showdown.js

;/*! showdown 06-02-2017 */
(function(){
/**
 * Created by Tivie on 13-07-2015.
 */

function getDefaultOpts (simple) {
  'use strict';

  var defaultOptions = {
    omitExtraWLInCodeBlocks: {
      defaultValue: false,
      describe: 'Omit the default extra whiteline added to code blocks',
      type: 'boolean'
    },
    noHeaderId: {
      defaultValue: false,
      describe: 'Turn on/off generated header id',
      type: 'boolean'
    },
    prefixHeaderId: {
      defaultValue: false,
      describe: 'Specify a prefix to generated header ids',
      type: 'string'
    },
    ghCompatibleHeaderId: {
      defaultValue: false,
      describe: 'Generate header ids compatible with github style (spaces are replaced with dashes, a bunch of non alphanumeric chars are removed)',
      type: 'boolean'
    },
    headerLevelStart: {
      defaultValue: false,
      describe: 'The header blocks level start',
      type: 'integer'
    },
    parseImgDimensions: {
      defaultValue: false,
      describe: 'Turn on/off image dimension parsing',
      type: 'boolean'
    },
    simplifiedAutoLink: {
      defaultValue: false,
      describe: 'Turn on/off GFM autolink style',
      type: 'boolean'
    },
    excludeTrailingPunctuationFromURLs: {
      defaultValue: false,
      describe: 'Excludes trailing punctuation from links generated with autoLinking',
      type: 'boolean'
    },
    literalMidWordUnderscores: {
      defaultValue: false,
      describe: 'Parse midword underscores as literal underscores',
      type: 'boolean'
    },
    strikethrough: {
      defaultValue: false,
      describe: 'Turn on/off strikethrough support',
      type: 'boolean'
    },
    tables: {
      defaultValue: false,
      describe: 'Turn on/off tables support',
      type: 'boolean'
    },
    tablesHeaderId: {
      defaultValue: false,
      describe: 'Add an id to table headers',
      type: 'boolean'
    },
    ghCodeBlocks: {
      defaultValue: true,
      describe: 'Turn on/off GFM fenced code blocks support',
      type: 'boolean'
    },
    tasklists: {
      defaultValue: false,
      describe: 'Turn on/off GFM tasklist support',
      type: 'boolean'
    },
    smoothLivePreview: {
      defaultValue: false,
      describe: 'Prevents weird effects in live previews due to incomplete input',
      type: 'boolean'
    },
    smartIndentationFix: {
      defaultValue: false,
      description: 'Tries to smartly fix indentation in es6 strings',
      type: 'boolean'
    },
    disableForced4SpacesIndentedSublists: {
      defaultValue: false,
      description: 'Disables the requirement of indenting nested sublists by 4 spaces',
      type: 'boolean'
    },
    simpleLineBreaks: {
      defaultValue: false,
      description: 'Parses simple line breaks as <br> (GFM Style)',
      type: 'boolean'
    },
    requireSpaceBeforeHeadingText: {
      defaultValue: false,
      description: 'Makes adding a space between `#` and the header text mandatory (GFM Style)',
      type: 'boolean'
    },
    ghMentions: {
      defaultValue: false,
      description: 'Enables github @mentions',
      type: 'boolean'
    },
    ghMentionsLink: {
      defaultValue: 'https://github.com/{u}',
      description: 'Changes the link generated by @mentions. Only applies if ghMentions option is enabled.',
      type: 'string'
    },
    encodeEmails: {
      defaultValue: true,
      description: 'Encode e-mail addresses through the use of Character Entities, transforming ASCII e-mail addresses into its equivalent decimal entities',
      type: 'boolean'
    }
  };
  if (simple === false) {
    return JSON.parse(JSON.stringify(defaultOptions));
  }
  var ret = {};
  for (var opt in defaultOptions) {
    if (defaultOptions.hasOwnProperty(opt)) {
      ret[opt] = defaultOptions[opt].defaultValue;
    }
  }
  return ret;
}

function allOptionsOn () {
  'use strict';
  var options = getDefaultOpts(true),
      ret = {};
  for (var opt in options) {
    if (options.hasOwnProperty(opt)) {
      ret[opt] = true;
    }
  }
  return ret;
}

/**
 * Created by Tivie on 06-01-2015.
 */

// Private properties
var showdown = {},
    parsers = {},
    extensions = {},
    globalOptions = getDefaultOpts(true),
    setFlavor = 'vanilla',
    flavor = {
      github: {
        omitExtraWLInCodeBlocks:              true,
        simplifiedAutoLink:                   true,
        excludeTrailingPunctuationFromURLs:   true,
        literalMidWordUnderscores:            true,
        strikethrough:                        true,
        tables:                               true,
        tablesHeaderId:                       true,
        ghCodeBlocks:                         true,
        tasklists:                            true,
        disableForced4SpacesIndentedSublists: true,
        simpleLineBreaks:                     true,
        requireSpaceBeforeHeadingText:        true,
        ghCompatibleHeaderId:                 true,
        ghMentions:                           true
      },
      original: {
        noHeaderId:                           true,
        ghCodeBlocks:                         false
      },
      ghost: {
        omitExtraWLInCodeBlocks:              true,
        parseImgDimensions:                   true,
        simplifiedAutoLink:                   true,
        excludeTrailingPunctuationFromURLs:   true,
        literalMidWordUnderscores:            true,
        strikethrough:                        true,
        tables:                               true,
        tablesHeaderId:                       true,
        ghCodeBlocks:                         true,
        tasklists:                            true,
        smoothLivePreview:                    true,
        simpleLineBreaks:                     true,
        requireSpaceBeforeHeadingText:        true,
        ghMentions:                           false,
        encodeEmails:                         true
      },
      vanilla: getDefaultOpts(true),
      allOn: allOptionsOn()
    };

/**
 * helper namespace
 * @type {{}}
 */
showdown.helper = {};

/**
 * TODO LEGACY SUPPORT CODE
 * @type {{}}
 */
showdown.extensions = {};

/**
 * Set a global option
 * @static
 * @param {string} key
 * @param {*} value
 * @returns {showdown}
 */
showdown.setOption = function (key, value) {
  'use strict';
  globalOptions[key] = value;
  return this;
};

/**
 * Get a global option
 * @static
 * @param {string} key
 * @returns {*}
 */
showdown.getOption = function (key) {
  'use strict';
  return globalOptions[key];
};

/**
 * Get the global options
 * @static
 * @returns {{}}
 */
showdown.getOptions = function () {
  'use strict';
  return globalOptions;
};

/**
 * Reset global options to the default values
 * @static
 */
showdown.resetOptions = function () {
  'use strict';
  globalOptions = getDefaultOpts(true);
};

/**
 * Set the flavor showdown should use as default
 * @param {string} name
 */
showdown.setFlavor = function (name) {
  'use strict';
  if (!flavor.hasOwnProperty(name)) {
    throw Error(name + ' flavor was not found');
  }
  var preset = flavor[name];
  setFlavor = name;
  for (var option in preset) {
    if (preset.hasOwnProperty(option)) {
      globalOptions[option] = preset[option];
    }
  }
};

/**
 * Get the currently set flavor
 * @returns {string}
 */
showdown.getFlavor = function () {
  'use strict';
  return setFlavor;
};

/**
 * Get the options of a specified flavor. Returns undefined if the flavor was not found
 * @param {string} name Name of the flavor
 * @returns {{}|undefined}
 */
showdown.getFlavorOptions = function (name) {
  'use strict';
  if (flavor.hasOwnProperty(name)) {
    return flavor[name];
  }
};

/**
 * Get the default options
 * @static
 * @param {boolean} [simple=true]
 * @returns {{}}
 */
showdown.getDefaultOptions = function (simple) {
  'use strict';
  return getDefaultOpts(simple);
};

/**
 * Get or set a subParser
 *
 * subParser(name)       - Get a registered subParser
 * subParser(name, func) - Register a subParser
 * @static
 * @param {string} name
 * @param {function} [func]
 * @returns {*}
 */
showdown.subParser = function (name, func) {
  'use strict';
  if (showdown.helper.isString(name)) {
    if (typeof func !== 'undefined') {
      parsers[name] = func;
    } else {
      if (parsers.hasOwnProperty(name)) {
        return parsers[name];
      } else {
        throw Error('SubParser named ' + name + ' not registered!');
      }
    }
  }
};

/**
 * Gets or registers an extension
 * @static
 * @param {string} name
 * @param {object|function=} ext
 * @returns {*}
 */
showdown.extension = function (name, ext) {
  'use strict';

  if (!showdown.helper.isString(name)) {
    throw Error('Extension \'name\' must be a string');
  }

  name = showdown.helper.stdExtName(name);

  // Getter
  if (showdown.helper.isUndefined(ext)) {
    if (!extensions.hasOwnProperty(name)) {
      throw Error('Extension named ' + name + ' is not registered!');
    }
    return extensions[name];

    // Setter
  } else {
    // Expand extension if it's wrapped in a function
    if (typeof ext === 'function') {
      ext = ext();
    }

    // Ensure extension is an array
    if (!showdown.helper.isArray(ext)) {
      ext = [ext];
    }

    var validExtension = validate(ext, name);

    if (validExtension.valid) {
      extensions[name] = ext;
    } else {
      throw Error(validExtension.error);
    }
  }
};

/**
 * Gets all extensions registered
 * @returns {{}}
 */
showdown.getAllExtensions = function () {
  'use strict';
  return extensions;
};

/**
 * Remove an extension
 * @param {string} name
 */
showdown.removeExtension = function (name) {
  'use strict';
  delete extensions[name];
};

/**
 * Removes all extensions
 */
showdown.resetExtensions = function () {
  'use strict';
  extensions = {};
};

/**
 * Validate extension
 * @param {array} extension
 * @param {string} name
 * @returns {{valid: boolean, error: string}}
 */
function validate (extension, name) {
  'use strict';

  var errMsg = (name) ? 'Error in ' + name + ' extension->' : 'Error in unnamed extension',
      ret = {
        valid: true,
        error: ''
      };

  if (!showdown.helper.isArray(extension)) {
    extension = [extension];
  }

  for (var i = 0; i < extension.length; ++i) {
    var baseMsg = errMsg + ' sub-extension ' + i + ': ',
        ext = extension[i];
    if (typeof ext !== 'object') {
      ret.valid = false;
      ret.error = baseMsg + 'must be an object, but ' + typeof ext + ' given';
      return ret;
    }

    if (!showdown.helper.isString(ext.type)) {
      ret.valid = false;
      ret.error = baseMsg + 'property "type" must be a string, but ' + typeof ext.type + ' given';
      return ret;
    }

    var type = ext.type = ext.type.toLowerCase();

    // normalize extension type
    if (type === 'language') {
      type = ext.type = 'lang';
    }

    if (type === 'html') {
      type = ext.type = 'output';
    }

    if (type !== 'lang' && type !== 'output' && type !== 'listener') {
      ret.valid = false;
      ret.error = baseMsg + 'type ' + type + ' is not recognized. Valid values: "lang/language", "output/html" or "listener"';
      return ret;
    }

    if (type === 'listener') {
      if (showdown.helper.isUndefined(ext.listeners)) {
        ret.valid = false;
        ret.error = baseMsg + '. Extensions of type "listener" must have a property called "listeners"';
        return ret;
      }
    } else {
      if (showdown.helper.isUndefined(ext.filter) && showdown.helper.isUndefined(ext.regex)) {
        ret.valid = false;
        ret.error = baseMsg + type + ' extensions must define either a "regex" property or a "filter" method';
        return ret;
      }
    }

    if (ext.listeners) {
      if (typeof ext.listeners !== 'object') {
        ret.valid = false;
        ret.error = baseMsg + '"listeners" property must be an object but ' + typeof ext.listeners + ' given';
        return ret;
      }
      for (var ln in ext.listeners) {
        if (ext.listeners.hasOwnProperty(ln)) {
          if (typeof ext.listeners[ln] !== 'function') {
            ret.valid = false;
            ret.error = baseMsg + '"listeners" property must be an hash of [event name]: [callback]. listeners.' + ln +
              ' must be a function but ' + typeof ext.listeners[ln] + ' given';
            return ret;
          }
        }
      }
    }

    if (ext.filter) {
      if (typeof ext.filter !== 'function') {
        ret.valid = false;
        ret.error = baseMsg + '"filter" must be a function, but ' + typeof ext.filter + ' given';
        return ret;
      }
    } else if (ext.regex) {
      if (showdown.helper.isString(ext.regex)) {
        ext.regex = new RegExp(ext.regex, 'g');
      }
      if (!(ext.regex instanceof RegExp)) {
        ret.valid = false;
        ret.error = baseMsg + '"regex" property must either be a string or a RegExp object, but ' + typeof ext.regex + ' given';
        return ret;
      }
      if (showdown.helper.isUndefined(ext.replace)) {
        ret.valid = false;
        ret.error = baseMsg + '"regex" extensions must implement a replace string or function';
        return ret;
      }
    }
  }
  return ret;
}

/**
 * Validate extension
 * @param {object} ext
 * @returns {boolean}
 */
showdown.validateExtension = function (ext) {
  'use strict';

  var validateExtension = validate(ext, null);
  if (!validateExtension.valid) {
    console.warn(validateExtension.error);
    return false;
  }
  return true;
};

/**
 * showdownjs helper functions
 */

if (!showdown.hasOwnProperty('helper')) {
  showdown.helper = {};
}

/**
 * Check if var is string
 * @static
 * @param {string} a
 * @returns {boolean}
 */
showdown.helper.isString = function (a) {
  'use strict';
  return (typeof a === 'string' || a instanceof String);
};

/**
 * Check if var is a function
 * @static
 * @param {*} a
 * @returns {boolean}
 */
showdown.helper.isFunction = function (a) {
  'use strict';
  var getType = {};
  return a && getType.toString.call(a) === '[object Function]';
};

/**
 * isArray helper function
 * @static
 * @param {*} a
 * @returns {boolean}
 */
showdown.helper.isArray = function (a) {
  'use strict';
  return a.constructor === Array;
};

/**
 * Check if value is undefined
 * @static
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
 */
showdown.helper.isUndefined = function (value) {
  'use strict';
  return typeof value === 'undefined';
};

/**
 * ForEach helper function
 * Iterates over Arrays and Objects (own properties only)
 * @static
 * @param {*} obj
 * @param {function} callback Accepts 3 params: 1. value, 2. key, 3. the original array/object
 */
showdown.helper.forEach = function (obj, callback) {
  'use strict';
  // check if obj is defined
  if (showdown.helper.isUndefined(obj)) {
    throw new Error('obj param is required');
  }

  if (showdown.helper.isUndefined(callback)) {
    throw new Error('callback param is required');
  }

  if (!showdown.helper.isFunction(callback)) {
    throw new Error('callback param must be a function/closure');
  }

  if (typeof obj.forEach === 'function') {
    obj.forEach(callback);
  } else if (showdown.helper.isArray(obj)) {
    for (var i = 0; i < obj.length; i++) {
      callback(obj[i], i, obj);
    }
  } else if (typeof (obj) === 'object') {
    for (var prop in obj) {
      if (obj.hasOwnProperty(prop)) {
        callback(obj[prop], prop, obj);
      }
    }
  } else {
    throw new Error('obj does not seem to be an array or an iterable object');
  }
};

/**
 * Standardidize extension name
 * @static
 * @param {string} s extension name
 * @returns {string}
 */
showdown.helper.stdExtName = function (s) {
  'use strict';
  return s.replace(/[_?*+\/\\.^-]/g, '').replace(/\s/g, '').toLowerCase();
};

function escapeCharactersCallback (wholeMatch, m1) {
  'use strict';
  var charCodeToEscape = m1.charCodeAt(0);
  return '¨E' + charCodeToEscape + 'E';
}

/**
 * Callback used to escape characters when passing through String.replace
 * @static
 * @param {string} wholeMatch
 * @param {string} m1
 * @returns {string}
 */
showdown.helper.escapeCharactersCallback = escapeCharactersCallback;

/**
 * Escape characters in a string
 * @static
 * @param {string} text
 * @param {string} charsToEscape
 * @param {boolean} afterBackslash
 * @returns {XML|string|void|*}
 */
showdown.helper.escapeCharacters = function (text, charsToEscape, afterBackslash) {
  'use strict';
  // First we have to escape the escape characters so that
  // we can build a character class out of them
  var regexString = '([' + charsToEscape.replace(/([\[\]\\])/g, '\\$1') + '])';

  if (afterBackslash) {
    regexString = '\\\\' + regexString;
  }

  var regex = new RegExp(regexString, 'g');
  text = text.replace(regex, escapeCharactersCallback);

  return text;
};

var rgxFindMatchPos = function (str, left, right, flags) {
  'use strict';
  var f = flags || '',
      g = f.indexOf('g') > -1,
      x = new RegExp(left + '|' + right, 'g' + f.replace(/g/g, '')),
      l = new RegExp(left, f.replace(/g/g, '')),
      pos = [],
      t, s, m, start, end;

  do {
    t = 0;
    while ((m = x.exec(str))) {
      if (l.test(m[0])) {
        if (!(t++)) {
          s = x.lastIndex;
          start = s - m[0].length;
        }
      } else if (t) {
        if (!--t) {
          end = m.index + m[0].length;
          var obj = {
            left: {start: start, end: s},
            match: {start: s, end: m.index},
            right: {start: m.index, end: end},
            wholeMatch: {start: start, end: end}
          };
          pos.push(obj);
          if (!g) {
            return pos;
          }
        }
      }
    }
  } while (t && (x.lastIndex = s));

  return pos;
};

/**
 * matchRecursiveRegExp
 *
 * (c) 2007 Steven Levithan <stevenlevithan.com>
 * MIT License
 *
 * Accepts a string to search, a left and right format delimiter
 * as regex patterns, and optional regex flags. Returns an array
 * of matches, allowing nested instances of left/right delimiters.
 * Use the "g" flag to return all matches, otherwise only the
 * first is returned. Be careful to ensure that the left and
 * right format delimiters produce mutually exclusive matches.
 * Backreferences are not supported within the right delimiter
 * due to how it is internally combined with the left delimiter.
 * When matching strings whose format delimiters are unbalanced
 * to the left or right, the output is intentionally as a
 * conventional regex library with recursion support would
 * produce, e.g. "<<x>" and "<x>>" both produce ["x"] when using
 * "<" and ">" as the delimiters (both strings contain a single,
 * balanced instance of "<x>").
 *
 * examples:
 * matchRecursiveRegExp("test", "\\(", "\\)")
 * returns: []
 * matchRecursiveRegExp("<t<<e>><s>>t<>", "<", ">", "g")
 * returns: ["t<<e>><s>", ""]
 * matchRecursiveRegExp("<div id=\"x\">test</div>", "<div\\b[^>]*>", "</div>", "gi")
 * returns: ["test"]
 */
showdown.helper.matchRecursiveRegExp = function (str, left, right, flags) {
  'use strict';

  var matchPos = rgxFindMatchPos (str, left, right, flags),
      results = [];

  for (var i = 0; i < matchPos.length; ++i) {
    results.push([
      str.slice(matchPos[i].wholeMatch.start, matchPos[i].wholeMatch.end),
      str.slice(matchPos[i].match.start, matchPos[i].match.end),
      str.slice(matchPos[i].left.start, matchPos[i].left.end),
      str.slice(matchPos[i].right.start, matchPos[i].right.end)
    ]);
  }
  return results;
};

/**
 *
 * @param {string} str
 * @param {string|function} replacement
 * @param {string} left
 * @param {string} right
 * @param {string} flags
 * @returns {string}
 */
showdown.helper.replaceRecursiveRegExp = function (str, replacement, left, right, flags) {
  'use strict';

  if (!showdown.helper.isFunction(replacement)) {
    var repStr = replacement;
    replacement = function () {
      return repStr;
    };
  }

  var matchPos = rgxFindMatchPos(str, left, right, flags),
      finalStr = str,
      lng = matchPos.length;

  if (lng > 0) {
    var bits = [];
    if (matchPos[0].wholeMatch.start !== 0) {
      bits.push(str.slice(0, matchPos[0].wholeMatch.start));
    }
    for (var i = 0; i < lng; ++i) {
      bits.push(
        replacement(
          str.slice(matchPos[i].wholeMatch.start, matchPos[i].wholeMatch.end),
          str.slice(matchPos[i].match.start, matchPos[i].match.end),
          str.slice(matchPos[i].left.start, matchPos[i].left.end),
          str.slice(matchPos[i].right.start, matchPos[i].right.end)
        )
      );
      if (i < lng - 1) {
        bits.push(str.slice(matchPos[i].wholeMatch.end, matchPos[i + 1].wholeMatch.start));
      }
    }
    if (matchPos[lng - 1].wholeMatch.end < str.length) {
      bits.push(str.slice(matchPos[lng - 1].wholeMatch.end));
    }
    finalStr = bits.join('');
  }
  return finalStr;
};

/**
 * Obfuscate an e-mail address through the use of Character Entities,
 * transforming ASCII characters into their equivalent decimal or hex entities.
 *
 * Since it has a random component, subsequent calls to this function produce different results
 *
 * @param {string} mail
 * @returns {string}
 */
showdown.helper.encodeEmailAddress = function (mail) {
  'use strict';
  var encode = [
    function (ch) {
      return '&#' + ch.charCodeAt(0) + ';';
    },
    function (ch) {
      return '&#x' + ch.charCodeAt(0).toString(16) + ';';
    },
    function (ch) {
      return ch;
    }
  ];

  mail = mail.replace(/./g, function (ch) {
    if (ch === '@') {
      // this *must* be encoded. I insist.
      ch = encode[Math.floor(Math.random() * 2)](ch);
    } else {
      var r = Math.random();
      // roughly 10% raw, 45% hex, 45% dec
      ch = (
        r > 0.9 ? encode[2](ch) : r > 0.45 ? encode[1](ch) : encode[0](ch)
      );
    }
    return ch;
  });

  return mail;
};

/**
 * POLYFILLS
 */
// use this instead of builtin is undefined for IE8 compatibility
if (typeof(console) === 'undefined') {
  console = {
    warn: function (msg) {
      'use strict';
      alert(msg);
    },
    log: function (msg) {
      'use strict';
      alert(msg);
    },
    error: function (msg) {
      'use strict';
      throw msg;
    }
  };
}

/**
 * Common regexes.
 * We declare some common regexes to improve performance
 */
showdown.helper.regexes = {
  asteriskAndDash: /([*_])/g
};

/**
 * Created by Estevao on 31-05-2015.
 */

/**
 * Showdown Converter class
 * @class
 * @param {object} [converterOptions]
 * @returns {Converter}
 */
showdown.Converter = function (converterOptions) {
  'use strict';

  var
      /**
       * Options used by this converter
       * @private
       * @type {{}}
       */
      options = {},

      /**
       * Language extensions used by this converter
       * @private
       * @type {Array}
       */
      langExtensions = [],

      /**
       * Output modifiers extensions used by this converter
       * @private
       * @type {Array}
       */
      outputModifiers = [],

      /**
       * Event listeners
       * @private
       * @type {{}}
       */
      listeners = {},

      /**
       * The flavor set in this converter
       */
      setConvFlavor = setFlavor;

  _constructor();

  /**
   * Converter constructor
   * @private
   */
  function _constructor () {
    converterOptions = converterOptions || {};

    for (var gOpt in globalOptions) {
      if (globalOptions.hasOwnProperty(gOpt)) {
        options[gOpt] = globalOptions[gOpt];
      }
    }

    // Merge options
    if (typeof converterOptions === 'object') {
      for (var opt in converterOptions) {
        if (converterOptions.hasOwnProperty(opt)) {
          options[opt] = converterOptions[opt];
        }
      }
    } else {
      throw Error('Converter expects the passed parameter to be an object, but ' + typeof converterOptions +
      ' was passed instead.');
    }

    if (options.extensions) {
      showdown.helper.forEach(options.extensions, _parseExtension);
    }
  }

  /**
   * Parse extension
   * @param {*} ext
   * @param {string} [name='']
   * @private
   */
  function _parseExtension (ext, name) {

    name = name || null;
    // If it's a string, the extension was previously loaded
    if (showdown.helper.isString(ext)) {
      ext = showdown.helper.stdExtName(ext);
      name = ext;

      // LEGACY_SUPPORT CODE
      if (showdown.extensions[ext]) {
        console.warn('DEPRECATION WARNING: ' + ext + ' is an old extension that uses a deprecated loading method.' +
          'Please inform the developer that the extension should be updated!');
        legacyExtensionLoading(showdown.extensions[ext], ext);
        return;
      // END LEGACY SUPPORT CODE

      } else if (!showdown.helper.isUndefined(extensions[ext])) {
        ext = extensions[ext];

      } else {
        throw Error('Extension "' + ext + '" could not be loaded. It was either not found or is not a valid extension.');
      }
    }

    if (typeof ext === 'function') {
      ext = ext();
    }

    if (!showdown.helper.isArray(ext)) {
      ext = [ext];
    }

    var validExt = validate(ext, name);
    if (!validExt.valid) {
      throw Error(validExt.error);
    }

    for (var i = 0; i < ext.length; ++i) {
      switch (ext[i].type) {

        case 'lang':
          langExtensions.push(ext[i]);
          break;

        case 'output':
          outputModifiers.push(ext[i]);
          break;
      }
      if (ext[i].hasOwnProperty('listeners')) {
        for (var ln in ext[i].listeners) {
          if (ext[i].listeners.hasOwnProperty(ln)) {
            listen(ln, ext[i].listeners[ln]);
          }
        }
      }
    }

  }

  /**
   * LEGACY_SUPPORT
   * @param {*} ext
   * @param {string} name
   */
  function legacyExtensionLoading (ext, name) {
    if (typeof ext === 'function') {
      ext = ext(new showdown.Converter());
    }
    if (!showdown.helper.isArray(ext)) {
      ext = [ext];
    }
    var valid = validate(ext, name);

    if (!valid.valid) {
      throw Error(valid.error);
    }

    for (var i = 0; i < ext.length; ++i) {
      switch (ext[i].type) {
        case 'lang':
          langExtensions.push(ext[i]);
          break;
        case 'output':
          outputModifiers.push(ext[i]);
          break;
        default:// should never reach here
          throw Error('Extension loader error: Type unrecognized!!!');
      }
    }
  }

  /**
   * Listen to an event
   * @param {string} name
   * @param {function} callback
   */
  function listen (name, callback) {
    if (!showdown.helper.isString(name)) {
      throw Error('Invalid argument in converter.listen() method: name must be a string, but ' + typeof name + ' given');
    }

    if (typeof callback !== 'function') {
      throw Error('Invalid argument in converter.listen() method: callback must be a function, but ' + typeof callback + ' given');
    }

    if (!listeners.hasOwnProperty(name)) {
      listeners[name] = [];
    }
    listeners[name].push(callback);
  }

  function rTrimInputText (text) {
    var rsp = text.match(/^\s*/)[0].length,
        rgx = new RegExp('^\\s{0,' + rsp + '}', 'gm');
    return text.replace(rgx, '');
  }

  /**
   * Dispatch an event
   * @private
   * @param {string} evtName Event name
   * @param {string} text Text
   * @param {{}} options Converter Options
   * @param {{}} globals
   * @returns {string}
   */
  this._dispatch = function dispatch (evtName, text, options, globals) {
    if (listeners.hasOwnProperty(evtName)) {
      for (var ei = 0; ei < listeners[evtName].length; ++ei) {
        var nText = listeners[evtName][ei](evtName, text, this, options, globals);
        if (nText && typeof nText !== 'undefined') {
          text = nText;
        }
      }
    }
    return text;
  };

  /**
   * Listen to an event
   * @param {string} name
   * @param {function} callback
   * @returns {showdown.Converter}
   */
  this.listen = function (name, callback) {
    listen(name, callback);
    return this;
  };

  /**
   * Converts a markdown string into HTML
   * @param {string} text
   * @returns {*}
   */
  this.makeHtml = function (text) {
    //check if text is not falsy
    if (!text) {
      return text;
    }

    var globals = {
      gHtmlBlocks:     [],
      gHtmlMdBlocks:   [],
      gHtmlSpans:      [],
      gUrls:           {},
      gTitles:         {},
      gDimensions:     {},
      gListLevel:      0,
      hashLinkCounts:  {},
      langExtensions:  langExtensions,
      outputModifiers: outputModifiers,
      converter:       this,
      ghCodeBlocks:    []
    };

    // This lets us use ¨ trema as an escape char to avoid md5 hashes
    // The choice of character is arbitrary; anything that isn't
    // magic in Markdown will work.
    text = text.replace(/¨/g, '¨T');

    // Replace $ with ¨D
    // RegExp interprets $ as a special character
    // when it's in a replacement string
    text = text.replace(/\$/g, '¨D');

    // Standardize line endings
    text = text.replace(/\r\n/g, '\n'); // DOS to Unix
    text = text.replace(/\r/g, '\n'); // Mac to Unix

    // Stardardize line spaces (nbsp causes trouble in older browsers and some regex flavors)
    text = text.replace(/\u00A0/g, ' ');

    if (options.smartIndentationFix) {
      text = rTrimInputText(text);
    }

    // Make sure text begins and ends with a couple of newlines:
    text = '\n\n' + text + '\n\n';

    // detab
    text = showdown.subParser('detab')(text, options, globals);

    /**
     * Strip any lines consisting only of spaces and tabs.
     * This makes subsequent regexs easier to write, because we can
     * match consecutive blank lines with /\n+/ instead of something
     * contorted like /[ \t]*\n+/
     */
    text = text.replace(/^[ \t]+$/mg, '');

    //run languageExtensions
    showdown.helper.forEach(langExtensions, function (ext) {
      text = showdown.subParser('runExtension')(ext, text, options, globals);
    });

    // run the sub parsers
    text = showdown.subParser('hashPreCodeTags')(text, options, globals);
    text = showdown.subParser('githubCodeBlocks')(text, options, globals);
    text = showdown.subParser('hashHTMLBlocks')(text, options, globals);
    text = showdown.subParser('hashCodeTags')(text, options, globals);
    text = showdown.subParser('stripLinkDefinitions')(text, options, globals);
    text = showdown.subParser('blockGamut')(text, options, globals);
    text = showdown.subParser('unhashHTMLSpans')(text, options, globals);
    text = showdown.subParser('unescapeSpecialChars')(text, options, globals);

    // attacklab: Restore dollar signs
    text = text.replace(/¨D/g, '$$');

    // attacklab: Restore tremas
    text = text.replace(/¨T/g, '¨');

    // Run output modifiers
    showdown.helper.forEach(outputModifiers, function (ext) {
      text = showdown.subParser('runExtension')(ext, text, options, globals);
    });

    return text;
  };

  /**
   * Set an option of this Converter instance
   * @param {string} key
   * @param {*} value
   */
  this.setOption = function (key, value) {
    options[key] = value;
  };

  /**
   * Get the option of this Converter instance
   * @param {string} key
   * @returns {*}
   */
  this.getOption = function (key) {
    return options[key];
  };

  /**
   * Get the options of this Converter instance
   * @returns {{}}
   */
  this.getOptions = function () {
    return options;
  };

  /**
   * Add extension to THIS converter
   * @param {{}} extension
   * @param {string} [name=null]
   */
  this.addExtension = function (extension, name) {
    name = name || null;
    _parseExtension(extension, name);
  };

  /**
   * Use a global registered extension with THIS converter
   * @param {string} extensionName Name of the previously registered extension
   */
  this.useExtension = function (extensionName) {
    _parseExtension(extensionName);
  };

  /**
   * Set the flavor THIS converter should use
   * @param {string} name
   */
  this.setFlavor = function (name) {
    if (!flavor.hasOwnProperty(name)) {
      throw Error(name + ' flavor was not found');
    }
    var preset = flavor[name];
    setConvFlavor = name;
    for (var option in preset) {
      if (preset.hasOwnProperty(option)) {
        options[option] = preset[option];
      }
    }
  };

  /**
   * Get the currently set flavor of this converter
   * @returns {string}
   */
  this.getFlavor = function () {
    return setConvFlavor;
  };

  /**
   * Remove an extension from THIS converter.
   * Note: This is a costly operation. It's better to initialize a new converter
   * and specify the extensions you wish to use
   * @param {Array} extension
   */
  this.removeExtension = function (extension) {
    if (!showdown.helper.isArray(extension)) {
      extension = [extension];
    }
    for (var a = 0; a < extension.length; ++a) {
      var ext = extension[a];
      for (var i = 0; i < langExtensions.length; ++i) {
        if (langExtensions[i] === ext) {
          langExtensions[i].splice(i, 1);
        }
      }
      for (var ii = 0; ii < outputModifiers.length; ++i) {
        if (outputModifiers[ii] === ext) {
          outputModifiers[ii].splice(i, 1);
        }
      }
    }
  };

  /**
   * Get all extension of THIS converter
   * @returns {{language: Array, output: Array}}
   */
  this.getAllExtensions = function () {
    return {
      language: langExtensions,
      output: outputModifiers
    };
  };
};

/**
 * Turn Markdown link shortcuts into XHTML <a> tags.
 */
showdown.subParser('anchors', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('anchors.before', text, options, globals);

  var writeAnchorTag = function (wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
    if (showdown.helper.isUndefined(m7)) {
      m7 = '';
    }
    wholeMatch = m1;
    var linkText = m2,
        linkId = m3.toLowerCase(),
        url = m4,
        title = m7;

    if (!url) {
      if (!linkId) {
        // lower-case and turn embedded newlines into spaces
        linkId = linkText.toLowerCase().replace(/ ?\n/g, ' ');
      }
      url = '#' + linkId;

      if (!showdown.helper.isUndefined(globals.gUrls[linkId])) {
        url = globals.gUrls[linkId];
        if (!showdown.helper.isUndefined(globals.gTitles[linkId])) {
          title = globals.gTitles[linkId];
        }
      } else {
        if (wholeMatch.search(/\(\s*\)$/m) > -1) {
          // Special case for explicit empty url
          url = '';
        } else {
          return wholeMatch;
        }
      }
    }

    //url = showdown.helper.escapeCharacters(url, '*_', false); // replaced line to improve performance
    url = url.replace(showdown.helper.regexes.asteriskAndDash, showdown.helper.escapeCharactersCallback);

    var result = '<a href="' + url + '"';

    if (title !== '' && title !== null) {
      title = title.replace(/"/g, '&quot;');
      //title = showdown.helper.escapeCharacters(title, '*_', false); // replaced line to improve performance
      title = title.replace(showdown.helper.regexes.asteriskAndDash, showdown.helper.escapeCharactersCallback);
      result += ' title="' + title + '"';
    }

    result += '>' + linkText + '</a>';

    return result;
  };

  // First, handle reference-style links: [link text] [id]
  text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)][ ]?(?:\n[ ]*)?\[(.*?)])()()()()/g, writeAnchorTag);

  // Next, inline-style links: [link text](url "optional title")
  text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,
                      writeAnchorTag);

  // handle reference-style shortcuts: [link text]
  // These must come last in case you've also got [link test][1]
  // or [link test](/foo)
  text = text.replace(/(\[([^\[\]]+)])()()()()()/g, writeAnchorTag);

  // Lastly handle GithubMentions if option is enabled
  if (options.ghMentions) {
    text = text.replace(/(^|\s)(\\)?(@([a-z\d\-]+))(?=[.!?;,[\]()]|\s|$)/gmi, function (wm, st, escape, mentions, username) {
      if (escape === '\\') {
        return st + mentions;
      }

      //check if options.ghMentionsLink is a string
      if (!showdown.helper.isString(options.ghMentionsLink)) {
        throw new Error('ghMentionsLink option must be a string');
      }
      var lnk = options.ghMentionsLink.replace(/\{u}/g, username);
      return st + '<a href="' + lnk + '">' + mentions + '</a>';
    });
  }

  text = globals.converter._dispatch('anchors.after', text, options, globals);
  return text;
});

showdown.subParser('autoLinks', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('autoLinks.before', text, options, globals);

  var simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[^'">\s]+\.[^'">\s]+)()(?=\s|$)(?!["<>])/gi,
      simpleURLRegex2 = /\b(((https?|ftp|dict):\/\/|www\.)[^'">\s]+\.[^'">\s]+?)([.!?()]?)(?=\s|$)(?!["<>])/gi,
      delimUrlRegex   = /<(((https?|ftp|dict):\/\/|www\.)[^'">\s]+)>/gi,
      simpleMailRegex = /(^|\s)(?:mailto:)?([A-Za-z0-9!#$%&'*+-/=?^_`{|}~.]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)(?=$|\s)/gmi,
      delimMailRegex  = /<()(?:mailto:)?([-.\w]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi;

  text = text.replace(delimUrlRegex, replaceLink);
  text = text.replace(delimMailRegex, replaceMail);
  // simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[-.+~:?#@!$&'()*,;=[\]\w]+)\b/gi,
  // Email addresses: <address@domain.foo>

  if (options.simplifiedAutoLink) {
    if (options.excludeTrailingPunctuationFromURLs) {
      text = text.replace(simpleURLRegex2, replaceLink);
    } else {
      text = text.replace(simpleURLRegex, replaceLink);
    }
    text = text.replace(simpleMailRegex, replaceMail);
  }

  function replaceLink (wm, link, m2, m3, trailingPunctuation) {
    var lnkTxt = link,
        append = '';
    if (/^www\./i.test(link)) {
      link = link.replace(/^www\./i, 'http://www.');
    }
    if (options.excludeTrailingPunctuationFromURLs && trailingPunctuation) {
      append = trailingPunctuation;
    }
    return '<a href="' + link + '">' + lnkTxt + '</a>' + append;
  }

  function replaceMail (wholeMatch, b, mail) {
    var href = 'mailto:';
    b = b || '';
    mail = showdown.subParser('unescapeSpecialChars')(mail, options, globals);
    if (options.encodeEmails) {
      href = showdown.helper.encodeEmailAddress(href + mail);
      mail = showdown.helper.encodeEmailAddress(mail);
    } else {
      href = href + mail;
    }
    return b + '<a href="' + href + '">' + mail + '</a>';
  }

  text = globals.converter._dispatch('autoLinks.after', text, options, globals);

  return text;
});

/**
 * These are all the transformations that form block-level
 * tags like paragraphs, headers, and list items.
 */
showdown.subParser('blockGamut', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('blockGamut.before', text, options, globals);

  // we parse blockquotes first so that we can have headings and hrs
  // inside blockquotes
  text = showdown.subParser('blockQuotes')(text, options, globals);
  text = showdown.subParser('headers')(text, options, globals);

  // Do Horizontal Rules:
  text = showdown.subParser('horizontalRule')(text, options, globals);

  text = showdown.subParser('lists')(text, options, globals);
  text = showdown.subParser('codeBlocks')(text, options, globals);
  text = showdown.subParser('tables')(text, options, globals);

  // We already ran _HashHTMLBlocks() before, in Markdown(), but that
  // was to escape raw HTML in the original Markdown source. This time,
  // we're escaping the markup we've just created, so that we don't wrap
  // <p> tags around block-level tags.
  text = showdown.subParser('hashHTMLBlocks')(text, options, globals);
  text = showdown.subParser('paragraphs')(text, options, globals);

  text = globals.converter._dispatch('blockGamut.after', text, options, globals);

  return text;
});

showdown.subParser('blockQuotes', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('blockQuotes.before', text, options, globals);

  text = text.replace(/((^ {0,3}>[ \t]?.+\n(.+\n)*\n*)+)/gm, function (wholeMatch, m1) {
    var bq = m1;

    // attacklab: hack around Konqueror 3.5.4 bug:
    // "----------bug".replace(/^-/g,"") == "bug"
    bq = bq.replace(/^[ \t]*>[ \t]?/gm, '¨0'); // trim one level of quoting

    // attacklab: clean up hack
    bq = bq.replace(/¨0/g, '');

    bq = bq.replace(/^[ \t]+$/gm, ''); // trim whitespace-only lines
    bq = showdown.subParser('githubCodeBlocks')(bq, options, globals);
    bq = showdown.subParser('blockGamut')(bq, options, globals); // recurse

    bq = bq.replace(/(^|\n)/g, '$1  ');
    // These leading spaces screw with <pre> content, so we need to fix that:
    bq = bq.replace(/(\s*<pre>[^\r]+?<\/pre>)/gm, function (wholeMatch, m1) {
      var pre = m1;
      // attacklab: hack around Konqueror 3.5.4 bug:
      pre = pre.replace(/^  /mg, '¨0');
      pre = pre.replace(/¨0/g, '');
      return pre;
    });

    return showdown.subParser('hashBlock')('<blockquote>\n' + bq + '\n</blockquote>', options, globals);
  });

  text = globals.converter._dispatch('blockQuotes.after', text, options, globals);
  return text;
});

/**
 * Process Markdown `<pre><code>` blocks.
 */
showdown.subParser('codeBlocks', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('codeBlocks.before', text, options, globals);

  // sentinel workarounds for lack of \A and \Z, safari\khtml bug
  text += '¨0';

  var pattern = /(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=¨0))/g;
  text = text.replace(pattern, function (wholeMatch, m1, m2) {
    var codeblock = m1,
        nextChar = m2,
        end = '\n';

    codeblock = showdown.subParser('outdent')(codeblock, options, globals);
    codeblock = showdown.subParser('encodeCode')(codeblock, options, globals);
    codeblock = showdown.subParser('detab')(codeblock, options, globals);
    codeblock = codeblock.replace(/^\n+/g, ''); // trim leading newlines
    codeblock = codeblock.replace(/\n+$/g, ''); // trim trailing newlines

    if (options.omitExtraWLInCodeBlocks) {
      end = '';
    }

    codeblock = '<pre><code>' + codeblock + end + '</code></pre>';

    return showdown.subParser('hashBlock')(codeblock, options, globals) + nextChar;
  });

  // strip sentinel
  text = text.replace(/¨0/, '');

  text = globals.converter._dispatch('codeBlocks.after', text, options, globals);
  return text;
});

/**
 *
 *   *  Backtick quotes are used for <code></code> spans.
 *
 *   *  You can use multiple backticks as the delimiters if you want to
 *     include literal backticks in the code span. So, this input:
 *
 *         Just type ``foo `bar` baz`` at the prompt.
 *
 *       Will translate to:
 *
 *         <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
 *
 *    There's no arbitrary limit to the number of backticks you
 *    can use as delimters. If you need three consecutive backticks
 *    in your code, use four for delimiters, etc.
 *
 *  *  You can use spaces to get literal backticks at the edges:
 *
 *         ... type `` `bar` `` ...
 *
 *       Turns to:
 *
 *         ... type <code>`bar`</code> ...
 */
showdown.subParser('codeSpans', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('codeSpans.before', text, options, globals);

  if (typeof(text) === 'undefined') {
    text = '';
  }
  text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
    function (wholeMatch, m1, m2, m3) {
      var c = m3;
      c = c.replace(/^([ \t]*)/g, '');	// leading whitespace
      c = c.replace(/[ \t]*$/g, '');	// trailing whitespace
      c = showdown.subParser('encodeCode')(c, options, globals);
      return m1 + '<code>' + c + '</code>';
    }
  );

  text = globals.converter._dispatch('codeSpans.after', text, options, globals);
  return text;
});

/**
 * Convert all tabs to spaces
 */
showdown.subParser('detab', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('detab.before', text, options, globals);

  // expand first n-1 tabs
  text = text.replace(/\t(?=\t)/g, '    '); // g_tab_width

  // replace the nth with two sentinels
  text = text.replace(/\t/g, '¨A¨B');

  // use the sentinel to anchor our regex so it doesn't explode
  text = text.replace(/¨B(.+?)¨A/g, function (wholeMatch, m1) {
    var leadingText = m1,
        numSpaces = 4 - leadingText.length % 4;  // g_tab_width

    // there *must* be a better way to do this:
    for (var i = 0; i < numSpaces; i++) {
      leadingText += ' ';
    }

    return leadingText;
  });

  // clean up sentinels
  text = text.replace(/¨A/g, '    ');  // g_tab_width
  text = text.replace(/¨B/g, '');

  text = globals.converter._dispatch('detab.after', text, options, globals);
  return text;
});

/**
 * Smart processing for ampersands and angle brackets that need to be encoded.
 */
showdown.subParser('encodeAmpsAndAngles', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('encodeAmpsAndAngles.before', text, options, globals);

  // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
  // http://bumppo.net/projects/amputator/
  text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, '&amp;');

  // Encode naked <'s
  text = text.replace(/<(?![a-z\/?$!])/gi, '&lt;');

  // Encode <
  text = text.replace(/</g, '&lt;');

  // Encode >
  text = text.replace(/>/g, '&gt;');

  text = globals.converter._dispatch('encodeAmpsAndAngles.after', text, options, globals);
  return text;
});

/**
 * Returns the string, with after processing the following backslash escape sequences.
 *
 * attacklab: The polite way to do this is with the new escapeCharacters() function:
 *
 *    text = escapeCharacters(text,"\\",true);
 *    text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
 *
 * ...but we're sidestepping its use of the (slow) RegExp constructor
 * as an optimization for Firefox.  This function gets called a LOT.
 */
showdown.subParser('encodeBackslashEscapes', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('encodeBackslashEscapes.before', text, options, globals);

  text = text.replace(/\\(\\)/g, showdown.helper.escapeCharactersCallback);
  text = text.replace(/\\([`*_{}\[\]()>#+.!~=-])/g, showdown.helper.escapeCharactersCallback);

  text = globals.converter._dispatch('encodeBackslashEscapes.after', text, options, globals);
  return text;
});

/**
 * Encode/escape certain characters inside Markdown code runs.
 * The point is that in code, these characters are literals,
 * and lose their special Markdown meanings.
 */
showdown.subParser('encodeCode', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('encodeCode.before', text, options, globals);

  // Encode all ampersands; HTML entities are not
  // entities within a Markdown code span.
  text = text
    .replace(/&/g, '&amp;')
  // Do the angle bracket song and dance:
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
  // Now, escape characters that are magic in Markdown:
    .replace(/([*_{}\[\]\\=~-])/g, showdown.helper.escapeCharactersCallback);

  text = globals.converter._dispatch('encodeCode.after', text, options, globals);
  return text;
});

/**
 * Within tags -- meaning between < and > -- encode [\ ` * _ ~ =] so they
 * don't conflict with their use in Markdown for code, italics and strong.
 */
showdown.subParser('escapeSpecialCharsWithinTagAttributes', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('escapeSpecialCharsWithinTagAttributes.before', text, options, globals);

  // Build a regex to find HTML tags and comments.  See Friedl's
  // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
  var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;

  text = text.replace(regex, function (wholeMatch) {
    return wholeMatch
      .replace(/(.)<\/?code>(?=.)/g, '$1`')
      .replace(/([\\`*_~=])/g, showdown.helper.escapeCharactersCallback);
  });

  text = globals.converter._dispatch('escapeSpecialCharsWithinTagAttributes.after', text, options, globals);
  return text;
});

/**
 * Handle github codeblocks prior to running HashHTML so that
 * HTML contained within the codeblock gets escaped properly
 * Example:
 * ```ruby
 *     def hello_world(x)
 *       puts "Hello, #{x}"
 *     end
 * ```
 */
showdown.subParser('githubCodeBlocks', function (text, options, globals) {
  'use strict';

  // early exit if option is not enabled
  if (!options.ghCodeBlocks) {
    return text;
  }

  text = globals.converter._dispatch('githubCodeBlocks.before', text, options, globals);

  text += '¨0';

  text = text.replace(/(?:^|\n)```(.*)\n([\s\S]*?)\n```/g, function (wholeMatch, language, codeblock) {
    var end = (options.omitExtraWLInCodeBlocks) ? '' : '\n';

    // First parse the github code block
    codeblock = showdown.subParser('encodeCode')(codeblock, options, globals);
    codeblock = showdown.subParser('detab')(codeblock, options, globals);
    codeblock = codeblock.replace(/^\n+/g, ''); // trim leading newlines
    codeblock = codeblock.replace(/\n+$/g, ''); // trim trailing whitespace

    codeblock = '<pre><code' + (language ? ' class="' + language + ' language-' + language + '"' : '') + '>' + codeblock + end + '</code></pre>';

    codeblock = showdown.subParser('hashBlock')(codeblock, options, globals);

    // Since GHCodeblocks can be false positives, we need to
    // store the primitive text and the parsed text in a global var,
    // and then return a token
    return '\n\n¨G' + (globals.ghCodeBlocks.push({text: wholeMatch, codeblock: codeblock}) - 1) + 'G\n\n';
  });

  // attacklab: strip sentinel
  text = text.replace(/¨0/, '');

  return globals.converter._dispatch('githubCodeBlocks.after', text, options, globals);
});

showdown.subParser('hashBlock', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('hashBlock.before', text, options, globals);
  text = text.replace(/(^\n+|\n+$)/g, '');
  text = '\n\n¨K' + (globals.gHtmlBlocks.push(text) - 1) + 'K\n\n';
  text = globals.converter._dispatch('hashBlock.after', text, options, globals);
  return text;
});

/**
 * Hash and escape <code> elements that should not be parsed as markdown
 */
showdown.subParser('hashCodeTags', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('hashCodeTags.before', text, options, globals);

  var repFunc = function (wholeMatch, match, left, right) {
    var codeblock = left + showdown.subParser('encodeCode')(match, options, globals) + right;
    return '¨C' + (globals.gHtmlSpans.push(codeblock) - 1) + 'C';
  };

  // Hash naked <code>
  text = showdown.helper.replaceRecursiveRegExp(text, repFunc, '<code\\b[^>]*>', '</code>', 'gim');

  text = globals.converter._dispatch('hashCodeTags.after', text, options, globals);
  return text;
});

showdown.subParser('hashElement', function (text, options, globals) {
  'use strict';

  return function (wholeMatch, m1) {
    var blockText = m1;

    // Undo double lines
    blockText = blockText.replace(/\n\n/g, '\n');
    blockText = blockText.replace(/^\n/, '');

    // strip trailing blank lines
    blockText = blockText.replace(/\n+$/g, '');

    // Replace the element text with a marker ("¨KxK" where x is its key)
    blockText = '\n\n¨K' + (globals.gHtmlBlocks.push(blockText) - 1) + 'K\n\n';

    return blockText;
  };
});

showdown.subParser('hashHTMLBlocks', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('hashHTMLBlocks.before', text, options, globals);

  var blockTags = [
        'pre',
        'div',
        'h1',
        'h2',
        'h3',
        'h4',
        'h5',
        'h6',
        'blockquote',
        'table',
        'dl',
        'ol',
        'ul',
        'script',
        'noscript',
        'form',
        'fieldset',
        'iframe',
        'math',
        'style',
        'section',
        'header',
        'footer',
        'nav',
        'article',
        'aside',
        'address',
        'audio',
        'canvas',
        'figure',
        'hgroup',
        'output',
        'video',
        'p'
      ],
      repFunc = function (wholeMatch, match, left, right) {
        var txt = wholeMatch;
        // check if this html element is marked as markdown
        // if so, it's contents should be parsed as markdown
        if (left.search(/\bmarkdown\b/) !== -1) {
          txt = left + globals.converter.makeHtml(match) + right;
        }
        return '\n\n¨K' + (globals.gHtmlBlocks.push(txt) - 1) + 'K\n\n';
      };

  for (var i = 0; i < blockTags.length; ++i) {
    text = showdown.helper.replaceRecursiveRegExp(text, repFunc, '^ {0,3}<' + blockTags[i] + '\\b[^>]*>', '</' + blockTags[i] + '>', 'gim');
  }

  // HR SPECIAL CASE
  text = text.replace(/(\n {0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,
    showdown.subParser('hashElement')(text, options, globals));

  // Special case for standalone HTML comments
  text = showdown.helper.replaceRecursiveRegExp(text, function (txt) {
    return '\n\n¨K' + (globals.gHtmlBlocks.push(txt) - 1) + 'K\n\n';
  }, '^ {0,3}<!--', '-->', 'gm');

  // PHP and ASP-style processor instructions (<?...?> and <%...%>)
  text = text.replace(/(?:\n\n)( {0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,
    showdown.subParser('hashElement')(text, options, globals));

  text = globals.converter._dispatch('hashHTMLBlocks.after', text, options, globals);
  return text;
});

/**
 * Hash span elements that should not be parsed as markdown
 */
showdown.subParser('hashHTMLSpans', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('hashHTMLSpans.before', text, options, globals);

  function hashHTMLSpan (html) {
    return '¨C' + (globals.gHtmlSpans.push(html) - 1) + 'C';
  }

  // Hash Self Closing tags
  text = text.replace(/<[^>]+?\/>/gi, function (wm) {
    return hashHTMLSpan(wm);
  });

  // Hash tags without properties
  text = text.replace(/<([^>]+?)>[\s\S]*?<\/\1>/g, function (wm) {
    return hashHTMLSpan(wm);
  });

  // Hash tags with properties
  text = text.replace(/<([^>]+?)\s[^>]+?>[\s\S]*?<\/\1>/g, function (wm) {
    return hashHTMLSpan(wm);
  });

  // Hash self closing tags without />
  text = text.replace(/<[^>]+?>/gi, function (wm) {
    return hashHTMLSpan(wm);
  });

  /*showdown.helper.matchRecursiveRegExp(text, '<code\\b[^>]*>', '</code>', 'gi');*/

  text = globals.converter._dispatch('hashHTMLSpans.after', text, options, globals);
  return text;
});

/**
 * Unhash HTML spans
 */
showdown.subParser('unhashHTMLSpans', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('unhashHTMLSpans.before', text, options, globals);

  for (var i = 0; i < globals.gHtmlSpans.length; ++i) {
    var repText = globals.gHtmlSpans[i],
        // limiter to prevent infinite loop (assume 10 as limit for recurse)
        limit = 0;

    while (/¨C(\d+)C/.test(repText)) {
      var num = RegExp.$1;
      repText = repText.replace('¨C' + num + 'C', globals.gHtmlSpans[num]);
      if (limit === 10) {
        break;
      }
      ++limit;
    }
    text = text.replace('¨C' + i + 'C', repText);
  }

  text = globals.converter._dispatch('unhashHTMLSpans.after', text, options, globals);
  return text;
});

/**
 * Hash and escape <pre><code> elements that should not be parsed as markdown
 */
showdown.subParser('hashPreCodeTags', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('hashPreCodeTags.before', text, options, globals);

  var repFunc = function (wholeMatch, match, left, right) {
    // encode html entities
    var codeblock = left + showdown.subParser('encodeCode')(match, options, globals) + right;
    return '\n\n¨G' + (globals.ghCodeBlocks.push({text: wholeMatch, codeblock: codeblock}) - 1) + 'G\n\n';
  };

  // Hash <pre><code>
  text = showdown.helper.replaceRecursiveRegExp(text, repFunc, '^ {0,3}<pre\\b[^>]*>\\s*<code\\b[^>]*>', '^ {0,3}</code>\\s*</pre>', 'gim');

  text = globals.converter._dispatch('hashPreCodeTags.after', text, options, globals);
  return text;
});

showdown.subParser('headers', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('headers.before', text, options, globals);

  var headerLevelStart = (isNaN(parseInt(options.headerLevelStart))) ? 1 : parseInt(options.headerLevelStart),
      ghHeaderId = options.ghCompatibleHeaderId,

  // Set text-style headers:
  //	Header 1
  //	========
  //
  //	Header 2
  //	--------
  //
      setextRegexH1 = (options.smoothLivePreview) ? /^(.+)[ \t]*\n={2,}[ \t]*\n+/gm : /^(.+)[ \t]*\n=+[ \t]*\n+/gm,
      setextRegexH2 = (options.smoothLivePreview) ? /^(.+)[ \t]*\n-{2,}[ \t]*\n+/gm : /^(.+)[ \t]*\n-+[ \t]*\n+/gm;

  text = text.replace(setextRegexH1, function (wholeMatch, m1) {

    var spanGamut = showdown.subParser('spanGamut')(m1, options, globals),
        hID = (options.noHeaderId) ? '' : ' id="' + headerId(m1) + '"',
        hLevel = headerLevelStart,
        hashBlock = '<h' + hLevel + hID + '>' + spanGamut + '</h' + hLevel + '>';
    return showdown.subParser('hashBlock')(hashBlock, options, globals);
  });

  text = text.replace(setextRegexH2, function (matchFound, m1) {
    var spanGamut = showdown.subParser('spanGamut')(m1, options, globals),
        hID = (options.noHeaderId) ? '' : ' id="' + headerId(m1) + '"',
        hLevel = headerLevelStart + 1,
        hashBlock = '<h' + hLevel + hID + '>' + spanGamut + '</h' + hLevel + '>';
    return showdown.subParser('hashBlock')(hashBlock, options, globals);
  });

  // atx-style headers:
  //  # Header 1
  //  ## Header 2
  //  ## Header 2 with closing hashes ##
  //  ...
  //  ###### Header 6
  //
  var atxStyle = (options.requireSpaceBeforeHeadingText) ? /^(#{1,6})[ \t]+(.+?)[ \t]*#*\n+/gm : /^(#{1,6})[ \t]*(.+?)[ \t]*#*\n+/gm;

  text = text.replace(atxStyle, function (wholeMatch, m1, m2) {
    var span = showdown.subParser('spanGamut')(m2, options, globals),
        hID = (options.noHeaderId) ? '' : ' id="' + headerId(m2) + '"',
        hLevel = headerLevelStart - 1 + m1.length,
        header = '<h' + hLevel + hID + '>' + span + '</h' + hLevel + '>';

    return showdown.subParser('hashBlock')(header, options, globals);
  });

  function headerId (m) {
    var title;
    // Prefix id to prevent causing inadvertent pre-existing style matches.
    if (showdown.helper.isString(options.prefixHeaderId)) {
      title = options.prefixHeaderId + m;
    } else if (options.prefixHeaderId === true) {
      title = 'section ' + m;
    } else {
      title = m;
    }

    if (ghHeaderId) {
      title = title
        .replace(/ /g, '-')
        // replace previously escaped chars (&, ¨ and $)
        .replace(/&amp;/g, '')
        .replace(/¨T/g, '')
        .replace(/¨D/g, '')
        // replace rest of the chars (&~$ are repeated as they might have been escaped)
        // borrowed from github's redcarpet (some they should produce similar results)
        .replace(/[&+$,\/:;=?@"#{}|^¨~\[\]`\\*)(%.!'<>]/g, '')
        .toLowerCase();
    } else {
      title = title
        .replace(/[^\w]/g, '')
        .toLowerCase();
    }

    if (globals.hashLinkCounts[title]) {
      title = title + '-' + (globals.hashLinkCounts[title]++);
    } else {
      globals.hashLinkCounts[title] = 1;
    }
    return title;
  }

  text = globals.converter._dispatch('headers.after', text, options, globals);
  return text;
});

/**
 * Turn Markdown link shortcuts into XHTML <a> tags.
 */
showdown.subParser('horizontalRule', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('horizontalRule.before', text, options, globals);

  var key = showdown.subParser('hashBlock')('<hr />', options, globals);
  text = text.replace(/^ {0,2}( ?-){3,}[ \t]*$/gm, key);
  text = text.replace(/^ {0,2}( ?\*){3,}[ \t]*$/gm, key);
  text = text.replace(/^ {0,2}( ?_){3,}[ \t]*$/gm, key);

  text = globals.converter._dispatch('horizontalRule.after', text, options, globals);
  return text;
});

/**
 * Turn Markdown image shortcuts into <img> tags.
 */
showdown.subParser('images', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('images.before', text, options, globals);

  var inlineRegExp    = /!\[(.*?)]\s?\([ \t]*()<?(\S+?)>?(?: =([*\d]+[A-Za-z%]{0,4})x([*\d]+[A-Za-z%]{0,4}))?[ \t]*(?:(['"])(.*?)\6[ \t]*)?\)/g,
      referenceRegExp = /!\[([^\]]*?)] ?(?:\n *)?\[(.*?)]()()()()()/g;

  function writeImageTag (wholeMatch, altText, linkId, url, width, height, m5, title) {

    var gUrls   = globals.gUrls,
        gTitles = globals.gTitles,
        gDims   = globals.gDimensions;

    linkId = linkId.toLowerCase();

    if (!title) {
      title = '';
    }

    if (url === '' || url === null) {
      if (linkId === '' || linkId === null) {
        // lower-case and turn embedded newlines into spaces
        linkId = altText.toLowerCase().replace(/ ?\n/g, ' ');
      }
      url = '#' + linkId;

      if (!showdown.helper.isUndefined(gUrls[linkId])) {
        url = gUrls[linkId];
        if (!showdown.helper.isUndefined(gTitles[linkId])) {
          title = gTitles[linkId];
        }
        if (!showdown.helper.isUndefined(gDims[linkId])) {
          width = gDims[linkId].width;
          height = gDims[linkId].height;
        }
      } else {
        return wholeMatch;
      }
    }

    altText = altText
      .replace(/"/g, '&quot;')
    //altText = showdown.helper.escapeCharacters(altText, '*_', false);
      .replace(showdown.helper.regexes.asteriskAndDash, showdown.helper.escapeCharactersCallback);
    //url = showdown.helper.escapeCharacters(url, '*_', false);
    url = url.replace(showdown.helper.regexes.asteriskAndDash, showdown.helper.escapeCharactersCallback);
    var result = '<img src="' + url + '" alt="' + altText + '"';

    if (title) {
      title = title
        .replace(/"/g, '&quot;')
      //title = showdown.helper.escapeCharacters(title, '*_', false);
        .replace(showdown.helper.regexes.asteriskAndDash, showdown.helper.escapeCharactersCallback);
      result += ' title="' + title + '"';
    }

    if (width && height) {
      width  = (width === '*') ? 'auto' : width;
      height = (height === '*') ? 'auto' : height;

      result += ' width="' + width + '"';
      result += ' height="' + height + '"';
    }

    result += ' />';

    return result;
  }

  // First, handle reference-style labeled images: ![alt text][id]
  text = text.replace(referenceRegExp, writeImageTag);

  // Next, handle inline images:  ![alt text](url =<width>x<height> "optional title")
  text = text.replace(inlineRegExp, writeImageTag);

  text = globals.converter._dispatch('images.after', text, options, globals);
  return text;
});

showdown.subParser('italicsAndBold', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('italicsAndBold.before', text, options, globals);

  // it's faster to have 3 separate regexes for each case than have just one
  // because of backtracing, in some cases, it could lead to an exponential effect
  // called "catastrophic backtrace". Ominous!

  // Parse underscores
  if (options.literalMidWordUnderscores) {
    text = text.replace(/\b___(\S[\s\S]*)___\b/g, '<strong><em>$1</em></strong>');
    text = text.replace(/\b__(\S[\s\S]*)__\b/g, '<strong>$1</strong>');
    text = text.replace(/\b_(\S[\s\S]*?)_\b/g, '<em>$1</em>');
  } else {
    text = text.replace(/___(\S[\s\S]*?)___/g, function (wm, m) {
      return (/\S$/.test(m)) ? '<strong><em>' + m + '</em></strong>' : wm;
    });
    text = text.replace(/__(\S[\s\S]*?)__/g, function (wm, m) {
      return (/\S$/.test(m)) ? '<strong>' + m + '</strong>' : wm;
    });
    text = text.replace(/_([^\s_][\s\S]*?)_/g, function (wm, m) {
      // !/^_[^_]/.test(m) - test if it doesn't start with __ (since it seems redundant, we removed it)
      return (/\S$/.test(m)) ? '<em>' + m + '</em>' : wm;
    });
  }

  // Now parse asterisks
  text = text.replace(/\*\*\*(\S[\s\S]*?)\*\*\*/g, function (wm, m) {
    return (/\S$/.test(m)) ? '<strong><em>' + m + '</em></strong>' : wm;
  });
  text = text.replace(/\*\*(\S[\s\S]*?)\*\*/g, function (wm, m) {
    return (/\S$/.test(m)) ? '<strong>' + m + '</strong>' : wm;
  });
  text = text.replace(/\*([^\s*][\s\S]*?)\*/g, function (wm, m) {
    // !/^\*[^*]/.test(m) - test if it doesn't start with ** (since it seems redundant, we removed it)
    return (/\S$/.test(m)) ? '<em>' + m + '</em>' : wm;
  });

  text = globals.converter._dispatch('italicsAndBold.after', text, options, globals);
  return text;
});

/**
 * Form HTML ordered (numbered) and unordered (bulleted) lists.
 */
showdown.subParser('lists', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('lists.before', text, options, globals);

  /**
   * Process the contents of a single ordered or unordered list, splitting it
   * into individual list items.
   * @param {string} listStr
   * @param {boolean} trimTrailing
   * @returns {string}
   */
  function processListItems (listStr, trimTrailing) {
    // The $g_list_level global keeps track of when we're inside a list.
    // Each time we enter a list, we increment it; when we leave a list,
    // we decrement. If it's zero, we're not in a list anymore.
    //
    // We do this because when we're not inside a list, we want to treat
    // something like this:
    //
    //    I recommend upgrading to version
    //    8. Oops, now this line is treated
    //    as a sub-list.
    //
    // As a single paragraph, despite the fact that the second line starts
    // with a digit-period-space sequence.
    //
    // Whereas when we're inside a list (or sub-list), that line will be
    // treated as the start of a sub-list. What a kludge, huh? This is
    // an aspect of Markdown's syntax that's hard to parse perfectly
    // without resorting to mind-reading. Perhaps the solution is to
    // change the syntax rules such that sub-lists must start with a
    // starting cardinal number; e.g. "1." or "a.".
    globals.gListLevel++;

    // trim trailing blank lines:
    listStr = listStr.replace(/\n{2,}$/, '\n');

    // attacklab: add sentinel to emulate \z
    listStr += '¨0';

    var rgx = /(\n)?(^ {0,3})([*+-]|\d+[.])[ \t]+((\[(x|X| )?])?[ \t]*[^\r]+?(\n{1,2}))(?=\n*(¨0| {0,3}([*+-]|\d+[.])[ \t]+))/gm,
        isParagraphed = (/\n[ \t]*\n(?!¨0)/.test(listStr));

    // Since version 1.5, nesting sublists requires 4 spaces (or 1 tab) indentation,
    // which is a syntax breaking change
    // activating this option reverts to old behavior
    if (options.disableForced4SpacesIndentedSublists) {
      rgx = /(\n)?(^ {0,3})([*+-]|\d+[.])[ \t]+((\[(x|X| )?])?[ \t]*[^\r]+?(\n{1,2}))(?=\n*(¨0|\2([*+-]|\d+[.])[ \t]+))/gm;
    }

    listStr = listStr.replace(rgx, function (wholeMatch, m1, m2, m3, m4, taskbtn, checked) {
      checked = (checked && checked.trim() !== '');

      var item = showdown.subParser('outdent')(m4, options, globals),
          bulletStyle = '';

      // Support for github tasklists
      if (taskbtn && options.tasklists) {
        bulletStyle = ' class="task-list-item" style="list-style-type: none;"';
        item = item.replace(/^[ \t]*\[(x|X| )?]/m, function () {
          var otp = '<input type="checkbox" disabled style="margin: 0px 0.35em 0.25em -1.6em; vertical-align: middle;"';
          if (checked) {
            otp += ' checked';
          }
          otp += '>';
          return otp;
        });
      }

      // ISSUE #312
      // This input: - - - a
      // causes trouble to the parser, since it interprets it as:
      // <ul><li><li><li>a</li></li></li></ul>
      // instead of:
      // <ul><li>- - a</li></ul>
      // So, to prevent it, we will put a marker (¨A)in the beginning of the line
      // Kind of hackish/monkey patching, but seems more effective than overcomplicating the list parser
      item = item.replace(/^([-*+]|\d\.)[ \t]+[\S\n ]*/g, function (wm2) {
        return '¨A' + wm2;
      });

      // m1 - Leading line or
      // Has a double return (multi paragraph) or
      // Has sublist
      if (m1 || (item.search(/\n{2,}/) > -1)) {
        item = showdown.subParser('githubCodeBlocks')(item, options, globals);
        item = showdown.subParser('blockGamut')(item, options, globals);
      } else {
        // Recursion for sub-lists:
        item = showdown.subParser('lists')(item, options, globals);
        item = item.replace(/\n$/, ''); // chomp(item)
        item = showdown.subParser('hashHTMLBlocks')(item, options, globals);
        // Colapse double linebreaks
        item = item.replace(/\n\n+/g, '\n\n');
        // replace double linebreaks with a placeholder
        item = item.replace(/\n\n/g, '¨B');
        if (isParagraphed) {
          item = showdown.subParser('paragraphs')(item, options, globals);
        } else {
          item = showdown.subParser('spanGamut')(item, options, globals);
        }
        item = item.replace(/¨B/g, '\n\n');
      }

      // now we need to remove the marker (¨A)
      item = item.replace('¨A', '');
      // we can finally wrap the line in list item tags
      item =  '<li' + bulletStyle + '>' + item + '</li>\n';

      return item;
    });

    // attacklab: strip sentinel
    listStr = listStr.replace(/¨0/g, '');

    globals.gListLevel--;

    if (trimTrailing) {
      listStr = listStr.replace(/\s+$/, '');
    }

    return listStr;
  }

  /**
   * Check and parse consecutive lists (better fix for issue #142)
   * @param {string} list
   * @param {string} listType
   * @param {boolean} trimTrailing
   * @returns {string}
   */
  function parseConsecutiveLists (list, listType, trimTrailing) {
    // check if we caught 2 or more consecutive lists by mistake
    // we use the counterRgx, meaning if listType is UL we look for OL and vice versa
    var olRgx = (options.disableForced4SpacesIndentedSublists) ? /^ ?\d+\.[ \t]/gm : /^ {0,3}\d+\.[ \t]/gm,
        ulRgx = (options.disableForced4SpacesIndentedSublists) ? /^ ?[*+-][ \t]/gm : /^ {0,3}[*+-][ \t]/gm,
        counterRxg = (listType === 'ul') ? olRgx : ulRgx,
        result = '';

    if (list.search(counterRxg) !== -1) {
      (function parseCL (txt) {
        var pos = txt.search(counterRxg);
        if (pos !== -1) {
          // slice
          result += '\n<' + listType + '>\n' + processListItems(txt.slice(0, pos), !!trimTrailing) + '</' + listType + '>\n';

          // invert counterType and listType
          listType = (listType === 'ul') ? 'ol' : 'ul';
          counterRxg = (listType === 'ul') ? olRgx : ulRgx;

          //recurse
          parseCL(txt.slice(pos));
        } else {
          result += '\n<' + listType + '>\n' + processListItems(txt, !!trimTrailing) + '</' + listType + '>\n';
        }
      })(list);
    } else {
      result = '\n<' + listType + '>\n' + processListItems(list, !!trimTrailing) + '</' + listType + '>\n';
    }

    return result;
  }

  // add sentinel to hack around khtml/safari bug:
  // http://bugs.webkit.org/show_bug.cgi?id=11231
  text += '¨0';

  if (globals.gListLevel) {
    text = text.replace(/^(( {0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(¨0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm,
      function (wholeMatch, list, m2) {
        var listType = (m2.search(/[*+-]/g) > -1) ? 'ul' : 'ol';
        return parseConsecutiveLists(list, listType, true);
      }
    );
  } else {
    text = text.replace(/(\n\n|^\n?)(( {0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(¨0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm,
      function (wholeMatch, m1, list, m3) {
        var listType = (m3.search(/[*+-]/g) > -1) ? 'ul' : 'ol';
        return parseConsecutiveLists(list, listType, false);
      }
    );
  }

  // strip sentinel
  text = text.replace(/¨0/, '');
  text = globals.converter._dispatch('lists.after', text, options, globals);
  return text;
});

/**
 * Remove one level of line-leading tabs or spaces
 */
showdown.subParser('outdent', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('outdent.before', text, options, globals);

  // attacklab: hack around Konqueror 3.5.4 bug:
  // "----------bug".replace(/^-/g,"") == "bug"
  text = text.replace(/^(\t|[ ]{1,4})/gm, '¨0'); // attacklab: g_tab_width

  // attacklab: clean up hack
  text = text.replace(/¨0/g, '');

  text = globals.converter._dispatch('outdent.after', text, options, globals);
  return text;
});

/**
 *
 */
showdown.subParser('paragraphs', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('paragraphs.before', text, options, globals);
  // Strip leading and trailing lines:
  text = text.replace(/^\n+/g, '');
  text = text.replace(/\n+$/g, '');

  var grafs = text.split(/\n{2,}/g),
      grafsOut = [],
      end = grafs.length; // Wrap <p> tags

  for (var i = 0; i < end; i++) {
    var str = grafs[i];
    // if this is an HTML marker, copy it
    if (str.search(/¨(K|G)(\d+)\1/g) >= 0) {
      grafsOut.push(str);

    // test for presence of characters to prevent empty lines being parsed
    // as paragraphs (resulting in undesired extra empty paragraphs)
    } else if (str.search(/\S/) >= 0) {
      str = showdown.subParser('spanGamut')(str, options, globals);
      str = str.replace(/^([ \t]*)/g, '<p>');
      str += '</p>';
      grafsOut.push(str);
    }
  }

  /** Unhashify HTML blocks */
  end = grafsOut.length;
  for (i = 0; i < end; i++) {
    var blockText = '',
        grafsOutIt = grafsOut[i],
        codeFlag = false;
    // if this is a marker for an html block...
    // use RegExp.test instead of string.search because of QML bug
    while (/¨(K|G)(\d+)\1/.test(grafsOutIt)) {
      var delim = RegExp.$1,
          num   = RegExp.$2;

      if (delim === 'K') {
        blockText = globals.gHtmlBlocks[num];
      } else {
        // we need to check if ghBlock is a false positive
        if (codeFlag) {
          // use encoded version of all text
          blockText = showdown.subParser('encodeCode')(globals.ghCodeBlocks[num].text, options, globals);
        } else {
          blockText = globals.ghCodeBlocks[num].codeblock;
        }
      }
      blockText = blockText.replace(/\$/g, '$$$$'); // Escape any dollar signs

      grafsOutIt = grafsOutIt.replace(/(\n\n)?¨(K|G)\d+\2(\n\n)?/, blockText);
      // Check if grafsOutIt is a pre->code
      if (/^<pre\b[^>]*>\s*<code\b[^>]*>/.test(grafsOutIt)) {
        codeFlag = true;
      }
    }
    grafsOut[i] = grafsOutIt;
  }
  text = grafsOut.join('\n');
  // Strip leading and trailing lines:
  text = text.replace(/^\n+/g, '');
  text = text.replace(/\n+$/g, '');
  return globals.converter._dispatch('paragraphs.after', text, options, globals);
});

/**
 * Run extension
 */
showdown.subParser('runExtension', function (ext, text, options, globals) {
  'use strict';

  if (ext.filter) {
    text = ext.filter(text, globals.converter, options);

  } else if (ext.regex) {
    // TODO remove this when old extension loading mechanism is deprecated
    var re = ext.regex;
    if (!(re instanceof RegExp)) {
      re = new RegExp(re, 'g');
    }
    text = text.replace(re, ext.replace);
  }

  return text;
});

/**
 * These are all the transformations that occur *within* block-level
 * tags like paragraphs, headers, and list items.
 */
showdown.subParser('spanGamut', function (text, options, globals) {
  'use strict';

  text = globals.converter._dispatch('spanGamut.before', text, options, globals);
  text = showdown.subParser('codeSpans')(text, options, globals);
  text = showdown.subParser('escapeSpecialCharsWithinTagAttributes')(text, options, globals);
  text = showdown.subParser('encodeBackslashEscapes')(text, options, globals);

  // Process anchor and image tags. Images must come first,
  // because ![foo][f] looks like an anchor.
  text = showdown.subParser('images')(text, options, globals);
  text = showdown.subParser('anchors')(text, options, globals);

  // Make links out of things like `<http://example.com/>`
  // Must come after _DoAnchors(), because you can use < and >
  // delimiters in inline links like [this](<url>).
  text = showdown.subParser('autoLinks')(text, options, globals);
  text = showdown.subParser('italicsAndBold')(text, options, globals);
  text = showdown.subParser('strikethrough')(text, options, globals);

  // we need to hash HTML tags inside spans
  text = showdown.subParser('hashHTMLSpans')(text, options, globals);

  // now we encode amps and angles
  text = showdown.subParser('encodeAmpsAndAngles')(text, options, globals);

  // Do hard breaks
  if (options.simpleLineBreaks) {
    // GFM style hard breaks
    text = text.replace(/\n/g, '<br />\n');
  } else {
    // Vanilla hard breaks
    text = text.replace(/  +\n/g, '<br />\n');
  }

  text = globals.converter._dispatch('spanGamut.after', text, options, globals);
  return text;
});

showdown.subParser('strikethrough', function (text, options, globals) {
  'use strict';

  if (options.strikethrough) {
    text = globals.converter._dispatch('strikethrough.before', text, options, globals);
    text = text.replace(/(?:~){2}([\s\S]+?)(?:~){2}/g, '<del>$1</del>');
    text = globals.converter._dispatch('strikethrough.after', text, options, globals);
  }

  return text;
});

/**
 * Strips link definitions from text, stores the URLs and titles in
 * hash references.
 * Link defs are in the form: ^[id]: url "optional title"
 */
showdown.subParser('stripLinkDefinitions', function (text, options, globals) {
  'use strict';

  var regex = /^ {0,3}\[(.+)]:[ \t]*\n?[ \t]*<?(\S+?)>?(?: =([*\d]+[A-Za-z%]{0,4})x([*\d]+[A-Za-z%]{0,4}))?[ \t]*\n?[ \t]*(?:(\n*)["|'(](.+?)["|')][ \t]*)?(?:\n+|(?=¨0))/gm;

  // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
  text += '¨0';

  text = text.replace(regex, function (wholeMatch, linkId, url, width, height, blankLines, title) {
    linkId = linkId.toLowerCase();
    globals.gUrls[linkId] = showdown.subParser('encodeAmpsAndAngles')(url, options, globals);  // Link IDs are case-insensitive

    if (blankLines) {
      // Oops, found blank lines, so it's not a title.
      // Put back the parenthetical statement we stole.
      return blankLines + title;

    } else {
      if (title) {
        globals.gTitles[linkId] = title.replace(/"|'/g, '&quot;');
      }
      if (options.parseImgDimensions && width && height) {
        globals.gDimensions[linkId] = {
          width:  width,
          height: height
        };
      }
    }
    // Completely remove the definition from the text
    return '';
  });

  // attacklab: strip sentinel
  text = text.replace(/¨0/, '');

  return text;
});

showdown.subParser('tables', function (text, options, globals) {
  'use strict';

  if (!options.tables) {
    return text;
  }

  var tableRgx = /^ {0,3}\|?.+\|.+\n[ \t]{0,3}\|?[ \t]*:?[ \t]*(?:-|=){2,}[ \t]*:?[ \t]*\|[ \t]*:?[ \t]*(?:-|=){2,}[\s\S]+?(?:\n\n|¨0)/gm;

  function parseStyles (sLine) {
    if (/^:[ \t]*--*$/.test(sLine)) {
      return ' style="text-align:left;"';
    } else if (/^--*[ \t]*:[ \t]*$/.test(sLine)) {
      return ' style="text-align:right;"';
    } else if (/^:[ \t]*--*[ \t]*:$/.test(sLine)) {
      return ' style="text-align:center;"';
    } else {
      return '';
    }
  }

  function parseHeaders (header, style) {
    var id = '';
    header = header.trim();
    if (options.tableHeaderId) {
      id = ' id="' + header.replace(/ /g, '_').toLowerCase() + '"';
    }
    header = showdown.subParser('spanGamut')(header, options, globals);

    return '<th' + id + style + '>' + header + '</th>\n';
  }

  function parseCells (cell, style) {
    var subText = showdown.subParser('spanGamut')(cell, options, globals);
    return '<td' + style + '>' + subText + '</td>\n';
  }

  function buildTable (headers, cells) {
    var tb = '<table>\n<thead>\n<tr>\n',
        tblLgn = headers.length;

    for (var i = 0; i < tblLgn; ++i) {
      tb += headers[i];
    }
    tb += '</tr>\n</thead>\n<tbody>\n';

    for (i = 0; i < cells.length; ++i) {
      tb += '<tr>\n';
      for (var ii = 0; ii < tblLgn; ++ii) {
        tb += cells[i][ii];
      }
      tb += '</tr>\n';
    }
    tb += '</tbody>\n</table>\n';
    return tb;
  }

  text = globals.converter._dispatch('tables.before', text, options, globals);

  text = text.replace(tableRgx, function (rawTable) {

    var i, tableLines = rawTable.split('\n');

    // strip wrong first and last column if wrapped tables are used
    for (i = 0; i < tableLines.length; ++i) {
      if (/^ {0,3}\|/.test(tableLines[i])) {
        tableLines[i] = tableLines[i].replace(/^ {0,3}\|/, '');
      }
      if (/\|[ \t]*$/.test(tableLines[i])) {
        tableLines[i] = tableLines[i].replace(/\|[ \t]*$/, '');
      }
    }

    var rawHeaders = tableLines[0].split('|').map(function (s) { return s.trim();}),
        rawStyles = tableLines[1].split('|').map(function (s) { return s.trim();}),
        rawCells = [],
        headers = [],
        styles = [],
        cells = [];

    tableLines.shift();
    tableLines.shift();

    for (i = 0; i < tableLines.length; ++i) {
      if (tableLines[i].trim() === '') {
        continue;
      }
      rawCells.push(
        tableLines[i]
          .split('|')
          .map(function (s) {
            return s.trim();
          })
      );
    }

    if (rawHeaders.length < rawStyles.length) {
      return rawTable;
    }

    for (i = 0; i < rawStyles.length; ++i) {
      styles.push(parseStyles(rawStyles[i]));
    }

    for (i = 0; i < rawHeaders.length; ++i) {
      if (showdown.helper.isUndefined(styles[i])) {
        styles[i] = '';
      }
      headers.push(parseHeaders(rawHeaders[i], styles[i]));
    }

    for (i = 0; i < rawCells.length; ++i) {
      var row = [];
      for (var ii = 0; ii < headers.length; ++ii) {
        if (showdown.helper.isUndefined(rawCells[i][ii])) {

        }
        row.push(parseCells(rawCells[i][ii], styles[ii]));
      }
      cells.push(row);
    }

    return buildTable(headers, cells);
  });

  text = globals.converter._dispatch('tables.after', text, options, globals);

  return text;
});

/**
 * Swap back in all the special characters we've hidden.
 */
showdown.subParser('unescapeSpecialChars', function (text, options, globals) {
  'use strict';
  text = globals.converter._dispatch('unescapeSpecialChars.before', text, options, globals);

  text = text.replace(/¨E(\d+)E/g, function (wholeMatch, m1) {
    var charCodeToReplace = parseInt(m1);
    return String.fromCharCode(charCodeToReplace);
  });

  text = globals.converter._dispatch('unescapeSpecialChars.after', text, options, globals);
  return text;
});

var root = this;

// CommonJS/nodeJS Loader
if (typeof module !== 'undefined' && module.exports) {
  module.exports = showdown;

// AMD Loader
} else if (typeof define === 'function' && define.amd) {
  define(function () {
    'use strict';
    return showdown;
  });

// Regular Browser loader
} else {
  root.showdown = showdown;
}
}).call(this);

//# sourceMappingURL=showdown.js.map