showdown/dist/showdown.js

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

function getDefaultOpts(simple) {
  'use strict';

  var defaultOptions = {
    omitExtraWLInCodeBlocks: {
      default: false,
      describe: 'Omit the default extra whiteline added to code blocks',
      type: 'boolean'
    },
    noHeaderId: {
      default: false,
      describe: 'Turn on/off generated header id',
      type: 'boolean'
    },
    prefixHeaderId: {
      default: false,
      describe: 'Specify a prefix to generated header ids',
      type: 'string'
    },
    headerLevelStart: {
      default: false,
      describe: 'The header blocks level start',
      type: 'integer'
    },
    parseImgDimensions: {
      default: false,
      describe: 'Turn on/off image dimension parsing',
      type: 'boolean'
    },
    simplifiedAutoLink: {
      default: false,
      describe: 'Turn on/off GFM autolink style',
      type: 'boolean'
    },
    literalMidWordUnderscores: {
      default: false,
      describe: 'Parse midword underscores as literal underscores',
      type: 'boolean'
    },
    strikethrough: {
      default: false,
      describe: 'Turn on/off strikethrough support',
      type: 'boolean'
    },
    tables: {
      default: false,
      describe: 'Turn on/off tables support',
      type: 'boolean'
    },
    tablesHeaderId: {
      default: false,
      describe: 'Add an id to table headers',
      type: 'boolean'
    },
    ghCodeBlocks: {
      default: true,
      describe: 'Turn on/off GFM fenced code blocks support',
      type: 'boolean'
    },
    tasklists: {
      default: false,
      describe: 'Turn on/off GFM tasklist support',
      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].default;
    }
  }
  return ret;
}

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

// Private properties
var showdown = {},
    parsers = {},
    extensions = {},
    globalOptions = getDefaultOpts(true),
    flavor = {
      github: {
        omitExtraWLInCodeBlocks:   true,
        prefixHeaderId:            'user-content-',
        simplifiedAutoLink:        true,
        literalMidWordUnderscores: true,
        strikethrough:             true,
        tables:                    true,
        tablesHeaderId:            true,
        ghCodeBlocks:              true,
        tasklists:                 true
      },
      vanilla: getDefaultOpts(true)
    };

/**
 * 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)) {
    var preset = flavor[name];
    for (var option in preset) {
      if (preset.hasOwnProperty(option)) {
        globalOptions[option] = preset[option];
      }
    }
  }
};

/**
 * 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') {
      ret.valid = false;
      ret.error = baseMsg + 'type ' + type + ' is not recognized. Valid values: "lang" or "output"';
      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;
      }

    } else {
      ret.valid = false;
      ret.error = baseMsg + 'extensions must define either a "regex" property or a "filter" method';
      return ret;
    }

    if (showdown.helper.isUndefined(ext.filter) && showdown.helper.isUndefined(ext.regex)) {
      ret.valid = false;
      ret.error = baseMsg + 'output extensions must define a filter property';
      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 isString(a) {
  'use strict';
  return (typeof a === 'string' || a instanceof String);
};

/**
 * ForEach helper function
 * @static
 * @param {*} obj
 * @param {function} callback
 */
showdown.helper.forEach = function forEach(obj, callback) {
  'use strict';
  if (typeof obj.forEach === 'function') {
    obj.forEach(callback);
  } else {
    for (var i = 0; i < obj.length; i++) {
      callback(obj[i], i, obj);
    }
  }
};

/**
 * isArray helper function
 * @static
 * @param {*} a
 * @returns {boolean}
 */
showdown.helper.isArray = function isArray(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 isUndefined(value) {
  'use strict';
  return typeof value === 'undefined';
};

/**
 * Standardidize extension name
 * @static
 * @param {string} s extension name
 * @returns {string}
 */
showdown.helper.stdExtName = function (s) {
  'use strict';
  return s.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 escapeCharacters(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;
};

/**
 * POLYFILLS
 */
if (showdown.helper.isUndefined(console)) {
  console = {
    warn: function (msg) {
      'use strict';
      alert(msg);
    },
    log: function (msg) {
      'use strict';
      alert(msg);
    }
  };
}

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

/**
 * Showdown Converter class
 * @class
 * @param {object} [converterOptions]
 * @returns {
 *  {makeHtml: Function},
 *  {setOption: Function},
 *  {getOption: Function},
 *  {getOptions: Function}
 * }
 */
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 = [],

      /**
       * The parser Order
       * @private
       * @type {string[]}
       */
      parserOrder = [
        'githubCodeBlocks',
        'hashHTMLBlocks',
        'stripLinkDefinitions',
        'blockGamut',
        'unescapeSpecialChars'
      ];

  _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;

        default:
          // should never reach here
          throw Error('Extension loader error: Type unrecognized!!!');
      }
    }
  }

  /**
   * 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!!!');
      }
    }
  }

  /**
   * 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:     [],
      gUrls:           {},
      gTitles:         {},
      gDimensions:     {},
      gListLevel:      0,
      hashLinkCounts:  {},
      langExtensions:  langExtensions,
      outputModifiers: outputModifiers,
      converter:       this
    };

    // attacklab: Replace ~ with ~T
    // This lets us use tilde 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');

    // attacklab: 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

    // 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);

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

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

    // Run all registered parsers
    for (var i = 0; i < parserOrder.length; ++i) {
      var name = parserOrder[i];
      text = parsers[name](text, options, globals);
    }

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

    // attacklab: Restore tildes
    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)) {
      var preset = flavor[name];
      for (var option in preset) {
        if (preset.hasOwnProperty(option)) {
          options[option] = preset[option];
        }
      }
    }
  };

  /**
   * 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, config, globals) {
  'use strict';

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

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

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

    return result;
  };

  // First, handle reference-style links: [link text] [id]
  /*
   text = text.replace(/
   (							// wrap whole match in $1
   \[
   (
   (?:
   \[[^\]]*\]		// allow brackets nested one level
   |
   [^\[]			// or anything else
   )*
   )
   \]

   [ ]?					// one optional space
   (?:\n[ ]*)?				// one optional newline followed by spaces

   \[
   (.*?)					// id = $3
   \]
   )()()()()					// pad remaining backreferences
   /g,_DoAnchors_callback);
   */
  text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag);

  //
  // Next, inline-style links: [link text](url "optional title")
  //

  /*
   text = text.replace(/
   (						// wrap whole match in $1
   \[
   (
   (?:
   \[[^\]]*\]	// allow brackets nested one level
   |
   [^\[\]]			// or anything else
   )
   )
   \]
   \(						// literal paren
   [ \t]*
   ()						// no id, so leave $3 empty
   <?(.*?)>?				// href = $4
   [ \t]*
   (						// $5
   (['"])				// quote char = $6
   (.*?)				// Title = $7
   \6					// matching quote
   [ \t]*				// ignore any spaces/tabs between closing quote and )
   )?						// title is optional
   \)
   )
   /g,writeAnchorTag);
   */
  text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,
                      writeAnchorTag);

  //
  // Last, 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(/
   (                // wrap whole match in $1
   \[
   ([^\[\]]+)       // link text = $2; can't contain '[' or ']'
   \]
   )()()()()()      // pad rest of backreferences
   /g, writeAnchorTag);
   */
  text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);

  return text;

});

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

  //simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[-.+~:?#@!$&'()*,;=[\]\w]+)\b/gi,

  var simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[^'">\s]+\.[^'">\s]+)(?=\s|$)(?!["<>])/gi,
      delimUrlRegex   = /<(((https?|ftp|dict):\/\/|www\.)[^'">\s]+)>/gi,
      simpleMailRegex = /\b(?:mailto:)?([-.\w]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)\b/gi,
      delimMailRegex  = /<(?:mailto:)?([-.\w]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi;

  text = text.replace(delimUrlRegex, '<a href=\"$1\">$1</a>');
  text = text.replace(delimMailRegex, replaceMail);
  //simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[-.+~:?#@!$&'()*,;=[\]\w]+)\b/gi,
  // Email addresses: <address@domain.foo>

  if (options.simplifiedAutoLink) {
    text = text.replace(simpleURLRegex, '<a href=\"$1\">$1</a>');
    text = text.replace(simpleMailRegex, '<a href=\"$1\">$1</a>');
  }

  function replaceMail(wholeMatch, m1) {
    var unescapedStr = showdown.subParser('unescapeSpecialChars')(m1);
    return showdown.subParser('encodeEmailAddress')(unescapedStr);
  }

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

  // Do Horizontal Rules:
  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 = showdown.subParser('tables')(text, options, globals);
  text = showdown.subParser('lists')(text, options, globals);
  text = showdown.subParser('codeBlocks')(text, options, globals);
  text = showdown.subParser('blockQuotes')(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);

  return text;

});

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

  /*
   text = text.replace(/
   (								// Wrap whole match in $1
   (
   ^[ \t]*>[ \t]?			// '>' at the start of a line
   .+\n					// rest of the first line
   (.+\n)*					// subsequent consecutive lines
   \n*						// blanks
   )+
   )
   /gm, function(){...});
   */

  text = text.replace(/((^[ \t]*>[ \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('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);
  });
  return text;
});

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

  /*
   text = text.replace(text,
   /(?:\n\n|^)
   (								// $1 = the code block -- one or more lines, starting with a space/tab
   (?:
   (?:[ ]{4}|\t)			// Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
   .*\n+
   )+
   )
   (\n*[ ]{0,3}[^ \t\n]|(?=~0))	// attacklab: g_tab_width
   /g,function(){...});
   */

  // attacklab: 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);
    codeblock = showdown.subParser('encodeCode')(codeblock);
    codeblock = showdown.subParser('detab')(codeblock);
    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;
  });

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

  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) {
  'use strict';

  /*
   text = text.replace(/
   (^|[^\\])					// Character before opening ` can't be a backslash
   (`+)						// $2 = Opening run of `
   (							// $3 = The code block
   [^\r]*?
   [^`]					// attacklab: work around lack of lookbehind
   )
   \2							// Matching closer
   (?!`)
   /gm, function(){...});
   */

  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);
    return m1 + '<code>' + c + '</code>';
  });

  return text;

});

/**
 * Convert all tabs to spaces
 */
showdown.subParser('detab', function (text) {
  'use strict';

  // 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, '');

  return text;

});

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

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

  // 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:
  text = text.replace(/</g, '&lt;');
  text = text.replace(/>/g, '&gt;');

  // Now, escape characters that are magic in Markdown:
  text = showdown.helper.escapeCharacters(text, '*_{}[]\\', false);

  // jj the line above breaks this:
  //---
  //* Item
  //   1. Subitem
  //            special char: *
  // ---

  return text;
});

/**
 *  Input: an email address, e.g. "foo@example.com"
 *
 *  Output: the email address as a mailto link, with each character
 *    of the address encoded as either a decimal or hex entity, in
 *    the hopes of foiling most address harvesting spam bots. E.g.:
 *
 *    <a href="&#x6D;&#97;&#105;&#108;&#x74;&#111;:&#102;&#111;&#111;&#64;&#101;
 *       x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;">&#102;&#111;&#111;
 *       &#64;&#101;x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;</a>
 *
 *  Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
 *  mailing list: <http://tinyurl.com/yu7ue>
 *
 */
showdown.subParser('encodeEmailAddress', function (addr) {
  'use strict';

  var encode = [
    function (ch) {
      return '&#' + ch.charCodeAt(0) + ';';
    },
    function (ch) {
      return '&#x' + ch.charCodeAt(0).toString(16) + ';';
    },
    function (ch) {
      return ch;
    }
  ];

  addr = 'mailto:' + addr;

  addr = addr.replace(/./g, function (ch) {
    if (ch === '@') {
      // this *must* be encoded. I insist.
      ch = encode[Math.floor(Math.random() * 2)](ch);
    } else if (ch !== ':') {
      // leave ':' alone (to spot mailto: later)
      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;
  });

  addr = '<a href="' + addr + '">' + addr + '</a>';
  addr = addr.replace(/">.+:/g, '">'); // strip the mailto: from the visible part

  return addr;
});

/**
 * 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) {
  'use strict';

  // 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) {
    var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, '$1`');
    tag = showdown.helper.escapeCharacters(tag, '\\`*_', false);
    return tag;
  });

  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 += '~0';

  text = text.replace(/(?:^|\n)```(.*)\n([\s\S]*?)\n```/g, function (wholeMatch, m1, m2) {
    var language = m1,
        codeblock = m2,
        end = '\n';

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

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

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

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

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

  return text;

});

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

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';

  // attacklab: Double up blank lines to reduce lookaround
  text = text.replace(/\n/g, '\n\n');

  // Hashify HTML blocks:
  // We only want to do this for block-level HTML tags, such as headers,
  // lists, and tables. That's because we still want to wrap <p>s around
  // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
  // phrase emphasis, and spans. The list of tags we're looking for is
  // hard-coded:
  //var block_tags_a =
  // 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del|style|section|header|footer|nav|article|aside';
  // var block_tags_b =
  // 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside';

  // First, look for nested blocks, e.g.:
  //   <div>
  //     <div>
  //     tags for inner block must be indented.
  //     </div>
  //   </div>
  //
  // The outermost tags must start at the left margin for this to match, and
  // the inner nested divs must be indented.
  // We need to do this before the next, more liberal match, because the next
  // match will start at the first `<div>` and stop at the first `</div>`.

  // attacklab: This regex can be expensive when it fails.
  /*
   var text = text.replace(/
   (						// save in $1
   ^					// start of line  (with /m)
   <($block_tags_a)	// start tag = $2
   \b					// word break
   // attacklab: hack around khtml/pcre bug...
   [^\r]*?\n			// any number of lines, minimally matching
   </\2>				// the matching end tag
   [ \t]*				// trailing spaces/tabs
   (?=\n+)				// followed by a newline
   )						// attacklab: there are sentinel newlines at end of document
   /gm,function(){...}};
   */
  text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,
                      showdown.subParser('hashElement')(text, options, globals));

  //
  // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
  //

  /*
   var text = text.replace(/
   (						// save in $1
   ^					// start of line  (with /m)
   <($block_tags_b)	// start tag = $2
   \b					// word break
   // attacklab: hack around khtml/pcre bug...
   [^\r]*?				// any number of lines, minimally matching
   </\2>				// the matching end tag
   [ \t]*				// trailing spaces/tabs
   (?=\n+)				// followed by a newline
   )						// attacklab: there are sentinel newlines at end of document
   /gm,function(){...}};
   */
  text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside|address|audio|canvas|figure|hgroup|output|video)\b[^\r]*?<\/\2>[ \t]*(?=\n+)\n)/gm,
                      showdown.subParser('hashElement')(text, options, globals));

  // Special case just for <hr />. It was easier to make a special case than
  // to make the other regex more complicated.

  /*
   text = text.replace(/
   (						// save in $1
   \n\n				// Starting after a blank line
   [ ]{0,3}
   (<(hr)				// start tag = $2
   \b					// word break
   ([^<>])*?			//
   \/?>)				// the matching end tag
   [ \t]*
   (?=\n{2,})			// followed by a blank line
   )
   /g,showdown.subParser('hashElement')(text, options, globals));
   */
  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 = text.replace(/
   (						// save in $1
   \n\n				// Starting after a blank line
   [ ]{0,3}			// attacklab: g_tab_width - 1
   <!
   (--[^\r]*?--\s*)+
   >
   [ \t]*
   (?=\n{2,})			// followed by a blank line
   )
   /g,showdown.subParser('hashElement')(text, options, globals));
   */
  text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,
                      showdown.subParser('hashElement')(text, options, globals));

  // PHP and ASP-style processor instructions (<?...?> and <%...%>)

  /*
   text = text.replace(/
   (?:
   \n\n				// Starting after a blank line
   )
   (						// save in $1
   [ ]{0,3}			// attacklab: g_tab_width - 1
   (?:
   <([?%])			// $2
   [^\r]*?
   \2>
   )
   [ \t]*
   (?=\n{2,})			// followed by a blank line
   )
   /g,showdown.subParser('hashElement')(text, options, globals));
   */
  text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,
                      showdown.subParser('hashElement')(text, options, globals));

  // attacklab: Undo double lines (see comment at top of this function)
  text = text.replace(/\n\n/g, '\n');
  return text;

});

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

  var prefixHeader = options.prefixHeaderId,
      headerLevelStart = (isNaN(parseInt(options.headerLevelStart))) ? 1 : parseInt(options.headerLevelStart);

  // Set text-style headers:
  //	Header 1
  //	========
  //
  //	Header 2
  //	--------
  //
  text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm, 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(/^(.+)[ \t]*\n-+[ \t]*\n+/gm, 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
  //

  /*
   text = text.replace(/
   ^(\#{1,6})				// $1 = string of #'s
   [ \t]*
   (.+?)					// $2 = Header text
   [ \t]*
   \#*						// optional closing #'s (not counted)
   \n+
   /gm, function() {...});
   */

  text = text.replace(/^(#{1,6})[ \t]*(.+?)[ \t]*#*\n+/gm, 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, escapedId = m.replace(/[^\w]/g, '').toLowerCase();

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

    // Prefix id to prevent causing inadvertent pre-existing style matches.
    if (prefixHeader === true) {
      prefixHeader = 'section';
    }

    if (showdown.helper.isString(prefixHeader)) {
      return prefixHeader + title;
    }
    return title;
  }

  return text;
});

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

  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;');
    url = showdown.helper.escapeCharacters(url, '*_', false);
    var result = '<img src="' + url + '" alt="' + altText + '"';

    if (title) {
      title = title.replace(/"/g, '&quot;');
      title = showdown.helper.escapeCharacters(title, '*_', false);
      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);

  return text;
});

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

  if (options.literalMidWordUnderscores) {
    //underscores
    // Since we are consuming a \s character, we need to add it
    text = text.replace(/(\s)__(?=\S)([^]+?)__(?=\s)/g, '$1<strong>$2</strong>');
    text = text.replace(/(\s)_(?=\S)([^]+?)_(?=\s)/g, '$1<em>$2</em>');
    //asterisks
    text = text.replace(/\*\*(?=\S)([^]+?)\*\*/g, '<strong>$1</strong>');
    text = text.replace(/\*(?=\S)([^]+?)\*/g, '<em>$1</em>');

  } else {
    // <strong> must go first:
    text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g, '<strong>$2</strong>');
    text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g, '<em>$2</em>');
  }
  return text;
});

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

  var spl = '~1';

  /**
   * Process the contents of a single ordered or unordered list, splitting it
   * into individual list items.
   * @param {string} listStr
   * @returns {string}
   */
  function processListItems (listStr) {
    // 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)?(^[ \t]*)([*+-]|\d+[.])[ \t]+((\[(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);

      //m1 - LeadingLine
      if (m1 || (item.search(/\n{2,}/) > -1)) {
        item = showdown.subParser('blockGamut')(item, options, globals);
      } else {
        if (taskbtn && options.tasklists) {
          item = item.replace(taskbtn, 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;
          });
        }

        // Recursion for sub-lists:
        item = showdown.subParser('lists')(item, options, globals);
        item = item.replace(/\n$/, ''); // chomp(item)
        item = showdown.subParser('spanGamut')(item, options, globals);
      }

      // this is a "hack" to differentiate between ordered and unordered lists
      // related to issue #142
      var tp = (m3.search(/[*+-]/g) > -1) ? 'ul' : 'ol',
        bulletStyle = '';

      if (taskbtn) {
        bulletStyle = ' class="task-list-item" style="list-style-type: none;"';
      }

      return spl + tp + '<li' + bulletStyle + '>' + item + '</li>\n';
    });

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

    globals.gListLevel--;
    return listStr;
  }

  /**
   * Slit consecutive ol/ul lists (related to issue 142)
   * @param {Array} results
   * @param {string} listType
   * @returns {string|*}
   */
  function splitConsecutiveLists (results, listType) {
    // parsing html with regex...
    // This will surely fail if some extension decides to change paragraph markup directly
    var cthulhu = /(<p[^>]+?>|<p>|<\/p>)/img,
        holder = [[]],
        res = '',
        y = 0;

    // Initialize first sublist
    holder[0].type = listType;

    for (var i = 0; i < results.length; ++i) {
      var txt = results[i].slice(2),
          nListType = results[i].slice(0, 2);

      if (listType !== nListType) {
        y++;
        holder[y] = [];
        holder[y].type = nListType;
        listType = nListType;
      }
      holder[y].push(txt);
    }
    for (i = 0; i < holder.length; ++i) {
      res += '<' + holder[i].type + '>\n';
      for (var ii = 0; ii < holder[i].length; ++ii) {
        if (holder[i].length > 1 && ii === holder[i].length - 1 && !cthulhu.test(holder[i][ii - 1])) {
          //holder[i][ii] = holder[i][ii].replace(cthulhu, '');
        }
        res += holder[i][ii];
      }
      res += '</' + holder[i].type + '>\n';
    }
    return res;
  }

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

  // Re-usable pattern to match any entire ul or ol list:
  var wholeList = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;

  if (globals.gListLevel) {
    text = text.replace(wholeList, function (wholeMatch, m1, m2) {
      var listType = (m2.search(/[*+-]/g) > -1) ? 'ul' : 'ol',
          result = processListItems(m1);

      // Turn double returns into triple returns, so that we can make a
      // paragraph for the last item in a list, if necessary:
      //list = list.replace(/\n{2,}/g, '\n\n\n');
      //result = processListItems(list);

      // Trim any trailing whitespace, to put the closing `</$list_type>`
      // up on the preceding line, to get it past the current stupid
      // HTML block parser. This is a hack to work around the terrible
      // hack that is the HTML block parser.
      result = result.replace(/\s+$/, '');
      var splRes = result.split(spl);
      splRes.shift();
      result = splitConsecutiveLists(splRes, listType);
      return result;
    });
  } else {
    wholeList = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
    //wholeList = /(\n\n|^\n?)( {0,3}([*+-]|\d+\.)[ \t]+[\s\S]+?)(?=(~0)|(\n\n(?!\t| {2,}| {0,3}([*+-]|\d+\.)[ \t])))/g;

    text = text.replace(wholeList, function (wholeMatch, m1, m2, m3) {

      // Turn double returns into triple returns, so that we can make a
      // paragraph for the last item in a list, if necessary:
      var list = m2.replace(/\n{2,}/g, '\n\n\n'),
      //var list = (m2.slice(-2) !== '~0') ? m2 + '\n' : m2, //add a newline after the list
          listType = (m3.search(/[*+-]/g) > -1) ? 'ul' : 'ol',
          result = processListItems(list),
          splRes = result.split(spl);

      splRes.shift();
      return m1 + splitConsecutiveLists(splRes, listType) + '\n';
    });
  }

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

  return text;
});

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

  // 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, '');

  return text;
});

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

  // 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(\d+)K/g) >= 0) {
      grafsOut.push(str);
    } 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++) {
    // if this is a marker for an html block...
    while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
      var blockText = globals.gHtmlBlocks[RegExp.$1];
      blockText = blockText.replace(/\$/g, '$$$$'); // Escape any dollar signs
      grafsOut[i] = grafsOut[i].replace(/~K\d+K/, blockText);
    }
  }

  return grafsOut.join('\n\n');
});

/**
 * 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 = 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('encodeAmpsAndAngles')(text, options, globals);
  text = showdown.subParser('italicsAndBold')(text, options, globals);
  text = showdown.subParser('strikethrough')(text, options, globals);

  // Do hard breaks:
  text = text.replace(/  +\n/g, ' <br />\n');

  return text;

});

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

  if (options.strikethrough) {
    text = text.replace(/(?:~T){2}([^~]+)(?:~T){2}/g, '<del>$1</del>');
  }

  return text;
});

/**
 * 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+/
 */
showdown.subParser('stripBlankLines', function (text) {
  'use strict';
  return text.replace(/^[ \t]+$/mg, '');
});

/**
 * Strips link definitions from text, stores the URLs and titles in
 * hash references.
 * Link defs are in the form: ^[id]: url "optional title"
 *
 * ^[ ]{0,3}\[(.+)\]: // id = $1  attacklab: g_tab_width - 1
 * [ \t]*
 * \n?                  // maybe *one* newline
 * [ \t]*
 * <?(\S+?)>?          // url = $2
 * [ \t]*
 * \n?                // maybe one newline
 * [ \t]*
 * (?:
 * (\n*)              // any lines skipped = $3 attacklab: lookbehind removed
 * ["(]
 * (.+?)              // title = $4
 * [")]
 * [ \t]*
 * )?                 // title is optional
 * (?:\n+|$)
 * /gm,
 * function(){...});
 *
 */
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);  // 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';

  var table = function () {

    var tables = {},
        filter;

    tables.th = function (header, style) {
      var id = '';
      header = header.trim();
      if (header === '') {
        return '';
      }
      if (options.tableHeaderId) {
        id = ' id="' + header.replace(/ /g, '_').toLowerCase() + '"';
      }
      if (style.trim() === '') {
        style = '';
      } else {
        style = ' style="' + style + '"';
      }
      return '<th' + id + style + '>' + header + '</th>';
    };

    tables.td = function (cell, style) {
      var subText = showdown.subParser('spanGamut')(cell.trim(), options, globals);
      if (style.trim() === '') {
        style = '';
      } else {
        style = ' style="' + style + '"';
      }
      return '<td' + style + '>' + subText + '</td>';
    };

    tables.ths = function () {
      var out = '',
          i = 0,
          hs = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      for (i; i < hs.length; i += 1) {
        out += tables.th(hs[i], style[i]) + '\n';
      }

      return out;
    };

    tables.tds = function () {
      var out = '',
          i = 0,
          ds = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      for (i; i < ds.length; i += 1) {
        out += tables.td(ds[i], style[i]) + '\n';
      }
      return out;
    };

    tables.thead = function () {
      var out,
          hs = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      out = '<thead>\n';
      out += '<tr>\n';
      out += tables.ths.apply(this, [hs, style]);
      out += '</tr>\n';
      out += '</thead>\n';
      return out;
    };

    tables.tr = function () {
      var out,
        cs = [].slice.apply(arguments[0]),
        style = [].slice.apply(arguments[1]);

      out = '<tr>\n';
      out += tables.tds.apply(this, [cs, style]);
      out += '</tr>\n';
      return out;
    };

    filter = function (text) {
      var i = 0,
        lines = text.split('\n'),
        line,
        hs,
        out = [];

      for (i; i < lines.length; i += 1) {
        line = lines[i];
        // looks like a table heading
        if (line.trim().match(/^[|].*[|]$/)) {
          line = line.trim();

          var tbl = [],
              align = lines[i + 1].trim(),
              styles = [],
              j = 0;

          if (align.match(/^[|][-=|: ]+[|]$/)) {
            styles = align.substring(1, align.length - 1).split('|');
            for (j = 0; j < styles.length; ++j) {
              styles[j] = styles[j].trim();
              if (styles[j].match(/^[:][-=| ]+[:]$/)) {
                styles[j] = 'text-align:center;';

              } else if (styles[j].match(/^[-=| ]+[:]$/)) {
                styles[j] = 'text-align:right;';

              } else if (styles[j].match(/^[:][-=| ]+$/)) {
                styles[j] = 'text-align:left;';
              } else {
                styles[j] = '';
              }
            }
          }
          tbl.push('<table>');
          hs = line.substring(1, line.length - 1).split('|');

          if (styles.length === 0) {
            for (j = 0; j < hs.length; ++j) {
              styles.push('text-align:left');
            }
          }
          tbl.push(tables.thead.apply(this, [hs, styles]));
          line = lines[++i];
          if (!line.trim().match(/^[|][-=|: ]+[|]$/)) {
            // not a table rolling back
            line = lines[--i];
          } else {
            line = lines[++i];
            tbl.push('<tbody>');
            while (line.trim().match(/^[|].*[|]$/)) {
              line = line.trim();
              tbl.push(tables.tr.apply(this, [line.substring(1, line.length - 1).split('|'), styles]));
              line = lines[++i];
            }
            tbl.push('</tbody>');
            tbl.push('</table>');
            // we are done with this table and we move along
            out.push(tbl.join('\n'));
            continue;
          }
        }
        out.push(line);
      }
      return out.join('\n');
    };
    return {parse: filter};
  };

  if (options.tables) {
    var tableParser = table();
    return tableParser.parse(text);
  } else {
    return text;
  }
});

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

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

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