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{DOM} from 'angular2/src/dom/dom_adapter';\nimport {List, ListWrapper} from 'angular2/src/facade/collection';\nimport {\n  StringWrapper,\n  RegExp,\n  RegExpWrapper,\n  RegExpMatcherWrapper,\n  isPresent,\n  isBlank,\n  BaseException,\n  int\n} from 'angular2/src/facade/lang';\n\n/**\n * This file is a port of shadowCSS from webcomponents.js to AtScript.\n *\n * Please make sure to keep to edits in sync with the source file.\n *\n * Source: https://github.com/webcomponents/webcomponentsjs/blob/4efecd7e0e/src/ShadowCSS/ShadowCSS.js\n *\n * The original file level comment is reproduced below\n */\n\n/*\n  This is a limited shim for ShadowDOM css styling.\n  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles\n\n  The intention here is to support only the styling features which can be\n  relatively simply implemented. The goal is to allow users to avoid the\n  most obvious pitfalls and do so without compromising performance significantly.\n  For ShadowDOM styling that's not covered here, a set of best practices\n  can be provided that should allow users to accomplish more complex styling.\n\n  The following is a list of specific ShadowDOM styling features and a brief\n  discussion of the approach used to shim.\n\n  Shimmed features:\n\n  * :host, :host-context: ShadowDOM allows styling of the shadowRoot's host\n  element using the :host rule. To shim this feature, the :host styles are\n  reformatted and prefixed with a given scope name and promoted to a\n  document level stylesheet.\n  For example, given a scope name of .foo, a rule like this:\n\n    :host {\n        background: red;\n      }\n    }\n\n  becomes:\n\n    .foo {\n      background: red;\n    }\n\n  * encapsultion: Styles defined within ShadowDOM, apply only to\n  dom inside the ShadowDOM. Polymer uses one of two techniques to imlement\n  this feature.\n\n  By default, rules are prefixed with the host element tag name\n  as a descendant selector. This ensures styling does not leak out of the 'top'\n  of the element's ShadowDOM. For example,\n\n  div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n  x-foo div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n\n  Alternatively, if WebComponents.ShadowCSS.strictStyling is set to true then\n  selectors are scoped by adding an attribute selector suffix to each\n  simple selector that contains the host element tag name. Each element\n  in the element's ShadowDOM template is also given the scope attribute.\n  Thus, these rules match only elements that have the scope attribute.\n  For example, given a scope name of x-foo, a rule like this:\n\n    div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n    div[x-foo] {\n      font-weight: bold;\n    }\n\n  Note that elements that are dynamically added to a scope must have the scope\n  selector added to them manually.\n\n  * upper/lower bound encapsulation: Styles which are defined outside a\n  shadowRoot should not cross the ShadowDOM boundary and should not apply\n  inside a shadowRoot.\n\n  This styling behavior is not emulated. Some possible ways to do this that\n  were rejected due to complexity and/or performance concerns include: (1) reset\n  every possible property for every possible selector for a given scope name;\n  (2) re-implement css in javascript.\n\n  As an alternative, users should make sure to use selectors\n  specific to the scope in which they are working.\n\n  * ::distributed: This behavior is not emulated. It's often not necessary\n  to style the contents of a specific insertion point and instead, descendants\n  of the host element can be styled selectively. Users can also create an\n  extra node around an insertion point and style that node's contents\n  via descendent selectors. For example, with a shadowRoot like this:\n\n    <style>\n      ::content(div) {\n        background: red;\n      }\n    </style>\n    <content></content>\n\n  could become:\n\n    <style>\n      / *@polyfill .content-container div * /\n      ::content(div) {\n        background: red;\n      }\n    </style>\n    <div class=\"content-container\">\n      <content></content>\n    </div>\n\n  Note the use of @polyfill in the comment above a ShadowDOM specific style\n  declaration. This is a directive to the styling shim to use the selector\n  in comments in lieu of the next selector when running under polyfill.\n*/\n\nexport class ShadowCss {\n  strictStyling: boolean;\n\n  constructor() {\n    this.strictStyling = true;\n  }\n\n  /*\n  * Shim a style element with the given selector. Returns cssText that can\n  * be included in the document via WebComponents.ShadowCSS.addCssToDocument(css).\n  */\n  shimStyle(style, selector: string, hostSelector: string = ''): string {\n    var cssText = DOM.getText(style);\n    return this.shimCssText(cssText, selector, hostSelector);\n  }\n\n  /*\n  * Shim some cssText with the given selector. Returns cssText that can\n  * be included in the document via WebComponents.ShadowCSS.addCssToDocument(css).\n  *\n  * When strictStyling is true:\n  * - selector is the attribute added to all elements inside the host,\n  * - hostSelector is the attribute added to the host itself.\n  */\n  shimCssText(cssText: string, selector: string, hostSelector: string = ''): string {\n    cssText = this._insertDirectives(cssText);\n    return this._scopeCssText(cssText, selector, hostSelector);\n  }\n\n  _insertDirectives(cssText: string): string {\n    cssText = this._insertPolyfillDirectivesInCssText(cssText);\n    return this._insertPolyfillRulesInCssText(cssText);\n  }\n\n  /*\n   * Process styles to convert native ShadowDOM rules that will trip\n   * up the css parser; we rely on decorating the stylesheet with inert rules.\n   *\n   * For example, we convert this rule:\n   *\n   * polyfill-next-selector { content: ':host menu-item'; }\n   * ::content menu-item {\n   *\n   * to this:\n   *\n   * scopeName menu-item {\n   *\n  **/\n  _insertPolyfillDirectivesInCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    return StringWrapper.replaceAllMapped(cssText, _cssContentNextSelectorRe, function(m) {\n      return m[1] + '{';\n    });\n  }\n\n  /*\n   * Process styles to add rules which will only apply under the polyfill\n   *\n   * For example, we convert this rule:\n   *\n   * polyfill-rule {\n   *   content: ':host menu-item';\n   * ...\n   * }\n   *\n   * to this:\n   *\n   * scopeName menu-item {...}\n   *\n  **/\n  _insertPolyfillRulesInCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    return StringWrapper.replaceAllMapped(cssText, _cssContentRuleRe, function(m) {\n      var rule = m[0];\n      rule = StringWrapper.replace(rule, m[1], '');\n      rule = StringWrapper.replace(rule, m[2], '');\n      return m[3] + rule;\n    });\n  }\n\n  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:\n   *\n   *  .foo {... }\n   *\n   *  and converts this to\n   *\n   *  scopeName .foo { ... }\n  */\n  _scopeCssText(cssText: string, scopeSelector: string, hostSelector: string): string {\n\n    var unscoped = this._extractUnscopedRulesFromCssText(cssText);\n    cssText = this._insertPolyfillHostInCssText(cssText);\n    cssText = this._convertColonHost(cssText);\n    cssText = this._convertColonHostContext(cssText);\n    cssText = this._convertShadowDOMSelectors(cssText);\n    if (isPresent(scopeSelector)) {\n      _withCssRules(cssText, (rules) => {\n        cssText = this._scopeRules(rules, scopeSelector, hostSelector);\n      });\n    }\n    cssText = cssText + '\\n' + unscoped;\n    return cssText.trim();\n  }\n\n  /*\n   * Process styles to add rules which will only apply under the polyfill\n   * and do not process via CSSOM. (CSSOM is destructive to rules on rare\n   * occasions, e.g. -webkit-calc on Safari.)\n   * For example, we convert this rule:\n   *\n   * @polyfill-unscoped-rule {\n   *   content: 'menu-item';\n   * ... }\n   *\n   * to this:\n   *\n   * menu-item {...}\n   *\n  **/\n  _extractUnscopedRulesFromCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    var r = '', m;\n    var matcher = RegExpWrapper.matcher(_cssContentUnscopedRuleRe, cssText);\n    while (isPresent(m = RegExpMatcherWrapper.next(matcher))) {\n      var rule = m[0];\n      rule = StringWrapper.replace(rule, m[2], '');\n      rule = StringWrapper.replace(rule, m[1], m[3]);\n      r = rule + '\\n\\n';\n    }\n    return r;\n  }\n\n  /*\n   * convert a rule like :host(.foo) > .bar { }\n   *\n   * to\n   *\n   * scopeName.foo > .bar\n  */\n  _convertColonHost(cssText: string): string {\n    return this._convertColonRule(cssText, _cssColonHostRe,\n      this._colonHostPartReplacer);\n  }\n\n  /*\n   * convert a rule like :host-context(.foo) > .bar { }\n   *\n   * to\n   *\n   * scopeName.foo > .bar, .foo scopeName > .bar { }\n   *\n   * and\n   *\n   * :host-context(.foo:host) .bar { ... }\n   *\n   * to\n   *\n   * scopeName.foo .bar { ... }\n  */\n  _convertColonHostContext(cssText: string): string {\n    return this._convertColonRule(cssText, _cssColonHostContextRe,\n      this._colonHostContextPartReplacer);\n  }\n\n  _convertColonRule(cssText: string, regExp: RegExp, partReplacer: Function): string {\n    // p1 = :host, p2 = contents of (), p3 rest of rule\n    return StringWrapper.replaceAllMapped(cssText, regExp, function(m) {\n      if (isPresent(m[2])) {\n        var parts = m[2].split(','), r = [];\n        for (var i = 0; i < parts.length; i++) {\n          var p = parts[i];\n          if (isBlank(p)) break;\n          p = p.trim();\n          ListWrapper.push(r, partReplacer(_polyfillHostNoCombinator, p, m[3]));\n        }\n        return r.join(',');\n      } else {\n        return _polyfillHostNoCombinator + m[3];\n      }\n    });\n  }\n\n  _colonHostContextPartReplacer(host: string, part: string, suffix: string): string {\n    if (StringWrapper.contains(part, _polyfillHost)) {\n      return this._colonHostPartReplacer(host, part, suffix);\n    } else {\n      return host + part + suffix + ', ' + part + ' ' + host + suffix;\n    }\n  }\n\n  _colonHostPartReplacer(host: string, part: string, suffix: string): string {\n    return host + StringWrapper.replace(part, _polyfillHost, '') + suffix;\n  }\n\n  /*\n   * Convert combinators like ::shadow and pseudo-elements like ::content\n   * by replacing with space.\n  */\n  _convertShadowDOMSelectors(cssText: string): string {\n    for (var i = 0; i < _shadowDOMSelectorsRe.length; i++) {\n      cssText = StringWrapper.replaceAll(cssText, _shadowDOMSelectorsRe[i], ' ');\n    }\n    return cssText;\n  }\n\n  // change a selector like 'div' to 'name div'\n  _scopeRules(cssRules, scopeSelector: string, hostSelector: string): string {\n    var cssText = '';\n    if (isPresent(cssRules)) {\n      for (var i = 0; i < cssRules.length; i++) {\n        var rule = cssRules[i];\n        if (DOM.isStyleRule(rule) || DOM.isPageRule(rule)) {\n          cssText += this._scopeSelector(rule.selectorText, scopeSelector, hostSelector,\n            this.strictStyling) + ' {\\n';\n          cssText += this._propertiesFromRule(rule) + '\\n}\\n\\n';\n        } else if (DOM.isMediaRule(rule)) {\n          cssText += '@media ' + rule.media.mediaText + ' {\\n';\n          cssText += this._scopeRules(rule.cssRules, scopeSelector, hostSelector);\n          cssText += '\\n}\\n\\n';\n        } else {\n          // KEYFRAMES_RULE in IE throws when we query cssText\n          // when it contains a -webkit- property.\n          // if this happens, we fallback to constructing the rule\n          // from the CSSRuleSet\n          // https://connect.microsoft.com/IE/feedbackdetail/view/955703/accessing-csstext-of-a-keyframe-rule-that-contains-a-webkit-property-via-cssom-generates-exception\n          try {\n            if (isPresent(rule.cssText)) {\n              cssText += rule.cssText + '\\n\\n';\n            }\n          } catch(x) {\n            if (DOM.isKeyframesRule(rule) && isPresent(rule.cssRules)) {\n              cssText += this._ieSafeCssTextFromKeyFrameRule(rule);\n            }\n          }\n        }\n      }\n    }\n    return cssText;\n  }\n\n  _ieSafeCssTextFromKeyFrameRule(rule): string {\n    var cssText = '@keyframes ' + rule.name + ' {';\n    for (var i = 0; i < rule.cssRules.length; i++) {\n      var r = rule.cssRules[i];\n      cssText += ' ' + r.keyText + ' {' + r.style.cssText + '}';\n    }\n    cssText += ' }';\n    return cssText;\n  }\n\n  _scopeSelector(selector: string, scopeSelector: string, hostSelector: string,\n      strict: boolean): string {\n    var r = [], parts = selector.split(',');\n    for (var i = 0; i < parts.length; i++) {\n      var p = parts[i];\n      p = p.trim();\n      if (this._selectorNeedsScoping(p, scopeSelector)) {\n        p = strict && !StringWrapper.contains(p, _polyfillHostNoCombinator) ?\n            this._applyStrictSelectorScope(p, scopeSelector) :\n            this._applySelectorScope(p, scopeSelector, hostSelector);\n      }\n      ListWrapper.push(r, p);\n    }\n    return r.join(', ');\n  }\n\n  _selectorNeedsScoping(selector: string, scopeSelector: string): boolean {\n    var re = this._makeScopeMatcher(scopeSelector);\n    return !isPresent(RegExpWrapper.firstMatch(re, selector));\n  }\n\n  _makeScopeMatcher(scopeSelector: string): RegExp {\n    var lre = RegExpWrapper.create('\\\\[');\n    var rre = RegExpWrapper.create('\\\\]');\n    scopeSelector = StringWrapper.replaceAll(scopeSelector, lre, '\\\\[');\n    scopeSelector = StringWrapper.replaceAll(scopeSelector, rre, '\\\\]');\n    return RegExpWrapper.create('^(' + scopeSelector + ')' + _selectorReSuffix, 'm');\n  }\n\n  _applySelectorScope(selector: string, scopeSelector: string, hostSelector: string): string {\n    // Difference from webcomponentsjs: scopeSelector could not be an array\n    return this._applySimpleSelectorScope(selector, scopeSelector, hostSelector);\n  }\n\n  // scope via name and [is=name]\n  _applySimpleSelectorScope(selector: string, scopeSelector: string, hostSelector: string): string {\n    if (isPresent(RegExpWrapper.firstMatch(_polyfillHostRe, selector))) {\n      var replaceBy = this.strictStyling ? `[${hostSelector}]` : scopeSelector;\n      selector = StringWrapper.replace(selector, _polyfillHostNoCombinator, replaceBy);\n      return StringWrapper.replaceAll(selector, _polyfillHostRe, replaceBy + ' ');\n    } else {\n      return scopeSelector + ' ' + selector;\n    }\n  }\n\n  // return a selector with [name] suffix on each simple selector\n  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]\n  _applyStrictSelectorScope(selector: string, scopeSelector: string): string {\n    var isRe = RegExpWrapper.create('\\\\[is=([^\\\\]]*)\\\\]');\n    scopeSelector = StringWrapper.replaceAllMapped(scopeSelector, isRe, (m) => m[1]);\n    var splits = [' ', '>', '+', '~'],\n      scoped = selector,\n      attrName = '[' + scopeSelector + ']';\n    for (var i = 0; i < splits.length; i++) {\n      var sep = splits[i];\n      var parts = scoped.split(sep);\n      scoped = ListWrapper.map(parts, function(p) {\n        // remove :host since it should be unnecessary\n        var t = StringWrapper.replaceAll(p.trim(), _polyfillHostRe, '');\n        if (t.length > 0 &&\n            !ListWrapper.contains(splits, t) &&\n            !StringWrapper.contains(t, attrName)) {\n          var re = RegExpWrapper.create('([^:]*)(:*)(.*)');\n          var m = RegExpWrapper.firstMatch(re, t);\n          if (isPresent(m)) {\n            p = m[1] + attrName + m[2] + m[3];\n          }\n        }\n        return p;\n      }).join(sep);\n    }\n    return scoped;\n  }\n\n  _insertPolyfillHostInCssText(selector: string): string {\n    selector = StringWrapper.replaceAll(selector, _colonHostContextRe, _polyfillHostContext);\n    selector = StringWrapper.replaceAll(selector, _colonHostRe, _polyfillHost);\n    return selector;\n  }\n\n  _propertiesFromRule(rule): string {\n    var cssText = rule.style.cssText;\n    // TODO(sorvell): Safari cssom incorrectly removes quotes from the content\n    // property. (https://bugs.webkit.org/show_bug.cgi?id=118045)\n    // don't replace attr rules\n    var attrRe = RegExpWrapper.create('[\\'\"]+|attr');\n    if (rule.style.content.length > 0 &&\n        !isPresent(RegExpWrapper.firstMatch(attrRe, rule.style.content))) {\n      var contentRe = RegExpWrapper.create('content:[^;]*;');\n      cssText = StringWrapper.replaceAll(cssText, contentRe, 'content: \\'' +\n        rule.style.content + '\\';');\n    }\n    // TODO(sorvell): we can workaround this issue here, but we need a list\n    // of troublesome properties to fix https://github.com/Polymer/platform/issues/53\n    //\n    // inherit rules can be omitted from cssText\n    // TODO(sorvell): remove when Blink bug is fixed:\n    // https://code.google.com/p/chromium/issues/detail?id=358273\n    //var style = rule.style;\n    //for (var i = 0; i < style.length; i++) {\n    //  var name = style.item(i);\n    //  var value = style.getPropertyValue(name);\n    //  if (value == 'initial') {\n    //    cssText += name + ': initial; ';\n    //  }\n    //}\n    return cssText;\n  }\n}\n\nvar _cssContentNextSelectorRe = RegExpWrapper.create(\n  'polyfill-next-selector[^}]*content:[\\\\s]*?[\\'\"](.*?)[\\'\"][;\\\\s]*}([^{]*?){', 'im');\nvar _cssContentRuleRe = RegExpWrapper.create(\n  '(polyfill-rule)[^}]*(content:[\\\\s]*[\\'\"](.*?)[\\'\"])[;\\\\s]*[^}]*}', 'im');\nvar _cssContentUnscopedRuleRe = RegExpWrapper.create(\n  '(polyfill-unscoped-rule)[^}]*(content:[\\\\s]*[\\'\"](.*?)[\\'\"])[;\\\\s]*[^}]*}', 'im');\nvar _polyfillHost = '-shadowcsshost';\n// note: :host-context pre-processed to -shadowcsshostcontext.\nvar _polyfillHostContext = '-shadowcsscontext';\nvar _parenSuffix = ')(?:\\\\((' +\n                   '(?:\\\\([^)(]*\\\\)|[^)(]*)+?' +\n                   ')\\\\))?([^,{]*)';\nvar _cssColonHostRe = RegExpWrapper.create('(' + _polyfillHost + _parenSuffix, 'im');\nvar _cssColonHostContextRe = RegExpWrapper.create('(' + _polyfillHostContext + _parenSuffix, 'im');\nvar _polyfillHostNoCombinator = _polyfillHost + '-no-combinator';\nvar _shadowDOMSelectorsRe = [\n  RegExpWrapper.create('>>>'),\n  RegExpWrapper.create('::shadow'),\n  RegExpWrapper.create('::content'),\n  // Deprecated selectors\n  RegExpWrapper.create('/deep/'), // former >>>\n  RegExpWrapper.create('/shadow-deep/'), // former /deep/\n  RegExpWrapper.create('/shadow/'), // former ::shadow\n];\nvar _selectorReSuffix = '([>\\\\s~+\\[.,{:][\\\\s\\\\S]*)?$';\nvar _polyfillHostRe = RegExpWrapper.create(_polyfillHost, 'im');\nvar _colonHostRe = RegExpWrapper.create(':host', 'im');\nvar _colonHostContextRe = RegExpWrapper.create(':host-context', 'im');\n\nfunction _cssToRules(cssText: string) {\n  return DOM.cssToRules(cssText);\n}\n\nfunction _withCssRules(cssText: string, callback: Function) {\n  // Difference from webcomponentjs: remove the workaround for an old bug in Chrome\n  if (isBlank(callback)) return;\n  var rules = _cssToRules(cssText);\n  callback(rules);\n}\n"]}