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