reveal.js/plugin/markdown/marked.js

/**
 * marked - a markdown parser
 * Copyright (c) 2011-2020, Christopher Jeffrey. (MIT Licensed)
 * https://github.com/markedjs/marked
 */

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var defaults = createCommonjsModule(function (module) {
function getDefaults() {
  return {
    baseUrl: null,
    breaks: false,
    gfm: true,
    headerIds: true,
    headerPrefix: '',
    highlight: null,
    langPrefix: 'language-',
    mangle: true,
    pedantic: false,
    renderer: null,
    sanitize: false,
    sanitizer: null,
    silent: false,
    smartLists: false,
    smartypants: false,
    xhtml: false
  };
}

function changeDefaults(newDefaults) {
  module.exports.defaults = newDefaults;
}

module.exports = {
  defaults: getDefaults(),
  getDefaults,
  changeDefaults
};
});
var defaults_1 = defaults.defaults;
var defaults_2 = defaults.getDefaults;
var defaults_3 = defaults.changeDefaults;

/**
 * Helpers
 */
const escapeTest = /[&<>"']/;
const escapeReplace = /[&<>"']/g;
const escapeTestNoEncode = /[<>"']|&(?!#?\w+;)/;
const escapeReplaceNoEncode = /[<>"']|&(?!#?\w+;)/g;
const escapeReplacements = {
  '&': '&amp;',
  '<': '&lt;',
  '>': '&gt;',
  '"': '&quot;',
  "'": '&#39;'
};
const getEscapeReplacement = (ch) => escapeReplacements[ch];
function escape(html, encode) {
  if (encode) {
    if (escapeTest.test(html)) {
      return html.replace(escapeReplace, getEscapeReplacement);
    }
  } else {
    if (escapeTestNoEncode.test(html)) {
      return html.replace(escapeReplaceNoEncode, getEscapeReplacement);
    }
  }

  return html;
}

const unescapeTest = /&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/ig;

function unescape(html) {
  // explicitly match decimal, hex, and named HTML entities
  return html.replace(unescapeTest, (_, n) => {
    n = n.toLowerCase();
    if (n === 'colon') return ':';
    if (n.charAt(0) === '#') {
      return n.charAt(1) === 'x'
        ? String.fromCharCode(parseInt(n.substring(2), 16))
        : String.fromCharCode(+n.substring(1));
    }
    return '';
  });
}

const caret = /(^|[^\[])\^/g;
function edit(regex, opt) {
  regex = regex.source || regex;
  opt = opt || '';
  const obj = {
    replace: (name, val) => {
      val = val.source || val;
      val = val.replace(caret, '$1');
      regex = regex.replace(name, val);
      return obj;
    },
    getRegex: () => {
      return new RegExp(regex, opt);
    }
  };
  return obj;
}

const nonWordAndColonTest = /[^\w:]/g;
const originIndependentUrl = /^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;
function cleanUrl(sanitize, base, href) {
  if (sanitize) {
    let prot;
    try {
      prot = decodeURIComponent(unescape(href))
        .replace(nonWordAndColonTest, '')
        .toLowerCase();
    } catch (e) {
      return null;
    }
    if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
      return null;
    }
  }
  if (base && !originIndependentUrl.test(href)) {
    href = resolveUrl(base, href);
  }
  try {
    href = encodeURI(href).replace(/%25/g, '%');
  } catch (e) {
    return null;
  }
  return href;
}

const baseUrls = {};
const justDomain = /^[^:]+:\/*[^/]*$/;
const protocol = /^([^:]+:)[\s\S]*$/;
const domain = /^([^:]+:\/*[^/]*)[\s\S]*$/;

function resolveUrl(base, href) {
  if (!baseUrls[' ' + base]) {
    // we can ignore everything in base after the last slash of its path component,
    // but we might need to add _that_
    // https://tools.ietf.org/html/rfc3986#section-3
    if (justDomain.test(base)) {
      baseUrls[' ' + base] = base + '/';
    } else {
      baseUrls[' ' + base] = rtrim(base, '/', true);
    }
  }
  base = baseUrls[' ' + base];
  const relativeBase = base.indexOf(':') === -1;

  if (href.substring(0, 2) === '//') {
    if (relativeBase) {
      return href;
    }
    return base.replace(protocol, '$1') + href;
  } else if (href.charAt(0) === '/') {
    if (relativeBase) {
      return href;
    }
    return base.replace(domain, '$1') + href;
  } else {
    return base + href;
  }
}

const noopTest = { exec: function noopTest() {} };

function merge(obj) {
  let i = 1,
    target,
    key;

  for (; i < arguments.length; i++) {
    target = arguments[i];
    for (key in target) {
      if (Object.prototype.hasOwnProperty.call(target, key)) {
        obj[key] = target[key];
      }
    }
  }

  return obj;
}

function splitCells(tableRow, count) {
  // ensure that every cell-delimiting pipe has a space
  // before it to distinguish it from an escaped pipe
  const row = tableRow.replace(/\|/g, (match, offset, str) => {
      let escaped = false,
        curr = offset;
      while (--curr >= 0 && str[curr] === '\\') escaped = !escaped;
      if (escaped) {
        // odd number of slashes means | is escaped
        // so we leave it alone
        return '|';
      } else {
        // add space before unescaped |
        return ' |';
      }
    }),
    cells = row.split(/ \|/);
  let i = 0;

  if (cells.length > count) {
    cells.splice(count);
  } else {
    while (cells.length < count) cells.push('');
  }

  for (; i < cells.length; i++) {
    // leading or trailing whitespace is ignored per the gfm spec
    cells[i] = cells[i].trim().replace(/\\\|/g, '|');
  }
  return cells;
}

// Remove trailing 'c's. Equivalent to str.replace(/c*$/, '').
// /c*$/ is vulnerable to REDOS.
// invert: Remove suffix of non-c chars instead. Default falsey.
function rtrim(str, c, invert) {
  const l = str.length;
  if (l === 0) {
    return '';
  }

  // Length of suffix matching the invert condition.
  let suffLen = 0;

  // Step left until we fail to match the invert condition.
  while (suffLen < l) {
    const currChar = str.charAt(l - suffLen - 1);
    if (currChar === c && !invert) {
      suffLen++;
    } else if (currChar !== c && invert) {
      suffLen++;
    } else {
      break;
    }
  }

  return str.substr(0, l - suffLen);
}

function findClosingBracket(str, b) {
  if (str.indexOf(b[1]) === -1) {
    return -1;
  }
  const l = str.length;
  let level = 0,
    i = 0;
  for (; i < l; i++) {
    if (str[i] === '\\') {
      i++;
    } else if (str[i] === b[0]) {
      level++;
    } else if (str[i] === b[1]) {
      level--;
      if (level < 0) {
        return i;
      }
    }
  }
  return -1;
}

function checkSanitizeDeprecation(opt) {
  if (opt && opt.sanitize && !opt.silent) {
    console.warn('marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. Read more here: https://marked.js.org/#/USING_ADVANCED.md#options');
  }
}

var helpers = {
  escape,
  unescape,
  edit,
  cleanUrl,
  resolveUrl,
  noopTest,
  merge,
  splitCells,
  rtrim,
  findClosingBracket,
  checkSanitizeDeprecation
};

const {
  noopTest: noopTest$1,
  edit: edit$1,
  merge: merge$1
} = helpers;

/**
 * Block-Level Grammar
 */
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+|$)/,
  heading: /^ {0,3}(#{1,6}) +([^\n]*?)(?: +#+)? *(?:\n+|$)/,
  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,}|$)' // (6)
    + '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) open tag
    + '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) closing tag
    + ')',
  def: /^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,
  nptable: noopTest$1,
  table: noopTest$1,
  lheading: /^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,
  // 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]+/
};

block._label = /(?!\s*\])(?:\\[\[\]]|[^\[\]])+/;
block._title = /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/;
block.def = edit$1(block.def)
  .replace('label', block._label)
  .replace('title', block._title)
  .getRegex();

block.bullet = /(?:[*+-]|\d{1,9}\.)/;
block.item = /^( *)(bull) ?[^\n]*(?:\n(?!\1bull ?)[^\n]*)*/;
block.item = edit$1(block.item, 'gm')
  .replace(/bull/g, block.bullet)
  .getRegex();

block.list = edit$1(block.list)
  .replace(/bull/g, block.bullet)
  .replace('hr', '\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))')
  .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$1(block.html, 'i')
  .replace('comment', block._comment)
  .replace('tag', block._tag)
  .replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/)
  .getRegex();

block.paragraph = edit$1(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$1(block.blockquote)
  .replace('paragraph', block.paragraph)
  .getRegex();

/**
 * Normal Block Grammar
 */

block.normal = merge$1({}, block);

/**
 * GFM Block Grammar
 */

block.gfm = merge$1({}, block.normal, {
  nptable: '^ *([^|\\n ].*\\|.*)\\n' // Header
    + ' *([-:]+ *\\|[-| :]*)' // Align
    + '(?:\\n((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)', // Cells
  table: '^ *\\|(.+)\\n' // Header
    + ' *\\|?( *[-:]+[-| :]*)' // Align
    + '(?:\\n *((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)' // Cells
});

block.gfm.nptable = edit$1(block.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();

block.gfm.table = edit$1(block.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)
 */

block.pedantic = merge$1({}, block.normal, {
  html: edit$1(
    '^ *(?:comment *(?:\\n|\\s*$)'
    + '|<(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+|$)/,
  heading: /^ *(#{1,6}) *([^\n]+?) *(?:#+ *)?(?:\n+|$)/,
  fences: noopTest$1, // fences not supported
  paragraph: edit$1(block.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()
});

/**
 * Inline-Level Grammar
 */
const inline = {
  escape: /^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,
  autolink: /^<(scheme:[^\s\x00-\x1f<>]*|email)>/,
  url: noopTest$1,
  tag: '^comment'
    + '|^</[a-zA-Z][\\w:-]*\\s*>' // self-closing tag
    + '|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>' // open tag
    + '|^<\\?[\\s\\S]*?\\?>' // processing instruction, e.g. <?php ?>
    + '|^<![a-zA-Z]+\\s[\\s\\S]*?>' // declaration, e.g. <!DOCTYPE html>
    + '|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>', // CDATA section
  link: /^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,
  reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
  nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
  strong: /^__([^\s_])__(?!_)|^\*\*([^\s*])\*\*(?!\*)|^__([^\s][\s\S]*?[^\s])__(?!_)|^\*\*([^\s][\s\S]*?[^\s])\*\*(?!\*)/,
  em: /^_([^\s_])_(?!_)|^_([^\s_<][\s\S]*?[^\s_])_(?!_|[^\spunctuation])|^_([^\s_<][\s\S]*?[^\s])_(?!_|[^\spunctuation])|^\*([^\s*<\[])\*(?!\*)|^\*([^\s<"][\s\S]*?[^\s\[\*])\*(?![\]`punctuation])|^\*([^\s*"<\[][\s\S]*[^\s])\*(?!\*)/,
  code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
  br: /^( {2,}|\\)\n(?!\s*$)/,
  del: noopTest$1,
  text: /^(`+|[^`])(?:[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n))|(?= {2,}\n))/
};

// list of punctuation marks from common mark spec
// without ` and ] to workaround Rule 17 (inline code blocks/links)
inline._punctuation = '!"#$%&\'()*+\\-./:;<=>?@\\[^_{|}~';
inline.em = edit$1(inline.em).replace(/punctuation/g, inline._punctuation).getRegex();

inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;

inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
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])?)+(?![-_])/;
inline.autolink = edit$1(inline.autolink)
  .replace('scheme', inline._scheme)
  .replace('email', inline._email)
  .getRegex();

inline._attribute = /\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/;

inline.tag = edit$1(inline.tag)
  .replace('comment', block._comment)
  .replace('attribute', inline._attribute)
  .getRegex();

inline._label = /(?:\[[^\[\]]*\]|\\.|`[^`]*`|[^\[\]\\`])*?/;
inline._href = /<(?:\\[<>]?|[^\s<>\\])*>|[^\s\x00-\x1f]*/;
inline._title = /"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/;

inline.link = edit$1(inline.link)
  .replace('label', inline._label)
  .replace('href', inline._href)
  .replace('title', inline._title)
  .getRegex();

inline.reflink = edit$1(inline.reflink)
  .replace('label', inline._label)
  .getRegex();

/**
 * Normal Inline Grammar
 */

inline.normal = merge$1({}, inline);

/**
 * Pedantic Inline Grammar
 */

inline.pedantic = merge$1({}, inline.normal, {
  strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
  em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/,
  link: edit$1(/^!?\[(label)\]\((.*?)\)/)
    .replace('label', inline._label)
    .getRegex(),
  reflink: edit$1(/^!?\[(label)\]\s*\[([^\]]*)\]/)
    .replace('label', inline._label)
    .getRegex()
});

/**
 * GFM Inline Grammar
 */

inline.gfm = merge$1({}, inline.normal, {
  escape: edit$1(inline.escape).replace('])', '~|])').getRegex(),
  _extended_email: /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,
  url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
  _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
  del: /^~+(?=\S)([\s\S]*?\S)~+/,
  text: /^(`+|[^`])(?:[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?= {2,}\n|[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
});

inline.gfm.url = edit$1(inline.gfm.url, 'i')
  .replace('email', inline.gfm._extended_email)
  .getRegex();
/**
 * GFM + Line Breaks Inline Grammar
 */

inline.breaks = merge$1({}, inline.gfm, {
  br: edit$1(inline.br).replace('{2,}', '*').getRegex(),
  text: edit$1(inline.gfm.text)
    .replace('\\b_', '\\b_| {2,}\\n')
    .replace(/\{2,\}/g, '*')
    .getRegex()
});

var rules = {
  block,
  inline
};

const { defaults: defaults$1 } = defaults;
const { block: block$1, inline: inline$1 } = rules;
const {
  rtrim: rtrim$1,
  splitCells: splitCells$1,
  escape: escape$1,
  findClosingBracket: findClosingBracket$1
} = helpers;

/**
 * Block Lexer
 */
var Lexer_1 = class Lexer {
  constructor(options) {
    this.tokens = [];
    this.tokens.links = Object.create(null);
    this.options = options || defaults$1;
    this.rules = {
      block: block$1.normal,
      inline: inline$1.normal
    };

    if (this.options.pedantic) {
      this.rules.block = block$1.pedantic;
      this.rules.inline = inline$1.pedantic;
    } else if (this.options.gfm) {
      this.rules.block = block$1.gfm;
      if (this.options.breaks) {
        this.rules.inline = inline$1.breaks;
      } else {
        this.rules.inline = inline$1.gfm;
      }
    }
  }

  /**
   * Expose Block Rules
   */
  static get rules() {
    return {
      block: block$1,
      inline: inline$1
    };
  }

  /**
   * Static Lex Method
   */
  static lex(src, options) {
    const lexer = new Lexer(options);
    return lexer.lex(src);
  }

  /**
   * Preprocessing
   */
  lex(src) {
    src = src
      .replace(/\r\n|\r/g, '\n')
      .replace(/\t/g, '    ');

    this.blockTokens(src, this.tokens);

    this.inline(this.tokens);

    return this.tokens;
  }

  /**
   * Lexing
   */
  blockTokens(src, tokens, top = true) {
    src = src.replace(/^ +$/gm, '');
    let next,
      loose,
      cap,
      bull,
      b,
      item,
      list,
      space,
      i,
      tag,
      l,
      isordered,
      istask,
      ischecked,
      lastToken,
      addBack,
      raw;

    while (src) {
      // newline
      if (cap = this.rules.block.newline.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        if (cap[0].length > 1) {
          tokens.push({
            type: 'space',
            raw
          });
        }
      }

      // code
      if (cap = this.rules.block.code.exec(src)) {
        lastToken = tokens[tokens.length - 1];
        src = src.substring(cap[0].length);
        raw = cap[0];
        // An indented code block cannot interrupt a paragraph.
        if (lastToken && lastToken.type === 'paragraph') {
          lastToken.text += '\n' + cap[0].trimRight();
          lastToken.raw += '\n' + raw;
        } else {
          cap = cap[0].replace(/^ {4}/gm, '');
          tokens.push({
            type: 'code',
            raw,
            codeBlockStyle: 'indented',
            text: !this.options.pedantic
              ? rtrim$1(cap, '\n')
              : cap
          });
        }
        continue;
      }

      // fences
      if (cap = this.rules.block.fences.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'code',
          raw,
          lang: cap[2] ? cap[2].trim() : cap[2],
          text: cap[3] || ''
        });
        continue;
      }

      // heading
      if (cap = this.rules.block.heading.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'heading',
          raw,
          depth: cap[1].length,
          text: cap[2]
        });
        continue;
      }

      // table no leading pipe (gfm)
      if (cap = this.rules.block.nptable.exec(src)) {
        item = {
          type: 'table',
          header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
          align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
          cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : []
        };

        if (item.header.length === item.align.length) {
          src = src.substring(cap[0].length);
          raw = cap[0];
          item.raw = raw;

          l = item.align.length;
          for (i = 0; i < l; i++) {
            if (/^ *-+: *$/.test(item.align[i])) {
              item.align[i] = 'right';
            } else if (/^ *:-+: *$/.test(item.align[i])) {
              item.align[i] = 'center';
            } else if (/^ *:-+ *$/.test(item.align[i])) {
              item.align[i] = 'left';
            } else {
              item.align[i] = null;
            }
          }

          l = item.cells.length;
          for (i = 0; i < l; i++) {
            item.cells[i] = splitCells$1(item.cells[i], item.header.length);
          }

          tokens.push(item);

          continue;
        }
      }

      // hr
      if (cap = this.rules.block.hr.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'hr',
          raw
        });
        continue;
      }

      // blockquote
      if (cap = this.rules.block.blockquote.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];

        cap = cap[0].replace(/^ *> ?/gm, '');

        tokens.push({
          type: 'blockquote',
          raw,
          tokens: this.blockTokens(cap, [], top)
        });

        continue;
      }

      // list
      if (cap = this.rules.block.list.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        bull = cap[2];
        isordered = bull.length > 1;

        list = {
          type: 'list',
          raw,
          ordered: isordered,
          start: isordered ? +bull : '',
          loose: false,
          items: []
        };

        tokens.push(list);

        // Get each top-level item.
        cap = cap[0].match(this.rules.block.item);

        next = false;

        l = cap.length;
        for (i = 0; i < l; i++) {
          item = cap[i];
          raw = item.trim();

          // Remove the list item's bullet
          // so it is seen as the next token.
          space = item.length;
          item = item.replace(/^ *([*+-]|\d+\.) */, '');

          // Outdent whatever the
          // list item contains. Hacky.
          if (~item.indexOf('\n ')) {
            space -= item.length;
            item = !this.options.pedantic
              ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
              : item.replace(/^ {1,4}/gm, '');
          }

          // Determine whether the next list item belongs here.
          // Backpedal if it does not belong in this list.
          if (i !== l - 1) {
            b = block$1.bullet.exec(cap[i + 1])[0];
            if (bull.length > 1 ? b.length === 1
              : (b.length > 1 || (this.options.smartLists && b !== bull))) {
              addBack = cap.slice(i + 1).join('\n');
              src = addBack + src;
              list.raw = list.raw.substring(list.raw.length - addBack.length);
              i = l - 1;
            }
          }

          // Determine whether item is loose or not.
          // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
          // for discount behavior.
          loose = next || /\n\n(?!\s*$)/.test(item);
          if (i !== l - 1) {
            next = item.charAt(item.length - 1) === '\n';
            if (!loose) loose = next;
          }

          if (loose) {
            list.loose = true;
          }

          // Check for task list items
          istask = /^\[[ xX]\] /.test(item);
          ischecked = undefined;
          if (istask) {
            ischecked = item[1] !== ' ';
            item = item.replace(/^\[[ xX]\] +/, '');
          }

          list.items.push({
            raw,
            task: istask,
            checked: ischecked,
            loose: loose,
            tokens: this.blockTokens(item, [], false)
          });
        }

        continue;
      }

      // html
      if (cap = this.rules.block.html.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: this.options.sanitize
            ? 'paragraph'
            : 'html',
          raw,
          pre: !this.options.sanitizer
            && (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
          text: this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape$1(cap[0])) : cap[0]
        });
        continue;
      }

      // def
      if (top && (cap = this.rules.block.def.exec(src))) {
        src = src.substring(cap[0].length);
        if (cap[3]) cap[3] = cap[3].substring(1, cap[3].length - 1);
        tag = cap[1].toLowerCase().replace(/\s+/g, ' ');
        if (!this.tokens.links[tag]) {
          this.tokens.links[tag] = {
            href: cap[2],
            title: cap[3]
          };
        }
        continue;
      }

      // table (gfm)
      if (cap = this.rules.block.table.exec(src)) {
        item = {
          type: 'table',
          header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
          align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
          cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : []
        };

        if (item.header.length === item.align.length) {
          src = src.substring(cap[0].length);
          item.raw = cap[0];

          l = item.align.length;
          for (i = 0; i < l; i++) {
            if (/^ *-+: *$/.test(item.align[i])) {
              item.align[i] = 'right';
            } else if (/^ *:-+: *$/.test(item.align[i])) {
              item.align[i] = 'center';
            } else if (/^ *:-+ *$/.test(item.align[i])) {
              item.align[i] = 'left';
            } else {
              item.align[i] = null;
            }
          }

          l = item.cells.length;
          for (i = 0; i < l; i++) {
            item.cells[i] = splitCells$1(
              item.cells[i].replace(/^ *\| *| *\| *$/g, ''),
              item.header.length);
          }

          tokens.push(item);

          continue;
        }
      }

      // lheading
      if (cap = this.rules.block.lheading.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'heading',
          raw,
          depth: cap[2].charAt(0) === '=' ? 1 : 2,
          text: cap[1]
        });
        continue;
      }

      // top-level paragraph
      if (top && (cap = this.rules.block.paragraph.exec(src))) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'paragraph',
          raw,
          text: cap[1].charAt(cap[1].length - 1) === '\n'
            ? cap[1].slice(0, -1)
            : cap[1]
        });
        continue;
      }

      // text
      if (cap = this.rules.block.text.exec(src)) {
        // Top-level should never reach here.
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'text',
          raw,
          text: cap[0]
        });
        continue;
      }

      if (src) {
        const errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
        if (this.options.silent) {
          console.error(errMsg);
        } else {
          throw new Error(errMsg);
        }
      }
    }

    return tokens;
  }

  inline(tokens) {
    let i,
      j,
      k,
      l2,
      row,
      token;

    const l = tokens.length;
    for (i = 0; i < l; i++) {
      token = tokens[i];
      switch (token.type) {
        case 'paragraph':
        case 'text':
        case 'heading': {
          token.tokens = [];
          this.inlineTokens(token.text, token.tokens);
          break;
        }
        case 'table': {
          token.tokens = {
            header: [],
            cells: []
          };

          // header
          l2 = token.header.length;
          for (j = 0; j < l2; j++) {
            token.tokens.header[j] = [];
            this.inlineTokens(token.header[j], token.tokens.header[j]);
          }

          // cells
          l2 = token.cells.length;
          for (j = 0; j < l2; j++) {
            row = token.cells[j];
            token.tokens.cells[j] = [];
            for (k = 0; k < row.length; k++) {
              token.tokens.cells[j][k] = [];
              this.inlineTokens(row[k], token.tokens.cells[j][k]);
            }
          }

          break;
        }
        case 'blockquote': {
          this.inline(token.tokens);
          break;
        }
        case 'list': {
          l2 = token.items.length;
          for (j = 0; j < l2; j++) {
            this.inline(token.items[j].tokens);
          }
          break;
        }
      }
    }

    return tokens;
  }

  /**
   * Lexing/Compiling
   */
  inlineTokens(src, tokens) {
    let out = '',
      link,
      text,
      newTokens,
      href,
      title,
      cap,
      prevCapZero,
      lastParenIndex,
      start,
      linkLen,
      raw;

    while (src) {
      // escape
      if (cap = this.rules.inline.escape.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        text = escape$1(cap[1]);
        out += text;
        tokens.push({
          type: 'escape',
          raw,
          text
        });
        continue;
      }

      // tag
      if (cap = this.rules.inline.tag.exec(src)) {
        if (!this.inLink && /^<a /i.test(cap[0])) {
          this.inLink = true;
        } else if (this.inLink && /^<\/a>/i.test(cap[0])) {
          this.inLink = false;
        }
        if (!this.inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
          this.inRawBlock = true;
        } else if (this.inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
          this.inRawBlock = false;
        }

        src = src.substring(cap[0].length);
        raw = cap[0];
        text = this.options.sanitize
          ? (this.options.sanitizer
            ? this.options.sanitizer(cap[0])
            : escape$1(cap[0]))
          : cap[0];
        tokens.push({
          type: this.options.sanitize
            ? 'text'
            : 'html',
          raw,
          text
        });
        out += text;
        continue;
      }

      // link
      if (cap = this.rules.inline.link.exec(src)) {
        lastParenIndex = findClosingBracket$1(cap[2], '()');
        if (lastParenIndex > -1) {
          start = cap[0].indexOf('!') === 0 ? 5 : 4;
          linkLen = start + cap[1].length + lastParenIndex;
          cap[2] = cap[2].substring(0, lastParenIndex);
          cap[0] = cap[0].substring(0, linkLen).trim();
          cap[3] = '';
        }
        src = src.substring(cap[0].length);
        raw = cap[0];
        this.inLink = true;
        href = cap[2];
        if (this.options.pedantic) {
          link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);

          if (link) {
            href = link[1];
            title = link[3];
          } else {
            title = '';
          }
        } else {
          title = cap[3] ? cap[3].slice(1, -1) : '';
        }
        href = href.trim().replace(/^<([\s\S]*)>$/, '$1');
        out += this.outputLink(cap, {
          href: this.escapes(href),
          title: this.escapes(title)
        }, tokens, raw);
        this.inLink = false;
        continue;
      }

      // reflink, nolink
      if ((cap = this.rules.inline.reflink.exec(src))
          || (cap = this.rules.inline.nolink.exec(src))) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
        link = this.tokens.links[link.toLowerCase()];
        if (!link || !link.href) {
          text = cap[0].charAt(0);
          out += text;
          tokens.push({
            type: 'text',
            raw: text,
            text
          });
          src = cap[0].substring(1) + src;
          continue;
        }
        this.inLink = true;
        out += this.outputLink(cap, link, tokens, raw);
        this.inLink = false;
        continue;
      }

      // strong
      if (cap = this.rules.inline.strong.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        newTokens = tokens ? [] : null;
        text = this.inlineTokens(cap[4] || cap[3] || cap[2] || cap[1], newTokens);

        tokens.push({
          type: 'strong',
          raw,
          text,
          tokens: newTokens
        });
        out += text;
        continue;
      }

      // em
      if (cap = this.rules.inline.em.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        newTokens = tokens ? [] : null;
        text = this.inlineTokens(cap[6] || cap[5] || cap[4] || cap[3] || cap[2] || cap[1], newTokens);
        tokens.push({
          type: 'em',
          raw,
          text,
          tokens: newTokens
        });
        out += text;
        continue;
      }

      // code
      if (cap = this.rules.inline.code.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        text = escape$1(cap[2].trim(), true);
        tokens.push({
          type: 'codespan',
          raw,
          text
        });
        out += text;
        continue;
      }

      // br
      if (cap = this.rules.inline.br.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'br',
          raw
        });
        out += '\n';
        continue;
      }

      // del (gfm)
      if (cap = this.rules.inline.del.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        newTokens = tokens ? [] : null;
        text = this.inlineTokens(cap[1], newTokens);
        tokens.push({
          type: 'del',
          raw,
          text,
          tokens: newTokens
        });
        out += text;
        continue;
      }

      // autolink
      if (cap = this.rules.inline.autolink.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        if (cap[2] === '@') {
          text = escape$1(this.options.mangle ? this.mangle(cap[1]) : cap[1]);
          href = 'mailto:' + text;
        } else {
          text = escape$1(cap[1]);
          href = text;
        }
        tokens.push({
          type: 'link',
          raw,
          text,
          href,
          tokens: [
            {
              type: 'text',
              raw: text,
              text
            }
          ]
        });
        out += text;
        continue;
      }

      // url (gfm)
      if (!this.inLink && (cap = this.rules.inline.url.exec(src))) {
        if (cap[2] === '@') {
          text = escape$1(this.options.mangle ? this.mangle(cap[0]) : cap[0]);
          href = 'mailto:' + text;
        } else {
          // do extended autolink path validation
          do {
            prevCapZero = cap[0];
            cap[0] = this.rules.inline._backpedal.exec(cap[0])[0];
          } while (prevCapZero !== cap[0]);
          text = escape$1(cap[0]);
          if (cap[1] === 'www.') {
            href = 'http://' + text;
          } else {
            href = text;
          }
        }
        src = src.substring(cap[0].length);
        raw = cap[0];
        tokens.push({
          type: 'link',
          raw,
          text,
          href,
          tokens: [
            {
              type: 'text',
              raw: text,
              text
            }
          ]
        });
        out += text;
        continue;
      }

      // text
      if (cap = this.rules.inline.text.exec(src)) {
        src = src.substring(cap[0].length);
        raw = cap[0];
        if (this.inRawBlock) {
          text = this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape$1(cap[0])) : cap[0];
        } else {
          text = escape$1(this.options.smartypants ? this.smartypants(cap[0]) : cap[0]);
        }
        tokens.push({
          type: 'text',
          raw,
          text
        });
        out += text;
        continue;
      }

      if (src) {
        const errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
        if (this.options.silent) {
          console.error(errMsg);
        } else {
          throw new Error(errMsg);
        }
      }
    }

    return out;
  }

  escapes(text) {
    return text ? text.replace(inline$1._escapes, '$1') : text;
  }

  /**
   * tokenize Link
   */
  outputLink(cap, link, tokens, raw) {
    const href = link.href;
    const title = link.title ? escape$1(link.title) : null;
    const newTokens = tokens ? [] : null;

    if (cap[0].charAt(0) !== '!') {
      const text = this.inlineTokens(cap[1], newTokens);
      tokens.push({
        type: 'link',
        raw,
        text,
        href,
        title,
        tokens: newTokens
      });
      return text;
    } else {
      const text = escape$1(cap[1]);
      tokens.push({
        type: 'image',
        raw,
        text,
        href,
        title
      });
      return text;
    }
  }

  /**
   * Smartypants Transformations
   */
  smartypants(text) {
    return text
      // em-dashes
      .replace(/---/g, '\u2014')
      // en-dashes
      .replace(/--/g, '\u2013')
      // opening singles
      .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
      // closing singles & apostrophes
      .replace(/'/g, '\u2019')
      // opening doubles
      .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
      // closing doubles
      .replace(/"/g, '\u201d')
      // ellipses
      .replace(/\.{3}/g, '\u2026');
  }

  /**
   * Mangle Links
   */
  mangle(text) {
    let out = '',
      i,
      ch;

    const l = text.length;
    for (i = 0; i < l; i++) {
      ch = text.charCodeAt(i);
      if (Math.random() > 0.5) {
        ch = 'x' + ch.toString(16);
      }
      out += '&#' + ch + ';';
    }

    return out;
  }
};

const { defaults: defaults$2 } = defaults;
const {
  cleanUrl: cleanUrl$1,
  escape: escape$2
} = helpers;

/**
 * Renderer
 */
var Renderer_1 = class Renderer {
  constructor(options) {
    this.options = options || defaults$2;
  }

  code(code, infostring, escaped) {
    const lang = (infostring || '').match(/\S*/)[0];
    if (this.options.highlight) {
      const out = this.options.highlight(code, lang);
      if (out != null && out !== code) {
        escaped = true;
        code = out;
      }
    }

    if (!lang) {
      return '<pre><code>'
        + (escaped ? code : escape$2(code, true))
        + '</code></pre>';
    }

    return '<pre><code class="'
      + this.options.langPrefix
      + escape$2(lang, true)
      + '">'
      + (escaped ? code : escape$2(code, true))
      + '</code></pre>\n';
  }

  blockquote(quote) {
    return '<blockquote>\n' + quote + '</blockquote>\n';
  }

  html(html) {
    return html;
  }

  heading(text, level, raw, slugger) {
    if (this.options.headerIds) {
      return '<h'
        + level
        + ' id="'
        + this.options.headerPrefix
        + slugger.slug(raw)
        + '">'
        + text
        + '</h'
        + level
        + '>\n';
    }
    // ignore IDs
    return '<h' + level + '>' + text + '</h' + level + '>\n';
  }

  hr() {
    return this.options.xhtml ? '<hr/>\n' : '<hr>\n';
  }

  list(body, ordered, start) {
    const type = ordered ? 'ol' : 'ul',
      startatt = (ordered && start !== 1) ? (' start="' + start + '"') : '';
    return '<' + type + startatt + '>\n' + body + '</' + type + '>\n';
  }

  listitem(text) {
    return '<li>' + text + '</li>\n';
  }

  checkbox(checked) {
    return '<input '
      + (checked ? 'checked="" ' : '')
      + 'disabled="" type="checkbox"'
      + (this.options.xhtml ? ' /' : '')
      + '> ';
  }

  paragraph(text) {
    return '<p>' + text + '</p>\n';
  }

  table(header, body) {
    if (body) body = '<tbody>' + body + '</tbody>';

    return '<table>\n'
      + '<thead>\n'
      + header
      + '</thead>\n'
      + body
      + '</table>\n';
  }

  tablerow(content) {
    return '<tr>\n' + content + '</tr>\n';
  }

  tablecell(content, flags) {
    const type = flags.header ? 'th' : 'td';
    const tag = flags.align
      ? '<' + type + ' align="' + flags.align + '">'
      : '<' + type + '>';
    return tag + content + '</' + type + '>\n';
  }

  // span level renderer
  strong(text) {
    return '<strong>' + text + '</strong>';
  }

  em(text) {
    return '<em>' + text + '</em>';
  }

  codespan(text) {
    return '<code>' + text + '</code>';
  }

  br() {
    return this.options.xhtml ? '<br/>' : '<br>';
  }

  del(text) {
    return '<del>' + text + '</del>';
  }

  link(href, title, text) {
    href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
    if (href === null) {
      return text;
    }
    let out = '<a href="' + escape$2(href) + '"';
    if (title) {
      out += ' title="' + title + '"';
    }
    out += '>' + text + '</a>';
    return out;
  }

  image(href, title, text) {
    href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
    if (href === null) {
      return text;
    }

    let out = '<img src="' + href + '" alt="' + text + '"';
    if (title) {
      out += ' title="' + title + '"';
    }
    out += this.options.xhtml ? '/>' : '>';
    return out;
  }

  text(text) {
    return text;
  }
};

/**
 * TextRenderer
 * returns only the textual part of the token
 */
var TextRenderer_1 = class TextRenderer {
  // no need for block level renderers
  strong(text) {
    return text;
  }

  em(text) {
    return text;
  }

  codespan(text) {
    return text;
  }

  del(text) {
    return text;
  }

  html(text) {
    return text;
  }

  text(text) {
    return text;
  }

  link(href, title, text) {
    return '' + text;
  }

  image(href, title, text) {
    return '' + text;
  }

  br() {
    return '';
  }
};

/**
 * Slugger generates header id
 */
var Slugger_1 = class Slugger {
  constructor() {
    this.seen = {};
  }

  /**
   * Convert string to unique id
   */
  slug(value) {
    let slug = value
      .toLowerCase()
      .trim()
      // remove html tags
      .replace(/<[!\/a-z].*?>/ig, '')
      // remove unwanted chars
      .replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g, '')
      .replace(/\s/g, '-');

    if (this.seen.hasOwnProperty(slug)) {
      const originalSlug = slug;
      do {
        this.seen[originalSlug]++;
        slug = originalSlug + '-' + this.seen[originalSlug];
      } while (this.seen.hasOwnProperty(slug));
    }
    this.seen[slug] = 0;

    return slug;
  }
};

const { defaults: defaults$3 } = defaults;
const {
  unescape: unescape$1
} = helpers;

/**
 * Parsing & Compiling
 */
var Parser_1 = class Parser {
  constructor(options) {
    this.options = options || defaults$3;
    this.options.renderer = this.options.renderer || new Renderer_1();
    this.renderer = this.options.renderer;
    this.renderer.options = this.options;
    this.textRenderer = new TextRenderer_1();
    this.slugger = new Slugger_1();
  }

  /**
   * Static Parse Method
   */
  static parse(tokens, options) {
    const parser = new Parser(options);
    return parser.parse(tokens);
  }

  /**
   * Parse Loop
   */
  parse(tokens, top = true) {
    let out = '',
      i,
      j,
      k,
      l2,
      l3,
      row,
      cell,
      header,
      body,
      token,
      ordered,
      start,
      loose,
      itemBody,
      item,
      checked,
      task,
      checkbox;

    const l = tokens.length;
    for (i = 0; i < l; i++) {
      token = tokens[i];
      switch (token.type) {
        case 'space': {
          continue;
        }
        case 'hr': {
          out += this.renderer.hr();
          continue;
        }
        case 'heading': {
          out += this.renderer.heading(
            this.parseInline(token.tokens),
            token.depth,
            unescape$1(this.parseInline(token.tokens, this.textRenderer)),
            this.slugger);
          continue;
        }
        case 'code': {
          out += this.renderer.code(token.text,
            token.lang,
            token.escaped);
          continue;
        }
        case 'table': {
          header = '';

          // header
          cell = '';
          l2 = token.header.length;
          for (j = 0; j < l2; j++) {
            cell += this.renderer.tablecell(
              this.parseInline(token.tokens.header[j]),
              { header: true, align: token.align[j] }
            );
          }
          header += this.renderer.tablerow(cell);

          body = '';
          l2 = token.cells.length;
          for (j = 0; j < l2; j++) {
            row = token.tokens.cells[j];

            cell = '';
            l3 = row.length;
            for (k = 0; k < l3; k++) {
              cell += this.renderer.tablecell(
                this.parseInline(row[k]),
                { header: false, align: token.align[k] }
              );
            }

            body += this.renderer.tablerow(cell);
          }
          out += this.renderer.table(header, body);
          continue;
        }
        case 'blockquote': {
          body = this.parse(token.tokens);
          out += this.renderer.blockquote(body);
          continue;
        }
        case 'list': {
          ordered = token.ordered;
          start = token.start;
          loose = token.loose;
          l2 = token.items.length;

          body = '';
          for (j = 0; j < l2; j++) {
            item = token.items[j];
            checked = item.checked;
            task = item.task;

            itemBody = '';
            if (item.task) {
              checkbox = this.renderer.checkbox(checked);
              if (loose) {
                if (item.tokens[0].type === 'text') {
                  item.tokens[0].text = checkbox + ' ' + item.tokens[0].text;
                  if (item.tokens[0].tokens && item.tokens[0].tokens.length > 0 && item.tokens[0].tokens[0].type === 'text') {
                    item.tokens[0].tokens[0].text = checkbox + ' ' + item.tokens[0].tokens[0].text;
                  }
                } else {
                  item.tokens.unshift({
                    type: 'text',
                    text: checkbox
                  });
                }
              } else {
                itemBody += checkbox;
              }
            }

            itemBody += this.parse(item.tokens, loose);
            body += this.renderer.listitem(itemBody, task, checked);
          }

          out += this.renderer.list(body, ordered, start);
          continue;
        }
        case 'html': {
          // TODO parse inline content if parameter markdown=1
          out += this.renderer.html(token.text);
          continue;
        }
        case 'paragraph': {
          out += this.renderer.paragraph(this.parseInline(token.tokens));
          continue;
        }
        case 'text': {
          body = token.tokens ? this.parseInline(token.tokens) : token.text;
          while (i + 1 < l && tokens[i + 1].type === 'text') {
            token = tokens[++i];
            body += '\n' + (token.tokens ? this.parseInline(token.tokens) : token.text);
          }
          out += top ? this.renderer.paragraph(body) : body;
          continue;
        }
        default: {
          const errMsg = 'Token with "' + token.type + '" type was not found.';
          if (this.options.silent) {
            console.error(errMsg);
            return;
          } else {
            throw new Error(errMsg);
          }
        }
      }
    }

    return out;
  }

  /**
   * Parse Inline Tokens
   */
  parseInline(tokens, renderer) {
    renderer = renderer || this.renderer;
    let out = '',
      i,
      token;

    const l = tokens.length;
    for (i = 0; i < l; i++) {
      token = tokens[i];
      switch (token.type) {
        case 'escape': {
          out += renderer.text(token.text);
          break;
        }
        case 'html': {
          out += renderer.html(token.text);
          break;
        }
        case 'link': {
          out += renderer.link(token.href, token.title, this.parseInline(token.tokens, renderer));
          break;
        }
        case 'image': {
          out += renderer.image(token.href, token.title, token.text);
          break;
        }
        case 'strong': {
          out += renderer.strong(this.parseInline(token.tokens, renderer));
          break;
        }
        case 'em': {
          out += renderer.em(this.parseInline(token.tokens, renderer));
          break;
        }
        case 'codespan': {
          out += renderer.codespan(token.text);
          break;
        }
        case 'br': {
          out += renderer.br();
          break;
        }
        case 'del': {
          out += renderer.del(this.parseInline(token.tokens, renderer));
          break;
        }
        case 'text': {
          out += renderer.text(token.text);
          break;
        }
        default: {
          const errMsg = 'Token with "' + token.type + '" type was not found.';
          if (this.options.silent) {
            console.error(errMsg);
            return;
          } else {
            throw new Error(errMsg);
          }
        }
      }
    }
    return out;
  }
};

const {
  merge: merge$2,
  checkSanitizeDeprecation: checkSanitizeDeprecation$1,
  escape: escape$3
} = helpers;
const {
  getDefaults,
  changeDefaults,
  defaults: defaults$4
} = defaults;

/**
 * Marked
 */
function marked(src, opt, callback) {
  // throw error in case of non string input
  if (typeof src === 'undefined' || src === null) {
    throw new Error('marked(): input parameter is undefined or null');
  }
  if (typeof src !== 'string') {
    throw new Error('marked(): input parameter is of type '
      + Object.prototype.toString.call(src) + ', string expected');
  }

  if (callback || typeof opt === 'function') {
    if (!callback) {
      callback = opt;
      opt = null;
    }

    opt = merge$2({}, marked.defaults, opt || {});
    checkSanitizeDeprecation$1(opt);
    const highlight = opt.highlight;
    let tokens,
      pending,
      i = 0;

    try {
      tokens = Lexer_1.lex(src, opt);
    } catch (e) {
      return callback(e);
    }

    pending = tokens.length;

    const done = function(err) {
      if (err) {
        opt.highlight = highlight;
        return callback(err);
      }

      let out;

      try {
        out = Parser_1.parse(tokens, opt);
      } catch (e) {
        err = e;
      }

      opt.highlight = highlight;

      return err
        ? callback(err)
        : callback(null, out);
    };

    if (!highlight || highlight.length < 3) {
      return done();
    }

    delete opt.highlight;

    if (!pending) return done();

    for (; i < tokens.length; i++) {
      (function(token) {
        if (token.type !== 'code') {
          return --pending || done();
        }
        return highlight(token.text, token.lang, function(err, code) {
          if (err) return done(err);
          if (code == null || code === token.text) {
            return --pending || done();
          }
          token.text = code;
          token.escaped = true;
          --pending || done();
        });
      })(tokens[i]);
    }

    return;
  }
  try {
    opt = merge$2({}, marked.defaults, opt || {});
    checkSanitizeDeprecation$1(opt);
    return Parser_1.parse(Lexer_1.lex(src, opt), opt);
  } catch (e) {
    e.message += '\nPlease report this to https://github.com/markedjs/marked.';
    if ((opt || marked.defaults).silent) {
      return '<p>An error occurred:</p><pre>'
        + escape$3(e.message + '', true)
        + '</pre>';
    }
    throw e;
  }
}

/**
 * Options
 */

marked.options =
marked.setOptions = function(opt) {
  merge$2(marked.defaults, opt);
  changeDefaults(marked.defaults);
  return marked;
};

marked.getDefaults = getDefaults;

marked.defaults = defaults$4;

/**
 * Expose
 */

marked.Parser = Parser_1;
marked.parser = Parser_1.parse;

marked.Renderer = Renderer_1;
marked.TextRenderer = TextRenderer_1;

marked.Lexer = Lexer_1;
marked.lexer = Lexer_1.lex;

marked.Slugger = Slugger_1;

marked.parse = marked;

var marked_1 = marked;

export default marked_1;