{"version":3,"file":"markdown-it-katex.cjs","sources":["../../../../src/RichTextEditor/tiptap_extensions/extension-markdown-paste/markdown-it-katex.ts"],"sourcesContent":["import type MarkdownIt from \"markdown-it\";\nimport type * as StateBlock from \"markdown-it/lib/rules_block/state_block\";\nimport type StateCore from \"markdown-it/lib/rules_core/state_core\";\nimport type * as StateInline from \"markdown-it/lib/rules_inline/state_inline\";\nimport type * as Token from \"markdown-it/lib/token\";\n\nfunction isWhitespace(char: string): boolean {\n\treturn /^\\s$/u.test(char);\n}\n\nfunction isWordCharacterOrNumber(char: string): boolean {\n\treturn /^[\\w\\d]$/u.test(char);\n}\n\n/**\n * Test if potential opening or closing delimiter\n */\nfunction isValidInlineDelim(\n\tstate: StateInline,\n\tpos: number,\n): { can_open: boolean; can_close: boolean } {\n\tconst prevChar = state.src[pos - 1];\n\tconst char = state.src[pos];\n\tconst nextChar = state.src[pos + 1];\n\n\tif (char !== \"$\") {\n\t\treturn { can_open: false, can_close: false };\n\t}\n\n\tlet canOpen = false;\n\tlet canClose = false;\n\tif (\n\t\tprevChar !== \"$\" &&\n\t\tprevChar !== \"\\\\\" &&\n\t\t(prevChar === undefined ||\n\t\t\tisWhitespace(prevChar) ||\n\t\t\t!isWordCharacterOrNumber(prevChar))\n\t) {\n\t\tcanOpen = true;\n\t}\n\n\tif (\n\t\tnextChar !== \"$\" &&\n\t\t(nextChar === undefined ||\n\t\t\tisWhitespace(nextChar) ||\n\t\t\t!isWordCharacterOrNumber(nextChar))\n\t) {\n\t\tcanClose = true;\n\t}\n\n\treturn { can_open: canOpen, can_close: canClose };\n}\n\nfunction isValidBlockDelim(\n\tstate: StateInline,\n\tpos: number,\n): { readonly can_open: boolean; readonly can_close: boolean } {\n\tconst prevChar = state.src[pos - 1];\n\tconst char = state.src[pos];\n\tconst nextChar = state.src[pos + 1];\n\tconst nextCharPlus1 = state.src[pos + 2];\n\n\tif (\n\t\tchar === \"$\" &&\n\t\tprevChar !== \"$\" &&\n\t\tprevChar !== \"\\\\\" &&\n\t\tnextChar === \"$\" &&\n\t\tnextCharPlus1 !== \"$\"\n\t) {\n\t\treturn { can_open: true, can_close: true };\n\t}\n\n\treturn { can_open: false, can_close: false };\n}\n\n/**\n * $...$ 包裹的内联Tetex数学公式\n * @param state\n * @param silent\n * @returns\n */\nfunction inlineMath(state: StateInline, silent: boolean): boolean {\n\tif (state.src[state.pos] !== \"$\") {\n\t\treturn false;\n\t}\n\n\tconst lastToken = state.tokens.at(-1);\n\tif (lastToken?.type === \"html_inline\") {\n\t\t// We may be inside of inside of inline html\n\t\tif (/^<\\w+.+[^/]>$/.test(lastToken.content)) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\tlet res = isValidInlineDelim(state, state.pos);\n\tif (!res.can_open) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$\";\n\t\t}\n\t\tstate.pos += 1;\n\t\treturn true;\n\t}\n\n\t// First check for and bypass all properly escaped delimieters\n\t// This loop will assume that the first leading backtick can not\n\t// be the first character in state.src, which is known since\n\t// we have found an opening delimieter already.\n\tconst start = state.pos + 1;\n\tlet match = start;\n\tlet pos: number;\n\twhile ((match = state.src.indexOf(\"$\", match)) !== -1) {\n\t\t// Found potential $, look for escapes, pos will point to\n\t\t// first non escape when complete\n\t\tpos = match - 1;\n\t\twhile (state.src[pos] === \"\\\\\") {\n\t\t\tpos -= 1;\n\t\t}\n\n\t\t// Even number of escapes, potential closing delimiter found\n\t\tif ((match - pos) % 2 === 1) {\n\t\t\tbreak;\n\t\t}\n\t\tmatch += 1;\n\t}\n\n\t// No closing delimter found. Consume $ and continue.\n\tif (match === -1) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$\";\n\t\t}\n\t\tstate.pos = start;\n\t\treturn true;\n\t}\n\n\t// Check if we have empty content, ie: $$. Do not parse.\n\tif (match - start === 0) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$$\";\n\t\t}\n\t\tstate.pos = start + 1;\n\t\treturn true;\n\t}\n\n\t// Check for valid closing delimiter\n\tres = isValidInlineDelim(state, match);\n\tif (!res.can_close) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$\";\n\t\t}\n\t\tstate.pos = start;\n\t\treturn true;\n\t}\n\n\tif (!silent) {\n\t\tconst token = state.push(\"math_inline\", \"math\", 0);\n\t\ttoken.markup = \"$\";\n\t\ttoken.content = state.src.slice(start, match);\n\t}\n\n\tstate.pos = match + 1;\n\treturn true;\n}\n\nfunction blockMath(\n\tstate: StateBlock,\n\tstart: number,\n\tend: number,\n\tsilent: boolean,\n): boolean {\n\tlet lastLine: any;\n\tlet next: any;\n\tlet lastPos: any;\n\tlet found = false;\n\tlet pos = state.bMarks[start] + state.tShift[start];\n\tlet max = state.eMarks[start];\n\n\tif (pos + 2 > max) {\n\t\treturn false;\n\t}\n\tif (state.src.slice(pos, pos + 2) !== \"$$\") {\n\t\treturn false;\n\t}\n\n\tpos += 2;\n\tlet firstLine = state.src.slice(pos, max);\n\n\tif (silent) {\n\t\treturn true;\n\t}\n\tif (firstLine.trim().slice(-2) === \"$$\") {\n\t\t// Single line expression\n\t\tfirstLine = firstLine.trim().slice(0, -2);\n\t\tfound = true;\n\t}\n\n\tfor (next = start; !found; ) {\n\t\tnext += 1;\n\n\t\tif (next >= end) {\n\t\t\tbreak;\n\t\t}\n\n\t\tpos = state.bMarks[next] + state.tShift[next];\n\t\tmax = state.eMarks[next];\n\n\t\tif (pos < max && state.tShift[next] < state.blkIndent) {\n\t\t\t// non-empty line with negative indent should stop the list:\n\t\t\tbreak;\n\t\t}\n\n\t\tif (state.src.slice(pos, max).trim().slice(-2) === \"$$\") {\n\t\t\tlastPos = state.src.slice(0, max).lastIndexOf(\"$$\");\n\t\t\tlastLine = state.src.slice(pos, lastPos);\n\t\t\tfound = true;\n\t\t} else if (state.src.slice(pos, max).trim().includes(\"$$\")) {\n\t\t\tlastPos = state.src.slice(0, max).trim().indexOf(\"$$\");\n\t\t\tlastLine = state.src.slice(pos, lastPos);\n\t\t\tfound = true;\n\t\t}\n\t}\n\n\tstate.line = next + 1;\n\n\tconst token = state.push(\"math_block\", \"math\", 0);\n\ttoken.block = true;\n\ttoken.content =\n\t\t(firstLine?.trim() ? `${firstLine}\\n` : \"\") +\n\t\tstate.getLines(start + 1, next, state.tShift[start], true) +\n\t\t(lastLine?.trim() ? lastLine : \"\");\n\ttoken.map = [start, state.line];\n\ttoken.markup = \"$$\";\n\n\treturn true;\n}\n\nfunction blockBareMath(\n\tstate: StateBlock,\n\tstart: number,\n\tend: number,\n\tsilent: boolean,\n): boolean {\n\tlet lastLine: any;\n\tlet found = false;\n\tlet pos = state.bMarks[start] + state.tShift[start];\n\tlet max = state.eMarks[start];\n\n\tconst firstLine = state.src.slice(pos, max);\n\n\tif (!/^\\\\begin/.test(firstLine)) {\n\t\treturn false;\n\t}\n\n\tif (start > 0) {\n\t\t// Previous line must be blank for bare blocks\n\t\tconst previousStart = state.bMarks[start - 1] + state.tShift[start - 1];\n\t\tconst previousEnd = state.eMarks[start - 1];\n\t\tconst previousLine = state.src.slice(previousStart, previousEnd);\n\t\tif (!/^\\s*$/.test(previousLine)) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\tif (silent) {\n\t\treturn true;\n\t}\n\n\t// Handle Single line code block\n\tlet next = start;\n\tif (!/\\\\end[{}\\w]*\\s*$/.test(firstLine)) {\n\t\tlet nestingCount = 0;\n\t\twhile (!found) {\n\t\t\tnext += 1;\n\t\t\tif (next >= end) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tpos = state.bMarks[next] + state.tShift[next];\n\t\t\tmax = state.eMarks[next];\n\n\t\t\tif (pos < max && state.tShift[next] < state.blkIndent) {\n\t\t\t\t// non-empty line with negative indent should stop the list:\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tconst line = state.src.slice(pos, max);\n\t\t\tif (/\\\\begin/.test(line)) {\n\t\t\t\tnestingCount += 1;\n\t\t\t} else if (/\\\\end/.test(line)) {\n\t\t\t\tnestingCount -= 1;\n\t\t\t\tif (nestingCount < 0) {\n\t\t\t\t\tconst lastPos = max;\n\t\t\t\t\tlastLine = state.src.slice(pos, lastPos);\n\t\t\t\t\tfound = true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tstate.line = next + 1;\n\n\tconst token = state.push(\"math_block\", \"math\", 0);\n\ttoken.block = true;\n\ttoken.content =\n\t\t(firstLine?.trim() ? `${firstLine}\\n` : \"\") +\n\t\tstate.getLines(start + 1, next, state.tShift[start], true) +\n\t\t(lastLine?.trim() ? lastLine : \"\");\n\ttoken.map = [start, state.line];\n\ttoken.markup = \"$$\";\n\treturn true;\n}\n\n/**\n * $$...$$ 包裹的块级Tetex数学公式规则\n * @param state\n * @param silent\n * @returns\n */\nfunction inlineMathBlock(state: StateInline, silent: boolean): boolean {\n\tlet match: any;\n\tlet token: any;\n\tlet res: any;\n\tlet pos: any;\n\n\tif (state.src.slice(state.pos, state.pos + 2) !== \"$$\") {\n\t\treturn false;\n\t}\n\n\tres = isValidBlockDelim(state, state.pos);\n\tif (!res.can_open) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$$\";\n\t\t}\n\t\tstate.pos += 2;\n\t\treturn true;\n\t}\n\n\t// First check for and bypass all properly escaped delimieters\n\t// This loop will assume that the first leading backtick can not\n\t// be the first character in state.src, which is known since\n\t// we have found an opening delimieter already.\n\tconst start = state.pos + 2;\n\tmatch = start;\n\twhile ((match = state.src.indexOf(\"$$\", match)) !== -1) {\n\t\t// Found potential $$, look for escapes, pos will point to\n\t\t// first non escape when complete\n\t\tpos = match - 1;\n\t\twhile (state.src[pos] === \"\\\\\") {\n\t\t\tpos -= 1;\n\t\t}\n\n\t\t// Even number of escapes, potential closing delimiter found\n\t\tif ((match - pos) % 2 === 1) {\n\t\t\tbreak;\n\t\t}\n\t\tmatch += 2;\n\t}\n\n\t// No closing delimter found. Consume $$ and continue.\n\tif (match === -1) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$$\";\n\t\t}\n\t\tstate.pos = start;\n\t\treturn true;\n\t}\n\n\t// Check if we have empty content, ie: $$$$. Do not parse.\n\tif (match - start === 0) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$$$$\";\n\t\t}\n\t\tstate.pos = start + 2;\n\t\treturn true;\n\t}\n\n\t// Check for valid closing delimiter\n\tres = isValidBlockDelim(state, match);\n\tif (!res.can_close) {\n\t\tif (!silent) {\n\t\t\tstate.pending += \"$$\";\n\t\t}\n\t\tstate.pos = start;\n\t\treturn true;\n\t}\n\n\tif (!silent) {\n\t\ttoken = state.push(\"math_block\", \"math\", 0);\n\t\ttoken.block = true;\n\t\ttoken.markup = \"$$\";\n\t\ttoken.content = state.src.slice(start, match);\n\t}\n\n\tstate.pos = match + 2;\n\treturn true;\n}\n\n/**\n * \\begin{Env} ... \\end{Env}包裹的Tatex数学公式规则\n * @param state\n * @param silent\n * @returns\n */\nfunction inlineBareBlock(state: StateInline, silent: boolean): boolean {\n\tconst text = state.src.slice(state.pos);\n\tif (!/^\\n\\\\begin/.test(text)) {\n\t\treturn false;\n\t}\n\tstate.pos += 1;\n\n\tif (silent) {\n\t\treturn true;\n\t}\n\n\tconst lines = text.split(/\\n/g).slice(1);\n\tconst beginRe = /^\\\\begin/;\n\tconst endRe = /^\\\\end/;\n\n\tlet nestingCount = 0;\n\tlet foundLine: number | undefined;\n\tfor (let i = 0; i < lines.length; ++i) {\n\t\tconst line = lines[i];\n\t\tif (beginRe.test(line)) {\n\t\t\tnestingCount += 1;\n\t\t} else if (endRe.test(line)) {\n\t\t\tnestingCount -= 1;\n\t\t\tif (nestingCount <= 0) {\n\t\t\t\tfoundLine = i;\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t}\n\n\tif (typeof foundLine === \"undefined\") {\n\t\treturn false;\n\t}\n\n\tconst endIndex =\n\t\tlines.slice(0, foundLine + 1).reduce((p, c) => p + c.length, 0) +\n\t\tfoundLine +\n\t\t1;\n\n\tif (!silent) {\n\t\tconst token = state.push(\"math_inline_bare_block\", \"math\", 0);\n\t\ttoken.block = true;\n\t\ttoken.markup = \"$$\";\n\t\ttoken.content = text.slice(1, endIndex);\n\t}\n\n\tstate.pos += endIndex;\n\treturn true;\n}\n\n// For any html block that contains math, replace the html block token with new tokens that separate out\n// the html blocks from the math\nfunction handleMathInHtml(\n\tstate: StateCore,\n\tmathType: string,\n\tmathMarkup: string,\n\tmathRegex: RegExp,\n) {\n\tconst { tokens } = state;\n\n\tfor (let index = tokens.length - 1; index >= 0; index--) {\n\t\tconst currentToken = tokens[index];\n\t\tconst newTokens: Token[] = [];\n\n\t\tif (currentToken.type !== \"html_block\") {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst { content } = currentToken;\n\n\t\t// Process for each math referenced within the html block\n\t\tfor (const match of content.matchAll(mathRegex)) {\n\t\t\tif (!match.groups) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst { html_before_math, math, html_after_math } = match.groups;\n\n\t\t\tif (html_before_math) {\n\t\t\t\tnewTokens.push({\n\t\t\t\t\t...currentToken,\n\t\t\t\t\ttype: \"html_block\",\n\t\t\t\t\tmap: null,\n\t\t\t\t\tcontent: html_before_math,\n\t\t\t\t} as Token);\n\t\t\t}\n\n\t\t\tif (math) {\n\t\t\t\tnewTokens.push({\n\t\t\t\t\t...currentToken,\n\t\t\t\t\ttype: mathType,\n\t\t\t\t\tmap: null,\n\t\t\t\t\tcontent: math,\n\t\t\t\t\tmarkup: mathMarkup,\n\t\t\t\t\tblock: true,\n\t\t\t\t\ttag: \"math\",\n\t\t\t\t} as Token);\n\t\t\t}\n\n\t\t\tif (html_after_math) {\n\t\t\t\tnewTokens.push({\n\t\t\t\t\t...currentToken,\n\t\t\t\t\ttype: \"html_block\",\n\t\t\t\t\tmap: null,\n\t\t\t\t\tcontent: html_after_math,\n\t\t\t\t} as Token);\n\t\t\t}\n\t\t}\n\n\t\t// Replace the original html_block token with the newly expanded tokens\n\t\tif (newTokens.length > 0) {\n\t\t\ttokens.splice(index, 1, ...newTokens);\n\t\t}\n\t}\n\treturn true;\n}\n\nexport default function markdownItKatex(md: MarkdownIt, options: any) {\n\t// Default options\n\n\toptions = options || {};\n\n\tconst { enableBareBlocks, enableMathBlockInHtml, enableMathInlineInHtml } =\n\t\toptions;\n\n\tconst katexInline = (markup: string, latex: string) => {\n\t\treturn String.raw`${markup}${latex}${markup}`;\n\t};\n\n\tconst inlineRenderer = (tokens: readonly Token[], idx: number) => {\n\t\treturn katexInline(tokens[idx].markup, tokens[idx].content);\n\t};\n\n\tconst katexBlockRenderer = (markup: string, latex: string) => {\n\t\treturn String.raw`${latex}
`;\n\t};\n\n\tconst blockRenderer = (tokens: readonly Token[], idx: number) => {\n\t\treturn `${katexBlockRenderer(tokens[idx].markup, tokens[idx].content)}\\n`;\n\t};\n\n\tmd.inline.ruler.after(\"escape\", \"math_inline\", inlineMath);\n\tmd.inline.ruler.after(\"escape\", \"math_inline_block\", inlineMathBlock);\n\tif (enableBareBlocks) {\n\t\tmd.inline.ruler.before(\"text\", \"math_inline_bare_block\", inlineBareBlock);\n\t}\n\n\tmd.block.ruler.after(\n\t\t\"blockquote\",\n\t\t\"math_block\",\n\t\t(state, start, end, silent) => {\n\t\t\tif (enableBareBlocks && blockBareMath(state, start, end, silent)) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t\treturn blockMath(state, start, end, silent);\n\t\t},\n\t\t{\n\t\t\talt: [\"paragraph\", \"reference\", \"blockquote\", \"list\"],\n\t\t},\n\t);\n\n\t// Regex to capture any html prior to math block, the math block (single or multi line), and any html after the math block\n\tconst math_block_within_html_regex =\n\t\t/(?[\\s\\S]*?)\\$\\$(?