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01_markdown-converter.js
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01_markdown-converter.js
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			"use strict";
			var Markdown;

			if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module
			Markdown = exports;
			else
			Markdown = {};

			// The following text is included for historical reasons, but should
			// be taken with a pinch of salt; it's not all true anymore.

			//
			// 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.
			//


			//
			// Usage:
			//
			// var text = "Markdown rocks.";
			//
			// var converter = new Markdown.Converter();
			// var html = converter.makeHtml(text);
			//
			// alert(html);
			//
			// Note: move the sample code to the bottom of this
			// file before uncommenting it.
			//

			(function () {

			function identity(x) { return x; }
			function returnFalse(x) { return false; }

			function HookCollection() { }

			HookCollection.prototype = {

			chain: function (hookname, func) {
			var original = this[hookname];
			if (!original)
			throw new Error("unknown hook " + hookname);

			if (original === identity)
			this[hookname] = func;
			else
			this[hookname] = function (text) {
			var args = Array.prototype.slice.call(arguments, 0);
			args[0] = original.apply(null, args);
			return func.apply(null, args);
			};
			},
			set: function (hookname, func) {
			if (!this[hookname])
			throw new Error("unknown hook " + hookname);
			this[hookname] = func;
			},
			addNoop: function (hookname) {
			this[hookname] = identity;
			},
			addFalse: function (hookname) {
			this[hookname] = returnFalse;
			}
			};

			Markdown.HookCollection = HookCollection;

			// 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.stackexchange.com/questions/64655/strange-wmd-bug
			// (granted, switching from Array() to Object() alone would have left only __proto__
			// to be a problem)
			function SaveHash() { }
			SaveHash.prototype = {
			set: function (key, value) {
			this["s_" + key] = value;
			},
			get: function (key) {
			return this["s_" + key];
			}
			};

			Markdown.Converter = function (OPTIONS) {
			var pluginHooks = this.hooks = new HookCollection();

			// given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link
			pluginHooks.addNoop("plainLinkText");

			// called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked
			pluginHooks.addNoop("preConversion");

			// called with the text once all normalizations have been completed (tabs to spaces, line endings, etc.), but before any conversions have
			pluginHooks.addNoop("postNormalization");

			// Called with the text before / after creating block elements like code blocks and lists. Note that this is called recursively
			// with inner content, e.g. it's called with the full text, and then only with the content of a blockquote. The inner
			// call will receive outdented text.
			pluginHooks.addNoop("preBlockGamut");
			pluginHooks.addNoop("postBlockGamut");

			// called with the text of a single block element before / after the span-level conversions (bold, code spans, etc.) have been made
			pluginHooks.addNoop("preSpanGamut");
			pluginHooks.addNoop("postSpanGamut");

			// called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml
			pluginHooks.addNoop("postConversion");

			//
			// Private state of the converter instance:
			//

			// 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;

			OPTIONS = OPTIONS \|\| {};
			var asciify = identity, deasciify = identity;
			if (OPTIONS.nonAsciiLetters) {

			/* In JavaScript regular expressions, \w only denotes [a-zA-Z0-9_].
			* That's why there's inconsistent handling e.g. with intra-word bolding
			* of Japanese words. That's why we do the following if OPTIONS.nonAsciiLetters
			* is true:
			*
			* Before doing bold and italics, we find every instance
			* of a unicode word character in the Markdown source that is not
			* matched by \w, and the letter "Q". We take the character's code point
			* and encode it in base 51, using the "digits"
			*
			* A, B, ..., P, R, ..., Y, Z, a, b, ..., y, z
			*
			* delimiting it with "Q" on both sides. For example, the source
			*
			* > In Chinese, the smurfs are called 藍精靈, meaning "blue spirits".
			*
			* turns into
			*
			* > In Chinese, the smurfs are called QNIhQQMOIQQOuUQ, meaning "blue spirits".
			*
			* Since everything that is a letter in Unicode is now a letter (or
			* several letters) in ASCII, \w and \b should always do the right thing.
			*
			* After the bold/italic conversion, we decode again; since "Q" was encoded
			* alongside all non-ascii characters (as "QBfQ"), and the conversion
			* will not generate "Q", the only instances of that letter should be our
			* encoded characters. And since the conversion will not break words, the
			* "Q...Q" should all still be in one piece.
			*
			* We're using "Q" as the delimiter because it's probably one of the
			* rarest characters, and also because I can't think of any special behavior
			* that would ever be triggered by this letter (to use a silly example, if we
			* delimited with "H" on the left and "P" on the right, then "Ψ" would be
			* encoded as "HTTP", which may cause special behavior). The latter would not
			* actually be a huge issue for bold/italic, but may be if we later use it
			* in other places as well.
			* */
			(function () {
			var lettersThatJavaScriptDoesNotKnowAndQ = /[Q\u00aa\u00b5\u00ba\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376-\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0523\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0621-\u064a\u0660-\u0669\u066e-\u066f\u0671-\u06d3\u06d5\u06e5-\u06e6\u06ee-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07c0-\u07ea\u07f4-\u07f5\u07fa\u0904-\u0939\u093d\u0950\u0958-\u0961\u0966-\u096f\u0971-\u0972\u097b-\u097f\u0985-\u098c\u098f-\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc-\u09dd\u09df-\u09e1\u09e6-\u09f1\u0a05-\u0a0a\u0a0f-\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32-\u0a33\u0a35-\u0a36\u0a38-\u0a39\u0a59-\u0a5c\u0a5e\u0a66-\u0a6f\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2-\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0-\u0ae1\u0ae6-\u0aef\u0b05-\u0b0c\u0b0f-\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32-\u0b33\u0b35-\u0b39\u0b3d\u0b5c-\u0b5d\u0b5f-\u0b61\u0b66-\u0b6f\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99-\u0b9a\u0b9c\u0b9e-\u0b9f\u0ba3-\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0be6-\u0bef\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58-\u0c59\u0c60-\u0c61\u0c66-\u0c6f\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0-\u0ce1\u0ce6-\u0cef\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d28\u0d2a-\u0d39\u0d3d\u0d60-\u0d61\u0d66-\u0d6f\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32-\u0e33\u0e40-\u0e46\u0e50-\u0e59\u0e81-\u0e82\u0e84\u0e87-\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa-\u0eab\u0ead-\u0eb0\u0eb2-\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0ed0-\u0ed9\u0edc-\u0edd\u0f00\u0f20-\u0f29\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8b\u1000-\u102a\u103f-\u1049\u1050-\u1055\u105a-\u105d\u1061\u1065-\u1066\u106e-\u1070\u1075-\u1081\u108e\u1090-\u1099\u10a0-\u10c5\u10d0-\u10fa\u10fc\u1100-\u1159\u115f-\u11a2\u11a8-\u11f9\u1200-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u1676\u1681-\u169a\u16a0-\u16ea\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u17e0-\u17e9\u1810-\u1819\u1820-\u1877\u1880-\u18a8\u18aa\u1900-\u191c\u1946-\u196d\u1970-\u1974\u1980-\u19a9\u19c1-\u19c7\u19d0-\u19d9\u1a00-\u1a16\u1b05-\u1b33\u1b45-\u1b4b\u1b50-\u1b59\u1b83-\u1ba0\u1bae-\u1bb9\u1c00-\u1c23\u1c40-\u1c49\u1c4d-\u1c7d\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u203f-\u2040\u2054\u2071\u207f\u2090-\u2094\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2183-\u2184\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2c6f\u2c71-\u2c7d\u2c80-\u2ce4\u2d00-\u2d25\u2d30-\u2d65\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3006\u3031-\u3035\u303b-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31b7\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fc3\ua000-\ua48c\ua500-\ua60c\ua610-\ua62b\ua640-\ua65f\ua662-\ua66e\ua67f-\ua697\ua717-\ua71f\ua722-\ua788\ua78b-\ua78c\ua7fb-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8d0-\ua8d9\ua900-\ua925\ua930-\ua946\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa50-\uaa59\uac00-\ud7a3\uf900-\ufa2d\ufa30-\ufa6a\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40-\ufb41\ufb43-\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe33-\ufe34\ufe4d-\ufe4f\ufe70-\ufe74\ufe76-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]/g;
			var cp_Q = "Q".charCodeAt(0);
			var cp_A = "A".charCodeAt(0);
			var cp_Z = "Z".charCodeAt(0);
			var dist_Za = "a".charCodeAt(0) - cp_Z - 1;

			asciify = function(text) {
			return text.replace(lettersThatJavaScriptDoesNotKnowAndQ, function (m) {
			var c = m.charCodeAt(0);
			var s = "";
			var v;
			while (c > 0) {
			v = (c % 51) + cp_A;
			if (v >= cp_Q)
			v++;
			if (v > cp_Z)
			v += dist_Za;
			s = String.fromCharCode(v) + s;
			c = c / 51 \| 0;
			}
			return "Q" + s + "Q";
			})
			};

			deasciify = function(text) {
			return text.replace(/Q([A-PR-Za-z]{1,3})Q/g, function (m, s) {
			var c = 0;
			var v;
			for (var i = 0; i < s.length; i++) {
			v = s.charCodeAt(i);
			if (v > cp_Z)
			v -= dist_Za;
			if (v > cp_Q)
			v--;
			v -= cp_A;
			c = (c * 51) + v;
			}
			return String.fromCharCode(c);
			})
			}
			})();
			}

			var _DoItalicsAndBold = OPTIONS.asteriskIntraWordEmphasis ? _DoItalicsAndBold_AllowIntrawordWithAsterisk : _DoItalicsAndBoldStrict;

			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.
			//

			// This will only happen if makeHtml on the same converter instance is called from a plugin hook.
			// Don't do that.
			if (g_urls)
			throw new Error("Recursive call to converter.makeHtml");

			// Create the private state objects.
			g_urls = new SaveHash();
			g_titles = new SaveHash();
			g_html_blocks = [];
			g_list_level = 0;

			text = pluginHooks.preConversion(text);

			// 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, "");

			text = pluginHooks.postNormalization(text);

			// 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, "~");

			text = pluginHooks.postConversion(text);

			g_html_blocks = g_titles = g_urls = null;

			return text;
			};

			function _StripLinkDefinitions(text) {
			//
			// Strips link definitions from text, stores the URLs and titles in
			// hash references.
			//

			// Link defs are in the form: ^[id]: url "optional title"

			/*
			text = text.replace(/
			^[ ]{0,3}\[([^\[\]]+)\]: // id = $1 attacklab: g_tab_width - 1
			[ \t]*
			\n? // maybe one newline
			[ \t]*
			<?(\S+?)>? // url = $2
			(?=\s\|$) // lookahead for whitespace instead of the lookbehind removed below
			[ \t]*
			\n? // maybe one newline
			[ \t]*
			( // (potential) title = $3
			(\n*) // any lines skipped = $4 attacklab: lookbehind removed
			[ \t]+
			["(]
			(.+?) // title = $5
			[")]
			[ \t]*
			)? // title is optional
			(\n+) // subsequent newlines = $6, capturing because they must be put back if the potential title isn't an actual title
			/gm, function(){...});
			*/

			text = text.replace(/^[ ]{0,3}\[([^\[\]]+)\]:[ \t]\n?[ \t]<?(\S+?)>?(?=\s\|$)[ \t]\n?[ \t]((\n)["(](.+?)[")][ \t])?(\n+)/gm,
			function (wholeMatch, m1, m2, m3, m4, m5, m6) {
			m1 = m1.toLowerCase();
			g_urls.set(m1, _EncodeAmpsAndAngles(m2)); // Link IDs are case-insensitive
			if (m4) {
			// Oops, found blank lines, so it's not a title.
			// Put back the parenthetical statement we stole.
			return m3 + m6;
			} else if (m5) {
			g_titles.set(m1, m5.replace(/"/g, """));
			}

			// Completely remove the definition from the text
			return "";
			}
			);

			return text;
			}

			function _HashHTMLBlocks(text) {

			// 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\|math\|ins\|del"
			var block_tags_b = "p\|div\|h[1-6]\|blockquote\|pre\|table\|dl\|ol\|ul\|script\|noscript\|form\|fieldset\|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.

			/*
			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\|math\|ins\|del)\b[^\r]?\n<\/\2>[ \t](?=\n+))/gm, hashMatch);

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

			/*
			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\|math)\b[^\r]?.<\/\2>[ \t]*(?=\n+)\n)/gm, hashMatch);

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

			/*
			text = text.replace(/
			\n // Starting after a blank line
			[ ]{0,3}
			( // save in $1
			(<(hr) // start tag = $2
			\b // word break
			([^<>])*?
			\/?>) // the matching end tag
			[ \t]*
			(?=\n{2,}) // followed by a blank line
			)
			/g,hashMatch);
			*/
			text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])?\/?>)[ \t](?=\n{2,}))/g, hashMatch);

			// Special case for standalone HTML comments:

			/*
			text = text.replace(/
			\n\n // Starting after a blank line
			[ ]{0,3} // attacklab: g_tab_width - 1
			( // save in $1
			<!
			(--(?:\|(?:[^>-]\|-[^>])(?:[^-]\|-[^-])*)--) // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackexchange.com/q/95256
			>
			[ \t]*
			(?=\n{2,}) // followed by a blank line
			)
			/g,hashMatch);
			*/
			text = text.replace(/\n\n[ ]{0,3}(<!(--(?:\|(?:[^>-]\|-[^>])(?:[^-]\|-[^-]))--)>[ \t](?=\n{2,}))/g, hashMatch);

			// 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,hashMatch);
			*/
			text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]?\2>)[ \t](?=\n{2,}))/g, hashMatch);

			return text;
			}

			function hashBlock(text) {
			text = text.replace(/(^\n+\|\n+$)/g, "");
			// Replace the element text with a marker ("~KxK" where x is its key)
			return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n";
			}

			function hashMatch(wholeMatch, m1) {
			return hashBlock(m1);
			}

			var blockGamutHookCallback = function (t) { return _RunBlockGamut(t); }

			function _RunBlockGamut(text, doNotUnhash, doNotCreateParagraphs) {
			//
			// These are all the transformations that form block-level
			// tags like paragraphs, headers, and list items.
			//

			text = pluginHooks.preBlockGamut(text, blockGamutHookCallback);

			text = _DoHeaders(text);

			// Do Horizontal Rules:
			var replacement = "<hr />\n";
			text = text.replace(/^[ ]{0,2}([ ]?\[ ]?){3,}[ \t]$/gm, replacement);
			text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement);
			text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement);

			text = _DoLists(text);
			text = _DoCodeBlocks(text);
			text = _DoBlockQuotes(text);

			text = pluginHooks.postBlockGamut(text, blockGamutHookCallback);

			// 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, doNotUnhash, doNotCreateParagraphs);

			return text;
			}

			function _RunSpanGamut(text) {
			//
			// These are all the transformations that occur within block-level
			// tags like paragraphs, headers, and list items.
			//

			text = pluginHooks.preSpanGamut(text);

			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 = text.replace(/~P/g, "://"); // put in place to prevent autolinking; reset now

			text = _EncodeAmpsAndAngles(text);
			text = _DoItalicsAndBold(text);

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

			text = pluginHooks.postSpanGamut(text);

			return text;
			}

			function _EscapeSpecialCharsWithinTagAttributes(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.

			// SE: changed the comment part of the regex

			var regex = /(<[a-z\/!$]("[^"]"\|'[^']'\|[^'">])>\|<!(--(?:\|(?:[^>-]\|-[^>])(?:[^-]\|-[^-]))--)>)/gi;

			text = text.replace(regex, function (wholeMatch) {
			var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`");
			tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`_/" : "\\`_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackexchange.com/questions/95987
			return tag;
			});

			return text;
			}

			function _DoAnchors(text) {

			if (text.indexOf("[") === -1)
			return 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, writeAnchorTag);
			*/
			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
			)*
			)
			\]
			\( // literal paren
			[ \t]*
			() // no id, so leave $3 empty
			<?( // href = $4
			(?:
			$[^)]*$ // allow one level of (correctly nested) parens (think MSDN)
			\|
			[^()\s]
			)*?
			)>?
			[ \t]*
			( // $5
			(['"]) // quote char = $6
			(.*?) // Title = $7
			\6 // matching quote
			[ \t]* // ignore any spaces/tabs between closing quote and )
			)? // title is optional
			\)
			)
			/g, writeAnchorTag);
			*/

			text = text.replace(/(\[((?:\[[^\]]\]\|[^\[\]]))\]$[ \t]()<?((?:\([^)]$\|[^()\s])?)>?[ \t]((['"])(.?)\6[ \t])?\))/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;
			}

			function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
			if (m7 == undefined) m7 = "";
			var whole_match = m1;
			var link_text = m2.replace(/:\/\//g, "~P"); // to prevent auto-linking withing the link. will be converted back after the auto-linker runs
			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 = attributeSafeUrl(url);

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

			if (title != "") {
			title = attributeEncode(title);
			title = escapeCharacters(title, "*_");
			result += " title=\"" + title + "\"";
			}

			result += ">" + link_text + "</a>";

			return result;
			}

			function _DoImages(text) {

			if (text.indexOf("![") === -1)
			return 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;
			}

			function attributeEncode(text) {
			// unconditionally replace angle brackets here -- what ends up in an attribute (e.g. alt or title)
			// never makes sense to have verbatim HTML in it (and the sanitizer would totally break it)
			return text.replace(/>/g, ">").replace(/</g, "<").replace(/"/g, """).replace(/'/g, "'");
			}

			function writeImageTag(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 = escapeCharacters(attributeEncode(alt_text), "*_[]()");
			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 = attributeEncode(title);
			title = escapeCharacters(title, "*_");
			result += " title=\"" + title + "\"";
			//}

			result += " />";

			return result;
			}

			function _DoHeaders(text) {

			// Setext-style headers:
			// Header 1
			// ========
			//
			// Header 2
			// --------
			//
			text = text.replace(/^(.+)[ \t]\n=+[ \t]\n+/gm,
			function (wholeMatch, m1) { return "<h1>" + _RunSpanGamut(m1) + "</h1>\n\n"; }
			);

			text = text.replace(/^(.+)[ \t]\n-+[ \t]\n+/gm,
			function (matchFound, m1) { return "<h2>" + _RunSpanGamut(m1) + "</h2>\n\n"; }
			);

			// 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 "<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">\n\n";
			}
			);

			return text;
			}

			function _DoLists(text, isInsideParagraphlessListItem) {
			//
			// 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";
			var first_number;
			if (list_type === "ol")
			first_number = parseInt(m2, 10)

			var result = _ProcessListItems(list, list_type, isInsideParagraphlessListItem);

			// Trim any trailing whitespace, to put the closing `</$list_type>`
			// up on the preceding line, to get it past the current stupid
			// HTML block parser. This is a hack to work around the terrible
			// hack that is the HTML block parser.
			result = result.replace(/\s+$/, "");
			var opening = "<" + list_type;
			if (first_number && first_number !== 1)
			opening += " start=\"" + first_number + "\"";
			result = opening + ">" + 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";

			var first_number;
			if (list_type === "ol")
			first_number = parseInt(m3, 10)

			var result = _ProcessListItems(list, list_type);
			var opening = "<" + list_type;
			if (first_number && first_number !== 1)
			opening += " start=\"" + first_number + "\"";

			result = runup + opening + ">\n" + result + "</" + list_type + ">\n";
			return result;
			});
			}

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

			return text;
			}

			var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" };

			function _ProcessListItems(list_str, list_type, isInsideParagraphlessListItem) {
			//
			// Process the contents of a single ordered or unordered list, splitting it
			// into individual list items.
			//
			// list_type is either "ul" or "ol".

			// 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";

			// In the original attacklab showdown, list_type was not given to this function, and anything
			// that matched /[*+-]\|\d+[.]/ would just create the next <li>, causing this mismatch:
			//
			// Markdown rendered by WMD rendered by MarkdownSharp
			// ------------------------------------------------------------------
			// 1. first 1. first 1. first
			// 2. second 2. second 2. second
			// - third 3. third * third
			//
			// We changed this to behave identical to MarkdownSharp. This is the constructed RegEx,
			// with {MARKER} being one of \d+[.] or [*+-], depending on list_type:

			/*
			list_str = list_str.replace(/
			(^[ \t]*) // leading whitespace = $1
			({MARKER}) [ \t]+ // list marker = $2
			([^\r]+? // list item text = $3
			(\n+)
			)
			(?=
			(~0 \| \2 ({MARKER}) [ \t]+)
			)
			/gm, function(){...});
			*/

			var marker = _listItemMarkers[list_type];
			var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0\|\\1(" + marker + ")[ \\t]+))", "gm");
			var last_item_had_a_double_newline = false;
			list_str = list_str.replace(re,
			function (wholeMatch, m1, m2, m3) {
			var item = m3;
			var leading_space = m1;
			var ends_with_double_newline = /\n\n$/.test(item);
			var contains_double_newline = ends_with_double_newline \|\| item.search(/\n{2,}/) > -1;

			var loose = contains_double_newline \|\| last_item_had_a_double_newline;
			item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = /true, / doNotCreateParagraphs = */ !loose);

			last_item_had_a_double_newline = ends_with_double_newline;
			return "<li>" + item + "</li>\n";
			}
			);

			// attacklab: strip sentinel
			list_str = list_str.replace(/~0/g, "");

			g_list_level--;
			return list_str;
			}

			function _DoCodeBlocks(text) {
			//
			// Process Markdown `<pre><code>` blocks.
			//

			/*
			text = text.replace(/
			(?:\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\|^\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 "\n\n" + codeblock + "\n\n" + nextChar;
			}
			);

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

			return text;
			}

			function _DoCodeSpans(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 or backtick
			(`+) // $2 = Opening run of `
			(?!`) // and no more backticks -- match the full run
			( // $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);
			c = c.replace(/:\/\//g, "~P"); // to prevent auto-linking. Not necessary in code blocks, but in code spans. Will be converted back after the auto-linker runs.
			return m1 + "<code>" + c + "</code>";
			}
			);

			return text;
			}

			function _EncodeCode(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, "&");

			// Do the angle bracket song and dance:
			text = text.replace(/</g, "<");
			text = text.replace(/>/g, ">");

			// 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;
			}

			function _DoItalicsAndBoldStrict(text) {

			if (text.indexOf("*") === -1 && text.indexOf("_") === - 1)
			return text;

			text = asciify(text);

			// <strong> must go first:

			// (^\|[\W_]) Start with a non-letter or beginning of string. Store in \1.
			// (?:(?!\1)\|(?=^)) Either the next character is not the same as the previous,
			// or we started at the end of the string (in which case the previous
			// group had zero width, so we're still there). Because the next
			// character is the marker, this means that if there are e.g. multiple
			// underscores in a row, we can only match the left-most ones (which
			// prevents foo___bar__ from getting bolded)
			// (\*\|_) The marker character itself, asterisk or underscore. Store in \2.
			// \2 The marker again, since bold needs two.
			// (?=\S) The first bolded character cannot be a space.
			// ([^\r]?\S) The actual bolded string. At least one character, and it cannot end*
			// with a space either. Note that like in many other places, [^\r] is
			// just a workaround for JS' lack of single-line regexes; it's equivalent
			// to a . in an /s regex, because the string cannot contain any \r (they
			// are removed in the normalizing step).
			// \2\2 The marker character, twice -- end of bold.
			// (?!\2) Not followed by another marker character (ensuring that we match the
			// rightmost two in a longer row)...
			// (?=[\W_]\|$) ...but by any other non-word character or the end of string.
			text = text.replace(/(^\|[\W_])(?:(?!\1)\|(?=^))(\\|_)\2(?=\S)([^\r]?\S)\2\2(?!\2)(?=[\W_]\|$)/g,
			"$1<strong>$3</strong>");

			// This is almost identical to the <strong> regex, except 1) there's obviously just one marker
			// character, and 2) the italicized string cannot contain the marker character.
			text = text.replace(/(^\|[\W_])(?:(?!\1)\|(?=^))(\\|_)(?=\S)((?:(?!\2)[^\r])?\S)\2(?!\2)(?=[\W_]\|$)/g,
			"$1<em>$3</em>");

			return deasciify(text);
			}

			function _DoItalicsAndBold_AllowIntrawordWithAsterisk(text) {

			if (text.indexOf("*") === -1 && text.indexOf("_") === - 1)
			return text;

			text = asciify(text);

			// <strong> must go first:
			// (?=[^\r][_]\|[_]) Optimization only, to find potentially relevant text portions faster. Minimally slower in Chrome, but much faster in IE.
			// ( Store in \1. This is the last character before the delimiter
			// ^ Either we're at the start of the string (i.e. there is no last character)...
			// \| ... or we allow one of the following:
			// (?= (lookahead; we're not capturing this, just listing legal possibilities)
			// \W__ If the delimiter is __, then this last character must be non-word non-underscore (extra-word emphasis only)
			// \|
			// (?!\)[\W_]\\* If the delimiter is **, then this last character can be non-word non-asterisk (extra-word emphasis)...
			// \|
			// \w\\\w ...or it can be word/underscore, but only if the first bolded character is such a character as well (intra-word emphasis)
			// )
			// [^\r] actually capture the character (can't use `.` since it could be \n)
			// )
			// (\\\|__) Store in \2: the actual delimiter
			// (?!\2) not followed by the delimiter again (at most one more asterisk/underscore is allowed)
			// (?=\S) the first bolded character can't be a space
			// ( Store in \3: the bolded string
			//
			// (?:\| Look at all bolded characters except for the last one. Either that's empty, meaning only a single character was bolded...
			// [^\r]? ... otherwise take arbitrary characters, minimally matching; that's all bolded characters except for the last two*
			// (?!\2) the last two characters cannot be the delimiter itself (because that would mean four underscores/asterisks in a row)
			// [^\r] capture the next-to-last bolded character
			// )
			// (?= lookahead at the very last bolded char and what comes after
			// \S_ for underscore-bolding, it can be any non-space
			// \|
			// \w for asterisk-bolding (otherwise the previous alternative would've matched, since \w implies \S), either the last char is word/underscore...
			// \|
			// \S\\(?:[\W_]\|$) ... or it's any other non-space, but in that case the character after the delimiter may not be a word character
			// )
			// . actually capture the last character (can use `.` this time because the lookahead ensures \S in all cases)
			// )
			// (?= lookahead; list the legal possibilities for the closing delimiter and its following character
			// __(?:\W\|$) for underscore-bolding, the following character (if any) must be non-word non-underscore
			// \|
			// \\(?:[^*]\|$) for asterisk-bolding, any non-asterisk is allowed (note we already ensured above that it's not a word character if the last bolded character wasn't one)
			// )
			// \2 actually capture the closing delimiter (and make sure that it matches the opening one)

			text = text.replace(/(?=[^\r][_]\|[_])(^\|(?=\W__\|(?!\)[\W_]\\\|\w\\\w)[^\r])(\\\|__)(?!\2)(?=\S)((?:\|[^\r]?(?!\2)[^\r])(?=\S_\|\w\|\S\\(?:[\W_]\|$)).)(?=__(?:\W\|$)\|\\(?:[^*]\|$))\2/g,
			"$1<strong>$3</strong>");

			// now <em>:
			// (?=[^\r][_]\|[_]) Optimization, see above.
			// ( Store in \1. This is the last character before the delimiter
			// ^ Either we're at the start of the string (i.e. there is no last character)...
			// \| ... or we allow one of the following:
			// (?= (lookahead; we're not capturing this, just listing legal possibilities)
			// \W_ If the delimiter is _, then this last character must be non-word non-underscore (extra-word emphasis only)
			// \|
			// (?!\) otherwise, we list two possiblities for as the delimiter; in either case, the last characters cannot be an asterisk itself
			// (?:
			// [\W_]\* this last character can be non-word (extra-word emphasis)...
			// \|
			// \D\*(?=\w)\D ...or it can be word (otherwise the first alternative would've matched), but only if
			// a) the first italicized character is such a character as well (intra-word emphasis), and
			// b) neither character on either side of the asterisk is a digit
			// )
			// )
			// [^\r] actually capture the character (can't use `.` since it could be \n)
			// )
			// (\*\|_) Store in \2: the actual delimiter
			// (?!\2\2\2) not followed by more than two more instances of the delimiter
			// (?=\S) the first italicized character can't be a space
			// ( Store in \3: the italicized string
			// (?:(?!\2)[^\r])*? arbitrary characters except for the delimiter itself, minimally matching
			// (?= lookahead at the very last italicized char and what comes after
			// [^\s_]_ for underscore-italicizing, it can be any non-space non-underscore
			// \|
			// (?=\w)\D\\D for asterisk-italicizing, either the last char is word/underscore and* neither character on either side of the asterisk is a digit...
			// \|
			// [^\s]\(?:[\W_]\|$) ... or that last char is any other non-space non-asterisk, but then the character after the delimiter (if any) must be non-word
			// )
			// . actually capture the last character (can use `.` this time because the lookahead ensures \S in all cases)
			// )
			// (?= lookahead; list the legal possibilities for the closing delimiter and its following character
			// _(?:\W\|$) for underscore-italicizing, the following character (if any) must be non-word non-underscore
			// \|
			// \(?:[^]\|$) for asterisk-italicizing, any non-asterisk is allowed; all other restrictions have already been ensured in the previous lookahead
			// )
			// \2 actually capture the closing delimiter (and make sure that it matches the opening one)

			text = text.replace(/(?=[^\r][_]\|[_])(^\|(?=\W_\|(?!\)(?:[\W_]\\|\D\(?=\w)\D))[^\r])(\\|_)(?!\2\2\2)(?=\S)((?:(?!\2)[^\r])?(?=[^\s_]_\|(?=\w)\D\\D\|[^\s]\(?:[\W_]\|$)).)(?=_(?:\W\|$)\|\(?:[^]\|$))\2/g,
			"$1<em>$3</em>");

			return deasciify(text);
			}


			function _DoBlockQuotes(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;
			}

			function _FormParagraphs(text, doNotUnhash, doNotCreateParagraphs) {
			//
			// 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 = [];

			var markerRe = /~K(\d+)K/;

			//
			// 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 (markerRe.test(str)) {
			grafsOut.push(str);
			}
			else if (/\S/.test(str)) {
			str = _RunSpanGamut(str);
			str = str.replace(/^([ \t]*)/g, doNotCreateParagraphs ? "" : "<p>");
			if (!doNotCreateParagraphs)
			str += "</p>"
			grafsOut.push(str);
			}

			}
			//
			// Unhashify HTML blocks
			//
			if (!doNotUnhash) {
			end = grafsOut.length;
			for (var i = 0; i < end; i++) {
			var foundAny = true;
			while (foundAny) { // we may need several runs, since the data may be nested
			foundAny = false;
			grafsOut[i] = grafsOut[i].replace(/~K(\d+)K/g, function (wholeMatch, id) {
			foundAny = true;
			return g_html_blocks[id];
			});
			}
			}
			}
			return grafsOut.join("\n\n");
			}

			function _EncodeAmpsAndAngles(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, "&");

			// Encode naked <'s
			text = text.replace(/<(?![a-z\/?!]\|~D)/gi, "<");

			return text;
			}

			function _EncodeBackslashEscapes(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 charInsideUrl = "[-A-Z0-9+&@#/%?=~_\|[\\]()!:,.;]",
			charEndingUrl = "[-A-Z0-9+&@#/%=~_\|[\\])]",
			autoLinkRegex = new RegExp("(=\"\|<)?\\b(https?\|ftp)(://" + charInsideUrl + "*" + charEndingUrl + ")(?=$\|\\W)", "gi"),
			endCharRegex = new RegExp(charEndingUrl, "i");

			function handleTrailingParens(wholeMatch, lookbehind, protocol, link) {
			if (lookbehind)
			return wholeMatch;
			if (link.charAt(link.length - 1) !== ")")
			return "<" + protocol + link + ">";
			var parens = link.match(/[()]/g);
			var level = 0;
			for (var i = 0; i < parens.length; i++) {
			if (parens[i] === "(") {
			if (level <= 0)
			level = 1;
			else
			level++;
			}
			else {
			level--;
			}
			}
			var tail = "";
			if (level < 0) {
			var re = new RegExp("\\){1," + (-level) + "}$");
			link = link.replace(re, function (trailingParens) {
			tail = trailingParens;
			return "";
			});
			}
			if (tail) {
			var lastChar = link.charAt(link.length - 1);
			if (!endCharRegex.test(lastChar)) {
			tail = lastChar + tail;
			link = link.substr(0, link.length - 1);
			}
			}
			return "<" + protocol + link + ">" + tail;
			}

			function _DoAutoLinks(text) {

			// note that at this point, all other URL in the text are already hyperlinked as <a href=""></a>
			// except for the <http://www.foo.com> case

			// automatically add < and > around unadorned raw hyperlinks
			// must be preceded by a non-word character (and not by =" or <) and followed by non-word/EOF character
			// simulating the lookbehind in a consuming way is okay here, since a URL can neither and with a " nor
			// with a <, so there is no risk of overlapping matches.
			text = text.replace(autoLinkRegex, handleTrailingParens);

			// autolink anything like <http://example.com>


			var replacer = function (wholematch, m1) {
			var url = attributeSafeUrl(m1);

			return "<a href=\"" + url + "\">" + pluginHooks.plainLinkText(m1) + "</a>";
			};
			text = text.replace(/<((https?\|ftp):[^'">\s]+)>/gi, replacer);

			// Email addresses: <address@domain.foo>
			/*
			text = text.replace(/
			<
			(?:mailto:)?
			(
			[-.\w]+
			\@
			[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
			)
			>
			/gi, _DoAutoLinks_callback());
			*/

			/* disabling email autolinking, since we don't do that on the server, either
			text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
			function(wholeMatch,m1) {
			return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
			}
			);
			*/
			return text;
			}

			function _UnescapeSpecialChars(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;
			}

			function _Outdent(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;
			}

			function _Detab(text) {
			if (!/\t/.test(text))
			return text;

			var spaces = [" ", " ", " ", " "],
			skew = 0,
			v;

			return text.replace(/[\n\t]/g, function (match, offset) {
			if (match === "\n") {
			skew = offset + 1;
			return match;
			}
			v = (offset - skew) % 4;
			skew = offset + 1;
			return spaces[v];
			});
			}

			//
			// attacklab: Utility functions
			//

			function attributeSafeUrl(url) {
			url = attributeEncode(url);
			url = escapeCharacters(url, "*_:()[]")
			return url;
			}

			function escapeCharacters(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;
			}


			function escapeCharacters_callback(wholeMatch, m1) {
			var charCodeToEscape = m1.charCodeAt(0);
			return "~E" + charCodeToEscape + "E";
			}

			}; // end of the Markdown.Converter constructor

			})();

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