text: import { edit, noop } from './utils'
  
  /* eslint-disable no-useless-escape */
  
  /**
   * Block-Level Rules
   */
  
  export const block = {
    newline: /^\n+/,
    code: /^( {4}[^\n]+\n*)+/,
    fences: /^ {0,3}(`{3,}(?=[^`\n]*\n)|~{3,})([^\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?:\n+|$)|$)/,
    hr: /^ {0,3}((?:- *){3,}|(?:_ *){3,}|(?:\* *){3,})(?:\n+|$)/,
    heading: /^ {0,3}(#{1,6})(?=\s|$)(.*)(?:\n+|$)/,
    blockquote: /^( {0,3}[>%:] ?(paragraph|[^\n]*)(?:\n|$))+/,
    list: /^( {0,3})(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
    html: '^ {0,3}(?:' + // optional indentation
      '<(script|pre|style)[\\s>][\\s\\S]*?(?:</\\1>[^\\n]*\\n+|$)' + // (1)
      '|comment[^\\n]*(\\n+|$)' + // (2)
      '|<\\?[\\s\\S]*?(?:\\?>\\n*|$)' + // (3)
      '|<![A-Z][\\s\\S]*?(?:>\\n*|$)' + // (4)
      '|<!\\[CDATA\\[[\\s\\S]*?(?:\\]\\]>\\n*|$)' + // (5)
      '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)' + // (6)
      '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=\\h*\\n)[\\s\\S]*?(?:\\n{2,}|$)' + // (7) open tag
      '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=\\h*\\n)[\\s\\S]*?(?:\\n{2,}|$)' + // (7) closing tag
      ')',
    def: /^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,
    nptable: noop,
    table: noop,
    lheading: /^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,
    // regex template, placeholders will be replaced according to different paragraph
    // interruption rules of commonmark and the original markdown spec:
    _paragraph: /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html)[^\n]+)*)/,
    text: /^[^\n]+/,
  
    // extra
    frontmatter: /^(?:(?:---\n([\s\S]+?)---)|(?:\+\+\+\n([\s\S]+?)\+\+\+)|(?:;;;\n([\s\S]+?);;;)|(?:\{\n([\s\S]+?)\}))(?:\n{2,}|\n{1,2}$)/,
    multiplemath: /^\$\$\n([\s\S]+?)\n\$\$(?:\n+|$)/,
    multiplemathGitlab: /^ {0,3}(`{3,})math\n(?:(|[\s\S]*?)\n)(?: {0,3}\1`* *(?:\n+|$)|$)/, // Math inside a code block (GitLab display math)
    footnote: /^\[\^([^\^\[\]\s]+?)\]:[\s\S]+?(?=\n *\n {0,3}[^ ]+|$)/
  }
  
  block._label = /(?!\s*\])(?:\\[\[\]]|[^\[\]])+/
  block._title = /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/
  block.def = edit(block.def)
    .replace('label', block._label)
    .replace('title', block._title)
    .getRegex()
  
  block.checkbox = /^\[([ xX])\] +/
  block.bullet = /(?:[*+-]|\d{1,9}(?:\.|\)))/ // patched: support "(" as ordered list delimiter too
  // patched: fix https://github.com/marktext/marktext/issues/831#issuecomment-477719256
  // block.item = /^( *)(bull) ?[^\n]*(?:\n(?!\1bull ?)[^\n]*)*/
  block.item = /^(( {0,3})(bull) [^\n]*(?:\n(?!(\2bull |\2bull\n))[^\n]*)*|( {0,3})(bull)(?:\n(?!(\2bull |\2bull\n)))*)/
  block.item = edit(block.item, 'gm')
    .replace(/bull/g, block.bullet)
    .getRegex()
  
  block.list = edit(block.list)
    .replace(/bull/g, block.bullet)
    .replace('hr', '\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))')
    .replace('def', '\\n+(?=' + block.def.source + ')')
    .getRegex()
  
  block._tag = 'address|article|aside|base|basefont|blockquote|body|caption' +
    '|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption' +
    '|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe' +
    '|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option' +
    '|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr' +
    '|track|ul'
  block._comment = /<!--(?!-?>)[\s\S]*?(?:-->|$)/
  block.html = edit(block.html, 'i')
    .replace('comment', block._comment)
    .replace('tag', block._tag)
    .replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/)
    .getRegex()
  
  block.paragraph = edit(block._paragraph)
    .replace('hr', block.hr)
    .replace('heading', ' {0,3}#{1,6} ')
    .replace('|lheading', '') // setex headings don't interrupt commonmark paragraphs
    .replace('blockquote', ' {0,3}[>%:]')
    .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
    .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
    .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
    .replace('tag', block._tag) // pars can be interrupted by type (6) html blocks
    .getRegex()
  
  block.blockquote = edit(block.blockquote)
    .replace('paragraph', block.paragraph)
    .getRegex()
  
  /**
   * Normal Block Grammar
   */
  
  export const normal = Object.assign({}, block)
  
  /**
   * GFM Block Grammar
   */
  
  export const gfm = Object.assign({}, normal, {
    nptable: '^ *([^|\\n ].*\\|.*)\\n' + // Header
      ' {0,3}([-:]+ *\\|[-| :]*)' + // Align
      '(?:\\n((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)', // Cells
    table: '^ *\\|(.+)\\n' + // Header
      ' {0,3}\\|?( *[-:]+[-| :]*)' + // Align
      '(?:\\n *((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)' // Cells
  })
  
  gfm.nptable = edit(gfm.nptable)
    .replace('hr', block.hr)
    .replace('heading', ' {0,3}#{1,6} ')
    .replace('blockquote', ' {0,3}[>%:]')
    .replace('code', ' {4}[^\\n]')
    .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
    .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
    .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
    .replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
    .getRegex()
  
  gfm.table = edit(gfm.table)
    .replace('hr', block.hr)
    .replace('heading', ' {0,3}#{1,6} ')
    .replace('blockquote', ' {0,3}[>%:]')
    .replace('code', ' {4}[^\\n]')
    .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
    .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
    .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
    .replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
    .getRegex()
  
  /**
   * Pedantic grammar (original John Gruber's loose markdown specification)
   */
  
  export const pedantic = Object.assign({}, normal, {
    html: edit(
      '^ *(?:comment *(?:\\n|\\s*$)' +
      '|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)' + // closed tag
      '|<tag(?:"[^"]*"|\'[^\']*\'|\\s[^\'"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))')
      .replace('comment', block._comment)
      .replace(/tag/g, '(?!(?:' +
        'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub' +
        '|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)' +
        '\\b)\\w+(?!:|[^\\w\\s@]*@)\\b')
      .getRegex(),
    def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,
    heading: /^(#{1,6})(.*)(?:\n+|$)/,
    fences: noop, // fences not supported
    paragraph: edit(normal._paragraph)
      .replace('hr', block.hr)
      .replace('heading', ' *#{1,6} *[^\n]')
      .replace('lheading', block.lheading)
      .replace('blockquote', ' {0,3}[>%:]')
      .replace('|fences', '')
      .replace('|list', '')
      .replace('|html', '')
      .getRegex()
  })
  
  /* eslint-ensable no-useless-escape */
  