text: //
  // showdown.js -- A javascript port of Markdown.
  //
  // Copyright (c) 2007 John Fraser.
  //
  // Original Markdown Copyright (c) 2004-2005 John Gruber
  //   <http://daringfireball.net/projects/markdown/>
  //
  // Redistributable under a BSD-style open source license.
  // See license.txt for more information.
  //
  // The full source distribution is at:
  //
  //				A A L
  //				T C A
  //				T K B
  //
  //   <http://www.attacklab.net/>
  //
  
  //
  // Wherever possible, Showdown is a straight, line-by-line port
  // of the Perl version of Markdown.
  //
  // This is not a normal parser design; it's basically just a
  // series of string substitutions.  It's hard to read and
  // maintain this way,  but keeping Showdown close to the original
  // design makes it easier to port new features.
  //
  // More importantly, Showdown behaves like markdown.pl in most
  // edge cases.  So web applications can do client-side preview
  // in Javascript, and then build identical HTML on the server.
  //
  // This port needs the new RegExp functionality of ECMA 262,
  // 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
  // should do fine.  Even with the new regular expression features,
  // We do a lot of work to emulate Perl's regex functionality.
  // The tricky changes in this file mostly have the "attacklab:"
  // label.  Major or self-explanatory changes don't.
  //
  // Smart diff tools like Araxis Merge will be able to match up
  // this file with markdown.pl in a useful way.  A little tweaking
  // helps: in a copy of markdown.pl, replace "#" with "//" and
  // replace "$text" with "text".  Be sure to ignore whitespace
  // and line endings.
  //
  
  
  //
  // Showdown usage:
  //
  //   var text = "Markdown *rocks*.";
  //
  //   var converter = new Showdown.converter();
  //   var html = converter.makeHtml(text);
  //
  //   alert(html);
  //
  // Note: move the sample code to the bottom of this
  // file before uncommenting it.
  //
  
  
  //
  // Showdown namespace
  //
  var Showdown = {};
  
  //
  // converter
  //
  // Wraps all "globals" so that the only thing
  // exposed is makeHtml().
  //
  Showdown.converter = function() {
  
  //
  // Globals:
  //
  
  // Global hashes, used by various utility routines
      var g_urls;
      var g_titles;
      var g_html_blocks;
  
  // Used to track when we're inside an ordered or unordered list
  // (see _ProcessListItems() for details):
      var g_list_level = 0;
  
  
      this.makeHtml = function(text) {
  //
  // Main function. The order in which other subs are called here is
  // essential. Link and image substitutions need to happen before
  // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
  // and <img> tags get encoded.
  //
  
          // Clear the global hashes. If we don't clear these, you get conflicts
          // from other articles when generating a page which contains more than
          // one article (e.g. an index page that shows the N most recent
          // articles):
          g_urls = new Array();
          g_titles = new Array();
          g_html_blocks = new Array();
  
          // attacklab: Replace ~ with ~T
          // This lets us use tilde as an escape char to avoid md5 hashes
          // The choice of character is arbitray; 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";
  
          // Convert all tabs to spaces.
          text = _Detab(text);
  
          // Strip any lines consisting only of spaces and tabs.
          // This makes subsequent regexen easier to write, because we can
          // match consecutive blank lines with /\n+/ instead of something
          // contorted like /[ \t]*\n+/ .
          text = text.replace(/^[ \t]+$/mg,"");
  
          // Turn block-level HTML blocks into hash entries
          text = _HashHTMLBlocks(text);
  
          // Strip link definitions, store in hashes.
          text = _StripLinkDefinitions(text);
  
          text = _RunBlockGamut(text);
  
          text = _UnescapeSpecialChars(text);
  
          // attacklab: Restore dollar signs
          text = text.replace(/~D/g,"$$");
  
          // attacklab: Restore tildes
          text = text.replace(/~T/g,"~");
  
          return text;
      }
  
  
      var _StripLinkDefinitions = function(text) {
  //
  // Strips link definitions from text, stores the URLs and titles in
  // hash references.
  //
  
          // Link defs are in the form: ^[id]: url "optional title"
  
          /*
           var text = text.replace(/
           ^[ ]{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(){...});
           */
          var text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|\Z)/gm,
              function (wholeMatch,m1,m2,m3,m4) {
                  m1 = m1.toLowerCase();
                  g_urls[m1] = _EncodeAmpsAndAngles(m2);  // Link IDs are case-insensitive
                  if (m3) {
                      // Oops, found blank lines, so it's not a title.
                      // Put back the parenthetical statement we stole.
                      return m3+m4;
                  } else if (m4) {
                      g_titles[m1] = m4.replace(/"/g,"&quot;");
                  }
  
                  // Completely remove the definition from the text
                  return "";
              }
          );
  
          return text;
      }
  
  
      var _HashHTMLBlocks = function(text) {
          // 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"
          var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
  
          // 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,hashElement);
  
          //
          // 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)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);
  
          // 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,hashElement);
           */
          text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement);
  
          // 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,hashElement);
           */
          text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement);
  
          // 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,hashElement);
           */
          text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement);
  
          // attacklab: Undo double lines (see comment at top of this function)
          text = text.replace(/\n\n/g,"\n");
          return text;
      }
  
      var hashElement = 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" + (g_html_blocks.push(blockText)-1) + "K\n\n";
  
          return blockText;
      };
  
      var _RunBlockGamut = function(text) {
  //
  // These are all the transformations that form block-level
  // tags like paragraphs, headers, and list items.
  //
          text = _DoHeaders(text);
  
          // Do Horizontal Rules:
          var key = hashBlock("<hr />");
          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 = _DoLists(text);
          text = _DoCodeBlocks(text);
          text = _DoBlockQuotes(text);
  
          // 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 = _HashHTMLBlocks(text);
          text = _FormParagraphs(text);
  
          return text;
      }
  
  
      var _RunSpanGamut = function(text) {
  //
  // These are all the transformations that occur *within* block-level
  // tags like paragraphs, headers, and list items.
  //
  
          text = _DoCodeSpans(text);
          text = _EscapeSpecialCharsWithinTagAttributes(text);
          text = _EncodeBackslashEscapes(text);
  
          // Process anchor and image tags. Images must come first,
          // because ![foo][f] looks like an anchor.
          text = _DoImages(text);
          text = _DoAnchors(text);
  
          // 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 = _DoAutoLinks(text);
          text = _EncodeAmpsAndAngles(text);
          text = _DoItalicsAndBold(text);
  
          // Do hard breaks:
          text = text.replace(/  +\n/g," <br />\n");
  
          return text;
      }
  
      var _EscapeSpecialCharsWithinTagAttributes = function(text) {
  //
  // Within tags -- meaning between < and > -- encode [\ ` * _] so they
  // don't conflict with their use in Markdown for code, italics and strong.
  //
  
          // 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 = escapeCharacters(tag,"\\`*_");
              return tag;
          });
  
          return text;
      }
  
      var _DoAnchors = function(text) {
  //
  // Turn Markdown link shortcuts into XHTML <a> tags.
  //
          //
          // 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;
      }
  
      var writeAnchorTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
          if (m7 == undefined) m7 = "";
          var whole_match = m1;
          var link_text   = m2;
          var link_id	 = m3.toLowerCase();
          var url		= m4;
          var title	= m7;
  
          if (url == "") {
              if (link_id == "") {
                  // lower-case and turn embedded newlines into spaces
                  link_id = link_text.toLowerCase().replace(/ ?\n/g," ");
              }
              url = "#"+link_id;
  
              if (g_urls[link_id] != undefined) {
                  url = g_urls[link_id];
                  if (g_titles[link_id] != undefined) {
                      title = g_titles[link_id];
                  }
              }
              else {
                  if (whole_match.search(/\(\s*\)$/m)>-1) {
                      // Special case for explicit empty url
                      url = "";
                  } else {
                      return whole_match;
                  }
              }
          }
  
          url = escapeCharacters(url,"*_");
          var result = "<a href=\"" + url + "\"";
  
          if (title != "") {
              title = title.replace(/"/g,"&quot;");
              title = escapeCharacters(title,"*_");
              result +=  " title=\"" + title + "\"";
          }
  
          result += ">" + link_text + "</a>";
  
          return result;
      }
  
  
      var _DoImages = function(text) {
  //
  // Turn Markdown image shortcuts into <img> tags.
  //
  
          //
          // First, handle reference-style labeled images: ![alt text][id]
          //
  
          /*
           text = text.replace(/
           (						// wrap whole match in $1
           !\[
           (.*?)				// alt text = $2
           \]
  
           [ ]?				// one optional space
           (?:\n[ ]*)?			// one optional newline followed by spaces
  
           \[
           (.*?)				// id = $3
           \]
           )()()()()				// pad rest of backreferences
           /g,writeImageTag);
           */
          text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeImageTag);
  
          //
          // Next, handle inline images:  ![alt text](url "optional title")
          // Don't forget: encode * and _
  
          /*
           text = text.replace(/
           (						// wrap whole match in $1
           !\[
           (.*?)				// alt text = $2
           \]
           \s?					// One optional whitespace character
           \(					// literal paren
           [ \t]*
           ()					// no id, so leave $3 empty
           <?(\S+?)>?			// src url = $4
           [ \t]*
           (					// $5
           (['"])			// quote char = $6
           (.*?)			// title = $7
           \6				// matching quote
           [ \t]*
           )?					// title is optional
           \)
           )
           /g,writeImageTag);
           */
          text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeImageTag);
  
          return text;
      }
  
      var writeImageTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
          var whole_match = m1;
          var alt_text   = m2;
          var link_id	 = m3.toLowerCase();
          var url		= m4;
          var title	= m7;
  
          if (!title) title = "";
  
          if (url == "") {
              if (link_id == "") {
                  // lower-case and turn embedded newlines into spaces
                  link_id = alt_text.toLowerCase().replace(/ ?\n/g," ");
              }
              url = "#"+link_id;
  
              if (g_urls[link_id] != undefined) {
                  url = g_urls[link_id];
                  if (g_titles[link_id] != undefined) {
                      title = g_titles[link_id];
                  }
              }
              else {
                  return whole_match;
              }
          }
  
          alt_text = alt_text.replace(/"/g,"&quot;");
          url = escapeCharacters(url,"*_");
          var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
  
          // attacklab: Markdown.pl adds empty title attributes to images.
          // Replicate this bug.
  
          //if (title != "") {
          title = title.replace(/"/g,"&quot;");
          title = escapeCharacters(title,"*_");
          result +=  " title=\"" + title + "\"";
          //}
  
          result += " />";
  
          return result;
      }
  
  
      var _DoHeaders = function(text) {
  
          // Setext-style headers:
          //	Header 1
          //	========
          //
          //	Header 2
          //	--------
          //
          text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
              function(wholeMatch,m1){return hashBlock("<h1>" + _RunSpanGamut(m1) + "</h1>");});
  
          text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
              function(matchFound,m1){return hashBlock("<h2>" + _RunSpanGamut(m1) + "</h2>");});
  
          // 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 h_level = m1.length;
                  return hashBlock("<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">");
              });
  
          return text;
      }
  
  // This declaration keeps Dojo compressor from outputting garbage:
      var _ProcessListItems;
  
      var _DoLists = function(text) {
  //
  // Form HTML ordered (numbered) and unordered (bulleted) lists.
  //
  
          // 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 entirel ul or ol list:
  
          /*
           var whole_list = /
           (									// $1 = whole list
           (								// $2
           [ ]{0,3}					// attacklab: g_tab_width - 1
           ([*+-]|\d+[.])				// $3 = first list item marker
           [ \t]+
           )
           [^\r]+?
           (								// $4
           ~0							// sentinel for workaround; should be $
           |
           \n{2,}
           (?=\S)
           (?!							// Negative lookahead for another list item marker
           [ \t]*
           (?:[*+-]|\d+[.])[ \t]+
           )
           )
           )/g
           */
          var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
  
          if (g_list_level) {
              text = text.replace(whole_list,function(wholeMatch,m1,m2) {
                  var list = m1;
                  var list_type = (m2.search(/[*+-]/g)>-1) ? "ul" : "ol";
  
                  // 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");;
                  var result = _ProcessListItems(list);
  
                  // Trim any trailing whitespace, to put the closing `</$list_type>`
                  // up on the preceding line, to get it past the current stupid
                  // HTML block parser. This is a hack to work around the terrible
                  // hack that is the HTML block parser.
                  result = result.replace(/\s+$/,"");
                  result = "<"+list_type+">" + result + "</"+list_type+">\n";
                  return result;
              });
          } else {
              whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
              text = text.replace(whole_list,function(wholeMatch,m1,m2,m3) {
                  var runup = m1;
                  var list = m2;
  
                  var list_type = (m3.search(/[*+-]/g)>-1) ? "ul" : "ol";
                  // Turn double returns into triple returns, so that we can make a
                  // paragraph for the last item in a list, if necessary:
                  var list = list.replace(/\n{2,}/g,"\n\n\n");;
                  var result = _ProcessListItems(list);
                  result = runup + "<"+list_type+">\n" + result + "</"+list_type+">\n";
                  return result;
              });
          }
  
          // attacklab: strip sentinel
          text = text.replace(/~0/,"");
  
          return text;
      }
  
      _ProcessListItems = function(list_str) {
  //
  //  Process the contents of a single ordered or unordered list, splitting it
  //  into individual list items.
  //
          // 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.".
  
          g_list_level++;
  
          // trim trailing blank lines:
          list_str = list_str.replace(/\n{2,}$/,"\n");
  
          // attacklab: add sentinel to emulate \z
          list_str += "~0";
  
          /*
           list_str = list_str.replace(/
           (\n)?							// leading line = $1
           (^[ \t]*)						// leading whitespace = $2
           ([*+-]|\d+[.]) [ \t]+			// list marker = $3
           ([^\r]+?						// list item text   = $4
           (\n{1,2}))
           (?= \n* (~0 | \2 ([*+-]|\d+[.]) [ \t]+))
           /gm, function(){...});
           */
          list_str = list_str.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,
              function(wholeMatch,m1,m2,m3,m4){
                  var item = m4;
                  var leading_line = m1;
                  var leading_space = m2;
  
                  if (leading_line || (item.search(/\n{2,}/)>-1)) {
                      item = _RunBlockGamut(_Outdent(item));
                  }
                  else {
                      // Recursion for sub-lists:
                      item = _DoLists(_Outdent(item));
                      item = item.replace(/\n$/,""); // chomp(item)
                      item = _RunSpanGamut(item);
                  }
  
                  return  "<li>" + item + "</li>\n";
              }
          );
  
          // attacklab: strip sentinel
          list_str = list_str.replace(/~0/g,"");
  
          g_list_level--;
          return list_str;
      }
  
  
      var _DoCodeBlocks = function(text) {
  //
  //  Process Markdown `<pre><code>` blocks.
  //
  
          /*
           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";
  
          text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
              function(wholeMatch,m1,m2) {
                  var codeblock = m1;
                  var nextChar = m2;
  
                  codeblock = _EncodeCode( _Outdent(codeblock));
                  codeblock = _Detab(codeblock);
                  codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
                  codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace
  
                  codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
  
                  return hashBlock(codeblock) + nextChar;
              }
          );
  
          // attacklab: strip sentinel
          text = text.replace(/~0/,"");
  
          return text;
      }
  
      var hashBlock = function(text) {
          text = text.replace(/(^\n+|\n+$)/g,"");
          return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n";
      }
  
  
      var _DoCodeSpans = function(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> ...
  //
  
          /*
           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,m4) {
                  var c = m3;
                  c = c.replace(/^([ \t]*)/g,"");	// leading whitespace
                  c = c.replace(/[ \t]*$/g,"");	// trailing whitespace
                  c = _EncodeCode(c);
                  return m1+"<code>"+c+"</code>";
              });
  
          return text;
      }
  
  
      var _EncodeCode = function(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.
  //
          // 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 = escapeCharacters(text,"\*_{}[]\\",false);
  
  // jj the line above breaks this:
  //---
  
  //* Item
  
  //   1. Subitem
  
  //            special char: *
  //---
  
          return text;
      }
  
  
      var _DoItalicsAndBold = function(text) {
  
          // <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;
      }
  
  
      var _DoBlockQuotes = function(text) {
  
          /*
           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 = _RunBlockGamut(bq);				// 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 hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
              });
          return text;
      }
  
  
      var _FormParagraphs = function(text) {
  //
  //  Params:
  //    $text - string to process with html <p> tags
  //
  
          // Strip leading and trailing lines:
          text = text.replace(/^\n+/g,"");
          text = text.replace(/\n+$/g,"");
  
          var grafs = text.split(/\n{2,}/g);
          var grafsOut = new Array();
  
          //
          // Wrap <p> tags.
          //
          var end = grafs.length;
          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 = _RunSpanGamut(str);
                  str = str.replace(/^([ \t]*)/g,"<p>");
                  str += "</p>"
                  grafsOut.push(str);
              }
  
          }
  
          //
          // Unhashify HTML blocks
          //
          end = grafsOut.length;
          for (var i=0; i<end; i++) {
              // if this is a marker for an html block...
              while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
                  var blockText = g_html_blocks[RegExp.$1];
                  blockText = blockText.replace(/\$/g,"$$$$"); // Escape any dollar signs
                  grafsOut[i] = grafsOut[i].replace(/~K\d+K/,blockText);
              }
          }
  
          return grafsOut.join("\n\n");
      }
  
  
      var _EncodeAmpsAndAngles = function(text) {
  // Smart processing for ampersands and angle brackets that need to be encoded.
  
          // 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;
      }
  
  
      var _EncodeBackslashEscapes = function(text) {
  //
  //   Parameter:  String.
  //   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.
  
          text = text.replace(/\\(\\)/g,escapeCharacters_callback);
          text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g,escapeCharacters_callback);
          return text;
      }
  
  
      var _DoAutoLinks = function(text) {
  
          text = text.replace(/<((https?|ftp|dict):[^'">\s]+)>/gi,"<a href=\"$1\">$1</a>");
  
          // Email addresses: <address@domain.foo>
  
          /*
           text = text.replace(/
           <
           (?:mailto:)?
           (
           [-.\w]+
           \@
           [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
           )
           >
           /gi, _DoAutoLinks_callback());
           */
          text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
              function(wholeMatch,m1) {
                  return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
              }
          );
  
          return text;
      }
  
  
      var _EncodeEmailAddress = function(addr) {
  //
  //  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>
  //
  
          // attacklab: why can't javascript speak hex?
          function char2hex(ch) {
              var hexDigits = '0123456789ABCDEF';
              var dec = ch.charCodeAt(0);
              return(hexDigits.charAt(dec>>4) + hexDigits.charAt(dec&15));
          }
  
          var encode = [
              function(ch){return "&#"+ch.charCodeAt(0)+";";},
              function(ch){return "&#x"+char2hex(ch)+";";},
              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 > .9  ?	encode[2](ch)   :
                          r > .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;
      }
  
  
      var _UnescapeSpecialChars = function(text) {
  //
  // Swap back in all the special characters we've hidden.
  //
          text = text.replace(/~E(\d+)E/g,
              function(wholeMatch,m1) {
                  var charCodeToReplace = parseInt(m1);
                  return String.fromCharCode(charCodeToReplace);
              }
          );
          return text;
      }
  
  
      var _Outdent = function(text) {
  //
  // Remove one level of line-leading tabs or spaces
  //
  
          // 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;
      }
  
      var _Detab = function(text) {
  // attacklab: Detab's completely rewritten for speed.
  // In perl we could fix it by anchoring the regexp with \G.
  // In javascript we're less fortunate.
  
          // expand first n-1 tabs
          text = text.replace(/\t(?=\t)/g,"    "); // attacklab: 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,m2) {
                  var leadingText = m1;
                  var numSpaces = 4 - leadingText.length % 4;  // attacklab: 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,"    ");  // attacklab: g_tab_width
          text = text.replace(/~B/g,"");
  
          return text;
      }
  
  
  //
  //  attacklab: Utility functions
  //
  
  
      var escapeCharacters = function(text, charsToEscape, afterBackslash) {
          // 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,escapeCharacters_callback);
  
          return text;
      }
  
  
      var escapeCharacters_callback = function(wholeMatch,m1) {
          var charCodeToEscape = m1.charCodeAt(0);
          return "~E"+charCodeToEscape+"E";
      }
  
  } // end of Showdown.converter
  