//
// md.js -- A javascript port of Markdown.
//
// Copyright (c) 2007 John Fraser.
//
// Original Markdown Copyright (c) 2004-2005 John Gruber
//   <http://daringfireball.net/projects/markdown/>
//
// 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 Attacklab.showdown.converter();
//   var html = converter.makeHtml(text);
//
//   alert(html);
//
// Note: move the sample code to the bottom of this
// file before uncommenting it.
//


//
// Attacklab namespace
//
var Attacklab = Attacklab || {}

//
// Showdown namespace
//
Attacklab.showdown = Attacklab.showdown || {}

//
// converter
//
// Wraps all "globals" so that the only thing
// exposed is makeHtml().
//
Attacklab.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+)/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 Attacklab.showdown.converter


// Version 0.9 used the Showdown namespace instead of Attacklab.showdown
// The old namespace is deprecated, but we'll support it for now:
var Showdown = Attacklab.showdown;

// If anyone's interested, tell the world that this file's been loaded
if (Attacklab.fileLoaded) {
	Attacklab.fileLoaded("md.js");
}
// //
// // md.js -- A javascript port of Markdown.
// //
// // Copyright (c) 2007 John Fraser.
// //
// // Original Markdown Copyright (c) 2004-2005 John Gruber
// //   <http://daringfireball.net/projects/markdown/>
// //
// // 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 Attacklab.showdown.converter();
// //   var html = converter.makeHtml(text);
// //
// //   alert(html);
// //
// // Note: move the sample code to the bottom of this
// // file before uncommenting it.
// //
// 
// 
// //
// // Attacklab namespace
// //
// var Attacklab = Attacklab || {}
// 
// //
// // Showdown namespace
// //
// Attacklab.showdown = Attacklab.showdown || {}
// 
// //
// // converter
// //
// // Wraps all "globals" so that the only thing
// // exposed is makeHtml().
// //
// Attacklab.showdown.converter = function() {
// 
// 
// // g_urls and g_titles allow arbitrary user-entered strings as keys. This
// // caused an exception (and hence stopped the rendering) when the user entered
// // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this
// // (since no builtin property starts with "s_"). See
// // http://meta.stackoverflow.com/questions/64655/strange-wmd-bug
// // (granted, switching from Array() to Object() alone would have left only __proto__
// // to be a problem)
// var SaveHash = function () {
//     this.set = function (key, value) {
//         this["s_" + key] = value;
//     }
//     this.get = function (key) {
//         return this["s_" + key];
//     }
// }
// 
// //
// // 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 SaveHash();
//     g_titles = new SaveHash();
// 	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+)/gm,
// 		function (wholeMatch,m1,m2,m3,m4) {
// 			m1 = m1.toLowerCase();
// 			g_urls.set(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.set(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.get(link_id) != undefined) {
// 			url = g_urls.get(link_id);
// 			if (g_titles.get(link_id) != undefined) {
// 				title = g_titles.get(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.get(link_id) != undefined) {
// 			url = g_urls.get(link_id);
// 			if (g_titles.get(link_id) != undefined) {
// 				title = g_titles.get(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 = "<blockquote><span>" + codeblock + "</span></blockquote>";
// 
// 			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 Attacklab.showdown.converter
// 
// 
// // Version 0.9 used the Showdown namespace instead of Attacklab.showdown
// // The old namespace is deprecated, but we'll support it for now:
// var Showdown = Attacklab.showdown;
// 
// // If anyone's interested, tell the world that this file's been loaded
// if (Attacklab.fileLoaded) {
// 	Attacklab.fileLoaded("md.js");
// }