303 lines
12 KiB
JavaScript
303 lines
12 KiB
JavaScript
import {
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noopTest,
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edit,
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merge
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} from './helpers.js';
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/**
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* Block-Level Grammar
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*/
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export const block = {
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newline: /^(?: *(?:\n|$))+/,
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code: /^( {4}[^\n]+(?:\n(?: *(?:\n|$))*)?)+/,
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fences: /^ {0,3}(`{3,}(?=[^`\n]*\n)|~{3,})([^\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?=\n|$)|$)/,
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hr: /^ {0,3}((?:-[\t ]*){3,}|(?:_[ \t]*){3,}|(?:\*[ \t]*){3,})(?:\n+|$)/,
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heading: /^ {0,3}(#{1,6})(?=\s|$)(.*)(?:\n+|$)/,
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blockquote: /^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/,
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list: /^( {0,3}bull)([ \t][^\n]+?)?(?:\n|$)/,
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html: '^ {0,3}(?:' // optional indentation
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+ '<(script|pre|style|textarea)[\\s>][\\s\\S]*?(?:</\\1>[^\\n]*\\n+|$)' // (1)
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+ '|comment[^\\n]*(\\n+|$)' // (2)
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+ '|<\\?[\\s\\S]*?(?:\\?>\\n*|$)' // (3)
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+ '|<![A-Z][\\s\\S]*?(?:>\\n*|$)' // (4)
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+ '|<!\\[CDATA\\[[\\s\\S]*?(?:\\]\\]>\\n*|$)' // (5)
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+ '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (6)
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+ '|<(?!script|pre|style|textarea)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (7) open tag
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+ '|</(?!script|pre|style|textarea)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (7) closing tag
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+ ')',
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def: /^ {0,3}\[(label)\]: *(?:\n *)?<?([^\s>]+)>?(?:(?: +(?:\n *)?| *\n *)(title))? *(?:\n+|$)/,
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table: noopTest,
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lheading: /^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,
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// regex template, placeholders will be replaced according to different paragraph
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// interruption rules of commonmark and the original markdown spec:
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_paragraph: /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html|table| +\n)[^\n]+)*)/,
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text: /^[^\n]+/
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};
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block._label = /(?!\s*\])(?:\\.|[^\[\]\\])+/;
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block._title = /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/;
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block.def = edit(block.def)
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.replace('label', block._label)
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.replace('title', block._title)
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.getRegex();
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block.bullet = /(?:[*+-]|\d{1,9}[.)])/;
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block.listItemStart = edit(/^( *)(bull) */)
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.replace('bull', block.bullet)
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.getRegex();
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block.list = edit(block.list)
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.replace(/bull/g, block.bullet)
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.replace('hr', '\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))')
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.replace('def', '\\n+(?=' + block.def.source + ')')
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.getRegex();
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block._tag = 'address|article|aside|base|basefont|blockquote|body|caption'
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+ '|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption'
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+ '|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe'
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+ '|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option'
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+ '|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr'
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+ '|track|ul';
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block._comment = /<!--(?!-?>)[\s\S]*?(?:-->|$)/;
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block.html = edit(block.html, 'i')
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.replace('comment', block._comment)
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.replace('tag', block._tag)
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.replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/)
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.getRegex();
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block.paragraph = edit(block._paragraph)
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.replace('hr', block.hr)
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.replace('heading', ' {0,3}#{1,6} ')
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.replace('|lheading', '') // setex headings don't interrupt commonmark paragraphs
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.replace('|table', '')
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.replace('blockquote', ' {0,3}>')
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.replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
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.replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
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.replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)')
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.replace('tag', block._tag) // pars can be interrupted by type (6) html blocks
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.getRegex();
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block.blockquote = edit(block.blockquote)
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.replace('paragraph', block.paragraph)
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.getRegex();
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/**
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* Normal Block Grammar
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*/
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block.normal = merge({}, block);
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/**
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* GFM Block Grammar
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*/
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block.gfm = merge({}, block.normal, {
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table: '^ *([^\\n ].*\\|.*)\\n' // Header
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+ ' {0,3}(?:\\| *)?(:?-+:? *(?:\\| *:?-+:? *)*)(?:\\| *)?' // Align
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+ '(?:\\n((?:(?! *\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)' // Cells
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});
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block.gfm.table = edit(block.gfm.table)
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.replace('hr', block.hr)
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.replace('heading', ' {0,3}#{1,6} ')
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.replace('blockquote', ' {0,3}>')
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.replace('code', ' {4}[^\\n]')
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.replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
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.replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
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.replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)')
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.replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
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.getRegex();
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block.gfm.paragraph = edit(block._paragraph)
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.replace('hr', block.hr)
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.replace('heading', ' {0,3}#{1,6} ')
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.replace('|lheading', '') // setex headings don't interrupt commonmark paragraphs
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.replace('table', block.gfm.table) // interrupt paragraphs with table
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.replace('blockquote', ' {0,3}>')
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.replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
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.replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
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.replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|textarea|!--)')
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.replace('tag', block._tag) // pars can be interrupted by type (6) html blocks
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.getRegex();
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/**
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* Pedantic grammar (original John Gruber's loose markdown specification)
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*/
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block.pedantic = merge({}, block.normal, {
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html: edit(
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'^ *(?:comment *(?:\\n|\\s*$)'
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+ '|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)' // closed tag
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+ '|<tag(?:"[^"]*"|\'[^\']*\'|\\s[^\'"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))')
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.replace('comment', block._comment)
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.replace(/tag/g, '(?!(?:'
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+ 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub'
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+ '|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)'
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+ '\\b)\\w+(?!:|[^\\w\\s@]*@)\\b')
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.getRegex(),
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def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,
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heading: /^(#{1,6})(.*)(?:\n+|$)/,
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fences: noopTest, // fences not supported
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paragraph: edit(block.normal._paragraph)
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.replace('hr', block.hr)
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.replace('heading', ' *#{1,6} *[^\n]')
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.replace('lheading', block.lheading)
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.replace('blockquote', ' {0,3}>')
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.replace('|fences', '')
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.replace('|list', '')
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.replace('|html', '')
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.getRegex()
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});
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/**
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* Inline-Level Grammar
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*/
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export const inline = {
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escape: /^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,
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autolink: /^<(scheme:[^\s\x00-\x1f<>]*|email)>/,
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url: noopTest,
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tag: '^comment'
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+ '|^</[a-zA-Z][\\w:-]*\\s*>' // self-closing tag
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+ '|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>' // open tag
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+ '|^<\\?[\\s\\S]*?\\?>' // processing instruction, e.g. <?php ?>
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+ '|^<![a-zA-Z]+\\s[\\s\\S]*?>' // declaration, e.g. <!DOCTYPE html>
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+ '|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>', // CDATA section
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link: /^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,
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reflink: /^!?\[(label)\]\[(ref)\]/,
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nolink: /^!?\[(ref)\](?:\[\])?/,
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reflinkSearch: 'reflink|nolink(?!\\()',
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emStrong: {
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lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
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// (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left. (5) and (6) can be either Left or Right.
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// () Skip orphan inside strong () Consume to delim (1) #*** (2) a***#, a*** (3) #***a, ***a (4) ***# (5) #***# (6) a***a
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rDelimAst: /^[^_*]*?\_\_[^_*]*?\*[^_*]*?(?=\_\_)|[^*]+(?=[^*])|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
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rDelimUnd: /^[^_*]*?\*\*[^_*]*?\_[^_*]*?(?=\*\*)|[^_]+(?=[^_])|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
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},
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code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
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br: /^( {2,}|\\)\n(?!\s*$)/,
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del: noopTest,
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text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
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punctuation: /^([\spunctuation])/
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};
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// list of punctuation marks from CommonMark spec
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// without * and _ to handle the different emphasis markers * and _
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inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
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inline.punctuation = edit(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex();
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// sequences em should skip over [title](link), `code`, <html>
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inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
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inline.escapedEmSt = /\\\*|\\_/g;
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inline._comment = edit(block._comment).replace('(?:-->|$)', '-->').getRegex();
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inline.emStrong.lDelim = edit(inline.emStrong.lDelim)
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.replace(/punct/g, inline._punctuation)
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.getRegex();
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inline.emStrong.rDelimAst = edit(inline.emStrong.rDelimAst, 'g')
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.replace(/punct/g, inline._punctuation)
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.getRegex();
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inline.emStrong.rDelimUnd = edit(inline.emStrong.rDelimUnd, 'g')
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.replace(/punct/g, inline._punctuation)
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.getRegex();
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inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
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inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
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inline._email = /[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/;
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inline.autolink = edit(inline.autolink)
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.replace('scheme', inline._scheme)
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.replace('email', inline._email)
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.getRegex();
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inline._attribute = /\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/;
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inline.tag = edit(inline.tag)
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.replace('comment', inline._comment)
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.replace('attribute', inline._attribute)
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.getRegex();
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inline._label = /(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/;
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inline._href = /<(?:\\.|[^\n<>\\])+>|[^\s\x00-\x1f]*/;
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inline._title = /"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/;
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inline.link = edit(inline.link)
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.replace('label', inline._label)
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.replace('href', inline._href)
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.replace('title', inline._title)
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.getRegex();
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inline.reflink = edit(inline.reflink)
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.replace('label', inline._label)
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.replace('ref', block._label)
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.getRegex();
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inline.nolink = edit(inline.nolink)
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.replace('ref', block._label)
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.getRegex();
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inline.reflinkSearch = edit(inline.reflinkSearch, 'g')
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.replace('reflink', inline.reflink)
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.replace('nolink', inline.nolink)
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.getRegex();
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/**
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* Normal Inline Grammar
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*/
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inline.normal = merge({}, inline);
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/**
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* Pedantic Inline Grammar
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*/
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inline.pedantic = merge({}, inline.normal, {
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strong: {
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start: /^__|\*\*/,
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middle: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
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endAst: /\*\*(?!\*)/g,
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endUnd: /__(?!_)/g
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},
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em: {
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start: /^_|\*/,
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middle: /^()\*(?=\S)([\s\S]*?\S)\*(?!\*)|^_(?=\S)([\s\S]*?\S)_(?!_)/,
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endAst: /\*(?!\*)/g,
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endUnd: /_(?!_)/g
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},
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link: edit(/^!?\[(label)\]\((.*?)\)/)
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.replace('label', inline._label)
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.getRegex(),
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reflink: edit(/^!?\[(label)\]\s*\[([^\]]*)\]/)
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.replace('label', inline._label)
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.getRegex()
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});
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/**
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* GFM Inline Grammar
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*/
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inline.gfm = merge({}, inline.normal, {
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escape: edit(inline.escape).replace('])', '~|])').getRegex(),
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_extended_email: /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,
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url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
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_backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
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del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
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text: /^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/
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});
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inline.gfm.url = edit(inline.gfm.url, 'i')
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.replace('email', inline.gfm._extended_email)
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.getRegex();
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/**
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* GFM + Line Breaks Inline Grammar
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*/
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inline.breaks = merge({}, inline.gfm, {
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br: edit(inline.br).replace('{2,}', '*').getRegex(),
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text: edit(inline.gfm.text)
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.replace('\\b_', '\\b_| {2,}\\n')
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.replace(/\{2,\}/g, '*')
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.getRegex()
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});
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