zulip/static/third/marked/lib/marked.js

/**
 * marked - a markdown parser
 * Copyright (c) 2011-2014, Christopher Jeffrey. (MIT Licensed)
 * https://github.com/chjj/marked
 */

;(function() {

/**
 * Block-Level Grammar
 */

var block = {
  newline: /^\n+/,
  code: /^( {4}[^\n]+\n*)+/,
  fences: noop,
  hr: /^( *[-*_]){3,} *(?:\n+|$)/,
  heading: /^ {0,3}(#{1,6}) +([^\n]*?)(?: +#+)? *(?:\n+|$)/,
  nptable: noop,
  blockquote: /^(?!( *>\s*($|\n))*($|\n))( *>[^\n]*(\n(?!def)[^\n]+)*)+/,
  list: /^( *)(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
  html: /^ *(?:comment *(?:\n|\s*$)|closed *(?:\n{2,}|\s*$)|closing *(?:\n{2,}|\s*$))/,
  def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
  table: noop,
  paragraph: /^((?:[^\n]+\n?(?!hr|heading|blockquote|tag|def))+)\n*/,
  text: /^[^\n]+/
};

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

block.list = replace(block.list)
  (/bull/g, block.bullet)
  ('hr', '\\n+(?=\\1?(?:[-*_] *){3,}(?:\\n+|$))')
  ('def', '\\n+(?=' + block.def.source + ')')
  ();

block.blockquote = replace(block.blockquote)
  ('def', block.def)
  ();

block._tag = '(?!(?:'
  + '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';

block.html = replace(block.html)
  ('comment', /<!--[\s\S]*?-->/)
  ('closed', /<(tag)[\s\S]+?<\/\1>/)
  ('closing', /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)
  (/tag/g, block._tag)
  ();

block.paragraph = replace(block.paragraph)
  ('hr', block.hr)
  ('heading', ' {0,3}#{1,6} +')
  ('blockquote', block.blockquote)
  ('tag', '<' + block._tag)
  ('def', block.def)
  ();

/**
 * Normal Block Grammar
 */

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

/**
 * GFM Block Grammar
 */

block.gfm = merge({}, block.normal, {
  fences: /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]*?)\s*\1 *(?:\n+|$)/,
  paragraph: /^/,
});

block.gfm.paragraph = replace(block.paragraph)
  ('(?!', '(?!'
    + block.gfm.fences.source.replace('\\1', '\\2') + '|'
    + block.list.source.replace('\\1', '\\3') + '|')
  ();

/**
 * GFM + Tables Block Grammar
 */

block.tables = merge({}, block.gfm, {
  nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
  table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
});

/**
 * Block Lexer
 */

function Lexer(options) {
  this.tokens = [];
  this.tokens.links = {};
  this.options = options || marked.defaults;
  this.rules = block.normal;

  if (this.options.gfm) {
    if (this.options.tables) {
      this.rules = block.tables;
    } else {
      this.rules = block.gfm;
    }
  }
}

/**
 * Expose Block Rules
 */

Lexer.rules = block;

/**
 * Static Lex Method
 */

Lexer.lex = function(src, options) {
  var lexer = new Lexer(options);
  return lexer.lex(src);
};

/**
 * Preprocessing
 */

Lexer.prototype.lex = function(src) {
  src = src
    .replace(/\r\n|\r/g, '\n')
    .replace(/\t/g, '    ')
    .replace(/\u00a0/g, ' ')
    .replace(/\u2424/g, '\n');

  return this.token(src, true);
};

var htmlStashCounter = 0;
var htmlStashTemplate = "klzzwxhzsd:";
var htmlStashRegex = /\bklzzwxhzsd:[0-9]+\b/;
var htmlStash = [];

function stashHtml(html, safe) {
  var key = htmlStashTemplate + htmlStashCounter;
  htmlStashCounter++;

  htmlStash.push([key, html, safe]);

  return key;
}

/**
 * Lexing
 */

Lexer.prototype.token = function(src, top, bq) {
  var src = src.replace(/^ +$/gm, '')
    , next
    , loose
    , cap
    , bull
    , b
    , item
    , listStart
    , listItems
    , space
    , i
    , l
    , isordered;

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

    // code
    if (cap = this.rules.code.exec(src)) {
      src = src.substring(cap[0].length);
      cap = cap[0].replace(/^ {4}/gm, '');
      this.tokens.push({
        type: 'code',
        text: !this.options.pedantic
          ? cap.replace(/\n+$/, '')
          : cap
      });
      continue;
    }

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

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

    // table no leading pipe (gfm)
    if (top && (cap = this.rules.nptable.exec(src))) {
      src = src.substring(cap[0].length);

      item = {
        type: 'table',
        header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
        align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
        cells: cap[3].replace(/\n$/, '').split('\n')
      };

      for (i = 0; i < item.align.length; 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;
        }
      }

      for (i = 0; i < item.cells.length; i++) {
        item.cells[i] = item.cells[i].split(/ *\| */);
      }

      this.tokens.push(item);

      continue;
    }

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

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

      this.tokens.push({
        type: 'blockquote_start'
      });

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

      // Pass `top` to keep the current
      // "toplevel" state. This is exactly
      // how markdown.pl works.
      this.token(cap, top, true);

      this.tokens.push({
        type: 'blockquote_end'
      });

      continue;
    }

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

      listStart = {
        type: 'list_start',
        ordered: isordered,
        start: isordered ? +bull : '',
        loose: false
      };

      this.tokens.push(listStart);

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

      listItems = [];
      next = false;
      l = cap.length;
      i = 0;

      for (; i < l; i++) {
        item = cap[i];

        // 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.bullet.exec(cap[i + 1])[0];
          if (bull.length > 1 ? b.length === 1
            : (b.length > 1 || (this.options.smartLists && b !== bull))) {
            src = cap.slice(i + 1).join('\n') + src;
            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) {
          listStart.loose = true;
        }

        var t = {
          type: 'list_item_start',
          loose: loose
        };

        listItems.push(t);
        this.tokens.push(t);

        // Recurse.
        this.token(item, false);

        this.tokens.push({
          type: 'list_item_end'
        });
      }

      if (listStart.loose) {
        l = listItems.length;
        i = 0;
        for (; i < l; i++) {
          listItems[i].loose = true;
        }
      }

      this.tokens.push({
        type: 'list_end'
      });

      continue;
    }

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

    // def
    // We disable definition style links in Zulip.

    // table (gfm)
    if (top && (cap = this.rules.table.exec(src))) {
      src = src.substring(cap[0].length);

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

      for (i = 0; i < item.align.length; 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;
        }
      }

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

      this.tokens.push(item);

      continue;
    }

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

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

    if (src) {
      throw new
        Error('Infinite loop on byte: ' + src.charCodeAt(0));
    }
  }

  return this.tokens;
};

/**
 * Inline-Level Grammar
 */

var inline = {
  escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
  autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
  url: noop,
  tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
  link: /^!?\[(inside)\]\(href\)/,
  reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
  nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
  strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
  em: /^\b_((?:[^_]|__)+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
  code: /^(`+)(\s*[\s\S]*?[^`]\s*)\1(?!`)/,
  br: /^ {2,}\n(?!\s*$)/,
  del: noop,
  emoji: noop,
  unicodeemoji: noop,
  usermention: noop,
  groupmention: noop,
  stream: noop,
  tex: noop,
  timestamp: noop,
  linkifiers: [],
  text: /^[\s\S]+?(?=[\\<!\[_*`$]| {2,}\n|$)/
};

inline._inside = /(?:\[[^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*/;
inline._href = /\s*<?([\s\S]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;

inline.link = replace(inline.link)
  ('inside', inline._inside)
  ('href', inline._href)
  ();

inline.reflink = replace(inline.reflink)
  ('inside', inline._inside)
  ();

/**
 * Normal Inline Grammar
 */

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

/**
 * Pedantic Inline Grammar
 */

inline.pedantic = merge({}, inline.normal, {
  strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
  em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
});

/**
 * GFM Inline Grammar
 */

inline.gfm = merge({}, inline.normal, {
  escape: replace(inline.escape)('])', '~|])')(),
  url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
  del: /^~~(?=\S)([\s\S]*?\S)~~/,
  text: replace(inline.text)
    (']|', '~]|')
    ('|', '|https?://|')
    ()
});

/**
 * GFM + Line Breaks Inline Grammar
 */

inline.breaks = merge({}, inline.gfm, {
  br: replace(inline.br)('{2,}', '*')(),
  text: replace(inline.gfm.text)('{2,}', '*')()
});

inline.zulip = merge({}, inline.breaks, {
  emoji: /^:([A-Za-z0-9_\-\+]+?):/,
  unicodeemoji: RegExp('^(\ud83c[\udd00-\udfff]|\ud83d[\udc00-\ude4f]|' +
                       '\ud83d[\ude80-\udeff]|\ud83e[\udd00-\uddff]|' +
                       '[\u2000-\u206F]|[\u2300-\u27BF]|[\u2B00-\u2BFF]|' +
                       '[\u3000-\u303F]|[\u3200-\u32FF])'),
  usermention: /^(@(_?)(?:\*\*([^\*]+)\*\*))/, // Match potentially multi-word string between @** **
  groupmention: /^@\*([^\*]+)\*/, // Match multi-word string between @* *
  stream_topic: /^#\*\*([^\*>]+)>([^\*]+)\*\*/,
  stream: /^#\*\*([^\*]+)\*\*/,
  tex: /^(\$\$([^\n_$](\\\$|[^\n$])*)\$\$(?!\$))\B/,
  timestamp: /^<time:([^>]+)>/,
  linkifiers: [],
  text: replace(inline.breaks.text)
    ('|', '|(\ud83c[\udd00-\udfff]|\ud83d[\udc00-\ude4f]|' +
          '\ud83d[\ude80-\udeff]|\ud83e[\udd00-\uddff]|' +
          '[\u2000-\u206F]|[\u2300-\u27BF]|[\u2B00-\u2BFF]|' +
          '[\u3000-\u303F]|[\u3200-\u32FF])|')
    (']|', '#@:]|')
    ('^[', '^^\\${3,}|^^[')
    ()
});

function shorten_links(href) {
  // This value must match what is used in the backend.
  const COMMIT_ID_PREFIX_LENGTH = 12;
  const url = new URL(href);
  if (url.protocol === 'https:' && ['github.com'].includes(url.hostname)) {
    // The following part of the code was necessary because unlike Python, str.split
    // method in javascript does not return the remaining part of the string.
    var parts = url.pathname.split('/').slice(1);
    parts = parts.slice(0, 4)
      .concat(parts.slice(4).join('/'))
      .concat(Array(5).fill(''))
      .slice(0, 5);

    const organisation = parts[0]
      , repository = parts[1]
      , artifact = parts[2]
      , value = parts[3]
      , remaining_path = parts[4];

    if (!organisation || !repository || !artifact || !value) {
      return href;
    }

    const repo_short_text = organisation + '/' + repository;

    if (remaining_path || url.hash) {
      return href;
    }

    if (url.hostname === 'github.com') {
      return shorten_github_links(href, artifact, repo_short_text,
                                  value, COMMIT_ID_PREFIX_LENGTH);
    }
  }
  return href;
}

/**
 * Shorten GitHub Links
 */

function shorten_github_links(href, artifact, repo_short_text,
                              value, commit_id_prefix_length) {
  if (['pull', 'issues'].includes(artifact)) {
    return repo_short_text + '#' + value;
  }
  if (artifact == 'commit') {
    return repo_short_text + '@' + value.slice(0, commit_id_prefix_length);
  }
  return href;
}

/**
 * Inline Lexer & Compiler
 */

function InlineLexer(links, options) {
  this.options = options || marked.defaults;
  this.links = links;
  this.rules = inline.normal;
  this.renderer = this.options.renderer || new Renderer;
  this.renderer.options = this.options;

  if (!this.links) {
    throw new
      Error('Tokens array requires a `links` property.');
  }

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

/**
 * Expose Inline Rules
 */

InlineLexer.rules = inline;

/**
 * Static Lexing/Compiling Method
 */

InlineLexer.output = function(src, links, options) {
  var inline = new InlineLexer(links, options);
  return inline.output(src);
};

/**
 * Lexing/Compiling
 */

InlineLexer.prototype.inlineReplacement = function(regex, src, replace_func) {
  var cap, out = "";
  regex.lastIndex = 0;
  if (cap = regex.exec(src)) {
    // Split before-match into its own segment and handle it separately
    var match_idx = regex.lastIndex;
    var before = src.substring(0, match_idx - cap[0].length);
    before = this.output(before);
    out += before;

    // Consume all of the matched text
    src = src.substring(match_idx);

    out += replace_func(regex, cap.slice(1), cap[0]);
  }

  return [src, out];
};

InlineLexer.prototype.output = function(src) {
  var out = ''
    , link
    , text
    , href
    , cap;

  while (src) {
    // escape
    if (cap = this.rules.escape.exec(src)) {
      src = src.substring(cap[0].length);
      out += cap[1];
      continue;
    }

    // linkifier (Zulip)
    var self = this;
    this.rules.linkifiers.forEach(function (linkifier) {
      var ret = self.inlineReplacement(linkifier, src, function(regex, groups, match) {
        // Insert the created URL
        href = self.linkifier(regex, groups, match);
        if (href !== undefined) {
          href = escape(href);
          return self.renderer.link(href, href, match);
        } else {
          return match;
        }
      });

      src = ret[0];
      out += ret[1];
    });

    // autolink
    if (cap = this.rules.autolink.exec(src)) {
      src = src.substring(cap[0].length);
      if (cap[2] === '@') {
        text = cap[1].charAt(6) === ':'
          ? this.mangle(cap[1].substring(7))
          : this.mangle(cap[1]);
        href = this.mangle('mailto:') + text;
      } else {
        text = escape(cap[1]);
        href = text;
      }
      out += this.renderer.link(href, null, text);
      continue;
    }

    // url (gfm)
    if (!this.inLink && (cap = this.rules.url.exec(src))) {
      src = src.substring(cap[0].length);
      href = escape(cap[1]);
      text = shorten_links(href)
      out += this.renderer.link(href, null, text);
      continue;
    }

    // timestamp
    if (cap = this.rules.timestamp.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.timestamp(cap[1]);
      continue;
    }

    // tag
    if (cap = this.rules.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;
      }
      src = src.substring(cap[0].length);
      out += this.options.sanitize
        ? this.options.sanitizer
          ? this.options.sanitizer(cap[0])
          : escape(cap[0])
        : cap[0]
      continue;
    }

    // link
    if (cap = this.rules.link.exec(src)) {
      src = src.substring(cap[0].length);
      this.inLink = true;
      out += this.outputLink(cap, {
        href: cap[2],
        title: cap[3]
      });
      this.inLink = false;
      continue;
    }

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

    // usermention (Zulip)
    if (cap = this.rules.usermention.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.usermention(unescape(cap[3] || cap[4]), cap[1], cap[2]);
      continue;
    }

    // groupmention (Zulip)
    if (cap = this.rules.groupmention.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.groupmention(unescape(cap[1]), cap[0]);
      continue;
    }

    // stream_topic (Zulip)
    if (cap = this.rules.stream_topic.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.stream_topic(unescape(cap[1]), unescape(cap[2]), cap[0]);
      continue;
    }

    // stream (Zulip)
    if (cap = this.rules.stream.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.stream(unescape(cap[1]), cap[0]);
      continue;
    }

    // strong
    if (cap = this.rules.strong.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.strong(this.output(cap[2] || cap[1]));
      continue;
    }

    // em
    if (cap = this.rules.em.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.em(this.output(cap[1] + cap[2]));
      continue;
    }

    // code
    if (cap = this.rules.code.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.codespan(escape(cap[2], true));
      continue;
    }

    // br
    if (cap = this.rules.br.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.br();
      continue;
    }

    // del (gfm)
    if (cap = this.rules.del.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.del(this.output(cap[1]));
      continue;
    }

    // emoji (gfm)
    if (cap = this.rules.emoji.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.emoji(cap[1]);
      continue;
    }

    // Unicode emoji
    if (cap = this.rules.unicodeemoji.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.unicodeEmoji(cap[1]);
      continue;
    }

    // timestamp
    if (cap = this.rules.timestamp.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.timestamp(cap[1]);
      continue;
    }

    // tex
    if (cap = this.rules.tex.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.tex(cap[2], cap[0]);
      continue;
    }

    // WARNING: Do not place any parsing logic below this comment.
    // Any parsing logic place after the `text` block below will most
    // likely be silently never executed.

    // text
    if (cap = this.rules.text.exec(src)) {
      src = src.substring(cap[0].length);
      out += this.renderer.text(escape(this.smartypants(cap[0])));
      continue;
    }

    if (src) {
      throw new
        Error('Infinite loop on byte: ' + src.charCodeAt(0));
    }
  }

  return out;
};

/**
 * Compile Link
 */

InlineLexer.prototype.outputLink = function(cap, link) {
  var href = escape(link.href)
    , title = link.title ? escape(link.title) : null;

  return cap[0].charAt(0) !== '!'
    ? this.renderer.link(href, title, this.output(cap[1]))
    : this.renderer.image(href, title, escape(cap[1]));
};
InlineLexer.prototype.emoji = function (name) {
  name = escape(name)
  if (typeof this.options.emojiHandler !== 'function')
    return ':' + name + ':';

  return this.options.emojiHandler(name);
};

InlineLexer.prototype.unicodeEmoji = function (name) {
  name = escape(name)
  if (typeof this.options.unicodeEmojiHandler !== 'function')
    return name;
  return this.options.unicodeEmojiHandler(name);
};

InlineLexer.prototype.tex = function (tex, fullmatch) {
  if (typeof this.options.texHandler !== 'function')
    return fullmatch;
  return this.options.texHandler(tex, fullmatch);
};

InlineLexer.prototype.timestamp = function (time) {
  if (typeof this.options.timestampHandler !== 'function')
    return '&lt;time:' + time + '&gt;';
  return this.options.timestampHandler(time);
};

InlineLexer.prototype.linkifier = function (linkifier, matches, orig) {
  if (typeof this.options.linkifierHandler !== 'function')
    return;

  return this.options.linkifierHandler(linkifier, matches);
};

InlineLexer.prototype.usermention = function (username, orig, silent) {
  orig = escape(orig);
  if (typeof this.options.userMentionHandler !== 'function')
  {
    return orig;
  }
  var handled = this.options.userMentionHandler(username, silent === '_');
  if (handled !== undefined) {
    return handled;
  }

  return orig;
};

InlineLexer.prototype.groupmention = function (groupname, orig) {
  orig = escape(orig);
  if (typeof this.options.groupMentionHandler !== 'function')
  {
    return orig;
  }

  var handled = this.options.groupMentionHandler(groupname);
  if (handled !== undefined) {
    return handled;
  }

  return orig;
};

InlineLexer.prototype.stream = function (streamName, orig) {
  orig = escape(orig);
  if (typeof this.options.streamHandler !== 'function')
    return orig;

  var handled = this.options.streamHandler(streamName);
  if (handled !== undefined) {
    return handled;
  }
  return orig;
};

InlineLexer.prototype.stream_topic = function (streamName, topic, orig) {
  orig = escape(orig);
  if (typeof this.options.streamHandler !== 'function')
    return orig;

  var handled = this.options.streamTopicHandler(streamName, topic);
  if (handled !== undefined) {
    return handled;
  }
  return orig;
};

/**
 * Smartypants Transformations
 */

InlineLexer.prototype.smartypants = function(text) {
  if (!this.options.smartypants) return 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
 */

InlineLexer.prototype.mangle = function(text) {
  if (!this.options.mangle) return text;
  var out = ''
    , l = text.length
    , i = 0
    , ch;

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

  return out;
};

/**
 * Renderer
 */

function Renderer(options) {
  this.options = options || {};
}

Renderer.prototype.code = function(code, lang, escaped) {
  if (this.options.highlight) {
    var out = this.options.highlight(code, lang);
    if (out != null && out !== code) {
      escaped = true;
      code = out;
    }
  }

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

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

Renderer.prototype.blockquote = function(quote) {
  quote = this.options.silencedMentionHandler(quote);
  return '<blockquote>\n' + quote + '</blockquote>\n';
};

Renderer.prototype.html = function(html) {
  return html;
};

Renderer.prototype.heading = function(text, level, raw, slugger) {
  // ignore IDs
  return '<h' + level + '>' + text + '</h' + level + '>\n';
};

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

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

Renderer.prototype.listitem = function(text) {
  return '<li>' + text + '</li>\n';
};

Renderer.prototype.paragraph = function(text) {
  return '<p>' + text + '</p>\n';
};

Renderer.prototype.table = function(header, body) {
  return '<table>\n'
    + '<thead>\n'
    + header
    + '</thead>\n'
    + '<tbody>\n'
    + body
    + '</tbody>\n'
    + '</table>\n';
};

Renderer.prototype.tablerow = function(content) {
  return '<tr>\n' + content + '</tr>\n';
};

Renderer.prototype.tablecell = function(content, flags) {
  var type = flags.header ? 'th' : 'td';
  var tag = flags.align
    ? '<' + type + ' style="text-align:' + flags.align + '">'
    : '<' + type + '>';
  return tag + content + '</' + type + '>\n';
};

// span level renderer
Renderer.prototype.strong = function(text) {
  return '<strong>' + text + '</strong>';
};

Renderer.prototype.em = function(text) {
  return '<em>' + text + '</em>';
};

Renderer.prototype.codespan = function(text) {
  return '<code>' + text + '</code>';
};

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

Renderer.prototype.del = function(text) {
  return '<del>' + text + '</del>';
};

Renderer.prototype.link = function(href, title, text) {
  if (this.options.sanitize) {
    try {
      var prot = decodeURIComponent(unescape(href))
        .replace(/[^\w:]/g, '')
        .toLowerCase();
    } catch (e) {
      return '';
    }
    if (prot.startsWith('javascript:') || prot.startsWith('vbscript:')) {
      return '';
    }
  }
  var out = '<a href="' + href + '"';
  if (title) {
    out += ' title="' + title + '"';
  }
  out += '>' + text + '</a>';
  return out;
};

Renderer.prototype.image = function(href, title, text) {
  var out = '<img src="' + href + '" alt="' + text + '"';
  if (title) {
    out += ' title="' + title + '"';
  }
  out += this.options.xhtml ? '/>' : '>';
  return out;
};

Renderer.prototype.text = function(text) {
  return text;
};

/**
 * Parsing & Compiling
 */

function Parser(options) {
  this.tokens = [];
  this.token = null;
  this.options = options || marked.defaults;
  this.options.renderer = this.options.renderer || new Renderer;
  this.renderer = this.options.renderer;
  this.renderer.options = this.options;
}

/**
 * Static Parse Method
 */

Parser.parse = function(src, options, renderer) {
  var parser = new Parser(options, renderer);
  var out = parser.parse(src);
  out = parser.postprocess(out);
  return out;
};

/**
 * Parse Loop
 */

Parser.prototype.parse = function(src) {
  this.inline = new InlineLexer(src.links, this.options, this.renderer);
  this.tokens = src.reverse();

  var out = '';
  while (this.next()) {
    out += this.tok();
  }

  return out;
};

/**
 * Post Processing - replace stashed HTML
 **/
 Parser.prototype.postprocess = function(output) {
  for (var i = 0; i < htmlStash.length; i++) {
    var stash = htmlStash[i];
    var key = stash[0],
        html = stash[1],
        safe = stash[2];
    if (!safe) {
      html = escape(html);
    }
    output = output.replace('<p>' + key + '</p>', html)
  }
  return output;
 };

/**
 * Next Token
 */

Parser.prototype.next = function() {
  return this.token = this.tokens.pop();
};

/**
 * Preview Next Token
 */

Parser.prototype.peek = function() {
  return this.tokens[this.tokens.length - 1] || 0;
};

/**
 * Parse Text Tokens
 */

Parser.prototype.parseText = function() {
  var body = this.token.text;

  while (this.peek().type === 'text') {
    body += '\n' + this.next().text;
  }

  return this.inline.output(body);
};

/**
 * Parse Current Token
 */

Parser.prototype.tok = function() {
  switch (this.token.type) {
    case 'space': {
      return '';
    }
    case 'heading': {
      return this.renderer.heading(
        this.inline.output(this.token.text),
        this.token.depth,
        unescape(this.token.text),
        this.slugger);
    }
    case 'hr': {
      return this.renderer.hr();
    }
    case 'code': {
      return this.renderer.code(this.token.text,
        this.token.lang,
        this.token.escaped);
    }
    case 'table': {
      var header = ''
        , body = ''
        , i
        , row
        , cell
        , flags
        , j;

      // header
      cell = '';
      for (i = 0; i < this.token.header.length; i++) {
        flags = { header: true, align: this.token.align[i] };
        cell += this.renderer.tablecell(
          this.inline.output(this.token.header[i]),
          { header: true, align: this.token.align[i] }
        );
      }
      header += this.renderer.tablerow(cell);

      for (i = 0; i < this.token.cells.length; i++) {
        row = this.token.cells[i];

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

        body += this.renderer.tablerow(cell);
      }
      return this.renderer.table(header, body);
    }
    case 'blockquote_start': {
      var body = '';

      while (this.next().type !== 'blockquote_end') {
        body += this.tok();
      }

      return this.renderer.blockquote(body);
    }
    case 'list_start': {
      var body = ''
        , ordered = this.token.ordered
        , start = this.token.start;

      while (this.next().type !== 'list_end') {
        body += this.tok();
      }

      return this.renderer.list(body, ordered, start);
    }
    case 'list_item_start': {
      var body = ''
        , loose = this.token.loose;

      while (this.next().type !== 'list_item_end') {
        body += !loose && this.token.type === 'text'
          ? this.parseText()
          : this.tok();
      }

      return this.renderer.listitem(body);
    }
    case 'html': {
      var html = !this.token.pre && !this.options.pedantic
        ? this.inline.output(this.token.text)
        : this.token.text;
      return this.renderer.html(html);
    }
    case 'paragraph': {
      return this.renderer.paragraph(this.inline.output(this.token.text));
    }
    case 'text': {
      return this.renderer.paragraph(this.parseText());
    }
  }
};

/**
 * Helpers
 */

function escape(html, encode) {
  return html
    .replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;');
}

var unescapeReplacements = {
  amp: '&',
  lt: '<',
  gt: '>',
  quot: '"',
  colon: ':',
};

function unescape(html) {
  // explicitly match decimal, hex, and named HTML entities
  return html.replace(/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:[0-9A-Za-z]+));?/g, function(_, n) {
    n = n.toLowerCase();
    if (n.charAt(0) === '#') {
      return n.charAt(1) === 'x'
        ? String.fromCharCode(parseInt(n.substring(2), 16))
        : String.fromCharCode(+n.substring(1));
    }
    return unescapeReplacements[n] || '';
  });
}

function replace(regex, opt) {
  regex = regex.source;
  opt = opt || '';
  return function self(name, val) {
    if (!name) return new RegExp(regex, opt);
    val = val.source || val;
    val = val.replace(/(^|[^\[])\^/g, '$1');
    regex = regex.replace(name, val);
    return self;
  };
}

function noop() {}
noop.exec = noop;

function merge(obj) {
  var 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;
}


/**
 * Marked
 */

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

    opt = merge({}, marked.defaults, opt || {});

    var highlight = opt.highlight
      , tokens
      , pending
      , i = 0;

    htmlStashCounter = 0;
    htmlStash = [];
    for (var k = 0; k < opt.preprocessors.length; k++) {
      src = opt.preprocessors[k](src);
    }

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

    pending = tokens.length;

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

      var out;

      try {
        out = Parser.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 {
    if (opt) opt = merge({}, marked.defaults, opt);
    htmlStashCounter = 0;
    htmlStash = [];
    for (var i = 0; i < marked.defaults.preprocessors.length; i++) {
      src = marked.defaults.preprocessors[i](src);
    }
    return Parser.parse(Lexer.lex(src, opt), opt);
  } catch (e) {
    e.message += '\nPlease report this to https://github.com/chjj/marked.';
    if ((opt || marked.defaults).silent) {
      return '<p>An error occurred:</p><pre>'
        + escape(e.message + '', true)
        + '</pre>';
    }
    throw e;
  }
}

/**
 * Options
 */

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

marked.defaults = {
  gfm: true,
  emoji: false,
  unicodeemoji: false,
  timestamp: true,
  tables: true,
  breaks: false,
  pedantic: false,
  sanitize: false,
  sanitizer: null,
  mangle: true,
  smartLists: false,
  silent: false,
  highlight: null,
  langPrefix: 'lang-',
  smartypants: false,
  headerPrefix: '',
  renderer: new Renderer,
  preprocessors: [],
  xhtml: false
};

/**
 * Expose
 */

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

marked.Renderer = Renderer;

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

marked.InlineLexer = InlineLexer;
marked.inlineLexer = InlineLexer.output;

marked.parse = marked;

marked.stashHtml = stashHtml;

if (typeof module !== 'undefined' && typeof exports === 'object') {
  module.exports = marked;
} else if (typeof define === 'function' && define.amd) {
  define(function() { return marked; });
} else {
  this.marked = marked;
}

}).call(function() {
  return this || (typeof window !== 'undefined' ? window : global);
}());