n  implements Layout.BoxBreakPosition {\n  private alreadyEvaluated: boolean = false;\n  breakNodeContext: Vtree.NodeContext = null;\n\n  constructor(\n    public readonly checkPoints: Vtree.NodeContext[],\n    public readonly penalty: number,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  findAcceptableBreak(column: Column, penalty: number): Vtree.NodeContext {\n    if (penalty < this.getMinBreakPenalty()) {\n      return null;\n    }\n    if (!this.alreadyEvaluated) {\n      this.breakNodeContext = column.findBoxBreakPosition(this, penalty > 0);\n      this.alreadyEvaluated = true;\n    }\n    return this.breakNodeContext;\n  }\n\n  /**\n   * @override\n   */\n  getMinBreakPenalty(): number {\n    return this.penalty;\n  }\n\n  /** @override */\n  getNodeContext(): Vtree.NodeContext {\n    return this.alreadyEvaluated\n      ? this.breakNodeContext\n      : this.checkPoints[this.checkPoints.length - 1];\n  }\n}\n\nexport function validateCheckPoints(checkPoints: Vtree.NodeContext[]): void {\n  for (let i = 1; i < checkPoints.length; i++) {\n    const cp0 = checkPoints[i - 1];\n    const cp1 = checkPoints[i];\n    if (cp0 === cp1) {\n      Logging.logger.warn(\"validateCheckPoints: duplicate entry\");\n    } else if (cp0.boxOffset >= cp1.boxOffset) {\n      Logging.logger.warn(\"validateCheckPoints: incorrect boxOffset\");\n    } else if (cp0.sourceNode == cp1.sourceNode) {\n      if (cp1.after) {\n        if (cp0.after) {\n          Logging.logger.warn(\"validateCheckPoints: duplicate after points\");\n        }\n      } else {\n        if (!cp0.after) {\n          if (\n            cp1.boxOffset - cp0.boxOffset !=\n            cp1.offsetInNode - cp0.offsetInNode\n          ) {\n            Logging.logger.warn(\n              \"validateCheckPoints: boxOffset inconsistent with offsetInNode\",\n            );\n          }\n        }\n      }\n    }\n  }\n}\n\nexport function isSpecialInlineDisplay(display: string): boolean {\n  switch (display) {\n    case \"ruby\":\n    case \"inline-block\":\n    case \"inline-flex\":\n    case \"inline-grid\":\n    case \"inline-list-item\":\n    case \"inline-table\":\n      return true;\n  }\n  return false;\n}\n\nexport class Column extends VtreeImpl.Container implements Layout.Column {\n  last: Node;\n  viewDocument: Document;\n  flowRootFormattingContext: Vtree.FormattingContext = null;\n  isFloat: boolean = false;\n  isFootnote: boolean = false;\n  startEdge: number = 0;\n  endEdge: number = 0;\n  beforeEdge: number = 0;\n  afterEdge: number = 0;\n  footnoteEdge: number = 0;\n  box: GeometryUtil.Rect = null;\n  chunkPositions: Vtree.ChunkPosition[] = null;\n  bands: GeometryUtil.Band[] = null;\n  overflown: boolean = false;\n  breakPositions: BreakPosition.BreakPosition[] = null;\n  pageBreakType: string | null = null;\n  forceNonfitting: boolean = true;\n  leftFloatEdge: number = 0; // bottom of the bottommost left float\n  rightFloatEdge: number = 0; // bottom of the bottommost right float\n  bottommostFloatTop: number = 0; // Top of the bottommost float\n  stopAtOverflow: boolean = true;\n  lastAfterPosition: Vtree.NodePosition | null = null;\n  fragmentLayoutConstraints: FragmentLayoutConstraint[] = [];\n  pseudoParent: Column = null;\n  nodeContextOverflowingDueToRepetitiveElements: Vtree.NodeContext | null = null;\n  blockDistanceToBlockEndFloats: number = NaN;\n  computedBlockSize: number;\n\n  constructor(\n    element: Element,\n    public layoutContext: Vtree.LayoutContext,\n    public clientLayout: Vtree.ClientLayout,\n    public readonly layoutConstraint: LayoutConstraint,\n    public readonly pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ) {\n    super(element);\n    this.last = element.lastChild;\n    this.viewDocument = element.ownerDocument;\n    pageFloatLayoutContext.setContainer(this);\n  }\n\n  getTopEdge(): number {\n    return this.vertical ? this.startEdge : this.beforeEdge;\n  }\n\n  getBottomEdge(): number {\n    return this.vertical ? this.endEdge : this.afterEdge;\n  }\n\n  getLeftEdge(): number {\n    return this.vertical ? this.afterEdge : this.startEdge;\n  }\n\n  getRightEdge(): number {\n    return this.vertical ? this.beforeEdge : this.endEdge;\n  }\n\n  isFloatNodeContext(nodeContext: Vtree.NodeContext): boolean {\n    return !!nodeContext.floatSide && (!this.isFloat || !!nodeContext.parent);\n  }\n\n  stopByOverflow(nodeContext: Vtree.NodeContext): boolean {\n    return this.stopAtOverflow && !!nodeContext && nodeContext.overflow;\n  }\n\n  isOverflown(edge: number): boolean {\n    if (this.vertical) {\n      return edge < this.footnoteEdge;\n    } else {\n      return edge > this.footnoteEdge;\n    }\n  }\n\n  getExclusions(): GeometryUtil.Shape[] {\n    const pageFloatExclusions = this.pageFloatLayoutContext.getFloatFragmentExclusions();\n    return this.exclusions.concat(pageFloatExclusions);\n  }\n\n  openAllViews(position: Vtree.NodePosition): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"openAllViews\");\n    const steps = position.steps;\n    self.layoutContext.setViewRoot(self.element, self.isFootnote);\n    let stepIndex = steps.length - 1;\n    let nodeContext: Vtree.NodeContext = null;\n    frame\n      .loop(() => {\n        while (stepIndex >= 0) {\n          const prevContext = nodeContext;\n          const step = steps[stepIndex];\n          nodeContext = VtreeImpl.makeNodeContextFromNodePositionStep(\n            step,\n            prevContext,\n          );\n          if (\n            stepIndex === steps.length - 1 &&\n            !nodeContext.formattingContext\n          ) {\n            nodeContext.formattingContext = self.flowRootFormattingContext;\n          }\n          if (stepIndex == 0) {\n            nodeContext.offsetInNode = self.calculateOffsetInNodeForNodeContext(\n              position,\n            );\n            nodeContext.after = position.after;\n            nodeContext.preprocessedTextContent =\n              position.preprocessedTextContent;\n            if (nodeContext.after) {\n              break;\n            }\n          }\n          const r = self.layoutContext.setCurrent(\n            nodeContext,\n            stepIndex == 0 && nodeContext.offsetInNode == 0,\n          );\n          stepIndex--;\n          if (r.isPending()) {\n            return r;\n          }\n        }\n        return Task.newResult(false);\n      })\n      .then(() => {\n        Asserts.assert(nodeContext);\n        frame.finish(nodeContext);\n      });\n    return frame.result();\n  }\n\n  calculateOffsetInNodeForNodeContext(position: Vtree.NodePosition): number {\n    return position.preprocessedTextContent\n      ? Diff.resolveNewIndex(\n          position.preprocessedTextContent,\n          position.offsetInNode,\n        )\n      : position.offsetInNode;\n  }\n\n  /**\n   * @param count first-XXX nesting identifier\n   */\n  maybePeelOff(\n    position: Vtree.NodeContext,\n    count: number,\n  ): Task.Result<Vtree.NodeContext> {\n    if (\n      position.firstPseudo &&\n      position.inline &&\n      !position.after &&\n      position.firstPseudo.count == 0\n    ) {\n      // first char\n      if (position.viewNode.nodeType != 1) {\n        const text = position.viewNode.textContent;\n        const r = text.match(firstCharPattern);\n        return this.layoutContext.peelOff(position, r[0].length);\n      }\n    }\n    return Task.newResult(position) as Task.Result<Vtree.NodeContext>;\n  }\n\n  /**\n   * Builds the view until a CSS box edge is reached.\n   * @param position start source position.\n   * @param checkPoints array to append possible breaking points.\n   * @return holding box edge position reached or null if the source is exhausted.\n   */\n  buildViewToNextBlockEdge(\n    position: Vtree.NodeContext,\n    checkPoints: Vtree.NodeContext[],\n  ): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    let violateConstraint = false;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"buildViewToNextBlockEdge\",\n    );\n    frame\n      .loopWithFrame((bodyFrame) => {\n        if (position.viewNode && !LayoutHelper.isSpecialNodeContext(position)) {\n          checkPoints.push(position.copy());\n        }\n        self.maybePeelOff(position, 0).then((position1Param) => {\n          const position1 = position1Param as Vtree.NodeContext;\n          if (position1 !== position) {\n            position = position1;\n            if (!LayoutHelper.isSpecialNodeContext(position)) {\n              checkPoints.push(position.copy());\n            }\n          }\n          self.nextInTree(position).then((positionParam) => {\n            position = positionParam as Vtree.NodeContext;\n            if (!position) {\n              // Exit the loop\n              bodyFrame.breakLoop();\n              return;\n            }\n            if (\n              violateConstraint ||\n              !self.layoutConstraint.allowLayout(position)\n            ) {\n              violateConstraint = true;\n              position = position.modify();\n              position.overflow = true;\n            }\n            if (self.isFloatNodeContext(position) && !self.vertical) {\n              self.layoutFloatOrFootnote(position).then((positionParam) => {\n                position = positionParam as Vtree.NodeContext;\n                if (self.pageFloatLayoutContext.isInvalidated()) {\n                  position = null;\n                }\n                if (!position) {\n                  bodyFrame.breakLoop();\n                  return;\n                }\n                bodyFrame.continueLoop();\n              });\n            } else if (!position.inline) {\n              // Exit the loop\n              bodyFrame.breakLoop();\n            } else {\n              // Continue the loop\n              bodyFrame.continueLoop();\n            }\n          });\n        });\n      })\n      .then(() => {\n        frame.finish(position);\n      });\n    return frame.result();\n  }\n\n  nextInTree(\n    position: Vtree.NodeContext,\n    atUnforcedBreak?: boolean,\n  ): Task.Result<Vtree.NodeContext> {\n    const cont = this.layoutContext.nextInTree(position, atUnforcedBreak);\n    return processAfterIfContinues(cont, this);\n  }\n\n  /**\n   * Builds the view for a single unbreakable element.\n   * @param position start source position.\n   * @return holding box edge position reached or null if the source is exhausted.\n   */\n  buildDeepElementView(\n    position: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    if (!position.viewNode) {\n      return Task.newResult(position);\n    }\n    let checkPoints: Vtree.NodeContext[] = [];\n    const sourceNode = position.sourceNode;\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"buildDeepElementView\",\n    );\n\n    // TODO: end the loop based on depth, not sourceNode comparison\n    frame\n      .loopWithFrame((bodyFrame) => {\n        if (\n          position.viewNode &&\n          position.inline &&\n          !LayoutHelper.isSpecialNodeContext(position)\n        ) {\n          checkPoints.push(position.copy());\n        } else {\n          if (checkPoints.length > 0) {\n            self.postLayoutBlock(position, checkPoints);\n          }\n          checkPoints = [];\n        }\n        self.maybePeelOff(position, 0).then((position1Param) => {\n          const position1 = position1Param as Vtree.NodeContext;\n          if (position1 !== position) {\n            let p = position1;\n            while (p && p.sourceNode != sourceNode) {\n              p = p.parent;\n            }\n            if (p == null) {\n              // outside of the subtree\n              position = position1;\n              bodyFrame.breakLoop();\n              return;\n            }\n            if (!LayoutHelper.isSpecialNodeContext(position1)) {\n              checkPoints.push(position1.copy());\n            }\n          }\n          self.nextInTree(position1).then((positionParam) => {\n            position = positionParam as Vtree.NodeContext;\n            if (!position || position.sourceNode == sourceNode) {\n              bodyFrame.breakLoop();\n            } else if (!self.layoutConstraint.allowLayout(position)) {\n              position = position.modify();\n              position.overflow = true;\n              if (self.stopAtOverflow) {\n                bodyFrame.breakLoop();\n              } else {\n                bodyFrame.continueLoop();\n              }\n            } else {\n              bodyFrame.continueLoop();\n            }\n          });\n        });\n      })\n      .then(() => {\n        if (checkPoints.length > 0) {\n          self.postLayoutBlock(position, checkPoints);\n        }\n        frame.finish(position);\n      });\n    return frame.result();\n  }\n\n  /**\n   * Create a single floating element (for exclusion areas).\n   * @param ref container's child to insert float before (can be null).\n   * @param side float side (\"left\" or \"right\").\n   * @param width float inline dimension.\n   * @param height float box progression dimension.\n   * @return newly created float element.\n   */\n  createFloat(ref: Node, side: string, width: number, height: number): Element {\n    const div = this.viewDocument.createElement(\"div\");\n    if (this.vertical) {\n      if (height >= this.height) {\n        height -= 0.1;\n      }\n      Base.setCSSProperty(div, \"height\", `${width}px`);\n      Base.setCSSProperty(div, \"width\", `${height}px`);\n    } else {\n      if (width >= this.width) {\n        width -= 0.1;\n      }\n      Base.setCSSProperty(div, \"width\", `${width}px`);\n      Base.setCSSProperty(div, \"height\", `${height}px`);\n    }\n    Base.setCSSProperty(div, \"float\", side);\n    Base.setCSSProperty(div, \"clear\", side);\n\n    // enable to visualize\n    // Base.setCSSProperty(div, \"background-color\", \"#50F0FF\");\n    this.element.insertBefore(div, ref);\n    return div;\n  }\n\n  /**\n   * Remove all the exclusion floats.\n   */\n  killFloats(): void {\n    let c: Node = this.element.firstChild;\n    while (c) {\n      const nc = c.nextSibling;\n      if (c.nodeType == 1) {\n        const e = c as HTMLElement;\n        const f = e.style.cssFloat;\n        if (f == \"left\" || f == \"right\") {\n          this.element.removeChild(e);\n        } else {\n          break;\n        }\n      }\n      c = nc;\n    }\n  }\n\n  /**\n   * Create exclusion floats for a column.\n   */\n  createFloats(): void {\n    const ref = this.element.firstChild;\n    const bands = this.bands;\n    const x1 = this.vertical ? this.getTopEdge() : this.getLeftEdge();\n    const x2 = this.vertical ? this.getBottomEdge() : this.getRightEdge();\n    for (const band of bands) {\n      const height = band.y2 - band.y1;\n      band.left = this.createFloat(ref, \"left\", band.x1 - x1, height);\n      band.right = this.createFloat(ref, \"right\", x2 - band.x2, height);\n    }\n  }\n\n  /**\n   * @param nodeContext position after the block\n   * @param checkPoints array of possible breaking points.\n   * @param index index of the breaking point\n   * @param boxOffset box offset\n   * @return edge position\n   */\n  calculateEdge(\n    nodeContext: Vtree.NodeContext,\n    checkPoints: Vtree.NodeContext[],\n    index: number,\n    boxOffset: number,\n  ): number {\n    let edge: number;\n    if (nodeContext && LayoutHelper.isOrphan(nodeContext.viewNode)) {\n      return NaN;\n    } else if (nodeContext && nodeContext.after && !nodeContext.inline) {\n      edge = LayoutHelper.calculateEdge(\n        nodeContext,\n        this.clientLayout,\n        0,\n        this.vertical,\n      );\n      if (!isNaN(edge)) {\n        return edge;\n      }\n    }\n    nodeContext = checkPoints[index];\n    let offset = boxOffset - nodeContext.boxOffset;\n    while (true) {\n      edge = LayoutHelper.calculateEdge(\n        nodeContext,\n        this.clientLayout,\n        offset,\n        this.vertical,\n      );\n      if (!isNaN(edge)) {\n        return edge;\n      }\n      if (offset > 0) {\n        offset--;\n        continue;\n      }\n      index--;\n      if (index < 0) {\n        return this.beforeEdge;\n      }\n      nodeContext = checkPoints[index];\n      if (nodeContext.viewNode.nodeType != 1) {\n        offset = nodeContext.viewNode.textContent.length;\n      }\n    }\n  }\n\n  /**\n   * Parse CSS computed length (in pixels)\n   * @param val CSS length in \"px\" units or a number.\n   * @return value in pixels or 0 if not parsable\n   */\n  parseComputedLength(val: string | number): number {\n    if (typeof val == \"number\") {\n      return val;\n    }\n    const r = val.match(/^(-?[0-9]*(\\.[0-9]*)?)px$/);\n    if (r) {\n      return parseFloat(r[0]);\n    }\n    return 0;\n  }\n\n  /**\n   * Reads element's computed CSS margin.\n   */\n  getComputedMargin(element: Element): GeometryUtil.Insets {\n    const style = this.clientLayout.getElementComputedStyle(element);\n    const insets = new GeometryUtil.Insets(0, 0, 0, 0);\n    if (style) {\n      insets.left = this.parseComputedLength(style.marginLeft);\n      insets.top = this.parseComputedLength(style.marginTop);\n      insets.right = this.parseComputedLength(style.marginRight);\n      insets.bottom = this.parseComputedLength(style.marginBottom);\n    }\n    return insets;\n  }\n\n  /**\n   * Reads element's computed padding + borders.\n   */\n  getComputedPaddingBorder(element: Element): GeometryUtil.Insets {\n    const style = this.clientLayout.getElementComputedStyle(element);\n    const insets = new GeometryUtil.Insets(0, 0, 0, 0);\n    if (style) {\n      insets.left =\n        this.parseComputedLength(style.borderLeftWidth) +\n        this.parseComputedLength(style.paddingLeft);\n      insets.top =\n        this.parseComputedLength(style.borderTopWidth) +\n        this.parseComputedLength(style.paddingTop);\n      insets.right =\n        this.parseComputedLength(style.borderRightWidth) +\n        this.parseComputedLength(style.paddingRight);\n      insets.bottom =\n        this.parseComputedLength(style.borderBottomWidth) +\n        this.parseComputedLength(style.paddingBottom);\n    }\n    return insets;\n  }\n\n  /**\n   * Reads element's computed CSS insets(margins + border + padding or margins :\n   * depends on box-sizing)\n   */\n  getComputedInsets(element: Element): GeometryUtil.Insets {\n    const style = this.clientLayout.getElementComputedStyle(element);\n    const insets = new GeometryUtil.Insets(0, 0, 0, 0);\n    if (style) {\n      if (style.boxSizing == \"border-box\") {\n        return this.getComputedMargin(element);\n      }\n      insets.left =\n        this.parseComputedLength(style.marginLeft) +\n        this.parseComputedLength(style.borderLeftWidth) +\n        this.parseComputedLength(style.paddingLeft);\n      insets.top =\n        this.parseComputedLength(style.marginTop) +\n        this.parseComputedLength(style.borderTopWidth) +\n        this.parseComputedLength(style.paddingTop);\n      insets.right =\n        this.parseComputedLength(style.marginRight) +\n        this.parseComputedLength(style.borderRightWidth) +\n        this.parseComputedLength(style.paddingRight);\n      insets.bottom =\n        this.parseComputedLength(style.marginBottom) +\n        this.parseComputedLength(style.borderBottomWidth) +\n        this.parseComputedLength(style.paddingBottom);\n    }\n    return insets;\n  }\n\n  /**\n   * Set element's computed CSS insets to Column Container\n   */\n  setComputedInsets(element: Element, container: Column) {\n    const style = this.clientLayout.getElementComputedStyle(element);\n    if (style) {\n      container.marginLeft = this.parseComputedLength(style.marginLeft);\n      container.borderLeft = this.parseComputedLength(style.borderLeftWidth);\n      container.paddingLeft = this.parseComputedLength(style.paddingLeft);\n      container.marginTop = this.parseComputedLength(style.marginTop);\n      container.borderTop = this.parseComputedLength(style.borderTopWidth);\n      container.paddingTop = this.parseComputedLength(style.paddingTop);\n      container.marginRight = this.parseComputedLength(style.marginRight);\n      container.borderRight = this.parseComputedLength(style.borderRightWidth);\n      container.paddingRight = this.parseComputedLength(style.paddingRight);\n      container.marginBottom = this.parseComputedLength(style.marginBottom);\n      container.borderBottom = this.parseComputedLength(\n        style.borderBottomWidth,\n      );\n      container.paddingBottom = this.parseComputedLength(style.paddingBottom);\n    }\n  }\n\n  /**\n   * Set element's computed width and height to Column Container\n   */\n  setComputedWidthAndHeight(element: Element, container: Column) {\n    const style = this.clientLayout.getElementComputedStyle(element);\n    if (style) {\n      container.width = this.parseComputedLength(style.width);\n      container.height = this.parseComputedLength(style.height);\n    }\n  }\n\n  /**\n   * Layout a single unbreakable element.\n   */\n  layoutUnbreakable(\n    nodeContextIn: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    return this.buildDeepElementView(nodeContextIn);\n  }\n\n  /**\n   * Layout a single float element.\n   */\n  layoutFloat(nodeContext: Vtree.NodeContext): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"layoutFloat\");\n    const element = nodeContext.viewNode as Element;\n    const floatSide = nodeContext.floatSide as string;\n    Base.setCSSProperty(element, \"float\", \"none\");\n    Base.setCSSProperty(element, \"display\", \"inline-block\");\n    Base.setCSSProperty(element, \"vertical-align\", \"top\");\n    self.buildDeepElementView(nodeContext).then((nodeContextAfter) => {\n      const floatBBox = self.clientLayout.getElementClientRect(element);\n      const margin = self.getComputedMargin(element);\n      let floatBox = new GeometryUtil.Rect(\n        floatBBox.left - margin.left,\n        floatBBox.top - margin.top,\n        floatBBox.right + margin.right,\n        floatBBox.bottom + margin.bottom,\n      );\n      let x1 = self.startEdge;\n      let x2 = self.endEdge;\n      let parent = nodeContext.parent;\n      while (parent && parent.inline) {\n        parent = parent.parent;\n      }\n      if (parent) {\n        // Position it at the parent element's edge.\n        // We need to get the edge of the parent's content area, calling\n        // getElementClientRect will also give us borders. Avoid it by creating\n        // a temporary element and using it for measurment.\n        const probe = parent.viewNode.ownerDocument.createElement(\"div\");\n        probe.style.left = \"0px\";\n        probe.style.top = \"0px\";\n        if (self.vertical) {\n          probe.style.bottom = \"0px\";\n          probe.style.width = \"1px\";\n        } else {\n          probe.style.right = \"0px\";\n          probe.style.height = \"1px\";\n        }\n        parent.viewNode.appendChild(probe);\n        const parentBox = self.clientLayout.getElementClientRect(probe);\n        x1 = Math.max(self.getStartEdge(parentBox), x1);\n        x2 = Math.min(self.getEndEdge(parentBox), x2);\n        parent.viewNode.removeChild(probe);\n        const floatBoxMeasure = self.vertical\n          ? floatBox.y2 - floatBox.y1\n          : floatBox.x2 - floatBox.x1;\n        if (floatSide == \"left\") {\n          x2 = Math.max(x2, x1 + floatBoxMeasure);\n        } else {\n          x1 = Math.min(x1, x2 - floatBoxMeasure);\n        }\n\n        // Move the float below the block parent.\n        // Otherwise, if the float is attached to an inline box with 'position:\n        // relative', the absolute positioning of the float gets broken, since\n        // the inline parent can be pushed horizontally by exclusion floats\n        // after the layout of the float is done.\n        parent.viewNode.appendChild(nodeContext.viewNode);\n      }\n\n      // box is rotated for vertical orientation\n      let box = new GeometryUtil.Rect(\n        x1,\n        self.getBoxDir() * self.beforeEdge,\n        x2,\n        self.getBoxDir() * self.afterEdge,\n      );\n      let floatHorBox = floatBox;\n      if (self.vertical) {\n        floatHorBox = GeometryUtil.rotateBox(floatBox);\n      }\n      const dir = self.getBoxDir();\n      if (floatHorBox.y1 < self.bottommostFloatTop * dir) {\n        const boxExtent = floatHorBox.y2 - floatHorBox.y1;\n        floatHorBox.y1 = self.bottommostFloatTop * dir;\n        floatHorBox.y2 = floatHorBox.y1 + boxExtent;\n      }\n      GeometryUtil.positionFloat(box, self.bands, floatHorBox, floatSide);\n      if (self.vertical) {\n        floatBox = GeometryUtil.unrotateBox(floatHorBox);\n      }\n      const insets = self.getComputedInsets(element);\n      Base.setCSSProperty(\n        element,\n        \"width\",\n        `${floatBox.x2 - floatBox.x1 - insets.left - insets.right}px`,\n      );\n      Base.setCSSProperty(\n        element,\n        \"height\",\n        `${floatBox.y2 - floatBox.y1 - insets.top - insets.bottom}px`,\n      );\n      Base.setCSSProperty(element, \"position\", \"absolute\");\n      Asserts.assert(nodeContext.display);\n      Base.setCSSProperty(element, \"display\", nodeContext.display);\n      let offsets;\n      let containingBlockForAbsolute: Vtree.NodeContext = null;\n      if (parent) {\n        if (parent.containingBlockForAbsolute) {\n          containingBlockForAbsolute = parent;\n        } else {\n          containingBlockForAbsolute = parent.getContainingBlockForAbsolute();\n        }\n      }\n      if (containingBlockForAbsolute) {\n        const probe = containingBlockForAbsolute.viewNode.ownerDocument.createElement(\n          \"div\",\n        );\n        probe.style.position = \"absolute\";\n        if (containingBlockForAbsolute.vertical) {\n          probe.style.right = \"0\";\n        } else {\n          probe.style.left = \"0\";\n        }\n        probe.style.top = \"0\";\n        containingBlockForAbsolute.viewNode.appendChild(probe);\n        offsets = self.clientLayout.getElementClientRect(probe);\n        containingBlockForAbsolute.viewNode.removeChild(probe);\n      } else {\n        offsets = {\n          left: self.getLeftEdge() - self.paddingLeft,\n          right: self.getRightEdge() + self.paddingRight,\n          top: self.getTopEdge() - self.paddingTop,\n        };\n      }\n      if (\n        containingBlockForAbsolute\n          ? containingBlockForAbsolute.vertical\n          : self.vertical\n      ) {\n        Base.setCSSProperty(\n          element,\n          \"right\",\n          `${offsets.right - floatBox.x2}px`,\n        );\n      } else {\n        Base.setCSSProperty(element, \"left\", `${floatBox.x1 - offsets.left}px`);\n      }\n      Base.setCSSProperty(element, \"top\", `${floatBox.y1 - offsets.top}px`);\n      if (nodeContext.clearSpacer) {\n        nodeContext.clearSpacer.parentNode.removeChild(nodeContext.clearSpacer);\n        nodeContext.clearSpacer = null;\n      }\n      const floatBoxEdge = self.vertical ? floatBox.x1 : floatBox.y2;\n      const floatBoxTop = self.vertical ? floatBox.x2 : floatBox.y1;\n\n      // TODO: subtract after margin when determining overflow.\n      if (!self.isOverflown(floatBoxEdge) || self.breakPositions.length == 0) {\n        // no overflow\n        self.killFloats();\n        box = new GeometryUtil.Rect(\n          self.getLeftEdge(),\n          self.getTopEdge(),\n          self.getRightEdge(),\n          self.getBottomEdge(),\n        );\n        if (self.vertical) {\n          box = GeometryUtil.rotateBox(box);\n        }\n        GeometryUtil.addFloatToBands(\n          box,\n          self.bands,\n          floatHorBox,\n          null,\n          floatSide,\n        );\n        self.createFloats();\n        if (floatSide == \"left\") {\n          self.leftFloatEdge = floatBoxEdge;\n        } else {\n          self.rightFloatEdge = floatBoxEdge;\n        }\n        self.bottommostFloatTop = floatBoxTop;\n        self.updateMaxReachedAfterEdge(floatBoxEdge);\n        frame.finish(nodeContextAfter);\n      } else {\n        nodeContext = nodeContext.modify();\n        nodeContext.overflow = true;\n        frame.finish(nodeContext);\n      }\n    });\n    return frame.result();\n  }\n\n  setupFloatArea(\n    area: PageFloatArea,\n    floatReference: PageFloats.FloatReference,\n    floatSide: string,\n    anchorEdge: number | null,\n    strategy: PageFloats.PageFloatLayoutStrategy,\n    condition: PageFloats.PageFloatPlacementCondition,\n  ): boolean {\n    const floatLayoutContext = this.pageFloatLayoutContext;\n    const floatContainer = floatLayoutContext.getContainer(floatReference);\n    const element = area.element;\n    floatContainer.element.parentNode.appendChild(element);\n    area.isFloat = true;\n    area.originX = floatContainer.originX;\n    area.originY = floatContainer.originY;\n    area.vertical = floatContainer.vertical;\n    area.marginLeft = area.marginRight = area.marginTop = area.marginBottom = 0;\n    area.borderLeft = area.borderRight = area.borderTop = area.borderBottom = 0;\n    area.paddingLeft = area.paddingRight = area.paddingTop = area.paddingBottom = 0;\n    area.exclusions = (floatContainer.exclusions || []).concat();\n    area.forceNonfitting = !floatLayoutContext.hasFloatFragments();\n    area.innerShape = null;\n    const containingBlockRect = floatContainer.getPaddingRect();\n    area.setHorizontalPosition(\n      containingBlockRect.x1 - floatContainer.originX,\n      containingBlockRect.x2 - containingBlockRect.x1,\n    );\n    area.setVerticalPosition(\n      containingBlockRect.y1 - floatContainer.originY,\n      containingBlockRect.y2 - containingBlockRect.y1,\n    );\n    strategy.adjustPageFloatArea(area, floatContainer, this);\n\n    // Calculate bands from the exclusions before setting float area dimensions\n    area.init();\n    const fitWithinContainer = !!floatLayoutContext.setFloatAreaDimensions(\n      area,\n      floatReference,\n      floatSide,\n      anchorEdge,\n      true,\n      !floatLayoutContext.hasFloatFragments(),\n      condition,\n    );\n    if (fitWithinContainer) {\n      // New dimensions have been set, remove exclusion floats and re-init\n      area.killFloats();\n      area.init();\n    } else {\n      floatContainer.element.parentNode.removeChild(element);\n    }\n    return fitWithinContainer;\n  }\n\n  createPageFloatArea(\n    float: PageFloats.PageFloat | null,\n    floatSide: string,\n    anchorEdge: number | null,\n    strategy: PageFloats.PageFloatLayoutStrategy,\n    condition: PageFloats.PageFloatPlacementCondition,\n  ): PageFloatArea | null {\n    const floatAreaElement = this.element.ownerDocument.createElement(\"div\");\n    Base.setCSSProperty(floatAreaElement, \"position\", \"absolute\");\n    const parentPageFloatLayoutContext = this.pageFloatLayoutContext.getPageFloatLayoutContext(\n      float.floatReference,\n    );\n\n    // TODO: establish how to specify an appropriate generating element for the\n    // new page float layout context\n    const pageFloatLayoutContext = new PageFloats.PageFloatLayoutContext(\n      null,\n      PageFloats.FloatReference.COLUMN,\n      null,\n      this.pageFloatLayoutContext.flowName,\n      float.nodePosition,\n      null,\n      null,\n    );\n    const parentContainer = parentPageFloatLayoutContext.getContainer();\n    const floatArea = new PageFloatArea(\n      floatSide,\n      floatAreaElement,\n      this.layoutContext.clone(),\n      this.clientLayout,\n      this.layoutConstraint,\n      pageFloatLayoutContext,\n      parentContainer,\n    );\n    pageFloatLayoutContext.setContainer(floatArea);\n    if (\n      this.setupFloatArea(\n        floatArea,\n        float.floatReference,\n        floatSide,\n        anchorEdge,\n        strategy,\n        condition,\n      )\n    ) {\n      return floatArea;\n    } else {\n      return null;\n    }\n  }\n\n  layoutSinglePageFloatFragment(\n    continuations: PageFloats.PageFloatContinuation[],\n    floatSide: string,\n    clearSide: string | null,\n    allowFragmented: boolean,\n    strategy: PageFloats.PageFloatLayoutStrategy,\n    anchorEdge: number | null,\n    pageFloatFragment?: PageFloats.PageFloatFragment | null,\n  ): Task.Result<SinglePageFloatLayoutResult> {\n    const context = this.pageFloatLayoutContext;\n    const originalContinuations = pageFloatFragment\n      ? pageFloatFragment.continuations\n      : [];\n    continuations = originalContinuations.concat(continuations);\n    const firstFloat = continuations[0].float;\n    const condition = context.getPageFloatPlacementCondition(\n      firstFloat,\n      floatSide,\n      clearSide,\n    );\n    const floatArea = this.createPageFloatArea(\n      firstFloat,\n      floatSide,\n      anchorEdge,\n      strategy,\n      condition,\n    );\n    const result: SinglePageFloatLayoutResult = {\n      floatArea,\n      pageFloatFragment: null,\n      newPosition: null,\n    };\n    if (!floatArea) {\n      return Task.newResult(result);\n    }\n    const frame = Task.newFrame<SinglePageFloatLayoutResult>(\n      \"layoutSinglePageFloatFragment\",\n    );\n    let failed = false;\n    let i = 0;\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (i >= continuations.length) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const c = continuations[i];\n        const floatChunkPosition = new VtreeImpl.ChunkPosition(c.nodePosition);\n        floatArea.layout(floatChunkPosition, true).then((newPosition) => {\n          result.newPosition = newPosition;\n          if (!newPosition || allowFragmented) {\n            i++;\n            loopFrame.continueLoop();\n          } else {\n            failed = true;\n            loopFrame.breakLoop();\n          }\n        });\n      })\n      .then(() => {\n        if (!failed) {\n          Asserts.assert(floatArea);\n          const logicalFloatSide = context.setFloatAreaDimensions(\n            floatArea,\n            firstFloat.floatReference,\n            floatSide,\n            anchorEdge,\n            false,\n            allowFragmented,\n            condition,\n          );\n          if (!logicalFloatSide) {\n            failed = true;\n          } else {\n            const newFragment = strategy.createPageFloatFragment(\n              continuations,\n              logicalFloatSide,\n              floatArea,\n              !!result.newPosition,\n            );\n            context.addPageFloatFragment(newFragment, true);\n            result.pageFloatFragment = newFragment;\n          }\n        }\n        frame.finish(result);\n      });\n    return frame.result();\n  }\n\n  layoutPageFloatInner(\n    continuation: PageFloats.PageFloatContinuation,\n    strategy: PageFloats.PageFloatLayoutStrategy,\n    anchorEdge: number | null,\n    pageFloatFragment?: PageFloats.PageFloatFragment,\n  ): Task.Result<boolean> {\n    const context = this.pageFloatLayoutContext;\n    const float = continuation.float;\n    context.stashEndFloatFragments(float);\n\n    function cancelLayout(floatArea, pageFloatFragment) {\n      if (pageFloatFragment) {\n        context.removePageFloatFragment(pageFloatFragment, true);\n      } else if (floatArea) {\n        floatArea.element.parentNode.removeChild(floatArea.element);\n      }\n      context.restoreStashedFragments(float.floatReference);\n      context.deferPageFloat(continuation);\n    }\n    const frame: Task.Frame<boolean> = Task.newFrame(\"layoutPageFloatInner\");\n    const self = this;\n    this.layoutSinglePageFloatFragment(\n      [continuation],\n      float.floatSide,\n      float.clearSide,\n      !context.hasFloatFragments(),\n      strategy,\n      anchorEdge,\n      pageFloatFragment,\n    ).then((result) => {\n      const floatArea = result.floatArea;\n      const newFragment = result.pageFloatFragment;\n      const newPosition = result.newPosition;\n      if (newFragment) {\n        self\n          .layoutStashedPageFloats(float.floatReference, [pageFloatFragment])\n          .then((success) => {\n            if (success) {\n              // Add again to invalidate the context\n              Asserts.assert(newFragment);\n              context.addPageFloatFragment(newFragment);\n              context.discardStashedFragments(float.floatReference);\n              if (newPosition) {\n                const continuation = new PageFloats.PageFloatContinuation(\n                  float,\n                  newPosition.primary,\n                );\n                context.deferPageFloat(continuation);\n              }\n              frame.finish(true);\n            } else {\n              cancelLayout(floatArea, newFragment);\n              frame.finish(false);\n            }\n          });\n      } else {\n        cancelLayout(floatArea, newFragment);\n        frame.finish(false);\n      }\n    });\n    return frame.result();\n  }\n\n  /**\n   * @returns Represents if the layout was succeeded or not\n   */\n  private layoutStashedPageFloats(\n    floatReference: PageFloats.FloatReference,\n    excluded: PageFloats.PageFloatFragment[],\n  ): Task.Result<boolean> {\n    const context = this.pageFloatLayoutContext;\n    const stashedFloatFragments = context.getStashedFloatFragments(\n      floatReference,\n    );\n    const newFloatAreas = [];\n    const newFragments = [];\n    let failed = false;\n    const frame = Task.newFrame<boolean>(\"layoutStashedPageFloats\");\n    const self = this;\n    let i = 0;\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (i >= stashedFloatFragments.length) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const stashedFragment = stashedFloatFragments[i];\n        if (excluded.includes(stashedFragment)) {\n          i++;\n          loopFrame.continueLoop();\n          return;\n        }\n        const strategy = new PageFloats.PageFloatLayoutStrategyResolver().findByFloat(\n          stashedFragment.continuations[0].float,\n        );\n\n        // Value of 'clear' is irrelevant when laying out stashed floats\n        // since whether the 'clear' value allows placing the float\n        // here is already resolved.\n        self\n          .layoutSinglePageFloatFragment(\n            stashedFragment.continuations,\n            stashedFragment.floatSide,\n            null,\n            false,\n            strategy,\n            null,\n          )\n          .then((result) => {\n            const floatArea = result.floatArea;\n            if (floatArea) {\n              newFloatAreas.push(floatArea);\n            }\n            const fragment = result.pageFloatFragment;\n            if (fragment) {\n              newFragments.push(fragment);\n              i++;\n              loopFrame.continueLoop();\n            } else {\n              failed = true;\n              loopFrame.breakLoop();\n            }\n          });\n      })\n      .then(() => {\n        if (failed) {\n          newFragments.forEach((fragment) => {\n            context.removePageFloatFragment(fragment, true);\n          });\n          newFloatAreas.forEach((area) => {\n            const elem = area.element;\n            if (elem && elem.parentNode) {\n              elem.parentNode.removeChild(elem);\n            }\n          });\n        } else {\n          stashedFloatFragments.forEach((fragment) => {\n            const elem = fragment.area.element;\n            if (elem && elem.parentNode) {\n              elem.parentNode.removeChild(elem);\n            }\n          });\n        }\n        frame.finish(!failed);\n      });\n    return frame.result();\n  }\n\n  setFloatAnchorViewNode(nodeContext: Vtree.NodeContext): Vtree.NodeContext {\n    const parent = nodeContext.viewNode.parentNode;\n    const anchor = parent.ownerDocument.createElement(\"span\");\n    anchor.setAttribute(VtreeImpl.SPECIAL_ATTR, \"1\");\n    if (nodeContext.floatSide === \"footnote\") {\n      // Defaults for footnote-call, can be overriden by the stylesheet.\n      this.layoutContext.applyPseudoelementStyle(\n        nodeContext,\n        \"footnote-call\",\n        anchor,\n      );\n    }\n    parent.appendChild(anchor);\n    parent.removeChild(nodeContext.viewNode);\n    const nodeContextAfter = nodeContext.modify();\n    nodeContextAfter.after = true;\n    nodeContextAfter.viewNode = anchor;\n    return nodeContextAfter;\n  }\n\n  resolveFloatReferenceFromColumnSpan(\n    floatReference: PageFloats.FloatReference,\n    columnSpan: Css.Val,\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<PageFloats.FloatReference> {\n    const self = this;\n    const frame = Task.newFrame(\n      \"resolveFloatReferenceFromColumnSpan\",\n    ) as Task.Frame<PageFloats.FloatReference>;\n    const columnContext = this.pageFloatLayoutContext;\n    const regionContext = columnContext.getPageFloatLayoutContext(\n      PageFloats.FloatReference.REGION,\n    );\n    const isRegionWider =\n      columnContext.getContainer().width < regionContext.getContainer().width;\n    if (isRegionWider && floatReference === PageFloats.FloatReference.COLUMN) {\n      if (columnSpan === Css.ident.auto) {\n        this.buildDeepElementView(nodeContext.copy()).then((position) => {\n          const element = position.viewNode as Element;\n          let inlineSize = Sizing.getSize(self.clientLayout, element, [\n            Sizing.Size.MIN_CONTENT_INLINE_SIZE,\n          ])[Sizing.Size.MIN_CONTENT_INLINE_SIZE];\n          const margin = self.getComputedMargin(element);\n          if (self.vertical) {\n            inlineSize += margin.top + margin.bottom;\n          } else {\n            inlineSize += margin.left + margin.right;\n          }\n          if (inlineSize > self.width) {\n            frame.finish(PageFloats.FloatReference.REGION);\n          } else {\n            frame.finish(floatReference);\n          }\n        });\n      } else if (columnSpan === Css.ident.all) {\n        frame.finish(PageFloats.FloatReference.REGION);\n      } else {\n        frame.finish(floatReference);\n      }\n    } else {\n      frame.finish(floatReference);\n    }\n    return frame.result();\n  }\n\n  layoutPageFloat(\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const context = this.pageFloatLayoutContext;\n    const strategy = new PageFloats.PageFloatLayoutStrategyResolver().findByNodeContext(\n      nodeContext,\n    );\n    let cont: Task.Result<PageFloats.PageFloat>;\n    const float = context.findPageFloatByNodePosition(\n      nodeContext.toNodePosition(),\n    );\n    if (!float) {\n      cont = strategy.createPageFloat(nodeContext, context, this);\n    } else {\n      cont = Task.newResult(float);\n    }\n    return cont.thenAsync((float) => {\n      const nodePosition = VtreeImpl.newNodePositionFromNodeContext(\n        nodeContext,\n        0,\n      );\n      const nodeContextAfter = self.setFloatAnchorViewNode(nodeContext);\n      const pageFloatFragment = strategy.findPageFloatFragment(float, context);\n      const continuation = new PageFloats.PageFloatContinuation(\n        float,\n        nodePosition,\n      );\n      if (pageFloatFragment && pageFloatFragment.hasFloat(float)) {\n        context.registerPageFloatAnchor(float, nodeContextAfter.viewNode);\n        return Task.newResult(nodeContextAfter as Vtree.NodeContext);\n      } else if (\n        context.isForbidden(float) ||\n        context.hasPrecedingFloatsDeferredToNext(float)\n      ) {\n        context.deferPageFloat(continuation);\n        context.registerPageFloatAnchor(float, nodeContextAfter.viewNode);\n        return Task.newResult(nodeContextAfter as Vtree.NodeContext);\n      } else if (self.nodeContextOverflowingDueToRepetitiveElements) {\n        return Task.newResult(null);\n      } else {\n        const edge = LayoutHelper.calculateEdge(\n          nodeContextAfter,\n          self.clientLayout,\n          0,\n          self.vertical,\n        );\n        if (self.isOverflown(edge)) {\n          return Task.newResult(nodeContextAfter);\n        } else {\n          return self\n            .layoutPageFloatInner(\n              continuation,\n              strategy,\n              edge,\n              pageFloatFragment,\n            )\n            .thenAsync((success) => {\n              Asserts.assert(float);\n              if (!success) {\n                context.registerPageFloatAnchor(\n                  float,\n                  nodeContextAfter.viewNode,\n                );\n                return Task.newResult(nodeContextAfter);\n              } else {\n                return Task.newResult(null);\n              }\n            });\n        }\n      }\n    });\n  }\n\n  createJustificationAdjustmentElement(\n    insertionPoint: Node,\n    doc: Document,\n    parentNode: Node,\n    vertical: boolean,\n  ): HTMLElement {\n    const span = doc.createElement(\"span\") as HTMLElement;\n    span.style.visibility = \"hidden\";\n    span.style.verticalAlign = \"top\";\n    span.setAttribute(VtreeImpl.SPECIAL_ATTR, \"1\");\n    const inner = doc.createElement(\"span\") as HTMLElement;\n    inner.style.fontSize = \"0\";\n    inner.style.lineHeight = \"0\";\n    inner.textContent = \" #\";\n    span.appendChild(inner);\n\n    // Measure inline-start and inline-end edge positions of the line box,\n    // taking (exclusion) floats into consideration\n    span.style.display = \"block\";\n    span.style.textIndent = \"0\";\n    span.style.textAlign = \"left\";\n    parentNode.insertBefore(span, insertionPoint);\n    const leftPos = this.clientLayout.getElementClientRect(inner);\n    span.style.textAlign = \"right\";\n    const rightPos = this.clientLayout.getElementClientRect(inner);\n    span.style.textAlign = \"\";\n    if (Base.checkInlineBlockJustificationBug(document.body)) {\n      // For Chrome\n      span.style.display = \"inline\";\n    } else {\n      // For Firefox, Edge and IE\n      span.style.display = \"inline-block\";\n    }\n    const padding = vertical\n      ? rightPos.top - leftPos.top\n      : rightPos.left - leftPos.left;\n    const paddingStr = padding >= 1 ? `${padding - 1}px` : \"100%\";\n    if (vertical) {\n      span.style.paddingTop = paddingStr;\n    } else {\n      span.style.paddingLeft = paddingStr;\n    }\n    return span;\n  }\n\n  addAndAdjustJustificationElement(\n    nodeContext: Vtree.NodeContext,\n    insertAfter: boolean,\n    node: Node,\n    insertionPoint: Node,\n    doc: Document,\n    parentNode: Node,\n  ): HTMLElement {\n    fixJustificationOnHyphen(nodeContext, insertAfter, node, insertionPoint);\n    return this.createJustificationAdjustmentElement(\n      insertionPoint,\n      doc,\n      parentNode,\n      nodeContext.vertical,\n    );\n  }\n\n  compensateJustificationLineHeight(\n    span: Element,\n    br: Element,\n    nodeContext: Vtree.NodeContext,\n  ) {\n    const spanRect = this.clientLayout.getElementClientRect(span);\n    const brRect = this.clientLayout.getElementClientRect(br);\n    if (nodeContext.vertical) {\n      (br as HTMLElement).style.marginRight = `${brRect.right -\n        spanRect.right}px`;\n      (br as HTMLElement).style.width = \"0px\";\n    } else {\n      (br as HTMLElement).style.marginTop = `${spanRect.top - brRect.top}px`;\n      (br as HTMLElement).style.height = \"0px\";\n    }\n    br.setAttribute(VtreeImpl.SPECIAL_ATTR, \"1\");\n  }\n\n  /**\n   * Fix justification of the last line of text broken across pages (if\n   * needed).\n   */\n  fixJustificationIfNeeded(\n    nodeContext: Vtree.NodeContext,\n    endOfColumn: boolean,\n  ): void {\n    if (nodeContext.after && !nodeContext.inline) {\n      return;\n    }\n    if (endOfColumn) {\n      let textAlign = \"\";\n      for (\n        let parent = nodeContext.parent;\n        parent && !textAlign;\n        parent = parent.parent\n      ) {\n        if (!parent.inline && parent.viewNode) {\n          textAlign = (parent.viewNode as HTMLElement).style.textAlign;\n        }\n      }\n      if (textAlign !== \"justify\") {\n        return;\n      }\n    }\n    const node = nodeContext.viewNode;\n    const doc = node.ownerDocument;\n    const insertAfter =\n      endOfColumn && (nodeContext.after || node.nodeType != 1);\n    let insertionPoint = insertAfter ? node.nextSibling : node;\n    if (insertionPoint && !insertionPoint.parentNode) {\n      // Possible if removeSelf = false in finishBreak()\n      insertionPoint = null;\n    }\n    const parentNode =\n      node.parentNode || (nodeContext.parent && nodeContext.parent.viewNode);\n    if (!parentNode) {\n      // Possible if nothing was added to the column\n      return;\n    }\n    const span = this.addAndAdjustJustificationElement(\n      nodeContext,\n      insertAfter,\n      node,\n      insertionPoint,\n      doc,\n      parentNode,\n    );\n    if (!endOfColumn) {\n      const br = doc.createElement(\"div\") as HTMLElement;\n      parentNode.insertBefore(br, insertionPoint);\n      this.compensateJustificationLineHeight(span, br, nodeContext);\n    }\n  }\n\n  processLineStyling(\n    nodeContext: Vtree.NodeContext,\n    resNodeContext: Vtree.NodeContext,\n    checkPoints: Vtree.NodeContext[],\n  ): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"processLineStyling\",\n    );\n    if (VIVLIOSTYLE_DEBUG) {\n      validateCheckPoints(checkPoints);\n    }\n    let lastCheckPoints = checkPoints.concat([]); // make a copy\n    checkPoints.splice(0, checkPoints.length); // make empty\n    let totalLineCount = 0;\n    let firstPseudo = nodeContext.firstPseudo; // :first-letter is not processed here\n    if (firstPseudo.count == 0) {\n      firstPseudo = firstPseudo.outer; // move to line pseudoelement (if any)\n    }\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (!firstPseudo) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const linePositions = self.findLinePositions(lastCheckPoints);\n        const count = firstPseudo.count - totalLineCount;\n        if (linePositions.length <= count) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const lineBreak = self.findAcceptableBreakInside(\n          lastCheckPoints,\n          linePositions[count - 1],\n          true,\n        );\n        if (lineBreak == null) {\n          loopFrame.breakLoop();\n          return;\n        }\n        self.finishBreak(lineBreak, false, false).then(() => {\n          totalLineCount += count;\n          self.layoutContext\n            .peelOff(lineBreak, 0)\n            .then((resNodeContextParam) => {\n              nodeContext = resNodeContextParam;\n              self.fixJustificationIfNeeded(nodeContext, false);\n              firstPseudo = nodeContext.firstPseudo;\n              lastCheckPoints = []; // Wipe out line breaks inside pseudoelements\n              self\n                .buildViewToNextBlockEdge(nodeContext, lastCheckPoints)\n                .then((resNodeContextParam) => {\n                  resNodeContext = resNodeContextParam;\n                  loopFrame.continueLoop();\n                });\n            });\n        });\n      })\n      .then(() => {\n        Array.prototype.push.apply(checkPoints, lastCheckPoints);\n        if (VIVLIOSTYLE_DEBUG) {\n          validateCheckPoints(checkPoints);\n        }\n        frame.finish(resNodeContext);\n      });\n    return frame.result();\n  }\n\n  isLoneImage(checkPoints: Vtree.NodeContext[]): boolean {\n    if (checkPoints.length != 2 && this.breakPositions.length > 0) {\n      return false;\n    }\n    return (\n      checkPoints[0].sourceNode == checkPoints[1].sourceNode &&\n      mediaTags[(checkPoints[0].sourceNode as Element).localName]\n    );\n  }\n\n  getTrailingMarginEdgeAdjustment(\n    trailingEdgeContexts: Vtree.NodeContext[],\n  ): number {\n    // Margins push the computed height, but are not counted as overflow. We\n    // need to find the overall collapsed margin from all enclosed blocks.\n    let maxPos = 0;\n    let minNeg = 0;\n    for (let i = trailingEdgeContexts.length - 1; i >= 0; i--) {\n      const nodeContext = trailingEdgeContexts[i];\n      if (\n        !nodeContext.after ||\n        !nodeContext.viewNode ||\n        nodeContext.viewNode.nodeType != 1\n      ) {\n        break;\n      }\n      const margin = this.getComputedMargin(nodeContext.viewNode as Element);\n      const m = this.vertical ? -margin.left : margin.bottom;\n      if (m > 0) {\n        maxPos = Math.max(maxPos, m);\n      } else {\n        minNeg = Math.min(minNeg, m);\n      }\n    }\n    return maxPos - minNeg;\n  }\n\n  /**\n   * Layout a single CSS box.\n   */\n  layoutBreakableBlock(\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"layoutBreakableBlock\",\n    );\n    const checkPoints: Vtree.NodeContext[] = [];\n    self\n      .buildViewToNextBlockEdge(nodeContext, checkPoints)\n      .then((resNodeContext) => {\n        // at this point a single block was appended to the column\n        // flowPosition is either null or\n        //  - if !after: contains view for the next block element\n        //  - if after: contains view for the enclosing block element\n        const checkPointIndex = checkPoints.length - 1;\n        if (checkPointIndex < 0) {\n          frame.finish(resNodeContext);\n          return;\n        }\n\n        // Record the height\n        // TODO: should this be done after first-line calculation?\n        let edge = self.calculateEdge(\n          resNodeContext,\n          checkPoints,\n          checkPointIndex,\n          checkPoints[checkPointIndex].boxOffset,\n        );\n        let overflown = false;\n        if (\n          !resNodeContext ||\n          !LayoutHelper.isOrphan(resNodeContext.viewNode)\n        ) {\n          const offsets = BreakPosition.calculateOffset(\n            resNodeContext,\n            self.collectElementsOffset(),\n          );\n          overflown = self.isOverflown(\n            edge + (self.vertical ? -1 : 1) * offsets.minimum,\n          );\n          if (\n            self.isOverflown(\n              edge + (self.vertical ? -1 : 1) * offsets.current,\n            ) &&\n            !self.nodeContextOverflowingDueToRepetitiveElements\n          ) {\n            self.nodeContextOverflowingDueToRepetitiveElements = resNodeContext;\n          }\n        }\n        if (resNodeContext == null) {\n          edge += self.getTrailingMarginEdgeAdjustment(checkPoints);\n        }\n        self.updateMaxReachedAfterEdge(edge);\n        let lineCont: Task.Result<Vtree.NodeContext>;\n        if (nodeContext.firstPseudo) {\n          // possibly need to deal with :first-line and friends\n          lineCont = self.processLineStyling(\n            nodeContext,\n            resNodeContext,\n            checkPoints,\n          );\n        } else {\n          lineCont = Task.newResult(resNodeContext);\n        }\n        lineCont.then((nodeContext) => {\n          self.postLayoutBlock(nodeContext, checkPoints);\n          if (checkPoints.length > 0) {\n            self.saveBoxBreakPosition(checkPoints);\n\n            // TODO: how to signal overflow in the last pagargaph???\n            if (overflown && !self.isLoneImage(checkPoints) && nodeContext) {\n              nodeContext = nodeContext.modify();\n              nodeContext.overflow = true;\n            }\n          }\n          frame.finish(nodeContext);\n        });\n      });\n    return frame.result();\n  }\n\n  postLayoutBlock(\n    nodeContext: Vtree.NodeContext,\n    checkPoints: Vtree.NodeContext[],\n  ) {\n    const hooks: Plugin.PostLayoutBlockHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.POST_LAYOUT_BLOCK,\n    );\n    hooks.forEach((hook) => {\n      hook(nodeContext, checkPoints, this);\n    });\n  }\n\n  findEndOfLine(\n    linePosition: number,\n    checkPoints: Vtree.NodeContext[],\n    isUpdateMaxReachedAfterEdge: boolean,\n  ): {\n    nodeContext: Vtree.NodeContext;\n    index: number;\n    checkPointIndex: number;\n  } {\n    if (VIVLIOSTYLE_DEBUG) {\n      validateCheckPoints(checkPoints);\n    }\n\n    // Workaround for Blink not returning correct fractional values for\n    // Range.getClientRects.\n    // https://bugs.chromium.org/p/chromium/issues/detail?id=629828\n    const effectiveLinePosition = this.vertical\n      ? linePosition - 1\n      : linePosition + 1;\n\n    // find the first character which is out\n    let lowCP = 0;\n    let low = checkPoints[0].boxOffset;\n    let low1 = lowCP;\n    let highCP = checkPoints.length - 1;\n    let high = checkPoints[highCP].boxOffset;\n    let mid: number;\n    while (low < high) {\n      mid = low + Math.ceil((high - low) / 2);\n\n      // find the node which contains mid index\n      low1 = lowCP;\n      let high1 = highCP;\n      while (low1 < high1) {\n        const mid1 = low1 + Math.ceil((high1 - low1) / 2);\n        if (checkPoints[mid1].boxOffset > mid) {\n          high1 = mid1 - 1;\n        } else {\n          low1 = mid1;\n        }\n      }\n      const edge = this.calculateEdge(null, checkPoints, low1, mid);\n      if (\n        this.vertical\n          ? edge <= effectiveLinePosition\n          : edge >= effectiveLinePosition\n      ) {\n        high = mid - 1;\n        while (checkPoints[low1].boxOffset == mid) {\n          low1--;\n        }\n        highCP = low1;\n      } else {\n        if (isUpdateMaxReachedAfterEdge) {\n          this.updateMaxReachedAfterEdge(edge);\n        }\n        low = mid;\n        lowCP = low1;\n      }\n    }\n    return {\n      nodeContext: checkPoints[low1],\n      index: low,\n      checkPointIndex: low1,\n    };\n  }\n\n  findAcceptableBreakInside(\n    checkPoints: Vtree.NodeContext[],\n    edgePosition: number,\n    force: boolean,\n  ): Vtree.NodeContext {\n    const position = this.findEndOfLine(edgePosition, checkPoints, true);\n    let nodeContext = position.nodeContext;\n    const viewNode = nodeContext.viewNode;\n    if (viewNode.nodeType != 1) {\n      const textNode = viewNode as Text;\n      const textNodeBreaker = this.resolveTextNodeBreaker(nodeContext);\n      nodeContext = textNodeBreaker.breakTextNode(\n        textNode,\n        nodeContext,\n        position.index,\n        checkPoints,\n        position.checkPointIndex,\n        force,\n      );\n    }\n    this.clearOverflownViewNodes(nodeContext, false);\n    return nodeContext;\n  }\n\n  resolveTextNodeBreaker(nodeContext: Vtree.NodeContext): TextNodeBreaker {\n    const hooks: Plugin.ResolveTextNodeBreakerHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.RESOLVE_TEXT_NODE_BREAKER,\n    );\n    return hooks.reduce(\n      (prev, hook) => hook(nodeContext) || prev,\n      TextNodeBreaker.instance,\n    );\n  }\n\n  /**\n   * Read ranges skipping special elments\n   */\n  getRangeBoxes(start: Node, end: Node): Vtree.ClientRect[] {\n    const arr = [];\n    const range = start.ownerDocument.createRange();\n    let wentUp = false;\n    let node = start;\n    let lastGood: Node = null;\n    let haveStart = false;\n    let endNotReached = true;\n    while (endNotReached) {\n      let seekRange = true;\n      do {\n        let next: Node = null;\n        if (node == end) {\n          if (end.nodeType === 1) {\n            // If end is an element, continue traversing its children to find\n            // the last text node inside it. Finish when end has no child or\n            // when came back from its children (wentUp==true).\n            endNotReached = !(!end.firstChild || wentUp);\n          } else {\n            endNotReached = false;\n          }\n        }\n        if (node.nodeType != 1) {\n          if (!haveStart) {\n            range.setStartBefore(node);\n            haveStart = true;\n          }\n          lastGood = node;\n        } else if (wentUp) {\n          wentUp = false;\n        } else if (LayoutHelper.isSpecial(node as Element)) {\n          // Skip special\n          seekRange = !haveStart;\n        } else if (\n          (node as Element).localName == \"ruby\" ||\n          isSpecialInlineDisplay(\n            this.clientLayout.getElementComputedStyle(node as Element).display,\n          )\n        ) {\n          // ruby, inline-block, etc.\n          seekRange = !haveStart;\n          if (seekRange) {\n            range.setStartBefore(node);\n            haveStart = true;\n            lastGood = node;\n          }\n          if (node.contains(end)) {\n            endNotReached = false;\n          }\n        } else {\n          next = node.firstChild;\n        }\n        if (!next) {\n          next = node.nextSibling;\n          if (!next) {\n            wentUp = true;\n            next = node.parentNode;\n          }\n        }\n        node = next;\n      } while (seekRange && endNotReached);\n      if (haveStart) {\n        range.setEndAfter(lastGood);\n        const boxList = this.clientLayout.getRangeClientRects(range);\n        for (let i = 0; i < boxList.length; i++) {\n          arr.push(boxList[i]);\n        }\n        haveStart = false;\n      }\n    }\n    return arr;\n  }\n\n  /**\n   * Give block's initial and final nodes, find positions of the line bottoms.\n   * This is, of course, somewhat hacky implementation.\n   * @return position of line breaks\n   */\n  findLinePositions(checkPoints: Vtree.NodeContext[]): number[] {\n    const LOW_OVERLAP = 0.2;\n    const MID_OVERLAP = 0.6;\n    const positions = [];\n    const boxes = this.getRangeBoxes(\n      checkPoints[0].viewNode,\n      checkPoints[checkPoints.length - 1].viewNode,\n    );\n    boxes.sort(\n      this.vertical\n        ? VtreeImpl.clientrectDecreasingRight\n        : VtreeImpl.clientrectIncreasingTop,\n    );\n    let lineBefore = 0;\n    let lineAfter = 0;\n    let lineEnd = 0;\n    let lineLength = 0;\n    let i = 0;\n    const dir = this.getBoxDir();\n    while (true) {\n      if (i < boxes.length) {\n        const box = boxes[i];\n        let overlap = 1;\n        if (lineLength > 0) {\n          const boxSize = Math.max(this.getBoxSize(box), 1);\n          if (dir * this.getBeforeEdge(box) < dir * lineBefore) {\n            overlap = (dir * (this.getAfterEdge(box) - lineBefore)) / boxSize;\n          } else if (dir * this.getAfterEdge(box) > dir * lineAfter) {\n            overlap = (dir * (lineAfter - this.getBeforeEdge(box))) / boxSize;\n          } else {\n            overlap = 1;\n          }\n        }\n        if (\n          lineLength == 0 ||\n          overlap >= MID_OVERLAP ||\n          (overlap >= LOW_OVERLAP && this.getStartEdge(box) >= lineEnd - 1)\n        ) {\n          lineEnd = this.getEndEdge(box);\n          if (this.vertical) {\n            lineBefore =\n              lineLength == 0 ? box.right : Math.max(lineBefore, box.right);\n            lineAfter =\n              lineLength == 0 ? box.left : Math.min(lineAfter, box.left);\n          } else {\n            lineBefore =\n              lineLength == 0 ? box.top : Math.min(lineBefore, box.top);\n            lineAfter =\n              lineLength == 0 ? box.bottom : Math.max(lineAfter, box.bottom);\n          }\n          lineLength++;\n          i++;\n          continue;\n        }\n      }\n\n      // Add line\n      if (lineLength > 0) {\n        positions.push(lineAfter);\n        lineLength = 0;\n      }\n      if (i >= boxes.length) {\n        break;\n      }\n    }\n    positions.sort(Base.numberCompare);\n    if (this.vertical) {\n      positions.reverse();\n    }\n    return positions;\n  }\n\n  calculateClonedPaddingBorder(nodeContext: Vtree.NodeContext): number {\n    let clonedPaddingBorder = 0;\n    nodeContext.walkUpBlocks((block) => {\n      if (block.inheritedProps[\"box-decoration-break\"] === \"clone\") {\n        Asserts.assert(block.viewNode instanceof Element);\n        const paddingBorders = this.getComputedPaddingBorder(\n          block.viewNode as Element,\n        );\n        clonedPaddingBorder += block.vertical\n          ? -paddingBorders.left\n          : paddingBorders.bottom;\n        if (block.display === \"table\") {\n          clonedPaddingBorder += block.blockBorderSpacing;\n        }\n      }\n    });\n    return clonedPaddingBorder;\n  }\n\n  private getOffsetByRepetitiveElements(\n    bp?: BreakPosition.BreakPosition,\n  ): number {\n    let offset: { current: number; minimum: number };\n    if (bp) {\n      offset = bp.calculateOffset(this);\n    } else {\n      offset = BreakPosition.calculateOffset(\n        null,\n        this.collectElementsOffset(),\n      );\n    }\n    return offset.current;\n  }\n\n  findBoxBreakPosition(\n    bp: BoxBreakPosition,\n    force: boolean,\n  ): Vtree.NodeContext {\n    const self = this;\n    const checkPoints = bp.checkPoints;\n    let block = checkPoints[0];\n    while (block.parent && block.inline) {\n      block = block.parent;\n    }\n    let widows: number;\n    let orphans: number;\n    if (force) {\n      // Last resort, ignore widows/orphans\n      widows = 1;\n      orphans = 1;\n    } else {\n      // Get widows/orphans settings from the block element\n      widows = Math.max(\n        ((block.inheritedProps[\"widows\"] as number) || 2) - 0,\n        1,\n      );\n      orphans = Math.max(\n        ((block.inheritedProps[\"orphans\"] as number) || 2) - 0,\n        1,\n      );\n    }\n\n    // In case of box-decoration-break: clone, width (or height in vertical\n    // writing mode) of cloned paddings and borders should be taken into\n    // account.\n    const clonedPaddingBorder = self.calculateClonedPaddingBorder(block);\n\n    // Select the first overflowing line break position\n    const linePositions = this.findLinePositions(checkPoints);\n    let edge = this.footnoteEdge - clonedPaddingBorder;\n    const dir = this.getBoxDir();\n    const repetitiveElementsOffset = this.getOffsetByRepetitiveElements(bp);\n    edge -= dir * repetitiveElementsOffset;\n\n    // If an \"overflowing\" checkpoint (e.g. not allowed by LayoutConstraint)\n    // exists before the edge, a line containing the checkpoint should be\n    // deferred to the next column.\n    const firstOverflowing = this.findFirstOverflowingEdgeAndCheckPoint(\n      checkPoints,\n    );\n    if (isNaN(firstOverflowing.edge)) {\n      firstOverflowing.edge = dir * Infinity;\n    }\n    let lineIndex = Base.binarySearch(linePositions.length, (i) => {\n      const p = linePositions[i];\n      return self.vertical\n        ? p < edge || p <= firstOverflowing.edge\n        : p > edge || p >= firstOverflowing.edge;\n    });\n\n    // If no break point is found due to the \"overflowing\" checkpoint,\n    // give up deferring a line containing the checkpoint and try to cut the\n    // line just before it.\n    const forceCutBeforeOverflowing = lineIndex <= 0;\n    if (forceCutBeforeOverflowing) {\n      lineIndex = Base.binarySearch(linePositions.length, (i) =>\n        self.vertical ? linePositions[i] < edge : linePositions[i] > edge,\n      );\n    }\n\n    // First edge after the one that both fits and satisfies widows constraint.\n    lineIndex = Math.min(linePositions.length - widows, lineIndex);\n    if (lineIndex < orphans) {\n      // Not enough lines to satisfy orphans constraint, cannot break here.\n      return null;\n    }\n    edge = linePositions[lineIndex - 1];\n    let nodeContext: Vtree.NodeContext;\n    if (forceCutBeforeOverflowing) {\n      nodeContext = firstOverflowing.checkPoint;\n    } else {\n      nodeContext = this.findAcceptableBreakInside(bp.checkPoints, edge, force);\n    }\n    if (nodeContext) {\n      // When line-height is small, the edge calculated above (using Range)\n      // can be larger than the edge of the block container containing the text.\n      // We update the edge by measuring the block edge.\n      const blockEdge = this.getAfterEdgeOfBlockContainer(nodeContext);\n      if (!isNaN(blockEdge) && blockEdge < edge) {\n        edge = blockEdge;\n      }\n      this.computedBlockSize =\n        dir * (edge - this.beforeEdge) + repetitiveElementsOffset;\n    }\n    return nodeContext;\n  }\n\n  getAfterEdgeOfBlockContainer(nodeContext: Vtree.NodeContext): number {\n    let blockParent = nodeContext;\n    do {\n      blockParent = blockParent.parent;\n    } while (blockParent && blockParent.inline);\n    if (blockParent) {\n      blockParent = blockParent.copy().modify();\n      blockParent.after = true;\n      return LayoutHelper.calculateEdge(\n        blockParent,\n        this.clientLayout,\n        0,\n        this.vertical,\n      );\n    } else {\n      return NaN;\n    }\n  }\n\n  findFirstOverflowingEdgeAndCheckPoint(\n    checkPoints: Vtree.NodeContext[],\n  ): { edge: number; checkPoint: Vtree.NodeContext | null } {\n    const index = checkPoints.findIndex((cp) => cp.overflow);\n    if (index < 0) {\n      return { edge: NaN, checkPoint: null };\n    }\n    const cp = checkPoints[index];\n    return {\n      edge: this.calculateEdge(null, checkPoints, index, cp.boxOffset),\n      checkPoint: cp,\n    };\n  }\n\n  findEdgeBreakPosition(\n    bp: BreakPosition.EdgeBreakPosition,\n  ): Vtree.NodeContext {\n    this.computedBlockSize =\n      bp.computedBlockSize + this.getOffsetByRepetitiveElements(bp);\n    return bp.position;\n  }\n\n  /**\n   * Finalize a line break.\n   * @return holing true\n   */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean> {\n    Asserts.assert(nodeContext.formattingContext);\n    const layoutProcessor = new LayoutProcessor.LayoutProcessorResolver().find(\n      nodeContext.formattingContext,\n    );\n    let result = layoutProcessor.finishBreak(\n      this,\n      nodeContext,\n      forceRemoveSelf,\n      endOfColumn,\n    );\n    if (!result) {\n      result = LayoutProcessor.blockLayoutProcessor.finishBreak(\n        this,\n        nodeContext,\n        forceRemoveSelf,\n        endOfColumn,\n      );\n    }\n    return result;\n  }\n\n  findAcceptableBreakPosition(): BreakPositionAndNodeContext {\n    let bp: Layout.BreakPosition = null;\n    let nodeContext: Vtree.NodeContext = null;\n    let penalty = 0;\n    let nextPenalty = 0;\n    do {\n      penalty = nextPenalty;\n      nextPenalty = Number.MAX_VALUE;\n      for (\n        let i = this.breakPositions.length - 1;\n        i >= 0 && !nodeContext;\n        --i\n      ) {\n        bp = this.breakPositions[i];\n        nodeContext = bp.findAcceptableBreak(this, penalty);\n        const minPenalty = bp.getMinBreakPenalty();\n        if (minPenalty > penalty) {\n          nextPenalty = Math.min(nextPenalty, minPenalty);\n        }\n      }\n    } while (\n      // Don't need to find a non-optimal break position if\n      // forceNonfitting=false\n      nextPenalty > penalty &&\n      !nodeContext &&\n      this.forceNonfitting\n    );\n    return { breakPosition: nodeContext ? bp : null, nodeContext };\n  }\n\n  doFinishBreak(\n    nodeContext: Vtree.NodeContext,\n    overflownNodeContext: Vtree.NodeContext,\n    initialNodeContext: Vtree.NodeContext,\n    initialComputedBlockSize: number,\n  ): Task.Result<Vtree.NodeContext> {\n    if (\n      this.pageFloatLayoutContext.isInvalidated() ||\n      this.pageBreakType ||\n      !overflownNodeContext\n    ) {\n      return Task.newResult(nodeContext);\n    }\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"doFinishBreak\");\n    let forceRemoveSelf = false;\n    if (!nodeContext) {\n      // Last resort\n      if (this.forceNonfitting) {\n        Logging.logger.warn(\"Could not find any page breaks?!!\");\n        self.skipTailEdges(overflownNodeContext).then((nodeContext) => {\n          if (nodeContext) {\n            nodeContext = nodeContext.modify();\n            nodeContext.overflow = false;\n            self.finishBreak(nodeContext, forceRemoveSelf, true).then(() => {\n              frame.finish(nodeContext);\n            });\n          } else {\n            frame.finish(nodeContext);\n          }\n        });\n        return frame.result();\n      } else {\n        nodeContext = initialNodeContext;\n        forceRemoveSelf = true;\n        self.computedBlockSize = initialComputedBlockSize;\n      }\n    }\n    this.finishBreak(nodeContext, forceRemoveSelf, true).then(() => {\n      frame.finish(nodeContext);\n    });\n    return frame.result();\n  }\n\n  /**\n   * Determines if a page break is acceptable at this position\n   */\n  isBreakable(flowPosition: Vtree.NodeContext): boolean {\n    if (flowPosition.after) {\n      return true; // may be an empty block\n    }\n    switch (flowPosition.sourceNode.namespaceURI) {\n      case Base.NS.SVG:\n        return false;\n    }\n    return !flowPosition.flexContainer;\n  }\n\n  /**\n   * Determines if an indent value is zero\n   */\n  zeroIndent(val: string | number): boolean {\n    const s = val.toString();\n    return s == \"\" || s == \"auto\" || !!s.match(/^0+(.0*)?[^0-9]/);\n  }\n\n  /**\n   * @return true if overflows\n   */\n  checkOverflowAndSaveEdge(\n    nodeContext: Vtree.NodeContext,\n    trailingEdgeContexts: Vtree.NodeContext[],\n  ): boolean {\n    if (!nodeContext) {\n      return false;\n    }\n    if (LayoutHelper.isOrphan(nodeContext.viewNode)) {\n      return false;\n    }\n    let edge = LayoutHelper.calculateEdge(\n      nodeContext,\n      this.clientLayout,\n      0,\n      this.vertical,\n    );\n    const offsets = BreakPosition.calculateOffset(\n      nodeContext,\n      this.collectElementsOffset(),\n    );\n    const overflown = this.isOverflown(\n      edge + (this.vertical ? -1 : 1) * offsets.minimum,\n    );\n    if (\n      this.isOverflown(edge + (this.vertical ? -1 : 1) * offsets.current) &&\n      !this.nodeContextOverflowingDueToRepetitiveElements\n    ) {\n      this.nodeContextOverflowingDueToRepetitiveElements = nodeContext;\n    } else if (trailingEdgeContexts) {\n      // If the edge does not overflow add the trailing margin, which is\n      // truncated to the remaining fragmentainer extent.\n      const marginEdge =\n        edge + this.getTrailingMarginEdgeAdjustment(trailingEdgeContexts);\n      const footnoteEdge =\n        this.footnoteEdge - this.getBoxDir() * offsets.current;\n      edge = this.vertical\n        ? Math.min(edge, Math.max(marginEdge, footnoteEdge))\n        : Math.max(edge, Math.min(marginEdge, footnoteEdge));\n    }\n    this.updateMaxReachedAfterEdge(edge);\n    return overflown;\n  }\n\n  /**\n   * Save a possible page break position on a CSS block edge. Check if it\n   * overflows.\n   * @return true if overflows\n   */\n  checkOverflowAndSaveEdgeAndBreakPosition(\n    nodeContext: Vtree.NodeContext,\n    trailingEdgeContexts: Vtree.NodeContext[],\n    saveEvenOverflown: boolean,\n    breakAtTheEdge: string | null,\n  ): boolean {\n    if (!nodeContext) {\n      return false;\n    }\n    if (LayoutHelper.isOrphan(nodeContext.viewNode)) {\n      return false;\n    }\n    const overflown = this.checkOverflowAndSaveEdge(\n      nodeContext,\n      trailingEdgeContexts,\n    );\n    if (saveEvenOverflown || !overflown) {\n      this.saveEdgeBreakPosition(nodeContext, breakAtTheEdge, overflown);\n    }\n    return overflown;\n  }\n\n  applyClearance(nodeContext: Vtree.NodeContext): boolean {\n    if (!nodeContext.viewNode.parentNode) {\n      // Cannot do ceralance for nodes without parents\n      return false;\n    }\n\n    // measure where the edge of the element would be without clearance\n    const margin = this.getComputedMargin(nodeContext.viewNode as Element);\n    const spacer = nodeContext.viewNode.ownerDocument.createElement(\"div\");\n    if (this.vertical) {\n      spacer.style.bottom = \"0px\";\n      spacer.style.width = \"1px\";\n      spacer.style.marginRight = `${margin.right}px`;\n    } else {\n      spacer.style.right = \"0px\";\n      spacer.style.height = \"1px\";\n      spacer.style.marginTop = `${margin.top}px`;\n    }\n    nodeContext.viewNode.parentNode.insertBefore(spacer, nodeContext.viewNode);\n    let spacerBox = this.clientLayout.getElementClientRect(spacer);\n    const edge = this.getBeforeEdge(spacerBox);\n    const dir = this.getBoxDir();\n    const clear = nodeContext.clearSide;\n    let clearEdge = -this.getBoxDir() * Infinity;\n    if (clear === \"all\") {\n      clearEdge = this.pageFloatLayoutContext.getPageFloatClearEdge(\n        clear,\n        this,\n      );\n    }\n    switch (clear) {\n      case \"left\":\n        clearEdge = dir * Math.max(clearEdge * dir, this.leftFloatEdge * dir);\n        break;\n      case \"right\":\n        clearEdge = dir * Math.max(clearEdge * dir, this.rightFloatEdge * dir);\n        break;\n      default:\n        clearEdge =\n          dir *\n          Math.max(\n            clearEdge * dir,\n            Math.max(this.rightFloatEdge * dir, this.leftFloatEdge * dir),\n          );\n    }\n\n    // edge holds the position where element border \"before\" edge will be\n    // without clearance. clearEdge is the \"after\" edge of the float to clear.\n    if (edge * dir >= clearEdge * dir) {\n      // No need for clearance\n      nodeContext.viewNode.parentNode.removeChild(spacer);\n      return false;\n    } else {\n      // Need some clearance, determine how much. Add the clearance node,\n      // measure its after edge and adjust after margin (required due to\n      // possible margin collapse before clearance was introduced).\n      const height = Math.max(1, (clearEdge - edge) * dir);\n      if (this.vertical) {\n        spacer.style.width = `${height}px`;\n      } else {\n        spacer.style.height = `${height}px`;\n      }\n      spacerBox = this.clientLayout.getElementClientRect(spacer);\n      const afterEdge = this.getAfterEdge(spacerBox);\n      if (this.vertical) {\n        let wAdj = afterEdge + margin.right - clearEdge;\n        if (wAdj > 0 == margin.right >= 0) {\n          // In addition to collapsed portion\n          wAdj += margin.right;\n        }\n        spacer.style.marginLeft = `${wAdj}px`;\n      } else {\n        let hAdj = clearEdge - (afterEdge + margin.top);\n        if (hAdj > 0 == margin.top >= 0) {\n          // In addition to collapsed portion\n          hAdj += margin.top;\n        }\n        spacer.style.marginBottom = `${hAdj}px`;\n      }\n      nodeContext.clearSpacer = spacer;\n      return true;\n    }\n  }\n\n  isBFC(formattingContext: Vtree.FormattingContext): boolean {\n    if (LayoutProcessor.isInstanceOfBlockFormattingContext(formattingContext)) {\n      return true;\n    }\n    if (\n      RepetitiveElement.isInstanceOfRepetitiveElementsOwnerFormattingContext(\n        formattingContext,\n      )\n    ) {\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * Skips positions until either the start of unbreakable block or inline\n   * content. Also sets breakBefore on the result combining break-before and\n   * break-after properties from all elements that meet at the edge.\n   */\n  skipEdges(\n    nodeContext: Vtree.NodeContext,\n    leadingEdge: boolean,\n    forcedBreakValue: string | null,\n  ): Task.Result<Vtree.NodeContext> {\n    const fc = nodeContext.after\n      ? nodeContext.parent && nodeContext.parent.formattingContext\n      : nodeContext.formattingContext;\n    if (fc && !this.isBFC(fc)) {\n      return Task.newResult(nodeContext);\n    }\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"skipEdges\");\n\n    // If a forced break occurred at the end of the previous column,\n    // nodeContext.after should be false.\n    let atUnforcedBreak =\n      !forcedBreakValue && leadingEdge && nodeContext && nodeContext.after;\n    let breakAtTheEdge = forcedBreakValue;\n    let lastAfterNodeContext: Vtree.NodeContext = null;\n    let leadingEdgeContexts: Vtree.NodeContext[] = [];\n    let trailingEdgeContexts: Vtree.NodeContext[] = [];\n    let onStartEdges = false;\n\n    function needForcedBreak() {\n      // leadingEdge=true means that we are at the beginning of the new column\n      // and hence must avoid a break (Otherwise leading to an infinite loop)\n      return (\n        !!forcedBreakValue ||\n        (!leadingEdge && Break.isForcedBreakValue(breakAtTheEdge))\n      );\n    }\n\n    function processForcedBreak() {\n      nodeContext = leadingEdgeContexts[0] || nodeContext;\n      nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n      self.pageBreakType = breakAtTheEdge;\n    }\n    frame\n      .loopWithFrame((loopFrame) => {\n        while (nodeContext) {\n          Asserts.assert(nodeContext.formattingContext);\n          const layoutProcessor = new LayoutProcessor.LayoutProcessorResolver().find(\n            nodeContext.formattingContext,\n          );\n\n          // A code block to be able to use break. Break moves to the next\n          // node position.\n          do {\n            if (!nodeContext.viewNode) {\n              // Non-displayable content, skip\n              break;\n            }\n            if (nodeContext.inline && nodeContext.viewNode.nodeType != 1) {\n              if (\n                VtreeImpl.canIgnore(\n                  nodeContext.viewNode,\n                  nodeContext.whitespace,\n                )\n              ) {\n                // Ignorable text content, skip\n                break;\n              }\n              if (!nodeContext.after) {\n                // Leading edge of non-empty block -> finished going through\n                // all starting edges of the box\n                if (needForcedBreak()) {\n                  processForcedBreak();\n                } else if (\n                  self.checkOverflowAndSaveEdgeAndBreakPosition(\n                    lastAfterNodeContext,\n                    null,\n                    true,\n                    breakAtTheEdge,\n                  )\n                ) {\n                  nodeContext = (self.stopAtOverflow\n                    ? lastAfterNodeContext || nodeContext\n                    : nodeContext\n                  ).modify();\n                  nodeContext.overflow = true;\n                } else {\n                  nodeContext = nodeContext.modify();\n                  nodeContext.breakBefore = breakAtTheEdge;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n            }\n            if (!nodeContext.after) {\n              if (layoutProcessor) {\n                if (layoutProcessor.startNonInlineElementNode(nodeContext)) {\n                  break;\n                }\n              }\n              if (nodeContext.clearSide) {\n                // clear\n                if (\n                  self.applyClearance(nodeContext) &&\n                  leadingEdge &&\n                  self.breakPositions.length === 0\n                ) {\n                  self.saveEdgeBreakPosition(\n                    nodeContext.copy(),\n                    breakAtTheEdge,\n                    false,\n                  );\n                }\n              }\n              if (\n                !self.isBFC(nodeContext.formattingContext) ||\n                RepetitiveElement.isInstanceOfRepetitiveElementsOwnerFormattingContext(\n                  nodeContext.formattingContext,\n                ) ||\n                self.isFloatNodeContext(nodeContext) ||\n                nodeContext.flexContainer\n              ) {\n                // new formatting context, or float or flex container\n                // (unbreakable)\n                leadingEdgeContexts.push(nodeContext.copy());\n                breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                  breakAtTheEdge,\n                  nodeContext.breakBefore,\n                );\n\n                // check if a forced break must occur before the block.\n                if (needForcedBreak()) {\n                  processForcedBreak();\n                } else if (\n                  self.checkOverflowAndSaveEdgeAndBreakPosition(\n                    lastAfterNodeContext,\n                    null,\n                    true,\n                    breakAtTheEdge,\n                  ) ||\n                  !self.layoutConstraint.allowLayout(nodeContext)\n                ) {\n                  // overflow\n                  nodeContext = (self.stopAtOverflow\n                    ? lastAfterNodeContext || nodeContext\n                    : nodeContext\n                  ).modify();\n                  nodeContext.overflow = true;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n            }\n            if (nodeContext.viewNode.nodeType != 1) {\n              // not an element\n              break;\n            }\n            const style = (nodeContext.viewNode as HTMLElement).style;\n            if (nodeContext.after) {\n              // Skip an empty inline box at the start of a block\n              // (An anonymous block consisting entirely of\n              // collapsible white space is removed from the rendering tree)\n              if (nodeContext.inline) {\n                break;\n              }\n              if (layoutProcessor) {\n                if (\n                  layoutProcessor.afterNonInlineElementNode(\n                    nodeContext,\n                    self.stopAtOverflow,\n                  )\n                ) {\n                  break;\n                }\n              }\n\n              // Trailing edge\n              if (onStartEdges) {\n                // finished going through all starting edges of the box.\n                // check if a forced break must occur before the block.\n                if (needForcedBreak()) {\n                  processForcedBreak();\n                  loopFrame.breakLoop();\n                  return;\n                }\n\n                // since a break did not occur, move to the next edge. this\n                // edge is no longer the leading edge.\n                leadingEdgeContexts = [];\n                leadingEdge = false;\n                atUnforcedBreak = false;\n                breakAtTheEdge = null;\n              }\n              onStartEdges = false; // we are now on end edges.\n              lastAfterNodeContext = nodeContext.copy();\n              trailingEdgeContexts.push(lastAfterNodeContext);\n              breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                breakAtTheEdge,\n                nodeContext.breakAfter,\n              );\n              if (\n                style &&\n                !(\n                  self.zeroIndent(style.paddingBottom) &&\n                  self.zeroIndent(style.borderBottomWidth)\n                )\n              ) {\n                // Non-zero trailing inset.\n                // Margins don't collapse across non-zero borders and\n                // paddings.\n                trailingEdgeContexts = [lastAfterNodeContext];\n              }\n            } else {\n              // Leading edge\n              leadingEdgeContexts.push(nodeContext.copy());\n              breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                breakAtTheEdge,\n                nodeContext.breakBefore,\n              );\n              if (!self.layoutConstraint.allowLayout(nodeContext)) {\n                self.checkOverflowAndSaveEdgeAndBreakPosition(\n                  lastAfterNodeContext,\n                  null,\n                  !self.stopAtOverflow,\n                  breakAtTheEdge,\n                );\n                nodeContext = nodeContext.modify();\n                nodeContext.overflow = true;\n                if (self.stopAtOverflow) {\n                  loopFrame.breakLoop();\n                  return;\n                }\n              }\n              const viewTag = (nodeContext.viewNode as Element).localName;\n              if (mediaTags[viewTag]) {\n                // elements that have inherent content\n                // check if a forced break must occur before the block.\n                if (needForcedBreak()) {\n                  processForcedBreak();\n                } else if (\n                  self.checkOverflowAndSaveEdgeAndBreakPosition(\n                    lastAfterNodeContext,\n                    null,\n                    true,\n                    breakAtTheEdge,\n                  )\n                ) {\n                  // overflow\n                  nodeContext = (self.stopAtOverflow\n                    ? lastAfterNodeContext || nodeContext\n                    : nodeContext\n                  ).modify();\n                  nodeContext.overflow = true;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n              if (\n                style &&\n                !(\n                  self.zeroIndent(style.paddingTop) &&\n                  self.zeroIndent(style.borderTopWidth)\n                )\n              ) {\n                // Non-zero leading inset\n                atUnforcedBreak = false;\n                trailingEdgeContexts = [];\n              }\n              onStartEdges = true; // we are now on starting edges.\n            }\n          } while (false); // End of block of code to use break\n\n          const nextResult = self.nextInTree(nodeContext, atUnforcedBreak);\n          if (nextResult.isPending()) {\n            nextResult.then((nodeContextParam) => {\n              nodeContext = nodeContextParam;\n              loopFrame.continueLoop();\n            });\n            return;\n          } else {\n            nodeContext = nextResult.get();\n          }\n        }\n\n        if (\n          self.checkOverflowAndSaveEdgeAndBreakPosition(\n            lastAfterNodeContext,\n            trailingEdgeContexts,\n            !self.stopAtOverflow,\n            breakAtTheEdge,\n          )\n        ) {\n          if (lastAfterNodeContext && self.stopAtOverflow) {\n            nodeContext = lastAfterNodeContext.modify();\n            nodeContext.overflow = true;\n          } else {\n            // TODO: what to return here??\n          }\n        } else if (Break.isForcedBreakValue(breakAtTheEdge)) {\n          self.pageBreakType = breakAtTheEdge;\n        }\n        loopFrame.breakLoop();\n      })\n      .then(() => {\n        if (lastAfterNodeContext) {\n          self.lastAfterPosition = lastAfterNodeContext.toNodePosition();\n        }\n        frame.finish(nodeContext);\n      });\n    return frame.result();\n  }\n\n  /**\n   * Skips non-renderable positions until it hits the end of the flow or some\n   * renderable content. Returns the nodeContext that was passed in if some\n   * content remains and null if all content could be skipped.\n   */\n  skipTailEdges(\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    let resultNodeContext = nodeContext.copy();\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"skipEdges\");\n    let breakAtTheEdge: string | null = null;\n    let onStartEdges = false;\n    frame\n      .loopWithFrame((loopFrame) => {\n        while (nodeContext) {\n          // A code block to be able to use break. Break moves to the next\n          // node position.\n          do {\n            if (!nodeContext.viewNode) {\n              // Non-displayable content, skip\n              break;\n            }\n            if (nodeContext.inline && nodeContext.viewNode.nodeType != 1) {\n              if (\n                VtreeImpl.canIgnore(\n                  nodeContext.viewNode,\n                  nodeContext.whitespace,\n                )\n              ) {\n                // Ignorable text content, skip\n                break;\n              }\n              if (!nodeContext.after) {\n                // Leading edge of non-empty block -> finished going through\n                // all starting edges of the box\n                if (Break.isForcedBreakValue(breakAtTheEdge)) {\n                  self.pageBreakType = breakAtTheEdge;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n            }\n            if (!nodeContext.after) {\n              if (\n                self.isFloatNodeContext(nodeContext) ||\n                nodeContext.flexContainer\n              ) {\n                // float or flex container (unbreakable)\n                breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                  breakAtTheEdge,\n                  nodeContext.breakBefore,\n                );\n\n                // check if a forced break must occur before the block.\n                if (Break.isForcedBreakValue(breakAtTheEdge)) {\n                  self.pageBreakType = breakAtTheEdge;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n            }\n            if (nodeContext.viewNode.nodeType != 1) {\n              // not an element\n              break;\n            }\n            const style = (nodeContext.viewNode as HTMLElement).style;\n            if (nodeContext.after) {\n              // Trailing edge\n              if (onStartEdges) {\n                // finished going through all starting edges of the box.\n                // check if a forced break must occur before the block.\n                if (Break.isForcedBreakValue(breakAtTheEdge)) {\n                  self.pageBreakType = breakAtTheEdge;\n                  loopFrame.breakLoop();\n                  return;\n                }\n\n                // since a break did not occur, move to the next edge.\n                breakAtTheEdge = null;\n              }\n              onStartEdges = false; // we are now on end edges.\n              breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                breakAtTheEdge,\n                nodeContext.breakAfter,\n              );\n            } else {\n              // Leading edge\n              breakAtTheEdge = Break.resolveEffectiveBreakValue(\n                breakAtTheEdge,\n                nodeContext.breakBefore,\n              );\n              const viewTag = (nodeContext.viewNode as Element).localName;\n              if (mediaTags[viewTag]) {\n                // elements that have inherent content\n                // check if a forced break must occur before the block.\n                if (Break.isForcedBreakValue(breakAtTheEdge)) {\n                  self.pageBreakType = breakAtTheEdge;\n                }\n                loopFrame.breakLoop();\n                return;\n              }\n              if (\n                style &&\n                !(\n                  self.zeroIndent(style.paddingTop) &&\n                  self.zeroIndent(style.borderTopWidth)\n                )\n              ) {\n                // Non-zero leading inset\n                loopFrame.breakLoop();\n                return;\n              }\n            }\n            onStartEdges = true; // we are now on starting edges.\n          } while (false); // End of block of code to use break\n\n          const nextResult = self.layoutContext.nextInTree(nodeContext);\n          if (nextResult.isPending()) {\n            nextResult.then((nodeContextParam) => {\n              nodeContext = nodeContextParam;\n              loopFrame.continueLoop();\n            });\n            return;\n          } else {\n            nodeContext = nextResult.get();\n          }\n        }\n        resultNodeContext = null;\n        loopFrame.breakLoop();\n      })\n      .then(() => {\n        frame.finish(resultNodeContext);\n      });\n    return frame.result();\n  }\n\n  layoutFloatOrFootnote(\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<Vtree.NodeContext> {\n    if (\n      PageFloats.isPageFloat(nodeContext.floatReference) ||\n      nodeContext.floatSide === \"footnote\"\n    ) {\n      return this.layoutPageFloat(nodeContext);\n    } else {\n      return this.layoutFloat(nodeContext);\n    }\n  }\n\n  /**\n   * Layout next portion of the source.\n   */\n  layoutNext(\n    nodeContext: Vtree.NodeContext,\n    leadingEdge: boolean,\n    forcedBreakValue?: string | null,\n  ): Task.Result<Vtree.NodeContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"layoutNext\");\n    this.skipEdges(nodeContext, leadingEdge, forcedBreakValue || null).then(\n      (nodeContextParam) => {\n        nodeContext = nodeContextParam as Vtree.NodeContext;\n        if (\n          !nodeContext ||\n          self.pageBreakType ||\n          self.stopByOverflow(nodeContext)\n        ) {\n          // finished all content, explicit page break or overflow (automatic\n          // page break)\n          frame.finish(nodeContext);\n        } else {\n          const formattingContext = nodeContext.formattingContext;\n          Asserts.assert(formattingContext);\n          const layoutProcessor = new LayoutProcessor.LayoutProcessorResolver().find(\n            formattingContext,\n          );\n          layoutProcessor\n            .layout(nodeContext, self, leadingEdge)\n            .thenFinish(frame);\n        }\n      },\n    );\n    return frame.result();\n  }\n\n  clearOverflownViewNodes(\n    nodeContext: Vtree.NodeContext,\n    removeSelf: boolean,\n  ): void {\n    if (!nodeContext) {\n      return;\n    }\n    for (\n      let parent = nodeContext.parent;\n      nodeContext;\n      nodeContext = parent, parent = parent ? parent.parent : null\n    ) {\n      const formattingContext = (parent || nodeContext).formattingContext;\n      Asserts.assert(formattingContext);\n      const layoutProcessor = new LayoutProcessor.LayoutProcessorResolver().find(\n        formattingContext,\n      );\n      layoutProcessor.clearOverflownViewNodes(\n        this,\n        parent,\n        nodeContext,\n        removeSelf,\n      );\n      removeSelf = false;\n    }\n  }\n\n  initGeom(): void {\n    // TODO: we should be able to avoid querying the layout engine at this\n    // point. Create an element that fills the content area and query its size.\n    // Calling getElementClientRect on the container element includes element\n    // padding which is wrong for our purposes.\n    const probe = this.element.ownerDocument.createElement(\n      \"div\",\n    ) as HTMLElement;\n    probe.style.position = \"absolute\";\n    probe.style.top = `${this.paddingTop}px`;\n    probe.style.right = `${this.paddingRight}px`;\n    probe.style.bottom = `${this.paddingBottom}px`;\n    probe.style.left = `${this.paddingLeft}px`;\n    this.element.appendChild(probe);\n    const columnBBox = this.clientLayout.getElementClientRect(probe);\n    this.element.removeChild(probe);\n    const offsetX = this.originX + this.left + this.getInsetLeft();\n    const offsetY = this.originY + this.top + this.getInsetTop();\n    this.box = new GeometryUtil.Rect(\n      offsetX,\n      offsetY,\n      offsetX + this.width,\n      offsetY + this.height,\n    );\n    this.startEdge = columnBBox\n      ? this.vertical\n        ? columnBBox.top\n        : columnBBox.left\n      : 0;\n    this.endEdge = columnBBox\n      ? this.vertical\n        ? columnBBox.bottom\n        : columnBBox.right\n      : 0;\n    this.beforeEdge = columnBBox\n      ? this.vertical\n        ? columnBBox.right\n        : columnBBox.top\n      : 0;\n    this.afterEdge = columnBBox\n      ? this.vertical\n        ? columnBBox.left\n        : columnBBox.bottom\n      : 0;\n    this.leftFloatEdge = this.beforeEdge;\n    this.rightFloatEdge = this.beforeEdge;\n    this.bottommostFloatTop = this.beforeEdge;\n    this.footnoteEdge = this.afterEdge;\n    this.bands = GeometryUtil.shapesToBands(\n      this.box,\n      [this.getInnerShape()],\n      this.getExclusions(),\n      8,\n      this.snapHeight,\n      this.vertical,\n    );\n    this.createFloats();\n  }\n\n  init(): void {\n    this.chunkPositions = [];\n    Base.setCSSProperty(this.element, \"width\", `${this.width}px`);\n    Base.setCSSProperty(this.element, \"height\", `${this.height}px`);\n    this.initGeom();\n    this.computedBlockSize = 0;\n    this.overflown = false;\n    this.pageBreakType = null;\n    this.lastAfterPosition = null;\n  }\n\n  /**\n   * Save the potential breaking position at the edge. Should, in general, save\n   * \"after\" position but only after skipping all of the \"before\" ones and\n   * getting to the non-empty content (to get breakAtEdge right).\n   */\n  saveEdgeBreakPosition(\n    position: Vtree.NodeContext,\n    breakAtEdge: string | null,\n    overflows: boolean,\n  ): void {\n    Asserts.assert(position.formattingContext);\n    const copy = position.copy();\n    const layoutProcessor = new LayoutProcessor.LayoutProcessorResolver().find(\n      position.formattingContext,\n    );\n    const clonedPaddingBorder = this.calculateClonedPaddingBorder(copy);\n    const bp = layoutProcessor.createEdgeBreakPosition(\n      copy,\n      breakAtEdge,\n      overflows,\n      this.computedBlockSize + clonedPaddingBorder,\n    );\n    this.breakPositions.push(bp);\n  }\n\n  /**\n   * @param checkPoints array of breaking points for breakable block\n   */\n  saveBoxBreakPosition(checkPoints: Vtree.NodeContext[]): void {\n    const penalty = checkPoints[0].breakPenalty;\n    const bp = new BoxBreakPosition(checkPoints, penalty);\n    this.breakPositions.push(bp);\n  }\n\n  updateMaxReachedAfterEdge(afterEdge: number) {\n    if (!isNaN(afterEdge)) {\n      const size = this.getBoxDir() * (afterEdge - this.beforeEdge);\n      this.computedBlockSize = Math.max(size, this.computedBlockSize);\n    }\n  }\n\n  /**\n   * @param chunkPosition starting position.\n   * @return holding end position.\n   */\n  layout(\n    chunkPosition: Vtree.ChunkPosition,\n    leadingEdge: boolean,\n    breakAfter?: string | null,\n  ): Task.Result<Vtree.ChunkPosition> {\n    this.chunkPositions.push(chunkPosition); // So we can re-layout this column later\n    if (chunkPosition.primary.after) {\n      this.lastAfterPosition = chunkPosition.primary;\n    }\n    if (this.stopAtOverflow && this.overflown) {\n      return Task.newResult(chunkPosition as Vtree.ChunkPosition);\n    }\n    if (this.isFullWithPageFloats()) {\n      if (\n        chunkPosition.primary.after &&\n        chunkPosition.primary.steps.length === 1\n      ) {\n        // End of contents\n        return Task.newResult(null as Vtree.ChunkPosition);\n      } else {\n        return Task.newResult(chunkPosition as Vtree.ChunkPosition);\n      }\n    }\n    const self = this;\n    const frame: Task.Frame<Vtree.ChunkPosition> = Task.newFrame(\"layout\");\n\n    // ------ start the column -----------\n    self.openAllViews(chunkPosition.primary).then((nodeContext) => {\n      let initialNodeContext: Vtree.NodeContext = null;\n      if (nodeContext.viewNode) {\n        initialNodeContext = nodeContext.copy();\n      } else {\n        const nextInTreeListener = (evt) => {\n          if (evt.nodeContext.viewNode) {\n            initialNodeContext = evt.nodeContext;\n            self.layoutContext.removeEventListener(\n              \"nextInTree\",\n              nextInTreeListener,\n            );\n          }\n        };\n        self.layoutContext.addEventListener(\"nextInTree\", nextInTreeListener);\n      }\n      const retryer = new ColumnLayoutRetryer(leadingEdge, breakAfter);\n      retryer.layout(nodeContext, self).then((nodeContextParam) => {\n        self\n          .doFinishBreak(\n            nodeContextParam,\n            retryer.context.overflownNodeContext,\n            initialNodeContext,\n            retryer.initialComputedBlockSize,\n          )\n          .then((positionAfter) => {\n            let cont: Task.Result<boolean> = null;\n            if (!self.pseudoParent) {\n              cont = self.doFinishBreakOfFragmentLayoutConstraints(\n                positionAfter,\n              );\n            } else {\n              cont = Task.newResult(null);\n            }\n            cont.then(() => {\n              if (self.pageFloatLayoutContext.isInvalidated()) {\n                frame.finish(null);\n                return;\n              }\n              if (!positionAfter) {\n                frame.finish(null);\n              } else {\n                self.overflown = true;\n                const result = new VtreeImpl.ChunkPosition(\n                  positionAfter.toNodePosition(),\n                );\n                frame.finish(result);\n              }\n            });\n          });\n      });\n    });\n    return frame.result();\n  }\n\n  isFullWithPageFloats(): boolean {\n    return this.pageFloatLayoutContext.isColumnFullWithPageFloats(this);\n  }\n\n  getMaxBlockSizeOfPageFloats(): number {\n    return this.pageFloatLayoutContext.getMaxBlockSizeOfPageFloats();\n  }\n\n  doFinishBreakOfFragmentLayoutConstraints(\n    nodeContext: Vtree.NodeContext,\n  ): Task.Result<boolean> {\n    const frame: Task.Frame<boolean> = Task.newFrame(\n      \"doFinishBreakOfFragmentLayoutConstraints\",\n    );\n    const sortedFragmentLayoutConstraints = [].concat(\n      this.fragmentLayoutConstraints,\n    );\n    sortedFragmentLayoutConstraints.sort(\n      (a, b) => a.getPriorityOfFinishBreak() - b.getPriorityOfFinishBreak(),\n    );\n    let i = 0;\n    frame\n      .loop(() => {\n        if (i < sortedFragmentLayoutConstraints.length) {\n          const result = sortedFragmentLayoutConstraints[i++].finishBreak(\n            nodeContext,\n            this,\n          );\n          return result.thenReturn(true);\n        } else {\n          return Task.newResult(false);\n        }\n      })\n      .then(() => {\n        frame.finish(true);\n      });\n    return frame.result();\n  }\n\n  /**\n   * @param nodeContext starting position.\n   * @return holding end position.\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    leadingEdge: boolean,\n    breakAfter?: string | null,\n  ): Task.Result<{\n    nodeContext: Vtree.NodeContext;\n    overflownNodeContext: Vtree.NodeContext;\n  }> {\n    const self = this;\n    const frame: Task.Frame<{\n      nodeContext: Vtree.NodeContext;\n      overflownNodeContext: Vtree.NodeContext;\n    }> = Task.newFrame(\"doLayout\");\n    let overflownNodeContext: Vtree.NodeContext = null;\n\n    // ------ init backtracking list -----\n    self.breakPositions = [];\n    self.nodeContextOverflowingDueToRepetitiveElements = null;\n\n    // ------- fill the column -------------\n    frame\n      .loopWithFrame((loopFrame) => {\n        while (nodeContext) {\n          // fill a single block\n          let pending = true;\n          self\n            .layoutNext(nodeContext, leadingEdge, breakAfter || null)\n            .then((nodeContextParam) => {\n              leadingEdge = false;\n              breakAfter = null;\n              if (\n                self.nodeContextOverflowingDueToRepetitiveElements &&\n                self.stopAtOverflow\n              ) {\n                self.pageBreakType = null;\n                nodeContext =\n                  self.nodeContextOverflowingDueToRepetitiveElements;\n                nodeContext.overflow = true;\n              } else {\n                nodeContext = nodeContextParam;\n              }\n              if (self.pageFloatLayoutContext.isInvalidated()) {\n                loopFrame.breakLoop();\n              } else if (self.pageBreakType) {\n                // explicit page break\n                loopFrame.breakLoop(); // Loop end\n              } else if (nodeContext && self.stopByOverflow(nodeContext)) {\n                // overflow (implicit page break): back up and find a\n                // page break\n                overflownNodeContext = nodeContext;\n                const bp = self.findAcceptableBreakPosition();\n                nodeContext = bp.nodeContext;\n                if (bp.breakPosition) {\n                  bp.breakPosition.breakPositionChosen(self);\n                }\n                loopFrame.breakLoop(); // Loop end\n              } else {\n                if (pending) {\n                  // Sync case\n                  pending = false;\n                } else {\n                  // Async case\n                  loopFrame.continueLoop();\n                }\n              }\n            });\n          if (pending) {\n            // Async case and loop end\n            pending = false;\n            return;\n          }\n        }\n\n        // Sync case\n        self.computedBlockSize += self.getOffsetByRepetitiveElements();\n        loopFrame.breakLoop();\n      })\n      .then(() => {\n        frame.finish({ nodeContext, overflownNodeContext });\n      });\n    return frame.result();\n  }\n\n  /**\n   * Re-layout already laid-out chunks. Return the position of the last flow if\n   * there is an overflow.\n   * TODO: deal with chunks that did not fit at all.\n   * @return holding end position.\n   */\n  redoLayout(): Task.Result<Vtree.ChunkPosition> {\n    const chunkPositions = this.chunkPositions;\n    let last: Node = this.element.lastChild;\n    while (last != this.last) {\n      const prev = last.previousSibling;\n      if (\n        !(\n          this.element === last.parentNode &&\n          (this.layoutContext as Vgen.ViewFactory).isPseudoelement(last)\n        )\n      ) {\n        this.element.removeChild(last);\n      }\n      last = prev;\n    }\n    this.killFloats();\n    this.init();\n    const self = this;\n    const frame: Task.Frame<Vtree.ChunkPosition> = Task.newFrame(\"redoLayout\");\n    let i = 0;\n    let res: Vtree.ChunkPosition = null;\n    let leadingEdge = true;\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (i < chunkPositions.length) {\n          const chunkPosition = chunkPositions[i++];\n          self.layout(chunkPosition, leadingEdge).then((pos) => {\n            leadingEdge = false;\n            if (pos) {\n              res = pos;\n              loopFrame.breakLoop();\n            } else {\n              loopFrame.continueLoop();\n            }\n          });\n          return;\n        }\n        loopFrame.breakLoop();\n      })\n      .then(() => {\n        frame.finish(res);\n      });\n    return frame.result();\n  }\n\n  saveDistanceToBlockEndFloats() {\n    const blockStartEdgeOfBlockEndFloats = this.pageFloatLayoutContext.getBlockStartEdgeOfBlockEndFloats();\n    if (\n      blockStartEdgeOfBlockEndFloats > 0 &&\n      isFinite(blockStartEdgeOfBlockEndFloats)\n    ) {\n      this.blockDistanceToBlockEndFloats =\n        this.getBoxDir() *\n        (blockStartEdgeOfBlockEndFloats -\n          this.beforeEdge -\n          this.computedBlockSize);\n    }\n  }\n\n  collectElementsOffset(): RepetitiveElement.ElementsOffset[] {\n    const repetitiveElements: RepetitiveElement.ElementsOffset[] = [];\n    for (let current: Column = this; current; current = current.pseudoParent) {\n      current.fragmentLayoutConstraints.forEach((constraint) => {\n        if (\n          RepetitiveElement.isInstanceOfRepetitiveElementsOwnerLayoutConstraint(\n            constraint,\n          )\n        ) {\n          const repetitiveElement = constraint.getRepetitiveElements();\n          repetitiveElements.push(repetitiveElement);\n        }\n        if (\n          Selectors.isInstanceOfAfterIfContinuesLayoutConstraint(constraint)\n        ) {\n          const repetitiveElement = constraint.getRepetitiveElements();\n          repetitiveElements.push(repetitiveElement);\n        }\n        if (Table.isInstanceOfTableRowLayoutConstraint(constraint)) {\n          constraint\n            .getElementsOffsetsForTableCell(this)\n            .forEach((repetitiveElement) => {\n              repetitiveElements.push(repetitiveElement);\n            });\n        }\n      });\n    }\n    return repetitiveElements;\n  }\n}\n\n/**\n * Represents a \"pseudo\"-column nested inside a real column.\n * This class is created to handle parallel fragmented flows (e.g. table columns\n * in a single table row). A pseudo-column behaves in the same way as the\n * original column, sharing its properties. Property changes on the\n * pseudo-column are not propagated to the original column. The LayoutContext of\n * the original column is also cloned and used by the pseudo-column, not to\n * propagate state changes of the LayoutContext caused by the pseudo-column.\n * @param column The original (parent) column\n * @param viewRoot Root element for the pseudo-column, i.e., the root of the\n *     fragmented flow.\n * @param parentNodeContext A NodeContext generating this PseudoColumn\n */\nexport class PseudoColumn {\n  startNodeContexts: Vtree.NodeContext[] = [];\n  private column: Layout.Column;\n  constructor(\n    column: Layout.Column,\n    viewRoot: Element,\n    parentNodeContext: Vtree.NodeContext,\n  ) {\n    this.column = Object.create(column) as Layout.Column;\n    this.column.element = viewRoot;\n    this.column.layoutContext = column.layoutContext.clone();\n    this.column.stopAtOverflow = false;\n    this.column.flowRootFormattingContext = parentNodeContext.formattingContext;\n    this.column.pseudoParent = column;\n    const parentClonedPaddingBorder = this.column.calculateClonedPaddingBorder(\n      parentNodeContext,\n    );\n    this.column.footnoteEdge =\n      this.column.footnoteEdge - parentClonedPaddingBorder;\n    const pseudoColumn = this;\n    this.column.openAllViews = function(position) {\n      return Column.prototype.openAllViews\n        .call(this, position)\n        .thenAsync((result) => {\n          pseudoColumn.startNodeContexts.push(result.copy());\n          return Task.newResult(result);\n        });\n    };\n  }\n  /**\n   * @param chunkPosition starting position.\n   * @return holding end position.\n   */\n  layout(\n    chunkPosition: Vtree.ChunkPosition,\n    leadingEdge: boolean,\n  ): Task.Result<Vtree.ChunkPosition> {\n    return this.column.layout(chunkPosition, leadingEdge);\n  }\n  findAcceptableBreakPosition(\n    allowBreakAtStartPosition: boolean,\n  ): Layout.BreakPositionAndNodeContext {\n    const p = this.column.findAcceptableBreakPosition();\n    if (allowBreakAtStartPosition) {\n      const startNodeContext = this.startNodeContexts[0].copy();\n      const bp = new BreakPosition.EdgeBreakPosition(\n        startNodeContext,\n        null,\n        startNodeContext.overflow,\n        0,\n      );\n      bp.findAcceptableBreak(this.column, 0);\n      if (!p.nodeContext) {\n        return { breakPosition: bp, nodeContext: startNodeContext };\n      }\n    }\n    return p;\n  }\n  /**\n   * @return holing true\n   */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean> {\n    return this.column.finishBreak(nodeContext, forceRemoveSelf, endOfColumn);\n  }\n  doFinishBreakOfFragmentLayoutConstraints(positionAfter: Vtree.NodeContext) {\n    this.column.doFinishBreakOfFragmentLayoutConstraints(positionAfter);\n  }\n  isStartNodeContext(nodeContext: Vtree.NodeContext): boolean {\n    const startNodeContext = this.startNodeContexts[0];\n    return (\n      startNodeContext.viewNode === nodeContext.viewNode &&\n      startNodeContext.after === nodeContext.after &&\n      startNodeContext.offsetInNode === nodeContext.offsetInNode\n    );\n  }\n  isLastAfterNodeContext(nodeContext: Vtree.NodeContext): boolean {\n    return VtreeImpl.isSameNodePosition(\n      nodeContext.toNodePosition(),\n      this.column.lastAfterPosition,\n    );\n  }\n  getColumnElement(): Element {\n    return this.column.element;\n  }\n  getColumn(): Layout.Column {\n    return this.column;\n  }\n}\n\nexport const firstCharPattern = /^[^A-Za-z0-9_\\u009E\\u009F\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02AF\\u037B-\\u037D\\u0386\\u0388-\\u0482\\u048A-\\u0527]*([A-Za-z0-9_\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02AF\\u037B-\\u037D\\u0386\\u0388-\\u0482\\u048A-\\u0527][^A-Za-z0-9_\\u009E\\u009F\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02AF\\u037B-\\u037D\\u0386\\u0388-\\u0482\\u048A-\\u0527]*)?/;\n\nexport type SinglePageFloatLayoutResult = Layout.SinglePageFloatLayoutResult;\n\nexport function fixJustificationOnHyphen(\n  nodeContext: Vtree.NodeContext,\n  insertAfter: boolean,\n  node: Node,\n  insertionPoint: Node,\n): void {\n  if (Base.checkSoftWrapOpportunityAfterHyphenBug(document.body)) {\n    const hyphenChar = resolveHyphenateCharacter(nodeContext);\n    const prevSibling = insertAfter ? node : node.previousSibling;\n    const prevText = prevSibling ? prevSibling.textContent : \"\";\n    if (prevText.charAt(prevText.length - 1) === hyphenChar) {\n      const doc = node.ownerDocument;\n      const parent = node.parentNode;\n      if (Base.checkSoftWrapOpportunityByWbrBug(document.body)) {\n        // For IE\n        parent.insertBefore(doc.createTextNode(\" \"), insertionPoint);\n      } else {\n        // For Edge\n        parent.insertBefore(doc.createElement(\"wbr\"), insertionPoint);\n      }\n    }\n  }\n}\n\n/**\n * breaking point resolver for Text Node.\n */\nexport class TextNodeBreaker implements Layout.TextNodeBreaker {\n  breakTextNode(\n    textNode: Text,\n    nodeContext: Vtree.NodeContext,\n    low: number,\n    checkPoints: Vtree.NodeContext[],\n    checkpointIndex: number,\n    force: boolean,\n  ): Vtree.NodeContext {\n    if (nodeContext.after) {\n      nodeContext.offsetInNode = textNode.length;\n    } else {\n      // Character with index low is the last one that fits.\n      let viewIndex = low - nodeContext.boxOffset;\n      const text = textNode.data;\n      if (text.charCodeAt(viewIndex) == 173) {\n        viewIndex = this.breakAfterSoftHyphen(\n          textNode,\n          text,\n          viewIndex,\n          nodeContext,\n        );\n      } else {\n        viewIndex = this.breakAfterOtherCharacter(\n          textNode,\n          text,\n          viewIndex,\n          nodeContext,\n        );\n      }\n      if (viewIndex > 0) {\n        nodeContext = this.updateNodeContext(nodeContext, viewIndex, textNode);\n      }\n    }\n    return nodeContext;\n  }\n\n  breakAfterSoftHyphen(\n    textNode: Text,\n    text: string,\n    viewIndex: number,\n    nodeContext: Vtree.NodeContext,\n  ): number {\n    // convert trailing soft hyphen to a real hyphen\n    textNode.replaceData(\n      viewIndex,\n      text.length - viewIndex,\n      !nodeContext.breakWord ? resolveHyphenateCharacter(nodeContext) : \"\",\n    );\n    return viewIndex + 1;\n  }\n\n  breakAfterOtherCharacter(\n    textNode: Text,\n    text: string,\n    viewIndex: number,\n    nodeContext: Vtree.NodeContext,\n  ): number {\n    // keep the trailing character (it may be a space or not)\n    const ch0 = text.charAt(viewIndex);\n    viewIndex++;\n    const ch1 = text.charAt(viewIndex);\n\n    // If automatic hyphen was inserted here, add a real hyphen.\n    textNode.replaceData(\n      viewIndex,\n      text.length - viewIndex,\n      !nodeContext.breakWord && Base.isLetter(ch0) && Base.isLetter(ch1)\n        ? resolveHyphenateCharacter(nodeContext)\n        : \"\",\n    );\n    return viewIndex;\n  }\n\n  updateNodeContext(\n    nodeContext: Vtree.NodeContext,\n    viewIndex: number,\n    textNode: Text,\n  ): Vtree.NodeContext {\n    nodeContext = nodeContext.modify();\n    nodeContext.offsetInNode += viewIndex;\n    nodeContext.breakBefore = null;\n    return nodeContext;\n  }\n\n  static instance: TextNodeBreaker;\n}\nTextNodeBreaker.instance = new TextNodeBreaker();\n\nexport function resolveHyphenateCharacter(\n  nodeContext: Vtree.NodeContext,\n): string {\n  return (\n    nodeContext.hyphenateCharacter ||\n    (nodeContext.parent && nodeContext.parent.hyphenateCharacter) ||\n    \"-\"\n  );\n}\n\nexport class ColumnLayoutRetryer extends LayoutRetryers.AbstractLayoutRetryer {\n  breakAfter: string | null;\n  private initialPageBreakType: string | null = null;\n  initialComputedBlockSize: number = 0;\n  private initialOverflown: boolean = false;\n  context: { overflownNodeContext: Vtree.NodeContext } = {\n    overflownNodeContext: null,\n  };\n\n  constructor(\n    public readonly leadingEdge: boolean,\n    breakAfter?: string | null,\n  ) {\n    super();\n    this.breakAfter = breakAfter || null;\n  }\n\n  /**\n   * @override\n   */\n  resolveLayoutMode(nodeContext: Vtree.NodeContext): Layout.LayoutMode {\n    return new DefaultLayoutMode(\n      this.leadingEdge,\n      this.breakAfter,\n      this.context,\n    );\n  }\n\n  /**\n   * @override\n   */\n  prepareLayout(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    column.fragmentLayoutConstraints = [];\n    if (!column.pseudoParent) {\n      Shared.clearRepetitiveElementsCache();\n    }\n  }\n\n  /**\n   * @override\n   */\n  clearNodes(initialPosition: Vtree.NodeContext) {\n    super.clearNodes(initialPosition);\n    let nodeContext = initialPosition;\n    while (nodeContext) {\n      const viewNode = nodeContext.viewNode;\n      if (viewNode) {\n        LayoutHelper.removeFollowingSiblings(viewNode.parentNode, viewNode);\n      }\n      nodeContext = nodeContext.parent;\n    }\n  }\n\n  /**\n   * @override\n   */\n  saveState(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    super.saveState(nodeContext, column);\n    this.initialPageBreakType = column.pageBreakType;\n    this.initialComputedBlockSize = column.computedBlockSize;\n    this.initialOverflown = column.overflown;\n  }\n\n  /**\n   * @override\n   */\n  restoreState(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    super.restoreState(nodeContext, column);\n    column.pageBreakType = this.initialPageBreakType;\n    column.computedBlockSize = this.initialComputedBlockSize;\n    column.overflown = this.initialOverflown;\n  }\n}\n\nexport class DefaultLayoutMode implements Layout.LayoutMode {\n  constructor(\n    public readonly leadingEdge: boolean,\n    public readonly breakAfter: string | null,\n    public readonly context: { overflownNodeContext: Vtree.NodeContext },\n  ) {}\n\n  /**\n   * @override\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\n      \"DefaultLayoutMode.doLayout\",\n    );\n\n    processAfterIfContinuesOfAncestors(nodeContext, column).then(() => {\n      column\n        .doLayout(nodeContext, this.leadingEdge, this.breakAfter)\n        .then((result) => {\n          this.context.overflownNodeContext = result.overflownNodeContext;\n          frame.finish(result.nodeContext);\n        });\n    });\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  accept(nodeContext: Vtree.NodeContext, column: Layout.Column): boolean {\n    if (column.pageFloatLayoutContext.isInvalidated() || column.pageBreakType) {\n      return true;\n    }\n    if (column.fragmentLayoutConstraints.length <= 0) {\n      return true;\n    }\n    return column.fragmentLayoutConstraints.every((constraint) =>\n      constraint.allowLayout(\n        nodeContext,\n        this.context.overflownNodeContext,\n        column,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  postLayout(\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: Layout.Column,\n    accepted: boolean,\n  ): boolean {\n    if (!accepted) {\n      const hasNextCandidate = column.fragmentLayoutConstraints.some(\n        (constraint) => constraint.nextCandidate(positionAfter),\n      );\n\n      // If there is no next candidate, we accept the current layout trial.\n      // Later Column#doFinishBreak decides whether the overflowing content\n      // should be placed as is or be deferred to the next column,\n      // depending on the value of Column#forceNonfitting.\n      accepted = !hasNextCandidate;\n    }\n    column.fragmentLayoutConstraints.forEach((constraint) => {\n      constraint.postLayout(accepted, positionAfter, initialPosition, column);\n    });\n    return accepted;\n  }\n}\n\nexport class PageFloatArea extends Column implements Layout.PageFloatArea {\n  private rootViewNodes: Element[] = [];\n  private floatMargins: GeometryUtil.Insets[] = [];\n  adjustContentRelativeSize: boolean = true;\n\n  constructor(\n    public readonly floatSide: string,\n    element: Element,\n    layoutContext: Vtree.LayoutContext,\n    clientLayout: Vtree.ClientLayout,\n    layoutConstraint: LayoutConstraint,\n    pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    public readonly parentContainer: Vtree.Container,\n  ) {\n    super(\n      element,\n      layoutContext,\n      clientLayout,\n      layoutConstraint,\n      pageFloatLayoutContext,\n    );\n  }\n\n  /**\n   * @override\n   */\n  openAllViews(position: Vtree.NodePosition): Task.Result<Vtree.NodeContext> {\n    return super.openAllViews(position).thenAsync((nodeContext) => {\n      if (nodeContext) {\n        this.fixFloatSizeAndPosition(nodeContext);\n      }\n      return Task.newResult(nodeContext);\n    });\n  }\n\n  convertPercentageSizesToPx(target: Element) {\n    const containingBlockRect = this.parentContainer.getPaddingRect();\n    const refWidth = containingBlockRect.x2 - containingBlockRect.x1;\n    const refHeight = containingBlockRect.y2 - containingBlockRect.y1;\n\n    function convertPercentageToPx(props: string[], refValue: number) {\n      props.forEach((propName) => {\n        const valueString = Base.getCSSProperty(target, propName);\n        if (valueString && valueString.charAt(valueString.length - 1) === \"%\") {\n          const percentageValue = parseFloat(valueString);\n          const value = (refValue * percentageValue) / 100;\n          Base.setCSSProperty(target, propName, `${value}px`);\n        }\n      });\n    }\n    convertPercentageToPx([\"width\", \"max-width\", \"min-width\"], refWidth);\n    convertPercentageToPx([\"height\", \"max-height\", \"min-height\"], refHeight);\n    convertPercentageToPx(\n      [\n        \"margin-top\",\n        \"margin-right\",\n        \"margin-bottom\",\n        \"margin-left\",\n        \"padding-top\",\n        \"padding-right\",\n        \"padding-bottom\",\n        \"padding-left\",\n      ],\n      this.vertical ? refHeight : refWidth,\n    );\n    [\"margin-top\", \"margin-right\", \"margin-bottom\", \"margin-left\"].forEach(\n      (propName) => {\n        const value = Base.getCSSProperty(target, propName);\n        if (value === \"auto\") {\n          Base.setCSSProperty(target, propName, \"0\");\n        }\n      },\n    );\n  }\n\n  fixFloatSizeAndPosition(nodeContext: Vtree.NodeContext) {\n    while (nodeContext.parent) {\n      nodeContext = nodeContext.parent;\n    }\n    Asserts.assert(nodeContext.viewNode.nodeType === 1);\n    const rootViewNode = nodeContext.viewNode as Element;\n    this.rootViewNodes.push(rootViewNode);\n    if (this.adjustContentRelativeSize) {\n      this.convertPercentageSizesToPx(rootViewNode);\n    }\n    this.floatMargins.push(this.getComputedMargin(rootViewNode));\n    if (this.adjustContentRelativeSize) {\n      const floatSide = this.floatSide;\n      const isVertical = this.parentContainer.vertical;\n      if (isVertical) {\n        if (floatSide === \"block-end\" || floatSide === \"left\") {\n          const height = Base.getCSSProperty(rootViewNode, \"height\");\n          if (height !== \"\" && height !== \"auto\") {\n            Base.setCSSProperty(rootViewNode, \"margin-top\", \"auto\");\n          }\n        }\n      } else {\n        if (floatSide === \"block-end\" || floatSide === \"bottom\") {\n          const width = Base.getCSSProperty(rootViewNode, \"width\");\n          if (width !== \"\" && width !== \"auto\") {\n            Base.setCSSProperty(rootViewNode, \"margin-left\", \"auto\");\n          }\n        }\n      }\n    }\n  }\n\n  getContentInlineSize(): number {\n    return Math.max.apply(\n      null,\n      this.rootViewNodes.map((r, i) => {\n        const box = this.clientLayout.getElementClientRect(r);\n        const margin = this.floatMargins[i];\n        return this.vertical\n          ? margin.top + box.height + margin.bottom\n          : margin.left + box.width + margin.right;\n      }),\n    );\n  }\n}\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview RepetitiveElement - Elements repeated in every fragment\n * by repeat-on-break property.\n */\nimport * as Asserts from \"./asserts\";\nimport * as LayoutHelper from \"./layout-helper\";\nimport * as LayoutProcessor from \"./layout-processor\";\nimport * as LayoutRetryers from \"./layout-retryers\";\nimport * as LayoutUtil from \"./layout-util\";\nimport * as Plugin from \"./plugin\";\nimport * as Shared from \"./shared\";\nimport * as Task from \"./task\";\nimport * as VtreeImpl from \"./vtree\";\nimport * as Layout from \"./layout\";\nimport {\n  FormattingContextType,\n  FragmentLayoutConstraintType,\n  Layout as LayoutType,\n  RepetitiveElement,\n  Table,\n  Vtree,\n} from \"./types\";\n\nexport class RepetitiveElementsOwnerFormattingContext\n  implements RepetitiveElement.RepetitiveElementsOwnerFormattingContext {\n  formattingContextType: FormattingContextType = \"RepetitiveElementsOwner\";\n  isRoot: boolean = false;\n  repetitiveElements: RepetitiveElement.RepetitiveElements = null;\n\n  constructor(\n    public readonly parent: Vtree.FormattingContext,\n    public readonly rootSourceNode: Element,\n  ) {}\n\n  /**\n   * @override\n   */\n  getName(): string {\n    return \"Repetitive elements owner formatting context (RepetitiveElementsOwnerFormattingContext)\";\n  }\n\n  /**\n   * @override\n   */\n  isFirstTime(nodeContext: Vtree.NodeContext, firstTime: boolean): boolean {\n    return firstTime;\n  }\n\n  /**\n   * @override\n   */\n  getParent(): Vtree.FormattingContext {\n    return this.parent;\n  }\n\n  getRepetitiveElements(): RepetitiveElement.RepetitiveElements {\n    return this.repetitiveElements;\n  }\n\n  getRootViewNode(position: Vtree.NodeContext): Element | null {\n    const root = this.getRootNodeContext(position);\n    return root ? (root.viewNode as Element) : null;\n  }\n\n  getRootNodeContext(nodeContext: Vtree.NodeContext): Vtree.NodeContext | null {\n    do {\n      if (\n        !nodeContext.belongsTo(this) &&\n        nodeContext.sourceNode === this.rootSourceNode\n      ) {\n        return nodeContext;\n      }\n    } while ((nodeContext = nodeContext.parent));\n    return null;\n  }\n\n  initializeRepetitiveElements(vertical: boolean) {\n    if (this.repetitiveElements) {\n      return;\n    }\n    const found = Shared.repetitiveElementsCache.some((entry) => {\n      if (entry.root === this.rootSourceNode) {\n        this.repetitiveElements = entry.elements;\n        return true;\n      }\n      return false;\n    });\n    if (!found) {\n      this.repetitiveElements = new RepetitiveElements(\n        vertical,\n        this.rootSourceNode,\n      );\n      Shared.repetitiveElementsCache.push({\n        root: this.rootSourceNode,\n        elements: this.repetitiveElements,\n      });\n    }\n  }\n\n  /** @override */\n  saveState(): any {}\n\n  /** @override */\n  restoreState(state: any) {}\n}\n\nexport type ElementsOffset = RepetitiveElement.ElementsOffset;\n\nexport class RepetitiveElements\n  implements RepetitiveElement.RepetitiveElements {\n  private headerSourceNode: Element | null = null;\n  private footerSourceNode: Element | null = null;\n  private headerViewNode: Element | null = null;\n  private footerViewNode: Element | null = null;\n  private headerNodePosition: Vtree.NodePosition | null = null;\n  private footerNodePosition: Vtree.NodePosition | null = null;\n  private headerHeight: number = 0;\n  private footerHeight: number = 0;\n  isSkipHeader: boolean = false;\n  isSkipFooter: boolean = false;\n  enableSkippingFooter: boolean = true;\n  enableSkippingHeader: boolean = true;\n  doneInitialLayout: boolean = false;\n  firstContentSourceNode: Element | null = null;\n  lastContentSourceNode: Element | null = null;\n  private affectedNodeCache: {\n    nodeContext: Vtree.NodeContext;\n    result: boolean;\n  }[] = [];\n  private afterLastContentNodeCache: {\n    nodeContext: Vtree.NodeContext;\n    result: boolean;\n  }[] = [];\n  allowInsert: boolean = false;\n  allowInsertRepeatitiveElements: boolean;\n\n  constructor(\n    private readonly vertical: boolean,\n    public ownerSourceNode: Element,\n  ) {}\n\n  setHeaderNodeContext(nodeContext: Vtree.NodeContext) {\n    if (this.headerNodePosition) {\n      return; // use first one.\n    }\n    this.headerNodePosition = VtreeImpl.newNodePositionFromNodeContext(\n      nodeContext,\n      0,\n    );\n    this.headerSourceNode = nodeContext.sourceNode as Element;\n    this.headerViewNode = nodeContext.viewNode as Element;\n  }\n\n  setFooterNodeContext(nodeContext: Vtree.NodeContext) {\n    if (this.footerNodePosition) {\n      return; // use first one.\n    }\n    this.footerNodePosition = VtreeImpl.newNodePositionFromNodeContext(\n      nodeContext,\n      0,\n    );\n    this.footerSourceNode = nodeContext.sourceNode as Element;\n    this.footerViewNode = nodeContext.viewNode as Element;\n  }\n\n  updateHeight(column: LayoutType.Column) {\n    if (this.headerViewNode) {\n      this.headerHeight = LayoutHelper.getElementHeight(\n        this.headerViewNode,\n        column,\n        this.vertical,\n      );\n      this.headerViewNode = null;\n    }\n    if (this.footerViewNode) {\n      this.footerHeight = LayoutHelper.getElementHeight(\n        this.footerViewNode,\n        column,\n        this.vertical,\n      );\n      this.footerViewNode = null;\n    }\n  }\n\n  prepareLayoutFragment() {\n    this.isSkipHeader = this.isSkipFooter = false;\n    this.enableSkippingFooter = true;\n    this.enableSkippingHeader = true;\n  }\n\n  appendHeaderToFragment(\n    rootNodeContext: Vtree.NodeContext,\n    firstChild: Node | null,\n    column: LayoutType.Column,\n  ): Task.Result<boolean> {\n    if (!this.headerNodePosition || this.isSkipHeader) {\n      return Task.newResult(true);\n    }\n    return this.appendElementToFragment(\n      this.headerNodePosition,\n      rootNodeContext,\n      firstChild,\n      column,\n    );\n  }\n\n  appendFooterToFragment(\n    rootNodeContext: Vtree.NodeContext,\n    firstChild: Node | null,\n    column: LayoutType.Column,\n  ): Task.Result<boolean> {\n    if (!this.footerNodePosition || this.isSkipFooter) {\n      return Task.newResult(true);\n    }\n    return this.appendElementToFragment(\n      this.footerNodePosition,\n      rootNodeContext,\n      firstChild,\n      column,\n    );\n  }\n\n  /**\n   * @return\n   */\n  appendElementToFragment(\n    nodePosition: Vtree.NodePosition,\n    rootNodeContext: Vtree.NodeContext,\n    firstChild: Node | null,\n    column: LayoutType.Column,\n  ): Task.Result<boolean> {\n    const doc = rootNodeContext.viewNode.ownerDocument;\n    const rootViewNode = rootNodeContext.viewNode as Element;\n    const viewRoot = doc.createElement(\"div\");\n    rootViewNode.appendChild(viewRoot);\n    const pseudoColumn = new Layout.PseudoColumn(\n      column,\n      viewRoot,\n      rootNodeContext,\n    );\n    const initialPageBreakType = pseudoColumn.getColumn().pageBreakType;\n    pseudoColumn.getColumn().pageBreakType = null;\n    this.allowInsertRepeatitiveElements = true;\n    return pseudoColumn\n      .layout(new VtreeImpl.ChunkPosition(nodePosition), true)\n      .thenAsync(() => {\n        this.allowInsertRepeatitiveElements = false;\n        rootViewNode.removeChild(viewRoot);\n        this.moveChildren(viewRoot, rootViewNode, firstChild);\n        pseudoColumn.getColumn().pageBreakType = initialPageBreakType;\n        return Task.newResult(true);\n      });\n  }\n\n  moveChildren(from: Element, to: Element, firstChild: Node | null) {\n    if (!to) {\n      return;\n    }\n    while (from.firstChild) {\n      const child = from.firstChild;\n      from.removeChild(child);\n      (child as Element).setAttribute(VtreeImpl.SPECIAL_ATTR, \"1\");\n      if (firstChild) {\n        to.insertBefore(child, firstChild);\n      } else {\n        to.appendChild(child);\n      }\n    }\n  }\n\n  /** @override */\n  calculateOffset(nodeContext: Vtree.NodeContext): number {\n    let offset = 0;\n    if (nodeContext && !this.affectTo(nodeContext)) {\n      return offset;\n    }\n    if (\n      !this.isSkipFooter ||\n      (nodeContext && this.isAfterLastContent(nodeContext))\n    ) {\n      offset += this.footerHeight;\n    }\n    if (!this.isSkipHeader) {\n      offset += this.headerHeight;\n    }\n    return offset;\n  }\n\n  /** @override */\n  calculateMinimumOffset(nodeContext: Vtree.NodeContext): number {\n    let offset = 0;\n    if (nodeContext && !this.affectTo(nodeContext)) {\n      return offset;\n    }\n    if (nodeContext && this.isAfterLastContent(nodeContext)) {\n      offset += this.footerHeight;\n    }\n    if (!this.enableSkippingHeader) {\n      offset += this.headerHeight;\n    }\n    return offset;\n  }\n\n  isAfterLastContent(nodeContext: Vtree.NodeContext): boolean {\n    return this.findResultFromCache(\n      nodeContext,\n      this.afterLastContentNodeCache,\n      (nc) =>\n        this.isAfterNodeContextOf(\n          this.lastContentSourceNode as Element,\n          nodeContext,\n          false,\n        ),\n    );\n  }\n\n  private affectTo(nodeContext: Vtree.NodeContext): boolean {\n    return this.findResultFromCache(nodeContext, this.affectedNodeCache, (nc) =>\n      this.isAfterNodeContextOf(this.ownerSourceNode, nodeContext, true),\n    );\n  }\n\n  private findResultFromCache(\n    nodeContext: Vtree.NodeContext,\n    cache: { nodeContext: Vtree.NodeContext; result: boolean }[],\n    calculator: (p1: Vtree.NodeContext) => boolean,\n  ): boolean {\n    const cacheEntry = cache.filter(\n      (cache) =>\n        cache.nodeContext.sourceNode === nodeContext.sourceNode &&\n        cache.nodeContext.after === nodeContext.after,\n    );\n    if (cacheEntry.length > 0) {\n      return cacheEntry[0].result;\n    } else {\n      const result = calculator(nodeContext);\n      cache.push({ nodeContext, result });\n      return result;\n    }\n  }\n\n  private isAfterNodeContextOf(\n    node: Element,\n    nodeContext: Vtree.NodeContext,\n    includeChildren: boolean,\n  ): boolean {\n    const parentsOfNode = [];\n    for (let n: Node | null = node; n; n = n.parentNode) {\n      if (nodeContext.sourceNode === n) {\n        return nodeContext.after;\n      } else {\n        parentsOfNode.push(n);\n      }\n    }\n    for (\n      let currentParent: Node | null = nodeContext.sourceNode;\n      currentParent;\n      currentParent = currentParent.parentNode\n    ) {\n      const index = parentsOfNode.indexOf(currentParent);\n      if (index >= 0) {\n        return includeChildren ? index === 0 : false;\n      } else {\n        for (\n          let current: Element | null = currentParent as Element;\n          current;\n          current = current.previousElementSibling\n        ) {\n          if (parentsOfNode.includes(current)) {\n            return true;\n          }\n        }\n      }\n    }\n    return nodeContext.after;\n  }\n\n  isFirstContentNode(nodeContext: Vtree.NodeContext): boolean {\n    return (\n      nodeContext && this.firstContentSourceNode === nodeContext.sourceNode\n    );\n  }\n\n  isEnableToUpdateState(): boolean {\n    if (\n      (!this.isSkipFooter &&\n        this.enableSkippingFooter &&\n        this.footerNodePosition) ||\n      (!this.isSkipHeader &&\n        this.enableSkippingHeader &&\n        this.headerNodePosition)\n    ) {\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  updateState() {\n    if (\n      !this.isSkipFooter &&\n      this.enableSkippingFooter &&\n      this.footerNodePosition\n    ) {\n      this.isSkipFooter = true;\n    } else if (\n      !this.isSkipHeader &&\n      this.enableSkippingHeader &&\n      this.headerNodePosition\n    ) {\n      this.isSkipHeader = true;\n    }\n  }\n\n  preventSkippingHeader() {\n    this.isSkipHeader = false;\n    this.enableSkippingHeader = false;\n  }\n\n  preventSkippingFooter() {\n    this.isSkipFooter = false;\n    this.enableSkippingFooter = false;\n  }\n\n  isHeaderRegistered(): boolean {\n    return !!this.headerNodePosition;\n  }\n\n  isFooterRegistered(): boolean {\n    return !!this.footerNodePosition;\n  }\n\n  isHeaderSourceNode(node: Node): boolean {\n    return this.headerSourceNode === node;\n  }\n\n  isFooterSourceNode(node: Node): boolean {\n    return this.footerSourceNode === node;\n  }\n}\n\n/**\n * @abstract\n */\nexport abstract class LayoutEntireBlock implements LayoutType.LayoutMode {\n  constructor(\n    public formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n  ) {}\n\n  /**\n   * @override\n   */\n  abstract doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext>;\n\n  /**\n   * @override\n   */\n  accept(nodeContext: Vtree.NodeContext, column: LayoutType.Column): boolean {\n    return !!nodeContext;\n  }\n\n  /**\n   * @override\n   */\n  postLayout(\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: LayoutType.Column,\n    accepted: boolean,\n  ): boolean {\n    const repetitiveElements = this.formattingContext.getRepetitiveElements();\n    if (repetitiveElements) {\n      Asserts.assert(column.clientLayout);\n      if (!repetitiveElements.doneInitialLayout) {\n        repetitiveElements.updateHeight(column);\n        repetitiveElements.doneInitialLayout = true;\n      }\n    }\n    return accepted;\n  }\n}\n\n/**\n * @abstract\n */\nexport abstract class LayoutFragmentedBlock implements LayoutType.LayoutMode {\n  constructor(\n    public formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n  ) {}\n\n  /**\n   * @override\n   */\n  abstract doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext>;\n\n  /**\n   * @override\n   */\n  accept(nodeContext: Vtree.NodeContext, column: LayoutType.Column): boolean {\n    return true;\n  }\n\n  /**\n   * @override\n   */\n  postLayout(\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: LayoutType.Column,\n    accepted: boolean,\n  ): boolean {\n    return accepted;\n  }\n}\n\nexport class LayoutEntireOwnerBlock extends LayoutEntireBlock {\n  constructor(\n    formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n    public readonly processor: RepetitiveElementsOwnerLayoutProcessor,\n  ) {\n    super(formattingContext);\n  }\n\n  /**\n   * @override\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    // FIXME: LayoutEntireBlock.prototype.doLayout is undefined because it's abstract method.\n    //        Probably, removing this call is ok.\n    // LayoutEntireBlock.prototype.doLayout.call(this, nodeContext, column);\n    return this.processor.doInitialLayout(nodeContext, column);\n  }\n\n  /**\n   * @override\n   */\n  accept(nodeContext: Vtree.NodeContext, column: LayoutType.Column): boolean {\n    return false;\n  }\n}\n\nexport class LayoutFragmentedOwnerBlock extends LayoutFragmentedBlock {\n  constructor(\n    formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n    public readonly processor: RepetitiveElementsOwnerLayoutProcessor,\n  ) {\n    super(formattingContext);\n  }\n\n  /**\n   * @override\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    if (!nodeContext.belongsTo(this.formattingContext) && !nodeContext.after) {\n      column.fragmentLayoutConstraints.unshift(\n        new RepetitiveElementsOwnerLayoutConstraint(nodeContext),\n      );\n    }\n    return this.processor.doLayout(nodeContext, column);\n  }\n}\n\nexport class RepetitiveElementsOwnerLayoutConstraint\n  implements RepetitiveElement.RepetitiveElementsOwnerLayoutConstraint {\n  flagmentLayoutConstraintType: FragmentLayoutConstraintType =\n    \"RepetitiveElementsOwner\";\n  nodeContext: Vtree.NodeContext;\n\n  constructor(nodeContext: Vtree.NodeContext) {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      nodeContext.formattingContext,\n    );\n    this.nodeContext = formattingContext.getRootNodeContext(nodeContext);\n  }\n\n  /** @override */\n  allowLayout(\n    nodeContext: Vtree.NodeContext,\n    overflownNodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): boolean {\n    const repetitiveElements = this.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return true;\n    }\n    if (LayoutHelper.isOrphan(this.nodeContext.viewNode)) {\n      return true;\n    }\n    if (!repetitiveElements.isEnableToUpdateState()) {\n      return true;\n    }\n    if (\n      (overflownNodeContext && !nodeContext) ||\n      (nodeContext && nodeContext.overflow)\n    ) {\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /** @override */\n  nextCandidate(nodeContext: Vtree.NodeContext): boolean {\n    const repetitiveElements = this.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return false;\n    }\n    if (repetitiveElements.isEnableToUpdateState()) {\n      repetitiveElements.updateState();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  /** @override */\n  postLayout(\n    allowed: boolean,\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ) {\n    const repetitiveElements = this.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return;\n    }\n    if (allowed) {\n      if (column.stopAtOverflow) {\n        if (\n          positionAfter == null ||\n          repetitiveElements.isAfterLastContent(positionAfter)\n        ) {\n          repetitiveElements.preventSkippingFooter();\n        }\n      }\n    }\n  }\n\n  /** @override */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<boolean> {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    const repetitiveElements = this.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return Task.newResult(true);\n    }\n    const rootNodeContext = this.nodeContext;\n    return appendHeader(formattingContext, rootNodeContext, column).thenAsync(\n      () =>\n        appendFooter(formattingContext, rootNodeContext, column).thenAsync(\n          () => {\n            repetitiveElements.prepareLayoutFragment();\n            return Task.newResult(true);\n          },\n        ),\n    );\n  }\n\n  getRepetitiveElements(): RepetitiveElement.RepetitiveElements {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    return formattingContext.getRepetitiveElements();\n  }\n\n  /** @override */\n  equalsTo(constraint: LayoutType.FragmentLayoutConstraint): boolean {\n    if (!(constraint instanceof RepetitiveElementsOwnerLayoutConstraint)) {\n      return false;\n    }\n    return (\n      getRepetitiveElementsOwnerFormattingContext(\n        this.nodeContext.formattingContext,\n      ) ===\n      getRepetitiveElementsOwnerFormattingContext(\n        constraint.nodeContext.formattingContext,\n      )\n    );\n  }\n\n  /** @override */\n  getPriorityOfFinishBreak(): number {\n    return 10;\n  }\n}\n\nexport class RepetitiveElementsOwnerLayoutRetryer extends LayoutRetryers.AbstractLayoutRetryer {\n  constructor(\n    public readonly formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n    private readonly processor: RepetitiveElementsOwnerLayoutProcessor,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  resolveLayoutMode(nodeContext: Vtree.NodeContext): LayoutType.LayoutMode {\n    const repetitiveElements = this.formattingContext.getRepetitiveElements();\n    if (\n      !nodeContext.belongsTo(this.formattingContext) &&\n      !repetitiveElements.doneInitialLayout\n    ) {\n      return new LayoutEntireOwnerBlock(this.formattingContext, this.processor);\n    } else {\n      if (\n        !nodeContext.belongsTo(this.formattingContext) &&\n        !nodeContext.after\n      ) {\n        if (repetitiveElements) {\n          repetitiveElements.preventSkippingHeader();\n        }\n      }\n      return new LayoutFragmentedOwnerBlock(\n        this.formattingContext,\n        this.processor,\n      );\n    }\n  }\n}\n\nexport class EntireBlockLayoutStrategy extends LayoutUtil.EdgeSkipper {\n  constructor(\n    public readonly formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n    public readonly column: LayoutType.Column,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  startNonInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    const formattingContext = this.formattingContext;\n    const nodeContext = state.nodeContext;\n    const repetitiveElements = formattingContext.getRepetitiveElements();\n    if (\n      nodeContext.parent &&\n      formattingContext.rootSourceNode === nodeContext.parent.sourceNode\n    ) {\n      switch (nodeContext.repeatOnBreak) {\n        case \"header\":\n          if (!repetitiveElements.isHeaderRegistered()) {\n            repetitiveElements.setHeaderNodeContext(nodeContext);\n            return Task.newResult(true);\n          } else {\n            nodeContext.repeatOnBreak = \"none\";\n          }\n          break;\n        case \"footer\":\n          if (!repetitiveElements.isFooterRegistered()) {\n            repetitiveElements.setFooterNodeContext(nodeContext);\n            return Task.newResult(true);\n          } else {\n            nodeContext.repeatOnBreak = \"none\";\n          }\n          break;\n      }\n      if (!repetitiveElements.firstContentSourceNode) {\n        repetitiveElements.firstContentSourceNode = nodeContext.sourceNode as Element;\n      }\n    }\n    return LayoutUtil.EdgeSkipper.prototype.startNonInlineElementNode.call(\n      this,\n      state,\n    );\n  }\n\n  /**\n   * @override\n   */\n  afterNonInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    const formattingContext = this.formattingContext;\n    const nodeContext = state.nodeContext;\n    if (nodeContext.sourceNode === formattingContext.rootSourceNode) {\n      formattingContext.getRepetitiveElements().lastContentSourceNode =\n        state.lastAfterNodeContext &&\n        (state.lastAfterNodeContext.sourceNode as Element);\n      state.break = true;\n    }\n    if (\n      nodeContext.repeatOnBreak === \"header\" ||\n      nodeContext.repeatOnBreak === \"footer\"\n    ) {\n      return Task.newResult(true);\n    } else {\n      return LayoutUtil.EdgeSkipper.prototype.afterNonInlineElementNode.call(\n        this,\n        state,\n      );\n    }\n  }\n}\n\nexport class FragmentedBlockLayoutStrategy extends LayoutUtil.EdgeSkipper {\n  constructor(\n    public readonly formattingContext: RepetitiveElementsOwnerFormattingContext,\n    public readonly column: LayoutType.Column,\n  ) {\n    super();\n  }\n}\n\nexport class RepetitiveElementsOwnerLayoutProcessor\n  extends LayoutProcessor.BlockLayoutProcessor\n  implements LayoutProcessor.LayoutProcessor {\n  layout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n    leadingEdge: boolean,\n  ): Task.Result<Vtree.NodeContext> {\n    if (column.isFloatNodeContext(nodeContext)) {\n      return column.layoutFloatOrFootnote(nodeContext);\n    }\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const rootViewNode = formattingContext.getRootViewNode(nodeContext);\n    if (!rootViewNode) {\n      return column.buildDeepElementView(nodeContext);\n    } else {\n      if (leadingEdge) {\n        appendHeaderToAncestors(nodeContext.parent, column);\n      }\n      if (!nodeContext.belongsTo(formattingContext)) {\n        return new RepetitiveElementsOwnerLayoutRetryer(\n          formattingContext,\n          this,\n        ).layout(nodeContext, column);\n      } else {\n        return LayoutProcessor.BlockLayoutProcessor.prototype.layout.call(\n          this,\n          nodeContext,\n          column,\n          leadingEdge,\n        );\n      }\n    }\n  }\n\n  startNonInlineElementNode(nodeContext: Vtree.NodeContext): boolean {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContextOrNull(\n      nodeContext,\n    );\n    const repetitiveElements = formattingContext.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return false;\n    }\n    if (\n      !repetitiveElements.allowInsertRepeatitiveElements &&\n      (repetitiveElements.isHeaderSourceNode(nodeContext.sourceNode) ||\n        repetitiveElements.isFooterSourceNode(nodeContext.sourceNode))\n    ) {\n      nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n    }\n    return false;\n  }\n\n  doInitialLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const frame = Task.newFrame<Vtree.NodeContext>(\n      \"BlockLayoutProcessor.doInitialLayout\",\n    );\n    this.layoutEntireBlock(nodeContext, column).thenFinish(frame);\n    return frame.result();\n  }\n\n  private layoutEntireBlock(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const strategy = new EntireBlockLayoutStrategy(formattingContext, column);\n    const iterator = new LayoutUtil.LayoutIterator(\n      strategy,\n      column.layoutContext,\n    );\n    return iterator.iterate(nodeContext);\n  }\n\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: LayoutType.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getRepetitiveElementsOwnerFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"doLayout\");\n    const cont = column.layoutContext.nextInTree(nodeContext, false);\n    Layout.processAfterIfContinues(cont, column).then((resNodeContext) => {\n      let nextNodeContext = resNodeContext;\n      frame\n        .loopWithFrame((loopFrame) => {\n          while (nextNodeContext) {\n            let pending = true;\n            column\n              .layoutNext(nextNodeContext, false)\n              .then((nodeContextParam) => {\n                nextNodeContext = nodeContextParam;\n                if (column.pageFloatLayoutContext.isInvalidated()) {\n                  loopFrame.breakLoop();\n                } else if (column.pageBreakType) {\n                  loopFrame.breakLoop(); // Loop end\n                } else if (\n                  nextNodeContext &&\n                  column.stopByOverflow(nextNodeContext)\n                ) {\n                  loopFrame.breakLoop(); // Loop end\n                } else if (\n                  nextNodeContext &&\n                  nextNodeContext.after &&\n                  nextNodeContext.sourceNode == formattingContext.rootSourceNode\n                ) {\n                  loopFrame.breakLoop(); // Loop end\n                } else {\n                  if (pending) {\n                    // Sync case\n                    pending = false;\n                  } else {\n                    // Async case\n                    loopFrame.continueLoop();\n                  }\n                }\n              });\n            if (pending) {\n              // Async case and loop end\n              pending = false;\n              return;\n            }\n          }\n\n          // Sync case\n          loopFrame.breakLoop();\n        })\n        .then(() => {\n          frame.finish(nextNodeContext);\n        });\n    });\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  finishBreak(\n    column: LayoutType.Column,\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean> | null {\n    return LayoutProcessor.BlockLayoutProcessor.prototype.finishBreak.call(\n      this,\n      column,\n      nodeContext,\n      forceRemoveSelf,\n      endOfColumn,\n    );\n  }\n\n  /**\n   * @override\n   */\n  clearOverflownViewNodes(\n    column: LayoutType.Column,\n    parentNodeContext: Vtree.NodeContext,\n    nodeContext: Vtree.NodeContext,\n    removeSelf: boolean,\n  ) {\n    LayoutProcessor.BlockLayoutProcessor.prototype.clearOverflownViewNodes(\n      column,\n      parentNodeContext,\n      nodeContext,\n      removeSelf,\n    );\n  }\n}\n\nfunction eachAncestorNodeContext(\n  nodeContext: Vtree.NodeContext,\n  callback: (\n    p1: RepetitiveElementsOwnerFormattingContext,\n    p2: Vtree.NodeContext,\n  ) => any,\n): void {\n  for (let nc = nodeContext; nc; nc = nc.parent) {\n    const formattingContext = nc.formattingContext;\n    if (\n      formattingContext &&\n      formattingContext instanceof RepetitiveElementsOwnerFormattingContext &&\n      !nc.belongsTo(formattingContext)\n    ) {\n      callback(formattingContext, nc);\n    }\n  }\n}\n\nexport function appendHeaderToAncestors(\n  nodeContext: Vtree.NodeContext,\n  column: LayoutType.Column,\n): void {\n  if (!nodeContext) {\n    return;\n  }\n  eachAncestorNodeContext(\n    nodeContext.after ? nodeContext.parent : nodeContext,\n    (formattingContext, nc) => {\n      if (Table.isInstanceOfTableFormattingContext(formattingContext)) {\n        return;\n      }\n      column.fragmentLayoutConstraints.push(\n        new RepetitiveElementsOwnerLayoutConstraint(nc),\n      );\n    },\n  );\n}\n\nexport function appendHeader(\n  formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n  nodeContext: Vtree.NodeContext,\n  column: LayoutType.Column,\n): Task.Result<boolean> {\n  const repetitiveElements = formattingContext.getRepetitiveElements();\n  if (repetitiveElements) {\n    const rootNodeContext = formattingContext.getRootNodeContext(nodeContext);\n    if (rootNodeContext.viewNode) {\n      const firstChild = rootNodeContext.viewNode.firstChild;\n      return repetitiveElements.appendHeaderToFragment(\n        rootNodeContext,\n        firstChild,\n        column,\n      );\n    }\n  }\n  return Task.newResult(true);\n}\n\nexport function appendFooter(\n  formattingContext: RepetitiveElement.RepetitiveElementsOwnerFormattingContext,\n  nodeContext: Vtree.NodeContext,\n  column: LayoutType.Column,\n): Task.Result<boolean> {\n  const repetitiveElements = formattingContext.getRepetitiveElements();\n  if (repetitiveElements) {\n    if (!repetitiveElements.isSkipFooter) {\n      const rootNodeContext = formattingContext.getRootNodeContext(nodeContext);\n      if (rootNodeContext.viewNode) {\n        return repetitiveElements.appendFooterToFragment(\n          rootNodeContext,\n          null,\n          column,\n        );\n      }\n    }\n  }\n  return Task.newResult(true);\n}\n\nfunction getRepetitiveElementsOwnerFormattingContextOrNull(\n  nodeContext: Vtree.NodeContext,\n): RepetitiveElement.RepetitiveElementsOwnerFormattingContext | null {\n  const formattingContext = nodeContext.formattingContext;\n  if (!formattingContext) {\n    return null;\n  }\n  if (\n    !(formattingContext instanceof RepetitiveElementsOwnerFormattingContext)\n  ) {\n    return null;\n  }\n  return formattingContext;\n}\n\nfunction getRepetitiveElementsOwnerFormattingContext(\n  formattingContext: Vtree.FormattingContext,\n): RepetitiveElement.RepetitiveElementsOwnerFormattingContext {\n  Asserts.assert(\n    formattingContext instanceof RepetitiveElementsOwnerFormattingContext,\n  );\n  return formattingContext as RepetitiveElement.RepetitiveElementsOwnerFormattingContext;\n}\n\nconst repetitiveLayoutProcessor = new RepetitiveElementsOwnerLayoutProcessor();\n\nPlugin.registerHook(\n  Plugin.HOOKS.RESOLVE_LAYOUT_PROCESSOR,\n  (formattingContext) => {\n    if (\n      formattingContext instanceof RepetitiveElementsOwnerFormattingContext &&\n      !Table.isInstanceOfTableFormattingContext(formattingContext)\n    ) {\n      return repetitiveLayoutProcessor;\n    }\n    return null;\n  },\n);\n","/**\n * Copyright 2016 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Table - Table formatting context and layout.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as BreakPosition from \"./break-position\";\nimport * as Css from \"./css\";\nimport * as LayoutHelper from \"./layout-helper\";\nimport * as LayoutProcessor from \"./layout-processor\";\nimport * as LayoutRetryers from \"./layout-retryers\";\nimport * as LayoutUtil from \"./layout-util\";\nimport * as Plugin from \"./plugin\";\nimport * as RepetitiveElementImpl from \"./repetitive-element\";\nimport * as Task from \"./task\";\nimport * as Vgen from \"./vgen\";\nimport * as VtreeImpl from \"./vtree\";\nimport * as Layout from \"./layout\";\nimport {\n  FormattingContextType,\n  FragmentLayoutConstraintType,\n  Layout as LayoutType,\n  RepetitiveElement,\n  Table,\n  Vtree,\n} from \"./types\";\n\nexport class TableRow {\n  cells: TableCell[] = [];\n\n  constructor(\n    public readonly rowIndex: number,\n    public readonly sourceNode: Node,\n  ) {}\n\n  addCell(cell: TableCell) {\n    this.cells.push(cell);\n  }\n\n  getMinimumHeight(): number {\n    return Math.min.apply(\n      null,\n      this.cells.map((c) => c.height),\n    );\n  }\n}\n\nexport class TableCell {\n  viewElement: Element | null;\n  colSpan: number;\n  rowSpan: number;\n  height: number = 0;\n  anchorSlot: TableSlot = null;\n\n  constructor(\n    public readonly rowIndex: number,\n    public readonly columnIndex: number,\n    viewElement: Element,\n  ) {\n    this.viewElement = viewElement;\n    this.colSpan = (viewElement as HTMLTableCellElement).colSpan || 1;\n    this.rowSpan = (viewElement as HTMLTableCellElement).rowSpan || 1;\n  }\n\n  setHeight(height: number) {\n    this.height = height;\n  }\n\n  setAnchorSlot(slot: TableSlot) {\n    this.anchorSlot = slot;\n  }\n}\n\nexport class TableSlot {\n  constructor(\n    public readonly rowIndex: number,\n    public readonly columnIndex: number,\n    public readonly cell: TableCell,\n  ) {}\n}\n\nexport class TableCellFragment {\n  pseudoColumn: Layout.PseudoColumn;\n  empty: boolean = false;\n\n  constructor(\n    public readonly column: Layout.Column,\n    pseudoColumnContainer: Element,\n    public readonly cellNodeContext: Vtree.NodeContext,\n  ) {\n    this.pseudoColumn = new Layout.PseudoColumn(\n      column,\n      pseudoColumnContainer,\n      cellNodeContext,\n    );\n  }\n\n  findAcceptableBreakPosition(): Layout.BreakPositionAndNodeContext {\n    const element = this.cellNodeContext.viewNode as Element;\n    const verticalAlign = this.cellNodeContext.verticalAlign;\n    if (verticalAlign === \"middle\" || verticalAlign === \"bottom\") {\n      Base.setCSSProperty(element, \"vertical-align\", \"top\");\n    }\n    const bp = this.pseudoColumn.findAcceptableBreakPosition(true);\n    Base.setCSSProperty(element, \"vertical-align\", verticalAlign);\n    return bp;\n  }\n}\n\nexport class TableCaptionView {\n  constructor(\n    public readonly viewNode: Element,\n    public readonly side: string,\n  ) {}\n}\n\nexport class BetweenTableRowBreakPosition extends BreakPosition.EdgeBreakPosition {\n  private formattingContext: TableFormattingContext;\n\n  acceptableCellBreakPositions: Layout.BreakPositionAndNodeContext[] = null;\n  private rowIndex: number | null = null;\n\n  constructor(\n    position: Vtree.NodeContext,\n    breakOnEdge: string | null,\n    overflows: boolean,\n    columnBlockSize: number,\n  ) {\n    super(position, breakOnEdge, overflows, columnBlockSize);\n    this.formattingContext = position.formattingContext as TableFormattingContext;\n  }\n\n  /**\n   * @override\n   */\n  findAcceptableBreak(\n    column: Layout.Column,\n    penalty: number,\n  ): Vtree.NodeContext {\n    const breakNodeContext = super.findAcceptableBreak(column, penalty);\n    if (penalty < this.getMinBreakPenalty()) {\n      return null;\n    }\n    const allCellsBreakable = this.getAcceptableCellBreakPositions().every(\n      (bp) => !!bp.nodeContext,\n    );\n    if (allCellsBreakable) {\n      return breakNodeContext;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * @override\n   */\n  getMinBreakPenalty(): number {\n    let penalty = super.getMinBreakPenalty();\n    this.getAcceptableCellBreakPositions().forEach((bp) => {\n      penalty += bp.breakPosition.getMinBreakPenalty();\n    });\n    return penalty;\n  }\n\n  getAcceptableCellBreakPositions(): Layout.BreakPositionAndNodeContext[] {\n    if (!this.acceptableCellBreakPositions) {\n      const formattingContext = this.formattingContext;\n      const cellFragments = this.getCellFragments();\n      this.acceptableCellBreakPositions = cellFragments.map((cellFragment) =>\n        cellFragment.findAcceptableBreakPosition(),\n      );\n    }\n    return this.acceptableCellBreakPositions;\n  }\n\n  private getRowIndex(): number {\n    if (this.rowIndex != null) {\n      return this.rowIndex;\n    }\n    return (this.rowIndex = this.formattingContext.findRowIndexBySourceNode(\n      this.position.sourceNode,\n    ));\n  }\n\n  private getCellFragments() {\n    return this.formattingContext\n      .getRowSpanningCellsOverflowingTheRow(this.getRowIndex())\n      .map(\n        this.formattingContext.getCellFragmentOfCell,\n        this.formattingContext,\n      );\n  }\n}\n\nexport class InsideTableRowBreakPosition extends BreakPosition.AbstractBreakPosition {\n  acceptableCellBreakPositions: Layout.BreakPositionAndNodeContext[] = null;\n\n  constructor(\n    public readonly rowIndex: number,\n    public readonly beforeNodeContext: Vtree.NodeContext,\n    public readonly formattingContext: TableFormattingContext,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  findAcceptableBreak(\n    column: Layout.Column,\n    penalty: number,\n  ): Vtree.NodeContext {\n    if (penalty < this.getMinBreakPenalty()) {\n      return null;\n    }\n    const cellFragments = this.getCellFragments();\n    const acceptableCellBreakPositions = this.getAcceptableCellBreakPositions();\n    const allCellsBreakable =\n      acceptableCellBreakPositions.every((bp) => !!bp.nodeContext) &&\n      acceptableCellBreakPositions.some((bp, index) => {\n        const pseudoColumn = cellFragments[index].pseudoColumn;\n        const nodeContext = bp.nodeContext;\n        return (\n          !pseudoColumn.isStartNodeContext(nodeContext) &&\n          !pseudoColumn.isLastAfterNodeContext(nodeContext)\n        );\n      });\n    this.beforeNodeContext.overflow = acceptableCellBreakPositions.some(\n      (bp) => bp.nodeContext && bp.nodeContext.overflow,\n    );\n    if (allCellsBreakable) {\n      return this.beforeNodeContext;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * @override\n   */\n  getMinBreakPenalty(): number {\n    const formattingContext = this.formattingContext;\n    const row = formattingContext.getRowByIndex(this.rowIndex);\n    let penalty = 0;\n    if (!formattingContext.isFreelyFragmentableRow(row)) {\n      penalty += 10;\n    }\n    this.getAcceptableCellBreakPositions().forEach((bp) => {\n      penalty += bp.breakPosition.getMinBreakPenalty();\n    });\n    return penalty;\n  }\n\n  getAcceptableCellBreakPositions(): Layout.BreakPositionAndNodeContext[] {\n    if (!this.acceptableCellBreakPositions) {\n      const cellFragments = this.getCellFragments();\n      this.acceptableCellBreakPositions = cellFragments.map((cellFragment) =>\n        cellFragment.findAcceptableBreakPosition(),\n      );\n    }\n    return this.acceptableCellBreakPositions;\n  }\n\n  private getCellFragments() {\n    return this.formattingContext\n      .getCellsFallingOnRow(this.rowIndex)\n      .map(\n        this.formattingContext.getCellFragmentOfCell,\n        this.formattingContext,\n      );\n  }\n}\n\nexport type BrokenTableCellPosition = {\n  cellNodePosition: Vtree.NodePosition;\n  breakChunkPosition: Vtree.ChunkPosition;\n  cell: TableCell;\n};\n\n/**\n * @param tableSourceNode Source node of the table\n */\nexport class TableFormattingContext\n  extends RepetitiveElementImpl.RepetitiveElementsOwnerFormattingContext\n  implements Table.TableFormattingContext {\n  formattingContextType: FormattingContextType = \"Table\";\n  vertical: boolean = false;\n  columnCount: number = -1;\n  tableWidth: number = 0;\n  captions: TableCaptionView[] = [];\n  colGroups: DocumentFragment | null = null;\n  colWidths: number[] | null = null;\n  inlineBorderSpacing: number = 0;\n  rows: TableRow[] = [];\n  slots: TableSlot[][] = [];\n  cellFragments: TableCellFragment[][] = [];\n  lastRowViewNode: Element | null = null;\n  cellBreakPositions: BrokenTableCellPosition[] = [];\n  repetitiveElements: RepetitiveElement.RepetitiveElements | null = null;\n\n  constructor(\n    parent: Vtree.FormattingContext,\n    public readonly tableSourceNode: Element,\n  ) {\n    super(parent, tableSourceNode);\n  }\n\n  /**\n   * @override\n   */\n  getName(): string {\n    return \"Table formatting context (Table.TableFormattingContext)\";\n  }\n\n  /**\n   * @override\n   */\n  isFirstTime(nodeContext: Vtree.NodeContext, firstTime: boolean): boolean {\n    if (!firstTime) {\n      return firstTime;\n    }\n    switch (nodeContext.display) {\n      case \"table-row\":\n        return this.cellBreakPositions.length === 0;\n      case \"table-cell\":\n        return !this.cellBreakPositions.some(\n          (p) => p.cellNodePosition.steps[0].node === nodeContext.sourceNode,\n        );\n      default:\n        return firstTime;\n    }\n  }\n\n  /**\n   * @override\n   */\n  getParent(): Vtree.FormattingContext {\n    return this.parent;\n  }\n\n  finishFragment() {\n    this.cellFragments = [];\n  }\n\n  addRow(rowIndex: number, row: TableRow) {\n    this.rows[rowIndex] = row;\n  }\n\n  getRowSlots(rowIndex: number): TableSlot[] {\n    let rowSlots = this.slots[rowIndex];\n    if (!rowSlots) {\n      rowSlots = this.slots[rowIndex] = [];\n    }\n    return rowSlots;\n  }\n\n  addCell(rowIndex: number, cell: TableCell) {\n    let row = this.rows[rowIndex];\n    if (!row) {\n      this.addRow(rowIndex, new TableRow(rowIndex, null));\n      row = this.rows[rowIndex];\n    }\n    Asserts.assert(row);\n    row.addCell(cell);\n    const rowUpper = rowIndex + cell.rowSpan;\n    let rowSlots = this.getRowSlots(rowIndex);\n    let startColIndex = 0;\n    while (rowSlots[startColIndex]) {\n      startColIndex++;\n    }\n    for (; rowIndex < rowUpper; rowIndex++) {\n      rowSlots = this.getRowSlots(rowIndex);\n      for (let i = startColIndex; i < startColIndex + cell.colSpan; i++) {\n        const slot = (rowSlots[i] = new TableSlot(rowIndex, i, cell));\n        if (!cell.anchorSlot) {\n          cell.setAnchorSlot(slot);\n        }\n      }\n    }\n  }\n\n  getRowByIndex(index: number): TableRow {\n    const row = this.rows[index];\n    Asserts.assert(row);\n    return row;\n  }\n\n  findRowIndexBySourceNode(sourceNode: Node): number {\n    return this.rows.findIndex((row) => sourceNode === row.sourceNode);\n  }\n\n  addCellFragment(\n    rowIndex: number,\n    columnIndex: number,\n    cellFragment: TableCellFragment,\n  ) {\n    let list = this.cellFragments[rowIndex];\n    if (!list) {\n      list = this.cellFragments[rowIndex] = [];\n    }\n    list[columnIndex] = cellFragment;\n  }\n\n  getCellsFallingOnRow(rowIndex: number): TableCell[] {\n    const rowSlots = this.getRowSlots(rowIndex);\n    return rowSlots.reduce((uniqueCells, slot) => {\n      if (slot.cell !== uniqueCells[uniqueCells.length - 1]) {\n        return uniqueCells.concat(slot.cell);\n      } else {\n        return uniqueCells;\n      }\n    }, []);\n  }\n\n  getRowSpanningCellsOverflowingTheRow(rowIndex: number): TableCell[] {\n    return this.getCellsFallingOnRow(rowIndex).filter(\n      (cell) => cell.rowIndex + cell.rowSpan - 1 > rowIndex,\n    );\n  }\n\n  getCellFragmentOfCell(cell: TableCell): TableCellFragment {\n    return (\n      this.cellFragments[cell.rowIndex] &&\n      this.cellFragments[cell.rowIndex][cell.columnIndex]\n    );\n  }\n\n  isFreelyFragmentableRow(row: TableRow): boolean {\n    return row.getMinimumHeight() > this.tableWidth / 2;\n  }\n\n  getColumnCount(): number {\n    if (this.columnCount < 0) {\n      this.columnCount = Math.max.apply(\n        null,\n        this.rows.map((row) =>\n          row.cells.reduce((sum, c) => sum + c.colSpan, 0),\n        ),\n      );\n    }\n    return this.columnCount;\n  }\n\n  updateCellSizes(clientLayout: Vtree.ClientLayout) {\n    this.rows.forEach((row) => {\n      row.cells.forEach((cell) => {\n        const rect = clientLayout.getElementClientRect(\n          cell.viewElement as Element,\n        );\n        cell.viewElement = null;\n        cell.setHeight(this.vertical ? rect[\"width\"] : rect[\"height\"]);\n      });\n    });\n  }\n\n  /**\n   * @return position\n   */\n  findCellFromColumn(\n    column: Layout.Column,\n  ): { rowIndex: number; columnIndex: number } | null {\n    if (!column) {\n      return null;\n    }\n    let tableCell: TableCell = null;\n    let row = 0;\n    let col = 0;\n    loop: for (row = 0; row < this.cellFragments.length; row++) {\n      if (!this.cellFragments[row]) {\n        continue;\n      }\n      for (col = 0; col < this.cellFragments[row].length; col++) {\n        if (!this.cellFragments[row][col]) {\n          continue;\n        }\n        if (column === this.cellFragments[row][col].pseudoColumn.getColumn()) {\n          tableCell = this.rows[row].cells[col];\n          break loop;\n        }\n      }\n    }\n    if (!tableCell) {\n      return null;\n    }\n    for (; row < this.slots.length; row++) {\n      for (; col < this.slots[row].length; col++) {\n        const slot = this.slots[row][col];\n        if (slot.cell === tableCell) {\n          return { rowIndex: slot.rowIndex, columnIndex: slot.columnIndex };\n        }\n      }\n    }\n    return null;\n  }\n\n  collectElementsOffsetOfUpperCells(\n    position: { rowIndex: number; columnIndex: number } | null,\n  ): RepetitiveElement.ElementsOffset[] {\n    const collected = [];\n    return this.slots.reduce((repetitiveElements, row, index) => {\n      if (index >= position.rowIndex) {\n        return repetitiveElements;\n      }\n      const cellFragment = this.getCellFragmentOfCell(\n        row[position.columnIndex].cell,\n      );\n      if (!cellFragment || collected.includes(cellFragment)) {\n        return repetitiveElements;\n      }\n      this.collectElementsOffsetFromColumn(\n        cellFragment.pseudoColumn.getColumn(),\n        repetitiveElements,\n      );\n      collected.push(cellFragment);\n      return repetitiveElements;\n    }, [] as RepetitiveElement.ElementsOffset[]);\n  }\n\n  collectElementsOffsetOfHighestColumn(): RepetitiveElement.ElementsOffset[] {\n    const elementsInColumn = [];\n    this.rows.forEach((row) => {\n      row.cells.forEach((cell, index) => {\n        if (!elementsInColumn[index]) {\n          elementsInColumn[index] = { collected: [], elements: [] };\n        }\n        const state = elementsInColumn[index];\n        const cellFragment = this.getCellFragmentOfCell(cell);\n        if (!cellFragment || state.collected.includes(cellFragment)) {\n          return;\n        }\n        this.collectElementsOffsetFromColumn(\n          cellFragment.pseudoColumn.getColumn(),\n          state.elements,\n        );\n        state.collected.push(cellFragment);\n      });\n    });\n    return [\n      new ElementsOffsetOfTableCell(\n        elementsInColumn.map((entry) => entry.elements),\n      ),\n    ];\n  }\n\n  private collectElementsOffsetFromColumn(\n    column: LayoutType.Column,\n    repetitiveElements: RepetitiveElement.ElementsOffset[],\n  ) {\n    column.fragmentLayoutConstraints.forEach((constraint) => {\n      if (\n        RepetitiveElement.isInstanceOfRepetitiveElementsOwnerLayoutConstraint(\n          constraint,\n        )\n      ) {\n        const repetitiveElement = constraint.getRepetitiveElements();\n        repetitiveElements.push(repetitiveElement);\n      }\n      if (Table.isInstanceOfTableRowLayoutConstraint(constraint)) {\n        constraint\n          .getElementsOffsetsForTableCell(null)\n          .forEach((repetitiveElement) => {\n            repetitiveElements.push(repetitiveElement);\n          });\n      }\n    });\n  }\n\n  /** @override */\n  saveState(): any {\n    return [].concat(this.cellBreakPositions);\n  }\n\n  /** @override */\n  restoreState(state: any) {\n    this.cellBreakPositions = state as BrokenTableCellPosition[];\n  }\n}\n\nexport class ElementsOffsetOfTableCell\n  implements RepetitiveElement.ElementsOffset {\n  constructor(\n    public readonly repeatitiveElementsInColumns: RepetitiveElement.ElementsOffset[][],\n  ) {}\n\n  /** @override */\n  calculateOffset(nodeContext: Vtree.NodeContext): number {\n    return this.calculateMaxOffsetOfColumn(\n      nodeContext,\n      (offsets) => offsets.current,\n    );\n  }\n\n  /** @override */\n  calculateMinimumOffset(nodeContext: Vtree.NodeContext): number {\n    return this.calculateMaxOffsetOfColumn(\n      nodeContext,\n      (offsets) => offsets.minimum,\n    );\n  }\n\n  private calculateMaxOffsetOfColumn(nodeContext, resolver) {\n    let maxOffset = 0;\n    this.repeatitiveElementsInColumns.forEach((repetitiveElements) => {\n      const offsets = BreakPosition.calculateOffset(\n        nodeContext,\n        repetitiveElements,\n      );\n      maxOffset = Math.max(maxOffset, resolver(offsets));\n    });\n    return maxOffset;\n  }\n}\n\nfunction getTableFormattingContext(\n  formattingContext: Vtree.FormattingContext,\n): TableFormattingContext {\n  Asserts.assert(formattingContext instanceof TableFormattingContext);\n  return formattingContext as TableFormattingContext;\n}\n\nfunction isTableRowGrouping(display: string | null): boolean {\n  return (\n    display === \"table-row-group\" ||\n    display === \"table-header-group\" ||\n    display === \"table-footer-group\"\n  );\n}\n\nfunction isTableRoot(display: string | null): boolean {\n  return display === \"table\" || display === \"inline-table\";\n}\n\nfunction isValidParentOfTableRow(display: string | null): boolean {\n  return isTableRowGrouping(display) || isTableRoot(display);\n}\n\nfunction skipNestedTable(\n  state: LayoutUtil.LayoutIteratorState,\n  formattingContext: TableFormattingContext,\n  column: Layout.Column,\n): Task.Result<boolean> | null {\n  const nodeContext = state.nodeContext;\n  const display = nodeContext.display;\n  const parentDisplay = nodeContext.parent ? nodeContext.parent.display : null;\n\n  // Is inline-table nested in another table?\n  let isNestedInlineTable = false;\n  if (\n    parentDisplay === \"inline-table\" &&\n    !(nodeContext.formattingContext instanceof TableFormattingContext)\n  ) {\n    for (let nc = nodeContext.parent; nc; nc = nc.parent) {\n      if (nc.formattingContext instanceof TableFormattingContext) {\n        isNestedInlineTable = nc.formattingContext === formattingContext;\n        break;\n      }\n    }\n  }\n  const isNestedTable =\n    isNestedInlineTable ||\n    (display === \"table-row\" && !isValidParentOfTableRow(parentDisplay)) ||\n    (display === \"table-cell\" &&\n      parentDisplay !== \"table-row\" &&\n      !isValidParentOfTableRow(parentDisplay)) ||\n    (nodeContext.formattingContext instanceof TableFormattingContext &&\n      nodeContext.formattingContext !== formattingContext);\n  if (isNestedTable) {\n    return column\n      .buildDeepElementView(nodeContext)\n      .thenAsync((nodeContextAfter) => {\n        state.nodeContext = nodeContextAfter;\n        return Task.newResult(true);\n      });\n  } else {\n    return null;\n  }\n}\n\nexport class EntireTableLayoutStrategy extends LayoutUtil.EdgeSkipper {\n  rowIndex: number = -1;\n  columnIndex: number = 0;\n  inRow: boolean = false;\n  checkPoints: Vtree.NodeContext[] = [];\n  inHeaderOrFooter: boolean = false;\n\n  constructor(\n    public readonly formattingContext: TableFormattingContext,\n    public readonly column: Layout.Column,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  startNonInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    const formattingContext = this.formattingContext;\n    const r = skipNestedTable(state, formattingContext, this.column);\n    if (r) {\n      return r;\n    }\n    this.postLayoutBlockContents(state);\n    const nodeContext = state.nodeContext;\n    const display = nodeContext.display;\n    const repetitiveElements = formattingContext.getRepetitiveElements();\n    switch (display) {\n      case \"table\":\n        formattingContext.inlineBorderSpacing = nodeContext.inlineBorderSpacing;\n        break;\n      case \"table-caption\": {\n        const captionView = new TableCaptionView(\n          nodeContext.viewNode as Element,\n          nodeContext.captionSide,\n        );\n        formattingContext.captions.push(captionView);\n        break;\n      }\n      case \"table-header-group\":\n        if (!repetitiveElements.isHeaderRegistered()) {\n          this.inHeaderOrFooter = true;\n          repetitiveElements.setHeaderNodeContext(nodeContext);\n        }\n        return Task.newResult(true);\n      case \"table-footer-group\":\n        if (!repetitiveElements.isFooterRegistered()) {\n          this.inHeaderOrFooter = true;\n          repetitiveElements.setFooterNodeContext(nodeContext);\n        }\n        return Task.newResult(true);\n      case \"table-row\":\n        if (!this.inHeaderOrFooter) {\n          this.inRow = true;\n          this.rowIndex++;\n          Asserts.assert(nodeContext.sourceNode);\n          this.columnIndex = 0;\n          formattingContext.addRow(\n            this.rowIndex,\n            new TableRow(this.rowIndex, nodeContext.sourceNode),\n          );\n          if (!repetitiveElements.firstContentSourceNode) {\n            repetitiveElements.firstContentSourceNode = nodeContext.sourceNode as Element;\n          }\n        }\n        break;\n    }\n    return super.startNonInlineElementNode(state);\n  }\n\n  /**\n   * @override\n   */\n  afterNonInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    const formattingContext = this.formattingContext;\n    const nodeContext = state.nodeContext;\n    const display = nodeContext.display;\n    const clientLayout = this.column.clientLayout;\n    this.postLayoutBlockContents(state);\n    if (nodeContext.sourceNode === formattingContext.tableSourceNode) {\n      const computedStyle = clientLayout.getElementComputedStyle(\n        formattingContext.getRootViewNode(nodeContext) as Element,\n      );\n      formattingContext.tableWidth = parseFloat(\n        computedStyle[formattingContext.vertical ? \"height\" : \"width\"],\n      );\n      formattingContext.getRepetitiveElements().lastContentSourceNode =\n        state.lastAfterNodeContext &&\n        (state.lastAfterNodeContext.sourceNode as Element);\n      state.break = true;\n    } else {\n      switch (display) {\n        case \"table-header-group\":\n        case \"table-footer-group\":\n          if (this.inHeaderOrFooter) {\n            this.inHeaderOrFooter = false;\n            return Task.newResult(true);\n          }\n          break;\n        case \"table-row\":\n          if (!this.inHeaderOrFooter) {\n            formattingContext.lastRowViewNode = nodeContext.viewNode as Element;\n            this.inRow = false;\n          }\n          break;\n        case \"table-cell\":\n          if (!this.inHeaderOrFooter) {\n            if (!this.inRow) {\n              this.rowIndex++;\n              this.columnIndex = 0;\n              this.inRow = true;\n            }\n            const elem = nodeContext.viewNode as Element;\n            formattingContext.addCell(\n              this.rowIndex,\n              new TableCell(this.rowIndex, this.columnIndex, elem),\n            );\n            this.columnIndex++;\n          }\n          break;\n      }\n    }\n    return super.afterNonInlineElementNode(state);\n  }\n\n  /** @override */\n  startNonElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    this.registerCheckPoint(state);\n  }\n\n  /** @override */\n  afterNonElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    this.registerCheckPoint(state);\n  }\n\n  /** @override */\n  startInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    this.registerCheckPoint(state);\n  }\n\n  /** @override */\n  afterInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    this.registerCheckPoint(state);\n  }\n\n  registerCheckPoint(state: LayoutUtil.LayoutIteratorState) {\n    const nodeContext = state.nodeContext;\n    if (\n      nodeContext &&\n      nodeContext.viewNode &&\n      !LayoutHelper.isSpecialNodeContext(nodeContext)\n    ) {\n      this.checkPoints.push(nodeContext.clone());\n    }\n  }\n\n  postLayoutBlockContents(state: LayoutUtil.LayoutIteratorState) {\n    if (this.checkPoints.length > 0) {\n      this.column.postLayoutBlock(state.nodeContext, this.checkPoints);\n    }\n    this.checkPoints = [];\n  }\n}\n\nexport class TableLayoutStrategy extends LayoutUtil.EdgeSkipper {\n  private static ignoreList: { [key: string]: boolean } = {\n    \"table-caption\": true,\n    \"table-column-group\": true,\n    \"table-column\": true,\n  };\n  inRow: boolean = false;\n  currentRowIndex: number = -1;\n  currentColumnIndex: number = 0;\n  originalStopAtOverflow: boolean;\n  inHeader: boolean;\n  inFooter: boolean;\n\n  constructor(\n    public readonly formattingContext: TableFormattingContext,\n    public readonly column: Layout.Column,\n  ) {\n    super(true);\n    this.originalStopAtOverflow = column.stopAtOverflow;\n    column.stopAtOverflow = false;\n  }\n\n  resetColumn() {\n    this.column.stopAtOverflow = this.originalStopAtOverflow;\n  }\n\n  getColSpanningCellWidth(cell: TableCell): number {\n    const colWidths = this.formattingContext.colWidths;\n    Asserts.assert(colWidths);\n    let width = 0;\n    for (let i = 0; i < cell.colSpan; i++) {\n      width += colWidths[cell.anchorSlot.columnIndex + i];\n    }\n    width += this.formattingContext.inlineBorderSpacing * (cell.colSpan - 1);\n    return width;\n  }\n\n  layoutCell(\n    cell: TableCell,\n    cellNodeContext: Vtree.NodeContext,\n    startChunkPosition: Vtree.ChunkPosition,\n  ): Task.Result<boolean> {\n    const rowIndex = cell.rowIndex;\n    const columnIndex = cell.columnIndex;\n    const colSpan = cell.colSpan;\n    const cellViewNode = cellNodeContext.viewNode as Element;\n    const verticalAlign = cellNodeContext.verticalAlign;\n    if (colSpan > 1) {\n      Base.setCSSProperty(cellViewNode, \"box-sizing\", \"border-box\");\n      Base.setCSSProperty(\n        cellViewNode,\n        this.formattingContext.vertical ? \"height\" : \"width\",\n        `${this.getColSpanningCellWidth(cell)}px`,\n      );\n    }\n    const pseudoColumnContainer = cellViewNode.ownerDocument.createElement(\n      \"div\",\n    );\n    cellViewNode.appendChild(pseudoColumnContainer);\n    const cellFragment = new TableCellFragment(\n      this.column,\n      pseudoColumnContainer,\n      cellNodeContext,\n    );\n    this.formattingContext.addCellFragment(rowIndex, columnIndex, cellFragment);\n    if (\n      startChunkPosition.primary.steps.length === 1 &&\n      startChunkPosition.primary.after\n    ) {\n      // Contents of the cell have ended in the previous fragment\n      cellFragment.empty = true;\n    }\n    return cellFragment.pseudoColumn\n      .layout(startChunkPosition, true)\n      .thenReturn(true);\n  }\n\n  hasBrokenCellAtSlot(slotIndex): boolean {\n    const cellBreakPosition = this.formattingContext.cellBreakPositions[0];\n    if (cellBreakPosition) {\n      return cellBreakPosition.cell.anchorSlot.columnIndex === slotIndex;\n    }\n    return false;\n  }\n\n  private extractRowSpanningCellBreakPositions(): BrokenTableCellPosition[][] {\n    const cellBreakPositions = this.formattingContext.cellBreakPositions;\n    if (cellBreakPositions.length === 0) {\n      return [];\n    }\n    const rowSpanningCellBreakPositions = [];\n    let i = 0;\n    do {\n      const p = cellBreakPositions[i];\n      const rowIndex = p.cell.rowIndex;\n      if (rowIndex < this.currentRowIndex) {\n        let arr = rowSpanningCellBreakPositions[rowIndex];\n        if (!arr) {\n          arr = rowSpanningCellBreakPositions[rowIndex] = [];\n        }\n        arr.push(p);\n        cellBreakPositions.splice(i, 1);\n      } else {\n        i++;\n      }\n    } while (i < cellBreakPositions.length);\n    return rowSpanningCellBreakPositions;\n  }\n\n  layoutRowSpanningCellsFromPreviousFragment(\n    state: LayoutUtil.LayoutIteratorState,\n  ): Task.Result<boolean> {\n    const formattingContext = this.formattingContext;\n    const rowSpanningCellBreakPositions = this.extractRowSpanningCellBreakPositions();\n    const rowCount = rowSpanningCellBreakPositions.reduce((s) => s + 1, 0);\n    if (rowCount === 0) {\n      return Task.newResult(true);\n    }\n    const layoutContext = this.column.layoutContext;\n    const currentRow = state.nodeContext;\n    currentRow.viewNode.parentNode.removeChild(currentRow.viewNode);\n    const frame = Task.newFrame<boolean>(\n      \"layoutRowSpanningCellsFromPreviousFragment\",\n    );\n    let cont = Task.newResult(true);\n    let spanningCellRowIndex = 0;\n    const occupiedSlotIndices = [];\n    rowSpanningCellBreakPositions.forEach((rowCellBreakPositions) => {\n      cont = cont.thenAsync(() => {\n        // Is it always correct to assume steps[1] to be the row?\n        const rowNodeContext = VtreeImpl.makeNodeContextFromNodePositionStep(\n          rowCellBreakPositions[0].cellNodePosition.steps[1],\n          currentRow.parent,\n        );\n        return layoutContext.setCurrent(rowNodeContext, false).thenAsync(() => {\n          let cont1 = Task.newResult(true);\n          let columnIndex = 0;\n\n          function addDummyCellUntil(upperColumnIndex) {\n            while (columnIndex < upperColumnIndex) {\n              if (!occupiedSlotIndices.includes(columnIndex)) {\n                const dummy = rowNodeContext.viewNode.ownerDocument.createElement(\n                  \"td\",\n                );\n                Base.setCSSProperty(dummy, \"padding\", \"0\");\n                rowNodeContext.viewNode.appendChild(dummy);\n              }\n              columnIndex++;\n            }\n          }\n          rowCellBreakPositions.forEach((cellBreakPosition) => {\n            cont1 = cont1.thenAsync(() => {\n              const cell = cellBreakPosition.cell;\n              addDummyCellUntil(cell.anchorSlot.columnIndex);\n              const cellNodePosition = cellBreakPosition.cellNodePosition;\n              const cellNodeContext = VtreeImpl.makeNodeContextFromNodePositionStep(\n                cellNodePosition.steps[0],\n                rowNodeContext,\n              );\n              cellNodeContext.offsetInNode = cellNodePosition.offsetInNode;\n              cellNodeContext.after = cellNodePosition.after;\n              cellNodeContext.fragmentIndex =\n                cellNodePosition.steps[0].fragmentIndex + 1;\n              return layoutContext\n                .setCurrent(cellNodeContext, false)\n                .thenAsync(() => {\n                  const breakChunkPosition =\n                    cellBreakPosition.breakChunkPosition;\n                  for (let i = 0; i < cell.colSpan; i++) {\n                    occupiedSlotIndices.push(columnIndex + i);\n                  }\n                  columnIndex += cell.colSpan;\n                  return this.layoutCell(\n                    cell,\n                    cellNodeContext,\n                    breakChunkPosition,\n                  ).thenAsync(() => {\n                    (cellNodeContext.viewNode as HTMLTableCellElement).rowSpan =\n                      cell.rowIndex +\n                      cell.rowSpan -\n                      this.currentRowIndex +\n                      rowCount -\n                      spanningCellRowIndex;\n                    return Task.newResult(true);\n                  });\n                });\n            });\n          });\n          return cont1.thenAsync(() => {\n            addDummyCellUntil(formattingContext.getColumnCount());\n            spanningCellRowIndex++;\n            return Task.newResult(true);\n          });\n        });\n      });\n    });\n    cont.then(() => {\n      layoutContext\n        .setCurrent(currentRow, true, state.atUnforcedBreak)\n        .then(() => {\n          frame.finish(true);\n        });\n    });\n    return frame.result();\n  }\n\n  startTableRow(state: LayoutUtil.LayoutIteratorState): Task.Result<boolean> {\n    if (this.inHeader || this.inFooter) {\n      return Task.newResult(true);\n    }\n    const nodeContext = state.nodeContext;\n    const formattingContext = this.formattingContext;\n    if (this.currentRowIndex < 0) {\n      Asserts.assert(nodeContext.sourceNode);\n      this.currentRowIndex = formattingContext.findRowIndexBySourceNode(\n        nodeContext.sourceNode,\n      );\n    } else {\n      this.currentRowIndex++;\n    }\n    this.currentColumnIndex = 0;\n    this.inRow = true;\n    return this.layoutRowSpanningCellsFromPreviousFragment(state).thenAsync(\n      () => {\n        this.registerCellFragmentIndex();\n        const overflown = this.column.checkOverflowAndSaveEdgeAndBreakPosition(\n          state.lastAfterNodeContext,\n          null,\n          true,\n          state.breakAtTheEdge,\n        );\n        if (\n          overflown &&\n          formattingContext.getRowSpanningCellsOverflowingTheRow(\n            this.currentRowIndex - 1,\n          ).length === 0\n        ) {\n          this.resetColumn();\n          nodeContext.overflow = true;\n          state.break = true;\n        }\n        return Task.newResult(true);\n      },\n    );\n  }\n\n  private registerCellFragmentIndex() {\n    const cells = this.formattingContext.getRowByIndex(this.currentRowIndex)\n      .cells;\n    cells.forEach((cell) => {\n      const cellBreakPosition = this.formattingContext.cellBreakPositions[\n        cell.columnIndex\n      ];\n      if (\n        cellBreakPosition &&\n        cellBreakPosition.cell.anchorSlot.columnIndex ==\n          cell.anchorSlot.columnIndex\n      ) {\n        const tdNodeStep = cellBreakPosition.cellNodePosition.steps[0];\n        const offset = (this.column\n          .layoutContext as Vgen.ViewFactory).xmldoc.getElementOffset(\n          tdNodeStep.node as Element,\n        );\n        Layout.registerFragmentIndex(offset, tdNodeStep.fragmentIndex + 1, 1);\n      }\n    });\n  }\n\n  startTableCell(state: LayoutUtil.LayoutIteratorState): Task.Result<boolean> {\n    if (this.inHeader || this.inFooter) {\n      return Task.newResult(true);\n    }\n    const nodeContext = state.nodeContext;\n    if (!this.inRow) {\n      if (this.currentRowIndex < 0) {\n        this.currentRowIndex = 0;\n      } else {\n        this.currentRowIndex++;\n      }\n      this.currentColumnIndex = 0;\n      this.inRow = true;\n    }\n    const cell = this.formattingContext.getRowByIndex(this.currentRowIndex)\n      .cells[this.currentColumnIndex];\n    const afterNodeContext = nodeContext.copy().modify();\n    afterNodeContext.after = true;\n    state.nodeContext = afterNodeContext;\n    const frame = Task.newFrame<boolean>(\"startTableCell\");\n    let cont: Task.Result<Vtree.ChunkPosition>;\n    if (this.hasBrokenCellAtSlot(cell.anchorSlot.columnIndex)) {\n      const cellBreakPosition = this.formattingContext.cellBreakPositions.shift();\n      nodeContext.fragmentIndex =\n        cellBreakPosition.cellNodePosition.steps[0].fragmentIndex + 1;\n      cont = Task.newResult(cellBreakPosition.breakChunkPosition);\n    } else {\n      cont = this.column\n        .nextInTree(nodeContext, state.atUnforcedBreak)\n        .thenAsync((nextNodeContext) => {\n          if (nextNodeContext.viewNode) {\n            nodeContext.viewNode.removeChild(nextNodeContext.viewNode);\n          }\n          const startNodePosition = VtreeImpl.newNodePositionFromNodeContext(\n            nextNodeContext,\n            0,\n          );\n          return Task.newResult(new VtreeImpl.ChunkPosition(startNodePosition));\n        });\n    }\n    cont.then((startChunkPosition) => {\n      Asserts.assert(nodeContext);\n      this.layoutCell(cell, nodeContext, startChunkPosition).then(() => {\n        this.afterNonInlineElementNode(state);\n        this.currentColumnIndex++;\n        frame.finish(true);\n      });\n    });\n    return frame.result();\n  }\n\n  startNonInlineBox(\n    state: LayoutUtil.LayoutIteratorState,\n  ): Task.Result<boolean> {\n    const r = skipNestedTable(\n      state,\n      getTableFormattingContext(this.formattingContext),\n      this.column,\n    );\n    if (r) {\n      return r;\n    }\n    const nodeContext = state.nodeContext;\n    const repetitiveElements = this.formattingContext.getRepetitiveElements();\n    const display = nodeContext.display;\n    if (\n      display === \"table-header-group\" &&\n      repetitiveElements &&\n      repetitiveElements.isHeaderSourceNode(nodeContext.sourceNode)\n    ) {\n      this.inHeader = true;\n      return Task.newResult(true);\n    } else if (\n      display === \"table-footer-group\" &&\n      repetitiveElements &&\n      repetitiveElements.isFooterSourceNode(nodeContext.sourceNode)\n    ) {\n      this.inFooter = true;\n      return Task.newResult(true);\n    } else if (display === \"table-row\") {\n      return this.startTableRow(state);\n    } else if (display === \"table-cell\") {\n      return this.startTableCell(state);\n    } else {\n      return Task.newResult(true);\n    }\n  }\n\n  endNonInlineBox(state: LayoutUtil.LayoutIteratorState): Task.Result<boolean> {\n    const nodeContext = state.nodeContext;\n    const display = nodeContext.display;\n    if (display === \"table-row\") {\n      this.inRow = false;\n      if (!this.inHeader && !this.inFooter) {\n        const beforeNodeContext = nodeContext.copy().modify();\n        beforeNodeContext.after = false;\n        const bp = new InsideTableRowBreakPosition(\n          this.currentRowIndex,\n          beforeNodeContext,\n          this.formattingContext,\n        );\n        this.column.breakPositions.push(bp);\n      }\n    }\n    return Task.newResult(true);\n  }\n\n  afterNonInlineElementNode(\n    state: LayoutUtil.LayoutIteratorState,\n  ): void | Task.Result<boolean> {\n    const nodeContext = state.nodeContext;\n    const repetitiveElements = this.formattingContext.getRepetitiveElements();\n    const display = nodeContext.display;\n    if (display === \"table-header-group\") {\n      if (\n        repetitiveElements &&\n        !repetitiveElements.allowInsertRepeatitiveElements &&\n        repetitiveElements.isHeaderSourceNode(nodeContext.sourceNode)\n      ) {\n        this.inHeader = false;\n        nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n      } else {\n        Base.setCSSProperty(\n          nodeContext.viewNode as Element,\n          \"display\",\n          \"table-row-group\",\n        );\n      }\n    } else if (display === \"table-footer-group\") {\n      if (\n        repetitiveElements &&\n        !repetitiveElements.allowInsertRepeatitiveElements &&\n        repetitiveElements.isFooterSourceNode(nodeContext.sourceNode)\n      ) {\n        this.inFooter = false;\n        nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n      } else {\n        Base.setCSSProperty(\n          nodeContext.viewNode as Element,\n          \"display\",\n          \"table-row-group\",\n        );\n      }\n    }\n    if (display && TableLayoutStrategy.ignoreList[display]) {\n      nodeContext.viewNode.parentNode.removeChild(nodeContext.viewNode);\n    } else if (\n      nodeContext.sourceNode === this.formattingContext.tableSourceNode\n    ) {\n      nodeContext.overflow = this.column.checkOverflowAndSaveEdge(\n        nodeContext,\n        null,\n      );\n      this.resetColumn();\n      state.break = true;\n    } else {\n      return super.afterNonInlineElementNode(state);\n    }\n    return Task.newResult(true);\n  }\n}\n\ntype TableLayoutOption = {\n  calculateBreakPositionsInside: boolean;\n};\nconst tableLayoutOptionCache: {\n  root: Node;\n  tableLayoutOption: TableLayoutOption;\n}[] = [];\n\nfunction getTableLayoutOption(\n  tableRootSourceNode: Node,\n): TableLayoutOption | null {\n  const i = tableLayoutOptionCache.findIndex(\n    (c) => c.root === tableRootSourceNode,\n  );\n  const pair = tableLayoutOptionCache[i];\n  return pair ? pair.tableLayoutOption : null;\n}\n\nfunction clearTableLayoutOptionCache(tableRootSourceNode: Node): void {\n  const i = tableLayoutOptionCache.findIndex(\n    (c) => c.root === tableRootSourceNode,\n  );\n  if (i >= 0) {\n    tableLayoutOptionCache.splice(i, 1);\n  }\n}\n\nexport class TableLayoutProcessor implements LayoutProcessor.LayoutProcessor {\n  private layoutEntireTable(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getTableFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const strategy = new EntireTableLayoutStrategy(formattingContext, column);\n    const iterator = new LayoutUtil.LayoutIterator(\n      strategy,\n      column.layoutContext,\n    );\n    return iterator.iterate(nodeContext);\n  }\n\n  private getColumnWidths(\n    lastRow: Element,\n    columnCount: number,\n    vertical: boolean,\n    clientLayout: Vtree.ClientLayout,\n  ): number[] {\n    const doc = lastRow.ownerDocument;\n    const dummyRow = doc.createElement(\"tr\");\n    const dummyCells = [];\n    for (let i = 0; i < columnCount; i++) {\n      const cell = doc.createElement(\"td\");\n      dummyRow.appendChild(cell);\n      dummyCells.push(cell);\n    }\n    lastRow.parentNode.insertBefore(dummyRow, lastRow.nextSibling);\n    const colWidths = dummyCells.map((cell) => {\n      const rect = clientLayout.getElementClientRect(cell);\n      return vertical ? rect[\"height\"] : rect[\"width\"];\n    });\n    lastRow.parentNode.removeChild(dummyRow);\n    return colWidths;\n  }\n\n  private getColGroupElements(tableElement: Element): Element[] {\n    const colGroups = [];\n    let child = tableElement.firstElementChild;\n    while (child) {\n      if (child.localName === \"colgroup\") {\n        colGroups.push(child);\n      }\n      child = child.nextElementSibling;\n    }\n    return colGroups;\n  }\n\n  private normalizeAndGetColElements(colGroups: Element[]): Element[] {\n    const cols = [];\n    colGroups.forEach((colGroup) => {\n      // Replace colgroup[span=n] with colgroup with n col elements\n      let span = (colGroup as any).span;\n      colGroup.removeAttribute(\"span\");\n      let col = colGroup.firstElementChild;\n      while (col) {\n        if (col.localName === \"col\") {\n          // Replace col[span=n] with n col elements\n          let s = (col as any).span;\n          col.removeAttribute(\"span\");\n          span -= s;\n          while (s-- > 1) {\n            const cloned = col.cloneNode(true);\n            colGroup.insertBefore(cloned, col);\n            cols.push(cloned);\n          }\n          cols.push(col);\n        }\n        col = col.nextElementSibling;\n      }\n      while (span-- > 0) {\n        col = colGroup.ownerDocument.createElement(\"col\");\n        colGroup.appendChild(col);\n        cols.push(col);\n      }\n    });\n    return cols;\n  }\n\n  private addMissingColElements(\n    cols: Element[],\n    colGroups: Element[],\n    columnCount: number,\n    tableElement: Element,\n  ) {\n    if (cols.length < columnCount) {\n      const colGroup = tableElement.ownerDocument.createElement(\"colgroup\");\n      colGroups.push(colGroup);\n      for (let i = cols.length; i < columnCount; i++) {\n        const col = tableElement.ownerDocument.createElement(\"col\");\n        colGroup.appendChild(col);\n        cols.push(col);\n      }\n    }\n  }\n\n  /**\n   * Measure width of columns and normalize colgroup and col elements so that\n   * each column has a corresponding col element with the width specified.\n   */\n  normalizeColGroups(\n    formattingContext: TableFormattingContext,\n    tableElement: Element,\n    column: Layout.Column,\n  ) {\n    const vertical = formattingContext.vertical;\n    const lastRow = formattingContext.lastRowViewNode;\n    if (!lastRow) {\n      return;\n    }\n    Asserts.assert(lastRow);\n    formattingContext.lastRowViewNode = null;\n    const doc = lastRow.ownerDocument;\n    const fragment = doc.createDocumentFragment();\n\n    // Count columns\n    const columnCount = formattingContext.getColumnCount();\n    if (!(columnCount > 0)) {\n      formattingContext.colGroups = fragment;\n      return;\n    }\n\n    // Measure column widths\n    const colWidths = (formattingContext.colWidths = this.getColumnWidths(\n      lastRow,\n      columnCount,\n      vertical,\n      column.clientLayout,\n    ));\n\n    // Normalize colgroup and col elements\n    const colGroups = this.getColGroupElements(tableElement);\n    const cols = this.normalizeAndGetColElements(colGroups);\n\n    // Add missing col elements for remaining columns\n    this.addMissingColElements(cols, colGroups, columnCount, tableElement);\n\n    // Assign width to col elements\n    cols.forEach((col, i) => {\n      Base.setCSSProperty(\n        col,\n        vertical ? \"height\" : \"width\",\n        `${colWidths[i]}px`,\n      );\n    });\n    colGroups.forEach((colGroup) => {\n      fragment.appendChild(colGroup.cloneNode(true));\n    });\n    formattingContext.colGroups = fragment;\n  }\n\n  doInitialLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getTableFormattingContext(\n      nodeContext.formattingContext,\n    );\n    formattingContext.vertical = nodeContext.vertical;\n    formattingContext.initializeRepetitiveElements(nodeContext.vertical);\n    Asserts.assert(nodeContext.sourceNode);\n    const tableLayoutOption = getTableLayoutOption(nodeContext.sourceNode);\n    clearTableLayoutOptionCache(nodeContext.sourceNode);\n    const frame = Task.newFrame<Vtree.NodeContext>(\n      \"TableLayoutProcessor.doInitialLayout\",\n    );\n    const initialNodeContext = nodeContext.copy();\n    this.layoutEntireTable(nodeContext, column).then((nodeContextAfter) => {\n      const tableElement = nodeContextAfter.viewNode as Element;\n      const tableBBox = column.clientLayout.getElementClientRect(tableElement);\n      let edge = column.vertical ? tableBBox.left : tableBBox.bottom;\n      edge +=\n        (column.vertical ? -1 : 1) *\n        BreakPosition.calculateOffset(\n          nodeContext,\n          column.collectElementsOffset(),\n        ).current;\n      if (\n        !column.isOverflown(edge) &&\n        (!tableLayoutOption || !tableLayoutOption.calculateBreakPositionsInside)\n      ) {\n        column.breakPositions.push(\n          new EntireTableBreakPosition(initialNodeContext),\n        );\n        frame.finish(nodeContextAfter);\n        return;\n      }\n      this.normalizeColGroups(formattingContext, tableElement, column);\n      formattingContext.updateCellSizes(column.clientLayout);\n      frame.finish(null);\n    });\n    return frame.result();\n  }\n\n  addCaptions(\n    formattingContext: TableFormattingContext,\n    rootViewNode: Element,\n    firstChild: Node | null,\n  ) {\n    const captions = formattingContext.captions;\n    captions.forEach((caption, i) => {\n      if (caption) {\n        rootViewNode.insertBefore(caption.viewNode, firstChild);\n        if (caption.side === \"top\") {\n          captions[i] = null;\n        }\n      }\n    });\n  }\n\n  addColGroups(\n    formattingContext: TableFormattingContext,\n    rootViewNode: Element,\n    firstChild: Node | null,\n  ) {\n    if (\n      formattingContext.colGroups &&\n      this.getColGroupElements(rootViewNode).length === 0\n    ) {\n      rootViewNode.insertBefore(\n        formattingContext.colGroups.cloneNode(true),\n        firstChild,\n      );\n    }\n  }\n\n  removeColGroups(\n    formattingContext: TableFormattingContext,\n    rootViewNode: Element,\n  ) {\n    if (formattingContext.colGroups && rootViewNode) {\n      const colGroups = this.getColGroupElements(rootViewNode);\n      if (colGroups) {\n        colGroups.forEach((colGroup) => {\n          rootViewNode.removeChild(colGroup);\n        });\n      }\n    }\n  }\n\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getTableFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const rootViewNode = formattingContext.getRootViewNode(\n      nodeContext,\n    ) as Element;\n    const firstChild = rootViewNode.firstChild;\n    this.addCaptions(formattingContext, rootViewNode, firstChild);\n    this.addColGroups(formattingContext, rootViewNode, firstChild);\n    const strategy = new TableLayoutStrategy(formattingContext, column);\n    const iterator = new LayoutUtil.LayoutIterator(\n      strategy,\n      column.layoutContext,\n    );\n    const frame = Task.newFrame<Vtree.NodeContext>(\n      \"TableFormattingContext.doLayout\",\n    );\n    iterator.iterate(nodeContext).thenFinish(frame);\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  layout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n    leadingEdge: boolean,\n  ): Task.Result<Vtree.NodeContext> {\n    const formattingContext = getTableFormattingContext(\n      nodeContext.formattingContext,\n    );\n    const rootViewNode = formattingContext.getRootViewNode(nodeContext);\n    if (!rootViewNode) {\n      return column.buildDeepElementView(nodeContext);\n    } else {\n      if (leadingEdge) {\n        RepetitiveElementImpl.appendHeaderToAncestors(\n          nodeContext.parent,\n          column,\n        );\n      }\n      return new LayoutRetryer(formattingContext, this).layout(\n        nodeContext,\n        column,\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  createEdgeBreakPosition(\n    position: Vtree.NodeContext,\n    breakOnEdge: string | null,\n    overflows: boolean,\n    columnBlockSize: number,\n  ): LayoutType.BreakPosition {\n    return new BetweenTableRowBreakPosition(\n      position,\n      breakOnEdge,\n      overflows,\n      columnBlockSize,\n    );\n  }\n\n  /**\n   * @override\n   */\n  startNonInlineElementNode(nodeContext: Vtree.NodeContext): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  afterNonInlineElementNode(\n    nodeContext: Vtree.NodeContext,\n    stopAtOverflow: boolean,\n  ): boolean {\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  finishBreak(\n    column: Layout.Column,\n    nodeContext: Vtree.NodeContext,\n    forceRemoveSelf: boolean,\n    endOfColumn: boolean,\n  ): Task.Result<boolean> {\n    const formattingContext = getTableFormattingContext(\n      nodeContext.formattingContext,\n    );\n    if (nodeContext.display === \"table-row\") {\n      Asserts.assert(nodeContext.sourceNode);\n      const rowIndex = formattingContext.findRowIndexBySourceNode(\n        nodeContext.sourceNode,\n      );\n      formattingContext.cellBreakPositions = [];\n      let cells: TableCell[];\n      if (!nodeContext.after) {\n        cells = formattingContext.getCellsFallingOnRow(rowIndex);\n      } else {\n        cells = formattingContext.getRowSpanningCellsOverflowingTheRow(\n          rowIndex,\n        );\n      }\n      if (cells.length) {\n        const frame = Task.newFrame<boolean>(\n          \"TableLayoutProcessor.finishBreak\",\n        );\n        let i = 0;\n        frame\n          .loopWithFrame((loopFrame) => {\n            if (i === cells.length) {\n              loopFrame.breakLoop();\n              return;\n            }\n            const cell = cells[i++];\n            const cellFragment = formattingContext.getCellFragmentOfCell(cell);\n            const breakNodeContext = cellFragment.findAcceptableBreakPosition()\n              .nodeContext;\n            Asserts.assert(breakNodeContext);\n            const cellNodeContext = cellFragment.cellNodeContext;\n            const cellNodePosition = cellNodeContext.toNodePosition();\n            const breakChunkPosition = new VtreeImpl.ChunkPosition(\n              breakNodeContext.toNodePosition(),\n            );\n            formattingContext.cellBreakPositions.push({\n              cellNodePosition,\n              breakChunkPosition,\n              cell,\n            } as BrokenTableCellPosition);\n            const cellViewNode = cellNodeContext.viewNode as HTMLTableCellElement;\n            cellFragment.column.layoutContext.processFragmentedBlockEdge(\n              cellFragment.cellNodeContext,\n            );\n            if (rowIndex < cell.rowIndex + cell.rowSpan - 1) {\n              cellViewNode.rowSpan = rowIndex - cell.rowIndex + 1;\n            }\n            if (!cellFragment.empty) {\n              cellFragment.pseudoColumn\n                .finishBreak(breakNodeContext, false, true)\n                .then(() => {\n                  Asserts.assert(cellFragment);\n                  adjustCellHeight(\n                    cellFragment,\n                    formattingContext,\n                    breakNodeContext,\n                  );\n                  loopFrame.continueLoop();\n                });\n            } else {\n              loopFrame.continueLoop();\n            }\n          })\n          .then(() => {\n            column.clearOverflownViewNodes(nodeContext, false);\n            column.layoutContext.processFragmentedBlockEdge(nodeContext);\n            formattingContext.finishFragment();\n            frame.finish(true);\n          });\n        return frame.result();\n      }\n    }\n    formattingContext.finishFragment();\n    return LayoutProcessor.blockLayoutProcessor.finishBreak(\n      column,\n      nodeContext,\n      forceRemoveSelf,\n      endOfColumn,\n    );\n  }\n\n  /** @override */\n  clearOverflownViewNodes(\n    column: Layout.Column,\n    parentNodeContext: Vtree.NodeContext,\n    nodeContext: Vtree.NodeContext,\n    removeSelf: boolean,\n  ) {\n    LayoutProcessor.BlockLayoutProcessor.prototype.clearOverflownViewNodes(\n      column,\n      parentNodeContext,\n      nodeContext,\n      removeSelf,\n    );\n  }\n}\n\nfunction adjustCellHeight(\n  cellFragment: TableCellFragment,\n  formattingContext: TableFormattingContext,\n  breakNodeContext: Vtree.NodeContext,\n): void {\n  const repetitiveElements = formattingContext.getRepetitiveElements();\n  if (!repetitiveElements) {\n    return;\n  }\n  const vertical = formattingContext.vertical;\n  const column = cellFragment.column;\n  const cellContentElement = cellFragment.pseudoColumn.getColumnElement();\n  const cellElement = cellFragment.cellNodeContext.viewNode as Element;\n  const cellElementRect = column.clientLayout.getElementClientRect(cellElement);\n  const padding = column.getComputedPaddingBorder(cellElement);\n  if (vertical) {\n    const width =\n      cellElementRect.right -\n      column.footnoteEdge -\n      repetitiveElements.calculateOffset(breakNodeContext) -\n      padding.right;\n    Base.setCSSProperty(cellContentElement, \"max-width\", `${width}px`);\n  } else {\n    const height =\n      column.footnoteEdge -\n      repetitiveElements.calculateOffset(breakNodeContext) -\n      cellElementRect.top -\n      padding.top;\n    Base.setCSSProperty(cellContentElement, \"max-height\", `${height}px`);\n  }\n  Base.setCSSProperty(cellContentElement, \"overflow\", \"hidden\");\n}\n\nexport class LayoutRetryer extends LayoutRetryers.AbstractLayoutRetryer {\n  constructor(\n    private tableFormattingContext: TableFormattingContext,\n    private readonly processor: TableLayoutProcessor,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  resolveLayoutMode(nodeContext: Vtree.NodeContext): LayoutType.LayoutMode {\n    const repetitiveElements = this.tableFormattingContext.getRepetitiveElements();\n    if (!repetitiveElements || !repetitiveElements.doneInitialLayout) {\n      return new LayoutEntireTable(this.tableFormattingContext, this.processor);\n    } else {\n      if (\n        nodeContext.sourceNode ===\n          this.tableFormattingContext.tableSourceNode &&\n        !nodeContext.after\n      ) {\n        if (repetitiveElements) {\n          repetitiveElements.preventSkippingHeader();\n        }\n      }\n      return new LayoutFragmentedTable(\n        this.tableFormattingContext,\n        this.processor,\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  clearNodes(initialPosition: Vtree.NodeContext) {\n    super.clearNodes(initialPosition);\n    const rootViewNode = this.tableFormattingContext.getRootViewNode(\n      initialPosition,\n    );\n    this.processor.removeColGroups(this.tableFormattingContext, rootViewNode);\n  }\n\n  /**\n   * @override\n   */\n  restoreState(nodeContext: Vtree.NodeContext, column: Layout.Column) {\n    super.restoreState(nodeContext, column);\n    this.tableFormattingContext.finishFragment();\n  }\n}\n\nexport class LayoutEntireTable extends RepetitiveElementImpl.LayoutEntireBlock {\n  constructor(\n    formattingContext: TableFormattingContext,\n    public readonly processor: TableLayoutProcessor,\n  ) {\n    super(formattingContext);\n  }\n\n  /**\n   * @override\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    return this.processor.doInitialLayout(nodeContext, column);\n  }\n}\n\nexport class EntireTableBreakPosition extends BreakPosition.EdgeBreakPosition {\n  constructor(tableNodeContext: Vtree.NodeContext) {\n    super(tableNodeContext, null, tableNodeContext.overflow, 0);\n  }\n\n  /**\n   * @override\n   */\n  getMinBreakPenalty(): number {\n    if (!this.isEdgeUpdated) {\n      throw new Error(\"EdgeBreakPosition.prototype.updateEdge not called\");\n    }\n    return (\n      (this.overflows ? 3 : 0) +\n      (this.position.parent ? this.position.parent.breakPenalty : 0)\n    );\n  }\n\n  /**\n   * @override\n   */\n  breakPositionChosen(column: Layout.Column): void {\n    column.fragmentLayoutConstraints.push(\n      new EntireTableLayoutConstraint(this.position.sourceNode),\n    );\n  }\n}\n\nexport class EntireTableLayoutConstraint\n  implements Layout.FragmentLayoutConstraint {\n  flagmentLayoutConstraintType: FragmentLayoutConstraintType = \"EntireTable\";\n\n  constructor(public tableRootNode: Node) {}\n\n  /**\n   * @override\n   */\n  allowLayout(\n    nodeContext: Vtree.NodeContext,\n    overflownNodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): boolean {\n    // If the nodeContext overflows, any EntireTableLayoutConstraint should not\n    // be registered in the first place. See\n    // TableLayoutProcessor.prototype.doInitialLayout.\n    Asserts.assert(!nodeContext.overflow);\n    return false;\n  }\n\n  /**\n   * @override\n   */\n  nextCandidate(nodeContext: Vtree.NodeContext): boolean {\n    return true;\n  }\n\n  /**\n   * @override\n   */\n  postLayout(\n    allowed: boolean,\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: Layout.Column,\n  ) {\n    Asserts.assert(positionAfter.sourceNode);\n    tableLayoutOptionCache.push({\n      root: positionAfter.sourceNode,\n      tableLayoutOption: {\n        calculateBreakPositionsInside: true,\n      } as TableLayoutOption,\n    });\n  }\n\n  /**\n   * @override\n   */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<boolean> {\n    return Task.newResult(true);\n  }\n\n  /**\n   * @override\n   */\n  equalsTo(constraint: Layout.FragmentLayoutConstraint): boolean {\n    return (\n      constraint instanceof EntireTableLayoutConstraint &&\n      constraint.tableRootNode === this.tableRootNode\n    );\n  }\n\n  /**\n   * @override\n   */\n  getPriorityOfFinishBreak(): number {\n    return 0;\n  }\n}\n\nexport class LayoutFragmentedTable extends RepetitiveElementImpl.LayoutFragmentedBlock {\n  constructor(\n    formattingContext: TableFormattingContext,\n    public readonly processor: TableLayoutProcessor,\n  ) {\n    super(formattingContext);\n  }\n\n  /**\n   * @override\n   */\n  doLayout(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<Vtree.NodeContext> {\n    const repetitiveElements = this.formattingContext.getRepetitiveElements();\n    if (\n      repetitiveElements &&\n      !repetitiveElements.isAfterLastContent(nodeContext)\n    ) {\n      const constraint = new TableRowLayoutConstraint(nodeContext);\n      if (\n        !column.fragmentLayoutConstraints.some((c) => constraint.equalsTo(c))\n      ) {\n        column.fragmentLayoutConstraints.unshift(constraint);\n      }\n    }\n    return this.processor.doLayout(nodeContext, column);\n  }\n}\n\nexport class TableRowLayoutConstraint\n  extends RepetitiveElementImpl.RepetitiveElementsOwnerLayoutConstraint\n  implements Table.TableRowLayoutConstraint {\n  flagmentLayoutConstraintType: FragmentLayoutConstraintType = \"TableRow\";\n  cellFragmentLayoutConstraints: {\n    constraints: Layout.FragmentLayoutConstraint[];\n    breakPosition: Vtree.NodeContext;\n  }[] = [];\n\n  constructor(nodeContext: Vtree.NodeContext) {\n    super(nodeContext);\n  }\n\n  /** @override */\n  allowLayout(\n    nodeContext: Vtree.NodeContext,\n    overflownNodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): boolean {\n    const repetitiveElements = this.getRepetitiveElements();\n    if (!repetitiveElements) {\n      return true;\n    }\n    if (column.pseudoParent) {\n      return true;\n    }\n    if (LayoutHelper.isOrphan(this.nodeContext.viewNode)) {\n      return true;\n    }\n    if (!repetitiveElements.isEnableToUpdateState()) {\n      return true;\n    }\n    if (\n      (overflownNodeContext && !nodeContext) ||\n      (nodeContext && nodeContext.overflow)\n    ) {\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /** @override */\n  nextCandidate(nodeContext: Vtree.NodeContext): boolean {\n    const formattingContext = getTableFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    const cellFragmentConstraints = this.collectCellFragmentLayoutConstraints(\n      nodeContext,\n      formattingContext,\n    );\n    if (\n      cellFragmentConstraints.some((entry) =>\n        entry.constraints.some((constraint) =>\n          constraint.nextCandidate(nodeContext),\n        ),\n      )\n    ) {\n      return true;\n    }\n    return super.nextCandidate(nodeContext);\n  }\n\n  /** @override */\n  postLayout(\n    allowed: boolean,\n    positionAfter: Vtree.NodeContext,\n    initialPosition: Vtree.NodeContext,\n    column: Layout.Column,\n  ) {\n    const formattingContext = getTableFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    this.cellFragmentLayoutConstraints = this.collectCellFragmentLayoutConstraints(\n      positionAfter,\n      formattingContext,\n    );\n    this.cellFragmentLayoutConstraints.forEach((entry) => {\n      entry.constraints.forEach((constraint) => {\n        constraint.postLayout(\n          allowed,\n          entry.breakPosition,\n          initialPosition,\n          column,\n        );\n      });\n    });\n    if (!allowed) {\n      const rootViewNode = formattingContext.getRootViewNode(this.nodeContext);\n      new TableLayoutProcessor().removeColGroups(\n        formattingContext,\n        rootViewNode as Element,\n      );\n      this.removeDummyRowNodes(initialPosition);\n    }\n    super.postLayout(allowed, positionAfter, initialPosition, column);\n  }\n\n  /** @override */\n  finishBreak(\n    nodeContext: Vtree.NodeContext,\n    column: Layout.Column,\n  ): Task.Result<boolean> {\n    const formattingContext = getTableFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    const frame: Task.Frame<boolean> = Task.newFrame(\"finishBreak\");\n    const constraints = this.cellFragmentLayoutConstraints.reduce(\n      (array, entry) =>\n        array.concat(\n          entry.constraints.map((constraint) => ({\n            constraint,\n            breakPosition: entry.breakPosition,\n          })),\n        ),\n      [],\n    );\n    let i = 0;\n    frame\n      .loop(() => {\n        if (i < constraints.length) {\n          const entry = constraints[i++];\n          return entry.constraint\n            .finishBreak(entry.breakPosition, column)\n            .thenReturn(true);\n        } else {\n          return Task.newResult(false);\n        }\n      })\n      .then(() => {\n        frame.finish(true);\n      });\n    return frame\n      .result()\n      .thenAsync(() => super.finishBreak(nodeContext, column));\n  }\n\n  removeDummyRowNodes(nodeContext: Vtree.NodeContext) {\n    if (\n      !nodeContext ||\n      nodeContext.display !== \"table-row\" ||\n      !nodeContext.viewNode\n    ) {\n      return;\n    }\n    while ((nodeContext.viewNode as Element).previousElementSibling) {\n      const dummyNode = (nodeContext.viewNode as Element)\n        .previousElementSibling;\n      if (dummyNode.parentNode) {\n        dummyNode.parentNode.removeChild(dummyNode);\n      }\n    }\n  }\n\n  private collectCellFragmentLayoutConstraints(\n    nodeContext: Vtree.NodeContext,\n    formattingContext: TableFormattingContext,\n  ): {\n    constraints: Layout.FragmentLayoutConstraint[];\n    breakPosition: Vtree.NodeContext;\n  }[] {\n    return this.getCellFragemnts(nodeContext, formattingContext).map(\n      (entry) => ({\n        constraints: entry.fragment.pseudoColumn.getColumn()\n          .fragmentLayoutConstraints,\n        breakPosition: entry.breakPosition,\n      }),\n    );\n  }\n\n  private getCellFragemnts(\n    nodeContext: Vtree.NodeContext,\n    formattingContext: TableFormattingContext,\n  ): { fragment: TableCellFragment; breakPosition: Vtree.NodeContext }[] {\n    let rowIndex = Number.MAX_VALUE;\n    if (nodeContext && nodeContext.display === \"table-row\") {\n      Asserts.assert(nodeContext.sourceNode);\n      rowIndex =\n        formattingContext.findRowIndexBySourceNode(nodeContext.sourceNode) + 1;\n    }\n    rowIndex = Math.min(formattingContext.cellFragments.length, rowIndex);\n    const cellFragments = [];\n    for (let i = 0; i < rowIndex; i++) {\n      if (!formattingContext.cellFragments[i]) {\n        continue;\n      }\n      formattingContext.cellFragments[i].forEach((cellFragment) => {\n        if (!cellFragment) {\n          return;\n        }\n        cellFragments.push({\n          fragment: cellFragment,\n          breakPosition: cellFragment.findAcceptableBreakPosition().nodeContext,\n        });\n      });\n    }\n    return cellFragments;\n  }\n\n  getElementsOffsetsForTableCell(\n    column: Layout.Column,\n  ): RepetitiveElement.ElementsOffset[] {\n    const formattingContext = getTableFormattingContext(\n      this.nodeContext.formattingContext,\n    );\n    const position = formattingContext.findCellFromColumn(column);\n    if (position) {\n      return formattingContext.collectElementsOffsetOfUpperCells(position);\n    } else {\n      return formattingContext.collectElementsOffsetOfHighestColumn();\n    }\n  }\n\n  /** @override */\n  equalsTo(constraint: Layout.FragmentLayoutConstraint): boolean {\n    if (!(constraint instanceof TableRowLayoutConstraint)) {\n      return false;\n    }\n    return (\n      getTableFormattingContext(this.nodeContext.formattingContext) ===\n      getTableFormattingContext(constraint.nodeContext.formattingContext)\n    );\n  }\n}\n\nconst tableLayoutProcessor = new TableLayoutProcessor();\n\nfunction resolveFormattingContextHook(\n  nodeContext: Vtree.NodeContext,\n  firstTime: boolean,\n  display: Css.Ident,\n  position: Css.Ident,\n  floatSide: Css.Ident,\n  isRoot: boolean,\n): TableFormattingContext | null {\n  if (!firstTime) {\n    return null;\n  }\n  if (display === Css.ident.table) {\n    const parent = nodeContext.parent;\n    return new TableFormattingContext(\n      parent ? parent.formattingContext : null,\n      nodeContext.sourceNode as Element,\n    );\n  }\n  return null;\n}\n\nfunction resolveLayoutProcessor(\n  formattingContext,\n): TableLayoutProcessor | null {\n  if (formattingContext instanceof TableFormattingContext) {\n    return tableLayoutProcessor;\n  }\n  return null;\n}\n\nPlugin.registerHook(\n  Plugin.HOOKS.RESOLVE_FORMATTING_CONTEXT,\n  resolveFormattingContextHook,\n);\n\nPlugin.registerHook(\n  Plugin.HOOKS.RESOLVE_LAYOUT_PROCESSOR,\n  resolveLayoutProcessor,\n);\n","/**\n * Copyright 2017 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview MathUtil - Math utilities\n */\nexport function mean(array: number[]): number {\n  return array.reduce((prev, curr) => prev + curr, 0) / array.length;\n}\n\nexport function variance(array: number[]): number {\n  const meanValue = mean(array);\n  return mean(\n    array.map((x) => {\n      const d = x - meanValue;\n      return d * d;\n    }),\n  );\n}\n","/**\n * Copyright 2017 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Columns - Control column layout.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Css from \"./css\";\nimport * as MathUtil from \"./math-util\";\nimport * as PageFloats from \"./page-floats\";\nimport * as Task from \"./task\";\nimport * as Vtree from \"./vtree\";\nimport { Layout } from \"./types\";\n\nexport type ColumnLayoutResult = {\n  columns: Layout.Column[];\n  position: Vtree.LayoutPosition;\n  columnPageFloatLayoutContexts?: PageFloats.PageFloatLayoutContext[];\n};\n\nexport type ColumnGenerator = () => Task.Result<ColumnLayoutResult | null>;\n\nexport class ColumnBalancingTrialResult {\n  constructor(\n    public readonly layoutResult: ColumnLayoutResult,\n    public readonly penalty: number,\n  ) {}\n}\n\nfunction getBlockSize(container: Vtree.Container): number {\n  if (container.vertical) {\n    return container.width;\n  } else {\n    return container.height;\n  }\n}\n\nfunction setBlockSize(container: Vtree.Container, size: number) {\n  if (container.vertical) {\n    container.width = size;\n  } else {\n    container.height = size;\n  }\n}\n\nexport abstract class ColumnBalancer {\n  originalContainerBlockSize: number;\n\n  constructor(\n    public readonly layoutContainer: Vtree.Container,\n    public readonly columnGenerator: ColumnGenerator,\n    public readonly regionPageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ) {\n    this.originalContainerBlockSize = getBlockSize(layoutContainer);\n  }\n\n  balanceColumns(\n    layoutResult: ColumnLayoutResult,\n  ): Task.Result<ColumnLayoutResult> {\n    const self = this;\n    const frame: Task.Frame<ColumnLayoutResult> = Task.newFrame(\n      \"ColumnBalancer#balanceColumns\",\n    );\n    self.preBalance(layoutResult);\n    self.savePageFloatLayoutContexts(layoutResult);\n    self.layoutContainer.clear();\n    const candidates = [self.createTrialResult(layoutResult)];\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (!self.hasNextCandidate(candidates)) {\n          loopFrame.breakLoop();\n          return;\n        }\n        self.updateCondition(candidates);\n        self.columnGenerator().then((layoutResult) => {\n          self.savePageFloatLayoutContexts(layoutResult);\n          self.layoutContainer.clear();\n          if (!layoutResult) {\n            loopFrame.breakLoop();\n            return;\n          }\n          candidates.push(self.createTrialResult(layoutResult));\n          loopFrame.continueLoop();\n        });\n      })\n      .then(() => {\n        const result = candidates.reduce(\n          (prev, curr) => (curr.penalty < prev.penalty ? curr : prev),\n          candidates[0],\n        );\n        self.restoreContents(result.layoutResult);\n        self.postBalance();\n        frame.finish(result.layoutResult);\n      });\n    return frame.result();\n  }\n\n  private createTrialResult(\n    layoutResult: ColumnLayoutResult,\n  ): ColumnBalancingTrialResult {\n    const penalty = this.calculatePenalty(layoutResult);\n    return new ColumnBalancingTrialResult(layoutResult, penalty);\n  }\n\n  protected preBalance(layoutResult: ColumnLayoutResult) {}\n\n  protected abstract calculatePenalty(layoutResult: ColumnLayoutResult): number;\n\n  protected abstract hasNextCandidate(\n    candidates: ColumnBalancingTrialResult[],\n  ): boolean;\n\n  protected abstract updateCondition(\n    candidates: ColumnBalancingTrialResult[],\n  ): void;\n\n  protected postBalance() {\n    setBlockSize(this.layoutContainer, this.originalContainerBlockSize);\n  }\n\n  savePageFloatLayoutContexts(layoutResult: ColumnLayoutResult | null) {\n    const children = this.regionPageFloatLayoutContext.detachChildren();\n    if (layoutResult) {\n      layoutResult.columnPageFloatLayoutContexts = children;\n    }\n  }\n\n  private restoreContents(newLayoutResult: ColumnLayoutResult) {\n    const parent = this.layoutContainer.element;\n    newLayoutResult.columns.forEach((c) => {\n      parent.appendChild(c.element);\n    });\n    Asserts.assert(newLayoutResult.columnPageFloatLayoutContexts);\n    this.regionPageFloatLayoutContext.attachChildren(\n      newLayoutResult.columnPageFloatLayoutContexts,\n    );\n  }\n}\nconst COLUMN_LENGTH_STEP = 1;\n\nexport function canReduceContainerSize(\n  candidates: ColumnBalancingTrialResult[],\n): boolean {\n  const lastCandidate = candidates[candidates.length - 1];\n  if (lastCandidate.penalty === 0) {\n    return false;\n  }\n  const secondLastCandidate = candidates[candidates.length - 2];\n  if (\n    secondLastCandidate &&\n    lastCandidate.penalty >= secondLastCandidate.penalty\n  ) {\n    return false;\n  }\n  const columns = lastCandidate.layoutResult.columns;\n  const maxColumnBlockSize = Math.max.apply(\n    null,\n    columns.map((c) => c.computedBlockSize),\n  );\n  const maxPageFloatBlockSize = Math.max.apply(\n    null,\n    columns.map((c) => c.getMaxBlockSizeOfPageFloats()),\n  );\n  return maxColumnBlockSize > maxPageFloatBlockSize + COLUMN_LENGTH_STEP;\n}\n\nexport function reduceContainerSize(\n  candidates: ColumnBalancingTrialResult[],\n  container: Vtree.Container,\n): void {\n  const columns = candidates[candidates.length - 1].layoutResult.columns;\n  const maxColumnBlockSize = Math.max.apply(\n    null,\n    columns.map((c) => {\n      if (!isNaN(c.blockDistanceToBlockEndFloats)) {\n        return (\n          c.computedBlockSize -\n          c.blockDistanceToBlockEndFloats +\n          COLUMN_LENGTH_STEP\n        );\n      } else {\n        return c.computedBlockSize;\n      }\n    }),\n  );\n  const newEdge = maxColumnBlockSize - COLUMN_LENGTH_STEP;\n  if (newEdge < getBlockSize(container)) {\n    setBlockSize(container, newEdge);\n  } else {\n    setBlockSize(container, getBlockSize(container) - 1);\n  }\n}\n\nexport class BalanceLastColumnBalancer extends ColumnBalancer {\n  originalPosition: Vtree.LayoutPosition | null = null;\n  foundUpperBound: boolean = false;\n\n  constructor(\n    columnGenerator: ColumnGenerator,\n    regionPageFloatLayoutContext,\n    layoutContainer: Vtree.Container,\n    public readonly columnCount: number,\n  ) {\n    super(layoutContainer, columnGenerator, regionPageFloatLayoutContext);\n  }\n\n  /**\n   * @override\n   */\n  preBalance(layoutResult: ColumnLayoutResult) {\n    const columns = layoutResult.columns;\n    const totalBlockSize = columns.reduce(\n      (prev, c) => prev + c.computedBlockSize,\n      0,\n    );\n    setBlockSize(this.layoutContainer, totalBlockSize / this.columnCount);\n    this.originalPosition = layoutResult.position;\n  }\n\n  private checkPosition(position: Vtree.LayoutPosition | null): boolean {\n    if (this.originalPosition) {\n      return this.originalPosition.isSamePosition(position);\n    } else {\n      return position === null;\n    }\n  }\n\n  /**\n   * @override\n   */\n  calculatePenalty(layoutResult: ColumnLayoutResult): number {\n    if (!this.checkPosition(layoutResult.position)) {\n      return Infinity;\n    }\n    const columns = layoutResult.columns;\n    if (isLastColumnLongerThanAnyOtherColumn(columns)) {\n      return Infinity;\n    }\n    return Math.max.apply(\n      null,\n      columns.map((c) => c.computedBlockSize),\n    );\n  }\n\n  /**\n   * @override\n   */\n  hasNextCandidate(candidates: ColumnBalancingTrialResult[]): boolean {\n    if (candidates.length === 1) {\n      return true;\n    } else if (this.foundUpperBound) {\n      return canReduceContainerSize(candidates);\n    } else {\n      const lastCandidate = candidates[candidates.length - 1];\n      if (this.checkPosition(lastCandidate.layoutResult.position)) {\n        if (\n          !isLastColumnLongerThanAnyOtherColumn(\n            lastCandidate.layoutResult.columns,\n          )\n        ) {\n          this.foundUpperBound = true;\n          return true;\n        }\n      }\n      return (\n        getBlockSize(this.layoutContainer) < this.originalContainerBlockSize\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  updateCondition(candidates: ColumnBalancingTrialResult[]): void {\n    if (this.foundUpperBound) {\n      reduceContainerSize(candidates, this.layoutContainer);\n    } else {\n      const newEdge = Math.min(\n        this.originalContainerBlockSize,\n        getBlockSize(this.layoutContainer) +\n          this.originalContainerBlockSize * 0.1,\n      );\n      setBlockSize(this.layoutContainer, newEdge);\n    }\n  }\n}\n\nfunction isLastColumnLongerThanAnyOtherColumn(\n  columns: Layout.Column[],\n): boolean {\n  if (columns.length <= 1) {\n    return false;\n  }\n  const lastColumnBlockSize = columns[columns.length - 1].computedBlockSize;\n  const otherColumns = columns.slice(0, columns.length - 1);\n  return otherColumns.every((c) => lastColumnBlockSize > c.computedBlockSize);\n}\n\nexport class BalanceNonLastColumnBalancer extends ColumnBalancer {\n  constructor(\n    columnGenerator: ColumnGenerator,\n    regionPageFloatLayoutContext,\n    layoutContainer: Vtree.Container,\n  ) {\n    super(layoutContainer, columnGenerator, regionPageFloatLayoutContext);\n  }\n\n  /**\n   * @override\n   */\n  calculatePenalty(layoutResult: ColumnLayoutResult): number {\n    if (layoutResult.columns.every((c) => c.computedBlockSize === 0)) {\n      return Infinity;\n    }\n    const computedBlockSizes = layoutResult.columns\n      .filter((c) => !c.pageBreakType)\n      .map((c) => c.computedBlockSize);\n    return MathUtil.variance(computedBlockSizes);\n  }\n\n  /**\n   * @override\n   */\n  hasNextCandidate(candidates: ColumnBalancingTrialResult[]): boolean {\n    return canReduceContainerSize(candidates);\n  }\n\n  /**\n   * @override\n   */\n  updateCondition(candidates: ColumnBalancingTrialResult[]): void {\n    reduceContainerSize(candidates, this.layoutContainer);\n  }\n}\n\nexport function createColumnBalancer(\n  columnCount: number,\n  columnFill: Css.Ident,\n  columnGenerator: ColumnGenerator,\n  regionPageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  layoutContainer: Vtree.Container,\n  columns: Layout.Column[],\n  flowPosition: Vtree.FlowPosition,\n): ColumnBalancer | null {\n  if (columnFill === Css.ident.auto) {\n    return null;\n  } else {\n    // TODO: how to handle a case where no more in-flow contents but some\n    // page floats\n    const noMoreContent = flowPosition.positions.length === 0;\n    const lastColumn = columns[columns.length - 1];\n    const isLastColumnForceBroken = !!(lastColumn && lastColumn.pageBreakType);\n    if (noMoreContent || isLastColumnForceBroken) {\n      return new BalanceLastColumnBalancer(\n        columnGenerator,\n        regionPageFloatLayoutContext,\n        layoutContainer,\n        columnCount,\n      );\n    } else if (columnFill === Css.ident.balance_all) {\n      return new BalanceNonLastColumnBalancer(\n        columnGenerator,\n        regionPageFloatLayoutContext,\n        layoutContainer,\n      );\n    } else {\n      Asserts.assert(columnFill === Css.ident.balance);\n      return null;\n    }\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssStyler - Apply CSS cascade to a document incrementally and\n * cache the result.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Break from \"./break\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssValidator from \"./css-validator\";\nimport * as Display from \"./display\";\nimport * as Exprs from \"./exprs\";\nimport * as Vtree from \"./vtree\";\nimport { CssStyler, XmlDoc } from \"./types\";\n\nexport class SlipRange {\n  endStuckFixed: number;\n  endFixed: number;\n  endSlipped: number;\n\n  constructor(endStuckFixed, endFixed, endSlipped) {\n    this.endStuckFixed = endStuckFixed;\n    this.endFixed = endFixed;\n    this.endSlipped = endSlipped;\n  }\n}\n\n/**\n * Maps all ints in a range (\"fixed\") to ints with slippage (\"slipped\")\n */\nexport class SlipMap {\n  map = [] as SlipRange[];\n\n  getMaxFixed(): number {\n    if (this.map.length == 0) {\n      return 0;\n    }\n    const range = this.map[this.map.length - 1];\n    return range.endFixed;\n  }\n\n  getMaxSlipped(): number {\n    if (this.map.length == 0) {\n      return 0;\n    }\n    const range = this.map[this.map.length - 1];\n    return range.endSlipped;\n  }\n\n  addStuckRange(endFixed: number): void {\n    if (this.map.length == 0) {\n      this.map.push(new SlipRange(endFixed, endFixed, endFixed));\n    } else {\n      const range = this.map[this.map.length - 1];\n      const endSlipped = range.endSlipped + endFixed - range.endFixed;\n      if (range.endFixed == range.endStuckFixed) {\n        range.endFixed = endFixed;\n        range.endStuckFixed = endFixed;\n        range.endSlipped = endSlipped;\n      } else {\n        this.map.push(new SlipRange(endFixed, endFixed, endSlipped));\n      }\n    }\n  }\n\n  addSlippedRange(endFixed: number): void {\n    if (this.map.length == 0) {\n      this.map.push(new SlipRange(endFixed, 0, 0));\n    } else {\n      this.map[this.map.length - 1].endFixed = endFixed;\n    }\n  }\n\n  slippedByFixed(fixed: number): number {\n    const self = this;\n    const index = Base.binarySearch(\n      this.map.length,\n      (index) => fixed <= self.map[index].endFixed,\n    );\n    const range = this.map[index];\n    return range.endSlipped - Math.max(0, range.endStuckFixed - fixed);\n  }\n\n  /**\n   * Smallest fixed for a given slipped.\n   */\n  fixedBySlipped(slipped: number): number {\n    const self = this;\n    const index = Base.binarySearch(\n      this.map.length,\n      (index) => slipped <= self.map[index].endSlipped,\n    );\n    const range = this.map[index];\n    return range.endStuckFixed - (range.endSlipped - slipped);\n  }\n}\n\nexport interface FlowListener {\n  /**\n   * @return void\n   */\n  encounteredFlowChunk(flowChunk: Vtree.FlowChunk, flow: Vtree.Flow): any;\n}\n\nexport interface AbstractStyler extends CssStyler.AbstractStyler {}\n\n/**\n * Represent a box generated by a (pseudo)element. When constructed, a box\n * corresponding to `::before` pseudoelement is also constructed and stored in\n * `beforeBox` property, whereas one corresponding `::after` pseudoelement is\n * not constructed and `afterBox` property is `null`. `afterBox` is constructed\n * by `buildAfterPseudoElementBox` method.\n * @param style Cascaded style values for the box.\n * @param offset The start offset of the box. It coincides with the start offset\n *     of the element if the box is generated by the element or the `::before`\n *     pseudoelement. When the box corresponds to the `::after` pseudoelement,\n *     the offset is just after the content before the `::after` pseudoelement.\n * @param isRoot True if the box is generated by the root element (not\n *     pseudoelement).\n * @param flowChunk FlowChunk to which the box belongs to.\n * @param atBlockStart True if the box is right after the block start edge.\n * @param atFlowStart True if the box is right after the flow start.\n * @param isParentBoxDisplayed True if the parent box has a displayed box.\n */\nexport class Box {\n  flowName: string;\n  isBlockValue: boolean | null = null;\n  hasBoxValue: boolean | null = null;\n  styleValues = {} as { [key: string]: Css.Val };\n  beforeBox: Box = null;\n  afterBox: Box = null;\n  breakBefore: string | null = null;\n\n  constructor(\n    public readonly context: Exprs.Context,\n    public readonly style: CssCascade.ElementStyle,\n    public readonly offset: number,\n    public readonly isRoot: boolean,\n    public readonly flowChunk: Vtree.FlowChunk,\n    public readonly atBlockStart: boolean,\n    public readonly atFlowStart: boolean,\n    public readonly isParentBoxDisplayed: boolean,\n  ) {\n    this.flowName = flowChunk.flowName;\n    if (this.hasBox()) {\n      const pseudoMap = style[\"_pseudos\"];\n      if (pseudoMap) {\n        if (pseudoMap[\"before\"]) {\n          const beforeBox = new Box(\n            context,\n            pseudoMap[\"before\"],\n            offset,\n            false,\n            flowChunk,\n            this.isBlock(),\n            atFlowStart,\n            true,\n          );\n          const beforeContent = beforeBox.styleValue(\"content\");\n          if (Vtree.nonTrivialContent(beforeContent)) {\n            this.beforeBox = beforeBox;\n            this.breakBefore = beforeBox.breakBefore;\n          }\n        }\n      }\n    }\n    this.breakBefore = Break.resolveEffectiveBreakValue(\n      this.getBreakValue(\"before\"),\n      this.breakBefore,\n    );\n    if (this.atFlowStart && Break.isForcedBreakValue(this.breakBefore)) {\n      flowChunk.breakBefore = Break.resolveEffectiveBreakValue(\n        flowChunk.breakBefore,\n        this.breakBefore,\n      );\n    }\n  }\n\n  /**\n   * Build a box corresponding to `::after` pseudoelement and stores it in\n   * `afterBox` property.\n   * @param offset The start offset of the `::after` pseudoelement box, which is\n   *     just after the content before the `::after` pseudoelement.\n   * @param atBlockStart True if the box is right after the block start edge.\n   * @param atFlowStart True if the box is right after the flow start.\n   */\n  buildAfterPseudoElementBox(\n    offset: number,\n    atBlockStart: boolean,\n    atFlowStart: boolean,\n  ) {\n    if (this.hasBox()) {\n      const pseudoMap = this.style[\"_pseudos\"];\n      if (pseudoMap) {\n        if (pseudoMap[\"after\"]) {\n          const afterBox = new Box(\n            this.context,\n            pseudoMap[\"after\"],\n            offset,\n            false,\n            this.flowChunk,\n            atBlockStart,\n            atFlowStart,\n            true,\n          );\n          const afterContent = afterBox.styleValue(\"content\");\n          if (Vtree.nonTrivialContent(afterContent)) {\n            this.afterBox = afterBox;\n          }\n        }\n      }\n    }\n  }\n\n  styleValue(name: string, defaultValue?: Css.Val): Css.Val | null {\n    if (!(name in this.styleValues)) {\n      const cv = this.style[name];\n      this.styleValues[name] = cv\n        ? cv.evaluate(this.context, name)\n        : defaultValue || null;\n    }\n    return this.styleValues[name];\n  }\n\n  displayValue(): Css.Val {\n    return this.styleValue(\"display\", Css.ident.inline);\n  }\n\n  isBlock(): boolean {\n    if (this.isBlockValue === null) {\n      const display = this.displayValue() as Css.Ident;\n      const position = this.styleValue(\"position\") as Css.Ident;\n      const float = this.styleValue(\"float\") as Css.Ident;\n      this.isBlockValue = Display.isBlock(\n        display,\n        position,\n        float,\n        this.isRoot,\n      );\n    }\n    return this.isBlockValue;\n  }\n\n  hasBox(): boolean {\n    if (this.hasBoxValue === null) {\n      this.hasBoxValue =\n        this.isParentBoxDisplayed && this.displayValue() !== Css.ident.none;\n    }\n    return this.hasBoxValue;\n  }\n\n  getBreakValue(edge: string): string | null {\n    let breakValue: string | null = null;\n    if (this.isBlock()) {\n      const val = this.styleValue(`break-${edge}`);\n      if (val) {\n        breakValue = val.toString();\n      }\n    }\n    return breakValue;\n  }\n}\n\n/**\n * Manages boxes generated by elements as a stack.\n */\nexport class BoxStack {\n  stack = [] as Box[];\n  atBlockStart: boolean = true; // indicates if the next pushed box will be at the block start\n  atFlowStart: boolean = true; // indicates if the next pushed box will be at the flow start\n  atStartStack = [] as { atBlockStart: boolean; atFlowStart: boolean }[]; // pushed when a new flow starts\n\n  constructor(public readonly context: Exprs.Context) {}\n\n  /**\n   * Returns if the stack is empty.\n   */\n  empty(): boolean {\n    return this.stack.length === 0;\n  }\n\n  /**\n   * Returns the last box in the stack.\n   */\n  lastBox(): Box | undefined {\n    return this.stack[this.stack.length - 1];\n  }\n\n  /**\n   * Returns the flow name of the last box in the stack.\n   */\n  lastFlowName(): string | null {\n    const lastBox = this.lastBox();\n    return lastBox ? lastBox.flowChunk.flowName : null;\n  }\n\n  /**\n   * Returns if the last box in the stack is displayed.\n   */\n  isCurrentBoxDisplayed(): boolean {\n    return this.stack.every((box) => box.displayValue() !== Css.ident.none);\n  }\n\n  /**\n   * Create a new box and push it to the stack.\n   * @param style Cascaded style values for the box.\n   * @param offset The start offset of the box.\n   * @param isRoot True if the box is generated by the root element\n   * @param newFlowChunk Specify if the element is a flow element (i.e. the\n   *     element is specified a new `flow-into` value)\n   */\n  push(\n    style: CssCascade.ElementStyle,\n    offset: number,\n    isRoot: boolean,\n    newFlowChunk?: Vtree.FlowChunk,\n  ): Box {\n    const lastBox = this.lastBox();\n    if (newFlowChunk && lastBox && newFlowChunk.flowName !== lastBox.flowName) {\n      this.atStartStack.push({\n        atBlockStart: this.atBlockStart,\n        atFlowStart: this.atFlowStart,\n      });\n    }\n    const flowChunk = newFlowChunk || lastBox.flowChunk;\n    const isAtFlowStart = this.atFlowStart || !!newFlowChunk;\n    const isParentBoxDisplayed = this.isCurrentBoxDisplayed();\n    const box = new Box(\n      this.context,\n      style,\n      offset,\n      isRoot,\n      flowChunk,\n      isAtFlowStart || this.atBlockStart,\n      isAtFlowStart,\n      isParentBoxDisplayed,\n    );\n    this.stack.push(box);\n    this.atBlockStart = box.hasBox()\n      ? !box.beforeBox && box.isBlock()\n      : this.atBlockStart;\n    this.atFlowStart = box.hasBox()\n      ? !box.beforeBox && isAtFlowStart\n      : this.atFlowStart;\n    return box;\n  }\n\n  encounteredTextNode(node: Node) {\n    const box = this.lastBox();\n    if ((this.atBlockStart || this.atFlowStart) && box.hasBox()) {\n      const whitespaceValue = box\n        .styleValue(\"white-space\", Css.ident.normal)\n        .toString();\n      const whitespace = Vtree.whitespaceFromPropertyValue(whitespaceValue);\n      Asserts.assert(whitespace !== null);\n      if (!Vtree.canIgnore(node, whitespace)) {\n        this.atBlockStart = false;\n        this.atFlowStart = false;\n      }\n    }\n  }\n\n  /**\n   * Pop the last box.\n   */\n  pop(offset: number): Box {\n    const box = this.stack.pop();\n    box.buildAfterPseudoElementBox(offset, this.atBlockStart, this.atFlowStart);\n    if (this.atFlowStart && box.afterBox) {\n      const breakBefore = box.afterBox.getBreakValue(\"before\");\n      box.flowChunk.breakBefore = Break.resolveEffectiveBreakValue(\n        box.flowChunk.breakBefore,\n        breakBefore,\n      );\n    }\n    const parent = this.lastBox();\n    if (parent) {\n      if (parent.flowName === box.flowName) {\n        if (box.hasBox()) {\n          this.atBlockStart = this.atFlowStart = false;\n        }\n      } else {\n        const atStart = this.atStartStack.pop();\n        this.atBlockStart = atStart.atBlockStart;\n        this.atFlowStart = atStart.atFlowStart;\n      }\n    }\n    return box;\n  }\n\n  /**\n   * Find the start offset of the nearest block start edge to which the\n   * `break-before` value of the box should be propagated. This method can be\n   * called when after pushing the box into the stack or after popping the box\n   * out of the stack.\n   */\n  nearestBlockStartOffset(box: Box): number {\n    if (!box.atBlockStart) {\n      return box.offset;\n    }\n    let i = this.stack.length - 1;\n    let parent = this.stack[i];\n\n    // When called just after the box is popped out, the last box in the stack\n    // is different from the box and it is the parent of the box. When called\n    // after the box is pushed, the last box in the stack is identical to the\n    // box and the parent of the box is a box right before the specified box.\n    if (parent === box) {\n      i--;\n      parent = this.stack[i];\n    }\n    while (i >= 0) {\n      if (parent.flowName !== box.flowName) {\n        return box.offset;\n      }\n      if (!parent.atBlockStart) {\n        return parent.offset;\n      }\n      if (parent.isRoot) {\n        return parent.offset;\n      }\n      box = parent;\n      parent = this.stack[--i];\n    }\n    throw new Error(\"No block start offset found!\");\n  }\n}\n\nexport class Styler implements AbstractStyler {\n  root: Element;\n  cascadeHolder: CssCascade.Cascade;\n  last: Node;\n  rootStyle = {} as CssCascade.ElementStyle;\n  styleMap: { [key: string]: CssCascade.ElementStyle } = {};\n  flows = {} as { [key: string]: Vtree.Flow };\n  flowChunks = [] as Vtree.FlowChunk[];\n  flowListener: FlowListener = null;\n  flowToReach: string | null = null;\n  idToReach: string | null = null;\n  cascade: CssCascade.CascadeInstance;\n  offsetMap: SlipMap;\n  primary: boolean = true;\n  primaryStack = [] as boolean[];\n  rootBackgroundAssigned: boolean = false;\n  rootLayoutAssigned: boolean = false;\n  lastOffset: number;\n  breakBeforeValues = {} as { [key: number]: string | null };\n  boxStack: BoxStack;\n  bodyReached: boolean = true;\n\n  constructor(\n    public readonly xmldoc: XmlDoc.XMLDocHolder,\n    cascade: CssCascade.Cascade,\n    public readonly scope: Exprs.LexicalScope,\n    public readonly context: Exprs.Context,\n    public readonly primaryFlows: { [key: string]: boolean },\n    public readonly validatorSet: CssValidator.ValidatorSet,\n    public readonly counterListener: CssCascade.CounterListener,\n    counterResolver: CssCascade.CounterResolver,\n  ) {\n    this.root = xmldoc.root;\n    this.cascadeHolder = cascade;\n    this.last = this.root;\n    this.cascade = cascade.createInstance(\n      context,\n      counterListener,\n      counterResolver,\n      xmldoc.lang,\n    );\n    this.offsetMap = new SlipMap();\n    const rootOffset = xmldoc.getElementOffset(this.root);\n    this.lastOffset = rootOffset;\n    this.boxStack = new BoxStack(context);\n    this.offsetMap.addStuckRange(rootOffset);\n    const style = this.getAttrStyle(this.root);\n    this.cascade.pushElement(this.root, style, rootOffset);\n    this.postprocessTopStyle(style, false);\n    switch (this.root.namespaceURI) {\n      case Base.NS.XHTML:\n      case Base.NS.FB2:\n        this.bodyReached = false;\n        break;\n    }\n    this.primaryStack.push(true);\n    this.styleMap = {};\n    this.styleMap[`e${rootOffset}`] = style;\n    this.lastOffset++;\n    this.replayFlowElementsFromOffset(-1);\n  }\n\n  hasProp(\n    style: CssCascade.ElementStyle,\n    map: CssValidator.ValueMap,\n    name: string,\n  ): boolean {\n    const cascVal = style[name];\n    return cascVal && cascVal.evaluate(this.context) !== map[name];\n  }\n\n  transferPropsToRoot(\n    srcStyle: CssCascade.ElementStyle,\n    map: CssValidator.ValueMap,\n  ): void {\n    for (const pname in map) {\n      const cascval = srcStyle[pname];\n      if (cascval) {\n        this.rootStyle[pname] = cascval;\n        delete srcStyle[pname];\n      } else {\n        const val = map[pname];\n        if (val) {\n          this.rootStyle[pname] = new CssCascade.CascadeValue(\n            val,\n            CssParser.SPECIFICITY_AUTHOR,\n          );\n        }\n      }\n    }\n  }\n\n  /**\n   * Transfer properties that should be applied on the container (partition)\n   * level to this.rootStyle.\n   * @param elemStyle (source) element style\n   */\n  postprocessTopStyle(\n    elemStyle: CssCascade.ElementStyle,\n    isBody: boolean,\n  ): void {\n    [\"writing-mode\", \"direction\"].forEach((propName) => {\n      if (elemStyle[propName] && !(isBody && this.rootStyle[propName])) {\n        // Copy it over, but keep it at the root element as well.\n        this.rootStyle[propName] = elemStyle[propName];\n      }\n    });\n    if (!this.rootBackgroundAssigned) {\n      const backgroundColor = this.hasProp(\n        elemStyle,\n        this.validatorSet.backgroundProps,\n        \"background-color\",\n      )\n        ? elemStyle[\"background-color\"].evaluate(this.context)\n        : (null as Css.Val);\n      const backgroundImage = this.hasProp(\n        elemStyle,\n        this.validatorSet.backgroundProps,\n        \"background-image\",\n      )\n        ? elemStyle[\"background-image\"].evaluate(this.context)\n        : (null as Css.Val);\n      if (\n        (backgroundColor && backgroundColor !== Css.ident.inherit) ||\n        (backgroundImage && backgroundImage !== Css.ident.inherit)\n      ) {\n        this.transferPropsToRoot(elemStyle, this.validatorSet.backgroundProps);\n        this.rootBackgroundAssigned = true;\n      }\n    }\n    if (!this.rootLayoutAssigned) {\n      for (let i = 0; i < columnProps.length; i++) {\n        if (\n          this.hasProp(elemStyle, this.validatorSet.layoutProps, columnProps[i])\n        ) {\n          this.transferPropsToRoot(elemStyle, this.validatorSet.layoutProps);\n          this.rootLayoutAssigned = true;\n          break;\n        }\n      }\n    }\n    if (!isBody) {\n      const fontSize = elemStyle[\"font-size\"];\n      if (fontSize) {\n        const val = fontSize.evaluate(this.context);\n        let px = val.num;\n        switch (val.unit) {\n          case \"em\":\n          case \"rem\":\n            px *= this.context.initialFontSize;\n            break;\n          case \"ex\":\n            px *=\n              (this.context.initialFontSize * Exprs.defaultUnitSizes[\"ex\"]) /\n              Exprs.defaultUnitSizes[\"em\"];\n            break;\n          case \"%\":\n            px *= this.context.initialFontSize / 100;\n            break;\n          default: {\n            const unitSize = Exprs.defaultUnitSizes[val.unit];\n            if (unitSize) {\n              px *= unitSize;\n            }\n          }\n        }\n        this.context.rootFontSize = px;\n      }\n    }\n  }\n\n  getTopContainerStyle(): CssCascade.ElementStyle {\n    let offset = 0;\n    while (!this.bodyReached) {\n      offset += 5000;\n      if (this.styleUntil(offset, 0) == Number.POSITIVE_INFINITY) {\n        break;\n      }\n    }\n    return this.rootStyle;\n  }\n\n  getAttrStyle(elem: Element): CssCascade.ElementStyle {\n    // skip cases in which elements for XML other than HTML or SVG\n    // have 'style' attribute not for CSS declaration\n    if ((elem as any).style instanceof CSSStyleDeclaration) {\n      const styleAttrValue = elem.getAttribute(\"style\");\n      if (styleAttrValue) {\n        return CssCascade.parseStyleAttribute(\n          this.scope,\n          this.validatorSet,\n          this.xmldoc.url,\n          styleAttrValue,\n        );\n      }\n    }\n    return {} as CssCascade.ElementStyle;\n  }\n\n  /**\n   * @return currently reached offset\n   */\n  getReachedOffset(): number {\n    return this.lastOffset;\n  }\n\n  /**\n   * Replay flow elements that were encountered since the given offset\n   */\n  replayFlowElementsFromOffset(offset: number): void {\n    if (offset >= this.lastOffset) {\n      return;\n    }\n    const context = this.context;\n    const rootOffset = this.xmldoc.getElementOffset(this.root);\n    if (offset < rootOffset) {\n      const rootStyle = this.getStyle(this.root, false);\n      Asserts.assert(rootStyle);\n      const flowName = CssCascade.getProp(rootStyle, \"flow-into\");\n      const flowNameStr = flowName\n        ? flowName.evaluate(context, \"flow-into\").toString()\n        : \"body\";\n      const newFlowChunk = this.encounteredFlowElement(\n        flowNameStr,\n        rootStyle,\n        this.root,\n        rootOffset,\n      );\n      if (this.boxStack.empty()) {\n        this.boxStack.push(rootStyle, rootOffset, true, newFlowChunk);\n      }\n    }\n    let node = this.xmldoc.getNodeByOffset(offset);\n    let nodeOffset = this.xmldoc.getNodeOffset(node, 0, false);\n    if (nodeOffset >= this.lastOffset) {\n      return;\n    }\n    while (true) {\n      if (node.nodeType != 1) {\n        nodeOffset += node.textContent.length;\n      } else {\n        const elem = node as Element;\n        if (VIVLIOSTYLE_DEBUG) {\n          if (nodeOffset != this.xmldoc.getElementOffset(elem)) {\n            throw new Error(\"Inconsistent offset\");\n          }\n        }\n        const style = this.getStyle(elem, false);\n        const flowName = style[\"flow-into\"];\n        if (flowName) {\n          const flowNameStr = flowName\n            .evaluate(context, \"flow-into\")\n            .toString();\n          this.encounteredFlowElement(flowNameStr, style, elem, nodeOffset);\n        }\n        nodeOffset++;\n      }\n      if (nodeOffset >= this.lastOffset) {\n        break;\n      }\n      let next: Node = node.firstChild;\n      if (next == null) {\n        while (true) {\n          next = node.nextSibling;\n          if (next) {\n            break;\n          }\n          node = node.parentNode;\n          if (node === this.root) {\n            return;\n          }\n        }\n      }\n      node = next;\n    }\n  }\n\n  resetFlowChunkStream(flowListener: FlowListener): void {\n    this.flowListener = flowListener;\n    for (let i = 0; i < this.flowChunks.length; i++) {\n      this.flowListener.encounteredFlowChunk(\n        this.flowChunks[i],\n        this.flows[this.flowChunks[i].flowName],\n      );\n    }\n  }\n\n  styleUntilFlowIsReached(flowName: string) {\n    this.flowToReach = flowName;\n    let offset = 0;\n    while (true) {\n      if (this.flowToReach == null) {\n        break;\n      }\n      offset += 5000;\n      if (this.styleUntil(offset, 0) == Number.POSITIVE_INFINITY) {\n        break;\n      }\n    }\n  }\n\n  styleUntilIdIsReached(id: string) {\n    if (!id) {\n      return;\n    }\n    this.idToReach = id;\n    let offset = 0;\n    while (true) {\n      if (!this.idToReach) {\n        break;\n      }\n      offset += 5000;\n      if (this.styleUntil(offset, 0) === Number.POSITIVE_INFINITY) {\n        break;\n      }\n    }\n    this.idToReach = null;\n  }\n\n  private encounteredFlowElement(\n    flowName: string,\n    style: CssCascade.ElementStyle,\n    elem: Element,\n    startOffset: number,\n  ): Vtree.FlowChunk {\n    let priority = 0;\n    let linger = Number.POSITIVE_INFINITY;\n    let exclusive = false;\n    let repeated = false;\n    let last = false;\n    const optionsCV = style[\"flow-options\"];\n    if (optionsCV) {\n      const options = CssProp.toSet(\n        optionsCV.evaluate(this.context, \"flow-options\"),\n      );\n      exclusive = !!options[\"exclusive\"];\n      repeated = !!options[\"static\"];\n      last = !!options[\"last\"];\n    }\n    const lingerCV = style[\"flow-linger\"];\n    if (lingerCV) {\n      linger = CssProp.toInt(\n        lingerCV.evaluate(this.context, \"flow-linger\"),\n        Number.POSITIVE_INFINITY,\n      );\n    }\n    const priorityCV = style[\"flow-priority\"];\n    if (priorityCV) {\n      priority = CssProp.toInt(\n        priorityCV.evaluate(this.context, \"flow-priority\"),\n        0,\n      );\n    }\n    const breakBefore = this.breakBeforeValues[startOffset] || null;\n    let flow = this.flows[flowName];\n    if (!flow) {\n      const parentFlowName = this.boxStack.lastFlowName();\n      flow = this.flows[flowName] = new Vtree.Flow(flowName, parentFlowName);\n    }\n    const flowChunk = new Vtree.FlowChunk(\n      flowName,\n      elem,\n      startOffset,\n      priority,\n      linger,\n      exclusive,\n      repeated,\n      last,\n      breakBefore,\n    );\n    this.flowChunks.push(flowChunk);\n    if (this.flowToReach == flowName) {\n      this.flowToReach = null;\n    }\n    if (this.flowListener) {\n      this.flowListener.encounteredFlowChunk(flowChunk, flow);\n    }\n    return flowChunk;\n  }\n\n  registerForcedBreakOffset(\n    breakValue: string | null,\n    offset: number,\n    flowName: string,\n  ) {\n    if (Break.isForcedBreakValue(breakValue)) {\n      const forcedBreakOffsets = this.flows[flowName].forcedBreakOffsets;\n      if (\n        forcedBreakOffsets.length === 0 ||\n        forcedBreakOffsets[forcedBreakOffsets.length - 1] < offset\n      ) {\n        forcedBreakOffsets.push(offset);\n      }\n    }\n    const previousValue = this.breakBeforeValues[offset];\n    this.breakBeforeValues[offset] = Break.resolveEffectiveBreakValue(\n      previousValue,\n      breakValue,\n    );\n  }\n\n  /**\n   * @param startOffset current position in the document\n   * @param lookup lookup window size for the next page\n   * @return lookup offset in the document for the next page\n   */\n  styleUntil(startOffset: number, lookup: number): number {\n    let targetSlippedOffset = -1;\n    let slippedOffset: number;\n    if (startOffset <= this.lastOffset) {\n      slippedOffset = this.offsetMap.slippedByFixed(startOffset);\n      targetSlippedOffset = slippedOffset + lookup;\n      if (targetSlippedOffset < this.offsetMap.getMaxSlipped()) {\n        // got to the desired point\n        return this.offsetMap.fixedBySlipped(targetSlippedOffset);\n      }\n    }\n    if (this.last == null) {\n      return Number.POSITIVE_INFINITY;\n    }\n    const context = this.context;\n    while (true) {\n      let next: Node = this.last.firstChild;\n      if (next == null) {\n        while (true) {\n          if (this.last.nodeType == 1) {\n            this.cascade.popElement(this.last as Element);\n            this.primary = this.primaryStack.pop();\n            const box = this.boxStack.pop(this.lastOffset);\n            let breakAfter: string | null = null;\n            if (box.afterBox) {\n              const afterPseudoBreakBefore = box.afterBox.getBreakValue(\n                \"before\",\n              );\n              this.registerForcedBreakOffset(\n                afterPseudoBreakBefore,\n                box.afterBox.atBlockStart\n                  ? this.boxStack.nearestBlockStartOffset(box)\n                  : box.afterBox.offset,\n                box.flowName,\n              );\n              breakAfter = box.afterBox.getBreakValue(\"after\");\n            }\n            breakAfter = Break.resolveEffectiveBreakValue(\n              breakAfter,\n              box.getBreakValue(\"after\"),\n            );\n            this.registerForcedBreakOffset(\n              breakAfter,\n              this.lastOffset,\n              box.flowName,\n            );\n          }\n          next = this.last.nextSibling;\n          if (next) {\n            break;\n          }\n          this.last = this.last.parentNode;\n          if (this.last === this.root) {\n            this.last = null;\n            if (startOffset < this.lastOffset) {\n              if (targetSlippedOffset < 0) {\n                slippedOffset = this.offsetMap.slippedByFixed(startOffset);\n                targetSlippedOffset = slippedOffset + lookup;\n              }\n              if (targetSlippedOffset <= this.offsetMap.getMaxSlipped()) {\n                // got to the desired point\n                return this.offsetMap.fixedBySlipped(targetSlippedOffset);\n              }\n            }\n            return Number.POSITIVE_INFINITY;\n          }\n        }\n      }\n      this.last = next;\n      if (this.last.nodeType != 1) {\n        this.lastOffset += this.last.textContent.length;\n        this.boxStack.encounteredTextNode(this.last);\n        if (this.primary) {\n          this.offsetMap.addStuckRange(this.lastOffset);\n        } else {\n          this.offsetMap.addSlippedRange(this.lastOffset);\n        }\n      } else {\n        const elem = this.last as Element;\n        const style = this.getAttrStyle(elem);\n        this.primaryStack.push(this.primary);\n        this.cascade.pushElement(elem, style, this.lastOffset);\n        const id =\n          elem.getAttribute(\"id\") || elem.getAttributeNS(Base.NS.XML, \"id\");\n        if (id && id === this.idToReach) {\n          this.idToReach = null;\n        }\n        if (\n          !this.bodyReached &&\n          elem.localName == \"body\" &&\n          elem.parentNode == this.root\n        ) {\n          this.postprocessTopStyle(style, true);\n          this.bodyReached = true;\n        }\n        let box: Box;\n        const flowName = style[\"flow-into\"];\n        if (flowName) {\n          const flowNameStr = flowName\n            .evaluate(context, \"flow-into\")\n            .toString();\n          const newFlowChunk = this.encounteredFlowElement(\n            flowNameStr,\n            style,\n            elem,\n            this.lastOffset,\n          );\n          this.primary = !!this.primaryFlows[flowNameStr];\n          box = this.boxStack.push(\n            style,\n            this.lastOffset,\n            elem === this.root,\n            newFlowChunk,\n          );\n        } else {\n          box = this.boxStack.push(style, this.lastOffset, elem === this.root);\n        }\n        const blockStartOffset = this.boxStack.nearestBlockStartOffset(box);\n        this.registerForcedBreakOffset(\n          box.breakBefore,\n          blockStartOffset,\n          box.flowName,\n        );\n        if (box.beforeBox) {\n          const beforePseudoBreakAfter = box.beforeBox.getBreakValue(\"after\");\n          this.registerForcedBreakOffset(\n            beforePseudoBreakAfter,\n            box.beforeBox.atBlockStart ? blockStartOffset : box.offset,\n            box.flowName,\n          );\n        }\n        if (this.primary) {\n          if (box.displayValue() === Css.ident.none) {\n            this.primary = false;\n          }\n        }\n        if (VIVLIOSTYLE_DEBUG) {\n          const offset = this.xmldoc.getElementOffset(this.last as Element);\n          if (offset != this.lastOffset) {\n            throw new Error(\"Inconsistent offset\");\n          }\n        }\n        this.styleMap[`e${this.lastOffset}`] = style;\n        this.lastOffset++;\n        if (this.primary) {\n          this.offsetMap.addStuckRange(this.lastOffset);\n        } else {\n          this.offsetMap.addSlippedRange(this.lastOffset);\n        }\n        if (startOffset < this.lastOffset) {\n          if (targetSlippedOffset < 0) {\n            slippedOffset = this.offsetMap.slippedByFixed(startOffset);\n            targetSlippedOffset = slippedOffset + lookup;\n          }\n          if (targetSlippedOffset <= this.offsetMap.getMaxSlipped()) {\n            // got to the desired point\n            return this.offsetMap.fixedBySlipped(targetSlippedOffset);\n          }\n        }\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  getStyle(element: Element, deep: boolean): CssCascade.ElementStyle {\n    let offset = this.xmldoc.getElementOffset(element);\n    const key = `e${offset}`;\n    if (deep) {\n      offset = this.xmldoc.getNodeOffset(element, 0, true);\n    }\n    if (this.lastOffset <= offset) {\n      this.styleUntil(offset, 0);\n    }\n    return this.styleMap[key];\n  }\n\n  /**\n   * @override\n   */\n  processContent(element: Element, styles: { [key: string]: Css.Val }) {}\n}\n\nexport const columnProps = [\"column-count\", \"column-width\", \"column-fill\"];\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssValidator - Parse validation rules (validation.txt), validate\n * properties and shorthands.\n */\nimport * as Css from \"./css\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as Logging from \"./logging\";\nimport ValidationTxt from \"./assets/validation.txt\";\n\nexport interface PropertyReceiver {\n  unknownProperty(name: string, value: Css.Val): void;\n\n  invalidPropertyValue(name: string, value: Css.Val): void;\n\n  simpleProperty(name: string, value: Css.Val, important): void;\n}\n\nexport class Node {\n  success: Node = null;\n  failure: Node = null;\n  code: number = 0;\n\n  constructor(public validator: PropertyValidator) {}\n\n  isSpecial(): boolean {\n    return this.code != 0;\n  }\n\n  markAsStartGroup(): void {\n    this.code = -1;\n  }\n\n  isStartGroup(): boolean {\n    return this.code == -1;\n  }\n\n  markAsEndGroup(): void {\n    this.code = -2;\n  }\n\n  isEndGroup(): boolean {\n    return this.code == -2;\n  }\n\n  markAsStartAlternate(index: number): void {\n    this.code = 2 * index + 1;\n  }\n\n  isStartAlternate(): boolean {\n    return this.code > 0 && this.code % 2 != 0;\n  }\n\n  markAsEndAlternate(index: number): void {\n    this.code = 2 * index + 2;\n  }\n\n  isEndAlternate(): boolean {\n    return this.code > 0 && this.code % 2 == 0;\n  }\n\n  getAlternate(): number {\n    return Math.floor((this.code - 1) / 2);\n  }\n}\n\nexport class Connection {\n  what: number = -1;\n\n  constructor(public where: number, public success: boolean) {}\n}\n\n/**\n * @enum {number}\n */\nexport enum Add {\n  FOLLOW = 1,\n  OPTIONAL,\n  REPEATED,\n  ALTERNATE,\n}\n\n/**\n * A class to build a list validator from other validators.\n */\nexport class ValidatingGroup {\n  nodes: Node[] = [];\n  connections: Connection[] = [];\n  match: number[] = []; // connector indicies\n  nomatch: number[] = []; // connector indicies\n  error: number[] = []; // connector indicies\n  emptyHead: boolean = true;\n\n  connect(arr: number[], nodeIndex: number): void {\n    for (let i = 0; i < arr.length; i++) {\n      this.connections[arr[i]].what = nodeIndex;\n    }\n    arr.splice(0, arr.length);\n  }\n\n  clone(): ValidatingGroup {\n    const group = new ValidatingGroup();\n    for (let i = 0; i < this.nodes.length; i++) {\n      const node = this.nodes[i];\n      const clonedNode = new Node(node.validator);\n      clonedNode.code = node.code;\n      group.nodes.push(clonedNode);\n    }\n    for (let i = 0; i < this.connections.length; i++) {\n      const connection = this.connections[i];\n      const groupConnection = new Connection(\n        connection.where,\n        connection.success,\n      );\n      groupConnection.what = connection.what;\n      group.connections.push(groupConnection);\n    }\n    group.match.push(...this.match);\n    group.nomatch.push(...this.nomatch);\n    group.error.push(...this.error);\n    return group;\n  }\n\n  /**\n   * Add \"special\" validation node to a given array (match, nomatch, or error).\n   * @param start if this a start or the end of a clause/group\n   * @param clause 0 indicates group start/end, otherwise clause index\n   */\n  private addSpecialToArr(arr: number[], start: boolean, clause: number): void {\n    const index = this.nodes.length;\n    const node = new Node(ALWAYS_FAIL);\n    if (clause >= 0) {\n      if (start) {\n        node.markAsStartAlternate(clause);\n      } else {\n        node.markAsEndAlternate(clause);\n      }\n    } else {\n      if (start) {\n        node.markAsStartGroup();\n      } else {\n        node.markAsEndGroup();\n      }\n    }\n    this.nodes.push(node);\n    this.connect(arr, index);\n    const success = new Connection(index, true);\n    const failure = new Connection(index, false);\n    arr.push(this.connections.length);\n    this.connections.push(failure);\n    arr.push(this.connections.length);\n    this.connections.push(success);\n  }\n\n  endSpecialGroup(): void {\n    const arrs = [this.match, this.nomatch, this.error];\n    for (let i = 0; i < arrs.length; i++) {\n      this.addSpecialToArr(arrs[i], false, -1);\n    }\n  }\n\n  startSpecialGroup(): void {\n    if (this.nodes.length) {\n      throw new Error(\"invalid call\");\n    }\n    this.addSpecialToArr(this.match, true, -1);\n  }\n\n  endClause(clause: number): void {\n    this.addSpecialToArr(this.match, false, clause);\n  }\n\n  startClause(clause: number): void {\n    if (this.nodes.length) {\n      throw new Error(\"invalid call\");\n    }\n    const node = new Node(ALWAYS_FAIL);\n    node.markAsStartAlternate(clause);\n    this.nodes.push(node);\n    const success = new Connection(0, true);\n    const failure = new Connection(0, false);\n    this.nomatch.push(this.connections.length);\n    this.connections.push(failure);\n    this.match.push(this.connections.length);\n    this.connections.push(success);\n  }\n\n  addPrimitive(validator: PropertyValidator): void {\n    const index = this.nodes.length;\n    this.nodes.push(new Node(validator));\n    const success = new Connection(index, true);\n    const failure = new Connection(index, false);\n    this.connect(this.match, index);\n    if (this.emptyHead) {\n      // if did not validate -> no match\n      this.nomatch.push(this.connections.length);\n      this.emptyHead = false;\n    } else {\n      // if did not validate -> failure\n      this.error.push(this.connections.length);\n    }\n    this.connections.push(failure);\n    this.match.push(this.connections.length);\n    this.connections.push(success);\n  }\n\n  isSimple(): boolean {\n    return this.nodes.length == 1 && !this.nodes[0].isSpecial();\n  }\n\n  isPrimitive(): boolean {\n    return (\n      this.isSimple() && this.nodes[0].validator instanceof PrimitiveValidator\n    );\n  }\n\n  addGroup(group: ValidatingGroup, how: Add): void {\n    if (group.nodes.length == 0) {\n      return;\n    }\n    const index = this.nodes.length;\n\n    // optimization for alternate primitive validators\n    if (\n      how == Add.ALTERNATE &&\n      index == 1 &&\n      group.isPrimitive() &&\n      this.isPrimitive()\n    ) {\n      this.nodes[0].validator = (this.nodes[0]\n        .validator as PrimitiveValidator).combine(\n        group.nodes[0].validator as PrimitiveValidator,\n      );\n      return;\n    }\n    for (let i = 0; i < group.nodes.length; i++) {\n      this.nodes.push(group.nodes[i]);\n    }\n\n    // nodes[index] is group start\n    if (how == Add.ALTERNATE) {\n      this.emptyHead = true;\n      this.connect(this.nomatch, index);\n    } else {\n      this.connect(this.match, index);\n    }\n    const connectionIndex = this.connections.length;\n    for (let i = 0; i < group.connections.length; i++) {\n      const connection = group.connections[i];\n      connection.where += index;\n      if (connection.what >= 0) {\n        connection.what += index;\n      }\n      this.connections.push(connection);\n    }\n    for (let i = 0; i < group.match.length; i++) {\n      this.match.push(group.match[i] + connectionIndex);\n    }\n    if (how == Add.REPEATED) {\n      this.connect(this.match, index);\n    }\n    if (how == Add.OPTIONAL || how == Add.REPEATED) {\n      for (let i = 0; i < group.nomatch.length; i++) {\n        this.match.push(group.nomatch[i] + connectionIndex);\n      }\n    } else if (this.emptyHead) {\n      for (let i = 0; i < group.nomatch.length; i++) {\n        this.nomatch.push(group.nomatch[i] + connectionIndex);\n      }\n      this.emptyHead = group.emptyHead;\n    } else {\n      for (let i = 0; i < group.nomatch.length; i++) {\n        this.error.push(group.nomatch[i] + connectionIndex);\n      }\n    }\n    for (let i = 0; i < group.error.length; i++) {\n      this.error.push(group.error[i] + connectionIndex);\n    }\n\n    // invalidate group\n    group.nodes = null;\n    group.connections = null;\n  }\n\n  /**\n   * @return how\n   */\n  finish(successTerminal: Node, failTerminal: Node): Node {\n    const index = this.nodes.length;\n    this.nodes.push(successTerminal);\n    this.nodes.push(failTerminal);\n    this.connect(this.match, index);\n    this.connect(this.nomatch, index + 1);\n    this.connect(this.error, index + 1);\n    for (const connection of this.connections) {\n      if (connection.success) {\n        this.nodes[connection.where].success = this.nodes[connection.what];\n      } else {\n        this.nodes[connection.where].failure = this.nodes[connection.what];\n      }\n    }\n\n    // make sure that our data structure is correct\n    for (let j = 0; j < index; j++) {\n      if (this.nodes[j].failure == null || this.nodes[j].success == null) {\n        throw new Error(\"Invalid validator state\");\n      }\n    }\n    return this.nodes[0];\n  }\n}\n\nexport const ALLOW_EMPTY = 1;\n\nexport const ALLOW_STR = 2;\n\nexport const ALLOW_IDENT = 4;\n\nexport const ALLOW_POS_NUMERIC = 8;\n\nexport const ALLOW_POS_NUM = 16;\n\nexport const ALLOW_POS_INT = 32;\n\nexport const ALLOW_COLOR = 64;\n\nexport const ALLOW_URL = 128;\n\nexport const ALLOW_NEGATIVE = 256;\n\nexport const ALLOW_ZERO = 512;\n\nexport const ALLOW_ZERO_PERCENT = 1024;\n\nexport const ALLOW_SLASH = 2048;\n\nexport type ValueMap = {\n  [key: string]: Css.Val;\n};\n\n/**\n * Abstract class to validate simple CSS property value (not a shorthand)\n */\nexport class PropertyValidator extends Css.Visitor {\n  constructor() {\n    super();\n  }\n\n  /**\n   * Validate a subsequence of the given values from the given index. Return the\n   * list of matched values or null if there is no match.\n   */\n  validateForShorthand(values: Css.Val[], index: number): Css.Val[] {\n    const rval = values[index].visit(this);\n    if (rval) {\n      return [rval];\n    }\n    return null;\n  }\n}\n\n/**\n * Validate a primitive CSS value (not a list or function).\n * @param allowed mask of ALLOW_*** constants.\n */\nexport class PrimitiveValidator extends PropertyValidator {\n  constructor(\n    public readonly allowed: number,\n    public readonly idents: ValueMap,\n    public readonly units: ValueMap,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  visitEmpty(empty: Css.Val): Css.Val {\n    if (this.allowed & ALLOW_EMPTY) {\n      return empty;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitSlash(slash: Css.Val): Css.Val {\n    if (this.allowed & ALLOW_SLASH) {\n      return slash;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitStr(str: Css.Str): Css.Val {\n    if (this.allowed & ALLOW_STR) {\n      return str;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    const val = this.idents[ident.name.toLowerCase()];\n    if (val) {\n      return val;\n    }\n    if (this.allowed & ALLOW_IDENT) {\n      return ident;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Css.Numeric): Css.Val {\n    if (numeric.num == 0 && !(this.allowed & ALLOW_ZERO)) {\n      if (numeric.unit == \"%\" && this.allowed & ALLOW_ZERO_PERCENT) {\n        return numeric;\n      }\n      return null;\n    }\n    if (numeric.num < 0 && !(this.allowed & ALLOW_NEGATIVE)) {\n      return null;\n    }\n    if (this.units[numeric.unit]) {\n      return numeric;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitNum(num: Css.Num): Css.Val {\n    if (num.num == 0) {\n      return this.allowed & ALLOW_ZERO ? num : null;\n    }\n    if (num.num <= 0 && !(this.allowed & ALLOW_NEGATIVE)) {\n      return null;\n    }\n    if (this.allowed & ALLOW_POS_NUM) {\n      return num;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitInt(num: Css.Int): Css.Val {\n    if (num.num == 0) {\n      return this.allowed & ALLOW_ZERO ? num : null;\n    }\n    if (num.num <= 0 && !(this.allowed & ALLOW_NEGATIVE)) {\n      return null;\n    }\n    if (this.allowed & (ALLOW_POS_INT | ALLOW_POS_NUM)) {\n      return num;\n    }\n    const val = this.idents[`${num.num}`];\n    if (val) {\n      return val;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitColor(color: Css.Color): Css.Val {\n    if (this.allowed & ALLOW_COLOR) {\n      return color;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitURL(url: Css.URL): Css.Val {\n    if (this.allowed & ALLOW_URL) {\n      return url;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitExpr(expr: Css.Expr): Css.Val {\n    if (this.allowed & 0x7fe) {\n      // ALLOW_STR|ALLOW_IDENT|...|ALLOW_ZERO_PERCENT\n      return expr;\n    }\n    return null;\n  }\n\n  combine(other: PrimitiveValidator): PrimitiveValidator {\n    const idents: ValueMap = {};\n    const units: ValueMap = {};\n    for (const ident in this.idents) {\n      idents[ident] = this.idents[ident];\n    }\n    for (const ident in other.idents) {\n      idents[ident] = other.idents[ident];\n    }\n    for (const unit in this.units) {\n      units[unit] = this.units[unit];\n    }\n    for (const unit in other.units) {\n      units[unit] = other.units[unit];\n    }\n    return new PrimitiveValidator(this.allowed | other.allowed, idents, units);\n  }\n}\n\nconst NO_IDENTS = {};\n\nexport const ALWAYS_FAIL = new PrimitiveValidator(0, NO_IDENTS, NO_IDENTS);\n\n/**\n * Base class for list validation.\n */\nexport class ListValidator extends PropertyValidator {\n  successTerminal: Node;\n  failureTerminal: Node;\n  first: Node;\n\n  constructor(group: ValidatingGroup) {\n    super();\n    this.successTerminal = new Node(null);\n    this.failureTerminal = new Node(null);\n    this.first = group.finish(this.successTerminal, this.failureTerminal);\n  }\n\n  validateList(arr: Css.Val[], slice: boolean, startIndex: number): Css.Val[] {\n    let out: Css.Val[] = slice ? [] : arr;\n    let current = this.first;\n    let index = startIndex;\n    let alternativeStack: string[][] = null;\n    let alternatives: string[] = null;\n    while (\n      current !== this.successTerminal &&\n      current !== this.failureTerminal\n    ) {\n      if (index >= arr.length) {\n        current = current.failure;\n        continue;\n      }\n      const inval = arr[index];\n      let outval = inval;\n      if (current.isSpecial()) {\n        let success = true;\n        if (current.isStartGroup()) {\n          if (alternativeStack) {\n            alternativeStack.push(alternatives);\n          } else {\n            alternativeStack = [alternatives];\n          }\n          alternatives = [];\n        } else if (current.isEndGroup()) {\n          if (alternativeStack.length > 0) {\n            alternatives = alternativeStack.pop();\n          } else {\n            alternatives = null;\n          }\n        } else if (current.isEndAlternate()) {\n          alternatives[current.getAlternate()] = \"taken\";\n        } else {\n          success = alternatives[current.getAlternate()] == null;\n        }\n        current = success ? current.success : current.failure;\n      } else {\n        if (\n          index == 0 &&\n          !slice &&\n          current.validator instanceof SpaceListValidator &&\n          this instanceof SpaceListValidator\n        ) {\n          // Special nesting case: validate the input space list as a whole.\n          outval = new Css.SpaceList(arr).visit(current.validator);\n          if (outval) {\n            index = arr.length;\n            current = current.success;\n            continue;\n          }\n        } else if (\n          index == 0 &&\n          !slice &&\n          current.validator instanceof CommaListValidator &&\n          this instanceof SpaceListValidator\n        ) {\n          // Special nesting case: validate the input comma list as a whole.\n          outval = new Css.CommaList(arr).visit(current.validator);\n          if (outval) {\n            index = arr.length;\n            current = current.success;\n            continue;\n          }\n        } else {\n          outval = inval.visit(current.validator);\n        }\n        if (!outval) {\n          current = current.failure;\n          continue;\n        }\n        if (outval !== inval && arr === out) {\n          // startIndex is zero here\n          out = [];\n          for (let k = 0; k < index; k++) {\n            out[k] = arr[k];\n          }\n        }\n        if (arr !== out) {\n          out[index - startIndex] = outval;\n        }\n        index++;\n        current = current.success;\n      }\n    }\n    if (current === this.successTerminal) {\n      if (slice ? out.length > 0 : index == arr.length) {\n        return out;\n      }\n    }\n    return null;\n  }\n\n  validateSingle(inval: Css.Val): Css.Val {\n    // no need to worry about \"specials\"\n    let outval: Css.Val = null;\n    let current = this.first;\n    while (\n      current !== this.successTerminal &&\n      current !== this.failureTerminal\n    ) {\n      if (!inval) {\n        current = current.failure;\n        continue;\n      }\n      if (current.isSpecial()) {\n        current = current.success;\n        continue;\n      }\n      outval = inval.visit(current.validator);\n      if (!outval) {\n        current = current.failure;\n        continue;\n      }\n      inval = null;\n      current = current.success;\n    }\n    if (current === this.successTerminal) {\n      return outval;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitEmpty(empty: Css.Val): Css.Val {\n    return this.validateSingle(empty);\n  }\n\n  /**\n   * @override\n   */\n  visitSlash(slash: Css.Val): Css.Val {\n    return this.validateSingle(slash);\n  }\n\n  /**\n   * @override\n   */\n  visitStr(str: Css.Str): Css.Val {\n    return this.validateSingle(str);\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    return this.validateSingle(ident);\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Css.Numeric): Css.Val {\n    return this.validateSingle(numeric);\n  }\n\n  /**\n   * @override\n   */\n  visitNum(num: Css.Num): Css.Val {\n    return this.validateSingle(num);\n  }\n\n  /**\n   * @override\n   */\n  visitInt(num: Css.Int): Css.Val {\n    return this.validateSingle(num);\n  }\n\n  /**\n   * @override\n   */\n  visitColor(color: Css.Color): Css.Val {\n    return this.validateSingle(color);\n  }\n\n  /**\n   * @override\n   */\n  visitURL(url: Css.URL): Css.Val {\n    return this.validateSingle(url);\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    return this.validateSingle(func);\n  }\n\n  /**\n   * @override\n   */\n  visitExpr(expr: Css.Expr): Css.Val {\n    return null;\n  }\n}\n\nexport class SpaceListValidator extends ListValidator {\n  constructor(group: ValidatingGroup) {\n    super(group);\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    const arr = this.validateList(list.values, false, 0);\n    if (arr === list.values) {\n      return list;\n    }\n    if (!arr) {\n      return null;\n    }\n    return new Css.SpaceList(arr);\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    // Special Case : Issue #156\n    let node = this.first;\n    let hasCommaListValidator = false;\n    while (node) {\n      if (node.validator instanceof CommaListValidator) {\n        hasCommaListValidator = true;\n        break;\n      }\n      node = node.failure;\n    }\n    if (hasCommaListValidator) {\n      const arr = this.validateList(list.values, false, 0);\n      if (arr === list.values) {\n        return list;\n      }\n      if (!arr) {\n        return null;\n      }\n      return new Css.CommaList(arr);\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  validateForShorthand(values: Css.Val[], index: number): Css.Val[] {\n    return this.validateList(values, true, index);\n  }\n}\n\nexport class CommaListValidator extends ListValidator {\n  constructor(group: ValidatingGroup) {\n    super(group);\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    return this.validateSingle(list);\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    const arr = this.validateList(list.values, false, 0);\n    if (arr === list.values) {\n      return list;\n    }\n    if (!arr) {\n      return null;\n    }\n    return new Css.CommaList(arr);\n  }\n\n  /**\n   * @override\n   */\n  validateForShorthand(values: Css.Val[], index: number): Css.Val[] {\n    let current = this.first;\n    let rval: Css.Val[];\n    while (current !== this.failureTerminal) {\n      rval = current.validator.validateForShorthand(values, index);\n      if (rval) {\n        return rval;\n      }\n      current = current.failure;\n    }\n    return null;\n  }\n}\n\nexport class FuncValidator extends ListValidator {\n  constructor(public readonly name: string, group: ValidatingGroup) {\n    super(group);\n  }\n\n  /**\n   * @override\n   */\n  validateSingle(inval: Css.Val): Css.Val {\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    if (func.name.toLowerCase() != this.name) {\n      return null;\n    }\n    const arr = this.validateList(func.values, false, 0);\n    if (arr === func.values) {\n      return func;\n    }\n    if (!arr) {\n      return null;\n    }\n    return new Css.Func(func.name, arr);\n  }\n}\n\n//----------------------- Shorthands\n//------------------------------------------------------------\nexport class ShorthandSyntaxNode {\n  /**\n   * @return new index.\n   */\n  tryParse(\n    values: Css.Val[],\n    index: number,\n    shorthandValidator: ShorthandValidator,\n  ): number {\n    return index;\n  }\n\n  success(rval: Css.Val, shorthandValidator: ShorthandValidator): void {}\n}\n\nexport class ShorthandSyntaxProperty extends ShorthandSyntaxNode {\n  validator: PropertyValidator;\n\n  constructor(validatorSet: ValidatorSet, public readonly name: string) {\n    super();\n    this.validator = validatorSet.validators[this.name];\n  }\n\n  /**\n   * @override\n   */\n  tryParse(\n    values: Css.Val[],\n    index: number,\n    shorthandValidator: ShorthandValidator,\n  ): number {\n    if (shorthandValidator.values[this.name]) {\n      return index;\n    }\n    const rvals = this.validator.validateForShorthand(values, index);\n    if (rvals) {\n      const len = rvals.length;\n      const rval = len > 1 ? new Css.SpaceList(rvals) : rvals[0];\n      this.success(rval, shorthandValidator);\n      return index + len;\n    }\n    return index;\n  }\n\n  /**\n   * @override\n   */\n  success(rval: Css.Val, shorthandValidator: ShorthandValidator): void {\n    shorthandValidator.values[this.name] = rval;\n  }\n}\n\nexport class ShorthandSyntaxPropertyN extends ShorthandSyntaxProperty {\n  constructor(validatorSet: ValidatorSet, public readonly names: string[]) {\n    super(validatorSet, names[0]);\n  }\n\n  /**\n   * @override\n   */\n  success(rval: Css.Val, shorthandValidator: ShorthandValidator): void {\n    for (let i = 0; i < this.names.length; i++) {\n      shorthandValidator.values[this.names[i]] = rval;\n    }\n  }\n}\n\nexport class ShorthandSyntaxCompound extends ShorthandSyntaxNode {\n  constructor(\n    public readonly nodes: ShorthandSyntaxNode[],\n    public readonly slash: boolean,\n  ) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  tryParse(\n    values: Css.Val[],\n    index: number,\n    shorthandValidator: ShorthandValidator,\n  ): number {\n    const index0 = index;\n    if (this.slash) {\n      if (values[index] == Css.slash) {\n        if (++index == values.length) {\n          return index0;\n        }\n      } else {\n        return index0;\n      }\n    }\n    let newIndex = this.nodes[0].tryParse(values, index, shorthandValidator);\n    if (newIndex == index) {\n      return index0;\n    }\n    index = newIndex;\n    for (let i = 1; i < this.nodes.length && index < values.length; i++) {\n      newIndex = this.nodes[i].tryParse(values, index, shorthandValidator);\n      if (newIndex == index) {\n        break;\n      }\n      index = newIndex;\n    }\n    return index;\n  }\n}\n\nexport class ShorthandValidator extends Css.Visitor {\n  syntax: ShorthandSyntaxNode[] = null;\n  propList: string[] = null;\n  error: boolean = false;\n  values: ValueMap = {};\n  validatorSet: ValidatorSet = null;\n\n  setOwner(validatorSet: ValidatorSet) {\n    this.validatorSet = validatorSet;\n  }\n\n  syntaxNodeForProperty(name: string): ShorthandSyntaxNode {\n    return new ShorthandSyntaxProperty(this.validatorSet, name);\n  }\n\n  clone(): this {\n    const other = new (this.constructor as any)();\n    other.syntax = this.syntax;\n    other.propList = this.propList;\n    other.validatorSet = this.validatorSet;\n    return other;\n  }\n\n  init(syntax: ShorthandSyntaxNode[], propList: string[]): void {\n    this.syntax = syntax;\n    this.propList = propList;\n  }\n\n  finish(important: boolean, receiver: PropertyReceiver): boolean {\n    if (!this.error) {\n      for (const name of this.propList) {\n        receiver.simpleProperty(\n          name,\n          this.values[name] || this.validatorSet.defaultValues[name],\n          important,\n        );\n      }\n      return true;\n    }\n    return false;\n  }\n\n  propagateInherit(important: boolean, receiver: PropertyReceiver): void {\n    for (const name of this.propList) {\n      receiver.simpleProperty(name, Css.ident.inherit, important);\n    }\n  }\n\n  validateList(list: Css.Val[]): number {\n    this.error = true;\n    return 0;\n  }\n\n  validateSingle(val: Css.Val): Css.Val {\n    this.validateList([val]);\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitEmpty(empty: Css.Val): Css.Val {\n    return this.validateSingle(empty);\n  }\n\n  /**\n   * @override\n   */\n  visitStr(str: Css.Str): Css.Val {\n    return this.validateSingle(str);\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    return this.validateSingle(ident);\n  }\n\n  /**\n   * @override\n   */\n  visitNumeric(numeric: Css.Numeric): Css.Val {\n    return this.validateSingle(numeric);\n  }\n\n  /**\n   * @override\n   */\n  visitNum(num: Css.Num): Css.Val {\n    return this.validateSingle(num);\n  }\n\n  /**\n   * @override\n   */\n  visitInt(num: Css.Int): Css.Val {\n    return this.validateSingle(num);\n  }\n\n  /**\n   * @override\n   */\n  visitColor(color: Css.Color): Css.Val {\n    return this.validateSingle(color);\n  }\n\n  /**\n   * @override\n   */\n  visitURL(url: Css.URL): Css.Val {\n    return this.validateSingle(url);\n  }\n\n  /**\n   * @override\n   */\n  visitSpaceList(list: Css.SpaceList): Css.Val {\n    this.validateList(list.values);\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    this.error = true;\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitFunc(func: Css.Func): Css.Val {\n    return this.validateSingle(func);\n  }\n\n  /**\n   * @override\n   */\n  visitExpr(expr: Css.Expr): Css.Val {\n    this.error = true;\n    return null;\n  }\n}\n\nexport class SimpleShorthandValidator extends ShorthandValidator {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  validateList(list: Css.Val[]): number {\n    let index = 0;\n    let i = 0;\n    while (index < list.length) {\n      const newIndex = this.syntax[i].tryParse(list, index, this);\n      if (newIndex > index) {\n        index = newIndex;\n        i = 0;\n        continue;\n      }\n      if (++i == this.syntax.length) {\n        this.error = true;\n        break;\n      }\n    }\n    return index;\n  }\n}\n\nexport class InsetsShorthandValidator extends ShorthandValidator {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  validateList(list: Css.Val[]): number {\n    if (list.length > this.syntax.length || list.length == 0) {\n      this.error = true;\n      return 0;\n    }\n    for (let i = 0; i < this.syntax.length; i++) {\n      let index = i;\n      while (index >= list.length) {\n        index = index == 1 ? 0 : index - 2;\n      }\n      if (this.syntax[i].tryParse(list, index, this) != index + 1) {\n        this.error = true;\n        return 0;\n      }\n    }\n    return list.length;\n  }\n\n  createSyntaxNode(): ShorthandSyntaxPropertyN {\n    return new ShorthandSyntaxPropertyN(this.validatorSet, this.propList);\n  }\n}\n\nexport class InsetsSlashShorthandValidator extends ShorthandValidator {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  validateList(list: Css.Val[]): number {\n    let slashIndex = list.length;\n    for (let i = 0; i < list.length; i++) {\n      if (list[i] === Css.slash) {\n        slashIndex = i;\n        break;\n      }\n    }\n    if (slashIndex > this.syntax.length || list.length == 0) {\n      this.error = true;\n      return 0;\n    }\n    for (let i = 0; i < this.syntax.length; i++) {\n      let index0 = i;\n      while (index0 >= slashIndex) {\n        index0 = index0 == 1 ? 0 : index0 - 2;\n      }\n      let index1: number;\n      if (slashIndex + 1 < list.length) {\n        index1 = slashIndex + i + 1;\n        while (index1 >= list.length) {\n          index1 = index1 - (index1 == slashIndex + 2 ? 1 : 2);\n        }\n      } else {\n        index1 = index0;\n      }\n      const vals = [list[index0], list[index1]];\n      if (this.syntax[i].tryParse(vals, 0, this) != 2) {\n        this.error = true;\n        return 0;\n      }\n    }\n    return list.length;\n  }\n}\n\nexport class CommaShorthandValidator extends SimpleShorthandValidator {\n  constructor() {\n    super();\n  }\n\n  mergeIn(acc: { [key: string]: Css.Val[] }, values: ValueMap) {\n    for (const name of this.propList) {\n      const val = values[name] || this.validatorSet.defaultValues[name];\n      let arr = acc[name];\n      if (!arr) {\n        arr = [];\n        acc[name] = arr;\n      }\n      arr.push(val);\n    }\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    const acc: { [key: string]: Css.Val[] } = {};\n    for (let i = 0; i < list.values.length; i++) {\n      this.values = {};\n      if (list.values[i] instanceof Css.CommaList) {\n        this.error = true;\n      } else {\n        list.values[i].visit(this);\n        this.mergeIn(acc, this.values);\n        if (this.values[\"background-color\"] && i != list.values.length - 1) {\n          this.error = true;\n        }\n      }\n      if (this.error) {\n        return null;\n      }\n    }\n    this.values = {};\n    for (const name in acc) {\n      if (name == \"background-color\") {\n        this.values[name] = acc[name].pop();\n      } else {\n        this.values[name] = new Css.CommaList(acc[name]);\n      }\n    }\n    return null;\n  }\n}\n\nexport class FontShorthandValidator extends SimpleShorthandValidator {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  init(syntax: ShorthandSyntaxNode[], propList: string[]): void {\n    super.init(syntax, propList);\n    this.propList.push(\"font-family\", \"line-height\", \"font-size\");\n  }\n\n  /**\n   * @override\n   */\n  validateList(list: Css.Val[]): number {\n    let index = super.validateList(list);\n\n    // must at least have font-size and font-family at the end\n    if (index + 2 > list.length) {\n      this.error = true;\n      return index;\n    }\n    this.error = false;\n    const validators = this.validatorSet.validators;\n    if (!list[index].visit(validators[\"font-size\"])) {\n      this.error = true;\n      return index;\n    }\n    this.values[\"font-size\"] = list[index++];\n    if (list[index] === Css.slash) {\n      index++;\n\n      // must at least have line-height and font-family at the end\n      if (index + 2 > list.length) {\n        this.error = true;\n        return index;\n      }\n      if (!list[index].visit(validators[\"line-height\"])) {\n        this.error = true;\n        return index;\n      }\n      this.values[\"line-height\"] = list[index++];\n    }\n    const fontFamily =\n      index == list.length - 1\n        ? list[index]\n        : new Css.SpaceList(list.slice(index, list.length));\n    if (!fontFamily.visit(validators[\"font-family\"])) {\n      this.error = true;\n      return index;\n    }\n    this.values[\"font-family\"] = fontFamily;\n    return list.length;\n  }\n\n  /**\n   * @override\n   */\n  visitCommaList(list: Css.CommaList): Css.Val {\n    list.values[0].visit(this);\n    if (this.error) {\n      return null;\n    }\n    const familyList = [this.values[\"font-family\"]];\n    for (let i = 1; i < list.values.length; i++) {\n      familyList.push(list.values[i]);\n    }\n    const family = new Css.CommaList(familyList);\n    if (!family.visit(this.validatorSet.validators[\"font-family\"])) {\n      this.error = true;\n    } else {\n      this.values[\"font-family\"] = family;\n    }\n    return null;\n  }\n\n  /**\n   * @override\n   */\n  visitIdent(ident: Css.Ident): Css.Val {\n    const props = this.validatorSet.systemFonts[ident.name];\n    if (props) {\n      for (const name in props) {\n        this.values[name] = props[name];\n      }\n    } else {\n      this.error = true;\n    }\n    return null;\n  }\n}\n\nexport const shorthandValidators: {\n  [key: string]: typeof ShorthandValidator;\n} = {\n  SIMPLE: SimpleShorthandValidator,\n  INSETS: InsetsShorthandValidator,\n  INSETS_SLASH: InsetsSlashShorthandValidator,\n  COMMA: CommaShorthandValidator,\n  FONT: FontShorthandValidator,\n};\n\n//---- validation grammar parser and public property validator\n//------------------------\n\n/**\n * Object that validates simple and shorthand properties, breaking up shorthand\n * properties into corresponding simple ones, also stripping property prefixes.\n */\nexport class ValidatorSet {\n  validators: { [key: string]: PropertyValidator } = {};\n  prefixes: { [key: string]: { [key: string]: boolean } } = {};\n  defaultValues: ValueMap = {};\n  namedValidators: { [key: string]: ValidatingGroup } = {};\n  systemFonts: { [key: string]: ValueMap } = {};\n  shorthands: { [key: string]: ShorthandValidator } = {};\n  layoutProps: ValueMap = {};\n  backgroundProps: ValueMap = {};\n\n  private addReplacement(\n    val: ValidatingGroup,\n    token: CssTokenizer.Token,\n  ): ValidatingGroup {\n    let cssval: Css.Val;\n    if (token.type == CssTokenizer.TokenType.NUMERIC) {\n      cssval = new Css.Numeric(token.num, token.text);\n    } else if (token.type == CssTokenizer.TokenType.HASH) {\n      cssval = CssParser.colorFromHash(token.text);\n    } else if (token.type == CssTokenizer.TokenType.IDENT) {\n      cssval = Css.getName(token.text);\n    } else {\n      throw new Error(\"unexpected replacement\");\n    }\n    if (val.isPrimitive()) {\n      const validator = val.nodes[0].validator as PrimitiveValidator;\n      const idents = validator.idents;\n      for (const ident in idents) {\n        idents[ident] = cssval;\n      }\n      return val;\n    }\n    throw new Error(\"unexpected replacement\");\n  }\n\n  private newGroup(op: string, vals: ValidatingGroup[]): ValidatingGroup {\n    const group = new ValidatingGroup();\n    if (op == \"||\") {\n      for (let i = 0; i < vals.length; i++) {\n        const subgroup = new ValidatingGroup();\n        subgroup.startClause(i);\n        subgroup.addGroup(vals[i], Add.FOLLOW);\n        subgroup.endClause(i);\n        group.addGroup(subgroup, i == 0 ? Add.FOLLOW : Add.ALTERNATE);\n      }\n      const outer = new ValidatingGroup();\n      outer.startSpecialGroup();\n      outer.addGroup(group, Add.REPEATED);\n      outer.endSpecialGroup();\n      return outer;\n    } else {\n      let how: Add;\n      switch (op) {\n        case \" \":\n          how = Add.FOLLOW;\n          break;\n        case \"|\":\n        case \"||\":\n          how = Add.ALTERNATE;\n          break;\n        default:\n          throw new Error(\"unexpected op\");\n      }\n      for (let i = 0; i < vals.length; i++) {\n        group.addGroup(vals[i], i == 0 ? Add.FOLLOW : how);\n      }\n      return group;\n    }\n  }\n\n  private addCounts(\n    val: ValidatingGroup,\n    min: number,\n    max: number,\n  ): ValidatingGroup {\n    const group = new ValidatingGroup();\n    for (let i = 0; i < min; i++) {\n      group.addGroup(val.clone(), Add.FOLLOW);\n    }\n    if (max == Number.POSITIVE_INFINITY) {\n      group.addGroup(val, Add.REPEATED);\n    } else {\n      for (let i = min; i < max; i++) {\n        group.addGroup(val.clone(), Add.OPTIONAL);\n      }\n    }\n    return group;\n  }\n\n  private primitive(validator: PropertyValidator): ValidatingGroup {\n    const group = new ValidatingGroup();\n    group.addPrimitive(validator);\n    return group;\n  }\n\n  private newFunc(fn: string, val: ValidatingGroup): ValidatingGroup {\n    let validator: PropertyValidator;\n    switch (fn) {\n      case \"COMMA\":\n        validator = new CommaListValidator(val);\n        break;\n      case \"SPACE\":\n        validator = new SpaceListValidator(val);\n        break;\n      default:\n        validator = new FuncValidator(fn.toLowerCase(), val);\n        break;\n    }\n    return this.primitive(validator);\n  }\n\n  initBuiltInValidators(): void {\n    this.namedValidators[\"HASHCOLOR\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_COLOR, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"POS_INT\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_INT, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"POS_NUM\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUM, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"POS_PERCENTAGE\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, { \"%\": Css.empty }),\n    );\n    this.namedValidators[\"NEGATIVE\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_NEGATIVE, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"ZERO\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_ZERO, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"ZERO_PERCENTAGE\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_ZERO_PERCENT, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"POS_LENGTH\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, {\n        em: Css.empty,\n        ex: Css.empty,\n        ch: Css.empty,\n        rem: Css.empty,\n        vw: Css.empty,\n        vh: Css.empty,\n        vi: Css.empty,\n        vb: Css.empty,\n        vmin: Css.empty,\n        vmax: Css.empty,\n        pvw: Css.empty,\n        pvh: Css.empty,\n        pvi: Css.empty,\n        pvb: Css.empty,\n        pvmin: Css.empty,\n        pvmax: Css.empty,\n        cm: Css.empty,\n        mm: Css.empty,\n        in: Css.empty,\n        px: Css.empty,\n        pt: Css.empty,\n        pc: Css.empty,\n        q: Css.empty,\n      }),\n    );\n    this.namedValidators[\"POS_ANGLE\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, {\n        deg: Css.empty,\n        grad: Css.empty,\n        rad: Css.empty,\n        turn: Css.empty,\n      }),\n    );\n    this.namedValidators[\"POS_TIME\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, {\n        s: Css.empty,\n        ms: Css.empty,\n      }),\n    );\n    this.namedValidators[\"FREQUENCY\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, {\n        Hz: Css.empty,\n        kHz: Css.empty,\n      }),\n    );\n    this.namedValidators[\"RESOLUTION\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_POS_NUMERIC, NO_IDENTS, {\n        dpi: Css.empty,\n        dpcm: Css.empty,\n        dppx: Css.empty,\n      }),\n    );\n    this.namedValidators[\"URI\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_URL, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"IDENT\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_IDENT, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"STRING\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_STR, NO_IDENTS, NO_IDENTS),\n    );\n    this.namedValidators[\"SLASH\"] = this.primitive(\n      new PrimitiveValidator(ALLOW_SLASH, NO_IDENTS, NO_IDENTS),\n    );\n    const stdfont = { \"font-family\": Css.getName(\"sans-serif\") };\n    this.systemFonts[\"caption\"] = stdfont;\n    this.systemFonts[\"icon\"] = stdfont;\n    this.systemFonts[\"menu\"] = stdfont;\n    this.systemFonts[\"message-box\"] = stdfont;\n    this.systemFonts[\"small-caption\"] = stdfont;\n    this.systemFonts[\"status-bar\"] = stdfont;\n  }\n\n  private isBuiltIn(name: string): boolean {\n    return !!name.match(/^[A-Z_0-9]+$/);\n  }\n\n  private readNameAndPrefixes(\n    tok: CssTokenizer.Tokenizer,\n    section: number,\n  ): string | null {\n    let token = tok.token();\n    if (token.type == CssTokenizer.TokenType.EOF) {\n      // Finished normally\n      return null;\n    }\n    const rulePrefixes: { [key: string]: boolean } = { \"\": true };\n    if (token.type == CssTokenizer.TokenType.O_BRK) {\n      do {\n        tok.consume();\n        token = tok.token();\n        if (token.type != CssTokenizer.TokenType.IDENT) {\n          throw new Error(\"Prefix name expected\");\n        }\n        rulePrefixes[token.text] = true;\n        tok.consume();\n        token = tok.token();\n      } while (token.type == CssTokenizer.TokenType.COMMA);\n      if (token.type != CssTokenizer.TokenType.C_BRK) {\n        throw new Error(\"']' expected\");\n      }\n      tok.consume();\n      token = tok.token();\n    }\n    if (token.type != CssTokenizer.TokenType.IDENT) {\n      throw new Error(\"Property name expected\");\n    }\n    if (section == 2 ? token.text == \"SHORTHANDS\" : token.text == \"DEFAULTS\") {\n      tok.consume();\n      return null;\n    }\n    const name = token.text;\n    tok.consume();\n    if (section != 2) {\n      if (tok.token().type != CssTokenizer.TokenType.EQ) {\n        throw new Error(\"'=' expected\");\n      }\n      if (!this.isBuiltIn(name)) {\n        this.prefixes[name] = rulePrefixes;\n      }\n    } else {\n      if (tok.token().type != CssTokenizer.TokenType.COLON) {\n        throw new Error(\"':' expected\");\n      }\n    }\n    return name;\n  }\n\n  private parseValidators(tok: CssTokenizer.Tokenizer): void {\n    while (true) {\n      const ruleName = this.readNameAndPrefixes(tok, 1);\n      if (!ruleName) {\n        return;\n      }\n      let vals: ValidatingGroup[] = [];\n      const stack = [];\n      let op = \"\";\n      let val: ValidatingGroup;\n      let expectval = true;\n      const self = this;\n      const reduce = (): ValidatingGroup => {\n        if (vals.length == 0) {\n          throw new Error(\"No values\");\n        }\n        if (vals.length == 1) {\n          return vals[0];\n        }\n        return self.newGroup(op, vals);\n      };\n      const setop = (currop: string): void => {\n        if (expectval) {\n          throw new Error(`'${currop}': unexpected`);\n        }\n        if (op && op != currop) {\n          throw new Error(`mixed operators: '${currop}' and '${op}'`);\n        }\n        op = currop;\n        expectval = true;\n      };\n      let result: ValidatingGroup = null;\n      while (!result) {\n        tok.consume();\n        let token = tok.token();\n        switch (token.type) {\n          case CssTokenizer.TokenType.IDENT:\n            if (!expectval) {\n              setop(\" \");\n            }\n            if (this.isBuiltIn(token.text)) {\n              const builtIn = this.namedValidators[token.text];\n              if (!builtIn) {\n                throw new Error(`'${token.text}' unexpected`);\n              }\n              vals.push(builtIn.clone());\n            } else {\n              const idents = {};\n              idents[token.text.toLowerCase()] = Css.getName(token.text);\n              vals.push(\n                this.primitive(new PrimitiveValidator(0, idents, NO_IDENTS)),\n              );\n            }\n            expectval = false;\n            break;\n          case CssTokenizer.TokenType.INT: {\n            const idents = {};\n            idents[`${token.num}`] = new Css.Int(token.num);\n            vals.push(\n              this.primitive(new PrimitiveValidator(0, idents, NO_IDENTS)),\n            );\n            expectval = false;\n            break;\n          }\n          case CssTokenizer.TokenType.BAR:\n            setop(\"|\");\n            break;\n          case CssTokenizer.TokenType.BAR_BAR:\n            setop(\"||\");\n            break;\n          case CssTokenizer.TokenType.O_BRK:\n            if (!expectval) {\n              setop(\" \");\n            }\n            stack.push({ vals, op, b: \"[\" });\n            op = \"\";\n            vals = [];\n            expectval = true;\n            break;\n          case CssTokenizer.TokenType.FUNC:\n            if (!expectval) {\n              setop(\" \");\n            }\n            stack.push({ vals, op, b: \"(\", fn: token.text });\n            op = \"\";\n            vals = [];\n            expectval = true;\n            break;\n          case CssTokenizer.TokenType.C_BRK: {\n            val = reduce();\n            const open = stack.pop();\n            if (open.b != \"[\") {\n              throw new Error(\"']' unexpected\");\n            }\n            vals = open.vals;\n            vals.push(val);\n            op = open.op;\n            expectval = false;\n            break;\n          }\n          case CssTokenizer.TokenType.C_PAR: {\n            val = reduce();\n            const open = stack.pop();\n            if (open.b != \"(\") {\n              throw new Error(\"')' unexpected\");\n            }\n            vals = open.vals;\n            vals.push(this.newFunc(open.fn, val));\n            op = open.op;\n            expectval = false;\n            break;\n          }\n          case CssTokenizer.TokenType.COLON:\n            if (expectval) {\n              throw new Error(\"':' unexpected\");\n            }\n            tok.consume();\n            vals.push(this.addReplacement(vals.pop(), tok.token()));\n            break;\n          case CssTokenizer.TokenType.QMARK:\n            if (expectval) {\n              throw new Error(\"'?' unexpected\");\n            }\n            vals.push(this.addCounts(vals.pop(), 0, 1));\n            break;\n          case CssTokenizer.TokenType.STAR:\n            if (expectval) {\n              throw new Error(\"'*' unexpected\");\n            }\n            vals.push(this.addCounts(vals.pop(), 0, Number.POSITIVE_INFINITY));\n            break;\n          case CssTokenizer.TokenType.PLUS:\n            if (expectval) {\n              throw new Error(\"'+' unexpected\");\n            }\n            vals.push(this.addCounts(vals.pop(), 1, Number.POSITIVE_INFINITY));\n            break;\n          case CssTokenizer.TokenType.O_BRC: {\n            tok.consume();\n            token = tok.token();\n            if (token.type != CssTokenizer.TokenType.INT) {\n              throw new Error(\"<int> expected\");\n            }\n            const min = token.num;\n            let max = min;\n            tok.consume();\n            token = tok.token();\n            if (token.type == CssTokenizer.TokenType.COMMA) {\n              tok.consume();\n              token = tok.token();\n              if (token.type != CssTokenizer.TokenType.INT) {\n                throw new Error(\"<int> expected\");\n              }\n              max = token.num;\n              tok.consume();\n              token = tok.token();\n            }\n            if (token.type != CssTokenizer.TokenType.C_BRC) {\n              throw new Error(\"'}' expected\");\n            }\n            vals.push(this.addCounts(vals.pop(), min, max));\n            break;\n          }\n          case CssTokenizer.TokenType.SEMICOL:\n            result = reduce();\n            if (stack.length > 0) {\n              throw new Error(`unclosed '${stack.pop().b}'`);\n            }\n            break;\n          default:\n            throw new Error(\"unexpected token\");\n        }\n      }\n      tok.consume();\n      if (this.isBuiltIn(ruleName)) {\n        this.namedValidators[ruleName] = result;\n      } else {\n        if (result.isSimple()) {\n          this.validators[ruleName] = result.nodes[0].validator;\n        } else {\n          this.validators[ruleName] = new SpaceListValidator(result);\n        }\n      }\n    }\n  }\n\n  private parseDefaults(tok: CssTokenizer.Tokenizer): void {\n    while (true) {\n      const propName = this.readNameAndPrefixes(tok, 2);\n      if (!propName) {\n        return;\n      }\n      const vals: Css.Val[] = [];\n      while (true) {\n        tok.consume();\n        const token = tok.token();\n        if (token.type == CssTokenizer.TokenType.SEMICOL) {\n          tok.consume();\n          break;\n        }\n        switch (token.type) {\n          case CssTokenizer.TokenType.IDENT:\n            vals.push(Css.getName(token.text));\n            break;\n          case CssTokenizer.TokenType.NUM:\n            vals.push(new Css.Num(token.num));\n            break;\n          case CssTokenizer.TokenType.INT:\n            vals.push(new Css.Int(token.num));\n            break;\n          case CssTokenizer.TokenType.NUMERIC:\n            vals.push(new Css.Numeric(token.num, token.text));\n            break;\n          default:\n            throw new Error(\"unexpected token\");\n        }\n      }\n      this.defaultValues[propName] =\n        vals.length > 1 ? new Css.SpaceList(vals) : vals[0];\n    }\n  }\n\n  private parseShorthands(tok: CssTokenizer.Tokenizer): void {\n    while (true) {\n      const ruleName = this.readNameAndPrefixes(tok, 3);\n      if (!ruleName) {\n        return;\n      }\n      let token = tok.nthToken(1);\n      let shorthandValidator: ShorthandValidator;\n      if (\n        token.type == CssTokenizer.TokenType.IDENT &&\n        shorthandValidators[token.text]\n      ) {\n        shorthandValidator = new shorthandValidators[token.text]();\n        tok.consume();\n      } else {\n        shorthandValidator = new SimpleShorthandValidator();\n      }\n      shorthandValidator.setOwner(this);\n      let result = false;\n      let syntax: ShorthandSyntaxNode[] = [];\n      let slash = false;\n      const stack = [];\n      const propList = [];\n      while (!result) {\n        tok.consume();\n        token = tok.token();\n        switch (token.type) {\n          case CssTokenizer.TokenType.IDENT:\n            if (this.validators[token.text]) {\n              syntax.push(shorthandValidator.syntaxNodeForProperty(token.text));\n              propList.push(token.text);\n            } else if (\n              this.shorthands[token.text] instanceof InsetsShorthandValidator\n            ) {\n              const insetShorthand = this.shorthands[\n                token.text\n              ] as InsetsShorthandValidator;\n              syntax.push(insetShorthand.createSyntaxNode());\n              propList.push(...insetShorthand.propList);\n            } else {\n              throw new Error(\n                `'${token.text}' is neither a simple property nor an inset shorthand`,\n              );\n            }\n            break;\n          case CssTokenizer.TokenType.SLASH:\n            if (syntax.length > 0 || slash) {\n              throw new Error(\"unexpected slash\");\n            }\n            slash = true;\n            break;\n          case CssTokenizer.TokenType.O_BRK:\n            stack.push({ slash, syntax });\n            syntax = [];\n            slash = false;\n            break;\n          case CssTokenizer.TokenType.C_BRK: {\n            const compound = new ShorthandSyntaxCompound(syntax, slash);\n            const item = stack.pop();\n            syntax = item.syntax;\n            slash = item.slash;\n            syntax.push(compound);\n            break;\n          }\n          case CssTokenizer.TokenType.SEMICOL:\n            result = true;\n            tok.consume();\n            break;\n          default:\n            throw new Error(\"unexpected token\");\n        }\n      }\n      shorthandValidator.init(syntax, propList);\n      this.shorthands[ruleName] = shorthandValidator;\n    }\n  }\n\n  parse(text: string): void {\n    // Not as robust as CSS parser.\n    const tok = new CssTokenizer.Tokenizer(text, null);\n    this.parseValidators(tok);\n    this.parseDefaults(tok);\n    this.parseShorthands(tok);\n    this.backgroundProps = this.makePropSet([\"background\"]);\n    this.layoutProps = this.makePropSet([\n      \"margin\",\n      \"border\",\n      \"padding\",\n      \"columns\",\n      \"column-gap\",\n      \"column-rule\",\n      \"column-fill\",\n    ]);\n  }\n\n  makePropSet(propList: string[]): ValueMap {\n    const map: ValueMap = {};\n    for (const prop of propList) {\n      const shorthand = this.shorthands[prop];\n      const list = shorthand ? shorthand.propList : [prop];\n      for (const pname of list) {\n        const pval = this.defaultValues[pname];\n        if (!pval) {\n          Logging.logger.warn(\"Unknown property in makePropSet:\", pname);\n        } else {\n          map[pname] = pval;\n        }\n      }\n    }\n    return map;\n  }\n\n  validatePropertyAndHandleShorthand(\n    name: string,\n    value: Css.Val,\n    important: boolean,\n    receiver: PropertyReceiver,\n  ): void {\n    let prefix = \"\";\n    const origName = name;\n    name = name.toLowerCase();\n    const r = name.match(/^-([a-z]+)-([-a-z0-9]+)$/);\n    if (r) {\n      prefix = r[1];\n      name = r[2];\n    }\n    const px = this.prefixes[name];\n    if (!px || !px[prefix]) {\n      receiver.unknownProperty(origName, value);\n      return;\n    }\n    const validator = this.validators[name];\n    if (validator) {\n      const rvalue =\n        value === Css.ident.inherit || value.isExpr()\n          ? value\n          : value.visit(validator);\n      if (rvalue) {\n        receiver.simpleProperty(name, rvalue, important);\n      } else {\n        receiver.invalidPropertyValue(origName, value);\n      }\n    } else {\n      const shorthand = this.shorthands[name].clone();\n      if (value === Css.ident.inherit) {\n        shorthand.propagateInherit(important, receiver);\n      } else {\n        value.visit(shorthand);\n        if (!shorthand.finish(important, receiver)) {\n          receiver.invalidPropertyValue(origName, value);\n        }\n      }\n    }\n  }\n}\n\nexport function baseValidatorSet(): ValidatorSet {\n  const validatorSet = new ValidatorSet();\n  validatorSet.initBuiltInValidators();\n  validatorSet.parse(ValidationTxt);\n  return validatorSet;\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Font - Deal with embedded fonts.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as Exprs from \"./exprs\";\nimport * as Logging from \"./logging\";\nimport * as Net from \"./net\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\n\nexport const traitProps: { [key: string]: Css.Val } = {\n  \"font-style\": Css.ident.normal,\n  \"font-variant\": Css.ident.normal,\n  \"font-weight\": Css.ident.normal,\n};\n\nexport const bogusFontData = `OTTO${new Date().valueOf()}`;\n\nexport let bogusFontCounter: number = 1;\n\nexport function makeFontTraitKey(properties: {\n  [key: string]: Css.Val;\n}): string {\n  const sb = new Base.StringBuffer();\n  for (const prop in traitProps) {\n    sb.append(\" \");\n    sb.append(properties[prop].toString());\n  }\n  return sb.toString();\n}\n\nexport function fillDefaults(properties: { [key: string]: Css.Val }): void {\n  for (const prop in traitProps) {\n    if (!properties[prop]) {\n      properties[prop] = traitProps[prop];\n    }\n  }\n}\n\nexport function prepareProperties(\n  properties: CssCascade.ElementStyle,\n  context: Exprs.Context,\n): { [key: string]: Css.Val } {\n  const result = {} as { [key: string]: Css.Val };\n  for (const prop in properties) {\n    result[prop] = CssCascade.getProp(properties, prop).evaluate(context, prop);\n  }\n  fillDefaults(result);\n  return result;\n}\n\n/**\n * A font declared in a font-face rule.\n */\nexport class Face {\n  fontTraitKey: string;\n  src: string | null;\n  blobURLs: string[] = [];\n  blobs: Blob[] = [];\n  family: string | null;\n\n  constructor(public readonly properties: { [key: string]: Css.Val }) {\n    this.fontTraitKey = makeFontTraitKey(this.properties);\n    this.src = this.properties[\"src\"]\n      ? this.properties[\"src\"].toString()\n      : null;\n    const family = this.properties[\"font-family\"];\n    this.family = family ? family.stringValue() : null;\n  }\n\n  /**\n   * Check if font traits are the same for two font faces\n   */\n  traitsEqual(other: Face): boolean {\n    return this.fontTraitKey == other.fontTraitKey;\n  }\n\n  /**\n   * Create \"at\" font-face rule.\n   */\n  makeAtRule(src: string, fontBytes: Blob): string {\n    const sb = new Base.StringBuffer();\n    sb.append(\"@font-face {\\n  font-family: \");\n    sb.append(this.family as string);\n    sb.append(\";\\n  \");\n    for (const prop in traitProps) {\n      sb.append(prop);\n      sb.append(\": \");\n      this.properties[prop].appendTo(sb, true);\n      sb.append(\";\\n  \");\n    }\n    if (fontBytes) {\n      sb.append('src: url(\"');\n      const blobURL = Net.createObjectURL(fontBytes);\n      sb.append(blobURL);\n      this.blobURLs.push(blobURL);\n      this.blobs.push(fontBytes);\n      sb.append('\")');\n    } else {\n      sb.append(\"src: \");\n      sb.append(src);\n    }\n    sb.append(\";\\n}\\n\");\n    return sb.toString();\n  }\n}\n\n/**\n * Set of the fonts declared in all stylesheets of a document.\n * @param deobfuscator function\n *     that takes url and returns data deobfuscator\n */\nexport class DocumentFaces {\n  /**\n   * Maps source font family names to the family names used in the HTML view.\n   */\n  familyMap = {} as { [key: string]: string };\n\n  constructor(\n    public readonly deobfuscator:\n      | ((p1: string) => ((p1: Blob) => Task.Result<Blob>) | null)\n      | null,\n  ) {}\n\n  registerFamily(srcFace: Face, viewFace: Face): void {\n    const srcFamily = srcFace.family as string;\n    const viewFamilyFromSrc = this.familyMap[srcFamily];\n    const viewFamilyFromView = viewFace.family;\n    if (viewFamilyFromSrc) {\n      if (viewFamilyFromSrc != viewFamilyFromView) {\n        throw new Error(`E_FONT_FAMILY_INCONSISTENT ${srcFace.family}`);\n      }\n    } else {\n      this.familyMap[srcFamily] = viewFamilyFromView as string;\n    }\n  }\n\n  filterFontFamily(val: Css.Val): Css.Val {\n    if (val instanceof Css.CommaList) {\n      const list = (val as Css.CommaList).values;\n      const newValues = [] as Css.Val[];\n      for (const v of list) {\n        const r = this.familyMap[v.stringValue()];\n        if (r) {\n          newValues.push(Css.getName(r));\n        }\n        newValues.push(v);\n      }\n      return new Css.CommaList(newValues);\n    } else {\n      const rf = this.familyMap[val.stringValue()];\n      if (rf) {\n        return new Css.CommaList([Css.getName(rf), val]);\n      }\n      return val;\n    }\n  }\n}\n\n/**\n * Object that loads fonts in a document and allocates font families for them\n * in the view document\n * @param head where to add styles in the view document (normally head element)\n * @param body where to probe text in the view document (normally body element)\n */\nexport class Mapper {\n  /**\n   * Maps Face.src to an entry for an already-loaded font.\n   */\n  srcURLMap: { [key: string]: TaskUtil.Fetcher<Face> } = {};\n  familyPrefix: string;\n  familyCounter: number = 0;\n\n  constructor(\n    public readonly head: Element,\n    public readonly body: Element,\n    opt_familyPrefix?: string,\n  ) {\n    this.familyPrefix = opt_familyPrefix || \"Fnt_\";\n  }\n\n  getViewFontFamily(srcFace: Face, documentFaces: DocumentFaces): string {\n    const srcFamily = srcFace.family as string;\n    let viewFamily = documentFaces.familyMap[srcFamily];\n    if (viewFamily) {\n      return viewFamily;\n    }\n    viewFamily = this.familyPrefix + ++this.familyCounter;\n    documentFaces.familyMap[srcFamily] = viewFamily;\n    return viewFamily;\n  }\n\n  /**\n   * @param fontBytes deobfuscated font bytes (if deobfuscation is needed)\n   */\n  private initFont(\n    srcFace: Face,\n    fontBytes: Blob,\n    documentFaces: DocumentFaces,\n  ): Task.Result<Face> {\n    const frame: Task.Frame<Face> = Task.newFrame(\"initFont\");\n    const self = this;\n    const src = srcFace.src as string;\n    const props = {} as { [key: string]: Css.Val };\n    for (const prop in traitProps) {\n      props[prop] = srcFace.properties[prop];\n    }\n    const fontFamily = self.getViewFontFamily(srcFace, documentFaces);\n    props[\"font-family\"] = Css.getName(fontFamily);\n    const viewFontFace = new Face(props);\n    const probe = self.body.ownerDocument.createElement(\"span\") as HTMLElement;\n    probe.textContent = \"M\";\n    const killTime = new Date().valueOf() + 1000;\n    const style = self.head.ownerDocument.createElement(\"style\");\n    const bogusData = bogusFontData + bogusFontCounter++;\n    style.textContent = viewFontFace.makeAtRule(\"\", Net.makeBlob([bogusData]));\n    self.head.appendChild(style);\n    self.body.appendChild(probe);\n    probe.style.visibility = \"hidden\";\n    probe.style.fontFamily = fontFamily;\n    for (const pname in traitProps) {\n      Base.setCSSProperty(probe, pname, props[pname].toString());\n    }\n    const rect = probe.getBoundingClientRect();\n    const initWidth = rect.right - rect.left;\n    const initHeight = rect.bottom - rect.top;\n    style.textContent = viewFontFace.makeAtRule(src, fontBytes);\n    Logging.logger.info(\"Starting to load font:\", src);\n    let loaded = false;\n    frame\n      .loop(() => {\n        const rect = probe.getBoundingClientRect();\n        const currWidth = rect.right - rect.left;\n        const currHeight = rect.bottom - rect.top;\n        if (initWidth != currWidth || initHeight != currHeight) {\n          loaded = true;\n          return Task.newResult(false);\n        }\n        const currTime = new Date().valueOf();\n        if (currTime > killTime) {\n          return Task.newResult(false);\n        }\n        return frame.sleep(10);\n      })\n      .then(() => {\n        if (loaded) {\n          Logging.logger.info(\"Loaded font:\", src);\n        } else {\n          Logging.logger.warn(\"Failed to load font:\", src);\n        }\n        self.body.removeChild(probe);\n        frame.finish(viewFontFace);\n      });\n    return frame.result();\n  }\n\n  loadFont(\n    srcFace: Face,\n    documentFaces: DocumentFaces,\n  ): TaskUtil.Fetcher<Face> {\n    const src = srcFace.src as string;\n    let fetcher = this.srcURLMap[src];\n    const self = this;\n    if (fetcher) {\n      fetcher.piggyback((viewFaceParam) => {\n        const viewFace = viewFaceParam as Face;\n        if (!viewFace.traitsEqual(srcFace)) {\n          Logging.logger.warn(\"E_FONT_FACE_INCOMPATIBLE\", srcFace.src);\n        } else {\n          documentFaces.registerFamily(srcFace, viewFace);\n          Logging.logger.warn(\"Found already-loaded font:\", src);\n        }\n      });\n    } else {\n      fetcher = new TaskUtil.Fetcher(() => {\n        const frame: Task.Frame<Face> = Task.newFrame(\"loadFont\");\n        const deobfuscator = documentFaces.deobfuscator\n          ? documentFaces.deobfuscator(src)\n          : null;\n        if (deobfuscator) {\n          Net.ajax(src, Net.XMLHttpRequestResponseType.BLOB).then((xhr) => {\n            if (!xhr.responseBlob) {\n              frame.finish(null);\n              return;\n            }\n            deobfuscator(xhr.responseBlob).then((fontBytes) => {\n              self\n                .initFont(srcFace, fontBytes, documentFaces)\n                .thenFinish(frame);\n            });\n          });\n        } else {\n          self.initFont(srcFace, null, documentFaces).thenFinish(frame);\n        }\n        return frame.result();\n      }, `loadFont ${src}`);\n      this.srcURLMap[src] = fetcher;\n      fetcher.start();\n    }\n    return fetcher;\n  }\n\n  findOrLoadFonts(\n    srcFaces: Face[],\n    documentFaces: DocumentFaces,\n  ): Task.Result<boolean> {\n    const fetchers = [] as TaskUtil.Fetcher<Face>[];\n    for (const srcFace of srcFaces) {\n      if (!srcFace.src || !srcFace.family) {\n        Logging.logger.warn(\"E_FONT_FACE_INVALID\");\n        continue;\n      }\n      fetchers.push(this.loadFont(srcFace, documentFaces));\n    }\n    return TaskUtil.waitForFetchers(fetchers);\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview PageMaster - Deal with page masters, partition groups, and partitions.\n */\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssValidator from \"./css-validator\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as Vtree from \"./vtree\";\n\nexport let keyCount: number = 1;\n\n/**\n * Represent an at-rule which creates a page-level CSS box (page-master,\n * partition, and partition-group).\n */\nexport abstract class PageBox<\n  I extends PageBoxInstance = PageBoxInstance<any>\n> {\n  // styles specified in the at-rule\n  specified: CssCascade.ElementStyle = {};\n  children: PageBox[] = [];\n  pageMaster: PageMaster = null;\n  index: number = 0;\n  key: string;\n\n  protected _scope: Exprs.LexicalScope;\n\n  get scope(): Exprs.LexicalScope {\n    return this._scope;\n  }\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    public readonly name: string | null,\n    public readonly pseudoName: string | null,\n    public readonly classes: string[],\n    public readonly parent: PageBox,\n  ) {\n    this._scope = scope;\n    this.key = `p${keyCount++}`;\n    if (parent) {\n      this.index = parent.children.length;\n      parent.children.push(this);\n    }\n  }\n\n  createInstance(parentInstance: PageBoxInstance): PageBoxInstance {\n    throw new Error(\"E_UNEXPECTED_CALL\");\n  }\n\n  /**\n   * Clone the PageBox.\n   * @param param parent: The parent of the cloned PageBox.\n   *     pseudoName: Assign this value as the pseudoName of the cloned PageBox.\n   */\n  clone(param: { parent?: PageBox; pseudoName?: string }): PageBox<I> {\n    throw new Error(\"E_UNEXPECTED_CALL\");\n  }\n\n  /**\n   * Copy 'specified' properties to another instance.\n   * @param dest The PageBox into which 'specified' properties are copied\n   */\n  protected copySpecified(dest: PageBox) {\n    const specified = this.specified;\n    const destSpecified = dest.specified;\n    for (const prop in specified) {\n      if (Object.prototype.hasOwnProperty.call(specified, prop)) {\n        destSpecified[prop] = specified[prop];\n      }\n    }\n  }\n\n  /**\n   * Clone children with the specified PageBox as their parent.\n   */\n  protected cloneChildren(parent: PageBox) {\n    for (let i = 0; i < this.children.length; i++) {\n      // the cloned child is added to parent.children in the child constructor.\n      this.children[i].clone({ parent });\n    }\n  }\n}\n\n/**\n * Parent of all page masters\n */\nexport class RootPageBox extends PageBox<RootPageBoxInstance> {\n  constructor(scope: Exprs.LexicalScope) {\n    super(scope, null, null, [], null);\n    this.specified[\"width\"] = new CssCascade.CascadeValue(Css.fullWidth, 0);\n    this.specified[\"height\"] = new CssCascade.CascadeValue(Css.fullHeight, 0);\n  }\n}\n\nexport class PageMasterScope extends Exprs.LexicalScope {\n  constructor(scope: Exprs.LexicalScope, public pageMaster: PageMaster) {\n    super(scope, resolver);\n    const self = this;\n    function resolver(qualifiedName, isFunc) {\n      const r = qualifiedName.match(/^([^.]+)\\.([^.]+)$/);\n      if (r) {\n        const key = self.pageMaster.keyMap[r[1]];\n        if (key) {\n          const holder = this as InstanceHolder;\n          const boxInstance = holder.lookupInstance(key);\n          if (boxInstance) {\n            if (isFunc) {\n              return boxInstance.resolveFunc(r[2]);\n            } else {\n              return boxInstance.resolveName(r[2]);\n            }\n          }\n        }\n      }\n      return null;\n    }\n  }\n}\n\n/**\n * Represent a page-master rule\n */\nexport class PageMaster<\n  I extends PageMasterInstance = PageMasterInstance<any>\n> extends PageBox<I> {\n  pageMaster: PageMaster;\n  keyMap: { [key: string]: string } = {};\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n    parent: RootPageBox,\n    public readonly condition: Exprs.Val,\n    public readonly specificity: number,\n  ) {\n    super(scope, name, pseudoName, classes, parent);\n    // if PageMasterScope object is passed, use (share) it.\n    if (!(scope instanceof PageMasterScope)) {\n      this._scope = new PageMasterScope(scope, this);\n    }\n    this.pageMaster = this;\n    this.specified[\"width\"] = new CssCascade.CascadeValue(Css.fullWidth, 0);\n    this.specified[\"height\"] = new CssCascade.CascadeValue(Css.fullHeight, 0);\n    this.specified[\"wrap-flow\"] = new CssCascade.CascadeValue(\n      Css.ident.auto,\n      0,\n    );\n    this.specified[\"position\"] = new CssCascade.CascadeValue(\n      Css.ident.relative,\n      0,\n    );\n    this.specified[\"overflow\"] = new CssCascade.CascadeValue(\n      Css.ident.visible,\n      0,\n    );\n\n    // Shift 1px to workaround Chrome printing bug\n    // this.specified[\"top\"] = new CssCascade.CascadeValue(new Css.Numeric(-1, \"px\"), 0);\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance): PageBoxInstance {\n    return new PageMasterInstance(parentInstance, this);\n  }\n\n  /**\n   * @override\n   */\n  clone(param): PageMaster {\n    // The cloned page master shares the same scope object with the original\n    // one.\n    const cloned = new PageMaster(\n      this.scope,\n      this.name,\n      param.pseudoName || this.pseudoName,\n      this.classes,\n      this.parent as RootPageBox,\n      this.condition,\n      this.specificity,\n    );\n    this.copySpecified(cloned);\n    this.cloneChildren(cloned);\n    return cloned;\n  }\n\n  /**\n   * Point the pageMaster reference in the PageMasterScope to the current page\n   * master. This is needed when a page master is cloned and shares a common\n   * scope with the original page master. Since every Exprs.Val which the\n   * page master holds has a reference to the scope and uses it for variable\n   * resolution, this reference must be updated properly before the page master\n   * instance is used.\n   */\n  resetScope() {\n    (this.scope as any).pageMaster = this;\n  }\n}\n\n/**\n * Represent a partition-group rule\n */\nexport class PartitionGroup extends PageBox<PartitionGroupInstance> {\n  pageMaster: PageMaster;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n    parent: PageBox,\n  ) {\n    super(scope, name, pseudoName, classes, parent);\n    this.pageMaster = parent.pageMaster;\n    if (name) {\n      this.pageMaster.keyMap[name] = this.key;\n    }\n    this.specified[\"wrap-flow\"] = new CssCascade.CascadeValue(\n      Css.ident.auto,\n      0,\n    );\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance: PageBoxInstance): PageBoxInstance {\n    return new PartitionGroupInstance(parentInstance, this);\n  }\n\n  /**\n   * @override\n   */\n  clone(param): PartitionGroup {\n    const cloned = new PartitionGroup(\n      param.parent.scope,\n      this.name,\n      this.pseudoName,\n      this.classes,\n      param.parent,\n    );\n    this.copySpecified(cloned);\n    this.cloneChildren(cloned);\n    return cloned;\n  }\n}\n\n/**\n * Represent a partition rule\n */\nexport class Partition<\n  I extends PartitionInstance = PartitionInstance\n> extends PageBox<I> {\n  pageMaster: PageMaster;\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n    parent: PageBox,\n  ) {\n    super(scope, name, pseudoName, classes, parent);\n    this.pageMaster = parent.pageMaster;\n    if (name) {\n      this.pageMaster.keyMap[name] = this.key;\n    }\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance): PageBoxInstance {\n    return new PartitionInstance(parentInstance, this);\n  }\n\n  /**\n   * @override\n   */\n  clone(param): Partition {\n    const cloned = new Partition(\n      param.parent.scope,\n      this.name,\n      this.pseudoName,\n      this.classes,\n      param.parent,\n    );\n    this.copySpecified(cloned);\n    this.cloneChildren(cloned);\n    return cloned;\n  }\n}\n\n//---------------------------- Instance --------------------------------\n\n/**\n * @param def default value\n */\nexport function toExprIdent(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  def: string,\n): Exprs.Val {\n  if (!val) {\n    return new Exprs.Const(scope, def);\n  }\n  return val.toExpr(scope, scope.zero);\n}\n\nexport function toExprAuto(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  ref: Exprs.Val,\n): Exprs.Val {\n  if (!val || val === Css.ident.auto) {\n    return null;\n  }\n  return val.toExpr(scope, ref);\n}\n\nexport function toExprNormal(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  ref: Exprs.Val,\n): Exprs.Val {\n  if (!val || val === Css.ident.normal) {\n    return null;\n  }\n  return val.toExpr(scope, ref);\n}\n\nexport function toExprZero(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  ref: Exprs.Val,\n): Exprs.Val {\n  if (!val || val === Css.ident.auto) {\n    return scope.zero;\n  }\n  return val.toExpr(scope, ref);\n}\n\n/**\n * If the value is not specified (null), returns zero.\n * If the value is 'auto', returns null.\n * Otherwise, return the value itself.\n */\nexport function toExprZeroAuto(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  ref: Exprs.Val,\n): Exprs.Val {\n  if (!val) {\n    return scope.zero;\n  } else if (val === Css.ident.auto) {\n    return null;\n  } else {\n    return val.toExpr(scope, ref);\n  }\n}\n\nexport function toExprZeroBorder(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  styleVal: Css.Val,\n  ref: Exprs.Val,\n): Exprs.Val {\n  if (!val || styleVal === Css.ident.none) {\n    return scope.zero;\n  }\n  return val.toExpr(scope, ref);\n}\n\nexport function toExprBool(\n  scope: Exprs.LexicalScope,\n  val: Css.Val,\n  def: Exprs.Val,\n): Exprs.Val {\n  if (!val) {\n    return def;\n  }\n  if (val === Css.ident._true) {\n    return scope._true;\n  }\n  if (val === Css.ident._false) {\n    return scope._false;\n  }\n  return val.toExpr(scope, scope.zero);\n}\n\nexport interface InstanceHolder extends Exprs.Context {\n  registerInstance(key: string, instance: PageBoxInstance): void;\n\n  /**\n   * @return instance\n   */\n  lookupInstance(key: string): PageBoxInstance;\n}\n\nexport class PageBoxInstance<P extends PageBox = PageBox<any>> {\n  /**\n   * cascaded styles, geometric ones converted to Css.Expr\n   */\n  protected cascaded: CssCascade.ElementStyle = {};\n  style: { [key: string]: Css.Val } = {};\n  private autoWidth: Exprs.Native = null;\n  private autoHeight: Exprs.Native = null;\n  children: PageBoxInstance[] = [];\n  isAutoWidth: boolean = false;\n  isAutoHeight: boolean = false;\n  isTopDependentOnAutoHeight: boolean = false;\n  isRightDependentOnAutoWidth: boolean = false;\n  private calculatedWidth: number = 0;\n  private calculatedHeight: number = 0;\n  pageMasterInstance: PageMasterInstance = null;\n  namedValues: { [key: string]: Exprs.Val } = {};\n  namedFuncs: { [key: string]: Exprs.Val } = {};\n  vertical: boolean = false;\n  rtl: boolean = false;\n  suppressEmptyBoxGeneration: boolean = false;\n\n  constructor(\n    public readonly parentInstance: PageBoxInstance,\n    public readonly pageBox: P,\n  ) {\n    if (parentInstance) {\n      parentInstance.children.push(this);\n    }\n  }\n\n  /**\n   * Reset information related to layout.\n   */\n  reset() {\n    this.calculatedWidth = 0;\n    this.calculatedHeight = 0;\n  }\n\n  private addNamedValues(name1: string, name2: string): Exprs.Val {\n    const v1 = this.resolveName(name1);\n    const v2 = this.resolveName(name2);\n    if (!v1 || !v2) {\n      throw new Error(\"E_INTERNAL\");\n    }\n    return Exprs.add(this.pageBox.scope, v1, v2);\n  }\n\n  resolveName(name: string): Exprs.Val {\n    let expr = this.namedValues[name];\n    if (expr) {\n      return expr;\n    }\n    const val = this.style[name];\n    if (val) {\n      expr = val.toExpr(this.pageBox.scope, this.pageBox.scope.zero);\n    }\n    switch (name) {\n      case \"margin-left-edge\":\n        expr = this.resolveName(\"left\");\n        break;\n      case \"margin-top-edge\":\n        expr = this.resolveName(\"top\");\n        break;\n      case \"margin-right-edge\":\n        expr = this.addNamedValues(\"border-right-edge\", \"margin-right\");\n        break;\n      case \"margin-bottom-edge\":\n        expr = this.addNamedValues(\"border-bottom-edge\", \"margin-bottom\");\n        break;\n      case \"border-left-edge\":\n        expr = this.addNamedValues(\"margin-left-edge\", \"margin-left\");\n        break;\n      case \"border-top-edge\":\n        expr = this.addNamedValues(\"margin-top-edge\", \"margin-top\");\n        break;\n      case \"border-right-edge\":\n        expr = this.addNamedValues(\"padding-right-edge\", \"border-right-width\");\n        break;\n      case \"border-bottom-edge\":\n        expr = this.addNamedValues(\n          \"padding-bottom-edge\",\n          \"border-bottom-width\",\n        );\n        break;\n      case \"padding-left-edge\":\n        expr = this.addNamedValues(\"border-left-edge\", \"border-left-width\");\n        break;\n      case \"padding-top-edge\":\n        expr = this.addNamedValues(\"border-top-edge\", \"border-top-width\");\n        break;\n      case \"padding-right-edge\":\n        expr = this.addNamedValues(\"right-edge\", \"padding-right\");\n        break;\n      case \"padding-bottom-edge\":\n        expr = this.addNamedValues(\"bottom-edge\", \"padding-bottom\");\n        break;\n      case \"left-edge\":\n        expr = this.addNamedValues(\"padding-left-edge\", \"padding-left\");\n        break;\n      case \"top-edge\":\n        expr = this.addNamedValues(\"padding-top-edge\", \"padding-top\");\n        break;\n      case \"right-edge\":\n        expr = this.addNamedValues(\"left-edge\", \"width\");\n        break;\n      case \"bottom-edge\":\n        expr = this.addNamedValues(\"top-edge\", \"height\");\n        break;\n    }\n    if (!expr) {\n      let altName: string;\n      if (name == \"extent\") {\n        altName = this.vertical ? \"width\" : \"height\";\n      } else if (name == \"measure\") {\n        altName = this.vertical ? \"height\" : \"width\";\n      } else {\n        const map = this.vertical\n          ? CssCascade.couplingMapVert\n          : CssCascade.couplingMapHor;\n        altName = name;\n        for (const key in map) {\n          altName = altName.replace(key, map[key]);\n        }\n      }\n      if (altName != name) {\n        expr = this.resolveName(altName);\n      }\n    }\n    if (expr) {\n      this.namedValues[name] = expr;\n    }\n    return expr;\n  }\n\n  resolveFunc(name) {\n    let expr = this.namedFuncs[name];\n    if (expr) {\n      return expr;\n    }\n    switch (name) {\n      case \"columns\": {\n        // min(count,column-count) * (column-width + column-gap) - column-gap\n        const scope = this.pageBox.scope;\n        const count = new Exprs.Param(scope, 0);\n        const columnCount = this.resolveName(\"column-count\");\n        const columnWidth = this.resolveName(\"column-width\");\n        const columnGap = this.resolveName(\"column-gap\");\n        expr = Exprs.sub(\n          scope,\n          Exprs.mul(\n            scope,\n            new Exprs.Call(scope, \"min\", [count, columnCount]),\n            Exprs.add(scope, columnWidth, columnGap),\n          ),\n          columnGap,\n        );\n        break;\n      }\n    }\n    if (expr) {\n      this.namedFuncs[name] = expr;\n    }\n    return expr;\n  }\n\n  private initEnabled(): void {\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    let enabled = toExprBool(scope, style[\"enabled\"], scope._true);\n    const page = toExprAuto(scope, style[\"page\"], scope.zero);\n    if (page) {\n      const currentPage = new Exprs.Named(scope, \"page-number\");\n      enabled = Exprs.and(\n        scope,\n        enabled,\n        new Exprs.Eq(scope, page, currentPage),\n      );\n    }\n    const minPageWidth = toExprAuto(scope, style[\"min-page-width\"], scope.zero);\n    if (minPageWidth) {\n      enabled = Exprs.and(\n        scope,\n        enabled,\n        new Exprs.Ge(scope, new Exprs.Named(scope, \"page-width\"), minPageWidth),\n      );\n    }\n    const minPageHeight = toExprAuto(\n      scope,\n      style[\"min-page-height\"],\n      scope.zero,\n    );\n    if (minPageHeight) {\n      enabled = Exprs.and(\n        scope,\n        enabled,\n        new Exprs.Ge(\n          scope,\n          new Exprs.Named(scope, \"page-height\"),\n          minPageHeight,\n        ),\n      );\n    }\n    enabled = this.boxSpecificEnabled(enabled);\n    style[\"enabled\"] = new Css.Expr(enabled);\n  }\n\n  protected boxSpecificEnabled(enabled: Exprs.Val): Exprs.Val {\n    return enabled;\n  }\n\n  protected initHorizontal(): void {\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    const parentWidth = this.parentInstance\n      ? this.parentInstance.style[\"width\"].toExpr(scope, null)\n      : null;\n    let left = toExprAuto(scope, style[\"left\"], parentWidth);\n    let marginLeft = toExprAuto(scope, style[\"margin-left\"], parentWidth);\n    const borderLeftWidth = toExprZeroBorder(\n      scope,\n      style[\"border-left-width\"],\n      style[\"border-left-style\"],\n      parentWidth,\n    );\n    const paddingLeft = toExprZero(scope, style[\"padding-left\"], parentWidth);\n    let width = toExprAuto(scope, style[\"width\"], parentWidth);\n    let maxWidth = toExprAuto(scope, style[\"max-width\"], parentWidth);\n    const paddingRight = toExprZero(scope, style[\"padding-right\"], parentWidth);\n    const borderRightWidth = toExprZeroBorder(\n      scope,\n      style[\"border-right-width\"],\n      style[\"border-right-style\"],\n      parentWidth,\n    );\n    let marginRight = toExprAuto(scope, style[\"margin-right\"], parentWidth);\n    let right = toExprAuto(scope, style[\"right\"], parentWidth);\n    const leftBP = Exprs.add(scope, borderLeftWidth, paddingLeft);\n    const rightBP = Exprs.add(scope, borderLeftWidth, paddingRight);\n    if (left && right && width) {\n      let extra = Exprs.sub(\n        scope,\n        parentWidth,\n        Exprs.add(\n          scope,\n          width,\n          Exprs.add(scope, Exprs.add(scope, left, leftBP), rightBP),\n        ),\n      );\n      if (!marginLeft) {\n        extra = Exprs.sub(scope, extra, right);\n        if (!marginRight) {\n          marginLeft = Exprs.mul(scope, extra, new Exprs.Const(scope, 0.5));\n          marginRight = marginLeft;\n        } else {\n          marginLeft = Exprs.sub(scope, extra, marginRight);\n        }\n      } else {\n        if (!marginRight) {\n          marginRight = Exprs.sub(\n            scope,\n            extra,\n            Exprs.add(scope, right, marginLeft),\n          );\n        } else {\n          // overconstraint\n          right = Exprs.sub(scope, extra, marginRight);\n        }\n      }\n    } else {\n      if (!marginLeft) {\n        marginLeft = scope.zero;\n      }\n      if (!marginRight) {\n        marginRight = scope.zero;\n      }\n      if (!left && !right && !width) {\n        left = scope.zero;\n      }\n      if (!left && !width) {\n        width = this.autoWidth;\n        this.isAutoWidth = true;\n      } else if (!left && !right) {\n        left = scope.zero;\n      } else if (!width && !right) {\n        width = this.autoWidth;\n        this.isAutoWidth = true;\n      }\n      const remains = Exprs.sub(\n        scope,\n        parentWidth,\n        Exprs.add(\n          scope,\n          Exprs.add(scope, marginLeft, leftBP),\n          Exprs.add(scope, marginRight, rightBP),\n        ),\n      );\n      if (this.isAutoWidth) {\n        if (!maxWidth) {\n          // TODO: handle the case when right/left depends on width\n          maxWidth = Exprs.sub(scope, remains, left ? left : right);\n        }\n\n        // For multi-column layout, width is max-width.\n        if (\n          !this.vertical &&\n          (toExprAuto(scope, style[\"column-width\"], null) ||\n            toExprAuto(scope, style[\"column-count\"], null))\n        ) {\n          width = maxWidth;\n          this.isAutoWidth = false;\n        }\n      }\n      if (!left) {\n        left = Exprs.sub(scope, remains, Exprs.add(scope, right, width));\n      } else if (!width) {\n        width = Exprs.sub(scope, remains, Exprs.add(scope, left, right));\n      } else if (!right) {\n        right = Exprs.sub(scope, remains, Exprs.add(scope, left, width));\n      }\n    }\n\n    // snap-width is inherited\n    const snapWidthVal =\n      style[\"snap-width\"] ||\n      (this.parentInstance ? this.parentInstance.style[\"snap-width\"] : null);\n    const snapWidth = toExprZero(scope, snapWidthVal, parentWidth);\n    style[\"left\"] = new Css.Expr(left);\n    style[\"margin-left\"] = new Css.Expr(marginLeft);\n    style[\"border-left-width\"] = new Css.Expr(borderLeftWidth);\n    style[\"padding-left\"] = new Css.Expr(paddingLeft);\n    style[\"width\"] = new Css.Expr(width);\n    style[\"max-width\"] = new Css.Expr(maxWidth ? maxWidth : width);\n    style[\"padding-right\"] = new Css.Expr(paddingRight);\n    style[\"border-right-width\"] = new Css.Expr(borderRightWidth);\n    style[\"margin-right\"] = new Css.Expr(marginRight);\n    style[\"right\"] = new Css.Expr(right);\n    style[\"snap-width\"] = new Css.Expr(snapWidth);\n  }\n\n  protected initVertical(): void {\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    const parentWidth = this.parentInstance\n      ? this.parentInstance.style[\"width\"].toExpr(scope, null)\n      : null;\n    const parentHeight = this.parentInstance\n      ? this.parentInstance.style[\"height\"].toExpr(scope, null)\n      : null;\n    let top = toExprAuto(scope, style[\"top\"], parentHeight);\n    let marginTop = toExprAuto(scope, style[\"margin-top\"], parentWidth);\n    const borderTopWidth = toExprZeroBorder(\n      scope,\n      style[\"border-top-width\"],\n      style[\"border-top-style\"],\n      parentWidth,\n    );\n    const paddingTop = toExprZero(scope, style[\"padding-top\"], parentWidth);\n    let height = toExprAuto(scope, style[\"height\"], parentHeight);\n    let maxHeight = toExprAuto(scope, style[\"max-height\"], parentHeight);\n    const paddingBottom = toExprZero(\n      scope,\n      style[\"padding-bottom\"],\n      parentWidth,\n    );\n    const borderBottomWidth = toExprZeroBorder(\n      scope,\n      style[\"border-bottom-width\"],\n      style[\"border-bottom-style\"],\n      parentWidth,\n    );\n    let marginBottom = toExprAuto(scope, style[\"margin-bottom\"], parentWidth);\n    let bottom = toExprAuto(scope, style[\"bottom\"], parentHeight);\n    const topBP = Exprs.add(scope, borderTopWidth, paddingTop);\n    const bottomBP = Exprs.add(scope, borderBottomWidth, paddingBottom);\n    if (top && bottom && height) {\n      let extra = Exprs.sub(\n        scope,\n        parentHeight,\n        Exprs.add(\n          scope,\n          height,\n          Exprs.add(scope, Exprs.add(scope, top, topBP), bottomBP),\n        ),\n      );\n      if (!marginTop) {\n        extra = Exprs.sub(scope, extra, bottom);\n        if (!marginBottom) {\n          marginTop = Exprs.mul(scope, extra, new Exprs.Const(scope, 0.5));\n          marginBottom = marginTop;\n        } else {\n          marginTop = Exprs.sub(scope, extra, marginBottom);\n        }\n      } else {\n        if (!marginBottom) {\n          marginBottom = Exprs.sub(\n            scope,\n            extra,\n            Exprs.add(scope, bottom, marginTop),\n          );\n        } else {\n          // overconstraint\n          bottom = Exprs.sub(scope, extra, marginTop);\n        }\n      }\n    } else {\n      if (!marginTop) {\n        marginTop = scope.zero;\n      }\n      if (!marginBottom) {\n        marginBottom = scope.zero;\n      }\n      if (!top && !bottom && !height) {\n        top = scope.zero;\n      }\n      if (!top && !height) {\n        height = this.autoHeight;\n        this.isAutoHeight = true;\n      } else if (!top && !bottom) {\n        top = scope.zero;\n      } else if (!height && !bottom) {\n        height = this.autoHeight;\n        this.isAutoHeight = true;\n      }\n      const remains = Exprs.sub(\n        scope,\n        parentHeight,\n        Exprs.add(\n          scope,\n          Exprs.add(scope, marginTop, topBP),\n          Exprs.add(scope, marginBottom, bottomBP),\n        ),\n      );\n      if (this.isAutoHeight) {\n        if (!maxHeight) {\n          // TODO: handle the case when top/bottom depends on height\n          maxHeight = Exprs.sub(scope, remains, top ? top : bottom);\n        }\n\n        // For multi-column layout in vertical writing, height is max-height.\n        if (\n          this.vertical &&\n          (toExprAuto(scope, style[\"column-width\"], null) ||\n            toExprAuto(scope, style[\"column-count\"], null))\n        ) {\n          height = maxHeight;\n          this.isAutoHeight = false;\n        }\n      }\n      if (!top) {\n        top = Exprs.sub(scope, remains, Exprs.add(scope, bottom, height));\n      } else if (!height) {\n        height = Exprs.sub(scope, remains, Exprs.add(scope, bottom, top));\n      } else if (!bottom) {\n        bottom = Exprs.sub(scope, remains, Exprs.add(scope, top, height));\n      }\n    }\n\n    // snap-height is inherited\n    const snapHeightVal =\n      style[\"snap-height\"] ||\n      (this.parentInstance ? this.parentInstance.style[\"snap-height\"] : null);\n    const snapHeight = toExprZero(scope, snapHeightVal, parentWidth);\n    style[\"top\"] = new Css.Expr(top);\n    style[\"margin-top\"] = new Css.Expr(marginTop);\n    style[\"border-top-width\"] = new Css.Expr(borderTopWidth);\n    style[\"padding-top\"] = new Css.Expr(paddingTop);\n    style[\"height\"] = new Css.Expr(height);\n    style[\"max-height\"] = new Css.Expr(maxHeight ? maxHeight : height);\n    style[\"padding-bottom\"] = new Css.Expr(paddingBottom);\n    style[\"border-bottom-width\"] = new Css.Expr(borderBottomWidth);\n    style[\"margin-bottom\"] = new Css.Expr(marginBottom);\n    style[\"bottom\"] = new Css.Expr(bottom);\n    style[\"snap-height\"] = new Css.Expr(snapHeight);\n  }\n\n  private initColumns(): void {\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    const width = toExprAuto(\n      scope,\n      style[this.vertical ? \"height\" : \"width\"],\n      null,\n    );\n    let columnWidth = toExprAuto(scope, style[\"column-width\"], width);\n    let columnCount = toExprAuto(scope, style[\"column-count\"], null);\n    let columnGap = toExprNormal(scope, style[\"column-gap\"], null);\n    if (!columnGap) {\n      columnGap = new Exprs.Numeric(scope, 1, \"em\");\n    }\n    if (columnWidth && !columnCount) {\n      columnCount = new Exprs.Call(scope, \"floor\", [\n        Exprs.div(\n          scope,\n          Exprs.add(scope, width, columnGap),\n          Exprs.add(scope, columnWidth, columnGap),\n        ),\n      ]);\n      columnCount = new Exprs.Call(scope, \"max\", [scope.one, columnCount]);\n    }\n    if (!columnCount) {\n      columnCount = scope.one;\n    }\n    columnWidth = Exprs.sub(\n      scope,\n      Exprs.div(scope, Exprs.add(scope, width, columnGap), columnCount),\n      columnGap,\n    );\n    style[\"column-width\"] = new Css.Expr(columnWidth);\n    style[\"column-count\"] = new Css.Expr(columnCount);\n    style[\"column-gap\"] = new Css.Expr(columnGap);\n  }\n\n  private depends(\n    propName: string,\n    val: Exprs.Val,\n    context: Exprs.Context,\n  ): boolean {\n    return this.style[propName]\n      .toExpr(this.pageBox.scope, null)\n      .depend(val, context);\n  }\n\n  private init(context: Exprs.Context): void {\n    // If context does not implement InstanceHolder we would not be able to\n    // resolve \"partition.property\" names later.\n    const holder = context as InstanceHolder;\n    holder.registerInstance(this.pageBox.key, this);\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    const self = this;\n    const regionIds = this.parentInstance\n      ? this.parentInstance.getActiveRegions(context)\n      : null;\n    const cascMap = CssCascade.flattenCascadedStyle(\n      this.cascaded,\n      context,\n      regionIds,\n      false,\n      null,\n    );\n    this.vertical = CssCascade.isVertical(\n      cascMap,\n      context,\n      this.parentInstance ? this.parentInstance.vertical : false,\n    );\n    this.rtl = CssCascade.isRtl(\n      cascMap,\n      context,\n      this.parentInstance ? this.parentInstance.rtl : false,\n    );\n    CssCascade.convertToPhysical(\n      cascMap,\n      style,\n      this.vertical,\n      this.rtl,\n      (name, cascVal) => cascVal.value,\n    );\n    this.autoWidth = new Exprs.Native(\n      scope,\n      () => self.calculatedWidth,\n      \"autoWidth\",\n    );\n    this.autoHeight = new Exprs.Native(\n      scope,\n      () => self.calculatedHeight,\n      \"autoHeight\",\n    );\n    this.initHorizontal();\n    this.initVertical();\n    this.initColumns();\n    this.initEnabled();\n  }\n\n  getProp(context: Exprs.Context, name: string): Css.Val {\n    let val = this.style[name];\n    if (val) {\n      val = CssParser.evaluateCSSToCSS(context, val, name);\n    }\n    return val;\n  }\n\n  getPropAsNumber(context: Exprs.Context, name: string): number {\n    let val = this.style[name];\n    if (val) {\n      val = CssParser.evaluateCSSToCSS(context, val, name);\n    }\n    return Css.toNumber(val, context);\n  }\n\n  getSpecial(context: Exprs.Context, name: string): Css.Val[] {\n    const arr = CssCascade.getSpecial(this.cascaded, name);\n    if (arr) {\n      const result = [] as Css.Val[];\n      for (let i = 0; i < arr.length; i++) {\n        const v = arr[i].evaluate(context, \"\");\n        if (v && v !== Css.empty) {\n          result.push(v);\n        }\n      }\n      if (result.length) {\n        return result;\n      }\n    }\n    return null;\n  }\n\n  getActiveRegions(context: Exprs.Context): string[] {\n    const arr = this.getSpecial(context, \"region-id\");\n    if (arr) {\n      const result = [] as string[];\n      for (let i = 0; i < arr.length; i++) {\n        result[i] = arr[i].toString();\n      }\n      return result;\n    }\n    return null;\n  }\n\n  propagateProperty(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    name: string,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    this.propagatePropertyToElement(context, container.element, name, docFaces);\n  }\n\n  propagatePropertyToElement(\n    context: Exprs.Context,\n    element: Element,\n    name: string,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    let val = this.getProp(context, name);\n    if (val) {\n      if (\n        val.isNumeric() &&\n        Exprs.needUnitConversion((val as Css.Numeric).unit)\n      ) {\n        val = Css.convertNumericToPx(val, context);\n      }\n      if (name === \"font-family\") {\n        val = docFaces.filterFontFamily(val);\n      }\n      Base.setCSSProperty(element, name, val.toString());\n    }\n  }\n\n  propagateDelayedProperty(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    name: string,\n    delayedItems: Vtree.DelayedItem[],\n  ): void {\n    const val = this.getProp(context, name);\n    if (val) {\n      delayedItems.push(new Vtree.DelayedItem(container.element, name, val));\n    }\n  }\n\n  assignLeftPosition(context: Exprs.Context, container: Vtree.Container): void {\n    const left = this.getPropAsNumber(context, \"left\");\n    const marginLeft = this.getPropAsNumber(context, \"margin-left\");\n    const paddingLeft = this.getPropAsNumber(context, \"padding-left\");\n    const borderLeftWidth = this.getPropAsNumber(context, \"border-left-width\");\n    const width = this.getPropAsNumber(context, \"width\");\n    container.setHorizontalPosition(left, width);\n    Base.setCSSProperty(container.element, \"margin-left\", `${marginLeft}px`);\n    Base.setCSSProperty(container.element, \"padding-left\", `${paddingLeft}px`);\n    Base.setCSSProperty(\n      container.element,\n      \"border-left-width\",\n      `${borderLeftWidth}px`,\n    );\n    container.marginLeft = marginLeft;\n    container.borderLeft = borderLeftWidth;\n    container.paddingLeft = paddingLeft;\n  }\n\n  assignRightPosition(\n    context: Exprs.Context,\n    container: Vtree.Container,\n  ): void {\n    const right = this.getPropAsNumber(context, \"right\");\n    const snapWidth = this.getPropAsNumber(context, \"snap-height\");\n    const marginRight = this.getPropAsNumber(context, \"margin-right\");\n    let paddingRight = this.getPropAsNumber(context, \"padding-right\");\n    const borderRightWidth = this.getPropAsNumber(\n      context,\n      \"border-right-width\",\n    );\n    Base.setCSSProperty(container.element, \"margin-right\", `${marginRight}px`);\n    Base.setCSSProperty(\n      container.element,\n      \"padding-right\",\n      `${paddingRight}px`,\n    );\n    Base.setCSSProperty(\n      container.element,\n      \"border-right-width\",\n      `${borderRightWidth}px`,\n    );\n    container.marginRight = marginRight;\n    container.borderRight = borderRightWidth;\n    if (this.vertical && snapWidth > 0) {\n      const xpos = right + container.getInsetRight();\n      const r = xpos - Math.floor(xpos / snapWidth) * snapWidth;\n      if (r > 0) {\n        container.snapOffsetX = snapWidth - r;\n        paddingRight += container.snapOffsetX;\n      }\n    }\n    container.paddingRight = paddingRight;\n    container.snapWidth = snapWidth;\n  }\n\n  assignTopPosition(context: Exprs.Context, container: Vtree.Container): void {\n    const snapHeight = this.getPropAsNumber(context, \"snap-height\");\n    const top = this.getPropAsNumber(context, \"top\");\n    const marginTop = this.getPropAsNumber(context, \"margin-top\");\n    let paddingTop = this.getPropAsNumber(context, \"padding-top\");\n    const borderTopWidth = this.getPropAsNumber(context, \"border-top-width\");\n    container.top = top;\n    container.marginTop = marginTop;\n    container.borderTop = borderTopWidth;\n    container.snapHeight = snapHeight;\n    if (!this.vertical && snapHeight > 0) {\n      const ypos = top + container.getInsetTop();\n      const r = ypos - Math.floor(ypos / snapHeight) * snapHeight;\n      if (r > 0) {\n        container.snapOffsetY = snapHeight - r;\n        paddingTop += container.snapOffsetY;\n      }\n    }\n    container.paddingTop = paddingTop;\n    Base.setCSSProperty(container.element, \"top\", `${top}px`);\n    Base.setCSSProperty(container.element, \"margin-top\", `${marginTop}px`);\n    Base.setCSSProperty(container.element, \"padding-top\", `${paddingTop}px`);\n    Base.setCSSProperty(\n      container.element,\n      \"border-top-width\",\n      `${borderTopWidth}px`,\n    );\n  }\n\n  assignBottomPosition(\n    context: Exprs.Context,\n    container: Vtree.Container,\n  ): void {\n    const marginBottom = this.getPropAsNumber(context, \"margin-bottom\");\n    const paddingBottom = this.getPropAsNumber(context, \"padding-bottom\");\n    const borderBottomWidth = this.getPropAsNumber(\n      context,\n      \"border-bottom-width\",\n    );\n    const height =\n      this.getPropAsNumber(context, \"height\") - container.snapOffsetY;\n    Base.setCSSProperty(container.element, \"height\", `${height}px`);\n    Base.setCSSProperty(\n      container.element,\n      \"margin-bottom\",\n      `${marginBottom}px`,\n    );\n    Base.setCSSProperty(\n      container.element,\n      \"padding-bottom\",\n      `${paddingBottom}px`,\n    );\n    Base.setCSSProperty(\n      container.element,\n      \"border-bottom-width\",\n      `${borderBottomWidth}px`,\n    );\n    container.height = height - container.snapOffsetY;\n    container.marginBottom = marginBottom;\n    container.borderBottom = borderBottomWidth;\n    container.paddingBottom = paddingBottom;\n  }\n\n  assignBeforePosition(\n    context: Exprs.Context,\n    container: Vtree.Container,\n  ): void {\n    if (this.vertical) {\n      this.assignRightPosition(context, container);\n    } else {\n      this.assignTopPosition(context, container);\n    }\n  }\n\n  assignAfterPosition(\n    context: Exprs.Context,\n    container: Vtree.Container,\n  ): void {\n    if (this.vertical) {\n      this.assignLeftPosition(context, container);\n    } else {\n      this.assignBottomPosition(context, container);\n    }\n  }\n\n  assignStartEndPosition(\n    context: Exprs.Context,\n    container: Vtree.Container,\n  ): void {\n    if (this.vertical) {\n      this.assignTopPosition(context, container);\n      this.assignBottomPosition(context, container);\n    } else {\n      this.assignRightPosition(context, container);\n      this.assignLeftPosition(context, container);\n    }\n  }\n\n  sizeWithMaxHeight(context: Exprs.Context, container: Vtree.Container): void {\n    Base.setCSSProperty(container.element, \"border-top-width\", \"0px\");\n    let height = this.getPropAsNumber(context, \"max-height\");\n    if (this.isTopDependentOnAutoHeight) {\n      container.setVerticalPosition(0, height);\n    } else {\n      this.assignTopPosition(context, container);\n      height -= container.snapOffsetY;\n      container.height = height;\n      Base.setCSSProperty(container.element, \"height\", `${height}px`);\n    }\n  }\n\n  sizeWithMaxWidth(context: Exprs.Context, container: Vtree.Container): void {\n    Base.setCSSProperty(container.element, \"border-left-width\", \"0px\");\n    let width = this.getPropAsNumber(context, \"max-width\");\n    if (this.isRightDependentOnAutoWidth) {\n      container.setHorizontalPosition(0, width);\n    } else {\n      this.assignRightPosition(context, container);\n      width -= container.snapOffsetX;\n      container.width = width;\n      const right = this.getPropAsNumber(context, \"right\");\n      Base.setCSSProperty(container.element, \"right\", `${right}px`);\n      Base.setCSSProperty(container.element, \"width\", `${width}px`);\n    }\n  }\n\n  prepareContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n    clientLayout: Vtree.ClientLayout,\n  ): void {\n    if (!this.parentInstance || this.vertical != this.parentInstance.vertical) {\n      Base.setCSSProperty(\n        container.element,\n        \"writing-mode\",\n        this.vertical ? \"vertical-rl\" : \"horizontal-tb\",\n      );\n    }\n    if (this.vertical ? this.isAutoWidth : this.isAutoHeight) {\n      if (this.vertical) {\n        this.sizeWithMaxWidth(context, container);\n      } else {\n        this.sizeWithMaxHeight(context, container);\n      }\n    } else {\n      this.assignBeforePosition(context, container);\n      this.assignAfterPosition(context, container);\n    }\n    if (this.vertical ? this.isAutoHeight : this.isAutoWidth) {\n      if (this.vertical) {\n        this.sizeWithMaxHeight(context, container);\n      } else {\n        this.sizeWithMaxWidth(context, container);\n      }\n    } else {\n      this.assignStartEndPosition(context, container);\n    }\n    for (let i = 0; i < passPreProperties.length; i++) {\n      this.propagateProperty(\n        context,\n        container,\n        passPreProperties[i],\n        docFaces,\n      );\n    }\n  }\n\n  transferContentProps(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    for (let i = 0; i < passContentProperties.length; i++) {\n      this.propagateProperty(\n        context,\n        container,\n        passContentProperties[i],\n        docFaces,\n      );\n    }\n  }\n\n  transferSinglUriContentProps(\n    context: Exprs.Context,\n    element: Element,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    for (let i = 0; i < passSingleUriContentProperties.length; i++) {\n      this.propagatePropertyToElement(\n        context,\n        element,\n        passSingleUriContentProperties[i],\n        docFaces,\n      );\n    }\n  }\n\n  /**\n   * @param column (null when content comes from the content property)\n   */\n  finishContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    column: Vtree.Container,\n    columnCount: number,\n    clientLayout: Vtree.ClientLayout,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    if (this.vertical) {\n      this.calculatedWidth =\n        container.computedBlockSize + container.snapOffsetX;\n    } else {\n      this.calculatedHeight =\n        container.computedBlockSize + container.snapOffsetY;\n    }\n    const readHeight = (this.vertical || !column) && this.isAutoHeight;\n    const readWidth = (!this.vertical || !column) && this.isAutoWidth;\n    let bbox: Vtree.ClientRect = null;\n    if (readWidth || readHeight) {\n      if (readWidth) {\n        Base.setCSSProperty(container.element, \"width\", \"auto\");\n      }\n      if (readHeight) {\n        Base.setCSSProperty(container.element, \"height\", \"auto\");\n      }\n      bbox = clientLayout.getElementClientRect(\n        column ? column.element : container.element,\n      );\n      if (readWidth) {\n        this.calculatedWidth = Math.ceil(\n          bbox.right -\n            bbox.left -\n            container.paddingLeft -\n            container.borderLeft -\n            container.paddingRight -\n            container.borderRight,\n        );\n        if (this.vertical) {\n          this.calculatedWidth += container.snapOffsetX;\n        }\n      }\n      if (readHeight) {\n        this.calculatedHeight =\n          bbox.bottom -\n          bbox.top -\n          container.paddingTop -\n          container.borderTop -\n          container.paddingBottom -\n          container.borderBottom;\n        if (!this.vertical) {\n          this.calculatedHeight += container.snapOffsetY;\n        }\n      }\n    }\n    if (this.vertical ? this.isAutoHeight : this.isAutoWidth) {\n      this.assignStartEndPosition(context, container);\n    }\n    if (this.vertical ? this.isAutoWidth : this.isAutoHeight) {\n      if (\n        this.vertical\n          ? this.isRightDependentOnAutoWidth\n          : this.isTopDependentOnAutoHeight\n      ) {\n        this.assignBeforePosition(context, container);\n      }\n      this.assignAfterPosition(context, container);\n    }\n    if (columnCount > 1) {\n      const ruleWidth = this.getPropAsNumber(context, \"column-rule-width\");\n      const ruleStyle = this.getProp(context, \"column-rule-style\");\n      const ruleColor = this.getProp(context, \"column-rule-color\");\n      if (\n        ruleWidth > 0 &&\n        ruleStyle &&\n        ruleStyle != Css.ident.none &&\n        ruleColor != Css.ident.transparent\n      ) {\n        const columnGap = this.getPropAsNumber(context, \"column-gap\");\n        const containerSize = this.vertical\n          ? container.height\n          : container.width;\n        const border = this.vertical ? \"border-top\" : \"border-left\";\n        for (let i = 1; i < columnCount; i++) {\n          const pos =\n            ((containerSize + columnGap) * i) / columnCount -\n            columnGap / 2 +\n            container.paddingLeft -\n            ruleWidth / 2;\n          const size =\n            container.height + container.paddingTop + container.paddingBottom;\n          const rule = container.element.ownerDocument.createElement(\"div\");\n          Base.setCSSProperty(rule, \"position\", \"absolute\");\n          Base.setCSSProperty(rule, this.vertical ? \"left\" : \"top\", \"0px\");\n          Base.setCSSProperty(rule, this.vertical ? \"top\" : \"left\", `${pos}px`);\n          Base.setCSSProperty(rule, this.vertical ? \"height\" : \"width\", \"0px\");\n          Base.setCSSProperty(\n            rule,\n            this.vertical ? \"width\" : \"height\",\n            `${size}px`,\n          );\n          Base.setCSSProperty(\n            rule,\n            border,\n            `${ruleWidth}px ${ruleStyle.toString()}${\n              ruleColor ? ` ${ruleColor.toString()}` : \"\"\n            }`,\n          );\n          container.element.insertBefore(rule, container.element.firstChild);\n        }\n      }\n    }\n    for (let i = 0; i < passPostProperties.length; i++) {\n      this.propagateProperty(\n        context,\n        container,\n        passPostProperties[i],\n        docFaces,\n      );\n    }\n    for (let i = 0; i < delayedProperties.length; i++) {\n      this.propagateDelayedProperty(\n        context,\n        container,\n        delayedProperties[i],\n        page.delayedItems,\n      );\n    }\n  }\n\n  applyCascadeAndInit(\n    cascade: CssCascade.CascadeInstance,\n    docElementStyle: CssCascade.ElementStyle,\n  ): void {\n    const style = this.cascaded;\n    const specified = this.pageBox.specified;\n    for (const name in specified) {\n      if (CssCascade.isPropName(name)) {\n        CssCascade.setProp(style, name, CssCascade.getProp(specified, name));\n      }\n    }\n    if (this.pageBox.pseudoName == userAgentPageMasterPseudo) {\n      for (const name in docElementStyle) {\n        if (name.match(/^background-/) || name == \"writing-mode\") {\n          style[name] = docElementStyle[name];\n        }\n      }\n    }\n    if (this.pageBox.pseudoName == \"layout-host\") {\n      for (const name in docElementStyle) {\n        if (!name.match(/^background-/) && name != \"writing-mode\") {\n          style[name] = docElementStyle[name];\n        }\n      }\n    }\n    cascade.pushRule(this.pageBox.classes, null, style);\n    if (style[\"content\"]) {\n      style[\"content\"] = style[\"content\"].filterValue(\n        new CssCascade.ContentPropVisitor(\n          cascade,\n          null,\n          cascade.counterResolver,\n        ),\n      );\n    }\n    this.init(cascade.context);\n    for (const child of this.pageBox.children) {\n      const childInstance = child.createInstance(this);\n      childInstance.applyCascadeAndInit(cascade, docElementStyle);\n    }\n    cascade.popRule();\n  }\n\n  resolveAutoSizing(context: Exprs.Context): void {\n    // all implicit dependencies are set up at this point\n    if (this.isAutoWidth) {\n      this.isRightDependentOnAutoWidth =\n        this.depends(\"right\", this.autoWidth, context) ||\n        this.depends(\"margin-right\", this.autoWidth, context) ||\n        this.depends(\"border-right-width\", this.autoWidth, context) ||\n        this.depends(\"padding-right\", this.autoWidth, context);\n    }\n    if (this.isAutoHeight) {\n      this.isTopDependentOnAutoHeight =\n        this.depends(\"top\", this.autoHeight, context) ||\n        this.depends(\"margin-top\", this.autoHeight, context) ||\n        this.depends(\"border-top-width\", this.autoHeight, context) ||\n        this.depends(\"padding-top\", this.autoHeight, context);\n    }\n    for (const childInstance of this.children) {\n      childInstance.resolveAutoSizing(context);\n    }\n  }\n}\n\n/**\n * Properties that are passed through before the layout.\n */\nexport const passPreProperties = [\n  \"border-left-style\",\n  \"border-right-style\",\n  \"border-top-style\",\n  \"border-bottom-style\",\n  \"border-left-color\",\n  \"border-right-color\",\n  \"border-top-color\",\n  \"border-bottom-color\",\n  \"outline-style\",\n  \"outline-color\",\n  \"outline-width\",\n  \"overflow\",\n  \"visibility\",\n];\n\n/**\n * Properties that are passed through after the layout.\n */\nexport const passPostProperties = [\n  \"border-top-left-radius\",\n  \"border-top-right-radius\",\n  \"border-bottom-right-radius\",\n  \"border-bottom-left-radius\",\n  \"border-image-source\",\n  \"border-image-slice\",\n  \"border-image-width\",\n  \"border-image-outset\",\n  \"border-image-repeat\",\n  \"background-attachment\",\n  \"background-color\",\n  \"background-image\",\n  \"background-repeat\",\n  \"background-position\",\n  \"background-clip\",\n  \"background-origin\",\n  \"background-size\",\n  \"opacity\",\n  \"z-index\",\n  \"background-blend-mode\",\n  \"isolation\",\n  \"mix-blend-mode\",\n  \"filter\",\n];\n\n/**\n * Only passed when there is content assigned by the content property.\n */\nexport const passContentProperties = [\n  \"color\",\n  \"font-family\",\n  \"font-size\",\n  \"font-style\",\n  \"font-weight\",\n  \"font-variant\",\n  \"line-height\",\n  \"letter-spacing\",\n  \"text-align\",\n  \"text-decoration\",\n  \"text-indent\",\n  \"text-transform\",\n  \"white-space\",\n  \"word-spacing\",\n  \"font-feature-settings\",\n  \"font-kerning\",\n  \"font-size-adjust\",\n  \"font-variant-east-asian\",\n  \"font-stretch\",\n  \"text-decoration-color\",\n  \"text-decoration-line\",\n  \"text-decoration-skip\",\n  \"text-decoration-style\",\n  \"text-emphasis\",\n  \"text-emphasis-color\",\n  \"text-emphasis-position\",\n  \"text-emphasis-style\",\n  \"text-shadow\",\n  \"text-underline-position\",\n];\n\nexport const passSingleUriContentProperties = [\n  \"width\",\n  \"height\",\n  \"image-resolution\",\n  \"object-fit\",\n  \"object-position\",\n];\n\nexport const delayedProperties = [\"transform\", \"transform-origin\"];\n\nexport const userAgentPageMasterPseudo = \"background-host\";\n\nexport class RootPageBoxInstance extends PageBoxInstance<RootPageBox> {\n  constructor(pageBox: RootPageBox) {\n    super(null, pageBox);\n  }\n\n  /**\n   * @override\n   */\n  applyCascadeAndInit(\n    cascade: CssCascade.CascadeInstance,\n    docElementStyle: CssCascade.ElementStyle,\n  ): void {\n    super.applyCascadeAndInit(cascade, docElementStyle);\n\n    // Sort page masters using order and specificity.\n    const pageMasters = this.children;\n    (pageMasters as PageMasterInstance[]).sort(\n      (a, b) =>\n        (b.pageBox as any).specificity - (a.pageBox as any).specificity || // probably cause NaN\n        a.pageBox.index - b.pageBox.index,\n    );\n  }\n}\n\nexport class PageMasterInstance<\n  P extends PageMaster = PageMaster<PageMasterInstance<any>>\n> extends PageBoxInstance<P> {\n  pageMasterInstance: PageMasterInstance;\n\n  constructor(parentInstance: PageBoxInstance, pageBox: P) {\n    super(parentInstance, pageBox);\n    this.pageMasterInstance = this;\n  }\n\n  /**\n   * @override\n   */\n  boxSpecificEnabled(enabled: Exprs.Val): Exprs.Val {\n    const pageMaster = this.pageBox.pageMaster;\n    if (pageMaster.condition) {\n      enabled = Exprs.and(pageMaster.scope, enabled, pageMaster.condition);\n    }\n    return enabled;\n  }\n\n  /**\n   * Called after layout of contents of the page has done to adjust the overall\n   * page layout. Override in subclasses.\n   */\n  adjustPageLayout(\n    context: Exprs.Context,\n    page: Vtree.Page,\n    clientLayout: Vtree.ClientLayout,\n  ) {}\n}\n\nexport class PartitionGroupInstance extends PageBoxInstance<PartitionGroup> {\n  pageMasterInstance: PageMasterInstance;\n\n  constructor(parentInstance: PageBoxInstance, pageBox: PageBox) {\n    super(parentInstance, pageBox);\n    this.pageMasterInstance = parentInstance.pageMasterInstance;\n  }\n}\n\nexport class PartitionInstance<\n  P extends Partition = Partition<PartitionInstance<any>>\n> extends PageBoxInstance<P> {\n  pageMasterInstance: PageMasterInstance;\n\n  constructor(parentInstance: PageBoxInstance, pageBox: P) {\n    super(parentInstance, pageBox);\n    this.pageMasterInstance = parentInstance.pageMasterInstance;\n  }\n\n  processPartitionList(\n    enabled: Exprs.Val,\n    listVal: Css.Val,\n    conflicting: boolean,\n  ): Exprs.Val {\n    let list: Css.Val[] = null;\n    if (listVal instanceof Css.Ident) {\n      list = [listVal];\n    }\n    if (listVal instanceof Css.CommaList) {\n      list = (listVal as Css.CommaList).values;\n    }\n    if (list) {\n      const scope = this.pageBox.scope;\n      for (let i = 0; i < list.length; i++) {\n        if (list[i] instanceof Css.Ident) {\n          const qname = Exprs.makeQualifiedName(\n            (list[i] as Css.Ident).name,\n            \"enabled\",\n          );\n          let term: Exprs.Val = new Exprs.Named(scope, qname);\n          if (conflicting) {\n            term = new Exprs.Not(scope, term);\n          }\n          enabled = Exprs.and(scope, enabled, term);\n        }\n      }\n    }\n    return enabled;\n  }\n\n  /**\n   * @override\n   */\n  boxSpecificEnabled(enabled: Exprs.Val): Exprs.Val {\n    const scope = this.pageBox.scope;\n    const style = this.style;\n    const required =\n      toExprBool(scope, style[\"required\"], scope._false) !== scope._false;\n    if (required || this.isAutoHeight) {\n      const flowName = toExprIdent(scope, style[\"flow-from\"], \"body\");\n      const hasContent = new Exprs.Call(scope, \"has-content\", [flowName]);\n      enabled = Exprs.and(scope, enabled, hasContent);\n    }\n    enabled = this.processPartitionList(\n      enabled,\n      style[\"required-partitions\"],\n      false,\n    );\n    enabled = this.processPartitionList(\n      enabled,\n      style[\"conflicting-partitions\"],\n      true,\n    );\n    if (required) {\n      const pmEnabledVal = this.pageMasterInstance.style[\"enabled\"];\n      let pmEnabled = pmEnabledVal\n        ? pmEnabledVal.toExpr(scope, null)\n        : scope._true;\n      pmEnabled = Exprs.and(scope, pmEnabled, enabled);\n      this.pageMasterInstance.style[\"enabled\"] = new Css.Expr(pmEnabled);\n    }\n    return enabled;\n  }\n\n  /**\n   * @override\n   */\n  prepareContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n    clientLayout: Vtree.ClientLayout,\n  ): void {\n    Base.setCSSProperty(container.element, \"overflow\", \"hidden\"); // default value\n    super.prepareContainer(context, container, page, docFaces, clientLayout);\n  }\n}\n\n//--------------------- parsing -----------------------\nexport class PageBoxParserHandler extends CssParser.SlaveParserHandler\n  implements CssValidator.PropertyReceiver {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    public readonly target: PageBox,\n    public readonly validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope, owner, false);\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.validatorSet.validatePropertyAndHandleShorthand(\n      name,\n      value,\n      important,\n      this,\n    );\n  }\n\n  /**\n   * @override\n   */\n  unknownProperty(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  invalidPropertyValue(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY_VALUE ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    this.target.specified[name] = new CssCascade.CascadeValue(\n      value,\n      important\n        ? CssParser.SPECIFICITY_STYLE\n        : CssParser.SPECIFICITY_STYLE_IMPORTANT,\n    );\n  }\n}\n\nexport class PartitionParserHandler extends PageBoxParserHandler {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    target: Partition,\n    validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope, owner, target, validatorSet);\n  }\n}\n\nexport class PartitionGroupParserHandler extends PageBoxParserHandler {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    target: PartitionGroup,\n    validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope, owner, target, validatorSet);\n    target.specified[\"width\"] = new CssCascade.CascadeValue(\n      Css.hundredPercent,\n      0,\n    );\n    target.specified[\"height\"] = new CssCascade.CascadeValue(\n      Css.hundredPercent,\n      0,\n    );\n  }\n\n  /**\n   * @override\n   */\n  startPartitionRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    const partition = new Partition(\n      this.scope,\n      name,\n      pseudoName,\n      classes,\n      this.target,\n    );\n    const handler = new PartitionParserHandler(\n      this.scope,\n      this.owner,\n      partition,\n      this.validatorSet,\n    );\n    this.owner.pushHandler(handler);\n  }\n\n  /**\n   * @override\n   */\n  startPartitionGroupRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    const partitionGroup = new PartitionGroup(\n      this.scope,\n      name,\n      pseudoName,\n      classes,\n      this.target,\n    );\n    const handler = new PartitionGroupParserHandler(\n      this.scope,\n      this.owner,\n      partitionGroup,\n      this.validatorSet,\n    );\n    this.owner.pushHandler(handler);\n  }\n}\n\nexport class PageMasterParserHandler extends PageBoxParserHandler {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    target: PageMaster,\n    validatorSet: CssValidator.ValidatorSet,\n  ) {\n    super(scope, owner, target, validatorSet);\n  }\n\n  /**\n   * @override\n   */\n  startPartitionRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    const partition = new Partition(\n      this.scope,\n      name,\n      pseudoName,\n      classes,\n      this.target,\n    );\n    const handler = new PartitionParserHandler(\n      this.scope,\n      this.owner,\n      partition,\n      this.validatorSet,\n    );\n    this.owner.pushHandler(handler);\n  }\n\n  /**\n   * @override\n   */\n  startPartitionGroupRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    const partitionGroup = new PartitionGroup(\n      this.scope,\n      name,\n      pseudoName,\n      classes,\n      this.target,\n    );\n    const handler = new PartitionGroupParserHandler(\n      this.scope,\n      this.owner,\n      partitionGroup,\n      this.validatorSet,\n    );\n    this.owner.pushHandler(handler);\n  }\n}\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CssPage - `@page` rule (CSS Paged Media) support https://drafts.csswg.org/css-page/\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Constants from \"./constants\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssValidator from \"./css-validator\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as PageMaster from \"./page-master\";\nimport * as Sizing from \"./sizing\";\nimport * as Vtree from \"./vtree\";\n\n/**\n * Resolve page progression direction from writing-mode and direction.\n */\nexport function resolvePageProgression(\n  style: CssCascade.ElementStyle,\n): Constants.PageProgression {\n  let writingMode = style[\"writing-mode\"];\n  writingMode = writingMode && writingMode.value;\n  let direction = style[\"direction\"];\n  direction = direction && direction.value;\n  if (\n    writingMode === Css.ident.vertical_lr ||\n    (writingMode !== Css.ident.vertical_rl && direction !== Css.ident.rtl)\n  ) {\n    return Constants.PageProgression.LTR;\n  } else {\n    return Constants.PageProgression.RTL;\n  }\n}\nexport type PageSize = {\n  width: Css.Numeric;\n  height: Css.Numeric;\n};\n\n/**\n * Named page sizes.\n */\nexport const pageSizes: { [key: string]: PageSize } = {\n  a5: { width: new Css.Numeric(148, \"mm\"), height: new Css.Numeric(210, \"mm\") },\n  a4: { width: new Css.Numeric(210, \"mm\"), height: new Css.Numeric(297, \"mm\") },\n  a3: { width: new Css.Numeric(297, \"mm\"), height: new Css.Numeric(420, \"mm\") },\n  b5: { width: new Css.Numeric(176, \"mm\"), height: new Css.Numeric(250, \"mm\") },\n  b4: { width: new Css.Numeric(250, \"mm\"), height: new Css.Numeric(353, \"mm\") },\n  \"jis-b5\": {\n    width: new Css.Numeric(182, \"mm\"),\n    height: new Css.Numeric(257, \"mm\"),\n  },\n  \"jis-b4\": {\n    width: new Css.Numeric(257, \"mm\"),\n    height: new Css.Numeric(364, \"mm\"),\n  },\n  letter: {\n    width: new Css.Numeric(8.5, \"in\"),\n    height: new Css.Numeric(11, \"in\"),\n  },\n  legal: {\n    width: new Css.Numeric(8.5, \"in\"),\n    height: new Css.Numeric(14, \"in\"),\n  },\n  ledger: {\n    width: new Css.Numeric(11, \"in\"),\n    height: new Css.Numeric(17, \"in\"),\n  },\n};\n\n/**\n * Default value for line width of printer marks\n */\nexport const defaultPrinterMarkLineWidth: Css.Numeric = new Css.Numeric(\n  0.24,\n  \"pt\",\n);\n\n/**\n * Default value for distance between an edge of the page and printer marks\n */\nexport const defaultPrinterMarkOffset: Css.Numeric = new Css.Numeric(3, \"mm\");\n\n/**\n * Default value for line length of the (shorter) line of a crop mark and the\n * shorter line of a cross mark\n */\nexport const defaultPrinterMarkLineLength: Css.Numeric = new Css.Numeric(\n  10,\n  \"mm\",\n);\n\n/**\n * Default value for bleed offset (= defaultPrinterMarkOffset +\n * defaultPrinterMarkLineLength)\n */\nexport const defaultBleedOffset: Css.Numeric = new Css.Numeric(3 + 10, \"mm\");\n\nexport type PageSizeAndBleed = {\n  width: Css.Numeric;\n  height: Css.Numeric;\n  bleed: Css.Numeric;\n  bleedOffset: Css.Numeric;\n};\n\nexport function resolvePageSizeAndBleed(style: {\n  [key: string]: CssCascade.CascadeValue;\n}): PageSizeAndBleed {\n  // default value (fit to viewport, no bleed)\n  const pageSizeAndBleed: PageSizeAndBleed = {\n    width: Css.fullWidth,\n    height: Css.fullHeight,\n    bleed: Css.numericZero,\n    bleedOffset: Css.numericZero,\n  };\n  const size: CssCascade.CascadeValue = style[\"size\"];\n\n  if (!size || size.value === Css.ident.auto) {\n    // if size is auto, fit to the viewport (use default value)\n  } else {\n    /** !type {!Css.Val} */\n    const value = size.value;\n    let val1: Css.Val;\n    let val2: Css.Val;\n    if (value.isSpaceList()) {\n      val1 = (value as Css.SpaceList).values[0];\n      val2 = (value as Css.SpaceList).values[1];\n    } else {\n      val1 = value;\n      val2 = null;\n    }\n    if (val1.isNumeric()) {\n      // <length>{1,2}\n      pageSizeAndBleed.width = val1 as Css.Numeric;\n      pageSizeAndBleed.height = (val2 || val1) as Css.Numeric;\n    } else {\n      // <page-size> || [ portrait | landscape ]\n      const s =\n        (val1 as any).name && pageSizes[(val1 as Css.Ident).name.toLowerCase()];\n      if (!s) {\n        // portrait or landscape is specified alone. fallback to fit to the\n        // viewport (use default value)\n      } else if (val2 && val2 === Css.ident.landscape) {\n        // swap\n        pageSizeAndBleed.width = s.height;\n        pageSizeAndBleed.height = s.width;\n      } else {\n        // return {\n        pageSizeAndBleed.width = s.width;\n        pageSizeAndBleed.height = s.height;\n      }\n    }\n  }\n  const marks = style[\"marks\"];\n  if (marks && marks.value !== Css.ident.none) {\n    pageSizeAndBleed.bleedOffset = defaultBleedOffset;\n  }\n  const bleed = style[\"bleed\"];\n  if (!bleed || bleed.value === Css.ident.auto) {\n    // \"('auto' value) Computes to 6pt if marks has crop and to zero\n    // otherwise.\" https://drafts.csswg.org/css-page/#valdef-page-bleed-auto\n    if (marks) {\n      let hasCrop = false;\n      if (marks.value.isSpaceList()) {\n        hasCrop = (marks.value as Css.SpaceList).values.some(\n          (v) => v === Css.ident.crop,\n        );\n      } else {\n        hasCrop = marks.value === Css.ident.crop;\n      }\n      if (hasCrop) {\n        pageSizeAndBleed.bleed = new Css.Numeric(6, \"pt\");\n      }\n    }\n  } else if (bleed.value && bleed.value.isNumeric()) {\n    pageSizeAndBleed.bleed = bleed.value as Css.Numeric;\n  }\n  return pageSizeAndBleed;\n}\n\nexport type EvaluatedPageSizeAndBleed = {\n  pageWidth: number;\n  pageHeight: number;\n  bleed: number;\n  bleedOffset: number;\n  cropOffset: number;\n};\n\n/**\n * Evaluate actual page width, height and bleed from style specified in page\n * context.\n */\nexport function evaluatePageSizeAndBleed(\n  pageSizeAndBleed: PageSizeAndBleed,\n  context: Exprs.Context,\n): EvaluatedPageSizeAndBleed {\n  const evaluated = {} as EvaluatedPageSizeAndBleed;\n  const bleed =\n    pageSizeAndBleed.bleed.num *\n    context.queryUnitSize(pageSizeAndBleed.bleed.unit, false);\n  const bleedOffset =\n    pageSizeAndBleed.bleedOffset.num *\n    context.queryUnitSize(pageSizeAndBleed.bleedOffset.unit, false);\n  const cropOffset = bleed + bleedOffset;\n  const width = pageSizeAndBleed.width;\n  if (width === Css.fullWidth) {\n    if (context.pref.defaultPaperSize) {\n      evaluated.pageWidth =\n        context.pref.defaultPaperSize.width *\n        context.queryUnitSize(\"px\", false);\n    } else {\n      evaluated.pageWidth =\n        (context.pref.spreadView\n          ? Math.floor(context.viewportWidth / 2) - context.pref.pageBorder\n          : context.viewportWidth) -\n        cropOffset * 2;\n    }\n  } else {\n    evaluated.pageWidth = width.num * context.queryUnitSize(width.unit, false);\n  }\n  const height = pageSizeAndBleed.height;\n  if (height === Css.fullHeight) {\n    if (context.pref.defaultPaperSize) {\n      evaluated.pageHeight =\n        context.pref.defaultPaperSize.height *\n        context.queryUnitSize(\"px\", false);\n    } else {\n      evaluated.pageHeight = context.viewportHeight - cropOffset * 2;\n    }\n  } else {\n    evaluated.pageHeight =\n      height.num * context.queryUnitSize(height.unit, false);\n  }\n  evaluated.bleed = bleed;\n  evaluated.bleedOffset = bleedOffset;\n  evaluated.cropOffset = cropOffset;\n  return evaluated;\n}\n\n/**\n * Create an 'svg' element for a printer mark.\n */\nexport function createPrinterMarkSvg(\n  doc: Document,\n  width: number,\n  height: number,\n): Element {\n  const mark = doc.createElementNS(Base.NS.SVG, \"svg\");\n  mark.setAttribute(\"width\", width);\n  mark.setAttribute(\"height\", height);\n  mark.style.position = \"absolute\";\n  return mark;\n}\n\n/**\n * Create an SVG element for a printer mark line.\n * @param elementType Specifies which type of element to create. Default value\n *     is \"polyline\".\n */\nexport function createPrinterMarkElement(\n  doc: Document,\n  lineWidth: number,\n  elementType?: string,\n): Element {\n  elementType = elementType || \"polyline\";\n  const line = doc.createElementNS(Base.NS.SVG, elementType);\n  line.setAttribute(\"stroke\", \"black\");\n  line.setAttribute(\"stroke-width\", lineWidth);\n  line.setAttribute(\"fill\", \"none\");\n  return line;\n}\n\n/**\n * Position of a corner mark\n * @enum {string}\n */\nexport enum CornerMarkPosition {\n  TOP_LEFT = \"top left\",\n  TOP_RIGHT = \"top right\",\n  BOTTOM_LEFT = \"bottom left\",\n  BOTTOM_RIGHT = \"bottom right\",\n}\n\n/**\n * Create a corner mark.\n */\nexport function createCornerMark(\n  doc: Document,\n  position: CornerMarkPosition,\n  lineWidth: number,\n  cropMarkLineLength: number,\n  bleed: number,\n  offset: number,\n): Element {\n  let bleedMarkLineLength = cropMarkLineLength;\n\n  // bleed mark line should be longer than bleed + 2mm\n  if (bleedMarkLineLength <= bleed + 2 * Exprs.defaultUnitSizes[\"mm\"]) {\n    bleedMarkLineLength = bleed + cropMarkLineLength / 2;\n  }\n  const maxLineLength = Math.max(cropMarkLineLength, bleedMarkLineLength);\n  const svgWidth = bleed + maxLineLength + lineWidth / 2;\n  const mark = createPrinterMarkSvg(doc, svgWidth, svgWidth);\n  let points1 = [\n    [0, bleed + cropMarkLineLength],\n    [cropMarkLineLength, bleed + cropMarkLineLength],\n    [cropMarkLineLength, bleed + cropMarkLineLength - bleedMarkLineLength],\n  ];\n\n  // reflect with respect to y=x\n  let points2 = points1.map((p) => [p[1], p[0]]);\n  if (\n    position === CornerMarkPosition.TOP_RIGHT ||\n    position === CornerMarkPosition.BOTTOM_RIGHT\n  ) {\n    // reflect with respect to a vertical axis\n    points1 = points1.map((p) => [bleed + maxLineLength - p[0], p[1]]);\n    points2 = points2.map((p) => [bleed + maxLineLength - p[0], p[1]]);\n  }\n  if (\n    position === CornerMarkPosition.BOTTOM_LEFT ||\n    position === CornerMarkPosition.BOTTOM_RIGHT\n  ) {\n    // reflect with respect to a vertical axis\n    points1 = points1.map((p) => [p[0], bleed + maxLineLength - p[1]]);\n    points2 = points2.map((p) => [p[0], bleed + maxLineLength - p[1]]);\n  }\n  const line1 = createPrinterMarkElement(doc, lineWidth);\n  line1.setAttribute(\"points\", points1.map((p) => p.join(\",\")).join(\" \"));\n  mark.appendChild(line1);\n  const line2 = createPrinterMarkElement(doc, lineWidth);\n  line2.setAttribute(\"points\", points2.map((p) => p.join(\",\")).join(\" \"));\n  mark.appendChild(line2);\n  position.split(\" \").forEach((side) => {\n    (mark as any).style[side] = `${offset}px`;\n  });\n  return mark;\n}\n\n/**\n * Position of a cross mark\n * @enum {string}\n */\nexport enum CrossMarkPosition {\n  TOP = \"top\",\n  BOTTOM = \"bottom\",\n  LEFT = \"left\",\n  RIGHT = \"right\",\n}\n\n/**\n * Create a cross mark.\n */\nexport function createCrossMark(\n  doc: Document,\n  position: CrossMarkPosition,\n  lineWidth: number,\n  lineLength: number,\n  offset: number,\n): Element {\n  const longLineLength = lineLength * 2;\n  let width: number;\n  let height: number;\n  if (\n    position === CrossMarkPosition.TOP ||\n    position === CrossMarkPosition.BOTTOM\n  ) {\n    width = longLineLength;\n    height = lineLength;\n  } else {\n    width = lineLength;\n    height = longLineLength;\n  }\n  const mark = createPrinterMarkSvg(doc, width, height);\n  const horizontalLine = createPrinterMarkElement(doc, lineWidth);\n  horizontalLine.setAttribute(\n    \"points\",\n    `0,${height / 2} ${width},${height / 2}`,\n  );\n  mark.appendChild(horizontalLine);\n  const verticalLine = createPrinterMarkElement(doc, lineWidth);\n  verticalLine.setAttribute(\"points\", `${width / 2},0 ${width / 2},${height}`);\n  mark.appendChild(verticalLine);\n  const circle = createPrinterMarkElement(doc, lineWidth, \"circle\");\n  circle.setAttribute(\"cx\", width / 2);\n  circle.setAttribute(\"cy\", height / 2);\n  circle.setAttribute(\"r\", lineLength / 4);\n  mark.appendChild(circle);\n  let opposite: CrossMarkPosition;\n  switch (position) {\n    case CrossMarkPosition.TOP:\n      opposite = CrossMarkPosition.BOTTOM;\n      break;\n    case CrossMarkPosition.BOTTOM:\n      opposite = CrossMarkPosition.TOP;\n      break;\n    case CrossMarkPosition.LEFT:\n      opposite = CrossMarkPosition.RIGHT;\n      break;\n    case CrossMarkPosition.RIGHT:\n      opposite = CrossMarkPosition.LEFT;\n      break;\n  }\n  Object.keys(CrossMarkPosition).forEach((key) => {\n    const side = CrossMarkPosition[key];\n    if (side === position) {\n      (mark as any).style[side] = `${offset}px`;\n    } else if (side !== opposite) {\n      (mark as any).style[side] = \"0\";\n      (mark as any).style[`margin-${side}`] = \"auto\";\n    }\n  });\n  return mark;\n}\n\n/**\n * Add printer marks to the page.\n */\nexport function addPrinterMarks(\n  cascadedPageStyle: CssCascade.ElementStyle,\n  evaluatedPageSizeAndBleed: EvaluatedPageSizeAndBleed,\n  page: Vtree.Page,\n  context: Exprs.Context,\n): void {\n  let crop = false;\n  let cross = false;\n  const marks = cascadedPageStyle[\"marks\"];\n  if (marks) {\n    const value = marks.value;\n    if (value.isSpaceList()) {\n      value.values.forEach((v) => {\n        if (v === Css.ident.crop) {\n          crop = true;\n        } else if (v === Css.ident.cross) {\n          cross = true;\n        }\n      });\n    } else if (value === Css.ident.crop) {\n      crop = true;\n    } else if (value === Css.ident.cross) {\n      cross = true;\n    }\n  }\n  if (!crop && !cross) {\n    return;\n  }\n  const container = page.container;\n  const doc = container.ownerDocument as Document;\n  Asserts.assert(doc);\n  const bleed = evaluatedPageSizeAndBleed.bleed;\n  const lineWidth = Css.toNumber(defaultPrinterMarkLineWidth, context);\n  const printerMarkOffset = Css.toNumber(defaultPrinterMarkOffset, context);\n  const lineLength = Css.toNumber(defaultPrinterMarkLineLength, context);\n\n  if (bleed) {\n    const bgcolor = cascadedPageStyle[\"background-color\"];\n    if (bgcolor && bgcolor.value) {\n      page.bleedBox.style.backgroundColor = bgcolor.value.stringValue();\n    }\n  }\n\n  // corner marks\n  if (crop) {\n    Object.keys(CornerMarkPosition).forEach((key) => {\n      const position = CornerMarkPosition[key];\n      const mark = createCornerMark(\n        doc,\n        position,\n        lineWidth,\n        lineLength,\n        bleed,\n        printerMarkOffset,\n      );\n      container.appendChild(mark);\n    });\n  }\n\n  // cross marks\n  if (cross) {\n    Object.keys(CrossMarkPosition).forEach((key) => {\n      const position = CrossMarkPosition[key];\n      const mark = createCrossMark(\n        doc,\n        position,\n        lineWidth,\n        lineLength,\n        printerMarkOffset,\n      );\n      container.appendChild(mark);\n    });\n  }\n}\n\n/**\n * Properties transfered from the PageRuleMaster to the PageRulePartition\n */\nexport const propertiesAppliedToPartition = (() => {\n  const sides = [\n    \"left\",\n    \"right\",\n    \"top\",\n    \"bottom\",\n    \"before\",\n    \"after\",\n    \"start\",\n    \"end\",\n    \"block-start\",\n    \"block-end\",\n    \"inline-start\",\n    \"inline-end\",\n  ];\n  const props = {\n    width: true,\n    height: true,\n    \"block-size\": true,\n    \"inline-size\": true,\n    margin: true,\n    padding: true,\n    border: true,\n    outline: true,\n    \"outline-width\": true,\n    \"outline-style\": true,\n    \"outline-color\": true,\n  };\n  sides.forEach((side) => {\n    props[`margin-${side}`] = true;\n    props[`padding-${side}`] = true;\n    props[`border-${side}-width`] = true;\n    props[`border-${side}-style`] = true;\n    props[`border-${side}-color`] = true;\n  });\n  return props;\n})();\n\n/**\n * Represents position of a margin box along the variable dimension of the page.\n * START and END can be interpreted as 'inline-start' and 'inline-end' in\n * horizontal and vertical writing modes. For example, for top margin boxes\n * (@top-left-corner, @top-left, @top-center, @top-right, @top-right-corner),\n * @top-left corresponds to START, @top-center to CENTER, and @top-right to END.\n * The corner boxes (@top-left-corner and @top-right-corner) have a 'null'\n * position.\n * @enum {string}\n */\nexport enum MarginBoxPositionAlongVariableDimension {\n  START = \"start\",\n  CENTER = \"center\",\n  END = \"end\",\n}\n\nexport type PageMarginBoxInformation = {\n  order: number;\n  isInTopRow: boolean;\n  isInBottomRow: boolean;\n  isInLeftColumn: boolean;\n  isInRightColumn: boolean;\n  positionAlongVariableDimension: MarginBoxPositionAlongVariableDimension;\n};\n\n/**\n * Page-margin boxes.\n * @dict\n */\nexport const pageMarginBoxes: { [key: string]: PageMarginBoxInformation } = {\n  \"top-left-corner\": {\n    order: 1,\n    isInTopRow: true,\n    isInBottomRow: false,\n    isInLeftColumn: true,\n    isInRightColumn: true,\n    positionAlongVariableDimension: null,\n  },\n  \"top-left\": {\n    order: 2,\n    isInTopRow: true,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.START,\n  },\n  \"top-center\": {\n    order: 3,\n    isInTopRow: true,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.CENTER,\n  },\n  \"top-right\": {\n    order: 4,\n    isInTopRow: true,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension: MarginBoxPositionAlongVariableDimension.END,\n  },\n  \"top-right-corner\": {\n    order: 5,\n    isInTopRow: true,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: true,\n    positionAlongVariableDimension: null,\n  },\n  \"right-top\": {\n    order: 6,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: true,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.START,\n  },\n  \"right-middle\": {\n    order: 7,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: true,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.CENTER,\n  },\n  \"right-bottom\": {\n    order: 8,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: false,\n    isInRightColumn: true,\n    positionAlongVariableDimension: MarginBoxPositionAlongVariableDimension.END,\n  },\n  \"bottom-right-corner\": {\n    order: 9,\n    isInTopRow: false,\n    isInBottomRow: true,\n    isInLeftColumn: false,\n    isInRightColumn: true,\n    positionAlongVariableDimension: null,\n  },\n  \"bottom-right\": {\n    order: 10,\n    isInTopRow: false,\n    isInBottomRow: true,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension: MarginBoxPositionAlongVariableDimension.END,\n  },\n  \"bottom-center\": {\n    order: 11,\n    isInTopRow: false,\n    isInBottomRow: true,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.CENTER,\n  },\n  \"bottom-left\": {\n    order: 12,\n    isInTopRow: false,\n    isInBottomRow: true,\n    isInLeftColumn: false,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.START,\n  },\n  \"bottom-left-corner\": {\n    order: 13,\n    isInTopRow: false,\n    isInBottomRow: true,\n    isInLeftColumn: true,\n    isInRightColumn: false,\n    positionAlongVariableDimension: null,\n  },\n  \"left-bottom\": {\n    order: 14,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: true,\n    isInRightColumn: false,\n    positionAlongVariableDimension: MarginBoxPositionAlongVariableDimension.END,\n  },\n  \"left-middle\": {\n    order: 15,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: true,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.CENTER,\n  },\n  \"left-top\": {\n    order: 16,\n    isInTopRow: false,\n    isInBottomRow: false,\n    isInLeftColumn: true,\n    isInRightColumn: false,\n    positionAlongVariableDimension:\n      MarginBoxPositionAlongVariableDimension.START,\n  },\n};\n\n/**\n * Names for page-margin boxes order in the default painting order.\n */\nexport const pageMarginBoxNames: string[] = (() => {\n  const boxes = pageMarginBoxes;\n  return Object.keys(boxes).sort((a, b) => boxes[a].order - boxes[b].order);\n})();\n\n/**\n * Indicates that the page master is generated for `@page` rules.\n */\nexport const pageRuleMasterPseudoName = \"vivliostyle-page-rule-master\";\n\n/**\n * Key for properties in margin contexts.\n * Styles in margin contexts are stored in pageStyle[\"_marginBoxes\"][(margin\n * box's name)].\n */\nexport const marginBoxesKey: string = \"_marginBoxes\";\n\n/**\n * Represent a page master generated for `@page` rules\n * @param style Cascaded style for `@page` rules\n */\nexport class PageRuleMaster extends PageMaster.PageMaster<\n  PageRuleMasterInstance\n> {\n  private bodyPartitionKey: string;\n  private pageMarginBoxes = {} as {\n    [key: string]: PageMarginBoxPartition;\n  };\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    parent: PageMaster.RootPageBox,\n    style: CssCascade.ElementStyle,\n  ) {\n    super(scope, null, pageRuleMasterPseudoName, [], parent, null, 0);\n    const pageSize = resolvePageSizeAndBleed(style as any);\n    const partition = new PageRulePartition(this.scope, this, style, pageSize);\n    this.bodyPartitionKey = partition.key;\n    this.createPageMarginBoxes(style);\n    this.applySpecified(style, pageSize);\n  }\n\n  /**\n   * Create page-margin boxes\n   */\n  createPageMarginBoxes(style: CssCascade.ElementStyle) {\n    const marginBoxesMap = style[marginBoxesKey];\n    if (marginBoxesMap) {\n      const self = this;\n      pageMarginBoxNames.forEach((name) => {\n        if (marginBoxesMap[name]) {\n          self.pageMarginBoxes[name] = new PageMarginBoxPartition(\n            self.scope,\n            self,\n            name,\n            style,\n          );\n        }\n      });\n    }\n  }\n\n  /**\n   * Transfer cascaded style for `@page` rules to 'specified' style of this\n   * PageBox\n   */\n  private applySpecified(style: CssCascade.ElementStyle, pageSize: PageSize) {\n    this.specified[\"position\"] = new CssCascade.CascadeValue(\n      Css.ident.relative,\n      0,\n    );\n    this.specified[\"width\"] = new CssCascade.CascadeValue(pageSize.width, 0);\n    this.specified[\"height\"] = new CssCascade.CascadeValue(pageSize.height, 0);\n    for (const name in style) {\n      if (!propertiesAppliedToPartition[name] && name !== \"background-clip\") {\n        this.specified[name] = style[name];\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance): PageRuleMasterInstance {\n    return new PageRuleMasterInstance(parentInstance, this);\n  }\n}\n\n/**\n * Represent a partition placed in a PageRuleMaster\n * @param style Cascaded style for `@page` rules\n */\nexport class PageRulePartition extends PageMaster.Partition<\n  PageRulePartitionInstance\n> {\n  constructor(\n    scope: Exprs.LexicalScope,\n    parent: PageRuleMaster,\n    style: CssCascade.ElementStyle,\n    public readonly pageSize: PageSize,\n  ) {\n    super(scope, null, null, [], parent);\n    this.specified[\"z-index\"] = new CssCascade.CascadeValue(new Css.Int(0), 0);\n    this.applySpecified(style);\n  }\n\n  /**\n   * Transfer cascaded style for `@page` rules to 'specified' style of this\n   * PageBox\n   */\n  private applySpecified(style: CssCascade.ElementStyle) {\n    this.specified[\"flow-from\"] = new CssCascade.CascadeValue(\n      Css.getName(\"body\"),\n      0,\n    );\n\n    // Use absolute positioning so that this partition's margins don't collapse\n    // with its parent's margins\n    this.specified[\"position\"] = new CssCascade.CascadeValue(\n      Css.ident.absolute,\n      0,\n    );\n    this.specified[\"overflow\"] = new CssCascade.CascadeValue(\n      Css.ident.visible,\n      0,\n    );\n    for (const prop in propertiesAppliedToPartition) {\n      if (propertiesAppliedToPartition.hasOwnProperty(prop)) {\n        this.specified[prop] = style[prop];\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance): PageMaster.PageBoxInstance {\n    return new PageRulePartitionInstance(parentInstance, this);\n  }\n}\n\n/**\n * Represent a partition for a page-margin box\n */\nexport class PageMarginBoxPartition extends PageMaster.Partition<\n  PageMarginBoxPartitionInstance\n> {\n  constructor(\n    scope: Exprs.LexicalScope,\n    parent: PageRuleMaster,\n    public readonly marginBoxName: string,\n    style: CssCascade.ElementStyle,\n  ) {\n    super(scope, null, null, [], parent);\n    this.applySpecified(style);\n  }\n\n  /**\n   * Transfer cascaded style for `@page` rules to 'specified' style of this\n   * PageMarginBox\n   */\n  applySpecified(style: CssCascade.ElementStyle) {\n    const ownStyle = style[marginBoxesKey][\n      this.marginBoxName\n    ] as CssCascade.ElementStyle;\n\n    // Inherit properties in the page context to the page-margin context\n    for (const prop in style) {\n      const val = style[prop] as CssCascade.CascadeValue;\n      const ownVal = ownStyle[prop] as CssCascade.CascadeValue;\n      if (\n        CssCascade.inheritedProps[prop] ||\n        (ownVal && ownVal.value === Css.ident.inherit)\n      ) {\n        this.specified[prop] = val;\n      }\n    }\n    for (const prop in ownStyle) {\n      if (Object.prototype.hasOwnProperty.call(ownStyle, prop)) {\n        const val = ownStyle[prop] as CssCascade.CascadeValue;\n        if (val && val.value !== Css.ident.inherit) {\n          this.specified[prop] = val;\n        }\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  createInstance(parentInstance): PageMaster.PageBoxInstance {\n    return new PageMarginBoxPartitionInstance(parentInstance, this);\n  }\n}\n\n//---------------------------- Instance --------------------------------\nexport type PageAreaDimension = {\n  borderBoxWidth: Exprs.Val;\n  borderBoxHeight: Exprs.Val;\n  marginTop: Exprs.Val;\n  marginBottom: Exprs.Val;\n  marginLeft: Exprs.Val;\n  marginRight: Exprs.Val;\n};\n\nexport class PageRuleMasterInstance extends PageMaster.PageMasterInstance<\n  PageRuleMaster\n> {\n  pageAreaDimension: PageAreaDimension | null = null;\n  pageMarginBoxInstances: {\n    [key: string]: PageMarginBoxPartitionInstance;\n  } = {};\n\n  constructor(\n    parentInstance: PageMaster.PageBoxInstance,\n    pageRuleMaster: PageRuleMaster,\n  ) {\n    super(parentInstance, pageRuleMaster);\n  }\n\n  /**\n   * @override\n   */\n  applyCascadeAndInit(\n    cascade: CssCascade.CascadeInstance,\n    docElementStyle: CssCascade.ElementStyle,\n  ): void {\n    const style = this.cascaded;\n    for (const name in docElementStyle) {\n      if (Object.prototype.hasOwnProperty.call(docElementStyle, name)) {\n        switch (name) {\n          case \"writing-mode\":\n          case \"direction\":\n            style[name] = docElementStyle[name];\n        }\n      }\n    }\n    super.applyCascadeAndInit(cascade, docElementStyle);\n  }\n\n  /**\n   * @override\n   */\n  initHorizontal(): void {\n    const style = this.style;\n    style[\"left\"] = Css.numericZero;\n    style[\"margin-left\"] = Css.numericZero;\n    style[\"border-left-width\"] = Css.numericZero;\n    style[\"padding-left\"] = Css.numericZero;\n    style[\"padding-right\"] = Css.numericZero;\n    style[\"border-right-width\"] = Css.numericZero;\n    style[\"margin-right\"] = Css.numericZero;\n    style[\"right\"] = Css.numericZero;\n  }\n\n  /**\n   * @override\n   */\n  initVertical(): void {\n    const style = this.style;\n\n    // Shift 1px to workaround Chrome printing bug\n    // style[\"top\"] = new Css.Numeric(-1, \"px\");\n    style[\"top\"] = Css.numericZero;\n    style[\"margin-top\"] = Css.numericZero;\n    style[\"border-top-width\"] = Css.numericZero;\n    style[\"padding-top\"] = Css.numericZero;\n    style[\"padding-bottom\"] = Css.numericZero;\n    style[\"border-bottom-width\"] = Css.numericZero;\n    style[\"margin-bottom\"] = Css.numericZero;\n    style[\"bottom\"] = Css.numericZero;\n  }\n\n  setPageAreaDimension(dim: PageAreaDimension) {\n    this.pageAreaDimension = dim;\n    const style = this.style;\n    style[\"width\"] = new Css.Expr(dim.borderBoxWidth);\n    style[\"height\"] = new Css.Expr(dim.borderBoxHeight);\n    style[\"padding-left\"] = new Css.Expr(dim.marginLeft);\n    style[\"padding-right\"] = new Css.Expr(dim.marginRight);\n    style[\"padding-top\"] = new Css.Expr(dim.marginTop);\n    style[\"padding-bottom\"] = new Css.Expr(dim.marginBottom);\n  }\n\n  /**\n   * @override\n   */\n  adjustPageLayout(\n    context: Exprs.Context,\n    page: Vtree.Page,\n    clientLayout: Vtree.ClientLayout,\n  ) {\n    const marginBoxContainers = page.marginBoxes;\n    const horizontalDimensions = {\n      start: this.pageAreaDimension.marginLeft,\n      end: this.pageAreaDimension.marginRight,\n      extent: this.pageAreaDimension.borderBoxWidth,\n    };\n    const verticalDimensions = {\n      start: this.pageAreaDimension.marginTop,\n      end: this.pageAreaDimension.marginBottom,\n      extent: this.pageAreaDimension.borderBoxHeight,\n    };\n    this.sizeMarginBoxesAlongVariableDimension(\n      marginBoxContainers.top,\n      true,\n      horizontalDimensions,\n      context,\n      clientLayout,\n    );\n    this.sizeMarginBoxesAlongVariableDimension(\n      marginBoxContainers.bottom,\n      true,\n      horizontalDimensions,\n      context,\n      clientLayout,\n    );\n    this.sizeMarginBoxesAlongVariableDimension(\n      marginBoxContainers.left,\n      false,\n      verticalDimensions,\n      context,\n      clientLayout,\n    );\n    this.sizeMarginBoxesAlongVariableDimension(\n      marginBoxContainers.right,\n      false,\n      verticalDimensions,\n      context,\n      clientLayout,\n    );\n  }\n\n  /**\n   * Determine and set margin boxes' sizes along variable dimension using an\n   * algorithm specified in CSS Paged Media spec.\n   * @param marginBoxContainers Containers corresponding to the target margin\n   *     boxes in one page edge (top, bottom, left, right)\n   * @param isHorizontal Indicates if the target margin boxes are on the\n   *     horizontal edge (top or bottom) or not (left or right).\n   * @param dimensions Page dimensions. start: margin-left or margin-top. end:\n   *     margin-right or margin-bottom. extent: border-box width or height of\n   *     the page area (= available width or height for the target margin boxes)\n   */\n  private sizeMarginBoxesAlongVariableDimension(\n    marginBoxContainers: { [key: string]: Vtree.Container },\n    isHorizontal: boolean,\n    dimensions: { start: Exprs.Val; end: Exprs.Val; extent: Exprs.Val },\n    context: Exprs.Context,\n    clientLayout: Vtree.ClientLayout,\n  ) {\n    const START = MarginBoxPositionAlongVariableDimension.START;\n    const CENTER = MarginBoxPositionAlongVariableDimension.CENTER;\n    const END = MarginBoxPositionAlongVariableDimension.END;\n\n    // prepare parameters\n    const scope = this.pageBox.scope;\n    const containers: {\n      [key in MarginBoxPositionAlongVariableDimension]?: Vtree.Container;\n    } = {};\n    const boxInstances: {\n      [key in MarginBoxPositionAlongVariableDimension]?: PageMarginBoxPartitionInstance;\n    } = {};\n    const boxParams: {\n      [key in MarginBoxPositionAlongVariableDimension]?: MarginBoxSizingParam;\n    } = {};\n    for (const name in marginBoxContainers) {\n      const boxInfo = pageMarginBoxes[name];\n      if (boxInfo) {\n        const container = marginBoxContainers[name];\n        const boxInstance = this.pageMarginBoxInstances[name];\n        const boxParam = new SingleBoxMarginBoxSizingParam(\n          container,\n          (boxInstance as any).style,\n          isHorizontal,\n          scope,\n          clientLayout,\n        );\n        containers[boxInfo.positionAlongVariableDimension] = container;\n        boxInstances[boxInfo.positionAlongVariableDimension] = boxInstance;\n        boxParams[boxInfo.positionAlongVariableDimension] = boxParam;\n      }\n    }\n\n    // determine sizes\n    const evaluatedDim = {\n      start: dimensions.start.evaluate(context) as number,\n      end: dimensions.end.evaluate(context) as number,\n      extent: dimensions.extent.evaluate(context) as number,\n    };\n    let sizes = this.getSizesOfMarginBoxesAlongVariableDimension(\n      boxParams,\n      evaluatedDim.extent,\n    );\n    let needRecalculate: boolean = false;\n\n    // Check max-width/max-height\n    const maxOuterSizes: {\n      [key in MarginBoxPositionAlongVariableDimension]?: number;\n    } = {};\n    Object.keys(containers).forEach((n) => {\n      const name = n as MarginBoxPositionAlongVariableDimension;\n      const maxSize = PageMaster.toExprAuto(\n        scope,\n        boxInstances[name].style[isHorizontal ? \"max-width\" : \"max-height\"],\n        dimensions.extent,\n      );\n      if (maxSize) {\n        const evaluatedMaxSize = maxSize.evaluate(context) as number;\n        if (sizes[name] > evaluatedMaxSize) {\n          const p = (boxParams[name] = new FixedSizeMarginBoxSizingParam(\n            containers[name],\n            boxInstances[name].style,\n            isHorizontal,\n            scope,\n            clientLayout,\n            evaluatedMaxSize,\n          ));\n          maxOuterSizes[name] = p.getOuterSize();\n          needRecalculate = true;\n        }\n      }\n    });\n    if (needRecalculate) {\n      sizes = this.getSizesOfMarginBoxesAlongVariableDimension(\n        boxParams,\n        evaluatedDim.extent,\n      );\n      needRecalculate = false;\n      [START, CENTER, END].forEach((name) => {\n        sizes[name] = maxOuterSizes[name] || sizes[name];\n      });\n    }\n\n    // Check min-width/min-height\n    const minOuterSizes: {\n      [key in MarginBoxPositionAlongVariableDimension]?: number;\n    } = {};\n    Object.keys(containers).forEach((n) => {\n      const name = n as MarginBoxPositionAlongVariableDimension;\n      const minSize = PageMaster.toExprAuto(\n        scope,\n        boxInstances[name].style[isHorizontal ? \"min-width\" : \"min-height\"],\n        dimensions.extent,\n      );\n      if (minSize) {\n        const evaluatedMinSize = minSize.evaluate(context) as number;\n        if (sizes[name] < evaluatedMinSize) {\n          const p = (boxParams[name] = new FixedSizeMarginBoxSizingParam(\n            containers[name],\n            boxInstances[name].style,\n            isHorizontal,\n            scope,\n            clientLayout,\n            evaluatedMinSize,\n          ));\n          minOuterSizes[name] = p.getOuterSize();\n          needRecalculate = true;\n        }\n      }\n    });\n    if (needRecalculate) {\n      sizes = this.getSizesOfMarginBoxesAlongVariableDimension(\n        boxParams,\n        evaluatedDim.extent,\n      );\n      [START, CENTER, END].forEach((name) => {\n        sizes[name] = minOuterSizes[name] || sizes[name];\n      });\n    }\n\n    // set sizes\n    const endEdge = evaluatedDim.start + evaluatedDim.extent;\n    const startEndSum =\n      evaluatedDim.start + (evaluatedDim.start + evaluatedDim.extent);\n    [START, CENTER, END].forEach((name) => {\n      const outerSize = sizes[name];\n      if (outerSize) {\n        const container = containers[name];\n        let offset = 0;\n        switch (name) {\n          case START:\n            offset = isHorizontal ? container.left : container.top;\n            break;\n          case CENTER:\n            offset = (startEndSum - outerSize) / 2;\n            break;\n          case END:\n            offset = endEdge - outerSize;\n            break;\n        }\n        if (isHorizontal) {\n          container.setHorizontalPosition(\n            offset,\n            outerSize - container.getInsetLeft() - container.getInsetRight(),\n          );\n        } else {\n          container.setVerticalPosition(\n            offset,\n            outerSize - container.getInsetTop() - container.getInsetBottom(),\n          );\n        }\n      }\n    });\n  }\n\n  private getSizesOfMarginBoxesAlongVariableDimension(\n    boxParams: {\n      [key in MarginBoxPositionAlongVariableDimension]?: MarginBoxSizingParam;\n    },\n    availableSize: number,\n  ): { [key in MarginBoxPositionAlongVariableDimension]?: number } {\n    const startBoxParam =\n      boxParams[MarginBoxPositionAlongVariableDimension.START];\n    const centerBoxParam =\n      boxParams[MarginBoxPositionAlongVariableDimension.CENTER];\n    const endBoxParam = boxParams[MarginBoxPositionAlongVariableDimension.END];\n    const sizes: {\n      [key in MarginBoxPositionAlongVariableDimension]?: number;\n    } = {};\n    if (!centerBoxParam) {\n      const startEndSizes = this.distributeAutoMarginBoxSizes(\n        startBoxParam,\n        endBoxParam,\n        availableSize,\n      );\n      if (startEndSizes.xSize) {\n        sizes[MarginBoxPositionAlongVariableDimension.START] =\n          startEndSizes.xSize;\n      }\n      if (startEndSizes.ySize) {\n        sizes[MarginBoxPositionAlongVariableDimension.END] =\n          startEndSizes.ySize;\n      }\n    } else {\n      const params = [startBoxParam, endBoxParam].filter((p) => p);\n      const startEndBoxParam = params.length\n        ? new MultipleBoxesMarginBoxSizingParam(params)\n        : null;\n      const centerSizes = this.distributeAutoMarginBoxSizes(\n        centerBoxParam,\n        startEndBoxParam,\n        availableSize,\n      );\n      if (centerSizes.xSize) {\n        sizes[MarginBoxPositionAlongVariableDimension.CENTER] =\n          centerSizes.xSize;\n      }\n      const centerSize = centerSizes.xSize || centerBoxParam.getOuterSize();\n      const startEndAutoSize = (availableSize - centerSize) / 2;\n      if (startBoxParam && startBoxParam.hasAutoSize()) {\n        sizes[MarginBoxPositionAlongVariableDimension.START] = startEndAutoSize;\n      }\n      if (endBoxParam && endBoxParam.hasAutoSize()) {\n        sizes[MarginBoxPositionAlongVariableDimension.END] = startEndAutoSize;\n      }\n    }\n    return sizes;\n  }\n\n  /**\n   * Distribute auto margin sizes among two margin boxes using an algorithm\n   * specified in CSS Paged Media spec.\n   * @param x Parameter for the first margin box. null if the box is not\n   *     generated.\n   * @param y Parameter for the second margin box. null if the box is not\n   *     generated.\n   * @param availableSize Available size for the margin boxes.\n   * @returns Determined sizes for the two boxes. Each value is present only\n   *     when the size of the corresponding box is 'auto'.\n   */\n  private distributeAutoMarginBoxSizes(\n    x: MarginBoxSizingParam,\n    y: MarginBoxSizingParam,\n    availableSize: number,\n  ): { xSize: number | null; ySize: number | null } {\n    const result: { xSize: number | null; ySize: number | null } = {\n      xSize: null,\n      ySize: null,\n    };\n    if (x && y) {\n      if (x.hasAutoSize() && y.hasAutoSize()) {\n        const xOuterMaxContentSize = x.getOuterMaxContentSize();\n        const yOuterMaxContentSize = y.getOuterMaxContentSize();\n        if (xOuterMaxContentSize > 0 && yOuterMaxContentSize > 0) {\n          const maxContentSizeSum = xOuterMaxContentSize + yOuterMaxContentSize;\n          if (maxContentSizeSum < availableSize) {\n            result.xSize =\n              (availableSize * xOuterMaxContentSize) / maxContentSizeSum;\n          } else {\n            const xOuterMinContentSize = x.getOuterMinContentSize();\n            const yOuterMinContentSize = y.getOuterMinContentSize();\n            const minContentSizeSum =\n              xOuterMinContentSize + yOuterMinContentSize;\n            if (minContentSizeSum < availableSize) {\n              result.xSize =\n                xOuterMinContentSize +\n                ((availableSize - minContentSizeSum) *\n                  (xOuterMaxContentSize - xOuterMinContentSize)) /\n                  (maxContentSizeSum - minContentSizeSum);\n            } else if (minContentSizeSum > 0) {\n              result.xSize =\n                (availableSize * xOuterMinContentSize) / minContentSizeSum;\n            }\n          }\n          if (result.xSize > 0) {\n            result.ySize = availableSize - result.xSize;\n          }\n        } else if (xOuterMaxContentSize > 0) {\n          result.xSize = availableSize;\n        } else if (yOuterMaxContentSize > 0) {\n          result.ySize = availableSize;\n        }\n      } else if (x.hasAutoSize()) {\n        result.xSize = Math.max(availableSize - y.getOuterSize(), 0);\n      } else if (y.hasAutoSize()) {\n        result.ySize = Math.max(availableSize - x.getOuterSize(), 0);\n      }\n    } else if (x) {\n      if (x.hasAutoSize()) {\n        result.xSize = availableSize;\n      }\n    } else if (y) {\n      if (y.hasAutoSize()) {\n        result.ySize = availableSize;\n      }\n    }\n    return result;\n  }\n\n  /**\n   * @override\n   */\n  prepareContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n    clientLayout: Vtree.ClientLayout,\n  ): void {\n    super.prepareContainer(context, container, page, docFaces, clientLayout);\n\n    // Add an attribute to the element so that it can be refered from external\n    // style sheets.\n    container.element.setAttribute(\"data-vivliostyle-page-box\", true);\n  }\n}\n\n/**\n * Interface used for parameters passed to distributeAutoMarginBoxSizes method.\n */\ninterface MarginBoxSizingParam {\n  hasAutoSize(): boolean;\n\n  getOuterMaxContentSize(): number;\n\n  getOuterMinContentSize(): number;\n\n  getOuterSize(): number;\n}\n\n/**\n * MarginBoxSizingParam for a single page-margin box.\n * @param container A container corresponding to the target margin box.\n * @param style Styles specified to the target margin box.\n */\nclass SingleBoxMarginBoxSizingParam implements MarginBoxSizingParam {\n  private hasAutoSize_: boolean;\n  private size: { [key in Sizing.Size]: number } | null = null;\n\n  constructor(\n    protected readonly container: Vtree.Container,\n    style: { [key: string]: Css.Val },\n    protected readonly isHorizontal: boolean,\n    scope: Exprs.LexicalScope,\n    private readonly clientLayout: Vtree.ClientLayout,\n  ) {\n    this.hasAutoSize_ = !PageMaster.toExprAuto(\n      scope,\n      style[isHorizontal ? \"width\" : \"height\"],\n      new Exprs.Numeric(scope, 0, \"px\"),\n    );\n  }\n\n  /**\n   *  @override\n   */\n  hasAutoSize(): boolean {\n    return this.hasAutoSize_;\n  }\n\n  private getSize(): { [key in Sizing.Size]: number } {\n    if (!this.size) {\n      const sizes = this.isHorizontal\n        ? [Sizing.Size.MAX_CONTENT_WIDTH, Sizing.Size.MIN_CONTENT_WIDTH]\n        : [Sizing.Size.MAX_CONTENT_HEIGHT, Sizing.Size.MIN_CONTENT_HEIGHT];\n      this.size = Sizing.getSize(\n        this.clientLayout,\n        this.container.element,\n        sizes,\n      );\n    }\n    return this.size;\n  }\n\n  /**\n   * @override\n   */\n  getOuterMaxContentSize(): number {\n    const size = this.getSize();\n    if (this.isHorizontal) {\n      return (\n        this.container.getInsetLeft() +\n        size[Sizing.Size.MAX_CONTENT_WIDTH] +\n        this.container.getInsetRight()\n      );\n    } else {\n      return (\n        this.container.getInsetTop() +\n        size[Sizing.Size.MAX_CONTENT_HEIGHT] +\n        this.container.getInsetBottom()\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  getOuterMinContentSize(): number {\n    const size = this.getSize();\n    if (this.isHorizontal) {\n      return (\n        this.container.getInsetLeft() +\n        size[Sizing.Size.MIN_CONTENT_WIDTH] +\n        this.container.getInsetRight()\n      );\n    } else {\n      return (\n        this.container.getInsetTop() +\n        size[Sizing.Size.MIN_CONTENT_HEIGHT] +\n        this.container.getInsetBottom()\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  getOuterSize(): number {\n    if (this.isHorizontal) {\n      return (\n        this.container.getInsetLeft() +\n        this.container.width +\n        this.container.getInsetRight()\n      );\n    } else {\n      return (\n        this.container.getInsetTop() +\n        this.container.height +\n        this.container.getInsetBottom()\n      );\n    }\n  }\n}\n\n/**\n * MarginBoxSizingParam with which multiple margin boxes are treated as one\n * margin box. Each method querying a dimension returns the maximum of the boxes\n * multiplied by the number of the boxes.\n * @param params MarginBoxSizingParam's of the target margin boxes.\n */\nclass MultipleBoxesMarginBoxSizingParam implements MarginBoxSizingParam {\n  constructor(private readonly params: MarginBoxSizingParam[]) {}\n\n  /**\n   * @override\n   */\n  hasAutoSize(): boolean {\n    return this.params.some((p) => p.hasAutoSize());\n  }\n\n  /**\n   *  @override\n   */\n  getOuterMaxContentSize(): number {\n    const sizes = this.params.map((p) => p.getOuterMaxContentSize());\n    return Math.max.apply(null, sizes) * sizes.length;\n  }\n\n  /**\n   *  @override\n   */\n  getOuterMinContentSize(): number {\n    const sizes = this.params.map((p) => p.getOuterMinContentSize());\n    return Math.max.apply(null, sizes) * sizes.length;\n  }\n\n  /**\n   *  @override\n   */\n  getOuterSize(): number {\n    const sizes = this.params.map((p) => p.getOuterSize());\n    return Math.max.apply(null, sizes) * sizes.length;\n  }\n}\n\n/**\n * MarginBoxSizingParam for a single page-margin box with a fixed size along the\n * variable dimension.\n * @param container A container corresponding to the target margin box.\n * @param style Styles specified to the target margin box.\n * @param size The fixed size (width or height) along the variable dimension.\n */\nclass FixedSizeMarginBoxSizingParam extends SingleBoxMarginBoxSizingParam {\n  private fixedSize: number;\n\n  constructor(\n    container: Vtree.Container,\n    style: { [key: string]: Css.Val },\n    isHorizontal: boolean,\n    scope: Exprs.LexicalScope,\n    clientLayout: Vtree.ClientLayout,\n    size: number,\n  ) {\n    super(container, style, isHorizontal, scope, clientLayout);\n    this.fixedSize = size;\n  }\n\n  /**\n   * @override\n   */\n  hasAutoSize(): boolean {\n    return false;\n  }\n\n  /**\n   *  @override\n   */\n  getOuterMaxContentSize(): number {\n    return this.getOuterSize();\n  }\n\n  /**\n   *  @override\n   */\n  getOuterMinContentSize(): number {\n    return this.getOuterSize();\n  }\n\n  /**\n   * @override\n   */\n  getOuterSize(): number {\n    if (this.isHorizontal) {\n      return (\n        this.container.getInsetLeft() +\n        this.fixedSize +\n        this.container.getInsetRight()\n      );\n    } else {\n      return (\n        this.container.getInsetTop() +\n        this.fixedSize +\n        this.container.getInsetBottom()\n      );\n    }\n  }\n}\n\nexport class PageRulePartitionInstance extends PageMaster.PartitionInstance<\n  PageRulePartition\n> {\n  borderBoxWidth: Exprs.Val = null;\n  borderBoxHeight: Exprs.Val = null;\n  marginTop: Exprs.Val = null;\n  marginRight: Exprs.Val = null;\n  marginBottom: Exprs.Val = null;\n  marginLeft: Exprs.Val = null;\n\n  constructor(\n    parentInstance: PageMaster.PageBoxInstance,\n    pageRulePartition: PageRulePartition,\n  ) {\n    super(parentInstance, pageRulePartition);\n  }\n\n  /**\n   * @override\n   */\n  applyCascadeAndInit(\n    cascade: CssCascade.CascadeInstance,\n    docElementStyle: CssCascade.ElementStyle,\n  ): void {\n    const style = this.cascaded;\n    for (const name in docElementStyle) {\n      if (Object.prototype.hasOwnProperty.call(docElementStyle, name)) {\n        if (name.match(/^column.*$/) || name.match(/^background-/)) {\n          style[name] = docElementStyle[name];\n        }\n      }\n    }\n    super.applyCascadeAndInit(cascade, docElementStyle);\n    const pageRuleMasterInstance = this\n      .parentInstance as PageRuleMasterInstance;\n    pageRuleMasterInstance.setPageAreaDimension({\n      borderBoxWidth: this.borderBoxWidth,\n      borderBoxHeight: this.borderBoxHeight,\n      marginTop: this.marginTop,\n      marginRight: this.marginRight,\n      marginBottom: this.marginBottom,\n      marginLeft: this.marginLeft,\n    });\n  }\n\n  /**\n   * @override\n   */\n  initHorizontal(): void {\n    const dim = this.resolvePageBoxDimensions({\n      start: \"left\",\n      end: \"right\",\n      extent: \"width\",\n    });\n    this.borderBoxWidth = dim.borderBoxExtent;\n    this.marginLeft = dim.marginStart;\n    this.marginRight = dim.marginEnd;\n  }\n\n  /**\n   * @override\n   */\n  initVertical(): void {\n    const dim = this.resolvePageBoxDimensions({\n      start: \"top\",\n      end: \"bottom\",\n      extent: \"height\",\n    });\n    this.borderBoxHeight = dim.borderBoxExtent;\n    this.marginTop = dim.marginStart;\n    this.marginBottom = dim.marginEnd;\n  }\n\n  /**\n   * Calculate page dimensions as specified in CSS Paged Media\n   * (http://dev.w3.org/csswg/css-page/#page-model) Page border box extent and\n   * margins. Since the containing block can be resized in the over-constrained\n   * case, the sum of these values is not necessarily same to the original page\n   * dimension specified in the page at-rules.\n   */\n  private resolvePageBoxDimensions(names: {\n    start: string;\n    end: string;\n    extent: string;\n  }): {\n    borderBoxExtent: Exprs.Val;\n    marginStart: Exprs.Val;\n    marginEnd: Exprs.Val;\n  } {\n    const style = this.style;\n    const pageSize = this.pageBox.pageSize;\n    const scope = this.pageBox.scope;\n    const startSide = names.start;\n    const endSide = names.end;\n    const extentName = names.extent;\n    const pageExtent = pageSize[extentName].toExpr(scope, null);\n    let extent = PageMaster.toExprAuto(scope, style[extentName], pageExtent);\n    let marginStart = PageMaster.toExprAuto(\n      scope,\n      style[`margin-${startSide}`],\n      pageExtent,\n    );\n    let marginEnd = PageMaster.toExprAuto(\n      scope,\n      style[`margin-${endSide}`],\n      pageExtent,\n    );\n    const paddingStart = PageMaster.toExprZero(\n      scope,\n      style[`padding-${startSide}`],\n      pageExtent,\n    );\n    const paddingEnd = PageMaster.toExprZero(\n      scope,\n      style[`padding-${endSide}`],\n      pageExtent,\n    );\n    const borderStartWidth = PageMaster.toExprZeroBorder(\n      scope,\n      style[`border-${startSide}-width`],\n      style[`border-${startSide}-style`],\n      pageExtent,\n    );\n    const borderEndWidth = PageMaster.toExprZeroBorder(\n      scope,\n      style[`border-${endSide}-width`],\n      style[`border-${endSide}-style`],\n      pageExtent,\n    );\n    let remains = Exprs.sub(\n      scope,\n      pageExtent,\n      Exprs.add(\n        scope,\n        Exprs.add(scope, borderStartWidth, paddingStart),\n        Exprs.add(scope, borderEndWidth, paddingEnd),\n      ),\n    );\n\n    // The dimensions are calculated as for a non-replaced block element in\n    // normal flow (http://www.w3.org/TR/CSS21/visudet.html#blockwidth)\n    if (!extent) {\n      if (!marginStart) {\n        marginStart = scope.zero;\n      }\n      if (!marginEnd) {\n        marginEnd = scope.zero;\n      }\n      extent = Exprs.sub(\n        scope,\n        remains,\n        Exprs.add(scope, marginStart, marginEnd),\n      );\n    } else {\n      remains = Exprs.sub(scope, remains, extent);\n      if (!marginStart && !marginEnd) {\n        marginStart = Exprs.mul(scope, remains, new Exprs.Const(scope, 0.5));\n        marginEnd = marginStart;\n      } else if (marginStart) {\n        marginEnd = Exprs.sub(scope, remains, marginStart);\n      } else {\n        marginStart = Exprs.sub(scope, remains, marginEnd);\n      }\n    }\n\n    // TODO over-constrained case\n    // \"if the values are over-constrained, instead of ignoring any margins, the\n    // containing block is resized to coincide with the margin edges of the page\n    // box.\" (CSS Paged Media http://dev.w3.org/csswg/css-page/#page-model)\n    style[startSide] = new Css.Expr(marginStart);\n    style[endSide] = new Css.Expr(marginEnd);\n    style[`margin-${startSide}`] = Css.numericZero;\n    style[`margin-${endSide}`] = Css.numericZero;\n    style[`padding-${startSide}`] = new Css.Expr(paddingStart);\n    style[`padding-${endSide}`] = new Css.Expr(paddingEnd);\n    style[`border-${startSide}-width`] = new Css.Expr(borderStartWidth);\n    style[`border-${endSide}-width`] = new Css.Expr(borderEndWidth);\n    style[extentName] = new Css.Expr(extent);\n    style[`max-${extentName}`] = new Css.Expr(extent);\n    return {\n      borderBoxExtent: Exprs.sub(\n        scope,\n        pageExtent,\n        Exprs.add(scope, marginStart, marginEnd),\n      ),\n      marginStart,\n      marginEnd,\n    };\n  }\n\n  /**\n   * @override\n   */\n  prepareContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n    clientLayout: Vtree.ClientLayout,\n  ): void {\n    super.prepareContainer(context, container, page, docFaces, clientLayout);\n    page.pageAreaElement = container.element as HTMLElement;\n\n    // Set page area size for vw/vh unit calculation\n    context.pageAreaWidth = parseFloat(page.pageAreaElement.style.width);\n    context.pageAreaHeight = parseFloat(page.pageAreaElement.style.height);\n  }\n}\n\nexport class PageMarginBoxPartitionInstance extends PageMaster.PartitionInstance<\n  PageMarginBoxPartition\n> {\n  boxInfo: PageMarginBoxInformation;\n  suppressEmptyBoxGeneration: boolean = true;\n\n  constructor(\n    parentInstance: PageMaster.PageBoxInstance,\n    pageMarginBoxPartition: PageMarginBoxPartition,\n  ) {\n    super(parentInstance, pageMarginBoxPartition);\n    const name = pageMarginBoxPartition.marginBoxName;\n    this.boxInfo = pageMarginBoxes[name];\n    const pageRuleMasterInstance = parentInstance as PageRuleMasterInstance;\n    pageRuleMasterInstance.pageMarginBoxInstances[name] = this;\n  }\n\n  /**\n   * @override\n   */\n  prepareContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    docFaces: Font.DocumentFaces,\n    clientLayout: Vtree.ClientLayout,\n  ): void {\n    this.applyVerticalAlign(context, container.element);\n    super.prepareContainer(context, container, page, docFaces, clientLayout);\n  }\n\n  private applyVerticalAlign(context: Exprs.Context, element: Element) {\n    Base.setCSSProperty(element, \"display\", \"flex\");\n    const verticalAlign: Css.Val = this.getProp(context, \"vertical-align\");\n    let flexAlign: string | null = null;\n    if (verticalAlign === Css.getName(\"middle\")) {\n      flexAlign = \"center\";\n    } else if (verticalAlign === Css.getName(\"top\")) {\n      flexAlign = \"flex-start\";\n    } else if (verticalAlign === Css.getName(\"bottom\")) {\n      flexAlign = \"flex-end\";\n    }\n    if (flexAlign) {\n      Base.setCSSProperty(\n        element,\n        \"flex-flow\",\n        this.vertical ? \"row\" : \"column\",\n      );\n      Base.setCSSProperty(element, \"justify-content\", flexAlign);\n    }\n  }\n\n  /**\n   * Calculate page-margin boxes positions along the variable dimension of the\n   * page. For CENTER and END margin boxes, the position is calculated only if\n   * the dimension (width or height) is non-auto, so that it can be resolved at\n   * this point. If the dimension is auto, the calculation is deffered.\n   */\n  private positionAlongVariableDimension(\n    names: { start: string; end: string; extent: string },\n    dim: PageAreaDimension | null,\n  ): void {\n    const style = this.style;\n    const scope = this.pageBox.scope;\n    const startSide = names.start;\n    const endSide = names.end;\n    const extentName = names.extent;\n    const isHorizontal = startSide === \"left\";\n    const availableExtent = isHorizontal\n      ? dim.borderBoxWidth\n      : dim.borderBoxHeight;\n    const extent = PageMaster.toExprAuto(\n      scope,\n      style[extentName],\n      availableExtent,\n    );\n    const startOffset = isHorizontal ? dim.marginLeft : dim.marginTop;\n    if (\n      this.boxInfo.positionAlongVariableDimension ===\n      MarginBoxPositionAlongVariableDimension.START\n    ) {\n      style[startSide] = new Css.Expr(startOffset);\n    } else if (extent) {\n      const marginStart = PageMaster.toExprZero(\n        scope,\n        style[`margin-${startSide}`],\n        availableExtent,\n      );\n      const marginEnd = PageMaster.toExprZero(\n        scope,\n        style[`margin-${endSide}`],\n        availableExtent,\n      );\n      const paddingStart = PageMaster.toExprZero(\n        scope,\n        style[`padding-${startSide}`],\n        availableExtent,\n      );\n      const paddingEnd = PageMaster.toExprZero(\n        scope,\n        style[`padding-${endSide}`],\n        availableExtent,\n      );\n      const borderStartWidth = PageMaster.toExprZeroBorder(\n        scope,\n        style[`border-${startSide}-width`],\n        style[`border-${startSide}-style`],\n        availableExtent,\n      );\n      const borderEndWidth = PageMaster.toExprZeroBorder(\n        scope,\n        style[`border-${endSide}-width`],\n        style[`border-${endSide}-style`],\n        availableExtent,\n      );\n      const outerExtent = Exprs.add(\n        scope,\n        extent,\n        Exprs.add(\n          scope,\n          Exprs.add(scope, paddingStart, paddingEnd),\n          Exprs.add(\n            scope,\n            Exprs.add(scope, borderStartWidth, borderEndWidth),\n            Exprs.add(scope, marginStart, marginEnd),\n          ),\n        ),\n      );\n      switch (this.boxInfo.positionAlongVariableDimension) {\n        case MarginBoxPositionAlongVariableDimension.CENTER:\n          style[startSide] = new Css.Expr(\n            Exprs.add(\n              scope,\n              startOffset,\n              Exprs.div(\n                scope,\n                Exprs.sub(scope, availableExtent, outerExtent),\n                new Exprs.Const(scope, 2),\n              ),\n            ),\n          );\n          break;\n        case MarginBoxPositionAlongVariableDimension.END:\n          style[startSide] = new Css.Expr(\n            Exprs.sub(\n              scope,\n              Exprs.add(scope, startOffset, availableExtent),\n              outerExtent,\n            ),\n          );\n          break;\n      }\n    }\n  }\n\n  /**\n   * Calculate page-margin boxes positions along the fixed dimension of the\n   * page.\n   */\n  private positionAndSizeAlongFixedDimension(\n    names: { inside: string; outside: string; extent: string },\n    dim: PageAreaDimension | null,\n  ): void {\n    const style = this.style;\n    const scope = this.pageBox.scope;\n    const insideName = names.inside;\n    const outsideName = names.outside;\n    const extentName = names.extent;\n    const pageMargin =\n      dim[\n        `margin${outsideName.charAt(0).toUpperCase()}${outsideName.substring(\n          1,\n        )}`\n      ];\n    const marginInside = PageMaster.toExprZeroAuto(\n      scope,\n      style[`margin-${insideName}`],\n      pageMargin,\n    );\n    const marginOutside = PageMaster.toExprZeroAuto(\n      scope,\n      style[`margin-${outsideName}`],\n      pageMargin,\n    );\n    const paddingInside = PageMaster.toExprZero(\n      scope,\n      style[`padding-${insideName}`],\n      pageMargin,\n    );\n    const paddingOutside = PageMaster.toExprZero(\n      scope,\n      style[`padding-${outsideName}`],\n      pageMargin,\n    );\n    const borderInsideWidth = PageMaster.toExprZeroBorder(\n      scope,\n      style[`border-${insideName}-width`],\n      style[`border-${insideName}-style`],\n      pageMargin,\n    );\n    const borderOutsideWidth = PageMaster.toExprZeroBorder(\n      scope,\n      style[`border-${outsideName}-width`],\n      style[`border-${outsideName}-style`],\n      pageMargin,\n    );\n    const extent = PageMaster.toExprAuto(scope, style[extentName], pageMargin);\n    let result: {\n      extent: Exprs.Result;\n      marginInside: Exprs.Result;\n      marginOutside: Exprs.Result;\n    } = null;\n\n    function getComputedValues(\n      context: Exprs.Context,\n    ): {\n      extent: Exprs.Result | null;\n      marginInside: Exprs.Result | null;\n      marginOutside: Exprs.Result | null;\n    } {\n      if (result) {\n        return result;\n      }\n      result = {\n        extent: extent ? extent.evaluate(context) : null,\n        marginInside: marginInside ? marginInside.evaluate(context) : null,\n        marginOutside: marginOutside ? marginOutside.evaluate(context) : null,\n      };\n      const pageMarginValue = pageMargin.evaluate(context);\n      let borderAndPadding = 0;\n      [\n        borderInsideWidth,\n        paddingInside,\n        paddingOutside,\n        borderOutsideWidth,\n      ].forEach((x) => {\n        if (x) {\n          borderAndPadding += x.evaluate(context) as number;\n        }\n      });\n      if (result.marginInside === null || result.marginOutside === null) {\n        const total =\n          borderAndPadding +\n          (result.extent as number) +\n          (result.marginInside as number) +\n          (result.marginOutside as number);\n        if (total > pageMarginValue) {\n          if (result.marginInside === null) {\n            result.marginInside = 0;\n          }\n          if (result.marginOutside === null) {\n            result.marginOutside = 0;\n          }\n        }\n      }\n      if (\n        result.extent !== null &&\n        result.marginInside !== null &&\n        result.marginOutside !== null\n      ) {\n        // over-constrained\n        result.marginOutside = null;\n      }\n      if (\n        result.extent === null &&\n        result.marginInside !== null &&\n        result.marginOutside !== null\n      ) {\n        result.extent =\n          pageMarginValue -\n          borderAndPadding -\n          (result.marginInside as number) -\n          (result.marginOutside as number);\n      } else if (\n        result.extent !== null &&\n        (result.marginInside as number) === null &&\n        (result.marginOutside as number) !== null\n      ) {\n        result.marginInside =\n          pageMarginValue -\n          borderAndPadding -\n          (result.extent as number) -\n          (result.marginOutside as number);\n      } else if (\n        result.extent !== null &&\n        result.marginInside !== null &&\n        result.marginOutside === null\n      ) {\n        result.marginOutside =\n          pageMarginValue -\n          borderAndPadding -\n          (result.extent as number) -\n          (result.marginInside as number);\n      } else if (result.extent === null) {\n        result.marginInside = result.marginOutside = 0;\n        result.extent = pageMarginValue - borderAndPadding;\n      } else {\n        result.marginInside = result.marginOutside =\n          (pageMarginValue - borderAndPadding - (result.extent as number)) / 2;\n      }\n      return result;\n    }\n    style[extentName] = new Css.Expr(\n      new Exprs.Native(\n        scope,\n        function() {\n          const value = getComputedValues(this).extent;\n          return value === null ? 0 : value;\n        },\n        extentName,\n      ),\n    );\n    style[`margin-${insideName}`] = new Css.Expr(\n      new Exprs.Native(\n        scope,\n        function() {\n          const value = getComputedValues(this).marginInside;\n          return value === null ? 0 : value;\n        },\n        `margin-${insideName}`,\n      ),\n    );\n    style[`margin-${outsideName}`] = new Css.Expr(\n      new Exprs.Native(\n        scope,\n        function() {\n          const value = getComputedValues(this).marginOutside;\n          return value === null ? 0 : value;\n        },\n        `margin-${outsideName}`,\n      ),\n    );\n    if (insideName === \"left\") {\n      style[\"left\"] = new Css.Expr(\n        Exprs.add(scope, dim.marginLeft, dim.borderBoxWidth),\n      );\n    } else if (insideName === \"top\") {\n      style[\"top\"] = new Css.Expr(\n        Exprs.add(scope, dim.marginTop, dim.borderBoxHeight),\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  initHorizontal(): void {\n    const pageRuleMasterInstance = this\n      .parentInstance as PageRuleMasterInstance;\n    const dim = pageRuleMasterInstance.pageAreaDimension;\n    if (this.boxInfo.isInLeftColumn) {\n      this.positionAndSizeAlongFixedDimension(\n        { inside: \"right\", outside: \"left\", extent: \"width\" },\n        dim,\n      );\n    } else if (this.boxInfo.isInRightColumn) {\n      this.positionAndSizeAlongFixedDimension(\n        { inside: \"left\", outside: \"right\", extent: \"width\" },\n        dim,\n      );\n    } else {\n      this.positionAlongVariableDimension(\n        { start: \"left\", end: \"right\", extent: \"width\" },\n        dim,\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  initVertical(): void {\n    const pageRuleMasterInstance = this\n      .parentInstance as PageRuleMasterInstance;\n    const dim = pageRuleMasterInstance.pageAreaDimension;\n    if (this.boxInfo.isInTopRow) {\n      this.positionAndSizeAlongFixedDimension(\n        { inside: \"bottom\", outside: \"top\", extent: \"height\" },\n        dim,\n      );\n    } else if (this.boxInfo.isInBottomRow) {\n      this.positionAndSizeAlongFixedDimension(\n        { inside: \"top\", outside: \"bottom\", extent: \"height\" },\n        dim,\n      );\n    } else {\n      this.positionAlongVariableDimension(\n        { start: \"top\", end: \"bottom\", extent: \"height\" },\n        dim,\n      );\n    }\n  }\n\n  /**\n   * @override\n   */\n  finishContainer(\n    context: Exprs.Context,\n    container: Vtree.Container,\n    page: Vtree.Page,\n    column: Vtree.Container,\n    columnCount: number,\n    clientLayout: Vtree.ClientLayout,\n    docFaces: Font.DocumentFaces,\n  ): void {\n    super.finishContainer(\n      context,\n      container,\n      page,\n      column,\n      columnCount,\n      clientLayout,\n      docFaces,\n    );\n\n    // finishContainer is called only when the margin box is generated.\n    // In this case, store the generated container for the margin box in the\n    // page object. (except when it is a corner margin box, because size of a\n    // corner margin box does not need to be adjusted after the layout)\n    const marginBoxes = page.marginBoxes;\n    const name = (this.pageBox as any).marginBoxName;\n    const boxInfo = this.boxInfo;\n    if (!boxInfo.isInLeftColumn && !boxInfo.isInRightColumn) {\n      if (boxInfo.isInTopRow) {\n        marginBoxes.top[name] = container;\n      } else if (boxInfo.isInBottomRow) {\n        marginBoxes.bottom[name] = container;\n      }\n    } else if (!boxInfo.isInTopRow && !boxInfo.isInBottomRow) {\n      if (boxInfo.isInLeftColumn) {\n        marginBoxes.left[name] = container;\n      } else if (boxInfo.isInRightColumn) {\n        marginBoxes.right[name] = container;\n      }\n    }\n  }\n}\n\n/**\n * Dynamically generate and manage page masters corresponding to page at-rules.\n */\nexport class PageManager {\n  private pageMasterCache: any = {} as {\n    [key: string]: PageMaster.PageMasterInstance;\n  };\n\n  constructor(\n    private readonly cascadeInstance: CssCascade.CascadeInstance,\n    private readonly pageScope: Exprs.LexicalScope,\n    private readonly rootPageBoxInstance: PageMaster.RootPageBoxInstance,\n    private readonly context: Exprs.Context,\n    private readonly docElementStyle: CssCascade.ElementStyle,\n  ) {\n    this.definePageProgression();\n  }\n\n  /**\n   * Determine the page progression and define left/right/recto/verso pages.\n   */\n  private definePageProgression() {\n    // TODO If a page break is forced before the root element, recto/verso pages\n    // are no longer odd/even pages. left/right are reversed too.\n    const scope = this.pageScope;\n    const pageNumber = new Exprs.Named(scope, \"page-number\");\n    const isEvenPage = new Exprs.Eq(\n      scope,\n      new Exprs.Modulo(scope, pageNumber, new Exprs.Const(scope, 2)),\n      scope.zero,\n    );\n    scope.defineName(\"recto-page\", new Exprs.Not(scope, isEvenPage));\n    scope.defineName(\"verso-page\", isEvenPage);\n    const styleInstance: any /* Ops.StyleInstance */ = this.context;\n    const pageProgression =\n      styleInstance.pageProgression ||\n      resolvePageProgression(this.docElementStyle);\n    if (pageProgression === Constants.PageProgression.LTR) {\n      scope.defineName(\"left-page\", isEvenPage);\n      scope.defineName(\"right-page\", new Exprs.Not(scope, isEvenPage));\n    } else {\n      scope.defineName(\"left-page\", new Exprs.Not(scope, isEvenPage));\n      scope.defineName(\"right-page\", isEvenPage);\n    }\n  }\n\n  /**\n   * Get cascaded page style specified in page context for the current page.\n   */\n  getCascadedPageStyle(): CssCascade.ElementStyle {\n    const style = {} as CssCascade.ElementStyle;\n    this.cascadeInstance.pushRule([], \"\", style);\n    this.cascadeInstance.popRule();\n    return style;\n  }\n\n  /**\n   * Return a PageMasterInstance with page rules applied. Return a cached\n   * instance if there already exists one with the same styles.\n   * @param pageMasterInstance The original page master instance.\n   * @param cascadedPageStyle Cascaded page style specified in page context.\n   */\n  getPageRulePageMaster(\n    pageMasterInstance: PageMaster.PageMasterInstance,\n    cascadedPageStyle: CssCascade.ElementStyle,\n  ): PageMaster.PageMasterInstance {\n    const pageMaster = pageMasterInstance.pageBox as PageMaster.PageMaster;\n\n    // If no properies are specified in @page rules, use the original page\n    // master.\n    if (Object.keys(cascadedPageStyle).length === 0) {\n      pageMaster.resetScope();\n      return pageMasterInstance;\n    }\n    const key = this.makeCacheKey(cascadedPageStyle, pageMaster);\n    let applied = this.pageMasterCache[key];\n    if (!applied) {\n      if (pageMaster.pseudoName === PageMaster.userAgentPageMasterPseudo) {\n        // If the passed page master is a UA page master,\n        // ignore it and generate a new page master from @page rules.\n        applied = this.generatePageRuleMaster(cascadedPageStyle);\n      } else {\n        // Otherwise cascade some properties from @page rules to the page\n        // master.\n        applied = this.generateCascadedPageMaster(\n          cascadedPageStyle,\n          pageMaster,\n        );\n      }\n      this.pageMasterCache[key] = applied;\n    }\n    applied.pageBox.resetScope();\n    return applied;\n  }\n\n  /**\n   * Generate a cache key from the specified styles and the original page master\n   * key.\n   */\n  private makeCacheKey(\n    style: CssCascade.ElementStyle,\n    pageMaster: PageMaster.PageMaster,\n  ): string {\n    const propsStr = this.makeCascadeValueObjectKey(style);\n    return `${pageMaster.key}^${propsStr}`;\n  }\n\n  private makeCascadeValueObjectKey(object: CssCascade.ElementStyle): string {\n    const props = [] as string[];\n    for (const prop in object) {\n      if (Object.prototype.hasOwnProperty.call(object, prop)) {\n        const val = object[prop];\n        let str: string;\n        if (val instanceof CssCascade.CascadeValue) {\n          str = `${val.value}`;\n        } else {\n          str = this.makeCascadeValueObjectKey(val);\n        }\n        props.push(prop + str + (val.priority || \"\"));\n      }\n    }\n    return props.sort().join(\"^\");\n  }\n\n  private generatePageRuleMaster(\n    style: CssCascade.ElementStyle,\n  ): PageRuleMasterInstance {\n    const pageMaster = new PageRuleMaster(\n      this.pageScope,\n      this.rootPageBoxInstance.pageBox as PageMaster.RootPageBox,\n      style,\n    );\n    const pageMasterInstance = pageMaster.createInstance(\n      this.rootPageBoxInstance,\n    );\n\n    // Do the same initialization as in Ops.StyleInstance.prototype.init\n    pageMasterInstance.applyCascadeAndInit(\n      this.cascadeInstance,\n      this.docElementStyle,\n    );\n    pageMasterInstance.resolveAutoSizing(this.context);\n    return pageMasterInstance;\n  }\n\n  /**\n   * Cascade some properties from `@page` rules to a page master.\n   * For now, only 'width' and 'height' resolved from 'size' value are cascaded.\n   * @param style Cascaded style in the page context\n   * @param pageMaster The original page master\n   */\n  private generateCascadedPageMaster(\n    style: CssCascade.ElementStyle,\n    pageMaster: PageMaster.PageMaster,\n  ): PageMaster.PageMasterInstance {\n    const newPageMaster = pageMaster.clone({\n      pseudoName: pageRuleMasterPseudoName,\n    });\n    const pageMasterStyle = newPageMaster.specified;\n    const size = style[\"size\"];\n    if (size) {\n      const pageSize = resolvePageSizeAndBleed(style as any);\n      const priority = size.priority;\n      pageMasterStyle[\"width\"] = CssCascade.cascadeValues(\n        this.context,\n        pageMasterStyle[\"width\"],\n        new CssCascade.CascadeValue(pageSize.width, priority),\n      );\n      pageMasterStyle[\"height\"] = CssCascade.cascadeValues(\n        this.context,\n        pageMasterStyle[\"height\"],\n        new CssCascade.CascadeValue(pageSize.height, priority),\n      );\n    }\n\n    // Transfer counter properties to the page style so that these specified in\n    // the page master are also effective. Note that these values (if specified)\n    // always override values in page contexts.\n    [\"counter-reset\", \"counter-increment\"].forEach((name) => {\n      if (pageMasterStyle[name]) {\n        style[name] = pageMasterStyle[name];\n      }\n    });\n    const pageMasterInstance = newPageMaster.createInstance(\n      this.rootPageBoxInstance,\n    ) as PageMaster.PageMasterInstance;\n\n    // Do the same initialization as in Ops.StyleInstance.prototype.init\n    pageMasterInstance.applyCascadeAndInit(\n      this.cascadeInstance,\n      this.docElementStyle,\n    );\n    pageMasterInstance.resolveAutoSizing(this.context);\n    return pageMasterInstance;\n  }\n}\n\nexport class CheckPageTypeAction extends CssCascade.ChainedAction {\n  constructor(public readonly pageType: string) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    if (cascadeInstance.currentPageType === this.pageType) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 3;\n  }\n\n  /**\n   * @override\n   */\n  makePrimary(cascade: CssCascade.Cascade): boolean {\n    if (this.chained) {\n      cascade.insertInTable(cascade.pagetypes, this.pageType, this.chained);\n    }\n    return true;\n  }\n}\n\nexport class IsFirstPageAction extends CssCascade.ChainedAction {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    const pageNumber = new Exprs.Named(this.scope, \"page-number\");\n    if (pageNumber.evaluate(cascadeInstance.context) === 1) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 2;\n  }\n}\n\nexport class IsLeftPageAction extends CssCascade.ChainedAction {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    const leftPage = new Exprs.Named(this.scope, \"left-page\");\n    if (leftPage.evaluate(cascadeInstance.context)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 1;\n  }\n}\n\nexport class IsRightPageAction extends CssCascade.ChainedAction {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    const rightPage = new Exprs.Named(this.scope, \"right-page\");\n    if (rightPage.evaluate(cascadeInstance.context)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 1;\n  }\n}\n\nexport class IsRectoPageAction extends CssCascade.ChainedAction {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    const rectoPage = new Exprs.Named(this.scope, \"recto-page\");\n    if (rectoPage.evaluate(cascadeInstance.context)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 1;\n  }\n}\n\nexport class IsVersoPageAction extends CssCascade.ChainedAction {\n  constructor(public readonly scope: Exprs.LexicalScope) {\n    super();\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    const versoPage = new Exprs.Named(this.scope, \"verso-page\");\n    if (versoPage.evaluate(cascadeInstance.context)) {\n      this.chained.apply(cascadeInstance);\n    }\n  }\n\n  /**\n   * @override\n   */\n  getPriority(): number {\n    return 1;\n  }\n}\n\n/**\n * Action applying an at-page rule\n */\nexport class ApplyPageRuleAction extends CssCascade.ApplyRuleAction {\n  constructor(style: CssCascade.ElementStyle, specificity: number) {\n    super(style, specificity, null, null, null);\n  }\n\n  /**\n   * @override\n   */\n  apply(cascadeInstance: CssCascade.CascadeInstance): void {\n    mergeInPageRule(\n      cascadeInstance.context,\n      cascadeInstance.currentStyle,\n      this.style,\n      this.specificity,\n      cascadeInstance,\n    );\n  }\n}\n\n/**\n * Merge page styles, including styles specified on page-margin boxes,\n * considering specificity. Intended to be used in place of\n * CssCascade.mergeIn, which is for element styles.\n */\nexport function mergeInPageRule(\n  context: Exprs.Context,\n  target: CssCascade.ElementStyle,\n  style: CssCascade.ElementStyle,\n  specificity: number,\n  cascadeInstance: CssCascade.CascadeInstance,\n): void {\n  CssCascade.mergeIn(context, target, style, specificity, null, null, null);\n  const marginBoxes = style[marginBoxesKey];\n  if (marginBoxes) {\n    const targetMap = CssCascade.getMutableStyleMap(target, marginBoxesKey);\n    for (const boxName in marginBoxes) {\n      if (marginBoxes.hasOwnProperty(boxName)) {\n        let targetBox = targetMap[boxName];\n        if (!targetBox) {\n          targetBox = {} as CssCascade.ElementStyle;\n          targetMap[boxName] = targetBox;\n        }\n        CssCascade.mergeIn(\n          context,\n          targetBox,\n          marginBoxes[boxName],\n          specificity,\n          null,\n          null,\n          null,\n        );\n      }\n    }\n  }\n}\n\n/**\n * ParserHandler for `@page` rules. It handles properties specified with page\n * contexts. It also does basic cascading (which can be done without information\n * other than the page rules themselves) and stores the result in `pageProps`\n * object as a map from page selectors to sets of properties. This result is\n * later used for adding `@page` rules to the real DOM, which are then used by\n * the PDF renderer (Chromium) to determine page sizes.\n */\nexport class PageParserHandler extends CssCascade.CascadeParserHandler\n  implements CssValidator.PropertyReceiver {\n  private currentPageSelectors: {\n    selectors: string[] | null;\n    specificity: number;\n  }[] = [];\n  private currentNamedPageSelector: string = \"\";\n  private currentPseudoPageClassSelectors: string[] = [];\n\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    parent: CssCascade.CascadeParserHandler,\n    validatorSet: CssValidator.ValidatorSet,\n    private readonly pageProps: { [key: string]: CssCascade.ElementStyle },\n  ) {\n    super(scope, owner, null, parent, null, validatorSet, false);\n  }\n\n  /**\n   * @override\n   */\n  startPageRule(): void {\n    this.startSelectorRule();\n  }\n\n  /**\n   * @override\n   */\n  tagSelector(ns: string | null, name: string | null): void {\n    Asserts.assert(name);\n    this.currentNamedPageSelector = name;\n    if (name) {\n      this.chain.push(new CheckPageTypeAction(name));\n      this.specificity += 65536;\n    }\n  }\n\n  /**\n   * @override\n   */\n  pseudoclassSelector(name: string, params: (number | string)[]): void {\n    if (params) {\n      this.reportAndSkip(\n        `E_INVALID_PAGE_SELECTOR :${name}(${params.join(\"\")})`,\n      );\n    }\n    this.currentPseudoPageClassSelectors.push(`:${name}`);\n    switch (name.toLowerCase()) {\n      case \"first\":\n        this.chain.push(new IsFirstPageAction(this.scope));\n        this.specificity += 256;\n        break;\n      case \"left\":\n        this.chain.push(new IsLeftPageAction(this.scope));\n        this.specificity += 1;\n        break;\n      case \"right\":\n        this.chain.push(new IsRightPageAction(this.scope));\n        this.specificity += 1;\n        break;\n      case \"recto\":\n        this.chain.push(new IsRectoPageAction(this.scope));\n        this.specificity += 1;\n        break;\n      case \"verso\":\n        this.chain.push(new IsVersoPageAction(this.scope));\n        this.specificity += 1;\n        break;\n      default:\n        this.reportAndSkip(`E_INVALID_PAGE_SELECTOR :${name}`);\n        break;\n    }\n  }\n\n  /**\n   * Save currently processed selector and reset variables.\n   */\n  private finishSelector() {\n    let selectors: string[];\n    if (\n      !this.currentNamedPageSelector &&\n      !this.currentPseudoPageClassSelectors.length\n    ) {\n      selectors = null;\n    } else {\n      selectors = [this.currentNamedPageSelector].concat(\n        this.currentPseudoPageClassSelectors.sort(),\n      );\n    }\n    this.currentPageSelectors.push({\n      selectors,\n      specificity: this.specificity,\n    });\n    this.currentNamedPageSelector = \"\";\n    this.currentPseudoPageClassSelectors = [];\n  }\n\n  /**\n   * @override\n   */\n  nextSelector(): void {\n    this.finishSelector();\n    super.nextSelector();\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    this.finishSelector();\n    super.startRuleBody();\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    // we limit 'bleed' and 'marks' to be effective only when specified without\n    // page selectors\n    if (\n      (name === \"bleed\" || name === \"marks\") &&\n      !this.currentPageSelectors.some((s) => s.selectors === null)\n    ) {\n      return;\n    }\n    super.simpleProperty(name, value, important);\n    const cascVal = CssCascade.getProp(this.elementStyle, name);\n    const pageProps = this.pageProps;\n    if (name === \"bleed\" || name === \"marks\") {\n      if (!pageProps[\"\"]) {\n        pageProps[\"\"] = {} as CssCascade.ElementStyle;\n      }\n\n      // we can simply overwrite without considering specificity\n      // since 'bleed' and 'marks' always come from a page rule without page\n      // selectors.\n      Object.keys(pageProps).forEach((selector) => {\n        CssCascade.setProp(pageProps[selector], name, cascVal);\n      });\n    } else if (name === \"size\") {\n      const noPageSelectorProps = pageProps[\"\"];\n      this.currentPageSelectors.forEach((s) => {\n        // update specificity to reflect the specificity of the selector\n        let result = new CssCascade.CascadeValue(\n          cascVal.value,\n          cascVal.priority + s.specificity,\n        );\n        const selector = s.selectors ? s.selectors.join(\"\") : \"\";\n        let props = pageProps[selector];\n        if (!props) {\n          // since no properties for this selector have been stored before,\n          // we can simply set the 'size', 'bleed' and 'marks' properties.\n          props = pageProps[selector] = {} as CssCascade.ElementStyle;\n          CssCascade.setProp(props, name, result);\n          if (noPageSelectorProps) {\n            [\"bleed\", \"marks\"].forEach((n) => {\n              if (noPageSelectorProps[n]) {\n                CssCascade.setProp(props, n, noPageSelectorProps[n]);\n              }\n            }, this);\n          }\n        } else {\n          // consider specificity when setting 'size' property.\n          // we don't have to set 'bleed' and 'marks' since they should have\n          // been already updated.\n          const prevCascVal = CssCascade.getProp(props, name);\n          result = prevCascVal\n            ? CssCascade.cascadeValues(null, result, prevCascVal)\n            : result;\n          CssCascade.setProp(props, name, result);\n        }\n      });\n    }\n  }\n\n  /**\n   * @override\n   */\n  insertNonPrimary(action: CssCascade.CascadeAction): void {\n    // We represent page rules without selectors by *, though it is illegal in\n    // CSS\n    this.cascade.insertInTable(this.cascade.pagetypes, \"*\", action);\n  }\n\n  /**\n   * @override\n   */\n  makeApplyRuleAction(specificity: number): CssCascade.ApplyRuleAction {\n    return new ApplyPageRuleAction(this.elementStyle, specificity);\n  }\n\n  /**\n   * @override\n   */\n  startPageMarginBoxRule(name: string): void {\n    const marginBoxMap = CssCascade.getMutableStyleMap(\n      this.elementStyle,\n      marginBoxesKey,\n    );\n    let boxStyle = marginBoxMap[name];\n    if (!boxStyle) {\n      boxStyle = {} as CssCascade.ElementStyle;\n      marginBoxMap[name] = boxStyle;\n    }\n    const handler = new PageMarginBoxParserHandler(\n      this.scope,\n      this.owner,\n      this.validatorSet,\n      boxStyle,\n    );\n    this.owner.pushHandler(handler);\n  }\n}\n\n/**\n * Parser handler for a page-margin box rule.\n */\nexport class PageMarginBoxParserHandler extends CssParser.SlaveParserHandler\n  implements CssValidator.PropertyReceiver {\n  constructor(\n    scope: Exprs.LexicalScope,\n    owner: CssParser.DispatchParserHandler,\n    public readonly validatorSet: CssValidator.ValidatorSet,\n    public readonly boxStyle: CssCascade.ElementStyle,\n  ) {\n    super(scope, owner, false);\n  }\n\n  /**\n   * @override\n   */\n  property(name: string, value: Css.Val, important: boolean): void {\n    this.validatorSet.validatePropertyAndHandleShorthand(\n      name,\n      value,\n      important,\n      this,\n    );\n  }\n\n  /**\n   * @override\n   */\n  invalidPropertyValue(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY_VALUE ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  unknownProperty(name: string, value: Css.Val): void {\n    this.report(`E_INVALID_PROPERTY ${name}: ${value.toString()}`);\n  }\n\n  /**\n   * @override\n   */\n  simpleProperty(name: string, value: Css.Val, important): void {\n    const specificity = important\n      ? this.getImportantSpecificity()\n      : this.getBaseSpecificity();\n    const cascval = new CssCascade.CascadeValue(value, specificity);\n    CssCascade.setProp(this.boxStyle, name, cascval);\n  }\n}\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Urls - URL Utilities\n */\n\n/**\n * transform all urls in attributeValue using documentURLTransformer.\n *\n * @returns transformed attributeValue\n */\n\nexport const transformURIs = (\n  attributeValue,\n  baseUrl,\n  documentURLTransformer,\n) =>\n  attributeValue\n    .replace(\n      /[uU][rR][lL]\\(\\s*\"((\\\\([^0-9a-fA-F]+|[0-9a-fA-F]+\\s*)|[^\"\\r\\n])+)\"/gm,\n      (match, m1) =>\n        `url(\"${documentURLTransformer.transformURL(m1, baseUrl)}\"`,\n    )\n    .replace(\n      /[uU][rR][lL]\\(\\s*'((\\\\([^0-9a-fA-F]+|[0-9a-fA-F]+\\s*)|[^'\\r\\n])+)'/gm,\n      (match, m1) =>\n        `url('${documentURLTransformer.transformURL(m1, baseUrl)}'`,\n    )\n    .replace(\n      /[uU][rR][lL]\\(\\s*((\\\\([^0-9a-fA-F]+|[0-9a-fA-F]+\\s*)|[^\"'\\r\\n\\)\\s])+)/gm,\n      (match, m1) => `url(${documentURLTransformer.transformURL(m1, baseUrl)}`,\n    );\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Vgen - View tree generator.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssStyler from \"./css-styler\";\nimport * as Diff from \"./diff\";\nimport * as Display from \"./display\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as Matchers from \"./matchers\";\nimport * as PageFloats from \"./page-floats\";\nimport * as Plugin from \"./plugin\";\nimport * as PseudoElement from \"./pseudo-element\";\nimport * as RepetitiveElement from \"./repetitive-element\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\nimport * as Urls from \"./urls\";\nimport * as Vtree from \"./vtree\";\nimport * as Layout from \"./layout\";\nimport { XmlDoc } from \"./types\";\n\nconst namespacePrefixMap = {};\n\nexport const frontEdgeBlackListHor: { [key: string]: string } = {\n  \"text-indent\": \"0px\",\n  \"margin-top\": \"0px\",\n  \"padding-top\": \"0px\",\n  \"border-top-width\": \"0px\",\n  \"border-top-style\": \"none\",\n  \"border-top-color\": \"transparent\",\n  \"border-top-left-radius\": \"0px\",\n  \"border-top-right-radius\": \"0px\",\n};\n\nexport const frontEdgeBlackListVert: { [key: string]: string } = {\n  \"text-indent\": \"0px\",\n  \"margin-right\": \"0px\",\n  \"padding-right\": \"0px\",\n  \"border-right-width\": \"0px\",\n  \"border-right-style\": \"none\",\n  \"border-right-color\": \"transparent\",\n  \"border-top-right-radius\": \"0px\",\n  \"border-bottom-right-radius\": \"0px\",\n};\n\nexport const frontEdgeUnforcedBreakBlackListHor: { [key: string]: string } = {\n  \"margin-top\": \"0px\",\n};\n\nexport const frontEdgeUnforcedBreakBlackListVert: { [key: string]: string } = {\n  \"margin-right\": \"0px\",\n};\n\nexport type CustomRenderer = (\n  p1: Element,\n  p2: Element,\n  p3: { [key: string]: Css.Val },\n) => Task.Result<Element>;\n\nexport interface CustomRendererFactory {\n  makeCustomRenderer(xmldoc: XmlDoc.XMLDocHolder): CustomRenderer;\n}\n\n/**\n * Creates an epubReadingSystem object in the iframe.contentWindow.navigator\n * when load event fires.\n */\nexport function initIFrame(iframe: HTMLIFrameElement): void {\n  iframe.addEventListener(\n    \"load\",\n    () => {\n      iframe.contentWindow.navigator[\"epubReadingSystem\"] = {\n        name: \"adapt\",\n        version: \"0.1\",\n        layoutStyle: \"paginated\",\n        hasFeature: function(name, version) {\n          switch (name) {\n            case \"mouse-events\":\n              return true;\n          }\n          return false;\n        },\n      };\n    },\n    false,\n  );\n}\n\nexport interface StylerProducer {\n  getStylerForDoc(xmldoc: XmlDoc.XMLDocHolder): CssStyler.AbstractStyler;\n}\n\nexport class ViewFactory extends Base.SimpleEventTarget\n  implements Vtree.LayoutContext {\n  private static SVG_URL_ATTRIBUTES: string[] = [\n    \"color-profile\",\n    \"clip-path\",\n    \"cursor\",\n    \"filter\",\n    \"marker\",\n    \"marker-start\",\n    \"marker-end\",\n    \"marker-mid\",\n    \"fill\",\n    \"stroke\",\n    \"mask\",\n  ];\n  document: Document;\n  exprContentListener: Vtree.ExprContentListener;\n\n  // provided by layout\n  nodeContext: Vtree.NodeContext | null = null;\n  viewRoot: Element | null = null;\n  isFootnote: boolean = false;\n  sourceNode: Node | null = null;\n  offsetInNode: number = 0;\n\n  // computed\n  // TODO: only set it on NodeContext\n  viewNode: Node | null = null;\n\n  constructor(\n    public readonly flowName: string,\n    public readonly context: Exprs.Context,\n    public readonly viewport: Viewport,\n    public readonly styler: CssStyler.Styler,\n    public readonly regionIds: string[],\n    public readonly xmldoc: XmlDoc.XMLDocHolder,\n    public readonly docFaces: Font.DocumentFaces,\n    public readonly footnoteStyle: CssCascade.ElementStyle,\n    public readonly stylerProducer: StylerProducer,\n    public readonly page: Vtree.Page,\n    public readonly customRenderer: CustomRenderer,\n    public readonly fallbackMap: { [key: string]: string },\n    public readonly documentURLTransformer: Base.DocumentURLTransformer,\n  ) {\n    super();\n    this.document = viewport.document;\n    this.exprContentListener = styler.counterListener.getExprContentListener();\n  }\n\n  /**\n   * @override\n   */\n  clone(): Vtree.LayoutContext {\n    return new ViewFactory(\n      this.flowName,\n      this.context,\n      this.viewport,\n      this.styler,\n      this.regionIds,\n      this.xmldoc,\n      this.docFaces,\n      this.footnoteStyle,\n      this.stylerProducer,\n      this.page,\n      this.customRenderer,\n      this.fallbackMap,\n      this.documentURLTransformer,\n    );\n  }\n\n  createPseudoelementShadow(\n    element: Element,\n    isRoot: boolean,\n    cascStyle: CssCascade.ElementStyle,\n    computedStyle: { [key: string]: Css.Val },\n    styler: CssStyler.AbstractStyler,\n    context: Exprs.Context,\n    parentShadow: Vtree.ShadowContext,\n    subShadow: Vtree.ShadowContext,\n  ): Vtree.ShadowContext {\n    const pseudoMap = this.getPseudoMap(\n      cascStyle,\n      this.regionIds,\n      this.isFootnote,\n      this.nodeContext,\n      context,\n    );\n    if (!pseudoMap) {\n      return subShadow;\n    }\n    const addedNames = [];\n    const root = PseudoElement.document.createElementNS(Base.NS.SHADOW, \"root\");\n    let att = root;\n    for (const name of PseudoElement.pseudoNames) {\n      let elem: Element;\n      if (name) {\n        if (!pseudoMap[name]) {\n          continue;\n        }\n        if (name == \"footnote-marker\" && !(isRoot && this.isFootnote)) {\n          continue;\n        }\n        if (name.match(/^first-/)) {\n          const display = computedStyle[\"display\"];\n          if (!display || display === Css.ident.inline) {\n            continue;\n          }\n        }\n        if (name === \"before\" || name === \"after\") {\n          const content = pseudoMap[name][\"content\"];\n          if (\n            !content ||\n            content === Css.ident.normal ||\n            content === Css.ident.none\n          ) {\n            continue;\n          }\n        }\n        addedNames.push(name);\n        elem = PseudoElement.document.createElementNS(Base.NS.XHTML, \"span\");\n        PseudoElement.setPseudoName(elem, name);\n      } else {\n        elem = PseudoElement.document.createElementNS(\n          Base.NS.SHADOW,\n          \"content\",\n        );\n      }\n      att.appendChild(elem);\n      if (name.match(/^first-/)) {\n        att = elem;\n      }\n    }\n    if (!addedNames.length) {\n      return subShadow;\n    }\n    const shadowStyler = new PseudoElement.PseudoelementStyler(\n      element,\n      cascStyle,\n      styler,\n      context,\n      this.exprContentListener,\n    );\n    return new Vtree.ShadowContext(\n      element,\n      root,\n      null,\n      parentShadow,\n      subShadow,\n      Vtree.ShadowType.ROOTLESS,\n      shadowStyler,\n    );\n  }\n\n  getPseudoMap(\n    cascStyle: CssCascade.ElementStyle,\n    regionIds: string[],\n    isFootnote: boolean,\n    nodeContext: Vtree.NodeContext,\n    context: Exprs.Context,\n  ) {\n    const pseudoMap = CssCascade.getStyleMap(cascStyle, \"_pseudos\");\n    if (!pseudoMap) {\n      return null;\n    }\n    const computedPseudoStyleMap = {};\n    for (const key in pseudoMap) {\n      const computedPseudoStyle = (computedPseudoStyleMap[key] = {});\n      CssCascade.mergeStyle(computedPseudoStyle, pseudoMap[key], context);\n      CssCascade.mergeViewConditionalStyles(\n        computedPseudoStyle,\n        context,\n        pseudoMap[key],\n      );\n      CssCascade.forEachStylesInRegion(\n        pseudoMap[key],\n        regionIds,\n        isFootnote,\n        (regionId, regionStyle) => {\n          CssCascade.mergeStyle(computedPseudoStyle, regionStyle, context);\n          CssCascade.forEachViewConditionalStyles(\n            regionStyle,\n            (viewConditionalStyles) => {\n              CssCascade.mergeStyle(\n                computedPseudoStyle,\n                viewConditionalStyles,\n                context,\n              );\n            },\n          );\n        },\n      );\n    }\n    return computedPseudoStyleMap;\n  }\n\n  createRefShadow(\n    href: string,\n    type: Vtree.ShadowType,\n    element: Element,\n    parentShadow: Vtree.ShadowContext,\n    subShadow: Vtree.ShadowContext,\n  ): Task.Result<Vtree.ShadowContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.ShadowContext> = Task.newFrame(\n      \"createRefShadow\",\n    );\n    self.xmldoc.store.load(href).then((refDocParam) => {\n      const refDoc = refDocParam;\n      if (refDoc) {\n        const refElement = refDoc.getElement(href);\n        if (refElement) {\n          const refStyler = self.stylerProducer.getStylerForDoc(refDoc);\n          subShadow = new Vtree.ShadowContext(\n            element,\n            refElement,\n            refDoc,\n            parentShadow,\n            subShadow,\n            type,\n            refStyler,\n          );\n        }\n      }\n      frame.finish(subShadow);\n    });\n    return frame.result();\n  }\n\n  createShadows(\n    element: Element,\n    isRoot,\n    cascStyle: CssCascade.ElementStyle,\n    computedStyle: { [key: string]: Css.Val },\n    styler: CssStyler.AbstractStyler,\n    context: Exprs.Context,\n    shadowContext: Vtree.ShadowContext,\n  ): Task.Result<Vtree.ShadowContext> {\n    const self = this;\n    const frame: Task.Frame<Vtree.ShadowContext> = Task.newFrame(\n      \"createShadows\",\n    );\n    const shadow: Vtree.ShadowContext = null;\n    const templateURLVal = computedStyle[\"template\"];\n    let cont: Task.Result<Vtree.ShadowContext>;\n    if (templateURLVal instanceof Css.URL) {\n      const url = (templateURLVal as Css.URL).url;\n      cont = self.createRefShadow(\n        url,\n        Vtree.ShadowType.ROOTLESS,\n        element,\n        shadowContext,\n        shadow,\n      );\n    } else {\n      cont = Task.newResult(shadow);\n    }\n    cont.then((shadow) => {\n      let cont1: Task.Result<Vtree.ShadowContext> = null;\n      if (element.namespaceURI == Base.NS.SHADOW) {\n        if (element.localName == \"include\") {\n          let href = element.getAttribute(\"href\");\n          let xmldoc: XmlDoc.XMLDocHolder = null;\n          if (href) {\n            xmldoc = shadowContext ? shadowContext.xmldoc : self.xmldoc;\n          } else if (shadowContext) {\n            if (shadowContext.owner.namespaceURI == Base.NS.XHTML) {\n              href = shadowContext.owner.getAttribute(\"href\");\n            } else {\n              href = shadowContext.owner.getAttributeNS(Base.NS.XLINK, \"href\");\n            }\n            xmldoc = shadowContext.parentShadow\n              ? shadowContext.parentShadow.xmldoc\n              : self.xmldoc;\n          }\n          if (href) {\n            href = Base.resolveURL(href, xmldoc.url);\n            cont1 = self.createRefShadow(\n              href,\n              Vtree.ShadowType.ROOTED,\n              element,\n              shadowContext,\n              shadow,\n            );\n          }\n        }\n      }\n      if (cont1 == null) {\n        cont1 = Task.newResult(shadow);\n      }\n      let cont2: Task.Result<Vtree.ShadowContext> = null;\n      cont1.then((shadow) => {\n        if (computedStyle[\"display\"] === Css.ident.table_cell) {\n          const url = Base.resolveURL(\n            \"user-agent.xml#table-cell\",\n            Base.resourceBaseURL,\n          );\n          cont2 = self.createRefShadow(\n            url,\n            Vtree.ShadowType.ROOTLESS,\n            element,\n            shadowContext,\n            shadow,\n          );\n        } else {\n          cont2 = Task.newResult(shadow);\n        }\n      });\n      cont2.then((shadow) => {\n        shadow = self.createPseudoelementShadow(\n          element,\n          isRoot,\n          cascStyle,\n          computedStyle,\n          styler,\n          context,\n          shadowContext,\n          shadow,\n        );\n        frame.finish(shadow);\n      });\n    });\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  setViewRoot(viewRoot: Element, isFootnote: boolean) {\n    this.viewRoot = viewRoot;\n    this.isFootnote = isFootnote;\n  }\n\n  /**\n   * @return vertical\n   */\n  computeStyle(\n    vertical: boolean,\n    rtl: boolean,\n    style: CssCascade.ElementStyle,\n    computedStyle: { [key: string]: Css.Val },\n  ): boolean {\n    const context = this.context;\n    const cascMap = CssCascade.flattenCascadedStyle(\n      style,\n      context,\n      this.regionIds,\n      this.isFootnote,\n      this.nodeContext,\n    );\n    vertical = CssCascade.isVertical(cascMap, context, vertical);\n    rtl = CssCascade.isRtl(cascMap, context, rtl);\n    const self = this;\n    CssCascade.convertToPhysical(\n      cascMap,\n      computedStyle,\n      vertical,\n      rtl,\n      (name, cascVal) => {\n        let value = cascVal.evaluate(context, name);\n        if (name == \"font-family\") {\n          value = self.docFaces.filterFontFamily(value);\n        }\n        return value;\n      },\n    );\n\n    // Compute values of display, position and float\n    const position = computedStyle[\"position\"] as Css.Ident;\n    const float = computedStyle[\"float\"] as Css.Ident;\n    const displayValues = Display.getComputedDislayValue(\n      (computedStyle[\"display\"] as Css.Ident) || Css.ident.inline,\n      position,\n      float,\n      this.sourceNode === this.xmldoc.root,\n    );\n    [\"display\", \"position\", \"float\"].forEach((name) => {\n      if (displayValues[name]) {\n        computedStyle[name] = displayValues[name];\n      }\n    });\n    return vertical;\n  }\n\n  private inheritFromSourceParent(\n    elementStyle: CssCascade.ElementStyle,\n  ): { lang: string | null; elementStyle: CssCascade.ElementStyle } {\n    let node = this.nodeContext.sourceNode;\n    const styles = [];\n    let lang: string | null = null;\n\n    // TODO: this is hacky. We need to recover the path through the shadow\n    // trees, but we do not have the full shadow tree structure at this point.\n    // This code handles coming out of the shadow trees, but does not go back in\n    // (through shadow:content element).\n    let shadowContext = this.nodeContext.shadowContext;\n    let steps = -1;\n    while (node && node.nodeType == 1) {\n      const shadowRoot = shadowContext && shadowContext.root == node;\n      if (!shadowRoot || shadowContext.type == Vtree.ShadowType.ROOTLESS) {\n        const styler = shadowContext\n          ? (shadowContext.styler as CssStyler.AbstractStyler)\n          : this.styler;\n        const nodeStyle = styler.getStyle(node as Element, false);\n        styles.push(nodeStyle);\n        lang = lang || Base.getLangAttribute(node as Element);\n      }\n      if (shadowRoot) {\n        node = shadowContext.owner;\n        shadowContext = shadowContext.parentShadow;\n      } else {\n        node = node.parentNode;\n        steps++;\n      }\n    }\n    const isRoot = steps === 0;\n    const fontSize = this.context.queryUnitSize(\"em\", isRoot);\n    const props = {\n      \"font-size\": new CssCascade.CascadeValue(\n        new Css.Numeric(fontSize, \"px\"),\n        0,\n      ),\n    } as CssCascade.ElementStyle;\n    const inheritanceVisitor = new CssCascade.InheritanceVisitor(\n      props,\n      this.context,\n    );\n    for (let i = styles.length - 1; i >= 0; --i) {\n      const style = styles[i];\n      const propList = [];\n      for (const propName in style) {\n        if (CssCascade.isInherited(propName)) {\n          propList.push(propName);\n        }\n      }\n      propList.sort(Css.processingOrderFn);\n      for (const name of propList) {\n        inheritanceVisitor.setPropName(name);\n        const value = CssCascade.getProp(style, name);\n        if (value.value !== Css.ident.inherit) {\n          props[name] = value.filterValue(inheritanceVisitor);\n        }\n      }\n    }\n    for (const sname in elementStyle) {\n      if (!CssCascade.isInherited(sname)) {\n        props[sname] = elementStyle[sname];\n      }\n    }\n    return { lang, elementStyle: props };\n  }\n\n  resolveURL(url: string): string {\n    url = Base.resolveURL(url, this.xmldoc.url);\n    return this.fallbackMap[url] || url;\n  }\n\n  inheritLangAttribute() {\n    this.nodeContext.lang =\n      Base.getLangAttribute(this.nodeContext.sourceNode as Element) ||\n      (this.nodeContext.parent && this.nodeContext.parent.lang) ||\n      this.nodeContext.lang;\n  }\n\n  transferPolyfilledInheritedProps(computedStyle: { [key: string]: Css.Val }) {\n    const polyfilledInheritedProps = CssCascade.getPolyfilledInheritedProps().filter(\n      (name) => computedStyle[name],\n    );\n    if (polyfilledInheritedProps.length) {\n      let props = this.nodeContext.inheritedProps;\n      if (this.nodeContext.parent) {\n        props = this.nodeContext.inheritedProps = {};\n        for (const n in this.nodeContext.parent.inheritedProps) {\n          props[n] = this.nodeContext.parent.inheritedProps[n];\n        }\n      }\n      polyfilledInheritedProps.forEach((name) => {\n        const value = computedStyle[name];\n        if (value) {\n          if (value instanceof Css.Int) {\n            props[name] = (value as Css.Int).num;\n          } else if (value instanceof Css.Ident) {\n            props[name] = (value as Css.Ident).name;\n          } else if (value instanceof Css.Numeric) {\n            const numericVal = value as Css.Numeric;\n            switch (numericVal.unit) {\n              case \"dpi\":\n              case \"dpcm\":\n              case \"dppx\":\n                props[name] =\n                  numericVal.num * Exprs.defaultUnitSizes[numericVal.unit];\n                break;\n            }\n          } else {\n            props[name] = value;\n          }\n          delete computedStyle[name];\n        }\n      });\n    }\n  }\n\n  resolveFormattingContext(\n    nodeContext: Vtree.NodeContext,\n    firstTime: boolean,\n    display: Css.Ident,\n    position: Css.Ident,\n    float: Css.Ident,\n    isRoot: boolean,\n  ) {\n    const hooks: Plugin.ResolveFormattingContextHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.RESOLVE_FORMATTING_CONTEXT,\n    );\n    for (let i = 0; i < hooks.length; i++) {\n      const formattingContext = hooks[i](\n        nodeContext,\n        firstTime,\n        display,\n        position,\n        float,\n        isRoot,\n      );\n      if (formattingContext) {\n        nodeContext.formattingContext = formattingContext;\n        return;\n      }\n    }\n  }\n\n  /**\n   * @return holding true if children should be processed\n   */\n  private createElementView(\n    firstTime: boolean,\n    atUnforcedBreak: boolean,\n  ): Task.Result<boolean> {\n    const self = this;\n    let needToProcessChildren = true;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"createElementView\");\n\n    // Figure out element's styles\n    let element = self.sourceNode as Element;\n    const styler = self.nodeContext.shadowContext\n      ? (self.nodeContext.shadowContext.styler as CssStyler.AbstractStyler)\n      : self.styler;\n    let elementStyle = styler.getStyle(element, false);\n    if (!self.nodeContext.shadowContext) {\n      const offset = this.xmldoc.getElementOffset(element);\n      Matchers.NthFragmentMatcher.registerFragmentIndex(\n        offset,\n        self.nodeContext.fragmentIndex,\n        0,\n      );\n    }\n    const computedStyle = {};\n    if (!self.nodeContext.parent) {\n      const inheritedValues = self.inheritFromSourceParent(elementStyle);\n      elementStyle = inheritedValues.elementStyle;\n      self.nodeContext.lang = inheritedValues.lang;\n    }\n    const floatReference =\n      elementStyle[\"float-reference\"] &&\n      PageFloats.floatReferenceOf(\n        elementStyle[\"float-reference\"].value.toString(),\n      );\n    if (\n      self.nodeContext.parent &&\n      floatReference &&\n      PageFloats.isPageFloat(floatReference)\n    ) {\n      // Since a page float will be detached from a view node of its parent,\n      // inherited properties need to be inherited from its source parent.\n      const inheritedValues = self.inheritFromSourceParent(elementStyle);\n      elementStyle = inheritedValues.elementStyle;\n      self.nodeContext.lang = inheritedValues.lang;\n    }\n    self.nodeContext.vertical = self.computeStyle(\n      self.nodeContext.vertical,\n      self.nodeContext.direction === \"rtl\",\n      elementStyle,\n      computedStyle,\n    );\n    styler.processContent(element, computedStyle);\n    this.transferPolyfilledInheritedProps(computedStyle);\n    this.inheritLangAttribute();\n    if (computedStyle[\"direction\"]) {\n      self.nodeContext.direction = computedStyle[\"direction\"].toString();\n    }\n\n    // Sort out the properties\n    const flow = computedStyle[\"flow-into\"];\n    if (flow && flow.toString() != self.flowName) {\n      // foreign flow, don't create a view\n      frame.finish(false);\n      return frame.result();\n    }\n    let display = computedStyle[\"display\"];\n    if (display === Css.ident.none) {\n      // no content\n      frame.finish(false);\n      return frame.result();\n    }\n    const isRoot = self.nodeContext.parent == null;\n    self.nodeContext.flexContainer = display === Css.ident.flex;\n    self\n      .createShadows(\n        element,\n        isRoot,\n        elementStyle,\n        computedStyle,\n        styler,\n        self.context,\n        self.nodeContext.shadowContext,\n      )\n      .then((shadowParam) => {\n        self.nodeContext.nodeShadow = shadowParam;\n        const position = computedStyle[\"position\"];\n        let floatSide = computedStyle[\"float\"];\n        let clearSide = computedStyle[\"clear\"];\n        const writingMode = self.nodeContext.vertical\n          ? Css.ident.vertical_rl\n          : Css.ident.horizontal_tb;\n        const parentWritingMode = self.nodeContext.parent\n          ? self.nodeContext.parent.vertical\n            ? Css.ident.vertical_rl\n            : Css.ident.horizontal_tb\n          : writingMode;\n        const isFlowRoot = Display.isFlowRoot(element);\n        self.nodeContext.establishesBFC = Display.establishesBFC(\n          display,\n          position,\n          floatSide,\n          computedStyle[\"overflow\"],\n          writingMode,\n          parentWritingMode,\n          isFlowRoot,\n        );\n        self.nodeContext.containingBlockForAbsolute = Display.establishesCBForAbsolute(\n          position,\n        );\n        if (\n          self.nodeContext.isInsideBFC() &&\n          floatSide !== Css.ident.footnote &&\n          !(floatReference && PageFloats.isPageFloat(floatReference))\n        ) {\n          // When the element is already inside a block formatting context\n          // (except one from the root), float and clear can be controlled by\n          // the browser and we don't need to care.\n          floatSide = null;\n          clearSide = null;\n        }\n        let floating =\n          floatSide === Css.ident.left ||\n          floatSide === Css.ident.right ||\n          floatSide === Css.ident.top ||\n          floatSide === Css.ident.bottom ||\n          floatSide === Css.ident.inline_start ||\n          floatSide === Css.ident.inline_end ||\n          floatSide === Css.ident.block_start ||\n          floatSide === Css.ident.block_end ||\n          floatSide === Css.ident.snap_block ||\n          floatSide === Css.ident.footnote;\n        if (floatSide) {\n          // Don't want to set it in view DOM CSS.\n          delete computedStyle[\"float\"];\n          if (floatSide === Css.ident.footnote) {\n            if (self.isFootnote) {\n              // No footnotes inside footnotes. self is most likely the root\n              // of the footnote body being rendered in footnote area. Treat\n              // as block.\n              floating = false;\n              computedStyle[\"display\"] = Css.ident.block;\n            } else {\n              computedStyle[\"display\"] = Css.ident.inline;\n            }\n          }\n        }\n        if (clearSide) {\n          if (clearSide === Css.ident.inherit) {\n            if (self.nodeContext.parent && self.nodeContext.parent.clearSide) {\n              clearSide = Css.getName(self.nodeContext.parent.clearSide);\n            }\n          }\n          if (\n            clearSide === Css.ident.left ||\n            clearSide === Css.ident.right ||\n            clearSide === Css.ident.top ||\n            clearSide === Css.ident.bottom ||\n            clearSide === Css.ident.both ||\n            clearSide === Css.ident.all ||\n            clearSide === Css.ident.same\n          ) {\n            delete computedStyle[\"clear\"];\n            if (\n              computedStyle[\"display\"] &&\n              computedStyle[\"display\"] != Css.ident.inline\n            ) {\n              self.nodeContext.clearSide = clearSide.toString();\n            }\n          }\n        }\n        const listItem =\n          display === Css.ident.list_item &&\n          computedStyle[\"ua-list-item-count\"];\n        if (\n          floating ||\n          (computedStyle[\"break-inside\"] &&\n            computedStyle[\"break-inside\"] !== Css.ident.auto)\n        ) {\n          self.nodeContext.breakPenalty++;\n        }\n        if (\n          display &&\n          display !== Css.ident.inline &&\n          Display.isInlineLevel(display)\n        ) {\n          // Don't break inside ruby, inline-block, etc.\n          self.nodeContext.breakPenalty++;\n        }\n        self.nodeContext.inline =\n          (!floating && !display) ||\n          Display.isInlineLevel(display) ||\n          Display.isRubyInternalDisplay(display);\n        self.nodeContext.display = display ? display.toString() : \"inline\";\n        self.nodeContext.floatSide = floating ? floatSide.toString() : null;\n        self.nodeContext.floatReference =\n          floatReference || PageFloats.FloatReference.INLINE;\n        self.nodeContext.floatMinWrapBlock =\n          computedStyle[\"float-min-wrap-block\"] || null;\n        self.nodeContext.columnSpan = computedStyle[\"column-span\"];\n        if (!self.nodeContext.inline) {\n          const breakAfter = computedStyle[\"break-after\"];\n          if (breakAfter) {\n            self.nodeContext.breakAfter = breakAfter.toString();\n          }\n          const breakBefore = computedStyle[\"break-before\"];\n          if (breakBefore) {\n            self.nodeContext.breakBefore = breakBefore.toString();\n          }\n        }\n        self.nodeContext.verticalAlign =\n          (computedStyle[\"vertical-align\"] &&\n            computedStyle[\"vertical-align\"].toString()) ||\n          \"baseline\";\n        self.nodeContext.captionSide =\n          (computedStyle[\"caption-side\"] &&\n            computedStyle[\"caption-side\"].toString()) ||\n          \"top\";\n        const borderCollapse = computedStyle[\"border-collapse\"];\n        if (!borderCollapse || borderCollapse === Css.getName(\"separate\")) {\n          const borderSpacing = computedStyle[\"border-spacing\"];\n          let inlineBorderSpacing;\n          let blockBorderSpacing;\n          if (borderSpacing) {\n            if (borderSpacing.isSpaceList()) {\n              inlineBorderSpacing = borderSpacing.values[0];\n              blockBorderSpacing = borderSpacing.values[1];\n            } else {\n              inlineBorderSpacing = blockBorderSpacing = borderSpacing;\n            }\n            if (inlineBorderSpacing.isNumeric()) {\n              self.nodeContext.inlineBorderSpacing = Css.toNumber(\n                inlineBorderSpacing,\n                self.context,\n              );\n            }\n            if (blockBorderSpacing.isNumeric()) {\n              self.nodeContext.blockBorderSpacing = Css.toNumber(\n                blockBorderSpacing,\n                self.context,\n              );\n            }\n          }\n        }\n        self.nodeContext.footnotePolicy = computedStyle[\"footnote-policy\"];\n        const firstPseudo = computedStyle[\"x-first-pseudo\"];\n        if (firstPseudo) {\n          const outerPseudo = self.nodeContext.parent\n            ? self.nodeContext.parent.firstPseudo\n            : null;\n          self.nodeContext.firstPseudo = new Vtree.FirstPseudo(\n            outerPseudo,\n            /** Css.Int */\n            firstPseudo.num,\n          );\n        }\n        if (!self.nodeContext.inline) {\n          self.processAfterIfcontinues(\n            element,\n            elementStyle,\n            styler,\n            self.context,\n          );\n        }\n        const whitespace = computedStyle[\"white-space\"];\n        if (whitespace) {\n          const whitespaceValue = Vtree.whitespaceFromPropertyValue(\n            whitespace.toString(),\n          );\n          if (whitespaceValue !== null) {\n            self.nodeContext.whitespace = whitespaceValue;\n          }\n        }\n        const hyphenateCharacter = computedStyle[\"hyphenate-character\"];\n        if (hyphenateCharacter && hyphenateCharacter !== Css.ident.auto) {\n          self.nodeContext.hyphenateCharacter = hyphenateCharacter.str;\n        }\n        const wordBreak = computedStyle[\"word-break\"];\n        const overflowWrap = computedStyle[\"overflow-wrap\"] || [\"word-wrap\"];\n        self.nodeContext.breakWord =\n          wordBreak === Css.ident.break_all ||\n          overflowWrap === Css.ident.break_word;\n\n        // Resolve formatting context\n        self.resolveFormattingContext(\n          self.nodeContext,\n          firstTime,\n          display,\n          position,\n          floatSide,\n          isRoot,\n        );\n        if (\n          self.nodeContext.parent &&\n          self.nodeContext.parent.formattingContext\n        ) {\n          firstTime = self.nodeContext.parent.formattingContext.isFirstTime(\n            self.nodeContext,\n            firstTime,\n          );\n        }\n        if (!self.nodeContext.inline) {\n          self.nodeContext.repeatOnBreak = self.processRepeatOnBreak(\n            computedStyle,\n          );\n          self.findAndProcessRepeatingElements(element, styler);\n        }\n\n        // Create the view element\n        let custom = false;\n        let inner: Element = null;\n        const fetchers = [];\n        let ns = element.namespaceURI;\n        let tag = element.localName;\n        if (ns == Base.NS.XHTML) {\n          if (\n            tag == \"html\" ||\n            tag == \"body\" ||\n            tag == \"script\" ||\n            tag == \"link\" ||\n            tag == \"meta\"\n          ) {\n            tag = \"div\";\n          } else if (tag == \"vide_\") {\n            tag = \"video\";\n          } else if (tag == \"audi_\") {\n            tag = \"audio\";\n          } else if (tag == \"object\") {\n            custom = !!self.customRenderer;\n          }\n          if (element.getAttribute(PseudoElement.PSEUDO_ATTR)) {\n            if (\n              elementStyle[\"content\"] &&\n              elementStyle[\"content\"].value &&\n              elementStyle[\"content\"].value.url\n            ) {\n              tag = \"img\";\n            }\n          }\n        } else if (ns == Base.NS.epub) {\n          tag = \"span\";\n          ns = Base.NS.XHTML;\n        } else if (ns == Base.NS.FB2) {\n          ns = Base.NS.XHTML;\n          if (tag == \"image\") {\n            tag = \"div\";\n            const imageRef = element.getAttributeNS(Base.NS.XLINK, \"href\");\n            if (imageRef && imageRef.charAt(0) == \"#\") {\n              const imageBinary = self.xmldoc.getElement(imageRef);\n              if (imageBinary) {\n                inner = self.createElement(ns, \"img\");\n                const mediaType =\n                  imageBinary.getAttribute(\"content-type\") || \"image/jpeg\";\n                const innerSrc = `data:${mediaType};base64,${imageBinary.textContent.replace(\n                  /[ \\t\\n\\t]/g,\n                  \"\",\n                )}`;\n                fetchers.push(TaskUtil.loadElement(inner, innerSrc));\n              }\n            }\n          } else {\n            tag = fb2Remap[tag];\n          }\n          if (!tag) {\n            tag = self.nodeContext.inline ? \"span\" : \"div\";\n          }\n        } else if (ns == Base.NS.NCX) {\n          ns = Base.NS.XHTML;\n          if (tag == \"ncx\" || tag == \"navPoint\") {\n            tag = \"div\";\n          } else if (tag == \"navLabel\") {\n            // Cheat here. Translate source to HTML, so it will plug\n            // in into the rest of the pipeline.\n            tag = \"span\";\n            const navParent = element.parentNode;\n            if (navParent) {\n              // find the content element\n              let href: string | null = null;\n              for (let c: Node = navParent.firstChild; c; c = c.nextSibling) {\n                if (c.nodeType != 1) {\n                  continue;\n                }\n                const childElement = c as Element;\n                if (\n                  childElement.namespaceURI == Base.NS.NCX &&\n                  childElement.localName == \"content\"\n                ) {\n                  href = childElement.getAttribute(\"src\");\n                  break;\n                }\n              }\n              if (href) {\n                tag = \"a\";\n                element = element.ownerDocument.createElementNS(ns, \"a\");\n                element.setAttribute(\"href\", href);\n              }\n            }\n          } else {\n            tag = \"span\";\n          }\n        } else if (ns == Base.NS.SHADOW) {\n          ns = Base.NS.XHTML;\n          tag = self.nodeContext.inline ? \"span\" : \"div\";\n        } else {\n          custom = !!self.customRenderer;\n        }\n        if (listItem) {\n          if (firstTime) {\n            tag = \"li\";\n          } else {\n            tag = \"div\";\n            display = Css.ident.block;\n            computedStyle[\"display\"] = display;\n          }\n        } else if (tag == \"body\" || tag == \"li\") {\n          tag = \"div\";\n        } else if (tag == \"q\") {\n          tag = \"span\";\n        } else if (tag == \"a\") {\n          const hp = computedStyle[\"hyperlink-processing\"];\n          if (hp && hp.toString() != \"normal\") {\n            tag = \"span\";\n          }\n        }\n        if (computedStyle[\"behavior\"]) {\n          const behavior = computedStyle[\"behavior\"].toString();\n          if (behavior != \"none\" && self.customRenderer) {\n            custom = true;\n          }\n        }\n        if (\n          (element as HTMLElement).dataset &&\n          element.getAttribute(\"data-math-typeset\") === \"true\"\n        ) {\n          custom = true;\n        }\n        let elemResult: Task.Result<Element>;\n        if (custom) {\n          const parentNode = self.nodeContext.parent\n            ? self.nodeContext.parent.viewNode\n            : null;\n          elemResult = self.customRenderer(\n            element,\n            parentNode as Element,\n            computedStyle,\n          );\n        } else {\n          elemResult = Task.newResult(null);\n        }\n        elemResult.then((result) => {\n          if (result) {\n            if (custom) {\n              needToProcessChildren =\n                result.getAttribute(\"data-adapt-process-children\") == \"true\";\n            }\n          } else {\n            result = self.createElement(ns, tag);\n          }\n          if (tag == \"a\") {\n            result.addEventListener(\"click\", self.page.hrefHandler, false);\n          }\n          if (inner) {\n            self.applyPseudoelementStyle(self.nodeContext, \"inner\", inner);\n            result.appendChild(inner);\n          }\n          if (\n            result.localName == \"iframe\" &&\n            result.namespaceURI == Base.NS.XHTML\n          ) {\n            initIFrame(result as HTMLIFrameElement);\n          }\n          const imageResolution = self.nodeContext.inheritedProps[\n            \"image-resolution\"\n          ] as number | undefined;\n          const images: {\n            image: HTMLElement;\n            element: HTMLElement;\n            fetcher: TaskUtil.Fetcher<string>;\n          }[] = [];\n          const cssWidth = computedStyle[\"width\"];\n          const cssHeight = computedStyle[\"height\"];\n          const attrWidth = element.getAttribute(\"width\");\n          const attrHeight = element.getAttribute(\"height\");\n          const hasAutoWidth =\n            cssWidth === Css.ident.auto || (!cssWidth && !attrWidth);\n          const hasAutoHeight =\n            cssHeight === Css.ident.auto || (!cssHeight && !attrHeight);\n          if (element.namespaceURI != Base.NS.FB2 || tag == \"td\") {\n            const attributes = element.attributes;\n            const attributeCount = attributes.length;\n            let delayedSrc: string | null = null;\n            for (let i = 0; i < attributeCount; i++) {\n              const attribute = attributes[i];\n              const attributeNS = attribute.namespaceURI;\n              let attributeName = attribute.localName;\n              let attributeValue = attribute.nodeValue;\n              if (!attributeNS) {\n                if (attributeName.match(/^on/)) {\n                  continue; // don't propagate JavaScript code\n                }\n                if (attributeName == \"style\") {\n                  continue; // we do styling ourselves\n                }\n                if (attributeName == \"id\" || attributeName == \"name\") {\n                  // Propagate transformed ids and collect them on the page\n                  // (only first time).\n                  if (firstTime) {\n                    attributeValue = self.documentURLTransformer.transformFragment(\n                      attributeValue,\n                      self.xmldoc.url,\n                    );\n                    result.setAttribute(attributeName, attributeValue);\n                    self.page.registerElementWithId(result, attributeValue);\n                    continue;\n                  }\n                }\n\n                // TODO: understand the element we are working with.\n                if (\n                  attributeName == \"src\" ||\n                  attributeName == \"href\" ||\n                  attributeName == \"poster\"\n                ) {\n                  attributeValue = self.resolveURL(attributeValue);\n                  if (attributeName === \"href\") {\n                    attributeValue = self.documentURLTransformer.transformURL(\n                      attributeValue,\n                      self.xmldoc.url,\n                    );\n                  }\n                } else if (attributeName == \"srcset\") {\n                  attributeValue = attributeValue\n                    .split(\",\")\n                    .map((value) => self.resolveURL(value.trim()))\n                    .join(\",\");\n                }\n                if (\n                  attributeName === \"poster\" &&\n                  tag === \"video\" &&\n                  ns === Base.NS.XHTML &&\n                  hasAutoWidth &&\n                  hasAutoHeight\n                ) {\n                  const image = new Image();\n                  const fetcher = TaskUtil.loadElement(image, attributeValue);\n                  fetchers.push(fetcher);\n                  images.push({\n                    image,\n                    element: result as HTMLElement,\n                    fetcher,\n                  });\n                }\n              } else if (attributeNS == \"http://www.w3.org/2000/xmlns/\") {\n                continue; // namespace declaration (in Firefox)\n              } else if (attributeNS == Base.NS.XLINK) {\n                if (attributeName == \"href\") {\n                  attributeValue = self.resolveURL(attributeValue);\n                }\n              }\n              if (ns == Base.NS.SVG && /^[A-Z\\-]+$/.test(attributeName)) {\n                // Workaround for Edge bug\n                // See\n                // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/5579311/\n                attributeName = attributeName.toLowerCase();\n              }\n              if (self.isSVGUrlAttribute(attributeName)) {\n                attributeValue = Urls.transformURIs(\n                  attributeValue,\n                  self.xmldoc.url,\n                  self.documentURLTransformer,\n                );\n              }\n              if (attributeNS) {\n                const attributePrefix = namespacePrefixMap[attributeNS];\n                if (attributePrefix) {\n                  attributeName = `${attributePrefix}:${attributeName}`;\n                }\n              }\n              if (\n                attributeName == \"src\" &&\n                !attributeNS &&\n                (tag == \"img\" || tag == \"input\") &&\n                ns == Base.NS.XHTML\n              ) {\n                // HTML img element should start loading only once all\n                // attributes are assigned.\n                delayedSrc = attributeValue;\n              } else if (\n                attributeName == \"href\" &&\n                tag == \"image\" &&\n                ns == Base.NS.SVG &&\n                attributeNS == Base.NS.XLINK\n              ) {\n                self.page.fetchers.push(\n                  TaskUtil.loadElement(result, attributeValue),\n                );\n              } else {\n                // When the document is not XML document (e.g. non-XML HTML)\n                // attributeNS can be null\n                if (attributeNS) {\n                  result.setAttributeNS(\n                    attributeNS,\n                    attributeName,\n                    attributeValue,\n                  );\n                } else {\n                  result.setAttribute(attributeName, attributeValue);\n                }\n              }\n            }\n            if (delayedSrc) {\n              const image = tag === \"input\" ? new Image() : result;\n              const imageFetcher = TaskUtil.loadElement(image, delayedSrc);\n              if (image !== result) {\n                (result as HTMLImageElement).src = delayedSrc;\n              }\n              if (!hasAutoWidth && !hasAutoHeight) {\n                // No need to wait for the image, does not affect layout\n                self.page.fetchers.push(imageFetcher);\n              } else {\n                if (\n                  hasAutoWidth &&\n                  hasAutoHeight &&\n                  imageResolution &&\n                  imageResolution !== 1\n                ) {\n                  images.push({\n                    image: image as HTMLElement,\n                    element: result as HTMLElement,\n                    fetcher: imageFetcher,\n                  });\n                }\n                fetchers.push(imageFetcher);\n              }\n            }\n          }\n          delete computedStyle[\"content\"];\n          const listStyleImage = computedStyle[\"list-style-image\"];\n          if (listStyleImage && listStyleImage instanceof Css.URL) {\n            const listStyleURL = (listStyleImage as Css.URL).url;\n            fetchers.push(TaskUtil.loadElement(new Image(), listStyleURL));\n          }\n          self.preprocessElementStyle(computedStyle);\n          self.applyComputedStyles(result, computedStyle);\n          if (!self.nodeContext.inline) {\n            let blackList: { [key: string]: string } = null;\n            if (!firstTime) {\n              if (\n                self.nodeContext.inheritedProps[\"box-decoration-break\"] !==\n                \"clone\"\n              ) {\n                blackList = self.nodeContext.vertical\n                  ? frontEdgeBlackListVert\n                  : frontEdgeBlackListHor;\n              } else {\n                // When box-decoration-break: clone, cloned margins are always\n                // truncated to zero.\n                blackList = self.nodeContext.vertical\n                  ? frontEdgeUnforcedBreakBlackListVert\n                  : frontEdgeUnforcedBreakBlackListHor;\n              }\n            } else if (atUnforcedBreak) {\n              blackList = self.nodeContext.vertical\n                ? frontEdgeUnforcedBreakBlackListVert\n                : frontEdgeUnforcedBreakBlackListHor;\n            }\n            if (blackList) {\n              for (const propName in blackList) {\n                Base.setCSSProperty(result, propName, blackList[propName]);\n              }\n            }\n          }\n          if (listItem) {\n            result.setAttribute(\n              \"value\",\n              computedStyle[\"ua-list-item-count\"].stringValue(),\n            );\n          }\n          self.viewNode = result;\n          if (fetchers.length) {\n            TaskUtil.waitForFetchers(fetchers).then(() => {\n              if (imageResolution > 0) {\n                self.modifyElemDimensionWithImageResolution(\n                  images,\n                  imageResolution,\n                  computedStyle,\n                  self.nodeContext.vertical,\n                );\n              }\n              frame.finish(needToProcessChildren);\n            });\n          } else {\n            frame.timeSlice().then(() => {\n              frame.finish(needToProcessChildren);\n            });\n          }\n        });\n      });\n    return frame.result();\n  }\n\n  private processAfterIfcontinues(\n    element: Element,\n    cascStyle: CssCascade.ElementStyle,\n    styler: CssStyler.AbstractStyler,\n    context: Exprs.Context,\n  ) {\n    const pseudoMap = this.getPseudoMap(\n      cascStyle,\n      this.regionIds,\n      this.isFootnote,\n      this.nodeContext,\n      context,\n    );\n    if (!pseudoMap) {\n      return;\n    }\n    if (\n      pseudoMap[\"after-if-continues\"] &&\n      pseudoMap[\"after-if-continues\"][\"content\"]\n    ) {\n      const shadowStyler = new PseudoElement.PseudoelementStyler(\n        element,\n        cascStyle,\n        styler,\n        context,\n        this.exprContentListener,\n      );\n      this.nodeContext.afterIfContinues = new Layout.AfterIfContinues(\n        element,\n        shadowStyler,\n      );\n    }\n  }\n\n  /**\n   * @return isSVGUrlAttribute\n   */\n  isSVGUrlAttribute(attributeName: string): boolean {\n    return ViewFactory.SVG_URL_ATTRIBUTES.includes(attributeName.toLowerCase());\n  }\n\n  modifyElemDimensionWithImageResolution(\n    images: {\n      image: HTMLElement;\n      element: HTMLElement;\n      fetcher: TaskUtil.Fetcher<string>;\n    }[],\n    imageResolution: number,\n    computedStyle: { [key: string]: Css.Val },\n    isVertical: boolean,\n  ) {\n    const self = this;\n    images.forEach((param) => {\n      if (param.fetcher.get().get() === \"load\") {\n        const img = param.image;\n        let scaledWidth = (img as HTMLImageElement).width / imageResolution;\n        let scaledHeight = (img as HTMLImageElement).height / imageResolution;\n        const elem = param.element;\n        if (scaledWidth > 0 && scaledHeight > 0) {\n          if (computedStyle[\"box-sizing\"] === Css.ident.border_box) {\n            if (computedStyle[\"border-left-style\"] !== Css.ident.none) {\n              scaledWidth += Css.toNumber(\n                computedStyle[\"border-left-width\"],\n                self.context,\n              );\n            }\n            if (computedStyle[\"border-right-style\"] !== Css.ident.none) {\n              scaledWidth += Css.toNumber(\n                computedStyle[\"border-right-width\"],\n                self.context,\n              );\n            }\n            if (computedStyle[\"border-top-style\"] !== Css.ident.none) {\n              scaledHeight += Css.toNumber(\n                computedStyle[\"border-top-width\"],\n                self.context,\n              );\n            }\n            if (computedStyle[\"border-bottom-style\"] !== Css.ident.none) {\n              scaledHeight += Css.toNumber(\n                computedStyle[\"border-bottom-width\"],\n                self.context,\n              );\n            }\n          }\n          if (imageResolution > 1) {\n            const maxWidth = computedStyle[\"max-width\"] || Css.ident.none;\n            const maxHeight = computedStyle[\"max-height\"] || Css.ident.none;\n            if (maxWidth === Css.ident.none && maxHeight === Css.ident.none) {\n              Base.setCSSProperty(elem, \"max-width\", `${scaledWidth}px`);\n            } else if (\n              maxWidth !== Css.ident.none &&\n              maxHeight === Css.ident.none\n            ) {\n              Base.setCSSProperty(elem, \"width\", `${scaledWidth}px`);\n            } else if (\n              maxWidth === Css.ident.none &&\n              maxHeight !== Css.ident.none\n            ) {\n              Base.setCSSProperty(elem, \"height\", `${scaledHeight}px`);\n            } else {\n              // maxWidth != none && maxHeight != none\n              Asserts.assert(maxWidth.isNumeric());\n              Asserts.assert(maxHeight.isNumeric());\n              const numericMaxWidth = maxWidth as Css.Numeric;\n              const numericMaxHeight = maxHeight as Css.Numeric;\n              if (numericMaxWidth.unit !== \"%\") {\n                Base.setCSSProperty(\n                  elem,\n                  \"max-width\",\n                  `${Math.min(\n                    scaledWidth,\n                    Css.toNumber(numericMaxWidth, self.context),\n                  )}px`,\n                );\n              } else if (numericMaxHeight.unit !== \"%\") {\n                Base.setCSSProperty(\n                  elem,\n                  \"max-height\",\n                  `${Math.min(\n                    scaledHeight,\n                    Css.toNumber(numericMaxHeight, self.context),\n                  )}px`,\n                );\n              } else {\n                if (isVertical) {\n                  Base.setCSSProperty(elem, \"height\", `${scaledHeight}px`);\n                } else {\n                  Base.setCSSProperty(elem, \"width\", `${scaledWidth}px`);\n                }\n              }\n            }\n          } else if (imageResolution < 1) {\n            const minWidth = computedStyle[\"min-width\"] || Css.numericZero;\n            const minHeight = computedStyle[\"min-height\"] || Css.numericZero;\n            Asserts.assert(minWidth.isNumeric());\n            Asserts.assert(minWidth.isNumeric());\n            const numericMinWidth = minWidth as Css.Numeric;\n            const numericMinHeight = minHeight as Css.Numeric;\n            if (numericMinWidth.num === 0 && numericMinHeight.num === 0) {\n              Base.setCSSProperty(elem, \"min-width\", `${scaledWidth}px`);\n            } else if (\n              numericMinWidth.num !== 0 &&\n              numericMinHeight.num === 0\n            ) {\n              Base.setCSSProperty(elem, \"width\", `${scaledWidth}px`);\n            } else if (\n              numericMinWidth.num === 0 &&\n              numericMinHeight.num !== 0\n            ) {\n              Base.setCSSProperty(elem, \"height\", `${scaledHeight}px`);\n            } else {\n              // minWidth != 0 && minHeight != 0\n              if (numericMinWidth.unit !== \"%\") {\n                Base.setCSSProperty(\n                  elem,\n                  \"min-width\",\n                  `${Math.max(\n                    scaledWidth,\n                    Css.toNumber(numericMinWidth, self.context),\n                  )}px`,\n                );\n              } else if (numericMinHeight.unit !== \"%\") {\n                Base.setCSSProperty(\n                  elem,\n                  \"min-height\",\n                  `${Math.max(\n                    scaledHeight,\n                    Css.toNumber(numericMinHeight, self.context),\n                  )}px`,\n                );\n              } else {\n                if (isVertical) {\n                  Base.setCSSProperty(elem, \"height\", `${scaledHeight}px`);\n                } else {\n                  Base.setCSSProperty(elem, \"width\", `${scaledWidth}px`);\n                }\n              }\n            }\n          }\n        }\n      }\n    });\n  }\n\n  private preprocessElementStyle(computedStyle: { [key: string]: Css.Val }) {\n    const self = this;\n    const hooks: Plugin.PreProcessElementStyleHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.PREPROCESS_ELEMENT_STYLE,\n    );\n    hooks.forEach((hook) => {\n      hook(self.nodeContext, computedStyle);\n    });\n  }\n\n  private findAndProcessRepeatingElements(\n    element: Element,\n    styler: CssStyler.AbstractStyler,\n  ) {\n    for (\n      let child: Node = element.firstChild;\n      child;\n      child = child.nextSibling\n    ) {\n      if (child.nodeType !== 1) {\n        continue;\n      }\n      const computedStyle = {};\n      const elementStyle = styler.getStyle(child as Element, false);\n      this.computeStyle(\n        this.nodeContext.vertical,\n        this.nodeContext.direction === \"rtl\",\n        elementStyle,\n        computedStyle,\n      );\n      const processRepeatOnBreak = this.processRepeatOnBreak(computedStyle);\n      if (!processRepeatOnBreak) {\n        continue;\n      }\n      if (\n        this.nodeContext.formattingContext instanceof\n          RepetitiveElement.RepetitiveElementsOwnerFormattingContext &&\n        !this.nodeContext.belongsTo(this.nodeContext.formattingContext)\n      ) {\n        return;\n      }\n      const parent = this.nodeContext.parent;\n      const parentFormattingContext = parent && parent.formattingContext;\n      this.nodeContext.formattingContext = new RepetitiveElement.RepetitiveElementsOwnerFormattingContext(\n        parentFormattingContext,\n        this.nodeContext.sourceNode as Element,\n      );\n      (this.nodeContext\n        .formattingContext as RepetitiveElement.RepetitiveElementsOwnerFormattingContext).initializeRepetitiveElements(\n        this.nodeContext.vertical,\n      );\n      return;\n    }\n  }\n\n  private processRepeatOnBreak(computedStyle: { [key: string]: Css.Val }) {\n    let repeatOnBreak = computedStyle[\"repeat-on-break\"];\n    if (repeatOnBreak !== Css.ident.none) {\n      if (repeatOnBreak === Css.ident.auto) {\n        if (computedStyle[\"display\"] === Css.ident.table_header_group) {\n          repeatOnBreak = Css.ident.header;\n        } else if (computedStyle[\"display\"] === Css.ident.table_footer_group) {\n          repeatOnBreak = Css.ident.footer;\n        } else {\n          repeatOnBreak = Css.ident.none;\n        }\n      }\n      if (repeatOnBreak && repeatOnBreak !== Css.ident.none) {\n        return repeatOnBreak.toString();\n      }\n    }\n    return null;\n  }\n\n  private createTextNodeView(): Task.Result<boolean> {\n    const self = this;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"createTextNodeView\");\n    this.preprocessTextContent().then(() => {\n      const offsetInNode = self.offsetInNode || 0;\n      const textContent = Diff.restoreNewText(\n        self.nodeContext.preprocessedTextContent,\n      ).substr(offsetInNode);\n      self.viewNode = document.createTextNode(textContent);\n      frame.finish(true);\n    });\n    return frame.result();\n  }\n\n  private preprocessTextContent(): Task.Result<boolean> {\n    if (this.nodeContext.preprocessedTextContent != null) {\n      return Task.newResult(true);\n    }\n    const self = this;\n    let originl: string;\n    let textContent = (originl = self.sourceNode.textContent);\n    const frame: Task.Frame<boolean> = Task.newFrame(\"preprocessTextContent\");\n    const hooks: Plugin.PreProcessTextContentHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.PREPROCESS_TEXT_CONTENT,\n    );\n    let index = 0;\n    frame\n      .loop(() => {\n        if (index >= hooks.length) {\n          return Task.newResult(false);\n        }\n        return hooks[index++](self.nodeContext, textContent).thenAsync(\n          (processedText) => {\n            textContent = processedText;\n            return Task.newResult(true);\n          },\n        );\n      })\n      .then(() => {\n        self.nodeContext.preprocessedTextContent = Diff.diffChars(\n          originl,\n          textContent,\n        );\n        frame.finish(true);\n      });\n    return frame.result();\n  }\n\n  /**\n   * @return holding true if children should be processed\n   */\n  createNodeView(\n    firstTime: boolean,\n    atUnforcedBreak: boolean,\n  ): Task.Result<boolean> {\n    const self = this;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"createNodeView\");\n    let result: Task.Result<boolean>;\n    let needToProcessChildren = true;\n    if (self.sourceNode.nodeType == 1) {\n      result = self.createElementView(firstTime, atUnforcedBreak);\n    } else {\n      if (self.sourceNode.nodeType == 8) {\n        self.viewNode = null; // comment node\n        result = Task.newResult(true);\n      } else {\n        result = self.createTextNodeView();\n      }\n    }\n    result.then((processChildren) => {\n      needToProcessChildren = processChildren;\n      self.nodeContext.viewNode = self.viewNode;\n      if (self.viewNode) {\n        const parent = self.nodeContext.parent\n          ? self.nodeContext.parent.viewNode\n          : self.viewRoot;\n        if (parent) {\n          parent.appendChild(self.viewNode);\n        }\n      }\n      frame.finish(needToProcessChildren);\n    });\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  setCurrent(\n    nodeContext: Vtree.NodeContext,\n    firstTime: boolean,\n    atUnforcedBreak?: boolean,\n  ): Task.Result<boolean> {\n    this.nodeContext = nodeContext;\n    if (nodeContext) {\n      this.sourceNode = nodeContext.sourceNode;\n      this.offsetInNode = nodeContext.offsetInNode;\n    } else {\n      this.sourceNode = null;\n      this.offsetInNode = -1;\n    }\n    this.viewNode = null;\n    if (this.nodeContext) {\n      return this.createNodeView(firstTime, !!atUnforcedBreak);\n    }\n    return Task.newResult(true);\n  }\n\n  processShadowContent(pos: Vtree.NodeContext): Vtree.NodeContext {\n    if (\n      pos.shadowContext == null ||\n      (pos.sourceNode as Element).localName != \"content\" ||\n      pos.sourceNode.namespaceURI != Base.NS.SHADOW\n    ) {\n      return pos;\n    }\n    const boxOffset = pos.boxOffset;\n    const shadow = pos.shadowContext;\n    const parent = pos.parent;\n\n    // content that will be inserted\n    let contentNode: Node;\n    let contentShadowType: Vtree.ShadowType;\n    let contentShadow: Vtree.ShadowContext;\n    if (shadow.subShadow) {\n      contentShadow = shadow.subShadow;\n      contentNode = shadow.root;\n      contentShadowType = shadow.type;\n      if (contentShadowType == Vtree.ShadowType.ROOTLESS) {\n        contentNode = contentNode.firstChild;\n      }\n    } else {\n      contentShadow = shadow.parentShadow;\n      contentNode = shadow.owner.firstChild;\n      contentShadowType = Vtree.ShadowType.ROOTLESS;\n    }\n    const nextSibling = pos.sourceNode.nextSibling;\n    if (nextSibling) {\n      pos.sourceNode = nextSibling;\n      pos.resetView();\n    } else if (pos.shadowSibling) {\n      pos = pos.shadowSibling;\n    } else if (contentNode) {\n      pos = null;\n    } else {\n      pos = pos.parent.modify();\n      pos.after = true;\n    }\n    if (contentNode) {\n      const r = new Vtree.NodeContext(contentNode, parent, boxOffset);\n      r.shadowContext = contentShadow;\n      r.shadowType = contentShadowType;\n      r.shadowSibling = pos;\n      return r;\n    }\n    pos.boxOffset = boxOffset;\n    return pos;\n  }\n\n  private nextPositionInTree(pos: Vtree.NodeContext): Vtree.NodeContext {\n    let boxOffset = pos.boxOffset + 1; // offset for the next position\n    if (pos.after) {\n      // root, that was the last possible position\n      if (!pos.parent) {\n        return null;\n      }\n\n      // we are done with this sourceNode, see if there is a next sibling,\n      // unless this is the root of the shadow tree\n      if (pos.shadowType != Vtree.ShadowType.ROOTED) {\n        const next = pos.sourceNode.nextSibling;\n        if (next) {\n          pos = pos.modify();\n\n          // keep shadowType\n          pos.boxOffset = boxOffset;\n          pos.sourceNode = next;\n          pos.resetView();\n          return this.processShadowContent(pos);\n        }\n      }\n\n      // if no viable siblings, check if there are shadow siblings\n      if (pos.shadowSibling) {\n        // our next position is the element after shadow:content in the parent\n        // shadow tree\n        pos = pos.shadowSibling.modify();\n        pos.boxOffset = boxOffset;\n        return pos;\n      }\n\n      // if not rootless shadow, move to the \"after\" position for the parent\n      pos = pos.parent.modify();\n      pos.boxOffset = boxOffset;\n      pos.after = true;\n      return pos;\n    } else {\n      // any shadow trees?\n      if (pos.nodeShadow) {\n        let shadowNode: Node | null = pos.nodeShadow.root;\n        if (pos.nodeShadow.type == Vtree.ShadowType.ROOTLESS) {\n          shadowNode = shadowNode.firstChild;\n        }\n        if (shadowNode) {\n          const sr = new Vtree.NodeContext(shadowNode, pos, boxOffset);\n          sr.shadowContext = pos.nodeShadow;\n          sr.shadowType = pos.nodeShadow.type;\n          return this.processShadowContent(sr);\n        }\n      }\n\n      // any children?\n      const child = pos.sourceNode.firstChild;\n      if (child) {\n        return this.processShadowContent(\n          new Vtree.NodeContext(child, pos, boxOffset),\n        );\n      }\n\n      // no children - was there text content?\n      if (pos.sourceNode.nodeType != 1) {\n        const content = Diff.restoreNewText(pos.preprocessedTextContent);\n        boxOffset += content.length - 1 - pos.offsetInNode;\n      }\n      pos = pos.modify();\n      pos.boxOffset = boxOffset;\n      pos.after = true;\n      return pos;\n    }\n  }\n\n  isTransclusion(\n    element: Element,\n    elementStyle: CssCascade.ElementStyle,\n    transclusionType: string | null,\n  ) {\n    const proc = CssCascade.getProp(elementStyle, \"hyperlink-processing\");\n    if (!proc) {\n      return false;\n    }\n    const prop = proc.evaluate(this.context, \"hyperlink-processing\");\n    if (!prop) {\n      return false;\n    }\n    return prop.toString() == transclusionType;\n  }\n\n  /**\n   * @override\n   */\n  nextInTree(\n    position: Vtree.NodeContext,\n    atUnforcedBreak?: boolean,\n  ): Task.Result<Vtree.NodeContext> {\n    let nodeContext = this.nextPositionInTree(position);\n    if (!nodeContext || nodeContext.after) {\n      return Task.newResult(nodeContext);\n    }\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"nextInTree\");\n    this.setCurrent(nodeContext, true, atUnforcedBreak).then(\n      (processChildren) => {\n        if (!nodeContext.viewNode || !processChildren) {\n          nodeContext = nodeContext.modify();\n          nodeContext.after = true; // skip\n          if (!nodeContext.viewNode) {\n            nodeContext.inline = true;\n          }\n        }\n        this.dispatchEvent({ type: \"nextInTree\", nodeContext } as any);\n        frame.finish(nodeContext);\n      },\n    );\n    return frame.result();\n  }\n\n  addImageFetchers(bg: Css.Val) {\n    if (bg instanceof Css.CommaList) {\n      const values = (bg as Css.CommaList).values;\n      for (let i = 0; i < values.length; i++) {\n        this.addImageFetchers(values[i]);\n      }\n    } else if (bg instanceof Css.URL) {\n      const url = (bg as Css.URL).url;\n      this.page.fetchers.push(TaskUtil.loadElement(new Image(), url));\n    }\n  }\n\n  applyComputedStyles(\n    target: Element,\n    computedStyle: { [key: string]: Css.Val },\n  ) {\n    const bg = computedStyle[\"background-image\"];\n    if (bg) {\n      this.addImageFetchers(bg);\n    }\n    const isRelativePositioned =\n      computedStyle[\"position\"] === Css.ident.relative;\n    for (const propName in computedStyle) {\n      if (propertiesNotPassedToDOM[propName]) {\n        continue;\n      }\n      let value = computedStyle[propName];\n      value = value.visit(\n        new CssProp.UrlTransformVisitor(\n          this.xmldoc.url,\n          this.documentURLTransformer,\n        ),\n      );\n      if (\n        value.isNumeric() &&\n        Exprs.needUnitConversion((value as Css.Numeric).unit)\n      ) {\n        // font-size for the root element is already converted to px\n        value = Css.convertNumericToPx(value, this.context);\n      }\n      if (\n        Vtree.delayedProps[propName] ||\n        (isRelativePositioned &&\n          Vtree.delayedPropsIfRelativePositioned[propName])\n      ) {\n        // Set it after page layout is done.\n        this.page.delayedItems.push(\n          new Vtree.DelayedItem(target, propName, value),\n        );\n        continue;\n      }\n      Base.setCSSProperty(target, propName, value.toString());\n    }\n  }\n\n  /**\n   * @override\n   */\n  applyPseudoelementStyle(\n    nodeContext: Vtree.NodeContext,\n    pseudoName: string,\n    target: Element,\n  ): void {\n    if (nodeContext.after) {\n      return;\n    }\n    const element = this.sourceNode as Element;\n    const styler = nodeContext.shadowContext\n      ? (nodeContext.shadowContext.styler as CssStyler.AbstractStyler)\n      : this.styler;\n    let elementStyle = styler.getStyle(element, false);\n    const pseudoMap = CssCascade.getStyleMap(elementStyle, \"_pseudos\");\n    if (!pseudoMap) {\n      return;\n    }\n    elementStyle = pseudoMap[pseudoName];\n    if (!elementStyle) {\n      return;\n    }\n    const computedStyle = {};\n    nodeContext.vertical = this.computeStyle(\n      nodeContext.vertical,\n      nodeContext.direction === \"rtl\",\n      elementStyle,\n      computedStyle,\n    );\n    const content = computedStyle[\"content\"];\n    if (Vtree.nonTrivialContent(content)) {\n      content.visit(\n        new Vtree.ContentPropertyHandler(\n          target,\n          this.context,\n          content,\n          this.exprContentListener,\n        ),\n      );\n      delete computedStyle[\"content\"];\n    }\n    this.applyComputedStyles(target, computedStyle);\n  }\n\n  /**\n   * @override\n   */\n  peelOff(\n    nodeContext: Vtree.NodeContext,\n    nodeOffset: number,\n  ): Task.Result<Vtree.NodeContext> {\n    const frame: Task.Frame<Vtree.NodeContext> = Task.newFrame(\"peelOff\");\n    const firstPseudo = nodeContext.firstPseudo;\n    let offsetInNode = nodeContext.offsetInNode;\n    const after = nodeContext.after;\n    if (nodeOffset > 0) {\n      const text = nodeContext.viewNode.textContent;\n      nodeContext.viewNode.textContent = text.substr(0, nodeOffset);\n      offsetInNode += nodeOffset;\n    } else if (!after && nodeContext.viewNode && offsetInNode == 0) {\n      const parent = nodeContext.viewNode.parentNode;\n      if (parent) {\n        parent.removeChild(nodeContext.viewNode);\n      }\n    }\n    const boxOffset = nodeContext.boxOffset + nodeOffset;\n    const arr = [];\n    while (nodeContext.firstPseudo === firstPseudo) {\n      arr.push(nodeContext);\n      nodeContext = nodeContext.parent;\n    }\n    let pn = arr.pop(); // container for that pseudoelement\n    let shadowSibling = pn.shadowSibling;\n    const self = this;\n    frame\n      .loop(() => {\n        while (arr.length > 0) {\n          pn = arr.pop();\n          nodeContext = new Vtree.NodeContext(\n            pn.sourceNode,\n            nodeContext,\n            boxOffset,\n          );\n          if (arr.length == 0) {\n            nodeContext.offsetInNode = offsetInNode;\n            nodeContext.after = after;\n          }\n          nodeContext.shadowType = pn.shadowType;\n          (nodeContext.shadowContext = pn.shadowContext),\n            (nodeContext.nodeShadow = pn.nodeShadow);\n          nodeContext.shadowSibling = pn.shadowSibling\n            ? pn.shadowSibling\n            : shadowSibling;\n          shadowSibling = null;\n          const result = self.setCurrent(nodeContext, false);\n          if (result.isPending()) {\n            return result;\n          }\n        }\n        return Task.newResult(false);\n      })\n      .then(() => {\n        frame.finish(nodeContext);\n      });\n    return frame.result();\n  }\n\n  createElement(ns: string, tag: string): Element {\n    if (ns == Base.NS.XHTML) {\n      return this.document.createElement(tag);\n    }\n    return this.document.createElementNS(ns, tag);\n  }\n\n  /**\n   * @override\n   */\n  applyFootnoteStyle(\n    vertical: boolean,\n    rtl: boolean,\n    target: Element,\n  ): boolean {\n    const computedStyle = {};\n    const pseudoMap = CssCascade.getStyleMap(this.footnoteStyle, \"_pseudos\");\n    vertical = this.computeStyle(\n      vertical,\n      rtl,\n      this.footnoteStyle,\n      computedStyle,\n    );\n    if (pseudoMap && pseudoMap[\"before\"]) {\n      const childComputedStyle = {};\n      const span = this.createElement(Base.NS.XHTML, \"span\");\n      PseudoElement.setPseudoName(span, \"before\");\n      target.appendChild(span);\n      this.computeStyle(vertical, rtl, pseudoMap[\"before\"], childComputedStyle);\n      delete childComputedStyle[\"content\"];\n      this.applyComputedStyles(span, childComputedStyle);\n    }\n    delete computedStyle[\"content\"];\n    this.applyComputedStyles(target, computedStyle);\n    return vertical;\n  }\n\n  /**\n   * @override\n   */\n  processFragmentedBlockEdge(nodeContext: Vtree.NodeContext) {\n    if (nodeContext) {\n      nodeContext.walkUpBlocks((block) => {\n        const boxDecorationBreak = block.inheritedProps[\"box-decoration-break\"];\n        if (!boxDecorationBreak || boxDecorationBreak === \"slice\") {\n          const elem = block.viewNode as Element;\n          Asserts.assert(elem instanceof Element);\n          if (block.vertical) {\n            Base.setCSSProperty(elem, \"padding-left\", \"0\");\n            Base.setCSSProperty(elem, \"border-left\", \"none\");\n            Base.setCSSProperty(elem, \"border-top-left-radius\", \"0\");\n            Base.setCSSProperty(elem, \"border-bottom-left-radius\", \"0\");\n          } else {\n            Base.setCSSProperty(elem, \"padding-bottom\", \"0\");\n            Base.setCSSProperty(elem, \"border-bottom\", \"none\");\n            Base.setCSSProperty(elem, \"border-bottom-left-radius\", \"0\");\n            Base.setCSSProperty(elem, \"border-bottom-right-radius\", \"0\");\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * @override\n   */\n  convertLengthToPx(\n    numeric: Css.Numeric,\n    viewNode: Node,\n    clientLayout: Vtree.ClientLayout,\n  ): number | Css.Numeric {\n    const num = numeric.num;\n    const unit = numeric.unit;\n    if (Exprs.isFontRelativeLengthUnit(unit)) {\n      let elem = viewNode;\n      while (elem && elem.nodeType !== 1) {\n        elem = elem.parentNode;\n      }\n      Asserts.assert(elem);\n      const fontSize = parseFloat(\n        clientLayout.getElementComputedStyle(elem as Element)[\"font-size\"],\n      );\n      Asserts.assert(this.context);\n      return CssCascade.convertFontRelativeLengthToPx(\n        numeric,\n        fontSize,\n        this.context,\n      ).num;\n    } else {\n      const unitSize = this.context.queryUnitSize(unit, false);\n      if (unitSize) {\n        return num * unitSize;\n      } else {\n        return numeric;\n      }\n    }\n  }\n\n  /**\n   * Returns if two NodePositionStep are equivalent.\n   */\n  isSameNodePositionStep(\n    step1: Vtree.NodePositionStep,\n    step2: Vtree.NodePositionStep,\n  ): boolean {\n    if (step1.shadowContext) {\n      if (!step2.shadowContext) {\n        return false;\n      }\n      const elem1 =\n        step1.node.nodeType === 1\n          ? (step1.node as Element)\n          : (step1.node.parentElement as Element);\n      const elem2 =\n        step2.node.nodeType === 1\n          ? (step2.node as Element)\n          : (step2.node.parentElement as Element);\n      return (\n        step1.shadowContext.owner === step2.shadowContext.owner &&\n        PseudoElement.getPseudoName(elem1) ===\n          PseudoElement.getPseudoName(elem2)\n      );\n    } else {\n      return step1.node === step2.node;\n    }\n  }\n\n  /**\n   * @override\n   */\n  isSameNodePosition(\n    nodePosition1: Vtree.NodePosition,\n    nodePosition2: Vtree.NodePosition,\n  ): boolean {\n    return (\n      nodePosition1.offsetInNode === nodePosition2.offsetInNode &&\n      nodePosition1.after == nodePosition2.after &&\n      nodePosition1.steps.length === nodePosition2.steps.length &&\n      nodePosition1.steps.every((step1, i) => {\n        const step2 = nodePosition2.steps[i];\n        return this.isSameNodePositionStep(step1, step2);\n      })\n    );\n  }\n\n  isPseudoelement(elem) {\n    return !!PseudoElement.getPseudoName(elem);\n  }\n}\n\nexport const fb2Remap = {\n  a: \"a\",\n  sub: \"sub\",\n  sup: \"sup\",\n  table: \"table\",\n  tr: \"tr\",\n  td: \"td\",\n  th: \"th\",\n  code: \"code\",\n  body: \"div\",\n  p: \"p\",\n  v: \"p\",\n  date: \"p\",\n  emphasis: \"em\",\n  strong: \"strong\",\n  style: \"span\",\n  strikethrough: \"del\",\n};\n\nexport const propertiesNotPassedToDOM = {\n  \"box-decoration-break\": true,\n  \"float-min-wrap-block\": true,\n  \"float-reference\": true,\n  \"flow-into\": true,\n  \"flow-linger\": true,\n  \"flow-options\": true,\n  \"flow-priority\": true,\n  \"footnote-policy\": true,\n  page: true,\n};\n\nexport class DefaultClientLayout implements Vtree.ClientLayout {\n  layoutBox: Element;\n  window: Window;\n\n  constructor(viewport: Viewport) {\n    this.layoutBox = viewport.layoutBox;\n    this.window = viewport.window;\n  }\n\n  private subtractOffsets(\n    rect: Vtree.ClientRect,\n    originRect: Vtree.ClientRect,\n  ): Vtree.ClientRect {\n    const viewportLeft = originRect.left;\n    const viewportTop = originRect.top;\n    return {\n      left: rect.left - viewportLeft,\n      top: rect.top - viewportTop,\n      right: rect.right - viewportLeft,\n      bottom: rect.bottom - viewportTop,\n      width: rect.width,\n      height: rect.height,\n    } as Vtree.ClientRect;\n  }\n\n  /**\n   * @override\n   */\n  getRangeClientRects(range: Range): ClientRect[] {\n    const rects = range[\"getClientRects\"]();\n    const layoutBoxRect = this.layoutBox.getBoundingClientRect();\n    return Array.from(rects).map((rect) =>\n      this.subtractOffsets(rect, layoutBoxRect),\n    );\n  }\n\n  /**\n   * @override\n   */\n  getElementClientRect(element: Element): ClientRect {\n    const htmlElement = element as HTMLElement;\n    const rect = htmlElement.getBoundingClientRect() as Vtree.ClientRect;\n    const layoutBoxRect = this.layoutBox.getBoundingClientRect();\n    return this.subtractOffsets(rect, layoutBoxRect);\n  }\n\n  /**\n   * @override\n   */\n  getElementComputedStyle(element: Element): CSSStyleDeclaration {\n    return this.window.getComputedStyle(element, null);\n  }\n}\n\nexport class Viewport {\n  document: Document;\n  root: HTMLElement;\n  private outerZoomBox: HTMLElement;\n  contentContainer: HTMLElement;\n  layoutBox: Element;\n  width: number;\n  height: number;\n\n  constructor(\n    public readonly window: Window,\n    public readonly fontSize: number,\n    opt_root?: HTMLElement,\n    opt_width?: number,\n    opt_height?: number,\n  ) {\n    this.document = window.document;\n    this.root = opt_root || this.document.body;\n    let outerZoomBox = this.root.firstElementChild;\n    if (!outerZoomBox) {\n      outerZoomBox = this.document.createElement(\"div\");\n      outerZoomBox.setAttribute(\"data-vivliostyle-outer-zoom-box\", \"true\");\n      this.root.appendChild(outerZoomBox);\n    }\n    let contentContainer = outerZoomBox.firstElementChild;\n    if (!contentContainer) {\n      contentContainer = this.document.createElement(\"div\");\n      contentContainer.setAttribute(\n        \"data-vivliostyle-spread-container\",\n        \"true\",\n      );\n      outerZoomBox.appendChild(contentContainer);\n    }\n    let layoutBox = outerZoomBox.nextElementSibling;\n    if (!layoutBox) {\n      layoutBox = this.document.createElement(\"div\");\n      layoutBox.setAttribute(\"data-vivliostyle-layout-box\", \"true\");\n      this.root.appendChild(layoutBox);\n    }\n    this.outerZoomBox = outerZoomBox as HTMLElement;\n    this.contentContainer = contentContainer as HTMLElement;\n    this.layoutBox = layoutBox as HTMLElement;\n    const clientLayout = new DefaultClientLayout(this);\n    const computedStyle = clientLayout.getElementComputedStyle(this.root);\n    this.width =\n      opt_width || parseFloat(computedStyle[\"width\"]) || window.innerWidth;\n    this.height =\n      opt_height || parseFloat(computedStyle[\"height\"]) || window.innerHeight;\n  }\n\n  /**\n   * Reset zoom.\n   */\n  resetZoom() {\n    Base.setCSSProperty(this.outerZoomBox, \"width\", \"\");\n    Base.setCSSProperty(this.outerZoomBox, \"height\", \"\");\n    Base.setCSSProperty(this.contentContainer, \"width\", \"\");\n    Base.setCSSProperty(this.contentContainer, \"height\", \"\");\n    Base.setCSSProperty(this.contentContainer, \"transform\", \"\");\n  }\n\n  /**\n   * Zoom viewport.\n   * @param width Overall width of contents before scaling (px)\n   * @param height Overall height of contents before scaling (px)\n   * @param scale Factor to which the viewport will be scaled.\n   */\n  zoom(width: number, height: number, scale: number) {\n    Base.setCSSProperty(this.outerZoomBox, \"width\", `${width * scale}px`);\n    Base.setCSSProperty(this.outerZoomBox, \"height\", `${height * scale}px`);\n    Base.setCSSProperty(this.contentContainer, \"width\", `${width}px`);\n    Base.setCSSProperty(this.contentContainer, \"height\", `${height}px`);\n    Base.setCSSProperty(this.contentContainer, \"transform\", `scale(${scale})`);\n  }\n\n  /**\n   * Remove all pages inside the viewport.\n   */\n  clear() {\n    const root = this.root;\n    while (root.lastChild) {\n      root.removeChild(root.lastChild);\n    }\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview XmlDoc - Utility functions to work with XML (mostly XHTML)\n * documents.\n */\nimport * as Base from \"./base\";\nimport * as Net from \"./net\";\nimport * as Task from \"./task\";\nimport { XmlDoc } from \"./types\";\n\nexport type XMLDocStore = XmlDoc.XMLDocStore;\n\nexport const ELEMENT_OFFSET_ATTR = \"data-adapt-eloff\";\n\nexport class XMLDocHolder implements XmlDoc.XMLDocHolder {\n  lang: string | null = null;\n  totalOffset: number = -1;\n  root: Element;\n  body: Element;\n  head: Element;\n  last: Element;\n  lastOffset: number = 1;\n  idMap: { [key: string]: Element };\n\n  constructor(\n    public readonly store: XMLDocStore,\n    public readonly url: string,\n    public readonly document: Document,\n  ) {\n    this.root = document.documentElement; // html element\n    let body: Element = null;\n    let head: Element = null;\n    if (this.root.namespaceURI == Base.NS.XHTML) {\n      for (\n        let child: Node = this.root.firstChild;\n        child;\n        child = child.nextSibling\n      ) {\n        if (child.nodeType != 1) {\n          continue;\n        }\n        const elem = child as Element;\n        if (elem.namespaceURI == Base.NS.XHTML) {\n          switch (elem.localName) {\n            case \"head\":\n              head = elem;\n              break;\n            case \"body\":\n              body = elem;\n              break;\n          }\n        }\n      }\n      this.lang = this.root.getAttribute(\"lang\");\n    } else if (this.root.namespaceURI == Base.NS.FB2) {\n      head = this.root;\n      for (\n        let child: Node = this.root.firstChild;\n        child;\n        child = child.nextSibling\n      ) {\n        if (child.nodeType != 1) {\n          continue;\n        }\n        const elem = child as Element;\n        if (elem.namespaceURI == Base.NS.FB2) {\n          if (elem.localName == \"body\") {\n            body = elem;\n          }\n        }\n      }\n      const langs = this.doc()\n        .child(\"FictionBook\")\n        .child(\"description\")\n        .child(\"title-info\")\n        .child(\"lang\")\n        .textContent();\n      if (langs.length > 0) {\n        this.lang = langs[0];\n      }\n    } else if (this.root.namespaceURI == Base.NS.SSE) {\n      // treat <meta> element as \"head\" of the document\n      for (\n        let elem = this.root.firstElementChild;\n        elem;\n        elem = elem.nextElementSibling\n      ) {\n        const localName = elem.localName;\n        if (localName === \"meta\") {\n          head = elem;\n        } else if (localName === \"body\") {\n          body = elem;\n        }\n      }\n    }\n    this.body = body as Element;\n    this.head = head as Element;\n    this.last = this.root;\n    this.last.setAttribute(ELEMENT_OFFSET_ATTR, \"0\");\n  }\n\n  doc(): XmlDoc.NodeList {\n    return new NodeList([this.document]);\n  }\n\n  getElementOffset(element: Element): number {\n    const offsetStr = element.getAttribute(ELEMENT_OFFSET_ATTR);\n    if (offsetStr) {\n      return parseInt(offsetStr, 10);\n    }\n    let offset = this.lastOffset;\n    let last: Node | null = this.last;\n    while (last != element) {\n      let next: Node | null = last.firstChild;\n      if (!next) {\n        while (true) {\n          next = last.nextSibling;\n          if (next) {\n            break;\n          }\n          last = last.parentNode;\n          if (last == null) {\n            throw new Error(\"Internal error\");\n          }\n        }\n      }\n      last = next;\n      if (next.nodeType == 1) {\n        const nextElement = next as Element;\n        nextElement.setAttribute(ELEMENT_OFFSET_ATTR, offset.toString());\n        ++offset;\n      } else {\n        offset += (next.textContent as string).length;\n      }\n    }\n    this.lastOffset = offset;\n    this.last = element;\n    return offset - 1;\n  }\n\n  getNodeOffset(srcNode: Node, offsetInNode: number, after: boolean) {\n    let extraOffset = 0;\n    let node: Node | null = srcNode;\n    let prev: Node | null = null;\n    if (node.nodeType == 1) {\n      // after = true is only valid for elements\n      if (!after) {\n        return this.getElementOffset(node as Element);\n      }\n    } else {\n      // offsetInNode is only valid for text nodes\n      extraOffset = offsetInNode;\n      prev = node.previousSibling;\n      if (!prev) {\n        node = node.parentNode;\n        extraOffset += 1;\n        return this.getElementOffset(node as Element) + extraOffset;\n      }\n      node = prev;\n    }\n    while (true) {\n      while (node.lastChild) {\n        node = node.lastChild;\n      }\n      if (node.nodeType == 1) {\n        // empty element\n        break;\n      }\n      extraOffset += (node.textContent as string).length;\n      prev = node.previousSibling;\n      if (!prev) {\n        node = node.parentNode;\n        break;\n      }\n      node = prev;\n    }\n    extraOffset += 1;\n    return this.getElementOffset(node as Element) + extraOffset;\n  }\n\n  getTotalOffset(): number {\n    if (this.totalOffset < 0) {\n      this.totalOffset = this.getNodeOffset(this.root, 0, true);\n    }\n    return this.totalOffset;\n  }\n\n  /**\n   * @return last node such that its offset is less or equal to the given\n   */\n  getNodeByOffset(offset: number): Node {\n    let elementOffset: number;\n\n    // First, find the last element in the document, such that\n    // this.getElementOffset(element) <= offset; if offest matches\n    // exactly, just return it.\n    const self = this;\n    let element = this.root;\n    while (true) {\n      elementOffset = this.getElementOffset(element);\n      if (elementOffset >= offset) {\n        return element;\n      }\n      const children = element.children; // Element children\n      if (!children) {\n        break;\n      }\n      const index = Base.binarySearch(children.length, (index) => {\n        const child = children[index];\n        const childOffset = self.getElementOffset(child);\n        return childOffset > offset;\n      });\n      if (index == 0) {\n        break;\n      }\n      if (VIVLIOSTYLE_DEBUG) {\n        if (index < children.length) {\n          const elemOffset = self.getElementOffset(children[index]);\n          if (elemOffset <= offset) {\n            throw new Error(\"Consistency check failed!\");\n          }\n        }\n      }\n      element = children[index - 1];\n    }\n\n    // Now we have element with offset less than desired. Find following\n    // (non-element) node with the right offset.\n    let nodeOffset = elementOffset + 1;\n    let node: Node | null = element;\n    let next: Node | null = node.firstChild || node.nextSibling;\n    let lastGood: Node | null = null;\n    while (true) {\n      if (next) {\n        if (next.nodeType == 1) {\n          break;\n        }\n        node = next;\n        lastGood = node;\n        nodeOffset += (next.textContent as string).length;\n        if (nodeOffset > offset) {\n          break;\n        }\n      } else {\n        node = node.parentNode;\n        if (!node) {\n          break;\n        }\n      }\n      next = node.nextSibling;\n    }\n    return lastGood || element;\n  }\n\n  private buildIdMap(e: Element): void {\n    const id = e.getAttribute(\"id\");\n    if (id && !this.idMap[id]) {\n      this.idMap[id] = e;\n    }\n    const xmlid = e.getAttributeNS(Base.NS.XML, \"id\");\n    if (xmlid && !this.idMap[xmlid]) {\n      this.idMap[xmlid] = e;\n    }\n    for (let c = e.firstElementChild; c; c = c.nextElementSibling) {\n      this.buildIdMap(c);\n    }\n  }\n\n  /**\n   * Get element by URL in the source document(s). URL must be in either '#id'\n   * or 'url#id' form.\n   */\n  getElement(url: string): Element | null {\n    const m = url.match(/([^#]*)#(.+)$/);\n    if (!m || (m[1] && m[1] != this.url)) {\n      return null;\n    }\n    const id = m[2];\n    let r: Element = this.document.getElementById(id);\n    if (!r && this.document.getElementsByName) {\n      r = this.document.getElementsByName(id)[0];\n    }\n    if (!r) {\n      if (!this.idMap) {\n        this.idMap = {};\n        this.buildIdMap(this.document.documentElement);\n      }\n      r = this.idMap[id];\n    }\n    return r;\n  }\n}\n\n/**\n * cf. https://w3c.github.io/DOM-Parsing/#the-domparser-interface\n * @enum {string}\n */\nexport enum DOMParserSupportedType {\n  TEXT_HTML = \"text/html\",\n  TEXT_XML = \"text/xml\",\n  APPLICATION_XML = \"application/xml\",\n  APPLICATION_XHTML_XML = \"application/xhtml_xml\",\n  IMAGE_SVG_XML = \"image/svg+xml\",\n}\n\n/**\n * Parses a string with a DOMParser and returns the document.\n * If a parse error occurs, return null.\n */\nexport function parseAndReturnNullIfError(\n  str: string,\n  type: string,\n  opt_parser?: DOMParser,\n): Document | null {\n  const parser = opt_parser || new DOMParser();\n  let doc: Document;\n  try {\n    doc = parser.parseFromString(str, type as SupportedType);\n  } catch (e) {}\n  if (!doc) {\n    return null;\n  } else {\n    const docElement = doc.documentElement;\n    const errorTagName = \"parsererror\";\n    if (docElement.localName === errorTagName) {\n      return null;\n    } else {\n      for (let c = docElement.firstElementChild; c; c = c.nextElementSibling) {\n        if (c.localName === errorTagName) {\n          return null;\n        }\n      }\n    }\n  }\n  return doc;\n}\n\n/**\n * @returns null if contentType cannot be inferred from HTTP header and file\n *     extension\n */\nexport function resolveContentType(response: Net.Response): string | null {\n  const contentType = response.contentType;\n  if (contentType) {\n    const supportedKeys = Object.keys(DOMParserSupportedType);\n    for (let i = 0; i < supportedKeys.length; i++) {\n      if (DOMParserSupportedType[supportedKeys[i]] === contentType) {\n        return contentType;\n      }\n    }\n    if (contentType.match(/\\+xml$/)) {\n      return DOMParserSupportedType.APPLICATION_XML;\n    }\n  }\n  const match = response.url.match(/\\.([^./]+)$/);\n  if (match) {\n    const extension = match[1];\n    switch (extension) {\n      case \"html\":\n      case \"htm\":\n        return DOMParserSupportedType.TEXT_HTML;\n      case \"xhtml\":\n      case \"xht\":\n        return DOMParserSupportedType.APPLICATION_XHTML_XML;\n      case \"svg\":\n      case \"svgz\":\n        return DOMParserSupportedType.IMAGE_SVG_XML;\n      case \"opf\":\n      case \"xml\":\n        return DOMParserSupportedType.APPLICATION_XML;\n    }\n  }\n  return null;\n}\n\nexport function parseXMLResource(\n  response: Net.Response,\n  store: XMLDocStore,\n): Task.Result<XmlDoc.XMLDocHolder> {\n  let doc = response.responseXML;\n  if (!doc) {\n    const parser = new DOMParser();\n    const text = response.responseText;\n    if (text) {\n      const contentType = resolveContentType(response);\n      doc = parseAndReturnNullIfError(\n        text,\n        contentType || DOMParserSupportedType.APPLICATION_XML,\n        parser,\n      );\n\n      // When contentType cannot be inferred from HTTP header and file\n      // extension, we use root element's tag name to infer the contentType. If\n      // it is html or svg, we re-parse the source with an appropriate\n      // contentType.\n      if (doc && !contentType) {\n        const root = doc.documentElement;\n        if (root.localName.toLowerCase() === \"html\" && !root.namespaceURI) {\n          doc = parseAndReturnNullIfError(\n            text,\n            DOMParserSupportedType.TEXT_HTML,\n            parser,\n          );\n        } else if (\n          root.localName.toLowerCase() === \"svg\" &&\n          (doc as any).contentType !== DOMParserSupportedType.IMAGE_SVG_XML\n        ) {\n          doc = parseAndReturnNullIfError(\n            text,\n            DOMParserSupportedType.IMAGE_SVG_XML,\n            parser,\n          );\n        }\n      }\n      if (!doc) {\n        // Fallback to HTML parsing\n        doc = parseAndReturnNullIfError(\n          text,\n          DOMParserSupportedType.TEXT_HTML,\n          parser,\n        );\n      }\n    }\n  }\n  const xmldoc = doc ? new XMLDocHolder(store, response.url, doc) : null;\n  return Task.newResult(xmldoc);\n}\n\nexport function newXMLDocStore(): XMLDocStore {\n  return new Net.ResourceStore(\n    parseXMLResource,\n    Net.XMLHttpRequestResponseType.DOCUMENT,\n  );\n}\n\nexport class Predicate implements XmlDoc.Predicate {\n  constructor(public readonly fn: (p1: Node) => boolean) {}\n\n  check(node: Node): boolean {\n    return this.fn(node);\n  }\n\n  withAttribute(name: string, value: string): Predicate {\n    const self = this;\n    return new Predicate(\n      (node) =>\n        self.check(node) &&\n        node.nodeType == 1 &&\n        (node as Element).getAttribute(name) == value,\n    );\n  }\n\n  withChild(name: string, opt_childPredicate?: Predicate): Predicate {\n    const self = this;\n    return new Predicate((node) => {\n      if (!self.check(node)) {\n        return false;\n      }\n      let list = new NodeList([node]);\n      list = list.child(name);\n      if (opt_childPredicate) {\n        list = list.predicate(opt_childPredicate);\n      }\n      return list.size() > 0;\n    });\n  }\n}\n\nexport const predicate = new Predicate((node) => true);\n\nexport class NodeList implements XmlDoc.NodeList {\n  constructor(public readonly nodes: Node[]) {}\n\n  asArray(): Node[] {\n    return this.nodes;\n  }\n\n  size(): number {\n    return this.nodes.length;\n  }\n\n  /**\n   * Filter with predicate\n   */\n  predicate(pr: Predicate): NodeList {\n    const arr = [];\n    for (const n of this.nodes) {\n      if (pr.check(n)) {\n        arr.push(n);\n      }\n    }\n    return new NodeList(arr);\n  }\n\n  forEachNode(fn: (p1: Node, p2: (p1: Node) => void) => void): NodeList {\n    const arr = [];\n    const add = (n) => {\n      arr.push(n);\n    };\n    for (let i = 0; i < this.nodes.length; i++) {\n      fn(this.nodes[i], add);\n    }\n    return new NodeList(arr);\n  }\n\n  /**\n   * @template T\n   */\n  forEach<T>(fn: (p1: Node) => T): T[] {\n    const arr = [];\n    for (let i = 0; i < this.nodes.length; i++) {\n      arr.push(fn(this.nodes[i]));\n    }\n    return arr;\n  }\n\n  /**\n   * @template T\n   */\n  forEachNonNull<T>(fn: (p1: Node) => T): T[] {\n    const arr = [];\n    for (let i = 0; i < this.nodes.length; i++) {\n      const t = fn(this.nodes[i]);\n      if (t != null) {\n        arr.push(t);\n      }\n    }\n    return arr;\n  }\n\n  child(tag: string): NodeList {\n    return this.forEachNode((node, add) => {\n      for (let c: Node = node.firstChild; c; c = c.nextSibling) {\n        if (c.nodeType == 1 && (c as Element).localName == tag) {\n          add(c);\n        }\n      }\n    });\n  }\n\n  childElements(): NodeList {\n    return this.forEachNode((node, add) => {\n      for (let c: Node = node.firstChild; c; c = c.nextSibling) {\n        if (c.nodeType == 1) {\n          add(c);\n        }\n      }\n    });\n  }\n\n  attribute(name: string): (string | null)[] {\n    return this.forEachNonNull((node) => {\n      if (node.nodeType == 1) {\n        return (node as Element).getAttribute(name);\n      }\n      return null;\n    });\n  }\n\n  textContent(): (string | null)[] {\n    return this.forEach((node) => node.textContent);\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Ops - Render EPUB content files by applying page masters,\n * styling and layout.\n */\nimport \"./footnotes\";\nimport \"./table\";\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Break from \"./break\";\nimport * as Columns from \"./columns\";\nimport * as Constants from \"./constants\";\nimport * as Counters from \"./counters\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssProp from \"./css-prop\";\nimport * as CssStyler from \"./css-styler\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as CssValidator from \"./css-validator\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as GeometryUtil from \"./geometry-util\";\nimport * as Layout from \"./layout\";\nimport * as LayoutProcessor from \"./layout-processor\";\nimport * as Logging from \"./logging\";\nimport * as Net from \"./net\";\nimport * as PageFloats from \"./page-floats\";\nimport * as CssPage from \"./css-page\";\nimport * as Plugin from \"./plugin\";\nimport * as PageMaster from \"./page-master\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\nimport * as Vgen from \"./vgen\";\nimport * as Vtree from \"./vtree\";\nimport * as XmlDoc from \"./xml-doc\";\nimport { Layout as LayoutType } from \"./types\";\nimport UserAgentBaseCss from \"./assets/user-agent-base.css\";\nimport UserAgentPageCss from \"./assets/user-agent-page.css\";\n\nexport const uaStylesheetBaseFetcher: TaskUtil.Fetcher<boolean> = new TaskUtil.Fetcher(\n  () => {\n    const frame: Task.Frame<boolean> = Task.newFrame(\"uaStylesheetBase\");\n    const validatorSet = CssValidator.baseValidatorSet();\n    const url = Base.resolveURL(\"user-agent-base.css\", Base.resourceBaseURL);\n    const handler = new CssCascade.CascadeParserHandler(\n      null,\n      null,\n      null,\n      null,\n      null,\n      validatorSet,\n      true,\n    );\n    handler.startStylesheet(CssParser.StylesheetFlavor.USER_AGENT);\n    CssCascade.setUABaseCascade(handler.cascade);\n    CssParser.parseStylesheetFromText(\n      UserAgentBaseCss,\n      handler,\n      url,\n      null,\n      null,\n    ).thenFinish(frame);\n    return frame.result();\n  },\n  \"uaStylesheetBaseFetcher\",\n);\n\nexport function loadUABase(): Task.Result<boolean> {\n  return uaStylesheetBaseFetcher.get();\n}\n\nexport type FontFace = {\n  properties: CssCascade.ElementStyle;\n  condition: Exprs.Val;\n};\n\nexport class Style {\n  fontDeobfuscator:\n    | ((p1: string) => ((p1: Blob) => Task.Result<Blob>) | null)\n    | null;\n  validatorSet: CssValidator.ValidatorSet;\n\n  constructor(\n    public readonly store: OPSDocStore,\n    public readonly rootScope: Exprs.LexicalScope,\n    public readonly pageScope: Exprs.LexicalScope,\n    public readonly cascade: CssCascade.Cascade,\n    public readonly rootBox: PageMaster.RootPageBox,\n    public readonly fontFaces: FontFace[],\n    public readonly footnoteProps: CssCascade.ElementStyle,\n    public readonly flowProps: { [key: string]: CssCascade.ElementStyle },\n    public readonly viewportProps: CssCascade.ElementStyle[],\n    public readonly pageProps: { [key: string]: CssCascade.ElementStyle },\n  ) {\n    this.fontDeobfuscator = store.fontDeobfuscator;\n    this.validatorSet = store.validatorSet;\n    this.pageScope.defineBuiltIn(\"has-content\", function(name) {\n      name = name as string;\n      const styleInstance = this as StyleInstance;\n      const cp = styleInstance.currentLayoutPosition;\n      const flowChunk = cp.firstFlowChunkOfFlow(name);\n      return (\n        styleInstance.matchPageSide(cp.startSideOfFlow(name as string)) &&\n        cp.hasContent(name as string, styleInstance.lookupOffset) &&\n        !!flowChunk &&\n        !styleInstance.flowChunkIsAfterParentFlowForcedBreak(flowChunk)\n      );\n    });\n    this.pageScope.defineName(\n      \"page-number\",\n      new Exprs.Native(\n        this.pageScope,\n        function() {\n          const styleInstance = this as StyleInstance;\n          return (\n            styleInstance.pageNumberOffset +\n            styleInstance.currentLayoutPosition.page\n          );\n        },\n        \"page-number\",\n      ),\n    );\n  }\n\n  sizeViewport(\n    viewportWidth: number,\n    viewportHeight: number,\n    fontSize: number,\n    pref?: Exprs.Preferences,\n  ): { width: number; height: number; fontSize: number } {\n    if (this.viewportProps.length) {\n      const context = new Exprs.Context(\n        this.rootScope,\n        viewportWidth,\n        viewportHeight,\n        fontSize,\n      );\n      const viewportProps = CssCascade.mergeAll(context, this.viewportProps);\n      const width = viewportProps[\"width\"];\n      const height = viewportProps[\"height\"];\n      const textZoom = viewportProps[\"text-zoom\"];\n      let scaleFactor = 1;\n      if ((width && height) || textZoom) {\n        const defaultFontSize = Exprs.defaultUnitSizes[\"em\"];\n        const zoomVal = textZoom\n          ? textZoom.evaluate(context, \"text-zoom\")\n          : null;\n        if (zoomVal === Css.ident.scale) {\n          scaleFactor = defaultFontSize / fontSize;\n          fontSize = defaultFontSize;\n          viewportWidth *= scaleFactor;\n          viewportHeight *= scaleFactor;\n        }\n        if (width && height) {\n          const widthVal = Css.toNumber(\n            width.evaluate(context, \"width\"),\n            context,\n          );\n          const heightVal = Css.toNumber(\n            height.evaluate(context, \"height\"),\n            context,\n          );\n          if (widthVal > 0 && heightVal > 0) {\n            const spreadWidth =\n              pref && pref.spreadView\n                ? (widthVal + pref.pageBorder) * 2\n                : widthVal;\n            return { width: spreadWidth, height: heightVal, fontSize };\n          }\n        }\n      }\n    }\n    return { width: viewportWidth, height: viewportHeight, fontSize };\n  }\n}\n\n//-------------------------------------------------------------------------------\nexport class StyleInstance extends Exprs.Context\n  implements\n    CssStyler.FlowListener,\n    PageMaster.InstanceHolder,\n    Vgen.StylerProducer {\n  lang: string | null;\n  primaryFlows = { body: true } as { [key: string]: boolean };\n  rootPageBoxInstance: PageMaster.RootPageBoxInstance = null;\n  styler: CssStyler.Styler = null;\n  stylerMap: { [key: string]: CssStyler.Styler } = null;\n  currentLayoutPosition: Vtree.LayoutPosition = null;\n  layoutPositionAtPageStart: Vtree.LayoutPosition = null;\n  lookupOffset: number = 0;\n  faces: Font.DocumentFaces;\n  pageBoxInstances: { [key: string]: PageMaster.PageBoxInstance } = {};\n  pageManager: CssPage.PageManager = null;\n  private rootPageFloatLayoutContext: PageFloats.PageFloatLayoutContext;\n  pageBreaks: { [key: string]: boolean } = {};\n  pageProgression: Constants.PageProgression | null = null;\n  pageSheetSize: { [key: string]: { width: number; height: number } } = {};\n  pageSheetHeight: number = 0;\n  pageSheetWidth: number = 0;\n  actualPageWidth: number;\n  actualPageHeight: number;\n\n  constructor(\n    public readonly style: Style,\n    public readonly xmldoc: XmlDoc.XMLDocHolder,\n    defaultLang: string | null,\n    public readonly viewport: Vgen.Viewport,\n    public readonly clientLayout: Vtree.ClientLayout,\n    public readonly fontMapper: Font.Mapper,\n    public readonly customRenderer: Vgen.CustomRenderer,\n    public readonly fallbackMap: { [key: string]: string },\n    public readonly pageNumberOffset: number,\n    public readonly documentURLTransformer: Base.DocumentURLTransformer,\n    public readonly counterStore: Counters.CounterStore,\n    pageProgression?: Constants.PageProgression,\n  ) {\n    super(style.rootScope, viewport.width, viewport.height, viewport.fontSize);\n    this.lang = xmldoc.lang || defaultLang;\n    this.faces = new Font.DocumentFaces(this.style.fontDeobfuscator);\n    this.rootPageFloatLayoutContext = new PageFloats.PageFloatLayoutContext(\n      null,\n      null,\n      null,\n      null,\n      null,\n      null,\n      null,\n    );\n    this.pageProgression = pageProgression || null;\n    for (const flowName in style.flowProps) {\n      const flowStyle = style.flowProps[flowName];\n      const consume = CssCascade.getProp(flowStyle, \"flow-consume\");\n      if (consume) {\n        const consumeVal = consume.evaluate(this, \"flow-consume\");\n        if (consumeVal == Css.ident.all) {\n          this.primaryFlows[flowName] = true;\n        } else {\n          delete this.primaryFlows[flowName];\n        }\n      }\n    }\n  }\n\n  init(): Task.Result<boolean> {\n    const self = this;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"StyleInstance.init\");\n    const counterListener = self.counterStore.createCounterListener(\n      self.xmldoc.url,\n    );\n    const counterResolver = self.counterStore.createCounterResolver(\n      self.xmldoc.url,\n      self.style.rootScope,\n      self.style.pageScope,\n    );\n    self.styler = new CssStyler.Styler(\n      self.xmldoc,\n      self.style.cascade,\n      self.style.rootScope,\n      self,\n      this.primaryFlows,\n      self.style.validatorSet,\n      counterListener,\n      counterResolver,\n    );\n    counterResolver.setStyler(self.styler);\n    self.styler.resetFlowChunkStream(self);\n    self.stylerMap = {};\n    self.stylerMap[self.xmldoc.url] = self.styler;\n    const docElementStyle = self.styler.getTopContainerStyle();\n    if (!self.pageProgression) {\n      self.pageProgression = CssPage.resolvePageProgression(docElementStyle);\n    }\n    const rootBox = this.style.rootBox;\n    this.rootPageBoxInstance = new PageMaster.RootPageBoxInstance(rootBox);\n    const cascadeInstance = this.style.cascade.createInstance(\n      self,\n      counterListener,\n      counterResolver,\n      this.lang,\n    );\n    this.rootPageBoxInstance.applyCascadeAndInit(\n      cascadeInstance,\n      docElementStyle,\n    );\n    this.rootPageBoxInstance.resolveAutoSizing(self);\n    this.pageManager = new CssPage.PageManager(\n      cascadeInstance,\n      this.style.pageScope,\n      this.rootPageBoxInstance,\n      self,\n      docElementStyle,\n    );\n    const srcFaces = [] as Font.Face[];\n    for (const fontFace of self.style.fontFaces) {\n      if (fontFace.condition && !fontFace.condition.evaluate(self)) {\n        continue;\n      }\n      const properties = Font.prepareProperties(fontFace.properties, self);\n      const srcFace = new Font.Face(properties);\n      srcFaces.push(srcFace);\n    }\n    self.fontMapper.findOrLoadFonts(srcFaces, self.faces).thenFinish(frame);\n\n    // Determine page sheet sizes corresponding to page selectors\n    const pageProps = self.style.pageProps;\n    Object.keys(pageProps).forEach((selector) => {\n      const pageSizeAndBleed = CssPage.evaluatePageSizeAndBleed(\n        CssPage.resolvePageSizeAndBleed(pageProps[selector] as any),\n        this,\n      );\n      this.pageSheetSize[selector] = {\n        width: pageSizeAndBleed.pageWidth + pageSizeAndBleed.cropOffset * 2,\n        height: pageSizeAndBleed.pageHeight + pageSizeAndBleed.cropOffset * 2,\n      };\n    });\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  getStylerForDoc(xmldoc: XmlDoc.XMLDocHolder): CssStyler.AbstractStyler {\n    let styler = this.stylerMap[xmldoc.url];\n    if (!styler) {\n      const style = this.style.store.getStyleForDoc(xmldoc);\n\n      // We need a separate content, so that variables can get potentially\n      // different values.\n      const context = new Exprs.Context(\n        style.rootScope,\n        this.pageWidth(),\n        this.pageHeight(),\n        this.initialFontSize,\n      );\n      const counterListener = this.counterStore.createCounterListener(\n        xmldoc.url,\n      );\n      const counterResolver = this.counterStore.createCounterResolver(\n        xmldoc.url,\n        style.rootScope,\n        style.pageScope,\n      );\n      styler = new CssStyler.Styler(\n        xmldoc,\n        style.cascade,\n        style.rootScope,\n        context,\n        this.primaryFlows,\n        style.validatorSet,\n        counterListener,\n        counterResolver,\n      );\n      this.stylerMap[xmldoc.url] = styler;\n    }\n    return styler;\n  }\n\n  /**\n   * @override\n   */\n  registerInstance(key: string, instance: PageMaster.PageBoxInstance): void {\n    this.pageBoxInstances[key] = instance;\n  }\n\n  /**\n   * @override\n   */\n  lookupInstance(key: string): PageMaster.PageBoxInstance {\n    return this.pageBoxInstances[key];\n  }\n\n  /**\n   * @override\n   */\n  encounteredFlowChunk(flowChunk: Vtree.FlowChunk, flow: Vtree.Flow): any {\n    const cp = this.currentLayoutPosition;\n    if (cp) {\n      if (!cp.flows[flowChunk.flowName]) {\n        cp.flows[flowChunk.flowName] = flow;\n      } else {\n        flow = cp.flows[flowChunk.flowName];\n      }\n      let flowPosition = cp.flowPositions[flowChunk.flowName];\n      if (!flowPosition) {\n        flowPosition = new Vtree.FlowPosition();\n        cp.flowPositions[flowChunk.flowName] = flowPosition;\n      }\n      const nodePosition = Vtree.newNodePositionFromNode(flowChunk.element);\n      const chunkPosition = new Vtree.ChunkPosition(nodePosition);\n      const flowChunkPosition = new Vtree.FlowChunkPosition(\n        chunkPosition,\n        flowChunk,\n      );\n      flowPosition.positions.push(flowChunkPosition);\n    }\n  }\n\n  getConsumedOffset(flowPosition: Vtree.FlowPosition): number {\n    let offset = Number.POSITIVE_INFINITY;\n    for (let i = 0; i < flowPosition.positions.length; i++) {\n      const pos = flowPosition.positions[i].chunkPosition.primary;\n      let node = pos.steps[0].node;\n      let offsetInNode = pos.offsetInNode;\n      let after = pos.after;\n      let k = 0;\n      while (node.ownerDocument != this.xmldoc.document) {\n        k++;\n        node = pos.steps[k].node;\n        after = false;\n        offsetInNode = 0;\n      }\n      const chunkOffset = this.xmldoc.getNodeOffset(node, offsetInNode, after);\n      if (chunkOffset < offset) {\n        offset = chunkOffset;\n      }\n    }\n    return offset;\n  }\n\n  /**\n   * @param noLookAhead Do not look ahead elements that are not styled yet\n   * @return document offset of the given layoutPosition\n   */\n  getPosition(\n    layoutPosition?: Vtree.LayoutPosition,\n    noLookAhead?: boolean,\n  ): number {\n    if (!layoutPosition) {\n      return 0;\n    }\n    let currentPosition = Number.POSITIVE_INFINITY;\n    for (const flowName in this.primaryFlows) {\n      let flowPosition = layoutPosition.flowPositions[flowName];\n      if (\n        !noLookAhead &&\n        (!flowPosition || flowPosition.positions.length == 0) &&\n        this.currentLayoutPosition\n      ) {\n        this.styler.styleUntilFlowIsReached(flowName);\n        flowPosition = this.currentLayoutPosition.flowPositions[flowName];\n        if (layoutPosition != this.currentLayoutPosition) {\n          if (flowPosition) {\n            flowPosition = flowPosition.clone();\n            layoutPosition.flowPositions[flowName] = flowPosition;\n          }\n        }\n      }\n      if (flowPosition) {\n        const consumedOffset = this.getConsumedOffset(flowPosition);\n        if (consumedOffset < currentPosition) {\n          currentPosition = consumedOffset;\n        }\n      }\n    }\n    return currentPosition;\n  }\n\n  dumpLocation(position) {\n    Logging.logger.debug(\"Location - page\", this.currentLayoutPosition.page);\n    Logging.logger.debug(\"  current:\", position);\n    Logging.logger.debug(\"  lookup:\", this.lookupOffset);\n    for (const flowName in this.currentLayoutPosition.flowPositions) {\n      const flowPosition = this.currentLayoutPosition.flowPositions[flowName];\n      for (const p of flowPosition.positions) {\n        Logging.logger.debug(\n          \"  Chunk\",\n          `${flowName}:`,\n          p.flowChunk.startOffset,\n        );\n      }\n    }\n  }\n\n  matchPageSide(side: string): boolean {\n    switch (side) {\n      case \"left\":\n      case \"right\":\n      case \"recto\":\n      case \"verso\":\n        return new Exprs.Named(this.style.pageScope, `${side}-page`).evaluate(\n          this,\n        ) as boolean;\n      default:\n        return true;\n    }\n  }\n\n  updateStartSide(layoutPosition: Vtree.LayoutPosition) {\n    for (const name in layoutPosition.flowPositions) {\n      const flowPos = layoutPosition.flowPositions[name];\n      if (flowPos && flowPos.positions.length > 0) {\n        const flowChunk = flowPos.positions[0].flowChunk;\n        if (this.getConsumedOffset(flowPos) === flowChunk.startOffset) {\n          const flowChunkBreakBefore =\n            flowPos.positions[0].flowChunk.breakBefore;\n          const flowBreakAfter = Break.startSideValueToBreakValue(\n            flowPos.startSide,\n          );\n          flowPos.startSide = Break.breakValueToStartSideValue(\n            Break.resolveEffectiveBreakValue(\n              flowBreakAfter,\n              flowChunkBreakBefore,\n            ),\n          );\n        }\n      }\n    }\n  }\n\n  /**\n   * @param cascadedPageStyle Cascaded page style specified in page context\n   */\n  selectPageMaster(\n    cascadedPageStyle: CssCascade.ElementStyle,\n  ): PageMaster.PageMasterInstance {\n    const self = this;\n    const cp = this.currentLayoutPosition;\n\n    // 3.5. Page Layout Processing Model\n    // 1. Determine current position in the document: Find the minimal\n    // consumed-offset for all elements not fully-consumed in each primary flow.\n    // Current position is maximum of the results among all primary flows.\n    const currentPosition = this.getPosition(cp);\n    if (currentPosition == Number.POSITIVE_INFINITY) {\n      // end of primary content is reached\n      return null;\n    }\n\n    // 2. Page master selection: for each page master:\n    const pageMasters = this.rootPageBoxInstance\n      .children as PageMaster.PageMasterInstance[];\n    let pageMaster: PageMaster.PageMasterInstance;\n    for (let i = 0; i < pageMasters.length; i++) {\n      pageMaster = pageMasters[i];\n\n      // Skip a page master generated for @page rules\n      if (pageMaster.pageBox.pseudoName === CssPage.pageRuleMasterPseudoName) {\n        continue;\n      }\n      let coeff = 1;\n\n      // A. Calculate lookup position using current position and utilization\n      // (see -epubx-utilization property)\n      const utilization = pageMaster.getProp(self, \"utilization\");\n      if (utilization && utilization.isNum()) {\n        coeff = (utilization as Css.Num).num;\n      }\n      const em = self.queryUnitSize(\"em\", false);\n      const pageArea = self.pageWidth() * self.pageHeight();\n      const lookup = Math.ceil((coeff * pageArea) / (em * em));\n\n      // B. Determine element eligibility. Each element in a flow is considered\n      // eligible if it is is not marked as fully consumed and it comes in the\n      // document before the lookup position. Feed lookupOffset and flow\n      // availability into the context\n      this.lookupOffset = this.styler.styleUntil(currentPosition, lookup);\n      Asserts.assert(cp);\n      this.updateStartSide(cp);\n\n      // update layoutPositionAtPageStart since startSide of FlowChunks may be\n      // updated\n      this.layoutPositionAtPageStart = cp.clone();\n      this.initLingering();\n      self.clearScope(this.style.pageScope);\n\n      // C. Determine content availability. Flow has content available if it\n      // contains eligible elements. D. Determine if page master is enabled\n      // using rules in Section 3.4.7\n      const enabled = pageMaster.getProp(self, \"enabled\");\n\n      // E. First enabled page master is used for the next page\n      if (!enabled || enabled === Css.ident._true) {\n        if (VIVLIOSTYLE_DEBUG) {\n          this.dumpLocation(currentPosition);\n        }\n\n        // Apply @page rules\n        return this.pageManager.getPageRulePageMaster(\n          pageMaster,\n          cascadedPageStyle,\n        );\n      }\n    }\n    throw new Error(\"No enabled page masters\");\n  }\n\n  flowChunkIsAfterParentFlowForcedBreak(flowChunk: Vtree.FlowChunk): boolean {\n    const flows = this.layoutPositionAtPageStart.flows;\n    const parentFlowName = flows[flowChunk.flowName].parentFlowName;\n    if (parentFlowName) {\n      const startOffset = flowChunk.startOffset;\n      const forcedBreakOffsets = flows[parentFlowName].forcedBreakOffsets;\n      if (!forcedBreakOffsets.length || startOffset < forcedBreakOffsets[0]) {\n        return false;\n      }\n      const breakOffsetBeforeStartIndex =\n        Base.binarySearch(\n          forcedBreakOffsets.length,\n          (i) => forcedBreakOffsets[i] > startOffset,\n        ) - 1;\n      const breakOffsetBeforeStart =\n        forcedBreakOffsets[breakOffsetBeforeStartIndex];\n      const parentFlowPosition = this.layoutPositionAtPageStart.flowPositions[\n        parentFlowName\n      ];\n      const parentStartOffset = this.getConsumedOffset(parentFlowPosition);\n      if (breakOffsetBeforeStart < parentStartOffset) {\n        return false;\n      }\n      if (parentStartOffset < breakOffsetBeforeStart) {\n        return true;\n      }\n\n      // Special case: parentStartOffset === breakOffsetBeforeStart\n      // In this case, the flowChunk can be used if the start side of the parent\n      // flow matches the current page side.\n      return !this.matchPageSide(parentFlowPosition.startSide);\n    }\n    return false;\n  }\n\n  setFormattingContextToColumn(column: LayoutType.Column, flowName: string) {\n    const flow = this.currentLayoutPosition.flows[flowName];\n    if (!flow.formattingContext) {\n      flow.formattingContext = new LayoutProcessor.BlockFormattingContext(null);\n    }\n    column.flowRootFormattingContext = flow.formattingContext;\n  }\n\n  layoutDeferredPageFloats(column: LayoutType.Column): Task.Result<boolean> {\n    const pageFloatLayoutContext = column.pageFloatLayoutContext;\n    const deferredFloats = pageFloatLayoutContext.getDeferredPageFloatContinuations();\n    const frame = Task.newFrame<boolean>(\"layoutDeferredPageFloats\");\n    let invalidated = false;\n    let i = 0;\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (i === deferredFloats.length) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const continuation = deferredFloats[i++];\n        const float = continuation.float;\n        const strategy = new PageFloats.PageFloatLayoutStrategyResolver().findByFloat(\n          float,\n        );\n        const pageFloatFragment = strategy.findPageFloatFragment(\n          float,\n          pageFloatLayoutContext,\n        );\n        if (pageFloatFragment && pageFloatFragment.hasFloat(float)) {\n          loopFrame.continueLoop();\n          return;\n        } else if (\n          pageFloatLayoutContext.isForbidden(float) ||\n          pageFloatLayoutContext.hasPrecedingFloatsDeferredToNext(float)\n        ) {\n          pageFloatLayoutContext.deferPageFloat(continuation);\n          loopFrame.breakLoop();\n          return;\n        }\n        column\n          .layoutPageFloatInner(continuation, strategy, null, pageFloatFragment)\n          .then((success) => {\n            if (!success) {\n              loopFrame.breakLoop();\n              return;\n            }\n            const parentInvalidated = pageFloatLayoutContext.parent.isInvalidated();\n            if (parentInvalidated) {\n              loopFrame.breakLoop();\n              return;\n            } else if (\n              pageFloatLayoutContext.isInvalidated() &&\n              !parentInvalidated\n            ) {\n              invalidated = true;\n              pageFloatLayoutContext.validate();\n            }\n            loopFrame.continueLoop();\n          });\n      })\n      .then(() => {\n        if (invalidated) {\n          pageFloatLayoutContext.invalidate();\n        }\n        frame.finish(true);\n      });\n    return frame.result();\n  }\n\n  getLastAfterPositionIfDeferredFloatsExists(\n    column: LayoutType.Column,\n    newPosition: Vtree.ChunkPosition | null,\n  ): Vtree.ChunkPosition | null {\n    const pageFloatLayoutContext = column.pageFloatLayoutContext;\n    const deferredFloats = pageFloatLayoutContext.getPageFloatContinuationsDeferredToNext();\n    if (deferredFloats.length > 0) {\n      if (column.lastAfterPosition) {\n        let result: Vtree.ChunkPosition;\n        if (newPosition) {\n          // Need overflown footnotes owned by newPosition\n          result = newPosition.clone();\n          result.primary = column.lastAfterPosition;\n        } else {\n          result = new Vtree.ChunkPosition(column.lastAfterPosition);\n        }\n        return result;\n      } else {\n        Asserts.assert(\"column.lastAfterPosition === null\");\n        return null;\n      }\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * @return holding true\n   */\n  layoutColumn(\n    column: LayoutType.Column,\n    flowName: string,\n  ): Task.Result<boolean> {\n    const flowPosition = this.currentLayoutPosition.flowPositions[flowName];\n    if (!flowPosition || !this.matchPageSide(flowPosition.startSide)) {\n      return Task.newResult(true);\n    }\n    flowPosition.startSide = \"any\";\n    this.setFormattingContextToColumn(column, flowName);\n    column.init();\n    if (this.primaryFlows[flowName] && column.bands.length > 0) {\n      // In general, we force non-fitting content. Exception is only for primary\n      // flow columns that have exclusions.\n      column.forceNonfitting = false;\n    }\n    const self = this;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"layoutColumn\");\n    this.layoutDeferredPageFloats(column).then(() => {\n      if (column.pageFloatLayoutContext.isInvalidated()) {\n        frame.finish(true);\n        return;\n      }\n\n      // Record indices of repeated positions and removed positions\n      const repeatedIndices = [] as number[];\n      const removedIndices = [] as number[];\n      let leadingEdge = true;\n      frame\n        .loopWithFrame((loopFrame) => {\n          if (\n            column.pageFloatLayoutContext.hasContinuingFloatFragmentsInFlow(\n              flowName,\n            )\n          ) {\n            loopFrame.breakLoop();\n            return;\n          }\n          while (flowPosition.positions.length - removedIndices.length > 0) {\n            let index = 0;\n\n            // Skip all removed positions\n            while (removedIndices.includes(index)) {\n              index++;\n            }\n            let selected = flowPosition.positions[index];\n            if (\n              selected.flowChunk.startOffset > self.lookupOffset ||\n              self.flowChunkIsAfterParentFlowForcedBreak(selected.flowChunk)\n            ) {\n              break;\n            }\n            for (let k = index + 1; k < flowPosition.positions.length; k++) {\n              if (removedIndices.includes(k)) {\n                continue; // Skip removed positions\n              }\n              const alt = flowPosition.positions[k];\n              if (\n                alt.flowChunk.startOffset > self.lookupOffset ||\n                self.flowChunkIsAfterParentFlowForcedBreak(alt.flowChunk)\n              ) {\n                break;\n              }\n              if (alt.flowChunk.isBetter(selected.flowChunk)) {\n                selected = alt;\n                index = k;\n              }\n            }\n            const flowChunk = selected.flowChunk;\n            let pending = true;\n            column\n              .layout(\n                selected.chunkPosition,\n                leadingEdge,\n                flowPosition.breakAfter,\n              )\n              .then((newPosition) => {\n                if (column.pageFloatLayoutContext.isInvalidated()) {\n                  loopFrame.breakLoop();\n                  return;\n                }\n                leadingEdge = false;\n\n                // static: keep in the flow\n                if (\n                  selected.flowChunk.repeated &&\n                  (newPosition === null || flowChunk.exclusive)\n                ) {\n                  repeatedIndices.push(index);\n                }\n                if (flowChunk.exclusive) {\n                  // exclusive, only can have one, remove from the flow even\n                  // if it did not fit\n                  removedIndices.push(index);\n                  loopFrame.breakLoop();\n                  return;\n                } else {\n                  // not exclusive\n                  const endOfColumn = !!newPosition || !!column.pageBreakType;\n                  const lastAfterPosition = self.getLastAfterPositionIfDeferredFloatsExists(\n                    column,\n                    newPosition,\n                  );\n                  if (column.pageBreakType && lastAfterPosition) {\n                    selected.chunkPosition = lastAfterPosition;\n\n                    // TODO propagate pageBreakType\n                    flowPosition.breakAfter = column.pageBreakType;\n                    column.pageBreakType = null;\n                  } else {\n                    // go to the next element in the flow\n                    removedIndices.push(index);\n                    if (newPosition || lastAfterPosition) {\n                      // did not fit completely\n                      selected.chunkPosition = newPosition || lastAfterPosition;\n                      repeatedIndices.push(index);\n                    }\n                    if (column.pageBreakType) {\n                      // forced break\n                      flowPosition.startSide = Break.breakValueToStartSideValue(\n                        column.pageBreakType,\n                      );\n                    }\n                  }\n                  if (endOfColumn) {\n                    loopFrame.breakLoop();\n                    return;\n                  }\n                }\n\n                // Since at least one flowChunk has been placed in the\n                // column, the next flowChunk of the flow can be deferred to\n                // the next partition if there is not enough space in the\n                // current partition.\n                column.forceNonfitting = false;\n                if (pending) {\n                  // Sync result\n                  pending = false;\n                } else {\n                  // Async result\n                  loopFrame.continueLoop();\n                }\n              });\n            if (pending) {\n              // Async result\n              pending = false;\n              return;\n            }\n          }\n\n          // Sync result\n          loopFrame.breakLoop();\n        })\n        .then(() => {\n          if (!column.pageFloatLayoutContext.isInvalidated()) {\n            // Keep positions repeated or not removed\n            flowPosition.positions = flowPosition.positions.filter(\n              (pos, i) =>\n                repeatedIndices.includes(i) || !removedIndices.includes(i),\n            );\n            if (flowPosition.breakAfter === \"column\") {\n              flowPosition.breakAfter = null;\n            }\n            column.saveDistanceToBlockEndFloats();\n            const edge = column.pageFloatLayoutContext.getMaxReachedAfterEdge();\n            column.updateMaxReachedAfterEdge(edge);\n          }\n          frame.finish(true);\n        });\n    });\n    return frame.result();\n  }\n\n  createLayoutConstraint(\n    pageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ): LayoutType.LayoutConstraint {\n    const pageIndex = this.currentLayoutPosition.page - 1;\n    const counterConstraint = this.counterStore.createLayoutConstraint(\n      pageIndex,\n    );\n    return new Layout.AllLayoutConstraint(\n      [counterConstraint].concat(pageFloatLayoutContext.getLayoutConstraints()),\n    );\n  }\n\n  private createAndLayoutColumn(\n    boxInstance: PageMaster.PageBoxInstance,\n    offsetX: number,\n    offsetY: number,\n    exclusions: GeometryUtil.Shape[],\n    layoutContainer: Vtree.Container,\n    currentColumnIndex: number,\n    flowNameStr: string,\n    regionPageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    columnCount: number,\n    columnGap: number,\n    columnWidth: number,\n    innerShape: GeometryUtil.Shape,\n    layoutContext: Vtree.LayoutContext,\n    forceNonFitting: boolean,\n  ): Task.Result<LayoutType.Column> {\n    const self = this;\n    const dontApplyExclusions = boxInstance.vertical\n      ? boxInstance.isAutoWidth && boxInstance.isRightDependentOnAutoWidth\n      : boxInstance.isAutoHeight && boxInstance.isTopDependentOnAutoHeight;\n    const boxContainer = layoutContainer.element;\n    const columnPageFloatLayoutContext = new PageFloats.PageFloatLayoutContext(\n      regionPageFloatLayoutContext,\n      PageFloats.FloatReference.COLUMN,\n      null,\n      flowNameStr,\n      null,\n      null,\n      null,\n    );\n    const positionAtColumnStart = self.currentLayoutPosition.clone();\n    const frame: Task.Frame<LayoutType.Column> = Task.newFrame(\n      \"createAndLayoutColumn\",\n    );\n    let column: LayoutType.Column;\n    frame\n      .loopWithFrame((loopFrame) => {\n        const layoutConstraint = self.createLayoutConstraint(\n          columnPageFloatLayoutContext,\n        );\n        if (columnCount > 1) {\n          const columnContainer = self.viewport.document.createElement(\"div\");\n          Base.setCSSProperty(columnContainer, \"position\", \"absolute\");\n          boxContainer.appendChild(columnContainer);\n          column = new Layout.Column(\n            columnContainer,\n            layoutContext,\n            self.clientLayout,\n            layoutConstraint,\n            columnPageFloatLayoutContext,\n          );\n          column.forceNonfitting = forceNonFitting;\n          column.vertical = layoutContainer.vertical;\n          column.snapHeight = layoutContainer.snapHeight;\n          column.snapWidth = layoutContainer.snapWidth;\n          if (layoutContainer.vertical) {\n            const columnY =\n              currentColumnIndex * (columnWidth + columnGap) +\n              layoutContainer.paddingTop;\n            column.setHorizontalPosition(\n              layoutContainer.paddingLeft,\n              layoutContainer.width,\n            );\n            column.setVerticalPosition(columnY, columnWidth);\n          } else {\n            const columnX =\n              currentColumnIndex * (columnWidth + columnGap) +\n              layoutContainer.paddingLeft;\n            column.setVerticalPosition(\n              layoutContainer.paddingTop,\n              layoutContainer.height,\n            );\n            column.setHorizontalPosition(columnX, columnWidth);\n          }\n          column.originX = offsetX;\n          column.originY = offsetY;\n        } else {\n          column = new Layout.Column(\n            boxContainer,\n            layoutContext,\n            self.clientLayout,\n            layoutConstraint,\n            columnPageFloatLayoutContext,\n          );\n          column.copyFrom(layoutContainer);\n        }\n        column.exclusions = dontApplyExclusions ? [] : exclusions.concat();\n        column.innerShape = innerShape;\n        columnPageFloatLayoutContext.setContainer(column);\n        if (column.width >= 0) {\n          // column.element.style.outline = \"1px dotted green\";\n          self.layoutColumn(column, flowNameStr).then(() => {\n            if (!columnPageFloatLayoutContext.isInvalidated()) {\n              columnPageFloatLayoutContext.finish();\n            }\n            if (\n              column.pageFloatLayoutContext.isInvalidated() &&\n              !regionPageFloatLayoutContext.isInvalidated()\n            ) {\n              column.pageFloatLayoutContext.validate();\n              self.currentLayoutPosition = positionAtColumnStart.clone();\n              if (column.element !== boxContainer) {\n                boxContainer.removeChild(column.element);\n              }\n              loopFrame.continueLoop();\n            } else {\n              loopFrame.breakLoop();\n            }\n          });\n        } else {\n          columnPageFloatLayoutContext.finish();\n          loopFrame.breakLoop();\n        }\n      })\n      .then(() => {\n        frame.finish(column);\n      });\n    return frame.result();\n  }\n\n  setPagePageFloatLayoutContextContainer(\n    pagePageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    boxInstance: PageMaster.PageBoxInstance,\n    layoutContainer: Vtree.Container,\n  ) {\n    if (\n      boxInstance instanceof CssPage.PageRulePartitionInstance ||\n      (boxInstance instanceof PageMaster.PageMasterInstance &&\n        !(boxInstance instanceof CssPage.PageRuleMasterInstance))\n    ) {\n      pagePageFloatLayoutContext.setContainer(layoutContainer);\n    }\n  }\n\n  getRegionPageFloatLayoutContext(\n    pagePageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    boxInstance: PageMaster.PageBoxInstance,\n    layoutContainer: Vtree.Container,\n    flowName: string,\n  ): PageFloats.PageFloatLayoutContext {\n    Asserts.assert(boxInstance instanceof PageMaster.PartitionInstance);\n    const writingMode = boxInstance.getProp(this, \"writing-mode\") || null;\n    const direction = boxInstance.getProp(this, \"direction\") || null;\n    return new PageFloats.PageFloatLayoutContext(\n      pagePageFloatLayoutContext,\n      PageFloats.FloatReference.REGION,\n      layoutContainer,\n      flowName,\n      null,\n      writingMode,\n      direction,\n    );\n  }\n\n  layoutFlowColumnsWithBalancing(\n    page: Vtree.Page,\n    boxInstance: PageMaster.PageBoxInstance,\n    offsetX: number,\n    offsetY: number,\n    exclusions: GeometryUtil.Shape[],\n    pagePageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    layoutContainer: Vtree.Container,\n    flowNameStr: string,\n    columnCount: number,\n  ): Task.Result<LayoutType.Column[]> {\n    const self = this;\n    const positionAtContainerStart = self.currentLayoutPosition.clone();\n    const regionPageFloatLayoutContext = self.getRegionPageFloatLayoutContext(\n      pagePageFloatLayoutContext,\n      boxInstance,\n      layoutContainer,\n      flowNameStr,\n    );\n    let isFirstTime = true;\n\n    function layoutColumns() {\n      self.currentLayoutPosition = positionAtContainerStart.clone();\n      return self\n        .layoutFlowColumns(\n          page,\n          boxInstance,\n          offsetX,\n          offsetY,\n          exclusions,\n          pagePageFloatLayoutContext,\n          regionPageFloatLayoutContext,\n          layoutContainer,\n          flowNameStr,\n          columnCount,\n          isFirstTime,\n        )\n        .thenAsync((columns) => {\n          if (columns) {\n            return Task.newResult({\n              columns,\n              position: self.currentLayoutPosition,\n            });\n          } else {\n            return Task.newResult(null);\n          }\n        });\n    }\n    return layoutColumns().thenAsync((generatorResult) => {\n      if (!generatorResult) {\n        return Task.newResult(null);\n      }\n      if (columnCount <= 1) {\n        return Task.newResult(generatorResult.columns);\n      }\n      const columnFill =\n        (boxInstance.getProp(self, \"column-fill\") as Css.Ident) ||\n        Css.ident.balance;\n      const flowPosition =\n        self.currentLayoutPosition.flowPositions[flowNameStr];\n      Asserts.assert(flowPosition);\n      const columnBalancer = Columns.createColumnBalancer(\n        columnCount,\n        columnFill,\n        layoutColumns,\n        regionPageFloatLayoutContext,\n        layoutContainer,\n        generatorResult.columns,\n        flowPosition,\n      );\n      if (!columnBalancer) {\n        return Task.newResult(generatorResult.columns);\n      }\n      isFirstTime = false;\n      pagePageFloatLayoutContext.lock();\n      regionPageFloatLayoutContext.lock();\n      return columnBalancer\n        .balanceColumns(generatorResult)\n        .thenAsync((result) => {\n          pagePageFloatLayoutContext.unlock();\n          pagePageFloatLayoutContext.validate();\n          regionPageFloatLayoutContext.unlock();\n          self.currentLayoutPosition = result.position;\n          return Task.newResult(result.columns);\n        });\n    });\n  }\n\n  layoutFlowColumns(\n    page: Vtree.Page,\n    boxInstance: PageMaster.PageBoxInstance,\n    offsetX: number,\n    offsetY: number,\n    exclusions: GeometryUtil.Shape[],\n    pagePageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    regionPageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n    layoutContainer: Vtree.Container,\n    flowNameStr: string,\n    columnCount: number,\n    forceNonFitting: boolean,\n  ): Task.Result<LayoutType.Column[] | null> {\n    const self = this;\n    const frame: Task.Frame<LayoutType.Column[] | null> = Task.newFrame(\n      \"layoutFlowColumns\",\n    );\n    const positionAtContainerStart = self.currentLayoutPosition.clone();\n    const columnGap = boxInstance.getPropAsNumber(self, \"column-gap\");\n\n    // Don't query columnWidth when it's not needed, so that width calculation\n    // can be delayed for width: auto columns.\n    const columnWidth =\n      columnCount > 1\n        ? boxInstance.getPropAsNumber(self, \"column-width\")\n        : layoutContainer.width;\n    const regionIds = boxInstance.getActiveRegions(self);\n    const innerShapeVal = boxInstance.getProp(self, \"shape-inside\");\n    const innerShape = CssProp.toShape(\n      innerShapeVal,\n      0,\n      0,\n      layoutContainer.width,\n      layoutContainer.height,\n      self,\n    );\n    const layoutContext = new Vgen.ViewFactory(\n      flowNameStr,\n      self,\n      self.viewport,\n      self.styler,\n      regionIds,\n      self.xmldoc,\n      self.faces,\n      self.style.footnoteProps,\n      self,\n      page,\n      self.customRenderer,\n      self.fallbackMap,\n      this.documentURLTransformer,\n    );\n    let columnIndex = 0;\n    let column: LayoutType.Column = null;\n    let columns: LayoutType.Column[] = [];\n    frame\n      .loopWithFrame((loopFrame) => {\n        self\n          .createAndLayoutColumn(\n            boxInstance,\n            offsetX,\n            offsetY,\n            exclusions,\n            layoutContainer,\n            columnIndex++,\n            flowNameStr,\n            regionPageFloatLayoutContext,\n            columnCount,\n            columnGap,\n            columnWidth,\n            innerShape,\n            layoutContext,\n            forceNonFitting,\n          )\n          .then((c) => {\n            if (pagePageFloatLayoutContext.isInvalidated()) {\n              columns = null;\n              loopFrame.breakLoop();\n              return;\n            }\n            const forcedRegionBreak =\n              !!c.pageBreakType && c.pageBreakType !== \"column\";\n            if (\n              (forcedRegionBreak || columnIndex === columnCount) &&\n              !regionPageFloatLayoutContext.isInvalidated()\n            ) {\n              regionPageFloatLayoutContext.finish();\n            }\n            if (regionPageFloatLayoutContext.isInvalidated()) {\n              columnIndex = 0;\n              self.currentLayoutPosition = positionAtContainerStart.clone();\n              regionPageFloatLayoutContext.validate();\n              if (regionPageFloatLayoutContext.isLocked()) {\n                columns = null;\n                loopFrame.breakLoop();\n              } else {\n                loopFrame.continueLoop();\n              }\n              return;\n            }\n            column = c;\n            columns[columnIndex - 1] = column;\n            if (column.pageBreakType) {\n              if (column.pageBreakType != \"column\") {\n                // skip remaining columns\n                columnIndex = columnCount;\n                if (column.pageBreakType != \"region\") {\n                  // skip remaining regions\n                  self.pageBreaks[flowNameStr] = true;\n                }\n              }\n            }\n            if (columnIndex < columnCount) {\n              loopFrame.continueLoop();\n            } else {\n              loopFrame.breakLoop();\n            }\n          });\n      })\n      .then(() => {\n        frame.finish(columns);\n      });\n    return frame.result();\n  }\n\n  /**\n   * @return holding true\n   */\n  layoutContainer(\n    page: Vtree.Page,\n    boxInstance: PageMaster.PageBoxInstance,\n    parentContainer: HTMLElement,\n    offsetX: number,\n    offsetY: number,\n    exclusions: GeometryUtil.Shape[],\n    pagePageFloatLayoutContext: PageFloats.PageFloatLayoutContext,\n  ): Task.Result<boolean> {\n    const self = this;\n    boxInstance.reset();\n    const enabled = boxInstance.getProp(self, \"enabled\");\n    if (enabled && enabled !== Css.ident._true) {\n      return Task.newResult(true);\n    }\n    const frame: Task.Frame<boolean> = Task.newFrame(\"layoutContainer\");\n    const wrapFlow = boxInstance.getProp(self, \"wrap-flow\");\n    const dontExclude = wrapFlow === Css.ident.auto;\n    const flowName = boxInstance.getProp(self, \"flow-from\");\n    const boxContainer = self.viewport.document.createElement(\"div\");\n    const position = boxInstance.getProp(self, \"position\");\n    Base.setCSSProperty(\n      boxContainer,\n      \"position\",\n      position ? (position as any).name : \"absolute\",\n    );\n    parentContainer.insertBefore(boxContainer, parentContainer.firstChild);\n    let layoutContainer = new Vtree.Container(boxContainer);\n    layoutContainer.vertical = boxInstance.vertical;\n    layoutContainer.exclusions = exclusions;\n    boxInstance.prepareContainer(\n      self,\n      layoutContainer,\n      page,\n      self.faces,\n      self.clientLayout,\n    );\n    layoutContainer.originX = offsetX;\n    layoutContainer.originY = offsetY;\n    offsetX +=\n      layoutContainer.left +\n      layoutContainer.marginLeft +\n      layoutContainer.borderLeft;\n    offsetY +=\n      layoutContainer.top +\n      layoutContainer.marginTop +\n      layoutContainer.borderTop;\n    this.setPagePageFloatLayoutContextContainer(\n      pagePageFloatLayoutContext,\n      boxInstance,\n      layoutContainer,\n    );\n    let cont: Task.Result<boolean>;\n    let removed = false;\n    if (!flowName || !flowName.isIdent()) {\n      const contentVal = boxInstance.getProp(self, \"content\");\n      if (contentVal && Vtree.nonTrivialContent(contentVal)) {\n        let innerContainerTag = \"span\";\n        if ((contentVal as any).url) {\n          innerContainerTag = \"img\";\n        }\n        const innerContainer = self.viewport.document.createElement(\n          innerContainerTag,\n        );\n        contentVal.visit(\n          new Vtree.ContentPropertyHandler(\n            innerContainer,\n            self,\n            contentVal,\n            self.counterStore.getExprContentListener(),\n          ),\n        );\n        boxContainer.appendChild(innerContainer);\n        if (innerContainerTag == \"img\") {\n          boxInstance.transferSinglUriContentProps(\n            self,\n            innerContainer,\n            self.faces,\n          );\n        }\n        boxInstance.transferContentProps(\n          self,\n          layoutContainer,\n          page,\n          self.faces,\n        );\n      } else if (boxInstance.suppressEmptyBoxGeneration) {\n        parentContainer.removeChild(boxContainer);\n        removed = true;\n      }\n      if (!removed) {\n        boxInstance.finishContainer(\n          self,\n          layoutContainer,\n          page,\n          null,\n          1,\n          self.clientLayout,\n          self.faces,\n        );\n      }\n      cont = Task.newResult(true);\n    } else if (!self.pageBreaks[flowName.toString()]) {\n      const innerFrame: Task.Frame<boolean> = Task.newFrame(\n        \"layoutContainer.inner\",\n      );\n      const flowNameStr = flowName.toString();\n\n      // for now only a single column in vertical case\n      const columnCount = boxInstance.getPropAsNumber(self, \"column-count\");\n      self\n        .layoutFlowColumnsWithBalancing(\n          page,\n          boxInstance,\n          offsetX,\n          offsetY,\n          exclusions,\n          pagePageFloatLayoutContext,\n          layoutContainer,\n          flowNameStr,\n          columnCount,\n        )\n        .then((columns) => {\n          if (!pagePageFloatLayoutContext.isInvalidated()) {\n            const column = columns[0];\n            Asserts.assert(column);\n            if (column.element === boxContainer) {\n              layoutContainer = column;\n            }\n            layoutContainer.computedBlockSize = Math.max.apply(\n              null,\n              columns.map((c) => c.computedBlockSize),\n            );\n            boxInstance.finishContainer(\n              self,\n              layoutContainer,\n              page,\n              column,\n              columnCount,\n              self.clientLayout,\n              self.faces,\n            );\n            const flowPosition =\n              self.currentLayoutPosition.flowPositions[flowNameStr];\n            if (flowPosition && flowPosition.breakAfter === \"region\") {\n              flowPosition.breakAfter = null;\n            }\n          }\n          innerFrame.finish(true);\n        });\n      cont = innerFrame.result();\n    } else {\n      if (!pagePageFloatLayoutContext.isInvalidated()) {\n        boxInstance.finishContainer(\n          self,\n          layoutContainer,\n          page,\n          null,\n          1,\n          self.clientLayout,\n          self.faces,\n        );\n      }\n      cont = Task.newResult(true);\n    }\n    cont.then(() => {\n      if (pagePageFloatLayoutContext.isInvalidated()) {\n        frame.finish(true);\n        return;\n      }\n      if (\n        !boxInstance.isAutoHeight ||\n        Math.floor(layoutContainer.computedBlockSize) > 0\n      ) {\n        if (!removed && !dontExclude) {\n          const outerShapeProp = boxInstance.getProp(self, \"shape-outside\");\n          const outerShape = layoutContainer.getOuterShape(\n            outerShapeProp,\n            self,\n          );\n\n          // Though it seems that LShapeFloatBug still exists in Firefox, it\n          // apparently does not occur on exclusion floats. See the test file:\n          // test/files/column-break-bug.html\n          // if (Base.checkLShapeFloatBug(self.viewport.root)) {\n          // \t// Simplistic bug workaround: add a copy of the shape translated up.\n          //     exclusions.push(outerShape.withOffset(0, -1.25 * self.queryUnitSize(\"em\", false)));\n          // }\n          exclusions.push(outerShape);\n        }\n      } else if (boxInstance.children.length == 0) {\n        parentContainer.removeChild(boxContainer);\n        frame.finish(true);\n        return;\n      }\n      let i = boxInstance.children.length - 1;\n      frame\n        .loop(() => {\n          while (i >= 0) {\n            const child = boxInstance.children[i--];\n            const r = self.layoutContainer(\n              page,\n              child,\n              boxContainer as HTMLElement,\n              offsetX,\n              offsetY,\n              exclusions,\n              pagePageFloatLayoutContext,\n            );\n            if (r.isPending()) {\n              return r.thenAsync(() =>\n                Task.newResult(!pagePageFloatLayoutContext.isInvalidated()),\n              );\n            } else if (pagePageFloatLayoutContext.isInvalidated()) {\n              break;\n            }\n          }\n          return Task.newResult(false);\n        })\n        .then(() => {\n          frame.finish(true);\n        });\n    });\n    return frame.result();\n  }\n\n  processLinger(): void {\n    const pageNumber = this.currentLayoutPosition.page;\n    for (const flowName in this.currentLayoutPosition.flowPositions) {\n      const flowPosition = this.currentLayoutPosition.flowPositions[flowName];\n      for (let i = flowPosition.positions.length - 1; i >= 0; i--) {\n        const pos = flowPosition.positions[i];\n        if (\n          pos.flowChunk.startPage >= 0 &&\n          pos.flowChunk.startPage + pos.flowChunk.linger - 1 <= pageNumber\n        ) {\n          flowPosition.positions.splice(i, 1);\n        }\n      }\n    }\n  }\n\n  initLingering(): void {\n    const pageNumber = this.currentLayoutPosition.page;\n    for (const flowName in this.currentLayoutPosition.flowPositions) {\n      const flowPosition = this.currentLayoutPosition.flowPositions[flowName];\n      for (let i = flowPosition.positions.length - 1; i >= 0; i--) {\n        const pos = flowPosition.positions[i];\n        if (\n          pos.flowChunk.startPage < 0 &&\n          pos.flowChunk.startOffset < this.lookupOffset\n        ) {\n          pos.flowChunk.startPage = pageNumber;\n        }\n      }\n    }\n  }\n\n  noMorePrimaryFlows(cp: Vtree.LayoutPosition): boolean {\n    for (const flowName in this.primaryFlows) {\n      const flowPosition = cp.flowPositions[flowName];\n      if (flowPosition && flowPosition.positions.length > 0) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  layoutNextPage(\n    page: Vtree.Page,\n    cp?: Vtree.LayoutPosition,\n  ): Task.Result<Vtree.LayoutPosition> {\n    const self = this;\n\n    // TOC box is special page container, no pagination\n    const isTocBox = page.container === page.bleedBox;\n\n    self.pageBreaks = {};\n    if (cp) {\n      self.currentLayoutPosition = cp.clone();\n      self.styler.replayFlowElementsFromOffset(cp.highestSeenOffset);\n    } else {\n      self.currentLayoutPosition = new Vtree.LayoutPosition();\n      self.styler.replayFlowElementsFromOffset(-1);\n    }\n    if (this.lang) {\n      page.bleedBox.setAttribute(\"lang\", this.lang);\n    }\n    cp = self.currentLayoutPosition;\n    cp.page++;\n    self.clearScope(self.style.pageScope);\n    self.layoutPositionAtPageStart = cp.clone();\n\n    // Resolve page size before page master selection.\n    const cascadedPageStyle = isTocBox\n      ? ({} as CssCascade.ElementStyle)\n      : self.pageManager.getCascadedPageStyle();\n    const pageMaster = self.selectPageMaster(cascadedPageStyle);\n    if (!pageMaster) {\n      // end of primary content\n      return Task.newResult(null as Vtree.LayoutPosition);\n    }\n    let bleedBoxPaddingEdge = 0;\n    if (!isTocBox) {\n      page.setAutoPageWidth(\n        pageMaster.pageBox.specified[\"width\"].value === Css.fullWidth,\n      );\n      page.setAutoPageHeight(\n        pageMaster.pageBox.specified[\"height\"].value === Css.fullHeight,\n      );\n      self.counterStore.setCurrentPage(page);\n      self.counterStore.updatePageCounters(cascadedPageStyle, self);\n\n      // setup bleed area and crop marks\n      const evaluatedPageSizeAndBleed = CssPage.evaluatePageSizeAndBleed(\n        CssPage.resolvePageSizeAndBleed(cascadedPageStyle as any),\n        this,\n      );\n      self.setPageSizeAndBleed(evaluatedPageSizeAndBleed, page);\n      CssPage.addPrinterMarks(\n        cascadedPageStyle,\n        evaluatedPageSizeAndBleed,\n        page,\n        this,\n      );\n      bleedBoxPaddingEdge =\n        evaluatedPageSizeAndBleed.bleedOffset + evaluatedPageSizeAndBleed.bleed;\n    }\n\n    const writingMode =\n      (!isTocBox && pageMaster.getProp(self, \"writing-mode\")) ||\n      Css.ident.horizontal_tb;\n\n    this.pageVertical = writingMode != Css.ident.horizontal_tb;\n\n    const direction = pageMaster.getProp(self, \"direction\") || Css.ident.ltr;\n    const pageFloatLayoutContext = new PageFloats.PageFloatLayoutContext(\n      self.rootPageFloatLayoutContext,\n      PageFloats.FloatReference.PAGE,\n      null,\n      null,\n      null,\n      writingMode,\n      direction,\n    );\n    const frame: Task.Frame<Vtree.LayoutPosition> = Task.newFrame(\n      \"layoutNextPage\",\n    );\n    frame\n      .loopWithFrame((loopFrame) => {\n        // self.layoutContainer(page, pageMaster, page.bleedBox, bleedBoxPaddingEdge, bleedBoxPaddingEdge+1, // Compensate 'top: -1px' on page master\n        self\n          .layoutContainer(\n            page,\n            pageMaster,\n            page.bleedBox,\n            bleedBoxPaddingEdge,\n            bleedBoxPaddingEdge,\n            [],\n            pageFloatLayoutContext,\n          )\n          .then(() => {\n            if (!pageFloatLayoutContext.isInvalidated()) {\n              pageFloatLayoutContext.finish();\n            }\n            if (pageFloatLayoutContext.isInvalidated()) {\n              self.currentLayoutPosition = self.layoutPositionAtPageStart.clone();\n              pageFloatLayoutContext.validate();\n              loopFrame.continueLoop();\n            } else {\n              loopFrame.breakLoop();\n            }\n          });\n      })\n      .then(() => {\n        pageMaster.adjustPageLayout(self, page, self.clientLayout);\n        if (!isTocBox) {\n          const isLeftPage = new Exprs.Named(\n            pageMaster.pageBox.scope,\n            \"left-page\",\n          );\n          page.side = isLeftPage.evaluate(self)\n            ? Constants.PageSide.LEFT\n            : Constants.PageSide.RIGHT;\n          self.processLinger();\n          cp = self.currentLayoutPosition;\n          Object.keys(cp.flowPositions).forEach((flowName) => {\n            const flowPosition = cp.flowPositions[flowName];\n            const breakAfter = flowPosition.breakAfter;\n            if (\n              breakAfter &&\n              (breakAfter === \"page\" || !self.matchPageSide(breakAfter))\n            ) {\n              flowPosition.breakAfter = null;\n            }\n          });\n        }\n        self.currentLayoutPosition = self.layoutPositionAtPageStart = null;\n        cp.highestSeenOffset = self.styler.getReachedOffset();\n        const triggers = self.style.store.getTriggersForDoc(self.xmldoc);\n        page.finish(triggers, self.clientLayout);\n        if (self.noMorePrimaryFlows(cp)) {\n          cp = null;\n        }\n        frame.finish(cp);\n      });\n    return frame.result();\n  }\n\n  /**\n   * Set actual page width, height and bleed from style specified in page\n   * context.\n   */\n  private setPageSizeAndBleed(\n    evaluatedPageSizeAndBleed: CssPage.EvaluatedPageSizeAndBleed,\n    page: Vtree.Page,\n  ) {\n    this.actualPageWidth = evaluatedPageSizeAndBleed.pageWidth;\n    this.actualPageHeight = evaluatedPageSizeAndBleed.pageHeight;\n    this.pageSheetWidth =\n      evaluatedPageSizeAndBleed.pageWidth +\n      evaluatedPageSizeAndBleed.cropOffset * 2;\n    this.pageSheetHeight =\n      evaluatedPageSizeAndBleed.pageHeight +\n      evaluatedPageSizeAndBleed.cropOffset * 2;\n    page.container.style.width = `${this.pageSheetWidth}px`;\n    page.container.style.height = `${this.pageSheetHeight}px`;\n    page.bleedBox.style.left = `${evaluatedPageSizeAndBleed.bleedOffset}px`;\n    page.bleedBox.style.right = `${evaluatedPageSizeAndBleed.bleedOffset}px`;\n    page.bleedBox.style.top = `${evaluatedPageSizeAndBleed.bleedOffset}px`;\n    page.bleedBox.style.bottom = `${evaluatedPageSizeAndBleed.bleedOffset}px`;\n    page.bleedBox.style.padding = `${evaluatedPageSizeAndBleed.bleed}px`;\n\n    // Shift 1px to workaround Chrome printing bug (Canceled because of another Chrome problem)\n    // page.bleedBox.style.paddingTop = `${evaluatedPageSizeAndBleed.bleed+1}px`;\n\n    // Shift 0.01px to workaround Firefox printing problem\n    // (This small value (< 1/64 px) has no effect to Chrome)\n    page.bleedBox.style.paddingTop = `${evaluatedPageSizeAndBleed.bleed +\n      0.01}px`;\n  }\n}\n\nexport class BaseParserHandler extends CssCascade.CascadeParserHandler {\n  insideRegion: boolean = false;\n\n  constructor(\n    public masterHandler: StyleParserHandler,\n    condition: Exprs.Val,\n    parent: BaseParserHandler,\n    regionId: string | null,\n  ) {\n    super(\n      masterHandler.rootScope,\n      masterHandler,\n      condition,\n      parent,\n      regionId,\n      masterHandler.validatorSet,\n      !parent,\n    );\n  }\n\n  /**\n   * @override\n   */\n  startPageTemplateRule(): void {}\n\n  /**\n   * @override\n   */\n  startPageMasterRule(\n    name: string | null,\n    pseudoName: string | null,\n    classes: string[],\n  ): void {\n    const pageMaster = new PageMaster.PageMaster(\n      this.masterHandler.pageScope,\n      name,\n      pseudoName,\n      classes,\n      this.masterHandler.rootBox,\n      this.condition,\n      this.owner.getBaseSpecificity(),\n    );\n    this.masterHandler.pushHandler(\n      new PageMaster.PageMasterParserHandler(\n        pageMaster.scope,\n        this.masterHandler,\n        pageMaster,\n        this.validatorSet,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startWhenRule(expr: Css.Expr): void {\n    let condition = expr.expr;\n    if (this.condition != null) {\n      condition = Exprs.and(this.scope, this.condition, condition);\n    }\n    this.masterHandler.pushHandler(\n      new BaseParserHandler(this.masterHandler, condition, this, this.regionId),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startDefineRule(): void {\n    this.masterHandler.pushHandler(\n      new CssCascade.DefineParserHandler(this.scope, this.owner),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startFontFaceRule(): void {\n    const properties = {} as CssCascade.ElementStyle;\n    this.masterHandler.fontFaces.push({\n      properties,\n      condition: this.condition,\n    });\n    this.masterHandler.pushHandler(\n      new CssCascade.PropSetParserHandler(\n        this.scope,\n        this.owner,\n        null,\n        properties,\n        this.masterHandler.validatorSet,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startFlowRule(flowName: string): void {\n    let style = this.masterHandler.flowProps[flowName];\n    if (!style) {\n      style = {} as CssCascade.ElementStyle;\n      this.masterHandler.flowProps[flowName] = style;\n    }\n    this.masterHandler.pushHandler(\n      new CssCascade.PropSetParserHandler(\n        this.scope,\n        this.owner,\n        null,\n        style,\n        this.masterHandler.validatorSet,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startViewportRule(): void {\n    const viewportProps = {} as CssCascade.ElementStyle;\n    this.masterHandler.viewportProps.push(viewportProps);\n    this.masterHandler.pushHandler(\n      new CssCascade.PropSetParserHandler(\n        this.scope,\n        this.owner,\n        this.condition,\n        viewportProps,\n        this.masterHandler.validatorSet,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startFootnoteRule(pseudoelem: string | null): void {\n    let style = this.masterHandler.footnoteProps;\n    if (pseudoelem) {\n      const pseudos = CssCascade.getMutableStyleMap(style, \"_pseudos\");\n      style = pseudos[pseudoelem];\n      if (!style) {\n        style = {} as CssCascade.ElementStyle;\n        pseudos[pseudoelem] = style;\n      }\n    }\n    this.masterHandler.pushHandler(\n      new CssCascade.PropSetParserHandler(\n        this.scope,\n        this.owner,\n        null,\n        style,\n        this.masterHandler.validatorSet,\n      ),\n    );\n  }\n\n  /**\n   * @override\n   */\n  startRegionRule(): void {\n    this.insideRegion = true;\n    this.startSelectorRule();\n  }\n\n  /**\n   * @override\n   */\n  startPageRule(): void {\n    const pageHandler = new CssPage.PageParserHandler(\n      this.masterHandler.pageScope,\n      this.masterHandler,\n      this,\n      this.validatorSet,\n      this.masterHandler.pageProps,\n    );\n    this.masterHandler.pushHandler(pageHandler);\n    pageHandler.startPageRule();\n  }\n\n  /**\n   * @override\n   */\n  startRuleBody(): void {\n    CssCascade.CascadeParserHandler.prototype.startRuleBody.call(this);\n    if (this.insideRegion) {\n      this.insideRegion = false;\n      const regionId = `R${this.masterHandler.regionCount++}`;\n      this.special(\"region-id\", Css.getName(regionId));\n      this.endRule();\n      const regionHandler = new BaseParserHandler(\n        this.masterHandler,\n        this.condition,\n        this,\n        regionId,\n      );\n      this.masterHandler.pushHandler(regionHandler);\n      regionHandler.startRuleBody();\n    }\n  }\n}\n\n// override, so we don't register an error\nexport function processViewportMeta(meta: Element): string {\n  let content = meta.getAttribute(\"content\");\n  if (!content) {\n    return \"\";\n  }\n  const vals = {};\n  let r: RegExpMatchArray;\n  while (\n    (r = content.match(\n      /^,?\\s*([-A-Za-z_.][-A-Za-z_0-9.]*)\\s*=\\s*([-+A-Za-z_0-9.]*)\\s*/,\n    )) != null\n  ) {\n    content = content.substr(r[0].length);\n    vals[r[1]] = r[2];\n  }\n  const width = vals[\"width\"] - 0;\n  const height = vals[\"height\"] - 0;\n  if (width && height) {\n    return `@-epubx-viewport{width:${width}px;height:${height}px;}`;\n  }\n  return \"\";\n}\n\nexport class StyleParserHandler extends CssParser.DispatchParserHandler {\n  rootScope: Exprs.LexicalScope;\n  pageScope: Exprs.LexicalScope;\n  rootBox: PageMaster.RootPageBox;\n  cascadeParserHandler: BaseParserHandler;\n  regionCount: number = 0;\n  fontFaces = [] as FontFace[];\n  footnoteProps = {} as CssCascade.ElementStyle;\n  flowProps = {} as { [key: string]: CssCascade.ElementStyle };\n  viewportProps = [] as CssCascade.ElementStyle[];\n  pageProps = {} as { [key: string]: CssCascade.ElementStyle };\n  slave: BaseParserHandler;\n\n  constructor(public readonly validatorSet: CssValidator.ValidatorSet) {\n    super();\n    this.rootScope = new Exprs.LexicalScope(null);\n    this.pageScope = new Exprs.LexicalScope(this.rootScope);\n    this.rootBox = new PageMaster.RootPageBox(this.rootScope);\n    this.cascadeParserHandler = new BaseParserHandler(this, null, null, null);\n    this.slave = this.cascadeParserHandler;\n  }\n\n  /**\n   * @override\n   */\n  error(mnemonics: string, token: CssTokenizer.Token): void {\n    Logging.logger.warn(\"CSS parser:\", mnemonics);\n  }\n}\n\nexport type StyleSource = {\n  url: string;\n  text: string | null;\n  flavor: CssParser.StylesheetFlavor;\n  classes: string | null;\n  media: string | null;\n};\n\nexport function parseOPSResource(\n  response: Net.Response,\n  store: XmlDoc.XMLDocStore,\n): Task.Result<XmlDoc.XMLDocHolder> {\n  return (store as OPSDocStore).parseOPSResource(response);\n}\n\nexport class OPSDocStore extends Net.ResourceStore<XmlDoc.XMLDocHolder> {\n  styleByKey: { [key: string]: Style } = {};\n  styleFetcherByKey: { [key: string]: TaskUtil.Fetcher<Style> } = {};\n  styleByDocURL: { [key: string]: Style } = {};\n  triggersByDocURL: { [key: string]: Vtree.Trigger[] } = {};\n  validatorSet: CssValidator.ValidatorSet = null;\n  private styleSheets: StyleSource[] = [];\n  private triggerSingleDocumentPreprocessing: boolean = false;\n\n  constructor(\n    public fontDeobfuscator:\n      | ((p1: string) => ((p1: Blob) => Task.Result<Blob>) | null)\n      | null,\n  ) {\n    super(parseOPSResource, Net.XMLHttpRequestResponseType.DOCUMENT);\n  }\n\n  init(\n    authorStyleSheets: { url: string | null; text: string | null }[] | null,\n    userStyleSheets: { url: string | null; text: string | null }[] | null,\n  ): Task.Result<boolean> {\n    this.setStyleSheets(authorStyleSheets as any, userStyleSheets as any);\n    const userAgentXML = Base.resolveURL(\n      \"user-agent.xml\",\n      Base.resourceBaseURL,\n    );\n    const frame = Task.newFrame<boolean>(\"OPSDocStore.init\");\n    this.validatorSet = CssValidator.baseValidatorSet();\n    loadUABase().then(() => {\n      this.load(userAgentXML).then(() => {\n        this.triggerSingleDocumentPreprocessing = true;\n        frame.finish(true);\n      });\n    });\n    return frame.result();\n  }\n\n  getStyleForDoc(xmldoc: XmlDoc.XMLDocHolder): Style {\n    return this.styleByDocURL[xmldoc.url];\n  }\n\n  getTriggersForDoc(xmldoc: XmlDoc.XMLDocHolder): Vtree.Trigger[] {\n    return this.triggersByDocURL[xmldoc.url];\n  }\n\n  /**\n   * Set author stylesheets and user stylesheets. Existing style sheets are\n   * removed.\n   */\n  private setStyleSheets(\n    authorStyleSheets: StyleSource[] | null,\n    userStyleSheets: StyleSource[] | null,\n  ) {\n    this.clearStyleSheets();\n    if (authorStyleSheets) {\n      authorStyleSheets.forEach(this.addAuthorStyleSheet, this);\n    }\n    if (userStyleSheets) {\n      userStyleSheets.forEach(this.addUserStyleSheet, this);\n    }\n  }\n\n  private clearStyleSheets() {\n    this.styleSheets.splice(0);\n  }\n\n  private addAuthorStyleSheet(stylesheet: StyleSource) {\n    let url = stylesheet.url;\n    if (url) {\n      url = Base.resolveURL(Base.convertSpecialURL(url), Base.baseURL);\n    }\n    this.styleSheets.push({\n      url,\n      text: stylesheet.text,\n      flavor: CssParser.StylesheetFlavor.AUTHOR,\n      classes: null,\n      media: null,\n    });\n  }\n\n  private addUserStyleSheet(stylesheet: StyleSource) {\n    let url = stylesheet.url;\n    if (url) {\n      url = Base.resolveURL(Base.convertSpecialURL(url), Base.baseURL);\n    }\n    this.styleSheets.push({\n      url,\n      text: stylesheet.text,\n      flavor: CssParser.StylesheetFlavor.USER,\n      classes: null,\n      media: null,\n    });\n  }\n\n  parseOPSResource(response: Net.Response): Task.Result<XmlDoc.XMLDocHolder> {\n    const frame: Task.Frame<XmlDoc.XMLDocHolder> = Task.newFrame(\n      \"OPSDocStore.load\",\n    );\n    const self = this;\n    const url = response.url;\n\n    // Hack for TOCView.showTOC()\n    const isTocBox = url.endsWith(\"?viv-toc-box\");\n\n    XmlDoc.parseXMLResource(response, self).then(\n      (xmldoc: XmlDoc.XMLDocHolder) => {\n        if (!xmldoc) {\n          frame.finish(null);\n          return;\n        }\n        if (self.triggerSingleDocumentPreprocessing) {\n          const hooks: Plugin.PreProcessSingleDocumentHook[] = Plugin.getHooksForName(\n            Plugin.HOOKS.PREPROCESS_SINGLE_DOCUMENT,\n          );\n          for (let i = 0; i < hooks.length; i++) {\n            try {\n              hooks[i](xmldoc.document);\n            } catch (e) {\n              Logging.logger.warn(\n                \"Error during single document preprocessing:\",\n                e,\n              );\n            }\n          }\n        }\n        const triggers = [];\n        const triggerList = xmldoc.document.getElementsByTagNameNS(\n          Base.NS.epub,\n          \"trigger\",\n        );\n        for (let i = 0; i < triggerList.length; i++) {\n          const triggerElem = triggerList[i];\n          const observer = triggerElem.getAttributeNS(Base.NS.EV, \"observer\");\n          const event = triggerElem.getAttributeNS(Base.NS.EV, \"event\");\n          const action = triggerElem.getAttribute(\"action\");\n          const ref = triggerElem.getAttribute(\"ref\");\n          if (observer && event && action && ref) {\n            triggers.push({ observer, event, action, ref });\n          }\n        }\n        self.triggersByDocURL[url] = triggers;\n        const sources = [] as StyleSource[];\n        const userAgentURL = Base.resolveURL(\n          \"user-agent-page.css\",\n          Base.resourceBaseURL,\n        );\n        sources.push({\n          url: userAgentURL,\n          text: UserAgentPageCss,\n          flavor: CssParser.StylesheetFlavor.USER_AGENT,\n          classes: null,\n          media: null,\n        });\n        const head = xmldoc.head;\n        if (!isTocBox && head) {\n          for (let c: Node = head.firstChild; c; c = c.nextSibling) {\n            if (c.nodeType != 1) {\n              continue;\n            }\n            const child = c as Element;\n            const ns = child.namespaceURI;\n            const localName = child.localName;\n            if (ns == Base.NS.XHTML) {\n              if (localName == \"style\") {\n                const classes = child.getAttribute(\"class\");\n                const media = child.getAttribute(\"media\");\n                const title = child.getAttribute(\"title\");\n                sources.push({\n                  url,\n                  text: child.textContent,\n                  flavor: CssParser.StylesheetFlavor.AUTHOR,\n                  classes: title ? classes : null,\n                  media,\n                });\n              } else if (localName == \"link\") {\n                const rel = child.getAttribute(\"rel\");\n                const classes = child.getAttribute(\"class\");\n                const media = child.getAttribute(\"media\");\n                if (\n                  rel == \"stylesheet\" ||\n                  (rel == \"alternate stylesheet\" && classes)\n                ) {\n                  let src = child.getAttribute(\"href\");\n                  src = Base.resolveURL(src, url);\n                  const title = child.getAttribute(\"title\");\n                  sources.push({\n                    url: src,\n                    text: null,\n                    classes: title ? classes : null,\n                    media,\n                    flavor: CssParser.StylesheetFlavor.AUTHOR,\n                  });\n                }\n              } else if (\n                localName == \"meta\" &&\n                child.getAttribute(\"name\") == \"viewport\"\n              ) {\n                sources.push({\n                  url,\n                  text: processViewportMeta(child),\n                  flavor: CssParser.StylesheetFlavor.AUTHOR,\n                  classes: null,\n                  media: null,\n                });\n              }\n            } else if (ns == Base.NS.FB2) {\n              if (\n                localName == \"stylesheet\" &&\n                child.getAttribute(\"type\") == \"text/css\"\n              ) {\n                sources.push({\n                  url,\n                  text: child.textContent,\n                  flavor: CssParser.StylesheetFlavor.AUTHOR,\n                  classes: null,\n                  media: null,\n                });\n              }\n            } else if (ns == Base.NS.SSE && localName === \"property\") {\n              // look for stylesheet specification like:\n              // <property><name>stylesheet</name><value>style.css</value></property>\n              const name = child.getElementsByTagName(\"name\")[0];\n              if (name && name.textContent === \"stylesheet\") {\n                const value = child.getElementsByTagName(\"value\")[0];\n                if (value) {\n                  const src = Base.resolveURL(value.textContent, url);\n                  sources.push({\n                    url: src,\n                    text: null,\n                    classes: null,\n                    media: null,\n                    flavor: CssParser.StylesheetFlavor.AUTHOR,\n                  });\n                }\n              }\n            }\n          }\n        }\n        if (!isTocBox) {\n          for (let i = 0; i < self.styleSheets.length; i++) {\n            sources.push(self.styleSheets[i]);\n          }\n        }\n        let key = \"\";\n        for (let i = 0; i < sources.length; i++) {\n          key += sources[i].url;\n          key += \"^\";\n          if (sources[i].text) {\n            key += sources[i].text;\n          }\n          key += \"^\";\n        }\n        let style = self.styleByKey[key];\n        if (style) {\n          self.styleByDocURL[url] = style;\n          frame.finish(xmldoc);\n          return;\n        }\n        let fetcher = self.styleFetcherByKey[key];\n        if (!fetcher) {\n          fetcher = new TaskUtil.Fetcher(() => {\n            const innerFrame: Task.Frame<Style> = Task.newFrame(\n              \"fetchStylesheet\",\n            );\n            let index = 0;\n            const sph = new StyleParserHandler(self.validatorSet);\n            innerFrame\n              .loop(() => {\n                if (index < sources.length) {\n                  const source = sources[index++];\n                  sph.startStylesheet(source.flavor);\n                  if (source.text !== null) {\n                    return CssParser.parseStylesheetFromText(\n                      source.text,\n                      sph,\n                      source.url,\n                      source.classes,\n                      source.media,\n                    ).thenReturn(true);\n                  } else {\n                    return CssParser.parseStylesheetFromURL(\n                      source.url,\n                      sph,\n                      source.classes,\n                      source.media,\n                    );\n                  }\n                }\n                return Task.newResult(false);\n              })\n              .then(() => {\n                const cascade = sph.cascadeParserHandler.finish();\n                style = new Style(\n                  self,\n                  sph.rootScope,\n                  sph.pageScope,\n                  cascade,\n                  sph.rootBox,\n                  sph.fontFaces,\n                  sph.footnoteProps,\n                  sph.flowProps,\n                  sph.viewportProps,\n                  sph.pageProps,\n                );\n                self.styleByKey[key] = style;\n                delete self.styleFetcherByKey[key];\n                innerFrame.finish(style);\n              });\n            return innerFrame.result();\n          }, `FetchStylesheet ${url}`);\n          self.styleFetcherByKey[key] = fetcher;\n          fetcher.start();\n        }\n        fetcher.get().then((style) => {\n          self.styleByDocURL[url] = style;\n          frame.finish(xmldoc);\n        });\n      },\n    );\n    return frame.result();\n  }\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2017 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Sha1 - Calculate SHA1 hash of the given content.\n */\nimport * as Base from \"./base\";\n\n/**\n * @return big-endian byte sequence\n */\nexport function encode32(n: number): string {\n  return String.fromCharCode(\n    (n >>> 24) & 255,\n    (n >>> 16) & 255,\n    (n >>> 8) & 255,\n    n & 255,\n  );\n}\n\n/**\n * @param bytes big-endian byte sequence\n */\nexport function decode32(bytes: string): number {\n  // Important facts: \"\".charCodeAt(0) == NaN, NaN & 0xFF == 0\n  const b0 = bytes.charCodeAt(0) & 255;\n  const b1 = bytes.charCodeAt(1) & 255;\n  const b2 = bytes.charCodeAt(2) & 255;\n  const b3 = bytes.charCodeAt(3) & 255;\n  return (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;\n}\n\n/**\n * @param bytes chars with codes 0 - 255 that represent message byte values\n * @return big-endian uint32 numbers representing sha1 hash\n */\nexport function bytesToSHA1Int32(bytes: string): number[] {\n  const sb = new Base.StringBuffer();\n  sb.append(bytes);\n  let appendCount = (55 - bytes.length) & 63;\n  sb.append(\"\\u0080\");\n  while (appendCount > 0) {\n    appendCount--;\n    sb.append(\"\\x00\");\n  }\n  sb.append(\"\\x00\\x00\\x00\\x00\");\n  sb.append(encode32(bytes.length * 8));\n  bytes = sb.toString();\n  const h = [1732584193, 4023233417, 2562383102, 271733878, 3285377520];\n  const w =\n    /** @type Array.<number> */\n    [] as number[];\n  let i: number;\n  for (let bi = 0; bi < bytes.length; bi += 64) {\n    for (i = 0; i < 16; i++) {\n      w[i] = decode32(bytes.substr(bi + 4 * i, 4));\n    }\n    for (; i < 80; i++) {\n      const q = w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16];\n      w[i] = (q << 1) | (q >>> 31);\n    }\n    let a = h[0];\n    let b = h[1];\n    let c = h[2];\n    let d = h[3];\n    let e = h[4];\n    let f: number;\n    for (i = 0; i < 80; i++) {\n      if (i < 20) {\n        f = ((b & c) | (~b & d)) + 1518500249;\n      } else if (i < 40) {\n        f = (b ^ c ^ d) + 1859775393;\n      } else if (i < 60) {\n        f = ((b & c) | (b & d) | (c & d)) + 2400959708;\n      } else {\n        f = (b ^ c ^ d) + 3395469782;\n      }\n      f += ((a << 5) | (a >>> 27)) + e + w[i];\n      e = d;\n      d = c;\n      c = (b << 30) | (b >>> 2);\n      b = a;\n      a = f;\n    }\n    h[0] = (h[0] + a) | 0;\n    h[1] = (h[1] + b) | 0;\n    h[2] = (h[2] + c) | 0;\n    h[3] = (h[3] + d) | 0;\n    h[4] = (h[4] + e) | 0;\n  }\n  return h;\n}\n\n/**\n * @param bytes chars with codes 0 - 255 that represent message byte values\n * @return uint8 numbers representing sha1 hash\n */\nexport function bytesToSHA1Int8(bytes: string): number[] {\n  const h = bytesToSHA1Int32(bytes);\n  const res = [];\n  for (const n of h) {\n    res.push((n >>> 24) & 255, (n >>> 16) & 255, (n >>> 8) & 255, n & 255);\n  }\n  return res;\n}\n\n/**\n * @param bytes chars with codes 0 - 255 that represent message byte values\n * @return chars with codes 0 - 255 equal to SHA1 hash of the input\n */\nexport function bytesToSHA1Bytes(bytes: string): string {\n  const h = bytesToSHA1Int32(bytes);\n  const sb = new Base.StringBuffer();\n  for (let i = 0; i < h.length; i++) {\n    sb.append(encode32(h[i]));\n  }\n  return sb.toString();\n}\n\n/**\n * @param bytes chars with codes 0 - 255 that represent message byte values\n * @return hex-encoded SHA1 hash\n */\nexport function bytesToSHA1Hex(bytes: string): string {\n  const sha1 = bytesToSHA1Bytes(bytes);\n  const sb = new Base.StringBuffer();\n  for (let i = 0; i < sha1.length; i++) {\n    sb.append((sha1.charCodeAt(i) | 256).toString(16).substr(1));\n  }\n  return sb.toString();\n}\n\n/**\n * @param bytes chars with codes 0 - 255 that represent message byte values\n * @return base64-encoded SHA1 hash of the input\n */\nexport function bytesToSHA1Base64(bytes: string): string {\n  const sha1 = bytesToSHA1Bytes(bytes);\n  const sb = new Base.StringBuffer();\n  Base.appendBase64(sb, sha1);\n  return sb.toString();\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2019 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Toc - Table of Contents view.\n */\nimport * as Base from \"./base\";\nimport * as Counters from \"./counters\";\nimport * as Css from \"./css\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as OPS from \"./ops\";\nimport * as Task from \"./task\";\nimport * as Vgen from \"./vgen\";\nimport * as Vtree from \"./vtree\";\nimport * as XmlDoc from \"./xml-doc\";\n\n// closed: 25B8\n// open: 25BE\n// empty: 25B9\nexport const bulletClosed = \"\\u25b8\";\n\nexport const bulletOpen = \"\\u25be\";\n\nexport const bulletEmpty = \"\\u25b9\";\n\nexport class TOCView implements Vgen.CustomRendererFactory {\n  pref: Exprs.Preferences;\n  page: Vtree.Page = null;\n  instance: OPS.StyleInstance = null;\n\n  constructor(\n    public readonly store: OPS.OPSDocStore,\n    public readonly url: string,\n    public readonly lang: string | null,\n    public readonly clientLayout: Vtree.ClientLayout,\n    public readonly fontMapper: Font.Mapper,\n    pref: Exprs.Preferences,\n    public readonly rendererFactory: Vgen.CustomRendererFactory,\n    public readonly fallbackMap: { [key: string]: string },\n    public readonly documentURLTransformer: Base.DocumentURLTransformer,\n    public readonly counterStore: Counters.CounterStore,\n  ) {\n    this.pref = Exprs.clonePreferences(pref);\n    this.pref.spreadView = false; // No spred view for TOC box\n  }\n\n  setAutoHeight(elem: Element, depth: number): void {\n    if (depth-- == 0) {\n      return;\n    }\n    for (let c: Node = elem.firstChild; c; c = c.nextSibling) {\n      if (c.nodeType == 1) {\n        const e = c as Element;\n        if (Base.getCSSProperty(e, \"height\", \"auto\") != \"auto\") {\n          Base.setCSSProperty(e, \"height\", \"auto\");\n          this.setAutoHeight(e, depth);\n        }\n        if (Base.getCSSProperty(e, \"position\", \"static\") == \"absolute\") {\n          Base.setCSSProperty(e, \"position\", \"relative\");\n          this.setAutoHeight(e, depth);\n        }\n      }\n    }\n  }\n\n  /**\n   * @override\n   */\n  makeCustomRenderer(xmldoc: XmlDoc.XMLDocHolder): Vgen.CustomRenderer {\n    const renderer = this.rendererFactory.makeCustomRenderer(xmldoc);\n    return (\n      srcElem: Element,\n      viewParent: Element,\n      computedStyle: { [key: string]: Css.Val },\n    ): Task.Result<Element> => {\n      const behavior = computedStyle[\"behavior\"];\n      if (behavior) {\n        switch (behavior.toString()) {\n          case \"body-child\":\n            if (\n              srcElem.parentElement.getAttribute(\n                \"data-vivliostyle-primary-entry\",\n              )\n            ) {\n              if (\n                !srcElem.querySelector(\n                  \"[role=doc-toc], [role=directory], nav li a, .toc, #toc\",\n                )\n              ) {\n                // When the TOC element is a part of the primaty entry (X)HTML,\n                // hide elements not containing TOC.\n                computedStyle[\"display\"] = Css.ident.none;\n              }\n            }\n            break;\n          case \"toc-node-anchor\":\n            computedStyle[\"color\"] = Css.ident.inherit;\n            computedStyle[\"text-decoration\"] = Css.ident.none;\n            break;\n          case \"toc-node\":\n            computedStyle[\"display\"] = Css.ident.block;\n            computedStyle[\"margin\"] = Css.numericZero;\n            computedStyle[\"padding\"] = Css.numericZero;\n            computedStyle[\"padding-inline-start\"] = new Css.Numeric(1.25, \"em\");\n            break;\n          case \"toc-node-first-child\":\n            computedStyle[\"display\"] = Css.ident.inline_block;\n            computedStyle[\"margin\"] = new Css.Numeric(0.2, \"em\");\n            computedStyle[\"vertical-align\"] = Css.ident.top;\n            computedStyle[\"color\"] = Css.ident.inherit;\n            computedStyle[\"text-decoration\"] = Css.ident.none;\n            break;\n        }\n      }\n      if (\n        !behavior ||\n        (behavior.toString() != \"toc-node\" &&\n          behavior.toString() != \"toc-container\")\n      ) {\n        return renderer(srcElem, viewParent, computedStyle);\n      }\n      // Remove white-space textnode that becomes unwanted space between button and anchor element.\n      const firstChild = srcElem.firstChild;\n      if (\n        firstChild &&\n        firstChild.nodeType !== 1 &&\n        firstChild.textContent.trim() === \"\"\n      ) {\n        // To avoid \"Inconsistent offset\" error, create a comment node with same white-space text.\n        srcElem.replaceChild(\n          srcElem.ownerDocument.createComment(firstChild.textContent),\n          firstChild,\n        );\n      }\n      const adaptParentClass = viewParent.getAttribute(\"data-adapt-class\");\n      if (adaptParentClass == \"toc-node\") {\n        const button = viewParent.firstChild as Element;\n        if (button.textContent != bulletClosed) {\n          button.textContent = bulletClosed;\n          Base.setCSSProperty(button, \"cursor\", \"pointer\");\n          button.addEventListener(\"click\", toggleNodeExpansion, false);\n\n          button.setAttribute(\"role\", \"button\");\n          button.setAttribute(\"aria-expanded\", \"false\");\n          viewParent.setAttribute(\"aria-expanded\", \"false\");\n\n          // Enable tab move to the button unless hidden.\n          if ((viewParent as HTMLElement).style.height !== \"0px\") {\n            (button as HTMLElement).tabIndex = 0;\n          }\n        }\n      }\n      const element = viewParent.ownerDocument.createElement(\"div\");\n      element.setAttribute(\"data-adapt-process-children\", \"true\");\n      if (behavior.toString() == \"toc-node\") {\n        const button = viewParent.ownerDocument.createElement(\"div\");\n        button.textContent = bulletEmpty;\n\n        // TODO: define pseudo-element for the button?\n        Base.setCSSProperty(button, \"margin\", \"0.2em 0 0 -1em\");\n        Base.setCSSProperty(button, \"margin-inline-start\", \"-1em\");\n        Base.setCSSProperty(button, \"margin-inline-end\", \"0\");\n        Base.setCSSProperty(button, \"display\", \"inline-block\");\n        Base.setCSSProperty(button, \"width\", \"1em\");\n        Base.setCSSProperty(button, \"text-align\", \"center\");\n        Base.setCSSProperty(button, \"vertical-align\", \"top\");\n        Base.setCSSProperty(button, \"cursor\", \"default\");\n        Base.setCSSProperty(button, \"font-family\", \"Menlo,sans-serif\");\n        element.appendChild(button);\n        Base.setCSSProperty(element, \"overflow\", \"hidden\");\n        element.setAttribute(\"data-adapt-class\", \"toc-node\");\n        element.setAttribute(\"role\", \"treeitem\");\n\n        if (\n          adaptParentClass == \"toc-node\" ||\n          adaptParentClass == \"toc-container\"\n        ) {\n          Base.setCSSProperty(element, \"height\", \"0px\");\n\n          // Prevent tab move to hidden anchor.\n          const anchorElem = srcElem.firstElementChild;\n          if (anchorElem && anchorElem.localName === \"a\") {\n            (anchorElem as HTMLElement).tabIndex = -1;\n          }\n        } else {\n          viewParent.setAttribute(\"role\", \"tree\");\n        }\n      } else {\n        if (adaptParentClass == \"toc-node\") {\n          element.setAttribute(\"data-adapt-class\", \"toc-container\");\n          element.setAttribute(\"role\", \"group\");\n          element.setAttribute(\"aria-hidden\", \"true\");\n        }\n      }\n      return Task.newResult(element as Element);\n    };\n  }\n\n  showTOC(\n    elem: HTMLElement,\n    viewport: Vgen.Viewport,\n    width: number,\n    height: number,\n    fontSize: number,\n  ): Task.Result<Vtree.Page> {\n    if (this.page) {\n      return Task.newResult(this.page as Vtree.Page);\n    }\n    const self = this;\n    const frame: Task.Frame<Vtree.Page> = Task.newFrame(\"showTOC\");\n    const page = new Vtree.Page(elem, elem);\n    this.page = page;\n\n    // The (X)HTML doc for the TOC box may be reused for the TOC page in the book,\n    // but they need different styles. So, add \"?viv-toc-box\" to distinguish with TOC page URL.\n    const tocBoxUrl = this.url + \"?viv-toc-box\";\n\n    this.store.load(tocBoxUrl).then((xmldoc) => {\n      // Mark if this doc is the primary entry page.\n      const nonTocBoxDoc = this.store.resources[this.url];\n      if (\n        nonTocBoxDoc &&\n        nonTocBoxDoc.body &&\n        nonTocBoxDoc.body.getAttribute(\"data-vivliostyle-primary-entry\")\n      ) {\n        xmldoc.body.setAttribute(\"data-vivliostyle-primary-entry\", true);\n      }\n\n      const style = self.store.getStyleForDoc(xmldoc);\n      const viewportSize = style.sizeViewport(width, 100000, fontSize);\n      viewport = new Vgen.Viewport(\n        viewport.window,\n        viewportSize.fontSize,\n        viewport.root,\n        viewportSize.width,\n        viewportSize.height,\n      );\n      const customRenderer = self.makeCustomRenderer(xmldoc);\n      const instance = new OPS.StyleInstance(\n        style,\n        xmldoc,\n        self.lang,\n        viewport,\n        self.clientLayout,\n        self.fontMapper,\n        customRenderer,\n        self.fallbackMap,\n        0,\n        self.documentURLTransformer,\n        self.counterStore,\n      );\n      self.instance = instance;\n      instance.pref = self.pref;\n      instance.init().then(() => {\n        instance.layoutNextPage(page, null).then(() => {\n          Array.from(\n            page.container.querySelectorAll(\n              \"[data-vivliostyle-toc-box]>*>*>*>*>*[style*='display: none']\",\n            ),\n          ).forEach((bodyChildElem) => {\n            bodyChildElem.setAttribute(\"aria-hidden\", \"true\");\n            bodyChildElem.setAttribute(\"hidden\", \"hidden\");\n          });\n          self.setAutoHeight(elem, 2);\n          frame.finish(page);\n        });\n      });\n    });\n    return frame.result();\n  }\n\n  hideTOC(): void {\n    if (this.page) {\n      this.page.container.style.visibility = \"hidden\";\n      this.page.container.setAttribute(\"aria-hidden\", \"true\");\n    }\n  }\n\n  isTOCVisible(): boolean {\n    return !!this.page && this.page.container.style.visibility === \"visible\";\n  }\n}\n\nexport function toggleNodeExpansion(evt: Event): void {\n  const elem = evt.target as Element;\n  const open = elem.textContent == bulletClosed;\n  elem.textContent = open ? bulletOpen : bulletClosed;\n  const tocNodeElem = elem.parentNode as Element;\n  elem.setAttribute(\"aria-expanded\", open ? \"true\" : \"false\");\n  tocNodeElem.setAttribute(\"aria-expanded\", open ? \"true\" : \"false\");\n  let c: Node = tocNodeElem.firstChild;\n  while (c) {\n    if (c.nodeType === 1) {\n      const ce = c as HTMLElement;\n      const adaptClass = ce.getAttribute(\"data-adapt-class\");\n      if (adaptClass === \"toc-container\") {\n        ce.setAttribute(\"aria-hidden\", !open ? \"true\" : \"false\");\n        if (ce.firstChild) {\n          c = ce.firstChild;\n          continue;\n        }\n      } else if (adaptClass === \"toc-node\") {\n        ce.style.height = open ? \"auto\" : \"0px\";\n\n        // Update enable/disable tab move to the button and anchor.\n        if (ce.children.length >= 2) {\n          (ce.children[1] as HTMLElement).tabIndex = open ? 0 : -1;\n        }\n        if (ce.children.length >= 3) {\n          (ce.children[0] as HTMLElement).tabIndex = open ? 0 : -1;\n          if (!open) {\n            const elem1 = ce.children[0];\n            if (elem1.textContent == bulletOpen) {\n              elem1.textContent = bulletClosed;\n              elem1.setAttribute(\"aria-expanded\", \"false\");\n              ce.setAttribute(\"aria-expanded\", \"false\");\n              c = ce.children[2];\n              continue;\n            }\n          }\n        }\n      }\n    }\n    while (!c.nextSibling && c.parentNode !== tocNodeElem) {\n      c = c.parentNode;\n    }\n    c = c.nextSibling;\n  }\n  evt.stopPropagation();\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2018 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview Epub - Deal with META-INF/ and .opf files in EPUB container.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as CFI from \"./cfi\";\nimport * as Constants from \"./constants\";\nimport * as Counters from \"./counters\";\nimport * as Css from \"./css\";\nimport * as CssCascade from \"./css-cascade\";\nimport * as CssParser from \"./css-parser\";\nimport * as CssTokenizer from \"./css-tokenizer\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as Logging from \"./logging\";\nimport * as Net from \"./net\";\nimport * as OPS from \"./ops\";\nimport * as SHA1 from \"./sha1\";\nimport * as Task from \"./task\";\nimport * as Toc from \"./toc\";\nimport * as Vgen from \"./vgen\";\nimport * as Vtree from \"./vtree\";\nimport * as XmlDoc from \"./xml-doc\";\n\nexport type Position = {\n  spineIndex: number;\n  pageIndex: number;\n  offsetInItem: number;\n};\n\nexport class EPUBDocStore extends OPS.OPSDocStore {\n  plainXMLStore: XmlDoc.XMLDocStore;\n  jsonStore: Net.JSONStore;\n  opfByURL: { [key: string]: OPFDoc } = {};\n  primaryOPFByEPubURL: { [key: string]: OPFDoc } = {};\n  deobfuscators: { [key: string]: (p1: Blob) => Task.Result<Blob> } = {};\n  documents: { [key: string]: Task.Result<XmlDoc.XMLDocHolder> } = {};\n\n  constructor() {\n    super(null);\n    this.fontDeobfuscator = this.makeDeobfuscatorFactory();\n    this.plainXMLStore = XmlDoc.newXMLDocStore();\n    this.jsonStore = Net.newJSONStore();\n  }\n\n  makeDeobfuscatorFactory():\n    | ((p1: string) => ((p1: Blob) => Task.Result<Blob>) | null)\n    | null {\n    const self = this;\n    return (url: string): ((p1: Blob) => Task.Result<Blob>) | null => {\n      return self.deobfuscators[url];\n    };\n  }\n\n  loadAsPlainXML(\n    url: string,\n    opt_required?: boolean,\n    opt_message?: string,\n  ): Task.Result<XmlDoc.XMLDocHolder> {\n    return this.plainXMLStore.load(\n      url,\n      opt_required,\n      opt_message,\n    ) as Task.Result<XmlDoc.XMLDocHolder>;\n  }\n\n  startLoadingAsPlainXML(url: string): void {\n    this.plainXMLStore.fetch(url);\n  }\n\n  loadAsJSON(\n    url: string,\n    opt_required?: boolean,\n    opt_message?: string,\n  ): Task.Result<Base.JSON> {\n    return this.jsonStore.load(url, opt_required, opt_message);\n  }\n\n  startLoadingAsJSON(url: string): void {\n    this.jsonStore.fetch(url);\n  }\n\n  loadPubDoc(url: string, haveZipMetadata: boolean): Task.Result<OPFDoc> {\n    const frame: Task.Frame<OPFDoc> = Task.newFrame(\"loadPubDoc\");\n\n    Net.ajax(url, null, \"HEAD\").then((response) => {\n      if (response.status >= 400) {\n        // This url can be the root of an unzipped EPUB.\n        this.loadEPUBDoc(url, haveZipMetadata).then((opf) => {\n          if (opf) {\n            frame.finish(opf);\n            return;\n          }\n          Logging.logger.error(\n            `Failed to fetch a source document from ${url} (${response.status}${\n              response.statusText ? \" \" + response.statusText : \"\"\n            })`,\n          );\n          frame.finish(null);\n        });\n      } else {\n        if (\n          !response.status &&\n          !response.responseXML &&\n          !response.responseText &&\n          !response.responseBlob &&\n          !response.contentType\n        ) {\n          // Empty response\n          if (/\\/[^/.]+(?:[#?]|$)/.test(url)) {\n            // Adding trailing \"/\" may solve the problem.\n            url = url.replace(/([#?]|$)/, \"/$1\");\n          } else {\n            // Ignore empty response of HEAD request, it may become OK with GET request.\n          }\n        }\n        if (\n          response.contentType == \"application/oebps-package+xml\" ||\n          /\\.opf(?:[#?]|$)/.test(url)\n        ) {\n          // EPUB OPF\n          const [, pubURL, root] = url.match(/^((?:.*\\/)?)([^/]*)$/);\n          this.loadOPF(pubURL, root, haveZipMetadata).thenFinish(frame);\n        } else if (\n          response.contentType == \"application/ld+json\" ||\n          response.contentType == \"application/webpub+json\" ||\n          response.contentType == \"application/audiobook+json\" ||\n          response.contentType == \"application/json\" ||\n          /\\.json(?:ld)?(?:[#?]|$)/.test(url)\n        ) {\n          // Web Publication Manifest\n          this.loadAsJSON(url, true).then((manifestObj) => {\n            if (!manifestObj) {\n              Logging.logger.error(\n                `Received an empty response for ${url}. This may be caused by the server not allowing cross-origin resource sharing (CORS).`,\n              );\n              frame.finish(null);\n              return;\n            }\n            const opf = new OPFDoc(this, url);\n            opf.initWithWebPubManifest(manifestObj).then(() => {\n              frame.finish(opf);\n            });\n          });\n        } else {\n          // Web Publication primary entry (X)HTML\n          this.loadWebPub(url).then((opf) => {\n            if (opf) {\n              frame.finish(opf);\n              return;\n            }\n            // This url can be the root of an unzipped EPUB.\n            this.loadEPUBDoc(url, haveZipMetadata).then((opf) => {\n              if (opf) {\n                frame.finish(opf);\n                return;\n              }\n              Logging.logger.error(`Failed to load ${url}.`);\n              frame.finish(null);\n            });\n          });\n        }\n      }\n    });\n    return frame.result();\n  }\n\n  loadEPUBDoc(url: string, haveZipMetadata: boolean): Task.Result<OPFDoc> {\n    const frame: Task.Frame<OPFDoc> = Task.newFrame(\"loadEPUBDoc\");\n    if (!url.endsWith(\"/\")) {\n      url = url + \"/\";\n    }\n    if (haveZipMetadata) {\n      this.startLoadingAsJSON(url + \"?r=list\");\n    }\n    this.startLoadingAsPlainXML(url + \"META-INF/encryption.xml\");\n    const containerURL = url + \"META-INF/container.xml\";\n    this.loadAsPlainXML(containerURL).then((containerXML) => {\n      if (containerXML) {\n        const roots = containerXML\n          .doc()\n          .child(\"container\")\n          .child(\"rootfiles\")\n          .child(\"rootfile\")\n          .attribute(\"full-path\");\n        for (const root of roots) {\n          if (root) {\n            this.loadOPF(url, root, haveZipMetadata).thenFinish(frame);\n            return;\n          }\n        }\n        frame.finish(null);\n      }\n    });\n    return frame.result();\n  }\n\n  loadOPF(\n    pubURL: string,\n    root: string,\n    haveZipMetadata: boolean,\n  ): Task.Result<OPFDoc> {\n    const self = this;\n    const url = pubURL + root;\n    let opf = self.opfByURL[url];\n    if (opf) {\n      return Task.newResult(opf);\n    }\n    const frame: Task.Frame<OPFDoc> = Task.newFrame(\"loadOPF\");\n    self\n      .loadAsPlainXML(url, true, `Failed to fetch EPUB OPF ${url}`)\n      .then((opfXML) => {\n        if (!opfXML) {\n          Logging.logger.error(\n            `Received an empty response for EPUB OPF ${url}. This may be caused by the server not allowing cross-origin resource sharing (CORS).`,\n          );\n        } else {\n          self\n            .loadAsPlainXML(`${pubURL}META-INF/encryption.xml`)\n            .then((encXML) => {\n              const zipMetadataResult = haveZipMetadata\n                ? self.loadAsJSON(`${pubURL}?r=list`)\n                : Task.newResult(null);\n              zipMetadataResult.then((zipMetadata) => {\n                opf = new OPFDoc(self, pubURL);\n                opf\n                  .initWithXMLDoc(\n                    opfXML,\n                    encXML,\n                    zipMetadata,\n                    `${pubURL}?r=manifest`,\n                  )\n                  .then(() => {\n                    self.opfByURL[url] = opf;\n                    self.primaryOPFByEPubURL[pubURL] = opf;\n                    frame.finish(opf);\n                  });\n              });\n            });\n        }\n      });\n    return frame.result();\n  }\n\n  loadWebPub(url: string): Task.Result<OPFDoc> {\n    const frame: Task.Frame<OPFDoc> = Task.newFrame(\"loadWebPub\");\n\n    // Load the primary entry page (X)HTML\n    this.load(url).then((xmldoc) => {\n      if (!xmldoc) {\n        Logging.logger.error(\n          `Received an empty response for ${url}. This may be caused by the server not allowing cross-origin resource sharing (CORS).`,\n        );\n      } else if (\n        xmldoc.document.querySelector(\n          \"a[href='META-INF/'],a[href$='/META-INF/']\",\n        )\n      ) {\n        // This is likely the directory listing of unzipped EPUB top directory\n        frame.finish(null);\n      } else {\n        const doc = xmldoc.document;\n        const opf = new OPFDoc(this, url);\n\n        if (doc.body) {\n          doc.body.setAttribute(\"data-vivliostyle-primary-entry\", true);\n        }\n        // Find manifest, W3C WebPublication or Readium Web Publication Manifest\n        const manifestLink = doc.querySelector(\n          \"link[rel='publication'],link[rel='manifest'][type='application/webpub+json']\",\n        );\n        if (manifestLink) {\n          const href = manifestLink.getAttribute(\"href\");\n          if (/^#/.test(href)) {\n            const manifestObj = Base.stringToJSON(\n              doc.getElementById(href.substr(1)).textContent,\n            );\n            opf.initWithWebPubManifest(manifestObj, doc).then(() => {\n              frame.finish(opf);\n            });\n          } else {\n            this.loadAsJSON(\n              Base.resolveURL(manifestLink.getAttribute(\"href\"), url),\n            ).then((manifestObj) => {\n              opf.initWithWebPubManifest(manifestObj, doc).then(() => {\n                frame.finish(opf);\n              });\n            });\n          }\n        } else {\n          // No manifest\n          opf.initWithWebPubManifest({}, doc).then(() => {\n            if (opf.xhtmlToc && opf.xhtmlToc.src === xmldoc.url) {\n              // xhtmlToc is the primari entry (X)HTML\n              if (\n                !doc.querySelector(\n                  \"[role=doc-toc], [role=directory], nav, .toc, #toc\",\n                )\n              ) {\n                // TOC is not found in the primari entry (X)HTML\n                opf.xhtmlToc = null;\n              }\n            }\n            frame.finish(opf);\n          });\n        }\n      }\n    });\n    return frame.result();\n  }\n\n  addDocument(url: string, doc: Document) {\n    const frame = Task.newFrame<XmlDoc.XMLDocHolder>(\"EPUBDocStore.load\");\n    const docURL = Base.stripFragment(url);\n    const r = (this.documents[docURL] = this.parseOPSResource({\n      status: 200,\n      statusText: \"\",\n      url: docURL,\n      contentType: (doc as any).contentType,\n      responseText: null,\n      responseXML: doc,\n      responseBlob: null,\n    }));\n    r.thenFinish(frame);\n    return frame.result();\n  }\n\n  /**\n   * @override\n   */\n  load(url: string): Task.Result<XmlDoc.XMLDocHolder> {\n    const docURL = Base.stripFragment(url);\n    let r = this.documents[docURL];\n    if (r) {\n      return r.isPending() ? r : Task.newResult(r.get());\n    } else {\n      const frame = Task.newFrame<XmlDoc.XMLDocHolder>(\"EPUBDocStore.load\");\n      r = super.load(\n        docURL,\n        true,\n        `Failed to fetch a source document from ${docURL}`,\n      );\n      r.then((xmldoc: XmlDoc.XMLDocHolder) => {\n        if (!xmldoc) {\n          if (docURL.startsWith(\"data:\")) {\n            Logging.logger.error(`Failed to load ${docURL}. Invalid data.`);\n          } else if (\n            docURL.startsWith(\"http:\") &&\n            Base.baseURL.startsWith(\"https:\")\n          ) {\n            Logging.logger.error(\n              `Failed to load ${docURL}. Mixed Content (\"http:\" content on \"https:\" context) is not allowed.`,\n            );\n          } else {\n            Logging.logger.error(\n              `Received an empty response for ${docURL}. This may be caused by the server not allowing cross-origin resource sharing (CORS).`,\n            );\n          }\n        } else {\n          frame.finish(xmldoc);\n        }\n      });\n      return frame.result();\n    }\n  }\n}\n\nexport type OPFItemParam = {\n  url: string;\n  index: number;\n  startPage: number | null;\n  skipPagesBefore: number | null;\n};\n\nexport class OPFItem {\n  id: string | null = null;\n  src: string = \"\";\n  mediaType: string | null = null;\n  title: string | null = null;\n  itemRefElement: Element | null = null;\n  spineIndex: number = -1;\n  compressedSize: number = 0;\n  compressed: boolean | null = null;\n  epage: number = 0;\n  epageCount: number = 0;\n  startPage: number | null = null;\n  skipPagesBefore: number | null = null;\n  itemProperties: { [key: string]: boolean };\n\n  constructor() {\n    this.itemProperties = Base.emptyObj;\n  }\n\n  initWithElement(itemElem: Element, opfURL: string): void {\n    this.id = itemElem.getAttribute(\"id\");\n    this.src = Base.resolveURL(itemElem.getAttribute(\"href\"), opfURL);\n    this.mediaType = itemElem.getAttribute(\"media-type\");\n    const propStr = itemElem.getAttribute(\"properties\");\n    if (propStr) {\n      this.itemProperties = Base.arrayToSet(propStr.split(/\\s+/));\n    }\n  }\n\n  initWithParam(param: OPFItemParam) {\n    this.spineIndex = param.index;\n    this.id = `item${param.index + 1}`;\n    this.src = param.url;\n    this.startPage = param.startPage;\n    this.skipPagesBefore = param.skipPagesBefore;\n  }\n}\n\nexport function getOPFItemId(item: OPFItem): string | null {\n  return item.id;\n}\n\nexport function makeDeobfuscator(uid: string): (p1: Blob) => Task.Result<Blob> {\n  // TODO: use UTF8 of uid\n  const sha1Sum = SHA1.bytesToSHA1Int8(uid);\n  return (blob) => {\n    const frame = Task.newFrame(\"deobfuscator\") as Task.Frame<Blob>;\n    let head: Blob;\n    let tail: Blob;\n    if (blob.slice) {\n      head = blob.slice(0, 1040);\n      tail = blob.slice(1040, blob.size);\n    } else {\n      head = blob[\"webkitSlice\"](0, 1040);\n      tail = blob[\"webkitSlice\"](1040, blob.size - 1040);\n    }\n    Net.readBlob(head).then((buf) => {\n      const dataView = new DataView(buf);\n      for (let k = 0; k < dataView.byteLength; k++) {\n        let b = dataView.getUint8(k);\n        b ^= sha1Sum[k % 20];\n        dataView.setUint8(k, b);\n      }\n      frame.finish(Net.makeBlob([dataView, tail]));\n    });\n    return frame.result();\n  };\n}\n\nexport function makeObfuscationKey(uid: string): string {\n  return `1040:${SHA1.bytesToSHA1Hex(uid)}`;\n}\n\nexport type RawMetaItem = {\n  name: string;\n  value: string;\n  id: string | null;\n  refines: string | null;\n  scheme: string | null;\n  lang: string | null;\n  order: number;\n};\n\nexport const predefinedPrefixes = {\n  dcterms: \"http://purl.org/dc/terms/\",\n  marc: \"http://id.loc.gov/vocabulary/\",\n  media: \"http://www.idpf.org/epub/vocab/overlays/#\",\n  rendition: \"http://www.idpf.org/vocab/rendition/#\",\n  onix: \"http://www.editeur.org/ONIX/book/codelists/current.html#\",\n  xsd: \"http://www.w3.org/2001/XMLSchema#\",\n};\n\nexport const defaultIRI = \"http://idpf.org/epub/vocab/package/#\";\n\nexport const metaTerms = {\n  language: `${predefinedPrefixes[\"dcterms\"]}language`,\n  title: `${predefinedPrefixes[\"dcterms\"]}title`,\n  creator: `${predefinedPrefixes[\"dcterms\"]}creator`,\n  layout: `${predefinedPrefixes[\"rendition\"]}layout`,\n  titleType: `${defaultIRI}title-type`,\n  displaySeq: `${defaultIRI}display-seq`,\n  alternateScript: `${defaultIRI}alternate-script`,\n};\n\nexport function getMetadataComparator(\n  term: string,\n  lang: string,\n): (p1: Base.JSON, p2: Base.JSON) => number {\n  const empty = {};\n  return (item1, item2) => {\n    let m1: boolean;\n    let m2: boolean;\n    const r1 = item1[\"r\"] || empty;\n    const r2 = item2[\"r\"] || empty;\n    if (term == metaTerms.title) {\n      m1 = r1[metaTerms.titleType] == \"main\";\n      m2 = r2[metaTerms.titleType] == \"main\";\n      if (m1 != m2) {\n        return m1 ? -1 : 1;\n      }\n    }\n    let i1 = parseInt(r1[metaTerms.displaySeq], 10);\n    if (isNaN(i1)) {\n      i1 = Number.MAX_VALUE;\n    }\n    let i2 = parseInt(r2[metaTerms.displaySeq], 10);\n    if (isNaN(i2)) {\n      i2 = Number.MAX_VALUE;\n    }\n    if (i1 != i2) {\n      return i1 - i2;\n    }\n    if (term != metaTerms.language && lang) {\n      m1 = (r1[metaTerms.language] || r1[metaTerms.alternateScript]) == lang;\n      m2 = (r2[metaTerms.language] || r2[metaTerms.alternateScript]) == lang;\n      if (m1 != m2) {\n        return m1 ? -1 : 1;\n      }\n    }\n    return item1[\"o\"] - item2[\"o\"];\n  };\n}\n\nexport function readMetadata(\n  mroot: XmlDoc.NodeList,\n  prefixes: string | null,\n): Base.JSON {\n  // Parse prefix map (if any)\n  let prefixMap;\n  if (!prefixes) {\n    prefixMap = predefinedPrefixes;\n  } else {\n    prefixMap = {};\n    for (const pn in predefinedPrefixes) {\n      prefixMap[pn] = predefinedPrefixes[pn];\n    }\n    let r: RegExpMatchArray;\n\n    // This code permits any non-ASCII characters in the name to avoid bloating\n    // the pattern.\n    while (\n      (r = prefixes.match(\n        /^\\s*([A-Z_a-z\\u007F-\\uFFFF][-.A-Z_a-z0-9\\u007F-\\uFFFF]*):\\s*(\\S+)/,\n      )) != null\n    ) {\n      prefixes = prefixes.substr(r[0].length);\n      prefixMap[r[1]] = r[2];\n    }\n  }\n  const resolveProperty = (val: string | null): string | null => {\n    if (val) {\n      const r = val.match(/^\\s*(([^:]*):)?(\\S+)\\s*$/);\n      if (r) {\n        const iri = r[2] ? prefixMap[r[2]] : defaultIRI;\n        if (iri) {\n          return iri + r[3];\n        }\n      }\n    }\n    return null;\n  };\n  let order = 1;\n\n  // List of metadata items.\n  const rawItems = mroot.childElements().forEachNonNull((node: Element) => {\n    if (node.localName == \"meta\") {\n      const p = resolveProperty((node as Element).getAttribute(\"property\"));\n      if (p) {\n        return {\n          name: p,\n          value: node.textContent,\n          id: (node as Element).getAttribute(\"id\"),\n          order: order++,\n          refines: (node as Element).getAttribute(\"refines\"),\n          lang: null,\n          scheme: resolveProperty((node as Element).getAttribute(\"scheme\")),\n        };\n      }\n    } else if (node.namespaceURI == Base.NS.DC) {\n      return {\n        name: predefinedPrefixes[\"dcterms\"] + node.localName,\n        order: order++,\n        lang: (node as Element).getAttribute(\"xml:lang\"),\n        value: node.textContent,\n        id: (node as Element).getAttribute(\"id\"),\n        refines: null,\n        scheme: null,\n      };\n    }\n    return null;\n  });\n\n  // Items grouped by their target id.\n  const rawItemsByTarget = Base.multiIndexArray(\n    rawItems,\n    (rawItem) => rawItem.refines,\n  );\n  const makeMetadata = (map: {\n    [key: string]: any[];\n  }): { [key: string]: any[] } =>\n    Base.mapObj(map, (rawItemArr, itemName) =>\n      rawItemArr.map((rawItem) => {\n        const entry = { v: rawItem.value, o: rawItem.order };\n        if (rawItem.schema) {\n          entry[\"s\"] = rawItem.scheme;\n        }\n        if (rawItem.id || rawItem.lang) {\n          let refs = rawItemsByTarget[rawItem.id];\n          if (refs || rawItem.lang) {\n            if (rawItem.lang) {\n              // Special handling for xml:lang\n              const langItem = {\n                name: metaTerms.language,\n                value: rawItem.lang,\n                lang: null,\n                id: null,\n                refines: rawItem.id,\n                scheme: null,\n                order: rawItem.order,\n              };\n              if (refs) {\n                refs.push(langItem);\n              } else {\n                refs = [langItem];\n              }\n            }\n            const entryMap = Base.multiIndexArray(\n              refs,\n              (rawItem) => rawItem.name,\n            );\n            entry[\"r\"] = makeMetadata(entryMap);\n          }\n        }\n        return entry;\n      }),\n    );\n  const metadata = makeMetadata(\n    Base.multiIndexArray(rawItems, (rawItem) =>\n      rawItem.refines ? null : rawItem.name,\n    ),\n  );\n  let lang: string | null = null;\n  if (metadata[metaTerms.language]) {\n    lang = metadata[metaTerms.language][0][\"v\"];\n  }\n  const sortMetadata = (metadata: { [key: string]: any[] }) => {\n    for (const term in metadata) {\n      const arr = metadata[term];\n      arr.sort(getMetadataComparator(term, lang));\n      for (let i = 0; i < arr.length; i++) {\n        const r = arr[i][\"r\"];\n        if (r) {\n          sortMetadata(r);\n        }\n      }\n    }\n  };\n  sortMetadata(metadata);\n  return metadata;\n}\n\nexport function getMathJaxHub(): object {\n  const math = window[\"MathJax\"];\n  if (math) {\n    return math[\"Hub\"];\n  }\n  return null;\n}\n\nexport function checkMathJax(): void {\n  if (getMathJaxHub()) {\n    CssCascade.supportedNamespaces[Base.NS.MATHML] = true;\n  }\n}\n\nexport const supportedMediaTypes = {\n  \"application/xhtml+xml\": true,\n  \"image/jpeg\": true,\n  \"image/png\": true,\n  \"image/svg+xml\": true,\n  \"image/gif\": true,\n  \"audio/mp3\": true,\n};\n\nexport const transformedIdPrefix = \"viv-id-\";\n\nexport class OPFDoc {\n  opfXML: XmlDoc.XMLDocHolder = null;\n  encXML: XmlDoc.XMLDocHolder = null;\n  items: OPFItem[] = null;\n  spine: OPFItem[] = null;\n  itemMap: { [key: string]: OPFItem } = null;\n  itemMapByPath: { [key: string]: OPFItem } = null;\n  uid: string | null = null;\n  bindings: { [key: string]: string } = {};\n  lang: string | null = null;\n  epageCount: number = 0;\n  prePaginated: boolean = false;\n  epageIsRenderedPage: boolean = true;\n  epageCountCallback: (p1: number) => void | null = null;\n  metadata: Base.JSON = {};\n  ncxToc: OPFItem = null;\n  xhtmlToc: OPFItem = null;\n  cover: OPFItem = null;\n  fallbackMap: { [key: string]: string } = {};\n  pageProgression: Constants.PageProgression | null = null;\n  documentURLTransformer: Base.DocumentURLTransformer;\n\n  constructor(\n    public readonly store: EPUBDocStore,\n    public readonly pubURL: string,\n  ) {\n    this.documentURLTransformer = this.createDocumentURLTransformer();\n    checkMathJax();\n  }\n\n  // FIXME: TS4055\n  createDocumentURLTransformer(): Base.DocumentURLTransformer {\n    const self = this;\n    class OPFDocumentURLTransformer implements Base.DocumentURLTransformer {\n      /**\n       * @override\n       */\n      transformFragment(fragment: string, baseURL: string): string {\n        const url = baseURL + (fragment ? `#${fragment}` : \"\");\n        return transformedIdPrefix + Base.escapeNameStrToHex(url, \":\");\n      }\n\n      /**\n       * @override\n       */\n      transformURL(url: string, baseURL: string): string {\n        const r = url.match(/^([^#]*)#?(.*)$/);\n        if (r) {\n          const path = r[1] || baseURL;\n          const fragment = r[2];\n          if (path) {\n            if (self.items.some((item) => item.src === path)) {\n              return `#${this.transformFragment(fragment, path)}`;\n            }\n          }\n        }\n        return url;\n      }\n\n      /**\n       * @override\n       */\n      restoreURL(encoded: string): string[] {\n        if (encoded.charAt(0) === \"#\") {\n          encoded = encoded.substring(1);\n        }\n        if (encoded.indexOf(transformedIdPrefix) === 0) {\n          encoded = encoded.substring(transformedIdPrefix.length);\n        }\n        const decoded = Base.unescapeStrFromHex(encoded, \":\");\n        const r = decoded.match(/^([^#]*)#?(.*)$/);\n        return r ? [r[1], r[2]] : [];\n      }\n    }\n    return new OPFDocumentURLTransformer();\n  }\n\n  /**\n   * Metadata is organized in the following way: fully-expanded property names\n   * (with IRI prefixes prepended) point to an array of values. Array contains\n   * at least one element. First element is primary and should be used by\n   * default. Element values are objects have the following keys:\n   * - \"v\" - item value as string,\n   * - \"s\" - scheme,\n   * - \"o\" - index in the order of appearing in the source,\n   * - \"r\" - refinement submetadata (organized just like the top-level\n   * metadata).\n   */\n  getMetadata(): Base.JSON {\n    return this.metadata;\n  }\n\n  getPathFromURL(url: string): string | null {\n    if (url.startsWith(\"data:\")) {\n      return url === this.pubURL ? \"\" : url;\n    }\n    if (this.pubURL) {\n      let epubBaseURL = Base.resolveURL(\"\", this.pubURL);\n      if (url === epubBaseURL || url + \"/\" === epubBaseURL) {\n        return \"\";\n      }\n      if (epubBaseURL.charAt(epubBaseURL.length - 1) != \"/\") {\n        epubBaseURL += \"/\";\n      }\n      return url.substr(0, epubBaseURL.length) == epubBaseURL\n        ? decodeURI(url.substr(epubBaseURL.length))\n        : null;\n    } else {\n      return url;\n    }\n  }\n\n  initWithXMLDoc(\n    opfXML: XmlDoc.XMLDocHolder,\n    encXML: XmlDoc.XMLDocHolder,\n    zipMetadata: Base.JSON,\n    manifestURL: string,\n  ): Task.Result<any> {\n    const self = this;\n    this.opfXML = opfXML;\n    this.encXML = encXML;\n    const pkg = opfXML.doc().child(\"package\");\n    const uidref = pkg.attribute(\"unique-identifier\")[0];\n    if (uidref) {\n      const uidElem = opfXML.getElement(`${opfXML.url}#${uidref}`);\n      if (uidElem) {\n        this.uid = uidElem.textContent.replace(/[ \\n\\r\\t]/g, \"\");\n      }\n    }\n    const srcToFallbackId = {};\n    this.items = pkg\n      .child(\"manifest\")\n      .child(\"item\")\n      .asArray()\n      .map((node) => {\n        const item = new OPFItem();\n        const elem = node as Element;\n        item.initWithElement(elem, opfXML.url);\n        const fallback = elem.getAttribute(\"fallback\");\n        if (fallback && !supportedMediaTypes[item.mediaType]) {\n          srcToFallbackId[item.src] = fallback;\n        }\n        if (!self.xhtmlToc && item.itemProperties[\"nav\"]) {\n          self.xhtmlToc = item;\n        }\n        if (!self.cover && item.itemProperties[\"cover-image\"]) {\n          self.cover = item;\n        }\n        return item;\n      });\n    this.itemMap = Base.indexArray(\n      this.items,\n      getOPFItemId as (p1: OPFItem) => string | null,\n    );\n    this.itemMapByPath = Base.indexArray(this.items, (item) =>\n      self.getPathFromURL(item.src),\n    );\n    for (const src in srcToFallbackId) {\n      let fallbackSrc = src;\n      while (true) {\n        const item = this.itemMap[srcToFallbackId[fallbackSrc]];\n        if (!item) {\n          break;\n        }\n        if (supportedMediaTypes[item.mediaType]) {\n          this.fallbackMap[src] = item.src;\n          break;\n        }\n        fallbackSrc = item.src;\n      }\n    }\n    this.spine = pkg\n      .child(\"spine\")\n      .child(\"itemref\")\n      .asArray()\n      .map((node, index) => {\n        const elem = node as Element;\n        const id = elem.getAttribute(\"idref\");\n        const item = self.itemMap[id as string];\n        if (item) {\n          item.itemRefElement = elem;\n          item.spineIndex = index;\n        }\n        return item;\n      });\n    const tocAttr = pkg.child(\"spine\").attribute(\"toc\")[0];\n    if (tocAttr) {\n      this.ncxToc = this.itemMap[tocAttr];\n    }\n    const pageProgressionAttr = pkg\n      .child(\"spine\")\n      .attribute(\"page-progression-direction\")[0];\n    if (pageProgressionAttr) {\n      this.pageProgression = Constants.pageProgressionOf(pageProgressionAttr);\n    }\n    const idpfObfURLs = !encXML\n      ? []\n      : encXML\n          .doc()\n          .child(\"encryption\")\n          .child(\"EncryptedData\")\n          .predicate(\n            XmlDoc.predicate.withChild(\n              \"EncryptionMethod\",\n              XmlDoc.predicate.withAttribute(\n                \"Algorithm\",\n                \"http://www.idpf.org/2008/embedding\",\n              ),\n            ),\n          )\n          .child(\"CipherData\")\n          .child(\"CipherReference\")\n          .attribute(\"URI\");\n    const mediaTypeElems = pkg\n      .child(\"bindings\")\n      .child(\"mediaType\")\n      .asArray() as Element[];\n    for (let i = 0; i < mediaTypeElems.length; i++) {\n      const handlerId = mediaTypeElems[i].getAttribute(\"handler\");\n      const mediaType = mediaTypeElems[i].getAttribute(\"media-type\");\n      if (mediaType && handlerId && this.itemMap[handlerId]) {\n        this.bindings[mediaType] = this.itemMap[handlerId].src;\n      }\n    }\n    this.metadata = readMetadata(\n      pkg.child(\"metadata\"),\n      pkg.attribute(\"prefix\")[0],\n    );\n    if (this.metadata[metaTerms.language]) {\n      this.lang = this.metadata[metaTerms.language][0][\"v\"];\n    }\n    if (this.metadata[metaTerms.layout]) {\n      this.prePaginated =\n        this.metadata[metaTerms.layout][0][\"v\"] === \"pre-paginated\";\n    }\n\n    if (!zipMetadata) {\n      if (idpfObfURLs.length > 0 && this.uid) {\n        // Have to deobfuscate in JavaScript\n        const deobfuscator = makeDeobfuscator(this.uid);\n        for (let i = 0; i < idpfObfURLs.length; i++) {\n          this.store.deobfuscators[this.pubURL + idpfObfURLs[i]] = deobfuscator;\n        }\n      }\n      if (this.prePaginated) {\n        this.assignAutoPages();\n      }\n      return Task.newResult(true);\n    }\n    const manifestText = new Base.StringBuffer();\n    const obfuscations = {};\n    if (idpfObfURLs.length > 0 && this.uid) {\n      // Deobfuscate in the server.\n      const obfuscationKey = makeObfuscationKey(this.uid);\n      for (let i = 0; i < idpfObfURLs.length; i++) {\n        obfuscations[idpfObfURLs[i]] = obfuscationKey;\n      }\n    }\n    for (let i = 0; i < zipMetadata.length; i++) {\n      const entry = zipMetadata[i];\n      const encodedPath = entry[\"n\"];\n      if (encodedPath) {\n        const path = decodeURI(encodedPath);\n        const item = this.itemMapByPath[path];\n        let mediaType: string | null = null;\n        if (item) {\n          item.compressed = entry[\"m\"] != 0;\n          item.compressedSize = entry[\"c\"];\n          if (item.mediaType) {\n            mediaType = item.mediaType.replace(/\\s+/g, \"\");\n          }\n        }\n        const obfuscation = obfuscations[path];\n        if (mediaType || obfuscation) {\n          manifestText.append(encodedPath);\n          manifestText.append(\" \");\n          manifestText.append(mediaType || \"application/octet-stream\");\n          if (obfuscation) {\n            manifestText.append(\" \");\n            manifestText.append(obfuscation);\n          }\n          manifestText.append(\"\\n\");\n        }\n      }\n    }\n    self.assignAutoPages();\n    return Net.ajax(\n      manifestURL,\n      Net.XMLHttpRequestResponseType.DEFAULT,\n      \"POST\",\n      manifestText.toString(),\n      \"text/plain\",\n    );\n  }\n\n  assignAutoPages(): void {\n    let epage = 0;\n    for (const item of this.spine) {\n      const epageCount = this.prePaginated\n        ? 1\n        : Math.ceil(item.compressedSize / 1024);\n      item.epage = epage;\n      item.epageCount = epageCount;\n      epage += epageCount;\n    }\n    this.epageCount = epage;\n\n    if (this.epageCountCallback) {\n      this.epageCountCallback(this.epageCount);\n    }\n  }\n\n  setEPageCountMode(epageIsRenderedPage: boolean) {\n    this.epageIsRenderedPage = epageIsRenderedPage || this.prePaginated;\n  }\n\n  countEPages(\n    epageCountCallback: ((p1: number) => void) | null,\n  ): Task.Result<boolean> {\n    this.epageCountCallback = epageCountCallback;\n\n    if (this.epageIsRenderedPage) {\n      if (this.prePaginated && this.epageCount == 0) {\n        this.assignAutoPages();\n      }\n      return Task.newResult(true);\n    }\n\n    let epage = 0;\n    let i = 0;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"countEPages\");\n    frame\n      .loopWithFrame((loopFrame) => {\n        if (i === this.spine.length) {\n          loopFrame.breakLoop();\n          return;\n        }\n        const item = this.spine[i++];\n        item.epage = epage;\n        this.store.load(item.src).then((xmldoc) => {\n          // According to the old comment,\n          // \"Estimate that offset=2700 roughly corresponds to 1024 bytes of compressed size.\"\n          // However, it should depend on the language.\n          // Further adjustment needed.\n\n          //let offsetPerEPage = 2700;\n          let offsetPerEPage = 1800;\n          const lang = xmldoc.lang || this.lang;\n          if (lang && lang.match(/^(ja|ko|zh)/)) {\n            offsetPerEPage /= 3;\n          }\n          item.epageCount = Math.ceil(xmldoc.getTotalOffset() / offsetPerEPage);\n          epage += item.epageCount;\n          this.epageCount = epage;\n          if (this.epageCountCallback) {\n            this.epageCountCallback(this.epageCount);\n          }\n          loopFrame.continueLoop();\n        });\n      })\n      .thenFinish(frame);\n    return frame.result();\n  }\n\n  /**\n   * Creates a fake OPF \"document\" that contains OPS chapters.\n   */\n  initWithChapters(params: OPFItemParam[], doc?: Document | null) {\n    this.itemMap = {};\n    this.itemMapByPath = {};\n    this.items = [];\n    this.spine = this.items;\n\n    // create a minimum fake OPF XML for navigation with EPUB CFI\n    const opfXML = (this.opfXML = new XmlDoc.XMLDocHolder(\n      null,\n      \"\",\n      new DOMParser().parseFromString(\"<spine></spine>\", \"text/xml\"),\n    ));\n    params.forEach((param) => {\n      const item = new OPFItem();\n      item.initWithParam(param);\n      Asserts.assert(item.id);\n      const itemref = opfXML.document.createElement(\"itemref\");\n      itemref.setAttribute(\"idref\", item.id);\n      opfXML.root.appendChild(itemref);\n      item.itemRefElement = itemref;\n      this.itemMap[item.id] = item;\n      let path = this.getPathFromURL(param.url);\n      if (path == null) {\n        path = param.url;\n      }\n      this.itemMapByPath[path] = item;\n      this.items.push(item);\n    });\n    if (doc) {\n      return this.store.addDocument(params[0].url, doc);\n    } else {\n      return Task.newResult(null);\n    }\n  }\n\n  initWithWebPubManifest(\n    manifestObj: Base.JSON,\n    doc?: Document,\n  ): Task.Result<boolean> {\n    if (manifestObj[\"readingProgression\"]) {\n      this.pageProgression = manifestObj[\"readingProgression\"];\n    }\n    if (this.metadata === undefined) {\n      this.metadata = {};\n    }\n    const title =\n      (doc && doc.title) ||\n      manifestObj[\"name\"] ||\n      (manifestObj[\"metadata\"] && manifestObj[\"metadata\"][\"title\"]);\n    if (title) {\n      this.metadata[metaTerms.title] = [{ v: title }];\n    }\n    // TODO: other metadata...\n\n    const primaryEntryPath = this.getPathFromURL(this.pubURL);\n    if (!manifestObj[\"readingOrder\"] && doc && primaryEntryPath !== null) {\n      manifestObj[\"readingOrder\"] = [encodeURI(primaryEntryPath)];\n\n      // Find TOC in the primary entry (X)HTML\n      const selector =\n        \"[role=doc-toc] a[href],\" +\n        \"[role=directory] a[href],\" +\n        \"nav li a[href],\" +\n        \".toc a[href],\" +\n        \"#toc a[href]\";\n      Array.from(doc.querySelectorAll(selector)).forEach((anchorElem) => {\n        const hrefNoFragment = Base.stripFragment(\n          Base.resolveURL(anchorElem.getAttribute(\"href\"), this.pubURL),\n        );\n        const path = this.getPathFromURL(hrefNoFragment);\n        const url = path !== null ? encodeURI(path) : hrefNoFragment;\n        if (manifestObj[\"readingOrder\"].indexOf(url) == -1) {\n          manifestObj[\"readingOrder\"].push(url);\n        }\n      });\n    }\n\n    const params = [];\n    let itemCount = 0;\n    let tocFound = -1;\n    [manifestObj[\"readingOrder\"], manifestObj[\"resources\"]].forEach(\n      (readingOrderOrResources) => {\n        if (readingOrderOrResources instanceof Array) {\n          readingOrderOrResources.forEach((itemObj) => {\n            const isInReadingOrder = manifestObj[\"readingOrder\"].includes(\n              itemObj,\n            );\n            const url =\n              typeof itemObj === \"string\"\n                ? itemObj\n                : itemObj.url || itemObj.href;\n            const encodingFormat =\n              typeof itemObj === \"string\"\n                ? \"\"\n                : itemObj.encodingFormat ||\n                  (itemObj.href && itemObj.type) ||\n                  \"\";\n            if (\n              isInReadingOrder ||\n              encodingFormat === \"text/html\" ||\n              encodingFormat === \"application/xhtml+xml\" ||\n              /(^|\\/)([^/]+\\.(x?html|htm|xht)|[^/.]*)([#?]|$)/.test(url)\n            ) {\n              const param = {\n                url: Base.resolveURL(Base.convertSpecialURL(url), this.pubURL),\n                index: itemCount++,\n                startPage: null,\n                skipPagesBefore: null,\n              };\n              if (itemObj.rel === \"contents\" && tocFound === -1) {\n                tocFound = param.index;\n              }\n              params.push(param);\n\n              //TODO: items not in readingOrder should be excluded from linear reading but available with internal link navigation.\n            }\n          });\n        }\n      },\n    );\n    const frame: Task.Frame<boolean> = Task.newFrame(\"initWithWebPubManifest\");\n    this.initWithChapters(params).then(() => {\n      if (tocFound !== -1) {\n        this.xhtmlToc = this.items[tocFound];\n      }\n\n      if (!this.xhtmlToc) {\n        this.xhtmlToc = this.itemMapByPath[primaryEntryPath];\n      }\n\n      frame.finish(true);\n    });\n    return frame.result();\n  }\n\n  /**\n   * @return cfi\n   */\n  getCFI(spineIndex: number, offsetInItem: number): Task.Result<string | null> {\n    const item = this.spine[spineIndex];\n    const frame: Task.Frame<string | null> = Task.newFrame(\"getCFI\");\n    this.store.load(item.src).then((xmldoc: XmlDoc.XMLDocHolder) => {\n      const node = xmldoc.getNodeByOffset(offsetInItem);\n      let cfi: string | null = null;\n      if (node) {\n        const startOffset = xmldoc.getNodeOffset(node, 0, false);\n        const offsetInNode = offsetInItem - startOffset;\n        const fragment = new CFI.Fragment();\n        fragment.prependPathFromNode(node, offsetInNode, false, null);\n        if (item.itemRefElement) {\n          fragment.prependPathFromNode(item.itemRefElement, 0, false, null);\n        }\n        cfi = fragment.toString();\n      }\n      frame.finish(cfi);\n    });\n    return frame.result();\n  }\n\n  resolveFragment(fragstr: string | null): Task.Result<Position | null> {\n    const self = this;\n    return Task.handle(\n      \"resolveFragment\",\n      (frame: Task.Frame<Position | null>): void => {\n        if (!fragstr) {\n          frame.finish(null);\n          return;\n        }\n        let fragment = new CFI.Fragment();\n        fragment.fromString(fragstr);\n        let item: OPFItem;\n        if (self.opfXML) {\n          const opfNav = fragment.navigate(self.opfXML.document);\n          if (opfNav.node.nodeType != 1 || opfNav.after || !opfNav.ref) {\n            frame.finish(null);\n            return;\n          }\n          const elem = opfNav.node as Element;\n          const idref = elem.getAttribute(\"idref\");\n          if (elem.localName != \"itemref\" || !idref || !self.itemMap[idref]) {\n            frame.finish(null);\n            return;\n          }\n          item = self.itemMap[idref];\n          fragment = opfNav.ref;\n        } else {\n          item = self.spine[0];\n        }\n        self.store.load(item.src).then((xmldoc: XmlDoc.XMLDocHolder) => {\n          const nodeNav = fragment.navigate(xmldoc.document);\n          const offset = xmldoc.getNodeOffset(\n            nodeNav.node,\n            nodeNav.offset,\n            nodeNav.after,\n          );\n          frame.finish({\n            spineIndex: item.spineIndex,\n            offsetInItem: offset,\n            pageIndex: -1,\n          });\n        });\n      },\n      (frame: Task.Frame<Position | null>, err: Error): void => {\n        Logging.logger.warn(err, \"Cannot resolve fragment:\", fragstr);\n        frame.finish(null);\n      },\n    );\n  }\n\n  resolveEPage(epage: number): Task.Result<Position | null> {\n    const self = this;\n    return Task.handle(\n      \"resolveEPage\",\n      (frame: Task.Frame<Position | null>): void => {\n        if (epage <= 0) {\n          frame.finish({ spineIndex: 0, offsetInItem: 0, pageIndex: -1 });\n          return;\n        }\n        if (self.epageIsRenderedPage) {\n          let spineIndex = self.spine.findIndex((item) => {\n            return (\n              (item.epage == 0 && item.epageCount == 0) ||\n              (item.epage <= epage && item.epage + item.epageCount > epage)\n            );\n          });\n          if (spineIndex == -1) {\n            spineIndex = self.spine.length - 1;\n          }\n          let item = self.spine[spineIndex];\n          if (!item || item.epageCount == 0) {\n            item = self.spine[--spineIndex];\n          }\n          const pageIndex = Math.floor(epage - item.epage);\n          frame.finish({ spineIndex, offsetInItem: -1, pageIndex: pageIndex });\n          return;\n        }\n        let spineIndex = Base.binarySearch(self.spine.length, (index) => {\n          const item = self.spine[index];\n          return item.epage + item.epageCount > epage;\n        });\n        if (spineIndex == self.spine.length) {\n          spineIndex--;\n        }\n        const item = self.spine[spineIndex];\n        self.store.load(item.src).then((xmldoc: XmlDoc.XMLDocHolder) => {\n          epage -= item.epage;\n          if (epage > item.epageCount) {\n            epage = item.epageCount;\n          }\n          let offset = 0;\n          if (epage > 0) {\n            const totalOffset = xmldoc.getTotalOffset();\n            offset = Math.round((totalOffset * epage) / item.epageCount);\n            if (offset == totalOffset) {\n              offset--;\n            }\n          }\n          frame.finish({ spineIndex, offsetInItem: offset, pageIndex: -1 });\n        });\n      },\n      (frame: Task.Frame<Position | null>, err: Error): void => {\n        Logging.logger.warn(err, \"Cannot resolve epage:\", epage);\n        frame.finish(null);\n      },\n    );\n  }\n\n  getEPageFromPosition(position: Position): Task.Result<number> {\n    const item = this.spine[position.spineIndex];\n    if (this.epageIsRenderedPage) {\n      const epage = item.epage + position.pageIndex;\n      return Task.newResult(epage);\n    }\n    if (position.offsetInItem <= 0) {\n      return Task.newResult(item.epage);\n    }\n    const frame: Task.Frame<number> = Task.newFrame(\"getEPage\");\n    this.store.load(item.src).then((xmldoc: XmlDoc.XMLDocHolder) => {\n      const totalOffset = xmldoc.getTotalOffset();\n      const offset = Math.min(totalOffset, position.offsetInItem);\n      frame.finish(item.epage + (offset * item.epageCount) / totalOffset);\n    });\n    return frame.result();\n  }\n}\n\nexport type PageAndPosition = {\n  page: Vtree.Page;\n  position: Position;\n};\n\nexport const makePageAndPosition = (\n  page: Vtree.Page,\n  pageIndex: number,\n): PageAndPosition => ({\n  page,\n  position: {\n    spineIndex: page.spineIndex,\n    pageIndex,\n    offsetInItem: page.offset,\n  },\n});\n\nexport type OPFViewItem = {\n  item: OPFItem;\n  xmldoc: XmlDoc.XMLDocHolder;\n  instance: OPS.StyleInstance;\n  layoutPositions: Vtree.LayoutPosition[];\n  pages: Vtree.Page[];\n  complete: boolean;\n};\n\nexport class OPFView implements Vgen.CustomRendererFactory {\n  spineItems: OPFViewItem[] = [];\n  spineItemLoadingContinuations: Task.Continuation<any>[][] = [];\n  pref: Exprs.Preferences;\n  clientLayout: Vgen.DefaultClientLayout;\n  counterStore: Counters.CounterStore;\n  tocAutohide: boolean = false;\n  tocView?: Toc.TOCView;\n\n  constructor(\n    public readonly opf: OPFDoc,\n    public readonly viewport: Vgen.Viewport,\n    public readonly fontMapper: Font.Mapper,\n    pref: Exprs.Preferences,\n    public readonly pageSheetSizeReporter: (\n      p1: { width: number; height: number },\n      p2: { [key: string]: { width: number; height: number } },\n      p3: number,\n      p4: number,\n    ) => any,\n  ) {\n    this.pref = Exprs.clonePreferences(pref);\n    this.clientLayout = new Vgen.DefaultClientLayout(viewport);\n    this.counterStore = new Counters.CounterStore(opf.documentURLTransformer);\n  }\n\n  private getPage(position: Position): Vtree.Page {\n    const viewItem = this.spineItems[position.spineIndex];\n    return viewItem ? viewItem.pages[position.pageIndex] : null;\n  }\n\n  getCurrentPageProgression(\n    position: Position,\n  ): Constants.PageProgression | null {\n    if (this.opf.pageProgression) {\n      return this.opf.pageProgression;\n    } else {\n      const viewItem = this.spineItems[position ? position.spineIndex : 0];\n      return viewItem ? viewItem.instance.pageProgression : null;\n    }\n  }\n\n  private finishPageContainer(\n    viewItem: OPFViewItem,\n    page: Vtree.Page,\n    pageIndex: number,\n  ) {\n    page.container.style.display = \"none\";\n    page.container.style.visibility = \"visible\";\n    page.container.style.position = \"\";\n    page.container.style.top = \"\";\n    page.container.style.left = \"\";\n    page.container.setAttribute(\n      \"data-vivliostyle-page-side\",\n      page.side as string,\n    );\n    const oldPage = viewItem.pages[pageIndex];\n    page.isFirstPage = viewItem.item.spineIndex == 0 && pageIndex == 0;\n    viewItem.pages[pageIndex] = page;\n\n    if (this.opf.epageIsRenderedPage) {\n      if (pageIndex == 0 && viewItem.item.spineIndex > 0) {\n        const prevItem = this.opf.spine[viewItem.item.spineIndex - 1];\n        viewItem.item.epage = prevItem.epage + prevItem.epageCount;\n      }\n      viewItem.item.epageCount = viewItem.pages.length;\n      this.opf.epageCount = this.opf.spine.reduce(\n        (count, item) => count + item.epageCount,\n        0,\n      );\n\n      if (this.opf.epageCountCallback) {\n        this.opf.epageCountCallback(this.opf.epageCount);\n      }\n    }\n\n    if (oldPage) {\n      viewItem.instance.viewport.contentContainer.replaceChild(\n        page.container,\n        oldPage.container,\n      );\n      oldPage.dispatchEvent({\n        type: \"replaced\",\n        target: null,\n        currentTarget: null,\n        preventDefault: null,\n        newPage: page,\n      });\n    } else {\n      // Find insert position in contentContainer.\n      let insertPos: Element | null = null;\n      if (pageIndex > 0) {\n        insertPos = viewItem.pages[pageIndex - 1].container.nextElementSibling;\n      } else {\n        for (\n          let i = viewItem.item.spineIndex + 1;\n          i < this.spineItems.length;\n          i++\n        ) {\n          const item = this.spineItems[i];\n          if (item && item.pages[0]) {\n            insertPos = item.pages[0].container;\n            break;\n          }\n        }\n      }\n      viewItem.instance.viewport.contentContainer.insertBefore(\n        page.container,\n        insertPos,\n      );\n    }\n    this.pageSheetSizeReporter(\n      {\n        width: viewItem.instance.pageSheetWidth,\n        height: viewItem.instance.pageSheetHeight,\n      },\n      viewItem.instance.pageSheetSize,\n      viewItem.item.spineIndex,\n      viewItem.instance.pageNumberOffset + pageIndex,\n    );\n  }\n\n  /**\n   * Render a single page. If the new page contains elements with ids that are\n   * referenced from other pages by 'target-counter()', those pages are rendered\n   * too (calling `renderSinglePage` recursively).\n   */\n  private renderSinglePage(\n    viewItem: OPFViewItem,\n    pos: Vtree.LayoutPosition,\n  ): Task.Result<RenderSinglePageResult> {\n    const frame: Task.Frame<RenderSinglePageResult> = Task.newFrame(\n      \"renderSinglePage\",\n    );\n    let page = this.makePage(viewItem, pos);\n    const self = this;\n    viewItem.instance.layoutNextPage(page, pos).then((posParam) => {\n      pos = posParam as Vtree.LayoutPosition;\n      const pageIndex = pos\n        ? pos.page - 1\n        : viewItem.layoutPositions.length - 1;\n      self.finishPageContainer(viewItem, page, pageIndex);\n      self.counterStore.finishPage(page.spineIndex, pageIndex);\n\n      // If the position of the page break change, we should re-layout the next\n      // page too.\n      let cont: Task.Result<any> = null;\n      if (pos) {\n        const prevPos = viewItem.layoutPositions[pos.page];\n        viewItem.layoutPositions[pos.page] = pos;\n        if (prevPos && viewItem.pages[pos.page]) {\n          if (!pos.isSamePosition(prevPos)) {\n            cont = self.renderSinglePage(viewItem, pos);\n          }\n        }\n      }\n      if (!cont) {\n        cont = Task.newResult(true);\n      }\n      cont.then(() => {\n        const unresolvedRefs = self.counterStore.getUnresolvedRefsToPage(page);\n        let index = 0;\n        frame\n          .loopWithFrame((loopFrame) => {\n            index++;\n            if (index > unresolvedRefs.length) {\n              loopFrame.breakLoop();\n              return;\n            }\n            const refs = unresolvedRefs[index - 1];\n            refs.refs = refs.refs.filter((ref) => !ref.isResolved());\n            if (refs.refs.length === 0) {\n              loopFrame.continueLoop();\n              return;\n            }\n            self.getPageViewItem(refs.spineIndex).then((viewItem) => {\n              if (!viewItem) {\n                loopFrame.continueLoop();\n                return;\n              }\n              self.counterStore.pushPageCounters(refs.pageCounters);\n              self.counterStore.pushReferencesToSolve(refs.refs);\n              const pos = viewItem.layoutPositions[refs.pageIndex];\n              self.renderSinglePage(viewItem, pos).then((result) => {\n                self.counterStore.popPageCounters();\n                self.counterStore.popReferencesToSolve();\n                const resultPosition = result.pageAndPosition.position;\n                if (\n                  resultPosition.spineIndex === page.spineIndex &&\n                  resultPosition.pageIndex === pageIndex\n                ) {\n                  page = result.pageAndPosition.page;\n                }\n                loopFrame.continueLoop();\n              });\n            });\n          })\n          .then(() => {\n            if (!page.container.parentElement) {\n              // page is replaced\n              page = viewItem.pages[pageIndex];\n            }\n            page.isLastPage =\n              !pos && viewItem.item.spineIndex === self.opf.spine.length - 1;\n            if (page.isLastPage) {\n              Asserts.assert(self.viewport);\n              self.counterStore.finishLastPage(self.viewport);\n            }\n            frame.finish({\n              pageAndPosition: makePageAndPosition(page, pageIndex),\n              nextLayoutPosition: pos,\n            });\n          });\n      });\n    });\n    return frame.result();\n  }\n\n  private normalizeSeekPosition(\n    position: Position,\n    viewItem: OPFViewItem,\n  ): Position | null {\n    let pageIndex = position.pageIndex;\n    let seekOffset = -1;\n    if (pageIndex < 0) {\n      seekOffset = position.offsetInItem;\n\n      // page with offset higher than seekOffset\n      const seekOffsetPageIndex = Base.binarySearch(\n        viewItem.layoutPositions.length,\n        (pageIndex) => {\n          // 'noLookAhead' argument of getPosition must be true, since\n          // otherwise StyleInstance.currentLayoutPosition is modified\n          // unintentionally.\n          const offset = viewItem.instance.getPosition(\n            viewItem.layoutPositions[pageIndex],\n            true,\n          );\n          return offset > seekOffset;\n        },\n      );\n      if (seekOffsetPageIndex === viewItem.layoutPositions.length) {\n        if (viewItem.complete) {\n          pageIndex = viewItem.layoutPositions.length - 1;\n        } else {\n          // need to search through pages that are not yet produced\n          pageIndex = Number.POSITIVE_INFINITY;\n        }\n      } else {\n        // page that contains seekOffset\n        pageIndex = seekOffsetPageIndex - 1;\n      }\n    } else if (\n      pageIndex === Number.POSITIVE_INFINITY &&\n      position.offsetInItem !== -1\n    ) {\n      seekOffset = position.offsetInItem;\n    }\n    return {\n      spineIndex: position.spineIndex,\n      pageIndex,\n      offsetInItem: seekOffset,\n    } as Position;\n  }\n\n  /**\n   * Find a page corresponding to a specified position among already laid out\n   * pages.\n   * @param sync If true, find the page synchronously (not waiting another\n   *     rendering task)\n   */\n  private findPage(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const self = this;\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\"findPage\");\n    self.getPageViewItem(position.spineIndex).then((viewItem) => {\n      if (!viewItem) {\n        frame.finish(null);\n        return;\n      }\n      let resultPage: Vtree.Page = null;\n      let pageIndex: number;\n      frame\n        .loopWithFrame((loopFrame) => {\n          const normalizedPosition = self.normalizeSeekPosition(\n            position,\n            viewItem,\n          );\n          pageIndex = normalizedPosition.pageIndex;\n          resultPage = viewItem.pages[pageIndex];\n          if (resultPage) {\n            loopFrame.breakLoop();\n          } else if (viewItem.complete) {\n            pageIndex = viewItem.layoutPositions.length - 1;\n            resultPage = viewItem.pages[pageIndex];\n            loopFrame.breakLoop();\n          } else if (sync) {\n            self.renderPage(normalizedPosition).then((result) => {\n              if (result) {\n                resultPage = result.page;\n                pageIndex = result.position.pageIndex;\n              }\n              loopFrame.breakLoop();\n            });\n          } else {\n            // Wait for the layout task and retry\n            frame.sleep(100).then(() => {\n              loopFrame.continueLoop();\n            });\n          }\n        })\n        .then(() => {\n          Asserts.assert(resultPage);\n          frame.finish(makePageAndPosition(resultPage, pageIndex));\n        });\n    });\n    return frame.result();\n  }\n\n  /**\n   * Renders a page at the specified position.\n   */\n  renderPage(position: Position): Task.Result<PageAndPosition | null> {\n    const self = this;\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\n      \"renderPage\",\n    );\n    self.getPageViewItem(position.spineIndex).then((viewItem) => {\n      if (!viewItem) {\n        frame.finish(null);\n        return;\n      }\n      const normalizedPosition = self.normalizeSeekPosition(position, viewItem);\n      let pageIndex = normalizedPosition.pageIndex;\n      const seekOffset = normalizedPosition.offsetInItem;\n      let resultPage = viewItem.pages[pageIndex];\n      if (resultPage) {\n        frame.finish(makePageAndPosition(resultPage, pageIndex));\n        return;\n      }\n      frame\n        .loopWithFrame((loopFrame) => {\n          if (pageIndex < viewItem.layoutPositions.length) {\n            loopFrame.breakLoop();\n            return;\n          }\n          if (viewItem.complete) {\n            pageIndex = viewItem.layoutPositions.length - 1;\n            loopFrame.breakLoop();\n            return;\n          }\n          let pos =\n            viewItem.layoutPositions[viewItem.layoutPositions.length - 1];\n          self.renderSinglePage(viewItem, pos).then((result) => {\n            const page = result.pageAndPosition.page;\n            pos = result.nextLayoutPosition;\n            if (pos) {\n              if (seekOffset >= 0) {\n                // Searching for offset, don't know the page number.\n                const offset = viewItem.instance.getPosition(pos);\n                if (offset > seekOffset) {\n                  resultPage = page;\n                  pageIndex = viewItem.layoutPositions.length - 2;\n                  loopFrame.breakLoop();\n                  return;\n                }\n              }\n              loopFrame.continueLoop();\n            } else {\n              resultPage = page;\n              pageIndex = result.pageAndPosition.position.pageIndex;\n              viewItem.complete = true;\n              loopFrame.breakLoop();\n            }\n          });\n        })\n        .then(() => {\n          resultPage = resultPage || viewItem.pages[pageIndex];\n          const pos = viewItem.layoutPositions[pageIndex];\n          if (resultPage) {\n            frame.finish(makePageAndPosition(resultPage, pageIndex));\n            return;\n          }\n          self.renderSinglePage(viewItem, pos).then((result) => {\n            if (!result.nextLayoutPosition) {\n              viewItem.complete = true;\n            }\n            frame.finish(result.pageAndPosition);\n          });\n        });\n    });\n    return frame.result();\n  }\n\n  renderAllPages(): Task.Result<PageAndPosition | null> {\n    return this.renderPagesUpto(\n      {\n        spineIndex: this.opf.spine.length - 1,\n        pageIndex: Number.POSITIVE_INFINITY,\n        offsetInItem: -1,\n      },\n      false,\n    );\n  }\n\n  /**\n   * Render pages from (spineIndex=0, pageIndex=0) to the specified (spineIndex,\n   * pageIndex).\n   * @param notAllPages If true, render from biginning of specified spine item.\n   */\n  renderPagesUpto(\n    position: Position,\n    notAllPages: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const self = this;\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\n      \"renderPagesUpto\",\n    );\n    if (!position) {\n      position = { spineIndex: 0, pageIndex: 0, offsetInItem: 0 };\n    }\n    const spineIndex = position.spineIndex;\n    const pageIndex = position.pageIndex;\n    let s = 0;\n\n    if (notAllPages) {\n      // Render pages from biginning of specified spine item.\n      s = spineIndex;\n    }\n\n    let lastResult: PageAndPosition;\n    frame\n      .loopWithFrame((loopFrame) => {\n        const pos = {\n          spineIndex: s,\n          pageIndex: s === spineIndex ? pageIndex : Number.POSITIVE_INFINITY,\n          offsetInItem: s === spineIndex ? position.offsetInItem : -1,\n        };\n        self.renderPage(pos).then((result) => {\n          lastResult = result;\n          if (++s > spineIndex) {\n            loopFrame.breakLoop();\n          } else {\n            loopFrame.continueLoop();\n          }\n        });\n      })\n      .then(() => {\n        frame.finish(lastResult);\n      });\n    return frame.result();\n  }\n\n  /**\n   * Move to the first page and render it.\n   */\n  firstPage(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    return this.findPage(\n      { spineIndex: 0, pageIndex: 0, offsetInItem: -1 },\n      sync,\n    );\n  }\n\n  /**\n   * Move to the last page and render it.\n   */\n  lastPage(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    return this.findPage(\n      {\n        spineIndex: this.opf.spine.length - 1,\n        pageIndex: Number.POSITIVE_INFINITY,\n        offsetInItem: -1,\n      },\n      sync,\n    );\n  }\n\n  /**\n   * Move to the next page position and render page.\n   * @param sync If true, get the page synchronously (not waiting another\n   *     rendering task)\n   */\n  nextPage(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const self = this;\n    let spineIndex = position.spineIndex;\n    let pageIndex = position.pageIndex;\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\"nextPage\");\n    self.getPageViewItem(spineIndex).then((viewItem) => {\n      if (!viewItem) {\n        frame.finish(null);\n        return;\n      }\n      if (\n        viewItem.complete &&\n        pageIndex == viewItem.layoutPositions.length - 1\n      ) {\n        if (spineIndex >= self.opf.spine.length - 1) {\n          frame.finish(null);\n          return;\n        }\n        spineIndex++;\n        pageIndex = 0;\n\n        // Remove next viewItem if its first page has same side as the current page\n        // to avoid unpaired page.\n        const nextViewItem = this.spineItems[spineIndex];\n        const nextPage = nextViewItem && nextViewItem.pages[0];\n        const currentPage = viewItem.pages[viewItem.pages.length - 1];\n        if (nextPage && currentPage && nextPage.side == currentPage.side) {\n          nextViewItem.pages.forEach((page) => {\n            if (page.container) page.container.remove();\n          });\n          this.spineItems[spineIndex] = null;\n          this.spineItemLoadingContinuations[spineIndex] = null;\n        }\n      } else {\n        pageIndex++;\n      }\n      self\n        .findPage({ spineIndex, pageIndex, offsetInItem: -1 }, sync)\n        .thenFinish(frame);\n    });\n    return frame.result();\n  }\n\n  /**\n   * Move to the previous page and render it.\n   */\n  previousPage(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    let spineIndex = position.spineIndex;\n    let pageIndex = position.pageIndex;\n    if (pageIndex == 0) {\n      if (spineIndex == 0) {\n        return Task.newResult(null as PageAndPosition | null);\n      }\n      spineIndex--;\n      pageIndex = Number.POSITIVE_INFINITY;\n    } else {\n      pageIndex--;\n    }\n    return this.findPage({ spineIndex, pageIndex, offsetInItem: -1 }, sync);\n  }\n\n  /**\n   * @param page This page should be a currently displayed page.\n   */\n  private isRectoPage(page: Vtree.Page, position: Position): boolean {\n    const isLeft = page.side === Constants.PageSide.LEFT;\n    const isLTR =\n      this.getCurrentPageProgression(position) ===\n      Constants.PageProgression.LTR;\n    return (!isLeft && isLTR) || (isLeft && !isLTR);\n  }\n\n  /**\n   * Get a spread containing the currently displayed page.\n   * @param sync If true, get the spread synchronously (not waiting another\n   *     rendering task)\n   */\n  getSpread(position: Position, sync: boolean): Task.Result<Vtree.Spread> {\n    const frame: Task.Frame<Vtree.Spread> = Task.newFrame(\"getCurrentSpread\");\n    const page = this.getPage(position);\n    if (!page) {\n      return Task.newResult(\n        /** @type Vtree.Spread */\n        { left: null, right: null } as Vtree.Spread,\n      );\n    }\n    const isLeft = page.side === Constants.PageSide.LEFT;\n    let other: Task.Result<PageAndPosition>;\n    if (this.isRectoPage(page, position)) {\n      other = this.previousPage(position, sync);\n    } else {\n      other = this.nextPage(position, sync);\n    }\n    other.then((otherPageAndPosition) => {\n      // this page may be replaced during nextPage(), so get thisPage again.\n      const thisPage = this.getPage(position);\n\n      let otherPage = otherPageAndPosition && otherPageAndPosition.page;\n      if (otherPage && otherPage.side === thisPage.side) {\n        // otherPage must not be same side\n        otherPage = null;\n      }\n\n      if (isLeft) {\n        frame.finish({ left: thisPage, right: otherPage });\n      } else {\n        frame.finish({ left: otherPage, right: thisPage });\n      }\n    });\n    return frame.result();\n  }\n\n  /**\n   * Move to the next spread and render pages.\n   * @param sync If true, get the spread synchronously (not waiting another\n   *     rendering task)\n   * @returns The 'verso' page of the next spread.\n   */\n  nextSpread(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const page = this.getPage(position);\n    if (!page) {\n      return Task.newResult(null as PageAndPosition | null);\n    }\n    const isRecto = this.isRectoPage(page, position);\n    const next = this.nextPage(position, sync);\n    if (isRecto) {\n      return next;\n    } else {\n      const self = this;\n      return next.thenAsync((result) => {\n        if (result) {\n          if (result.page.side === page.side) {\n            // If same side, this is the next spread.\n            return next;\n          }\n          const next2 = self.nextPage(result.position, sync);\n          return next2.thenAsync((result2) => {\n            if (result2) {\n              return next2;\n            } else {\n              // If this is tha last spread, move to next page in the same spread.\n              return next;\n            }\n          });\n        } else {\n          return Task.newResult(null as PageAndPosition | null);\n        }\n      });\n    }\n  }\n\n  /**\n   * Move to the previous spread and render pages.\n   * @returns The 'recto' page of the previous spread.\n   */\n  previousSpread(\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const page = this.getPage(position);\n    if (!page) {\n      return Task.newResult(null as PageAndPosition | null);\n    }\n    const isRecto = this.isRectoPage(page, position);\n    const prev = this.previousPage(position, sync);\n    const oldPrevPageCont = page.container.previousElementSibling;\n    if (isRecto) {\n      const self = this;\n      return prev.thenAsync((result) => {\n        if (result) {\n          if (result.page.side === page.side) {\n            // If same side, this is the previous spread.\n            return prev;\n          }\n          if (result.page.container !== oldPrevPageCont) {\n            // If previous page is changed, return it.\n            return prev;\n          }\n          return self.previousPage(result.position, sync);\n        } else {\n          return Task.newResult(null as PageAndPosition | null);\n        }\n      });\n    } else {\n      return prev;\n    }\n  }\n\n  /**\n   * Move to the epage specified by the given number (zero-based) and render it.\n   */\n  navigateToEPage(\n    epage: number,\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\n      \"navigateToEPage\",\n    );\n    const self = this;\n    this.opf.resolveEPage(epage).then((position) => {\n      if (position) {\n        self.findPage(position, sync).thenFinish(frame);\n      } else {\n        frame.finish(null);\n      }\n    });\n    return frame.result();\n  }\n\n  /**\n   * Move to the page specified by the given CFI and render it.\n   */\n  navigateToFragment(\n    fragment: string,\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\n      \"navigateToCFI\",\n    );\n    const self = this;\n    self.opf.resolveFragment(fragment).then((position) => {\n      if (position) {\n        self.findPage(position, sync).thenFinish(frame);\n      } else {\n        frame.finish(null);\n      }\n    });\n    return frame.result();\n  }\n\n  /**\n   * Move to the page specified by the given URL and render it.\n   */\n  navigateTo(\n    href: string,\n    position: Position,\n    sync: boolean,\n  ): Task.Result<PageAndPosition | null> {\n    Logging.logger.debug(\"Navigate to\", href);\n    let path = this.opf.getPathFromURL(Base.stripFragment(href));\n    if (!path) {\n      if (this.opf.opfXML && href.match(/^#epubcfi\\(/)) {\n        // CFI fragment is \"relative\" to OPF.\n        path = this.opf.getPathFromURL(this.opf.opfXML.url);\n      } else if (href.charAt(0) === \"#\") {\n        const restored = this.opf.documentURLTransformer.restoreURL(href);\n        if (this.opf.opfXML) {\n          path = this.opf.getPathFromURL(restored[0]);\n          if (path == null) {\n            path = restored[0];\n          }\n        } else {\n          path = restored[0];\n        }\n        href = restored[0] + (restored[1] ? `#${restored[1]}` : \"\");\n      }\n      if (path == null) {\n        return Task.newResult(null as PageAndPosition | null);\n      }\n    }\n    const item = this.opf.itemMapByPath[path];\n    if (!item) {\n      if (\n        this.opf.opfXML &&\n        path == this.opf.getPathFromURL(this.opf.opfXML.url)\n      ) {\n        // CFI link?\n        const fragmentIndex = href.indexOf(\"#\");\n        if (fragmentIndex >= 0) {\n          return this.navigateToFragment(\n            href.substr(fragmentIndex + 1),\n            position,\n            sync,\n          );\n        }\n      }\n      return Task.newResult(null as PageAndPosition | null);\n    }\n    const frame: Task.Frame<PageAndPosition | null> = Task.newFrame(\n      \"navigateTo\",\n    );\n    const self = this;\n    self.getPageViewItem(item.spineIndex).then((viewItem) => {\n      if (!viewItem) {\n        frame.finish(null);\n        return;\n      }\n      const target = viewItem.xmldoc.getElement(href);\n      if (target) {\n        self\n          .findPage(\n            {\n              spineIndex: item.spineIndex,\n              pageIndex: -1,\n              offsetInItem: viewItem.xmldoc.getElementOffset(target),\n            },\n            sync,\n          )\n          .thenFinish(frame);\n      } else if (position.spineIndex !== item.spineIndex) {\n        // no fragment, different spine item\n        self\n          .findPage(\n            {\n              spineIndex: item.spineIndex,\n              pageIndex: 0,\n              offsetInItem: -1,\n            },\n            sync,\n          )\n          .thenFinish(frame);\n      } else {\n        frame.finish(null);\n      }\n    });\n    return frame.result();\n  }\n\n  makePage(viewItem: OPFViewItem, pos: Vtree.LayoutPosition): Vtree.Page {\n    const viewport = viewItem.instance.viewport;\n    const pageCont = viewport.document.createElement(\"div\") as HTMLElement;\n    pageCont.setAttribute(\"data-vivliostyle-page-container\", \"true\");\n    pageCont.setAttribute(\"role\", \"region\");\n    pageCont.style.position = \"absolute\";\n    pageCont.style.top = \"0\";\n    pageCont.style.left = \"0\";\n    if (!Constants.isDebug) {\n      pageCont.style.visibility = \"hidden\";\n      pageCont.setAttribute(\"aria-hidden\", \"true\");\n    }\n    viewport.layoutBox.appendChild(pageCont);\n    const bleedBox = viewport.document.createElement(\"div\") as HTMLElement;\n    bleedBox.setAttribute(\"data-vivliostyle-bleed-box\", \"true\");\n    pageCont.appendChild(bleedBox);\n    const page = new Vtree.Page(pageCont, bleedBox);\n    page.spineIndex = viewItem.item.spineIndex;\n    page.position = pos;\n    page.offset = viewItem.instance.getPosition(pos);\n    if (page.offset === 0) {\n      const id = this.opf.documentURLTransformer.transformFragment(\n        \"\",\n        viewItem.item.src,\n      );\n      bleedBox.setAttribute(\"id\", id);\n      page.registerElementWithId(bleedBox, id);\n    }\n    if (viewport !== this.viewport) {\n      const matrix = Exprs.letterbox(\n        this.viewport.width,\n        this.viewport.height,\n        viewport.width,\n        viewport.height,\n      );\n      const cssMatrix = CssParser.parseValue(\n        null,\n        new CssTokenizer.Tokenizer(matrix, null),\n        \"\",\n      );\n      page.delayedItems.push(\n        new Vtree.DelayedItem(pageCont, \"transform\", cssMatrix),\n      );\n    }\n    return page;\n  }\n\n  makeObjectView(\n    xmldoc: XmlDoc.XMLDocHolder,\n    srcElem: Element,\n    viewParent: Element,\n    computedStyle: { [key: string]: Css.Val },\n  ): Task.Result<Element> {\n    let data = srcElem.getAttribute(\"data\");\n    let result: Element | null = null;\n    if (data) {\n      data = Base.resolveURL(data, xmldoc.url);\n      let mediaType = srcElem.getAttribute(\"media-type\");\n      if (!mediaType) {\n        const path = this.opf.getPathFromURL(data);\n        if (path) {\n          const item = this.opf.itemMapByPath[path];\n          if (item) {\n            mediaType = item.mediaType;\n          }\n        }\n      }\n      if (mediaType) {\n        const handlerSrc = this.opf.bindings[mediaType];\n        if (handlerSrc) {\n          result = this.viewport.document.createElement(\"iframe\");\n          (result as HTMLElement).style.border = \"none\";\n          const srcParam = Base.lightURLEncode(data);\n          const typeParam = Base.lightURLEncode(mediaType);\n          const sb = new Base.StringBuffer();\n          sb.append(handlerSrc);\n          sb.append(\"?src=\");\n          sb.append(srcParam);\n          sb.append(\"&type=\");\n          sb.append(typeParam);\n          for (let c: Node = srcElem.firstChild; c; c = c.nextSibling) {\n            if (c.nodeType == 1) {\n              const ce = c as Element;\n              if (ce.localName == \"param\" && ce.namespaceURI == Base.NS.XHTML) {\n                const pname = ce.getAttribute(\"name\");\n                const pvalue = ce.getAttribute(\"value\");\n                if (pname && pvalue) {\n                  sb.append(\"&\");\n                  sb.append(encodeURIComponent(pname));\n                  sb.append(\"=\");\n                  sb.append(encodeURIComponent(pvalue));\n                }\n              }\n            }\n          }\n          result.setAttribute(\"src\", sb.toString());\n          const width = srcElem.getAttribute(\"width\");\n          if (width) {\n            result.setAttribute(\"width\", width);\n          }\n          const height = srcElem.getAttribute(\"height\");\n          if (height) {\n            result.setAttribute(\"height\", height);\n          }\n        }\n      }\n    }\n    if (!result) {\n      result = this.viewport.document.createElement(\"span\");\n      result.setAttribute(\"data-adapt-process-children\", \"true\");\n    }\n\n    // Need to cast because we need {Element}, not {!Element}\n    return Task.newResult(result as Element);\n  }\n\n  makeMathJaxView(\n    xmldoc: XmlDoc.XMLDocHolder,\n    srcElem: Element,\n    viewParent: Element,\n    computedStyle: { [key: string]: Css.Val },\n  ): Task.Result<Element> {\n    // See if MathJax installed, use it if it is.\n    const hub = getMathJaxHub();\n    if (hub) {\n      const doc = viewParent.ownerDocument;\n      const span = doc.createElement(\"span\");\n      viewParent.appendChild(span);\n      const clonedMath = doc.importNode(srcElem, true);\n      this.resolveURLsInMathML(clonedMath, xmldoc);\n      span.appendChild(clonedMath);\n      const queue = hub[\"queue\"];\n      queue[\"Push\"]([\"Typeset\", hub, span]);\n      const frame: Task.Frame<Element> = Task.newFrame(\"makeMathJaxView\");\n      const continuation = frame.suspend();\n      queue[\"Push\"](() => {\n        continuation.schedule(span);\n      });\n      return frame.result();\n    }\n    return Task.newResult(null as Element);\n  }\n\n  private resolveURLsInMathML(node: Node, xmldoc: XmlDoc.XMLDocHolder) {\n    if (node == null) {\n      return;\n    }\n    if (node.nodeType === 1 && (node as Element).tagName === \"mglyph\") {\n      const attrs = Array.from((node as Element).attributes);\n      for (const attr of attrs) {\n        if (attr.name !== \"src\") {\n          continue;\n        }\n        const newUrl = Base.resolveURL(attr.nodeValue, xmldoc.url);\n        if (attr.namespaceURI) {\n          (node as Element).setAttributeNS(\n            attr.namespaceURI,\n            attr.name,\n            newUrl,\n          );\n        } else {\n          (node as Element).setAttribute(attr.name, newUrl);\n        }\n      }\n    }\n    if (node.firstChild) {\n      this.resolveURLsInMathML(node.firstChild, xmldoc);\n    }\n    if (node.nextSibling) {\n      this.resolveURLsInMathML(node.nextSibling, xmldoc);\n    }\n  }\n\n  // TODO move makeSSEView to a more appropriate class (SSE XML content is not\n  // allowed in EPUB)\n  /**\n   * @param computedStyle\n   */\n  makeSSEView(\n    xmldoc: XmlDoc.XMLDocHolder,\n    srcElem: Element,\n    viewParent: Element,\n    computedStyle: { [key: string]: Css.Val },\n  ): Task.Result<Element> {\n    const doc = viewParent ? viewParent.ownerDocument : this.viewport.document;\n    const srcTagName = srcElem.localName;\n    let tagName: string;\n    switch (srcTagName) {\n      case \"t\":\n      case \"tab\":\n      case \"ec\":\n      case \"nt\":\n      case \"fraction\":\n      case \"comment\":\n      case \"mark\":\n        tagName = \"span\";\n        break;\n      case \"ruby\":\n      case \"rp\":\n      case \"rt\":\n        tagName = srcTagName;\n        break;\n      default:\n        tagName = \"div\";\n    }\n    const result = doc.createElement(tagName);\n    result.setAttribute(\"data-adapt-process-children\", \"true\");\n\n    // Need to cast because we need {Element}, not {!Element}\n    return Task.newResult(result as Element);\n  }\n\n  /**\n   * @override\n   */\n  makeCustomRenderer(xmldoc: XmlDoc.XMLDocHolder): Vgen.CustomRenderer {\n    const self = this;\n    return (\n      srcElem: Element,\n      viewParent: Element,\n      computedStyle: { [key: string]: Css.Val },\n    ): Task.Result<Element> => {\n      if (\n        srcElem.localName == \"object\" &&\n        srcElem.namespaceURI == Base.NS.XHTML\n      ) {\n        return self.makeObjectView(xmldoc, srcElem, viewParent, computedStyle);\n      } else if (srcElem.namespaceURI == Base.NS.MATHML) {\n        return self.makeMathJaxView(xmldoc, srcElem, viewParent, computedStyle);\n      } else if (srcElem.namespaceURI == Base.NS.SSE) {\n        return self.makeSSEView(xmldoc, srcElem, viewParent, computedStyle);\n      } else if (\n        (srcElem as HTMLElement).dataset &&\n        (srcElem as HTMLElement).dataset[\"mathTypeset\"] == \"true\"\n      ) {\n        return self.makeMathJaxView(xmldoc, srcElem, viewParent, computedStyle);\n      }\n      return Task.newResult(null as Element);\n    };\n  }\n\n  getPageViewItem(spineIndex: number): Task.Result<OPFViewItem> {\n    const self = this;\n    if (spineIndex === -1 || spineIndex >= self.opf.spine.length) {\n      return Task.newResult(null as OPFViewItem);\n    }\n    let viewItem = self.spineItems[spineIndex];\n    if (viewItem) {\n      return Task.newResult(viewItem);\n    }\n    const frame: Task.Frame<OPFViewItem> = Task.newFrame(\"getPageViewItem\");\n\n    // If loading for the item has already been started, suspend and wait for\n    // the result.\n    let loadingContinuations = this.spineItemLoadingContinuations[spineIndex];\n    if (loadingContinuations) {\n      const cont = frame.suspend();\n      loadingContinuations.push(cont);\n      return frame.result();\n    } else {\n      loadingContinuations = this.spineItemLoadingContinuations[\n        spineIndex\n      ] = [];\n    }\n    const item = self.opf.spine[spineIndex];\n    const store = self.opf.store;\n    store.load(item.src).then((xmldoc: XmlDoc.XMLDocHolder) => {\n      item.title = xmldoc.document.title;\n      const style = store.getStyleForDoc(xmldoc);\n      const customRenderer = self.makeCustomRenderer(xmldoc);\n      let viewport = self.viewport;\n      const viewportSize = style.sizeViewport(\n        viewport.width,\n        viewport.height,\n        viewport.fontSize,\n        self.pref,\n      );\n      if (\n        viewportSize.width != viewport.width ||\n        viewportSize.height != viewport.height ||\n        viewportSize.fontSize != viewport.fontSize\n      ) {\n        viewport = new Vgen.Viewport(\n          viewport.window,\n          viewportSize.fontSize,\n          viewport.root,\n          viewportSize.width,\n          viewportSize.height,\n        );\n      }\n      const previousViewItem = self.spineItems[spineIndex - 1];\n      let pageNumberOffset: number;\n      if (item.startPage !== null) {\n        pageNumberOffset = item.startPage - 1;\n      } else {\n        if (\n          spineIndex > 0 &&\n          (!previousViewItem || !previousViewItem.complete)\n        ) {\n          // When navigate to a new spine item skipping the previous items,\n          // give up calculate pageNumberOffset and use epage (or spineIndex if epage is unset).\n          pageNumberOffset = item.epage || spineIndex;\n          if (!self.opf.prePaginated && pageNumberOffset % 2 == 0) {\n            // Force to odd number to avoid unpaired page. (This is 0 based and even number is recto)\n            pageNumberOffset++;\n          }\n        } else {\n          pageNumberOffset = previousViewItem\n            ? previousViewItem.instance.pageNumberOffset +\n              previousViewItem.pages.length\n            : 0;\n        }\n        if (item.skipPagesBefore !== null) {\n          pageNumberOffset += item.skipPagesBefore;\n        }\n      }\n      self.counterStore.forceSetPageCounter(pageNumberOffset);\n      const instance = new OPS.StyleInstance(\n        style,\n        xmldoc,\n        self.opf.lang,\n        viewport,\n        self.clientLayout,\n        self.fontMapper,\n        customRenderer,\n        self.opf.fallbackMap,\n        pageNumberOffset,\n        self.opf.documentURLTransformer,\n        self.counterStore,\n        self.opf.pageProgression,\n      );\n      instance.pref = self.pref;\n\n      // For env(pub-title) and env(doc-title)\n      const pubTitles = self.opf.metadata && self.opf.metadata[metaTerms.title];\n      instance.pubTitle =\n        (pubTitles && pubTitles[0] && pubTitles[0][\"v\"]) || \"\";\n      instance.docTitle = item.title || \"\";\n\n      instance.init().then(() => {\n        viewItem = {\n          item,\n          xmldoc,\n          instance,\n          layoutPositions: [null],\n          pages: [],\n          complete: false,\n        };\n        self.spineItems[spineIndex] = viewItem;\n        frame.finish(viewItem);\n        loadingContinuations.forEach((c) => {\n          c.schedule(viewItem);\n        });\n      });\n    });\n    return frame.result();\n  }\n\n  removeRenderedPages() {\n    const items = this.spineItems;\n    for (const item of items) {\n      if (item) {\n        item.pages.splice(0);\n      }\n    }\n    this.viewport.clear();\n  }\n\n  /**\n   * Returns if at least one page has 'auto' size\n   */\n  hasAutoSizedPages(): boolean {\n    const items = this.spineItems;\n    for (const item of items) {\n      if (item) {\n        const pages = item.pages;\n        for (const page of pages) {\n          if (page.isAutoPageWidth && page.isAutoPageHeight) {\n            return true;\n          }\n        }\n      }\n    }\n    return false;\n  }\n\n  hasPages(): boolean {\n    return this.spineItems.some((item) => item && item.pages.length > 0);\n  }\n\n  showTOC(autohide: boolean): Task.Result<Vtree.Page> {\n    const opf = this.opf;\n    const toc = opf.xhtmlToc || opf.ncxToc;\n    this.tocAutohide = autohide;\n    if (!toc) {\n      return Task.newResult(null as Vtree.Page);\n    }\n    if (this.tocView && this.tocView.page) {\n      this.tocView.page.container.style.visibility = \"visible\";\n      this.tocView.page.container.setAttribute(\"aria-hidden\", \"false\");\n      return Task.newResult(this.tocView.page);\n    }\n    const frame: Task.Frame<Vtree.Page> = Task.newFrame(\"showTOC\");\n    if (!this.tocView) {\n      this.tocView = new Toc.TOCView(\n        opf.store,\n        toc.src,\n        opf.lang,\n        this.clientLayout,\n        this.fontMapper,\n        this.pref,\n        this,\n        opf.fallbackMap,\n        opf.documentURLTransformer,\n        this.counterStore,\n      );\n    }\n    const viewport = this.viewport;\n    const tocWidth = Math.min(350, Math.round(0.67 * viewport.width) - 16);\n    const tocHeight = viewport.height - 6;\n    const pageCont = viewport.document.createElement(\"div\") as HTMLElement;\n    viewport.root.appendChild(pageCont);\n    // pageCont.style.position = \"absolute\";\n    pageCont.style.visibility = \"hidden\";\n    // pageCont.style.left = \"3px\";\n    // pageCont.style.top = \"3px\";\n    pageCont.style.width = `${tocWidth + 10}px`;\n    pageCont.style.maxHeight = `${tocHeight}px`;\n    // pageCont.style.overflow = \"scroll\";\n    // pageCont.style.overflowX = \"hidden\";\n    // pageCont.style.background = \"rgba(248,248,248,0.9)\";\n    // pageCont.style[\"borderRadius\"] = \"2px\";\n    // pageCont.style[\"boxShadow\"] = \"1px 1px 2px rgba(0,0,0,0.4)\";\n\n    pageCont.setAttribute(\"data-vivliostyle-toc-box\", \"true\");\n    pageCont.setAttribute(\"role\", \"navigation\");\n\n    this.tocView\n      .showTOC(pageCont, viewport, tocWidth, tocHeight, this.viewport.fontSize)\n      .then((page) => {\n        pageCont.style.visibility = \"visible\";\n        pageCont.setAttribute(\"aria-hidden\", \"false\");\n        frame.finish(page);\n      });\n    return frame.result();\n  }\n\n  hideTOC(): void {\n    if (this.tocView) {\n      this.tocView.hideTOC();\n    }\n  }\n\n  isTOCVisible(): boolean {\n    return !!this.tocView && this.tocView.isTOCVisible();\n  }\n}\n\nexport interface RenderSinglePageResult {\n  pageAndPosition: PageAndPosition;\n  nextLayoutPosition: Vtree.LayoutPosition;\n}\n","/**\n * Copyright 2013 Google, Inc.\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2018 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview AdaptiveViewer - Viewer implementation.\n */\nimport * as Asserts from \"./asserts\";\nimport * as Base from \"./base\";\nimport * as Constants from \"./constants\";\nimport * as Epub from \"./epub\";\nimport * as Exprs from \"./exprs\";\nimport * as Font from \"./font\";\nimport * as Logging from \"./logging\";\nimport * as Plugin from \"./plugin\";\nimport * as Profile from \"./profile\";\nimport * as Task from \"./task\";\nimport * as TaskUtil from \"./task-util\";\nimport * as Vgen from \"./vgen\";\nimport * as Vtree from \"./vtree\";\n\nexport type Action = (p1: Base.JSON) => Task.Result<boolean>;\n\nexport type ViewportSize = {\n  marginLeft: number;\n  marginRight: number;\n  marginTop: number;\n  marginBottom: number;\n  width: number;\n  height: number;\n};\n\nexport const VIEWPORT_STATUS_ATTRIBUTE = \"data-vivliostyle-viewer-status\";\n\nexport const VIEWPORT_SPREAD_VIEW_ATTRIBUTE = \"data-vivliostyle-spread-view\";\n\n/**\n * @enum {string}\n */\nexport enum PageViewMode {\n  SINGLE_PAGE = \"singlePage\",\n  SPREAD = \"spread\",\n  AUTO_SPREAD = \"autoSpread\",\n}\n\nexport type SingleDocumentParam = {\n  url: string;\n  startPage: number | null;\n  skipPagesBefore: number | null;\n};\n\nexport class AdaptiveViewer {\n  fontMapper: Font.Mapper;\n  kick: () => void;\n  sendCommand: (p1: Base.JSON | string) => void;\n  resizeListener: () => void;\n  hyperlinkListener: Base.EventListener;\n  pageRuleStyleElement: HTMLElement;\n  pageSheetSizeAlreadySet: boolean = false;\n  renderTask: Task.Task | null = null;\n  actions: { [key: string]: Action };\n  readyState: Constants.ReadyState;\n  packageURL: string[];\n  opf: Epub.OPFDoc;\n  haveZipMetadata: boolean;\n  touchActive: boolean;\n  touchX: number;\n  touchY: number;\n  needResize: boolean;\n  needRefresh: boolean;\n  viewportSize: ViewportSize | null;\n  currentPage: Vtree.Page;\n  currentSpread: Vtree.Spread | null;\n  pagePosition: Epub.Position | null;\n  fontSize: number;\n  zoom: number;\n  fitToScreen: boolean;\n  pageViewMode: PageViewMode;\n  waitForLoading: boolean;\n  renderAllPages: boolean;\n  pref: Exprs.Preferences;\n  pageSizes: { width: number; height: number }[];\n\n  // force relayout\n  viewport: Vgen.Viewport | null;\n  opfView: Epub.OPFView;\n\n  constructor(\n    public readonly window: Window,\n    public readonly viewportElement: HTMLElement,\n    public readonly instanceId: string,\n    public readonly callbackFn: (p1: Base.JSON) => void,\n  ) {\n    const self = this;\n    viewportElement.setAttribute(\"data-vivliostyle-viewer-viewport\", true);\n    if (Constants.isDebug) {\n      viewportElement.setAttribute(\"data-vivliostyle-debug\", true);\n    }\n    viewportElement.setAttribute(VIEWPORT_STATUS_ATTRIBUTE, \"loading\");\n    const document = window.document;\n    this.fontMapper = new Font.Mapper(document.head, viewportElement);\n    this.init();\n    this.kick = () => {};\n    this.sendCommand = () => {};\n    this.resizeListener = () => {\n      self.needResize = true;\n      self.kick();\n    };\n    this.pageReplacedListener = this.pageReplacedListener.bind(this);\n    this.hyperlinkListener = (evt) => {};\n    this.pageRuleStyleElement = document.getElementById(\n      \"vivliostyle-page-rules\",\n    );\n    this.actions = {\n      loadPublication: this.loadPublication,\n      loadXML: this.loadXML,\n      configure: this.configure,\n      moveTo: this.moveTo,\n      toc: this.showTOC,\n    };\n    this.addLogListeners();\n  }\n\n  private init(): void {\n    this.readyState = Constants.ReadyState.LOADING;\n    this.packageURL = [];\n    this.opf = null;\n    this.haveZipMetadata = false;\n    this.touchActive = false;\n    this.touchX = 0;\n    this.touchY = 0;\n    this.needResize = false;\n    this.needRefresh = false;\n    this.viewportSize = null;\n    this.currentPage = null;\n    this.currentSpread = null;\n    this.pagePosition = null;\n    this.fontSize = 16;\n    this.zoom = 1;\n    this.fitToScreen = false;\n    this.pageViewMode = PageViewMode.SINGLE_PAGE;\n    this.waitForLoading = false;\n    this.renderAllPages = true;\n    this.pref = Exprs.defaultPreferences();\n    this.pageSizes = [];\n  }\n\n  addLogListeners() {\n    const logLevel = Logging.LogLevel;\n    Logging.logger.addListener(logLevel.DEBUG, (info) => {\n      this.callback({ t: \"debug\", content: info });\n    });\n    Logging.logger.addListener(logLevel.INFO, (info) => {\n      this.callback({ t: \"info\", content: info });\n    });\n    Logging.logger.addListener(logLevel.WARN, (info) => {\n      this.callback({ t: \"warn\", content: info });\n    });\n    Logging.logger.addListener(logLevel.ERROR, (info) => {\n      this.callback({ t: \"error\", content: info });\n    });\n  }\n\n  private callback(message: Base.JSON): void {\n    message[\"i\"] = this.instanceId;\n    this.callbackFn(message);\n  }\n\n  /**\n   * Set readyState and notify to listeners\n   */\n  setReadyState(readyState: Constants.ReadyState) {\n    if (this.readyState !== readyState) {\n      this.readyState = readyState;\n      this.viewportElement.setAttribute(VIEWPORT_STATUS_ATTRIBUTE, readyState);\n      this.callback({ t: \"readystatechange\" });\n    }\n  }\n\n  loadPublication(command: Base.JSON): Task.Result<boolean> {\n    Profile.profiler.registerStartTiming(\"beforeRender\");\n    this.setReadyState(Constants.ReadyState.LOADING);\n    const url = command[\"url\"] as string;\n    const fragment = command[\"fragment\"] as string | null;\n    const haveZipMetadata = !!command[\"zipmeta\"];\n    const authorStyleSheet = command[\"authorStyleSheet\"] as {\n      url: string | null;\n      text: string | null;\n    }[];\n    const userStyleSheet = command[\"userStyleSheet\"] as {\n      url: string | null;\n      text: string | null;\n    }[];\n    this.viewport = null;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"loadPublication\");\n    const self = this;\n    self.configure(command).then(() => {\n      const store = new Epub.EPUBDocStore();\n      store.init(authorStyleSheet, userStyleSheet).then(() => {\n        const pubURL = Base.resolveURL(\n          Base.convertSpecialURL(url),\n          self.window.location.href,\n        );\n        self.packageURL = [pubURL];\n        store.loadPubDoc(pubURL, haveZipMetadata).then((opf) => {\n          if (opf) {\n            self.opf = opf;\n            self.render(fragment).then(() => {\n              frame.finish(true);\n            });\n          } else {\n            frame.finish(false);\n          }\n        });\n      });\n    });\n    return frame.result();\n  }\n\n  loadXML(command: Base.JSON): Task.Result<boolean> {\n    Profile.profiler.registerStartTiming(\"beforeRender\");\n    this.setReadyState(Constants.ReadyState.LOADING);\n    const params: SingleDocumentParam[] = command[\"url\"];\n    const doc = command[\"document\"] as Document;\n    const fragment = command[\"fragment\"] as string | null;\n    const authorStyleSheet = command[\"authorStyleSheet\"] as {\n      url: string | null;\n      text: string | null;\n    }[];\n    const userStyleSheet = command[\"userStyleSheet\"] as {\n      url: string | null;\n      text: string | null;\n    }[];\n\n    // force relayout\n    this.viewport = null;\n    const frame: Task.Frame<boolean> = Task.newFrame(\"loadXML\");\n    const self = this;\n    self.configure(command).then(() => {\n      const store = new Epub.EPUBDocStore();\n      store.init(authorStyleSheet, userStyleSheet).then(() => {\n        const resolvedParams: Epub.OPFItemParam[] = params.map((p, index) => ({\n          url: Base.resolveURL(\n            Base.convertSpecialURL(p.url),\n            self.window.location.href,\n          ),\n          index,\n          startPage: p.startPage,\n          skipPagesBefore: p.skipPagesBefore,\n        }));\n        self.packageURL = resolvedParams.map((p) => p.url);\n        self.opf = new Epub.OPFDoc(store, \"\");\n        self.opf.initWithChapters(resolvedParams, doc).then(() => {\n          self.render(fragment).then(() => {\n            frame.finish(true);\n          });\n        });\n      });\n    });\n    return frame.result();\n  }\n\n  private render(fragment?: string | null): Task.Result<boolean> {\n    this.cancelRenderingTask();\n    const self = this;\n    let cont: Task.Result<boolean>;\n    if (fragment) {\n      cont = this.opf.resolveFragment(fragment).thenAsync((position) => {\n        self.pagePosition = position;\n        return Task.newResult(true);\n      });\n    } else {\n      cont = Task.newResult(true);\n    }\n    return cont.thenAsync(() => {\n      Profile.profiler.registerEndTiming(\"beforeRender\");\n      return self.resize();\n    });\n  }\n\n  private resolveLength(specified: string): number {\n    const value = parseFloat(specified);\n    const unitPattern = /[a-z]+$/;\n    let matched: RegExpMatchArray;\n    if (\n      typeof specified === \"string\" &&\n      (matched = specified.match(unitPattern))\n    ) {\n      const unit = matched[0];\n      if (unit === \"em\" || unit === \"rem\") {\n        return value * this.fontSize;\n      }\n      if (unit === \"ex\") {\n        return (\n          (value * Exprs.defaultUnitSizes[\"ex\"] * this.fontSize) /\n          Exprs.defaultUnitSizes[\"em\"]\n        );\n      }\n      const unitSize = Exprs.defaultUnitSizes[unit];\n      if (unitSize) {\n        return value * unitSize;\n      }\n    }\n    return value;\n  }\n\n  configure(command: Base.JSON): Task.Result<boolean> {\n    if (typeof command[\"autoresize\"] == \"boolean\") {\n      if (command[\"autoresize\"]) {\n        this.viewportSize = null;\n        this.window.addEventListener(\"resize\", this.resizeListener, false);\n        this.needResize = true;\n      } else {\n        this.window.removeEventListener(\"resize\", this.resizeListener, false);\n      }\n    }\n    if (typeof command[\"fontSize\"] == \"number\") {\n      const fontSize = command[\"fontSize\"] as number;\n      if (fontSize >= 5 && fontSize <= 72 && this.fontSize != fontSize) {\n        this.fontSize = fontSize;\n        this.needResize = true;\n      }\n    }\n    if (typeof command[\"viewport\"] == \"object\" && command[\"viewport\"]) {\n      const vp = command[\"viewport\"];\n      const viewportSize = {\n        marginLeft: this.resolveLength(vp[\"margin-left\"]) || 0,\n        marginRight: this.resolveLength(vp[\"margin-right\"]) || 0,\n        marginTop: this.resolveLength(vp[\"margin-top\"]) || 0,\n        marginBottom: this.resolveLength(vp[\"margin-bottom\"]) || 0,\n        width: this.resolveLength(vp[\"width\"]) || 0,\n        height: this.resolveLength(vp[\"height\"]) || 0,\n      };\n      if (viewportSize.width >= 200 || viewportSize.height >= 200) {\n        this.window.removeEventListener(\"resize\", this.resizeListener, false);\n        this.viewportSize = viewportSize;\n        this.needResize = true;\n      }\n    }\n    if (typeof command[\"hyphenate\"] == \"boolean\") {\n      this.pref.hyphenate = command[\"hyphenate\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"horizontal\"] == \"boolean\") {\n      this.pref.horizontal = command[\"horizontal\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"nightMode\"] == \"boolean\") {\n      this.pref.nightMode = command[\"nightMode\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"lineHeight\"] == \"number\") {\n      this.pref.lineHeight = command[\"lineHeight\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"columnWidth\"] == \"number\") {\n      this.pref.columnWidth = command[\"columnWidth\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"fontFamily\"] == \"string\") {\n      this.pref.fontFamily = command[\"fontFamily\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"load\"] == \"boolean\") {\n      this.waitForLoading = command[\"load\"]; // Load images (and other resources) on the page.\n    }\n    if (typeof command[\"renderAllPages\"] == \"boolean\") {\n      this.renderAllPages = command[\"renderAllPages\"];\n    }\n    // for backward compatibility\n    if (typeof command[\"userAgentRootURL\"] == \"string\") {\n      Base.setBaseURL(command[\"userAgentRootURL\"].replace(/resources\\/?$/, \"\"));\n      Base.setResourceBaseURL(command[\"userAgentRootURL\"]);\n    }\n    if (typeof command[\"rootURL\"] == \"string\") {\n      Base.setBaseURL(command[\"rootURL\"]);\n      Base.setResourceBaseURL(`${Base.baseURL}resources/`);\n    }\n    if (\n      typeof command[\"pageViewMode\"] == \"string\" &&\n      command[\"pageViewMode\"] !== this.pageViewMode\n    ) {\n      this.pageViewMode = command[\"pageViewMode\"] as PageViewMode;\n      this.needResize = true;\n    }\n    if (\n      typeof command[\"pageBorder\"] == \"number\" &&\n      command[\"pageBorder\"] !== this.pref.pageBorder\n    ) {\n      // Force relayout\n      this.viewport = null;\n      this.pref.pageBorder = command[\"pageBorder\"];\n      this.needResize = true;\n    }\n    if (typeof command[\"zoom\"] == \"number\" && command[\"zoom\"] !== this.zoom) {\n      this.zoom = command[\"zoom\"];\n      this.needRefresh = true;\n    }\n    if (\n      typeof command[\"fitToScreen\"] == \"boolean\" &&\n      command[\"fitToScreen\"] !== this.fitToScreen\n    ) {\n      this.fitToScreen = command[\"fitToScreen\"];\n      this.needRefresh = true;\n    }\n    if (\n      typeof command[\"defaultPaperSize\"] == \"object\" &&\n      typeof command[\"defaultPaperSize\"].width == \"number\" &&\n      typeof command[\"defaultPaperSize\"].height == \"number\"\n    ) {\n      this.viewport = null;\n      this.pref.defaultPaperSize = command[\"defaultPaperSize\"];\n      this.needResize = true;\n    }\n    this.configurePlugins(command);\n    return Task.newResult(true);\n  }\n\n  configurePlugins(command: Base.JSON) {\n    const hooks: Plugin.ConfigurationHook[] = Plugin.getHooksForName(\n      Plugin.HOOKS.CONFIGURATION,\n    );\n    hooks.forEach((hook) => {\n      const result = hook(command);\n      this.needResize = result.needResize || this.needResize;\n      this.needRefresh = result.needRefresh || this.needRefresh;\n    });\n  }\n\n  /**\n   * Refresh view when a currently displayed page is replaced (by re-layout\n   * caused by cross reference resolutions)\n   */\n  pageReplacedListener(evt: Base.Event) {\n    const currentPage = this.currentPage;\n    const spread = this.currentSpread;\n    const target = evt.target;\n    if (spread) {\n      if (spread.left === target || spread.right === target) {\n        this.showCurrent(evt.newPage);\n      }\n    } else if (currentPage === evt.target) {\n      this.showCurrent(evt.newPage);\n    }\n  }\n\n  /**\n   * Iterate through currently displayed pages and do something\n   */\n  private forCurrentPages(fn: (p1: Vtree.Page) => any) {\n    const pages = [];\n    if (this.currentPage) {\n      pages.push(this.currentPage);\n    }\n    if (this.currentSpread) {\n      pages.push(this.currentSpread.left);\n      pages.push(this.currentSpread.right);\n    }\n    pages.forEach((page) => {\n      if (page) {\n        fn(page);\n      }\n    });\n  }\n\n  private removePageListeners() {\n    this.forCurrentPages((page) => {\n      page.removeEventListener(\"hyperlink\", this.hyperlinkListener, false);\n      page.removeEventListener(\"replaced\", this.pageReplacedListener, false);\n    });\n  }\n\n  /**\n   * Hide current pages (this.currentPage, this.currentSpread)\n   */\n  private hidePages() {\n    this.removePageListeners();\n    this.forCurrentPages((page) => {\n      Base.setCSSProperty(page.container, \"display\", \"none\");\n      page.container.setAttribute(\"aria-hidden\", \"true\");\n    });\n    this.currentPage = null;\n    this.currentSpread = null;\n  }\n\n  private showSinglePage(page: Vtree.Page) {\n    page.addEventListener(\"hyperlink\", this.hyperlinkListener, false);\n    page.addEventListener(\"replaced\", this.pageReplacedListener, false);\n    Base.setCSSProperty(page.container, \"visibility\", \"visible\");\n    Base.setCSSProperty(page.container, \"display\", \"block\");\n    page.container.setAttribute(\"aria-hidden\", \"false\");\n  }\n\n  private showPage(page: Vtree.Page): void {\n    this.hidePages();\n    this.currentPage = page;\n    page.container.style.marginLeft = \"\";\n    page.container.style.marginRight = \"\";\n    this.showSinglePage(page);\n  }\n\n  private showSpread(spread: Vtree.Spread) {\n    this.hidePages();\n    this.currentSpread = spread;\n    if (spread.left && spread.right) {\n      // Adjust spread horizontal alignment when left/right page widths differ\n      let leftWidth = parseFloat(spread.left.container.style.width);\n      let rightWidth = parseFloat(spread.right.container.style.width);\n      if (leftWidth && rightWidth && leftWidth !== rightWidth) {\n        if (leftWidth < rightWidth) {\n          spread.left.container.style.marginLeft = `${rightWidth -\n            leftWidth}px`;\n        } else {\n          spread.right.container.style.marginRight = `${leftWidth -\n            rightWidth}px`;\n        }\n      }\n    }\n    if (spread.left) {\n      this.showSinglePage(spread.left);\n      if (!spread.right) {\n        spread.left.container.setAttribute(\n          \"data-vivliostyle-unpaired-page\",\n          true,\n        );\n      } else {\n        spread.left.container.removeAttribute(\"data-vivliostyle-unpaired-page\");\n      }\n    }\n    if (spread.right) {\n      this.showSinglePage(spread.right);\n      if (!spread.left) {\n        spread.right.container.setAttribute(\n          \"data-vivliostyle-unpaired-page\",\n          true,\n        );\n      } else {\n        spread.right.container.removeAttribute(\n          \"data-vivliostyle-unpaired-page\",\n        );\n      }\n    }\n  }\n\n  private reportPosition(): Task.Result<boolean> {\n    const frame: Task.Frame<boolean> = Task.newFrame(\"reportPosition\");\n    const self = this;\n    Asserts.assert(self.pagePosition);\n    self.opf\n      .getCFI(this.pagePosition.spineIndex, this.pagePosition.offsetInItem)\n      .then((cfi) => {\n        const page = self.currentPage;\n        const r =\n          self.waitForLoading && page.fetchers.length > 0\n            ? TaskUtil.waitForFetchers(page.fetchers)\n            : Task.newResult(true);\n        r.then(() => {\n          self.sendLocationNotification(page, cfi).thenFinish(frame);\n        });\n      });\n    return frame.result();\n  }\n\n  private createViewport(): Vgen.Viewport {\n    const viewportElement = this.viewportElement;\n    if (this.viewportSize) {\n      const vs = this.viewportSize;\n      viewportElement.style.marginLeft = `${vs.marginLeft}px`;\n      viewportElement.style.marginRight = `${vs.marginRight}px`;\n      viewportElement.style.marginTop = `${vs.marginTop}px`;\n      viewportElement.style.marginBottom = `${vs.marginBottom}px`;\n      return new Vgen.Viewport(\n        this.window,\n        this.fontSize,\n        viewportElement,\n        vs.width,\n        vs.height,\n      );\n    } else {\n      return new Vgen.Viewport(this.window, this.fontSize, viewportElement);\n    }\n  }\n\n  private resolveSpreadView(viewport: Vgen.Viewport): boolean {\n    switch (this.pageViewMode) {\n      case PageViewMode.SINGLE_PAGE:\n        return false;\n      case PageViewMode.SPREAD:\n        return true;\n      case PageViewMode.AUTO_SPREAD:\n      default:\n        // wide enough for a pair of pages of A/B paper sizes, but not too\n        // narrow\n        return viewport.width / viewport.height >= 1.45 && viewport.width > 800;\n    }\n  }\n\n  private updateSpreadView(spreadView: boolean) {\n    this.pref.spreadView = spreadView;\n    this.viewportElement.setAttribute(\n      VIEWPORT_SPREAD_VIEW_ATTRIBUTE,\n      spreadView.toString(),\n    );\n  }\n\n  private sizeIsGood(): boolean {\n    const viewport = this.createViewport();\n    const spreadView = this.resolveSpreadView(viewport);\n    const spreadViewChanged = this.pref.spreadView !== spreadView;\n    this.updateSpreadView(spreadView);\n    if (\n      this.viewportSize ||\n      !this.viewport ||\n      this.viewport.fontSize != this.fontSize\n    ) {\n      return false;\n    }\n    if (\n      !spreadViewChanged &&\n      viewport.width == this.viewport.width &&\n      viewport.height == this.viewport.height\n    ) {\n      return true;\n    }\n\n    if (\n      !spreadViewChanged &&\n      viewport.width == this.viewport.width &&\n      viewport.height != this.viewport.height &&\n      /Android|iPhone|iPad|iPod/.test(navigator.userAgent)\n    ) {\n      // On mobile browsers, the viewport height may change unexpectedly\n      // when soft keyboard appears or tab/address bar auto-hide occurs,\n      // so ignore resizing in this condition.\n      return true;\n    }\n\n    if (\n      this.opfView &&\n      this.opfView.hasPages() &&\n      !this.opfView.hasAutoSizedPages()\n    ) {\n      this.viewport.width = viewport.width;\n      this.viewport.height = viewport.height;\n      this.needRefresh = true;\n      return true;\n    }\n    return false;\n  }\n\n  private setPageSize(\n    pageSize: { width: number; height: number },\n    pageSheetSize: { [key: string]: { width: number; height: number } },\n    spineIndex: number,\n    pageIndex: number,\n  ) {\n    this.pageSizes[pageIndex] = pageSize;\n    this.setPageSizePageRules(pageSheetSize, spineIndex, pageIndex);\n  }\n\n  private setPageSizePageRules(\n    pageSheetSize: { [key: string]: { width: number; height: number } },\n    spineIndex: number,\n    pageIndex: number,\n  ) {\n    if (!this.pageSheetSizeAlreadySet && this.pageRuleStyleElement) {\n      let styleText = \"\";\n      Object.keys(pageSheetSize).forEach((selector) => {\n        styleText += `@page ${selector}{margin:0;size:`;\n        const size = pageSheetSize[selector];\n        styleText += `${size.width}px ${size.height}px;}`;\n      });\n      this.pageRuleStyleElement.textContent = styleText;\n      this.pageSheetSizeAlreadySet = true;\n    }\n  }\n\n  removePageSizePageRules() {\n    if (this.pageRuleStyleElement) {\n      this.pageRuleStyleElement.textContent = \"\";\n      this.pageSheetSizeAlreadySet = false;\n    }\n  }\n\n  private reset(): void {\n    let tocVisible = false;\n    let tocAutohide = false;\n    if (this.opfView) {\n      tocVisible = this.opfView.isTOCVisible();\n      tocAutohide = this.opfView.tocAutohide;\n      this.opfView.hideTOC();\n      this.opfView.removeRenderedPages();\n    }\n    this.removePageSizePageRules();\n    this.viewport = this.createViewport();\n    this.viewport.resetZoom();\n    this.opfView = new Epub.OPFView(\n      this.opf,\n      this.viewport,\n      this.fontMapper,\n      this.pref,\n      this.setPageSize.bind(this),\n    );\n    if (tocVisible) {\n      this.sendCommand({ a: \"toc\", v: \"show\", autohide: tocAutohide });\n    }\n  }\n\n  /**\n   * Show current page or spread depending on the setting\n   * (this.pref.spreadView).\n   * @param sync If true, get the necessary page synchronously (not waiting\n   *     another rendering task)\n   */\n  private showCurrent(page: Vtree.Page, sync?: boolean): Task.Result<null> {\n    this.needRefresh = false;\n    this.removePageListeners();\n    const self = this;\n    if (this.pref.spreadView) {\n      return this.opfView\n        .getSpread(this.pagePosition, sync)\n        .thenAsync((spread) => {\n          self.showSpread(spread);\n          self.setSpreadZoom(spread);\n          self.currentPage = page;\n          return Task.newResult(null);\n        });\n    } else {\n      this.showPage(page);\n      this.setPageZoom(page);\n      this.currentPage = page;\n      return Task.newResult(null);\n    }\n  }\n\n  setPageZoom(page: Vtree.Page) {\n    const zoom = this.getAdjustedZoomFactor(page.dimensions);\n    this.viewport.zoom(page.dimensions.width, page.dimensions.height, zoom);\n  }\n\n  setSpreadZoom(spread: Vtree.Spread) {\n    const dim = this.getSpreadDimensions(spread);\n    this.viewport.zoom(dim.width, dim.height, this.getAdjustedZoomFactor(dim));\n  }\n\n  /**\n   * @returns adjusted zoom factor\n   */\n  getAdjustedZoomFactor(pageDimension: {\n    width: number;\n    height: number;\n  }): number {\n    return this.fitToScreen\n      ? this.calculateZoomFactorToFitInsideViewPort(pageDimension)\n      : this.zoom;\n  }\n\n  /**\n   * Returns width and height of the spread, including the margin between pages.\n   */\n  getSpreadDimensions(spread: Vtree.Spread): { width: number; height: number } {\n    let width = 0;\n    let height = 0;\n    if (spread.left) {\n      width += spread.left.dimensions.width;\n      height = spread.left.dimensions.height;\n    }\n    if (spread.right) {\n      width += spread.right.dimensions.width;\n      height = Math.max(height, spread.right.dimensions.height);\n    }\n    if (spread.left && spread.right) {\n      width += this.pref.pageBorder * 2;\n      // Adjust spread horizontal alignment when left/right page widths differ\n      width += Math.abs(\n        spread.left.dimensions.width - spread.right.dimensions.width,\n      );\n    }\n    return { width, height };\n  }\n\n  /**\n   * Returns zoom factor corresponding to the specified zoom type.\n   */\n  queryZoomFactor(type: ZoomType): number {\n    if (!this.currentPage) {\n      throw new Error(\"no page exists.\");\n    }\n    switch (type) {\n      case ZoomType.FIT_INSIDE_VIEWPORT: {\n        let pageDim: { width: number; height: number };\n        if (this.pref.spreadView) {\n          Asserts.assert(this.currentSpread);\n          pageDim = this.getSpreadDimensions(this.currentSpread);\n        } else {\n          pageDim = this.currentPage.dimensions;\n        }\n        return this.calculateZoomFactorToFitInsideViewPort(pageDim);\n      }\n      default:\n        throw new Error(`unknown zoom type: ${type}`);\n    }\n  }\n\n  /**\n   * @returns zoom factor to fit inside viewport\n   */\n  calculateZoomFactorToFitInsideViewPort(pageDimension: {\n    width: number;\n    height: number;\n  }): number {\n    const widthZoom = this.viewport.width / pageDimension.width;\n    const heightZoom = this.viewport.height / pageDimension.height;\n    return Math.min(widthZoom, heightZoom);\n  }\n\n  private cancelRenderingTask() {\n    if (this.renderTask) {\n      this.renderTask.interrupt(new RenderingCanceledError());\n    }\n    this.renderTask = null;\n  }\n\n  resize(): Task.Result<boolean> {\n    this.needResize = false;\n    this.needRefresh = false;\n    if (this.sizeIsGood()) {\n      return Task.newResult(true);\n    }\n    const self = this;\n    this.setReadyState(Constants.ReadyState.LOADING);\n    this.cancelRenderingTask();\n    const resizeTask = Task.currentTask()\n      .getScheduler()\n      .run(() =>\n        Task.handle(\n          \"resize\",\n          (frame) => {\n            if (!self.opf) {\n              frame.finish(false);\n              return;\n            }\n            self.renderTask = resizeTask;\n            Profile.profiler.registerStartTiming(\"render (resize)\");\n            self.reset();\n            if (self.pagePosition) {\n              // When resizing, do not use the current page index, for a page\n              // index corresponding to the current position in the document\n              // (offsetInItem) can change due to different layout caused by\n              // different viewport size.\n\n              // Update(2019-03): to avoid unexpected page move (first page to next),\n              // keep pageIndex == 0 when offsetInItem == 0\n              if (\n                !(\n                  self.pagePosition.pageIndex == 0 &&\n                  self.pagePosition.offsetInItem == 0\n                )\n              ) {\n                self.pagePosition.pageIndex = -1;\n              }\n            }\n\n            // epageCount counting depends renderAllPages mode\n            self.opf.setEPageCountMode(self.renderAllPages);\n\n            // With renderAllPages option specified, the rendering is\n            // performed after the initial page display, otherwise users are\n            // forced to wait the rendering finish in front of a blank page.\n            self.opfView\n              .renderPagesUpto(self.pagePosition, !self.renderAllPages)\n              .then((result) => {\n                if (!result) {\n                  frame.finish(false);\n                  return;\n                }\n                self.pagePosition = result.position;\n                self.showCurrent(result.page, true).then(() => {\n                  self.setReadyState(Constants.ReadyState.INTERACTIVE);\n\n                  self.opf\n                    .countEPages((epageCount) => {\n                      const notification = {\n                        t: \"nav\",\n                        epageCount: epageCount,\n                        first: self.currentPage.isFirstPage,\n                        last: self.currentPage.isLastPage,\n                        metadata: self.opf.metadata,\n                        docTitle:\n                          self.opf.spine[self.pagePosition.spineIndex].title,\n                      };\n                      if (\n                        self.currentPage.isFirstPage ||\n                        (self.pagePosition.pageIndex == 0 &&\n                          self.opf.spine[self.pagePosition.spineIndex].epage)\n                      ) {\n                        notification[\"epage\"] =\n                          self.opf.spine[self.pagePosition.spineIndex].epage;\n                      }\n                      self.callback(notification);\n                    })\n                    .then(() => {\n                      self.reportPosition().then((p) => {\n                        const r = self.renderAllPages\n                          ? self.opfView.renderAllPages()\n                          : Task.newResult(null);\n                        r.then(() => {\n                          if (self.renderTask === resizeTask) {\n                            self.renderTask = null;\n                          }\n                          Profile.profiler.registerEndTiming(\"render (resize)\");\n                          if (self.renderAllPages) {\n                            self.setReadyState(Constants.ReadyState.COMPLETE);\n                          }\n                          self.callback({ t: \"loaded\" });\n                          frame.finish(p);\n                        });\n                      });\n                    });\n                });\n              });\n          },\n          (frame, err) => {\n            if (err instanceof RenderingCanceledError) {\n              Profile.profiler.registerEndTiming(\"render (resize)\");\n              Logging.logger.debug(err.message);\n            } else {\n              throw err;\n            }\n          },\n        ),\n      );\n    return Task.newResult(true);\n  }\n\n  private sendLocationNotification(\n    page: Vtree.Page,\n    cfi: string | null,\n  ): Task.Result<boolean> {\n    const frame: Task.Frame<boolean> = Task.newFrame(\n      \"sendLocationNotification\",\n    );\n    const notification = {\n      t: \"nav\",\n      first: page.isFirstPage,\n      last: page.isLastPage,\n      metadata: this.opf.metadata,\n      docTitle: this.opf.spine[page.spineIndex].title,\n    };\n    const self = this;\n    this.opf\n      .getEPageFromPosition(self.pagePosition as Epub.Position)\n      .then((epage) => {\n        notification[\"epage\"] = epage;\n        notification[\"epageCount\"] = self.opf.epageCount;\n        if (cfi) {\n          notification[\"cfi\"] = cfi;\n        }\n        self.callback(notification);\n        frame.finish(true);\n      });\n    return frame.result();\n  }\n\n  getCurrentPageProgression(): Constants.PageProgression | null {\n    return this.opfView\n      ? this.opfView.getCurrentPageProgression(this.pagePosition)\n      : null;\n  }\n\n  moveTo(command: Base.JSON): Task.Result<boolean> {\n    let method: () => Task.Result<Epub.PageAndPosition>;\n    const self = this;\n    if (\n      this.readyState !== Constants.ReadyState.COMPLETE &&\n      command[\"where\"] !== \"next\"\n    ) {\n      this.setReadyState(Constants.ReadyState.LOADING);\n    }\n    if (typeof command[\"where\"] == \"string\") {\n      let m: (\n        position: Epub.Position,\n        sync: boolean,\n      ) => Task.Result<Epub.PageAndPosition>;\n      switch (command[\"where\"]) {\n        case \"next\":\n          m = this.pref.spreadView\n            ? this.opfView.nextSpread\n            : this.opfView.nextPage;\n          break;\n        case \"previous\":\n          m = this.pref.spreadView\n            ? this.opfView.previousSpread\n            : this.opfView.previousPage;\n          break;\n        case \"last\":\n          m = this.opfView.lastPage;\n          break;\n        case \"first\":\n          m = this.opfView.firstPage;\n          break;\n        default:\n          return Task.newResult(true);\n      }\n      if (m) {\n        method = () =>\n          m.call(self.opfView, self.pagePosition, !self.renderAllPages);\n      }\n    } else if (typeof command[\"epage\"] == \"number\") {\n      const epage = command[\"epage\"] as number;\n      method = () =>\n        self.opfView.navigateToEPage(\n          epage,\n          self.pagePosition,\n          !self.renderAllPages,\n        );\n    } else if (typeof command[\"url\"] == \"string\") {\n      const url = command[\"url\"] as string;\n      method = () =>\n        self.opfView.navigateTo(url, self.pagePosition, !self.renderAllPages);\n    } else {\n      return Task.newResult(true);\n    }\n    const frame: Task.Frame<boolean> = Task.newFrame(\"moveTo\");\n    method.call(self.opfView).then((result) => {\n      let cont: Task.Result<boolean>;\n      if (result) {\n        self.pagePosition = result.position;\n        const innerFrame: Task.Frame<boolean> = Task.newFrame(\n          \"moveTo.showCurrent\",\n        );\n        cont = innerFrame.result();\n        self.showCurrent(result.page, !self.renderAllPages).then(() => {\n          self.reportPosition().thenFinish(innerFrame);\n        });\n      } else {\n        cont = Task.newResult(true);\n      }\n      cont.then((res) => {\n        if (self.readyState === Constants.ReadyState.LOADING) {\n          self.setReadyState(Constants.ReadyState.INTERACTIVE);\n        }\n        frame.finish(res);\n      });\n    });\n    return frame.result();\n  }\n\n  showTOC(command: Base.JSON): Task.Result<boolean> {\n    const autohide = !!command[\"autohide\"];\n    const visibility = command[\"v\"];\n    const currentVisibility = this.opfView.isTOCVisible();\n    const changeAutohide =\n      autohide != this.opfView.tocAutohide && visibility != \"hide\";\n    if (currentVisibility) {\n      if (visibility == \"show\" && !changeAutohide) {\n        return Task.newResult(true);\n      }\n    } else {\n      if (visibility == \"hide\") {\n        return Task.newResult(true);\n      }\n    }\n    if (currentVisibility && visibility != \"show\") {\n      this.opfView.hideTOC();\n      return Task.newResult(true);\n    } else {\n      const self = this;\n      const frame: Task.Frame<boolean> = Task.newFrame(\"showTOC\");\n      this.opfView.showTOC(autohide).then((page) => {\n        if (page) {\n          if (changeAutohide) {\n            page.listeners = {};\n          }\n          if (autohide) {\n            const hideTOC = () => {\n              self.opfView.hideTOC();\n            };\n            page.addEventListener(\"hyperlink\", hideTOC, false);\n            // page.container.addEventListener(\"click\", hideTOC, false);\n          }\n          page.addEventListener(\"hyperlink\", self.hyperlinkListener, false);\n        }\n        frame.finish(true);\n      });\n      return frame.result();\n    }\n  }\n\n  runCommand(command: Base.JSON): Task.Result<boolean> {\n    const self = this;\n    const actionName = command[\"a\"] || \"\";\n    return Task.handle(\n      \"runCommand\",\n      (frame) => {\n        const action = self.actions[actionName];\n        if (action) {\n          action.call(self, command).then(() => {\n            self.callback({ t: \"done\", a: actionName });\n            frame.finish(true);\n          });\n        } else {\n          Logging.logger.error(\"No such action:\", actionName);\n          frame.finish(true);\n        }\n      },\n      (frame, err) => {\n        Logging.logger.error(err, \"Error during action:\", actionName);\n        frame.finish(true);\n      },\n    );\n  }\n\n  initEmbed(cmd: Base.JSON | string): void {\n    let command = maybeParse(cmd);\n    let continuation: Task.Continuation<boolean> | null = null;\n    const viewer = this;\n    Task.start(() => {\n      const frame: Task.Frame<boolean> = Task.newFrame(\"commandLoop\");\n      const scheduler = Task.currentTask().getScheduler();\n      viewer.hyperlinkListener = (evt) => {\n        const hrefEvent = evt as Vtree.PageHyperlinkEvent;\n        const internal =\n          hrefEvent.href.charAt(0) === \"#\" ||\n          viewer.packageURL.some(\n            (url) => hrefEvent.href.substr(0, url.length) == url,\n          );\n        if (internal) {\n          evt.preventDefault();\n          const msg = {\n            t: \"hyperlink\",\n            href: hrefEvent.href,\n            internal: internal,\n          };\n          scheduler.run(() => {\n            viewer.callback(msg);\n            return Task.newResult(true);\n          });\n        }\n      };\n      frame\n        .loopWithFrame((loopFrame) => {\n          if (viewer.needResize) {\n            viewer.resize().then(() => {\n              loopFrame.continueLoop();\n            });\n          } else if (viewer.needRefresh) {\n            if (viewer.currentPage) {\n              viewer.showCurrent(viewer.currentPage).then(() => {\n                loopFrame.continueLoop();\n              });\n            }\n          } else if (command) {\n            const cmd = command;\n            command = null;\n            viewer.runCommand(cmd).then(() => {\n              loopFrame.continueLoop();\n            });\n          } else {\n            const frameInternal: Task.Frame<boolean> = Task.newFrame(\n              \"waitForCommand\",\n            );\n            continuation = frameInternal.suspend(self);\n            frameInternal.result().then(() => {\n              loopFrame.continueLoop();\n            });\n          }\n        })\n        .thenFinish(frame);\n      return frame.result();\n    });\n    viewer.kick = () => {\n      const cont = continuation;\n      if (cont) {\n        continuation = null;\n        cont.schedule(true);\n      }\n    };\n    viewer.sendCommand = (cmd) => {\n      if (command) {\n        return false;\n      }\n      command = maybeParse(cmd);\n      viewer.kick();\n      return true;\n    };\n    this.window[\"adapt_command\"] = viewer.sendCommand;\n  }\n}\n\n/**\n * @enum {string}\n */\nexport enum ZoomType {\n  FIT_INSIDE_VIEWPORT = \"fit inside viewport\",\n}\n\n/**\n * Error representing that the rendering has been canceled.\n */\nclass RenderingCanceledError extends Error {\n  name: string = \"RenderingCanceledError\";\n  message: string = \"Page rendering has been canceled\";\n  stack: string;\n\n  constructor() {\n    super();\n    // Set the prototype explicitly.\n    // https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work\n    Object.setPrototypeOf(this, RenderingCanceledError.prototype);\n    this.stack = new Error().stack;\n  }\n}\n\nexport function maybeParse(cmd: any): Base.JSON {\n  if (typeof cmd == \"string\") {\n    return Base.stringToJSON(cmd);\n  }\n  return cmd;\n}\n","/**\n * Copyright 2015 Trim-marks Inc.\n * Copyright 2018 Vivliostyle Foundation\n *\n * Vivliostyle.js is free software: you can redistribute it and/or modify\n * it under the terms of the GNU Affero General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * Vivliostyle.js is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n * GNU Affero General Public License for more details.\n *\n * You should have received a copy of the GNU Affero General Public License\n * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.\n *\n * @fileoverview CoreViewer - Vivliostyle CoreViewer class\n */\nimport * as AdaptiveViewer from \"./adaptive-viewer\";\nimport * as Base from \"./base\";\nimport * as Constants from \"./constants\";\nimport * as Profile from \"./profile\";\n\nexport interface Payload {\n  type: string;\n  internal: boolean;\n  href: string;\n  content: string;\n  cfi: string;\n  first: boolean;\n  last: boolean;\n  epage: unknown;\n  epageCount: number;\n  metadata: unknown;\n  docTitle: string;\n}\n\nconst PageProgression = Constants.PageProgression;\n\n/**\n * Viewer settings that must be passed to Viewer's constructor.\n * - userAgentRootURL: URL of a directory from which viewer resource files\n *   (under resources/ directory in the source repository) are served.\n * - viewportElement: An element used as the viewport of the displayed contents.\n * - window: Window object. If omitted, current `window` is used.\n * - debug: Debug flag.\n */\nexport type CoreViewerSettings = {\n  userAgentRootURL?: string;\n  viewportElement: HTMLElement;\n  window?: Window;\n  debug?: boolean;\n};\n\n/**\n * Viewer options that can be set after the Viewer object is constructed.\n * - autoResize: Run layout again when the window is resized. default: true\n * - fontSize: Default font size (px). default: 16\n * - pageBorderWidth: Width of a border between two pages in a single\n *   spread (px). Effective only in spread view mode. default: 1\n * - renderAllPages: Render all pages at the document load time. default: true\n * - pageViewMode: Page view mode (singlePage / spread / autoSpread).\n *   default: singlePage\n * - zoom: Zoom factor with which pages are displayed. default: 1\n * - fitToScreen: Auto adjust zoom factor to fit the screen. default: false\n * - defaultPaperSize: Default paper size in px. Effective when `@page` size\n *   is set to auto. default: undefined (means the windows size is used as\n *   paper size).\n */\nexport type CoreViewerOptions = {\n  autoResize?: boolean;\n  fontSize?: number;\n  pageBorderWidth?: number;\n  renderAllPages?: boolean;\n  pageViewMode?: AdaptiveViewer.PageViewMode;\n  zoom?: number;\n  fitToScreen?: boolean;\n  defaultPaperSize?: { width: number; height: number };\n};\n\nfunction getDefaultViewerOptions(): CoreViewerOptions {\n  return {\n    autoResize: true,\n    fontSize: 16,\n    pageBorderWidth: 1,\n    renderAllPages: true,\n    pageViewMode: AdaptiveViewer.PageViewMode.AUTO_SPREAD,\n    zoom: 1,\n    fitToScreen: false,\n    defaultPaperSize: undefined,\n  };\n}\n\nfunction convertViewerOptions(options: CoreViewerOptions): object {\n  const converted = {};\n  Object.keys(options).forEach((key) => {\n    const v = options[key];\n    switch (key) {\n      case \"autoResize\":\n        converted[\"autoresize\"] = v;\n        break;\n      case \"pageBorderWidth\":\n        converted[\"pageBorder\"] = v;\n        break;\n      default:\n        converted[key] = v;\n    }\n  });\n  return converted;\n}\n\n/**\n * Options for the displayed document.\n * - documentObject: Document object for the document. If provided, it is used\n *   directly without parsing the source again.\n * - fragment: Fragmentation identifier (EPUB CFI) of the location in the\n *   document which is to be displayed.\n * - authorStyleSheet: An array of author style sheets to be injected after all\n *   author style sheets referenced from the document. A single stylesheet may\n *   be a URL of the style sheet or a text content of the style sheet.\n * - userStyleSheet: An array of user style sheets to be injected.\n *   A single stylesheet may be a URL of the style sheet or a text content of\n *   the style sheet.\n */\nexport type DocumentOptions = {\n  documentObject?: Document;\n  fragment?: string;\n  authorStyleSheet?: { url?: string; text?: string }[];\n  userStyleSheet?: { url?: string; text?: string }[];\n};\n\n/**\n * Options for a single source document.\n * - url: URL of the document.\n * - startPage: If specified, the `page` page-based counter is set to the\n *   specified value on the first page of the document. It is equivalent to\n *   specifying `counter-reset: page [specified value - 1]` on that page.\n * - skipPagesBefore: If specified, the `page` page-based counter is\n *   incremented by the specified value *before* updating page-based counters\n *   on the first page of the document.\n *   This option is ignored if `startPageNumber` option is also specified.\n */\nexport type SingleDocumentOptions =\n  | string\n  | {\n      url: string;\n      startPage?: number;\n      skipPagesBefore?: number;\n    };\n\n/**\n * Vivliostyle Viewer class.\n */\nexport class CoreViewer {\n  private initialized: boolean = false;\n  private adaptViewer_: AdaptiveViewer.AdaptiveViewer;\n  private options: CoreViewerOptions;\n  private eventTarget: Base.SimpleEventTarget;\n  readyState: Constants.ReadyState;\n\n  constructor(\n    private readonly settings: CoreViewerSettings,\n    opt_options?: CoreViewerOptions,\n  ) {\n    Constants.setDebug(settings.debug);\n    this.adaptViewer_ = new AdaptiveViewer.AdaptiveViewer(\n      settings[\"window\"] || window,\n      settings[\"viewportElement\"],\n      \"main\",\n      this.dispatcher.bind(this),\n    );\n    this.options = getDefaultViewerOptions();\n    if (opt_options) {\n      this.setOptions(opt_options);\n    }\n    this.eventTarget = new Base.SimpleEventTarget();\n    Object.defineProperty(this, \"readyState\", {\n      get() {\n        return this.adaptViewer_.readyState;\n      },\n    });\n  }\n\n  /**\n   * Set ViewerOptions to the viewer.\n   */\n  setOptions(options: CoreViewerOptions) {\n    const command = Object.assign(\n      { a: \"configure\" },\n      convertViewerOptions(options),\n    );\n    this.adaptViewer_.sendCommand(command);\n    Object.assign(this.options, options);\n  }\n\n  private dispatcher(msg: Base.JSON) {\n    /** @dict */\n    const event = { type: msg[\"t\"] };\n    const o = msg as object;\n    Object.keys(o).forEach((key) => {\n      if (key !== \"t\") {\n        event[key] = o[key];\n      }\n    });\n    this.eventTarget.dispatchEvent(event);\n  }\n\n  /**\n   * Add a listener function, which is invoked when the specified type of event\n   * is dispatched.\n   * @param type Event type.\n   * @param listener Listener function.\n   */\n  addListener(type: string, listener: (payload: Payload) => void) {\n    this.eventTarget.addEventListener(\n      type,\n      listener as Base.EventListener,\n      false,\n    );\n  }\n\n  /**\n   * Remove an event listener.\n   * @param type Event type.\n   * @param listener Listener function.\n   */\n  removeListener(type: string, listener: (payload: Payload) => void) {\n    this.eventTarget.removeEventListener(\n      type,\n      listener as Base.EventListener,\n      false,\n    );\n  }\n\n  /**\n   * Load an HTML or XML document(s).\n   */\n  loadDocument(\n    singleDocumentOptions: SingleDocumentOptions | SingleDocumentOptions[],\n    opt_documentOptions?: DocumentOptions,\n    opt_viewerOptions?: CoreViewerOptions,\n  ) {\n    if (!singleDocumentOptions) {\n      this.eventTarget.dispatchEvent({\n        type: \"error\",\n        content: \"No URL specified\",\n      });\n    }\n    this.loadDocumentOrPublication(\n      singleDocumentOptions,\n      null,\n      opt_documentOptions,\n      opt_viewerOptions,\n    );\n  }\n\n  /**\n   * Load an EPUB/WebPub publication.\n   */\n  loadPublication(\n    pubUrl: string,\n    opt_documentOptions?: DocumentOptions,\n    opt_viewerOptions?: CoreViewerOptions,\n  ) {\n    if (!pubUrl) {\n      this.eventTarget.dispatchEvent({\n        type: \"error\",\n        content: \"No URL specified\",\n      });\n    }\n    this.loadDocumentOrPublication(\n      null,\n      pubUrl,\n      opt_documentOptions,\n      opt_viewerOptions,\n    );\n  }\n\n  /**\n   * Load an HTML or XML document, or an EPUB/WebPub publication.\n   */\n  private loadDocumentOrPublication(\n    singleDocumentOptions:\n      | SingleDocumentOptions\n      | SingleDocumentOptions[]\n      | null,\n    pubUrl: string | null,\n    opt_documentOptions?: DocumentOptions,\n    opt_viewerOptions?: CoreViewerOptions,\n  ) {\n    const documentOptions = opt_documentOptions || {};\n\n    function convertStyleSheetArray(arr) {\n      if (arr) {\n        return arr.map((s) => ({ url: s.url || null, text: s.text || null }));\n      } else {\n        return undefined;\n      }\n    }\n    const authorStyleSheet = convertStyleSheetArray(\n      documentOptions[\"authorStyleSheet\"],\n    );\n    const userStyleSheet = convertStyleSheetArray(\n      documentOptions[\"userStyleSheet\"],\n    );\n    if (opt_viewerOptions) {\n      Object.assign(this.options, opt_viewerOptions);\n    }\n    const command = Object.assign(\n      {\n        a: singleDocumentOptions ? \"loadXML\" : \"loadPublication\",\n        userAgentRootURL: this.settings[\"userAgentRootURL\"],\n        url: convertSingleDocumentOptions(singleDocumentOptions) || pubUrl,\n        document: documentOptions[\"documentObject\"],\n        fragment: documentOptions[\"fragment\"],\n        authorStyleSheet: authorStyleSheet,\n        userStyleSheet: userStyleSheet,\n      },\n      convertViewerOptions(this.options),\n    );\n    if (this.initialized) {\n      this.adaptViewer_.sendCommand(command);\n    } else {\n      this.initialized = true;\n      this.adaptViewer_.initEmbed(command);\n    }\n  }\n\n  /**\n   * Returns the current page progression of the viewer. If no document is\n   * loaded, returns null.\n   */\n  getCurrentPageProgression(): Constants.PageProgression | null {\n    return this.adaptViewer_.getCurrentPageProgression();\n  }\n\n  private resolveNavigation(nav: Navigation): Navigation {\n    switch (nav) {\n      case Navigation.LEFT:\n        return this.getCurrentPageProgression() === PageProgression.LTR\n          ? Navigation.PREVIOUS\n          : Navigation.NEXT;\n      case Navigation.RIGHT:\n        return this.getCurrentPageProgression() === PageProgression.LTR\n          ? Navigation.NEXT\n          : Navigation.PREVIOUS;\n      default:\n        return nav;\n    }\n  }\n\n  /**\n   * Navigate to the specified page.\n   */\n  navigateToPage(nav: Navigation, opt_epage?: number) {\n    if (nav === Navigation.EPAGE) {\n      this.adaptViewer_.sendCommand({\n        a: \"moveTo\",\n        epage: opt_epage,\n      });\n    } else {\n      this.adaptViewer_.sendCommand({\n        a: \"moveTo\",\n        where: this.resolveNavigation(nav),\n      });\n    }\n  }\n\n  /**\n   * Navigate to the specified internal URL.\n   */\n  navigateToInternalUrl(url: string) {\n    this.adaptViewer_.sendCommand({ a: \"moveTo\", url: url });\n  }\n\n  /**\n   * @returns True if TOC is visible, false if hidden, null if TOC is unavailable\n   */\n  isTOCVisible(): boolean | null {\n    if (\n      this.adaptViewer_.opfView &&\n      this.adaptViewer_.opfView.opf &&\n      (this.adaptViewer_.opfView.opf.xhtmlToc ||\n        this.adaptViewer_.opfView.opf.ncxToc)\n    ) {\n      return !!this.adaptViewer_.opfView.isTOCVisible();\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * Show or hide TOC box\n   * @param opt_autohide If true, automatically hide when click TOC item\n   * @param opt_show If true show TOC, false hide TOC. If null or undefined toggle TOC.\n   */\n  showTOC(opt_show?: boolean | null, opt_autohide?: boolean) {\n    const visibility = opt_show == null ? \"toggle\" : opt_show ? \"show\" : \"hide\";\n    this.adaptViewer_.sendCommand({\n      a: \"toc\",\n      v: visibility,\n      autohide: opt_autohide,\n    });\n  }\n\n  /**\n   * Returns zoom factor corresponding to the specified zoom type.\n   */\n  queryZoomFactor(type: AdaptiveViewer.ZoomType): number {\n    return this.adaptViewer_.queryZoomFactor(type);\n  }\n\n  getPageSizes(): { width: number; height: number }[] {\n    return this.adaptViewer_.pageSizes;\n  }\n}\n\nfunction convertSingleDocumentOptions(\n  singleDocumentOptions: SingleDocumentOptions | SingleDocumentOptions[],\n): AdaptiveViewer.SingleDocumentParam[] | null {\n  function toNumberOrNull(num: any): number | null {\n    return typeof num === \"number\" ? num : null;\n  }\n\n  function convert(opt) {\n    if (typeof opt === \"string\") {\n      return {\n        url: opt,\n        startPage: null,\n        skipPagesBefore: null,\n      } as AdaptiveViewer.SingleDocumentParam;\n    } else {\n      return {\n        url: opt[\"url\"],\n        startPage: toNumberOrNull(opt[\"startPage\"]),\n        skipPagesBefore: toNumberOrNull(opt[\"skipPagesBefore\"]),\n      } as AdaptiveViewer.SingleDocumentParam;\n    }\n  }\n  if (Array.isArray(singleDocumentOptions)) {\n    return singleDocumentOptions.map(convert);\n  } else if (singleDocumentOptions) {\n    return [convert(singleDocumentOptions)];\n  } else {\n    return null;\n  }\n}\n\n/**\n * @enum {string}\n */\nexport enum Navigation {\n  PREVIOUS = \"previous\",\n  NEXT = \"next\",\n  LEFT = \"left\",\n  RIGHT = \"right\",\n  FIRST = \"first\",\n  LAST = \"last\",\n  EPAGE = \"epage\",\n}\n\nexport type ZoomType = AdaptiveViewer.ZoomType;\nexport const ZoomType = AdaptiveViewer.ZoomType;\n\nexport type PageViewMode = AdaptiveViewer.PageViewMode;\nexport const PageViewMode = AdaptiveViewer.PageViewMode;\n\nexport const viewer = {\n  CoreViewer,\n  PageViewMode,\n  ZoomType,\n};\n\nProfile.profiler.forceRegisterEndTiming(\"load_vivliostyle\");\n","// Johannes Wilm\n// Vivliostyle Foundation\n\nimport * as CoreViewer from \"./core-viewer\";\nimport viewportCss from \"../../resources/vivliostyle-viewport.css\";\nimport viewportScreenCss from \"../../resources/vivliostyle-viewport-screen.css\";\n\ninterface IFrameWindowForPrint {\n  printInstance?: VivliostylePrint;\n}\n\ninterface PrintConfig {\n  title: string;\n  printCallback: (iframeWin: Window) => void;\n  hideIframe: boolean;\n  removeIframe: boolean;\n}\n\nclass VivliostylePrint {\n  htmlDoc: string;\n  title: string;\n  printCallback: (iframeWin: Window) => void;\n  hideIframe: boolean;\n  removeIframe: boolean;\n  iframe: HTMLIFrameElement;\n  iframeWin: Window;\n  window: Window & typeof globalThis & IFrameWindowForPrint;\n\n  constructor(\n    htmlDoc: string,\n    {\n      title = \"\",\n      printCallback = (iframeWin: Window) => iframeWin.print(),\n      hideIframe = true,\n      removeIframe = true,\n    }: PrintConfig,\n  ) {\n    this.htmlDoc = htmlDoc;\n    this.title = title;\n    this.printCallback = printCallback;\n    this.hideIframe = hideIframe;\n    this.removeIframe = removeIframe;\n  }\n\n  init() {\n    this.iframe = document.createElement(\"iframe\");\n\n    if (this.hideIframe) {\n      this.iframe.style.width = \"0\"; // We don't want the iframe to be seen, so we make it zero size with zero border.\n      this.iframe.style.height = \"0\";\n      this.iframe.style.borderWidth = \"0\";\n    }\n\n    this.window = window;\n    this.window.printInstance = this;\n    this.iframe.srcdoc = `\n      <!DOCTYPE html>\n      <html data-vivliostyle-paginated=\"true\">\n        <head>\n          <meta charset='utf-8'/>\n          <meta name='viewport' content='width=device-width, initial-scale=1.0'/>\n          <title>${this.title}</title>\n          <style>${viewportCss}</style>\n          <style>${viewportScreenCss}</style>\n          <style>\n            html[data-vivliostyle-paginated] {\n              width: 100%;\n              height: 100%;\n            }\n            html[data-vivliostyle-paginated] body,\n            html[data-vivliostyle-paginated] [data-vivliostyle-viewer-viewport] {\n              width: 100% !important;\n              height: 100% !important;\n            }\n            html[data-vivliostyle-paginated],\n            html[data-vivliostyle-paginated] body {\n              margin: 0;\n              padding: 0;\n            }\n          </style>\n          <style id='vivliostyle-page-rules'></style>\n        </head>\n        <body onload='parent.printInstance.runInIframe(window)'>\n          <div id=\"vivliostyle-viewer-viewport\"></div>\n        </body>\n      </html>`;\n\n    document.body.appendChild(this.iframe);\n  }\n\n  runInIframe(iframeWin: Window) {\n    this.iframeWin = iframeWin;\n    return this.preparePrint()\n      .then(() => this.browserPrint())\n      .then(() => this.cleanUp());\n  }\n\n  preparePrint() {\n    this.iframeWin.document.title = this.title;\n    const docBlob = new Blob([this.htmlDoc], {\n        type: \"text/html\",\n      }),\n      docURL = URL.createObjectURL(docBlob),\n      Viewer = new CoreViewer.CoreViewer(\n        {\n          viewportElement: this.iframeWin.document.body\n            .firstElementChild as HTMLElement,\n          window: this.iframeWin,\n          debug: true,\n        },\n        {\n          defaultPaperSize: {\n            width: 794, // These numbers give weird output, but not setting them crashes the browser when there is no CSS.\n            height: 1122,\n          },\n        },\n      );\n    return new Promise((resolve) => {\n      Viewer.addListener(\"readystatechange\", () => {\n        if (Viewer.readyState === \"complete\") {\n          resolve();\n        }\n      });\n\n      Viewer.loadDocument({\n        url: docURL,\n      });\n    });\n  }\n\n  browserPrint() {\n    this.printCallback(this.iframeWin);\n  }\n\n  cleanUp() {\n    delete this.window.printInstance;\n    if (this.removeIframe) {\n      this.iframe.parentElement.removeChild(this.iframe);\n    }\n  }\n}\n\nexport function printHTML(htmlDoc: string, config: PrintConfig) {\n  const instance = new VivliostylePrint(htmlDoc, config);\n  instance.init();\n}\n"],"names":["setDebug","value","isDebug","pageProgressionOf","str","PageProgression","LTR","RTL","Error","PageSide","ReadyState","constants","LogLevel","argumentsToErrorInfo","args","a","Array","from","e","shift","error","messages","buildMessageAndStackTrace","stack","concat","length","logger","[object 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