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wmd-pl.js

Uploaded on Jan 06 2010 11:42 by marek.stoj

// This file has been edited so that polish language is supported.
// Edit by Marek (Immortal) Stój

var Attacklab = Attacklab || {};

/* begin showdown.js */

//
// showdown.js -- A javascript port of Markdown.
//
// Copyright (c) 2007 John Fraser.
//
// Original Markdown Copyright (c) 2004-2005 John Gruber
// <http://daringfireball.net/projects/markdown/>
//
// Redistributable under a BSD-style open source license.
// See license.txt for more information.
//
// The full source distribution is at:
//
// A A L
// T C A
// T K B
//
// <http://www.attacklab.net/>
//

//
// Wherever possible, Showdown is a straight, line-by-line port
// of the Perl version of Markdown.
//
// This is not a normal parser design; it's basically just a
// series of string substitutions. It's hard to read and
// maintain this way, but keeping Showdown close to the original
// design makes it easier to port new features.
//
// More importantly, Showdown behaves like markdown.pl in most
// edge cases. So web applications can do client-side preview
// in Javascript, and then build identical HTML on the server.
//
// This port needs the new RegExp functionality of ECMA 262,
// 3rd Edition (i.e. Javascript 1.5). Most modern web browsers
// should do fine. Even with the new regular expression features,
// We do a lot of work to emulate Perl's regex functionality.
// The tricky changes in this file mostly have the "attacklab:"
// label. Major or self-explanatory changes don't.
//
// Smart diff tools like Araxis Merge will be able to match up
// this file with markdown.pl in a useful way. A little tweaking
// helps: in a copy of markdown.pl, replace "#" with "//" and
// replace "$text" with "text". Be sure to ignore whitespace
// and line endings.
//


//
// Showdown usage:
//
// var text = "Markdown *rocks*.";
//
// var converter = new 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


/* begin wmd.js */

Attacklab.wmdBase = function(){

Attacklab.wmd_env = {version:1, output:"Markdown", lineLength:40, buttons:"bold italic link blockquote code image ol ul heading hr" };

// A few handy aliases for readability.
var wmd = top.Attacklab;
var doc = top.document;
var re = top.RegExp;
var nav = top.navigator;

// Some namespaces.
wmd.Util = {};
wmd.Position = {};
wmd.Command = {};
wmd.Global = {};

var util = wmd.Util;
var position = wmd.Position;
var command = wmd.Command;
var global = wmd.Global;

// Used to work around some browser bugs where we can't use feature testing.
global.isIE = /msie/.test(nav.userAgent.toLowerCase());
global.isIE_5or6 = /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase());
global.isIE_7plus = global.isIE && !global.isIE_5or6;
global.isOpera = /opera/.test(nav.userAgent.toLowerCase());
global.isKonqueror = /konqueror/.test(nav.userAgent.toLowerCase());


// -------------------------------------------------------------------
// YOUR CHANGES GO HERE
//
// I've tried to localize the things you are likely to change to
// this area.
// -------------------------------------------------------------------

// The text that appears on the upper part of the dialog box when
// entering links.
var linkDialogText = "<p><b>Insert Hyperlink</b></p><p>http://example.com/ \"optional title\"</p>";
var imageDialogText = "<p><b>Insert Image</b></p><p>http://example.com/images/diagram.jpg \"optional title\"<br><br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>";

// The default text that appears in the dialog input box when entering
// links.
var imageDefaultText = "http://";
var linkDefaultText = "http://";

// The location of your button images relative to the base directory.
var imageDirectory = "/Content/Img/";

// The link and title for the help button
var helpLink = "/editing-help";
var helpHoverTitle = "Markdown Editing Help";

// -------------------------------------------------------------------
// END OF YOUR CHANGES
// -------------------------------------------------------------------

// A collection of the important regions on the page.
// Cached so we don't have to keep traversing the DOM.
wmd.PanelCollection = function(){
this.buttonBar = doc.getElementById("wmd-button-bar");
this.preview = doc.getElementById("wmd-preview");
this.output = doc.getElementById("wmd-output");
this.input = doc.getElementById("wmd-input");
};

// This PanelCollection object can't be filled until after the page
// has loaded.
wmd.panels = undefined;

// Internet explorer has problems with CSS sprite buttons that use HTML
// lists. When you click on the background image "button", IE will
// select the non-existent link text and discard the selection in the
// textarea. The solution to this is to cache the textarea selection
// on the button's mousedown event and set a flag. In the part of the
// code where we need to grab the selection, we check for the flag
// and, if it's set, use the cached area instead of querying the
// textarea.
//
// This ONLY affects Internet Explorer (tested on versions 6, 7
// and 8) and ONLY on button clicks. Keyboard shortcuts work
// normally since the focus never leaves the textarea.
wmd.ieCachedRange = null; // cached textarea selection
wmd.ieRetardedClick = false; // flag

// Returns true if the DOM element is visible, false if it's hidden.
// Checks if display is anything other than none.
util.isVisible = function (elem) {

if (window.getComputedStyle) {
// Most browsers
return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
}
else if (elem.currentStyle) {
// IE
return elem.currentStyle["display"] !== "none";
}
};


// Adds a listener callback to a DOM element which is fired on a specified
// event.
util.addEvent = function(elem, event, listener){
if (elem.attachEvent) {
// IE only. The "on" is mandatory.
elem.attachEvent("on" + event, listener);
}
else {
// Other browsers.
elem.addEventListener(event, listener, false);
}
};


// Removes a listener callback from a DOM element which is fired on a specified
// event.
util.removeEvent = function(elem, event, listener){
if (elem.detachEvent) {
// IE only. The "on" is mandatory.
elem.detachEvent("on" + event, listener);
}
else {
// Other browsers.
elem.removeEventListener(event, listener, false);
}
};

// Converts \r\n and \r to \n.
util.fixEolChars = function(text){
text = text.replace(/\r\n/g, "\n");
text = text.replace(/\r/g, "\n");
return text;
};

// Extends a regular expression. Returns a new RegExp
// using pre + regex + post as the expression.
// Used in a few functions where we have a base
// expression and we want to pre- or append some
// conditions to it (e.g. adding "$" to the end).
// The flags are unchanged.
//
// regex is a RegExp, pre and post are strings.
util.extendRegExp = function(regex, pre, post){

if (pre === null || pre === undefined)
{
pre = "";
}
if(post === null || post === undefined)
{
post = "";
}

var pattern = regex.toString();
var flags;

// Replace the flags with empty space and store them.
pattern = pattern.replace(/\/([gim]*)$/, "");
flags = re.$1;

// Remove the slash delimiters on the regular expression.
pattern = pattern.replace(/(^\/|\/$)/g, "");
pattern = pre + pattern + post;

return new re(pattern, flags);
}


// Sets the image for a button passed to the WMD editor.
// Returns a new element with the image attached.
// Adds several style properties to the image.
util.createImage = function(img){

var imgPath = imageDirectory + img;

var elem = doc.createElement("img");
elem.className = "wmd-button";
elem.src = imgPath;

return elem;
};


// This simulates a modal dialog box and asks for the URL when you
// click the hyperlink or image buttons.
//
// text: The html for the input box.
// defaultInputText: The default value that appears in the input box.
// makeLinkMarkdown: The function which is executed when the prompt is dismissed, either via OK or Cancel
util.prompt = function(text, defaultInputText, makeLinkMarkdown){

// These variables need to be declared at this level since they are used
// in multiple functions.
var dialog; // The dialog box.
var background; // The background beind the dialog box.
var input; // The text box where you enter the hyperlink.


if (defaultInputText === undefined) {
defaultInputText = "";
}

// Used as a keydown event handler. Esc dismisses the prompt.
// Key code 27 is ESC.
var checkEscape = function(key){
var code = (key.charCode || key.keyCode);
if (code === 27) {
close(true);
}
};

// Dismisses the hyperlink input box.
// isCancel is true if we don't care about the input text.
// isCancel is false if we are going to keep the text.
var close = function(isCancel){
util.removeEvent(doc.body, "keydown", checkEscape);
var text = input.value;

if (isCancel){
text = null;
}
else{
// Fixes common pasting errors.
text = text.replace('http://http://', 'http://');
text = text.replace('http://https://', 'https://');
text = text.replace('http://ftp://', 'ftp://');

if (text.indexOf('http://') === -1 && text.indexOf('ftp://') === -1 && text.indexOf('https://') === -1) {
text = 'http://' + text;
}
}

dialog.parentNode.removeChild(dialog);
background.parentNode.removeChild(background);
makeLinkMarkdown(text);
return false;
};

// Creates the background behind the hyperlink text entry box.
// Most of this has been moved to CSS but the div creation and
// browser-specific hacks remain here.
var createBackground = function(){

background = doc.createElement("div");
background.className = "wmd-prompt-background";
style = background.style;
style.position = "absolute";
style.top = "0";

style.zIndex = "1000";

// Some versions of Konqueror don't support transparent colors
// so we make the whole window transparent.
//
// Is this necessary on modern konqueror browsers?
if (global.isKonqueror){
style.backgroundColor = "transparent";
}
else if (global.isIE){
style.filter = "alpha(opacity=50)";
}
else {
style.opacity = "0.5";
}

var pageSize = position.getPageSize();
style.height = pageSize[1] + "px";

if(global.isIE){
style.left = doc.documentElement.scrollLeft;
style.width = doc.documentElement.clientWidth;
}
else {
style.left = "0";
style.width = "100%";
}

doc.body.appendChild(background);
};

// Create the text input box form/window.
var createDialog = function(){

// The main dialog box.
dialog = doc.createElement("div");
dialog.className = "wmd-prompt-dialog";
dialog.style.padding = "10px;";
dialog.style.position = "fixed";
dialog.style.width = "400px";
dialog.style.zIndex = "1001";

// The dialog text.
var question = doc.createElement("div");
question.innerHTML = text;
question.style.padding = "5px";
dialog.appendChild(question);

// The web form container for the text box and buttons.
var form = doc.createElement("form");
form.onsubmit = function(){ return close(false); };
style = form.style;
style.padding = "0";
style.margin = "0";
style.cssFloat = "left";
style.width = "100%";
style.textAlign = "center";
style.position = "relative";
dialog.appendChild(form);

// The input text box
input = doc.createElement("input");
input.type = "text";
input.value = defaultInputText;
style = input.style;
style.display = "block";
style.width = "80%";
style.marginLeft = style.marginRight = "auto";
form.appendChild(input);

// The ok button
var okButton = doc.createElement("input");
okButton.type = "button";
okButton.onclick = function(){ return close(false); };
okButton.value = "OK";
style = okButton.style;
style.margin = "10px";
style.display = "inline";
style.width = "7em";


// The cancel button
var cancelButton = doc.createElement("input");
cancelButton.type = "button";
cancelButton.onclick = function(){ return close(true); };
cancelButton.value = "Cancel";
style = cancelButton.style;
style.margin = "10px";
style.display = "inline";
style.width = "7em";

// The order of these buttons is different on macs.
if (/mac/.test(nav.platform.toLowerCase())) {
form.appendChild(cancelButton);
form.appendChild(okButton);
}
else {
form.appendChild(okButton);
form.appendChild(cancelButton);
}

util.addEvent(doc.body, "keydown", checkEscape);
dialog.style.top = "50%";
dialog.style.left = "50%";
dialog.style.display = "block";
if(global.isIE_5or6){
dialog.style.position = "absolute";
dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
dialog.style.left = "50%";
}
doc.body.appendChild(dialog);

// This has to be done AFTER adding the dialog to the form if you
// want it to be centered.
dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";

};

createBackground();

// Why is this in a zero-length timeout?
// Is it working around a browser bug?
top.setTimeout(function(){

createDialog();

var defTextLen = defaultInputText.length;
if (input.selectionStart !== undefined) {
input.selectionStart = 0;
input.selectionEnd = defTextLen;
}
else if (input.createTextRange) {
var range = input.createTextRange();
range.collapse(false);
range.moveStart("character", -defTextLen);
range.moveEnd("character", defTextLen);
range.select();
}

input.focus();
}, 0);
};


// UNFINISHED
// The assignment in the while loop makes jslint cranky.
// I'll change it to a better loop later.
position.getTop = function(elem, isInner){
var result = elem.offsetTop;
if (!isInner) {
while (elem = elem.offsetParent) {
result += elem.offsetTop;
}
}
return result;
};

position.getHeight = function (elem) {
return elem.offsetHeight || elem.scrollHeight;
};

position.getWidth = function (elem) {
return elem.offsetWidth || elem.scrollWidth;
};

position.getPageSize = function(){

var scrollWidth, scrollHeight;
var innerWidth, innerHeight;

// It's not very clear which blocks work with which browsers.
if(self.innerHeight && self.scrollMaxY){
scrollWidth = doc.body.scrollWidth;
scrollHeight = self.innerHeight + self.scrollMaxY;
}
else if(doc.body.scrollHeight > doc.body.offsetHeight){
scrollWidth = doc.body.scrollWidth;
scrollHeight = doc.body.scrollHeight;
}
else{
scrollWidth = doc.body.offsetWidth;
scrollHeight = doc.body.offsetHeight;
}

if(self.innerHeight){
// Non-IE browser
innerWidth = self.innerWidth;
innerHeight = self.innerHeight;
}
else if(doc.documentElement && doc.documentElement.clientHeight){
// Some versions of IE (IE 6 w/ a DOCTYPE declaration)
innerWidth = doc.documentElement.clientWidth;
innerHeight = doc.documentElement.clientHeight;
}
else if(doc.body){
// Other versions of IE
innerWidth = doc.body.clientWidth;
innerHeight = doc.body.clientHeight;
}

var maxWidth = Math.max(scrollWidth, innerWidth);
var maxHeight = Math.max(scrollHeight, innerHeight);
return [maxWidth, maxHeight, innerWidth, innerHeight];
};

// Handles pushing and popping TextareaStates for undo/redo commands.
// I should rename the stack variables to list.
wmd.undoManager = function(callback){

var undoObj = this;
var undoStack = []; // A stack of undo states
var stackPtr = 0; // The index of the current state
var mode = "none";
var lastState; // The last state
var poller;
var timer; // The setTimeout handle for cancelling the timer
var inputStateObj;

// Set the mode for later logic steps.
var setMode = function(newMode, noSave){

if (mode != newMode) {
mode = newMode;
if (!noSave) {
saveState();
}
}

if (!global.isIE || mode != "moving") {
timer = top.setTimeout(refreshState, 1);
}
else {
inputStateObj = null;
}
};

var refreshState = function(){
inputStateObj = new wmd.TextareaState();
timer = undefined;
};

this.setCommandMode = function(){
mode = "command";
saveState();
timer = top.setTimeout(refreshState, 0);
};

this.canUndo = function(){
return stackPtr > 1;
};

this.canRedo = function(){
if (undoStack[stackPtr + 1]) {
return true;
}
return false;
};

// Removes the last state and restores it.
this.undo = function(){

if (undoObj.canUndo()) {
if (lastState) {
// What about setting state -1 to null or checking for undefined?
lastState.restore();
lastState = null;
}
else {
undoStack[stackPtr] = new wmd.TextareaState();
undoStack[--stackPtr].restore();

if (callback) {
callback();
}
}
}

mode = "none";
wmd.panels.input.focus();
refreshState();
};

// Redo an action.
this.redo = function(){

if (undoObj.canRedo()) {

undoStack[++stackPtr].restore();

if (callback) {
callback();
}
}

mode = "none";
wmd.panels.input.focus();
refreshState();
};

// Push the input area state to the stack.
var saveState = function(){

var currState = inputStateObj || new wmd.TextareaState();

if (!currState) {
return false;
}
if (mode == "moving") {
if (!lastState) {
lastState = currState;
}
return;
}
if (lastState) {
if (undoStack[stackPtr - 1].text != lastState.text) {
undoStack[stackPtr++] = lastState;
}
lastState = null;
}
undoStack[stackPtr++] = currState;
undoStack[stackPtr + 1] = null;
if (callback) {
callback();
}
};

var handleCtrlYZ = function(event){

var handled = false;

if (event.ctrlKey || event.metaKey) {

// IE and Opera do not support charCode.
var keyCode = event.charCode || event.keyCode;
var keyCodeChar = String.fromCharCode(keyCode);

switch (keyCodeChar) {

case "y":
undoObj.redo();
handled = true;
break;

case "z":
if (!event.shiftKey) {
undoObj.undo();
}
else {
undoObj.redo();
}
handled = true;
break;
}
}

if (handled) {
if (event.preventDefault) {
event.preventDefault();
}
if (top.event) {
top.event.returnValue = false;
}
return;
}
};

// Set the mode depending on what is going on in the input area.
var handleModeChange = function(event){

if (!event.ctrlKey && !event.metaKey) {

var keyCode = event.keyCode;

if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
// 33 - 40: page up/dn and arrow keys
// 63232 - 63235: page up/dn and arrow keys on safari
setMode("moving");
}
else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
// 8: backspace
// 46: delete
// 127: delete
setMode("deleting");
}
else if (keyCode == 13) {
// 13: Enter
setMode("newlines");
}
else if (keyCode == 27) {
// 27: escape
setMode("escape");
}
else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
// 16-20 are shift, etc.
// 91: left window key
// I think this might be a little messed up since there are
// a lot of nonprinting keys above 20.
setMode("typing");
}
}
};

var setEventHandlers = function(){

util.addEvent(wmd.panels.input, "keypress", function(event){
// keyCode 89: y
// keyCode 90: z
if ((event.ctrlKey || event.metaKey) && (event.keyCode == 89 || event.keyCode == 90)) {
event.preventDefault();
}
});

var handlePaste = function(){
if (global.isIE || (inputStateObj && inputStateObj.text != wmd.panels.input.value)) {
if (timer == undefined) {
mode = "paste";
saveState();
refreshState();
}
}
};

util.addEvent(wmd.panels.input, "keydown", handleCtrlYZ);
util.addEvent(wmd.panels.input, "keydown", handleModeChange);
util.addEvent(wmd.panels.input, "mousedown", function(){
setMode("moving");
});

wmd.panels.input.onpaste = handlePaste;
wmd.panels.input.ondrop = handlePaste;
};

var init = function(){
setEventHandlers();
refreshState();
saveState();
};

// this.destroy = function(){
// if (poller) {
// poller.destroy();
// }
// };

init();
};

// I think my understanding of how the buttons and callbacks are stored in the array is incomplete.
wmd.editor = function(previewRefreshCallback){

if (!previewRefreshCallback) {
previewRefreshCallback = function(){};
}

var inputBox = wmd.panels.input;

var offsetHeight = 0;

var editObj = this;

var mainDiv;
var mainSpan;

var div; // This name is pretty ambiguous. I should rename this.

// Used to cancel recurring events from setInterval.
var creationHandle;

var undoMgr; // The undo manager

// Perform the button's action.
var doClick = function(button){

inputBox.focus();

if (button.textOp) {

if (undoMgr) {
undoMgr.setCommandMode();
}

var state = new wmd.TextareaState();

if (!state) {
return;
}

var chunks = state.getChunks();

// Some commands launch a "modal" prompt dialog. Javascript
// can't really make a modal dialog box and the WMD code
// will continue to execute while the dialog is displayed.
// This prevents the dialog pattern I'm used to and means
// I can't do something like this:
//
// var link = CreateLinkDialog();
// makeMarkdownLink(link);
//
// Instead of this straightforward method of handling a
// dialog I have to pass any code which would execute
// after the dialog is dismissed (e.g. link creation)
// in a function parameter.
//
// Yes this is awkward and I think it sucks, but there's
// no real workaround. Only the image and link code
// create dialogs and require the function pointers.
var fixupInputArea = function(){

inputBox.focus();

if (chunks) {
state.setChunks(chunks);
}

state.restore();
previewRefreshCallback();
};

var noCleanup = button.textOp(chunks, fixupInputArea);

if(!noCleanup) {
fixupInputArea();
}

}

if (button.execute) {
button.execute(editObj);
}
};

var setUndoRedoButtonStates = function(){
if(undoMgr){
setupButton(document.getElementById("wmd-undo-button"), undoMgr.canUndo());
setupButton(document.getElementById("wmd-redo-button"), undoMgr.canRedo());
}
};

var setupButton = function(button, isEnabled) {

var normalYShift = "0px";
var disabledYShift = "-20px";
var highlightYShift = "-40px";

if(isEnabled) {
button.style.backgroundPosition = button.XShift + " " + normalYShift;
button.onmouseover = function(){
this.style.backgroundPosition = this.XShift + " " + highlightYShift;
};

button.onmouseout = function(){
this.style.backgroundPosition = this.XShift + " " + normalYShift;
};

// IE tries to select the background image "button" text (it's
// implemented in a list item) so we have to cache the selection
// on mousedown.
if(global.isIE) {
button.onmousedown = function() {
wmd.ieRetardedClick = true;
wmd.ieCachedRange = document.selection.createRange();
};
}

if (!button.isHelp)
{
button.onclick = function() {
if (this.onmouseout) {
this.onmouseout();
}
doClick(this);
return false;
}
}
}
else {
button.style.backgroundPosition = button.XShift + " " + disabledYShift;
button.onmouseover = button.onmouseout = button.onclick = function(){};
}
}

var makeSpritedButtonRow = function(){

var buttonBar = document.getElementById("wmd-button-bar");

var normalYShift = "0px";
var disabledYShift = "-20px";
var highlightYShift = "-40px";

var buttonRow = document.createElement("ul");
buttonRow.id = "wmd-button-row";
buttonRow = buttonBar.appendChild(buttonRow);

var boldButton = document.createElement("li");
boldButton.className = "wmd-button";
boldButton.id = "wmd-bold-button";
boldButton.title = "Strong <strong> Ctrl+B";
boldButton.XShift = "0px";
boldButton.textOp = command.doBold;
setupButton(boldButton, true);
buttonRow.appendChild(boldButton);

var italicButton = document.createElement("li");
italicButton.className = "wmd-button";
italicButton.id = "wmd-italic-button";
italicButton.title = "Emphasis <em> Ctrl+I";
italicButton.XShift = "-20px";
italicButton.textOp = command.doItalic;
setupButton(italicButton, true);
buttonRow.appendChild(italicButton);

var spacer1 = document.createElement("li");
spacer1.className = "wmd-spacer";
spacer1.id = "wmd-spacer1";
buttonRow.appendChild(spacer1);

var linkButton = document.createElement("li");
linkButton.className = "wmd-button";
linkButton.id = "wmd-link-button";
linkButton.title = "Hyperlink <a> Ctrl+L";
linkButton.XShift = "-40px";
linkButton.textOp = function(chunk, postProcessing){
return command.doLinkOrImage(chunk, postProcessing, false);
};
setupButton(linkButton, true);
buttonRow.appendChild(linkButton);

var quoteButton = document.createElement("li");
quoteButton.className = "wmd-button";
quoteButton.id = "wmd-quote-button";
quoteButton.title = "Blockquote <blockquote> Ctrl+Q";
quoteButton.XShift = "-60px";
quoteButton.textOp = command.doBlockquote;
setupButton(quoteButton, true);
buttonRow.appendChild(quoteButton);

var codeButton = document.createElement("li");
codeButton.className = "wmd-button";
codeButton.id = "wmd-code-button";
codeButton.title = "Code Sample <pre><code> Ctrl+K";
codeButton.XShift = "-80px";
codeButton.textOp = command.doCode;
setupButton(codeButton, true);
buttonRow.appendChild(codeButton);

var imageButton = document.createElement("li");
imageButton.className = "wmd-button";
imageButton.id = "wmd-image-button";
imageButton.title = "Image <img> Ctrl+G";
imageButton.XShift = "-100px";
imageButton.textOp = function(chunk, postProcessing){
return command.doLinkOrImage(chunk, postProcessing, true);
};
setupButton(imageButton, true);
buttonRow.appendChild(imageButton);

var spacer2 = document.createElement("li");
spacer2.className = "wmd-spacer";
spacer2.id = "wmd-spacer2";
buttonRow.appendChild(spacer2);

var olistButton = document.createElement("li");
olistButton.className = "wmd-button";
olistButton.id = "wmd-olist-button";
olistButton.title = "Numbered List <ol> Ctrl+O";
olistButton.XShift = "-120px";
olistButton.textOp = function(chunk, postProcessing){
command.doList(chunk, postProcessing, true);
};
setupButton(olistButton, true);
buttonRow.appendChild(olistButton);

var ulistButton = document.createElement("li");
ulistButton.className = "wmd-button";
ulistButton.id = "wmd-ulist-button";
ulistButton.title = "Bulleted List <ul> Ctrl+U";
ulistButton.XShift = "-140px";
ulistButton.textOp = function(chunk, postProcessing){
command.doList(chunk, postProcessing, false);
};
setupButton(ulistButton, true);
buttonRow.appendChild(ulistButton);

var headingButton = document.createElement("li");
headingButton.className = "wmd-button";
headingButton.id = "wmd-heading-button";
headingButton.title = "Heading <h1>/<h2> Ctrl+H";
headingButton.XShift = "-160px";
headingButton.textOp = command.doHeading;
setupButton(headingButton, true);
buttonRow.appendChild(headingButton);

var hrButton = document.createElement("li");
hrButton.className = "wmd-button";
hrButton.id = "wmd-hr-button";
hrButton.title = "Horizontal Rule <hr> Ctrl+R";
hrButton.XShift = "-180px";
hrButton.textOp = command.doHorizontalRule;
setupButton(hrButton, true);
buttonRow.appendChild(hrButton);

var spacer3 = document.createElement("li");
spacer3.className = "wmd-spacer";
spacer3.id = "wmd-spacer3";
buttonRow.appendChild(spacer3);

var undoButton = document.createElement("li");
undoButton.className = "wmd-button";
undoButton.id = "wmd-undo-button";
undoButton.title = "Undo - Ctrl+Z";
undoButton.XShift = "-200px";
undoButton.execute = function(manager){
manager.undo();
};
setupButton(undoButton, true);
buttonRow.appendChild(undoButton);

var redoButton = document.createElement("li");
redoButton.className = "wmd-button";
redoButton.id = "wmd-redo-button";
redoButton.title = "Redo - Ctrl+Y";
if (/win/.test(nav.platform.toLowerCase())) {
redoButton.title = "Redo - Ctrl+Y";
}
else {
// mac and other non-Windows platforms
redoButton.title = "Redo - Ctrl+Shift+Z";
}
redoButton.XShift = "-220px";
redoButton.execute = function(manager){
manager.redo();
};
setupButton(redoButton, true);
buttonRow.appendChild(redoButton);

var helpButton = document.createElement("li");
helpButton.className = "wmd-button";
helpButton.id = "wmd-help-button";
helpButton.XShift = "-240px";
helpButton.isHelp = true;
var helpAnchor = document.createElement("a");
helpAnchor.href = helpLink;
helpAnchor.target = "_blank";
helpAnchor.title = helpHoverTitle;
helpButton.appendChild(helpAnchor);
setupButton(helpButton, true);
buttonRow.appendChild(helpButton);

setUndoRedoButtonStates();
}

var setupEditor = function(){

if (/\?noundo/.test(doc.location.href)) {
wmd.nativeUndo = true;
}

if (!wmd.nativeUndo) {
undoMgr = new wmd.undoManager(function(){
previewRefreshCallback();
setUndoRedoButtonStates();
});
}

makeSpritedButtonRow();


var keyEvent = "keydown";
if (global.isOpera) {
keyEvent = "keypress";
}

util.addEvent(inputBox, keyEvent, function(key){

// Check to see if we have a button key and, if so execute the callback.
if (!key.altKey && (key.ctrlKey || key.metaKey)) {

var keyCode = key.charCode || key.keyCode;
var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();

switch(keyCodeStr) {
case "b":
doClick(document.getElementById("wmd-bold-button"));
break;
case "i":
doClick(document.getElementById("wmd-italic-button"));
break;
case "l":
doClick(document.getElementById("wmd-link-button"));
break;
case "q":
doClick(document.getElementById("wmd-quote-button"));
break;
case "k":
doClick(document.getElementById("wmd-code-button"));
break;
case "g":
doClick(document.getElementById("wmd-image-button"));
break;
case "o":
doClick(document.getElementById("wmd-olist-button"));
break;
case "u":
doClick(document.getElementById("wmd-ulist-button"));
break;
case "h":
doClick(document.getElementById("wmd-heading-button"));
break;
case "r":
doClick(document.getElementById("wmd-hr-button"));
break;
case "y":
doClick(document.getElementById("wmd-redo-button"));
break;
case "z":
if(key.shiftKey) {
doClick(document.getElementById("wmd-redo-button"));
}
else {
doClick(document.getElementById("wmd-undo-button"));
}
break;
default:
return;
}


if (key.preventDefault) {
key.preventDefault();
}

if (top.event) {
top.event.returnValue = false;
}
}
});

// Auto-indent on shift-enter
util.addEvent(inputBox, "keyup", function(key){
if (key.shiftKey && !key.ctrlKey && !key.metaKey) {
var keyCode = key.charCode || key.keyCode;
// Character 13 is Enter
if (keyCode === 13) {
fakeButton = {};
fakeButton.textOp = command.doAutoindent;
doClick(fakeButton);
}
}
});

// special handler because IE clears the context of the textbox on ESC
if (global.isIE) {
util.addEvent(inputBox, "keydown", function(key){
var code = key.keyCode;
if (code === 27) {
return false;
}
});
}

if (inputBox.form) {
var submitCallback = inputBox.form.onsubmit;
inputBox.form.onsubmit = function(){
convertToHtml();
if (submitCallback) {
return submitCallback.apply(this, arguments);
}
};
}
};

// Convert the contents of the input textarea to HTML in the output/preview panels.
var convertToHtml = function(){

if (wmd.showdown) {
var markdownConverter = new wmd.showdown.converter();
}
var text = inputBox.value;

var callback = function(){
inputBox.value = text;
};

if (!/markdown/.test(wmd.wmd_env.output.toLowerCase())) {
if (markdownConverter) {
inputBox.value = markdownConverter.makeHtml(text);
top.setTimeout(callback, 0);
}
}
return true;
};


this.undo = function(){
if (undoMgr) {
undoMgr.undo();
}
};

this.redo = function(){
if (undoMgr) {
undoMgr.redo();
}
};

// This is pretty useless. The setupEditor function contents
// should just be copied here.
var init = function(){
setupEditor();
};

this.destroy = function(){
if (undoMgr) {
undoMgr.destroy();
}
if (div.parentNode) {
div.parentNode.removeChild(div);
}
if (inputBox) {
inputBox.style.marginTop = "";
}
top.clearInterval(creationHandle);
};

init();
};

// The input textarea state/contents.
// This is used to implement undo/redo by the undo manager.
wmd.TextareaState = function(){

// Aliases
var stateObj = this;
var inputArea = wmd.panels.input;

this.init = function() {

if (!util.isVisible(inputArea)) {
return;
}

this.setInputAreaSelectionStartEnd();
this.scrollTop = inputArea.scrollTop;
if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
this.text = inputArea.value;
}

}

// Sets the selected text in the input box after we've performed an
// operation.
this.setInputAreaSelection = function(){

if (!util.isVisible(inputArea)) {
return;
}

if (inputArea.selectionStart !== undefined && !global.isOpera) {

inputArea.focus();
inputArea.selectionStart = stateObj.start;
inputArea.selectionEnd = stateObj.end;
inputArea.scrollTop = stateObj.scrollTop;
}
else if (doc.selection) {

if (doc.activeElement && doc.activeElement !== inputArea) {
return;
}

inputArea.focus();
var range = inputArea.createTextRange();
range.moveStart("character", -inputArea.value.length);
range.moveEnd("character", -inputArea.value.length);
range.moveEnd("character", stateObj.end);
range.moveStart("character", stateObj.start);
range.select();
}
};

this.setInputAreaSelectionStartEnd = function(){

if (inputArea.selectionStart || inputArea.selectionStart === 0) {

stateObj.start = inputArea.selectionStart;
stateObj.end = inputArea.selectionEnd;
}
else if (doc.selection) {

stateObj.text = util.fixEolChars(inputArea.value);

// IE loses the selection in the textarea when buttons are
// clicked. On IE we cache the selection and set a flag
// which we check for here.
var range;
if(wmd.ieRetardedClick && wmd.ieCachedRange) {
range = wmd.ieCachedRange;
wmd.ieRetardedClick = false;
}
else {
range = doc.selection.createRange();
}

var fixedRange = util.fixEolChars(range.text);
var marker = "\x07";
var markedRange = marker + fixedRange + marker;
range.text = markedRange;
var inputText = util.fixEolChars(inputArea.value);

range.moveStart("character", -markedRange.length);
range.text = fixedRange;

stateObj.start = inputText.indexOf(marker);
stateObj.end = inputText.lastIndexOf(marker) - marker.length;

var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;

if (len) {
range.moveStart("character", -fixedRange.length);
while (len--) {
fixedRange += "\n";
stateObj.end += 1;
}
range.text = fixedRange;
}

this.setInputAreaSelection();
}
};

// Restore this state into the input area.
this.restore = function(){

if (stateObj.text != undefined && stateObj.text != inputArea.value) {
inputArea.value = stateObj.text;
}
this.setInputAreaSelection();
inputArea.scrollTop = stateObj.scrollTop;
};

// Gets a collection of HTML chunks from the inptut textarea.
this.getChunks = function(){

var chunk = new wmd.Chunks();

chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
chunk.startTag = "";
chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
chunk.endTag = "";
chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
chunk.scrollTop = stateObj.scrollTop;

return chunk;
};

// Sets the TextareaState properties given a chunk of markdown.
this.setChunks = function(chunk){

chunk.before = chunk.before + chunk.startTag;
chunk.after = chunk.endTag + chunk.after;

if (global.isOpera) {
chunk.before = chunk.before.replace(/\n/g, "\r\n");
chunk.selection = chunk.selection.replace(/\n/g, "\r\n");
chunk.after = chunk.after.replace(/\n/g, "\r\n");
}

this.start = chunk.before.length;
this.end = chunk.before.length + chunk.selection.length;
this.text = chunk.before + chunk.selection + chunk.after;
this.scrollTop = chunk.scrollTop;
};

this.init();
};

// before: contains all the text in the input box BEFORE the selection.
// after: contains all the text in the input box AFTER the selection.
wmd.Chunks = function(){
};

// startRegex: a regular expression to find the start tag
// endRegex: a regular expresssion to find the end tag
wmd.Chunks.prototype.findTags = function(startRegex, endRegex){

var chunkObj = this;
var regex;

if (startRegex) {

regex = util.extendRegExp(startRegex, "", "$");

this.before = this.before.replace(regex,
function(match){
chunkObj.startTag = chunkObj.startTag + match;
return "";
});

regex = util.extendRegExp(startRegex, "^", "");

this.selection = this.selection.replace(regex,
function(match){
chunkObj.startTag = chunkObj.startTag + match;
return "";
});
}

if (endRegex) {

regex = util.extendRegExp(endRegex, "", "$");

this.selection = this.selection.replace(regex,
function(match){
chunkObj.endTag = match + chunkObj.endTag;
return "";
});

regex = util.extendRegExp(endRegex, "^", "");

this.after = this.after.replace(regex,
function(match){
chunkObj.endTag = match + chunkObj.endTag;
return "";
});
}
};

// If remove is false, the whitespace is transferred
// to the before/after regions.
//
// If remove is true, the whitespace disappears.
wmd.Chunks.prototype.trimWhitespace = function(remove){

this.selection = this.selection.replace(/^(\s*)/, "");

if (!remove) {
this.before += re.$1;
}

this.selection = this.selection.replace(/(\s*)$/, "");

if (!remove) {
this.after = re.$1 + this.after;
}
};


wmd.Chunks.prototype.skipLines = function(nLinesBefore, nLinesAfter, findExtraNewlines){

if (nLinesBefore === undefined) {
nLinesBefore = 1;
}

if (nLinesAfter === undefined) {
nLinesAfter = 1;
}

nLinesBefore++;
nLinesAfter++;

var regexText;
var replacementText;

this.selection = this.selection.replace(/(^\n*)/, "");
this.startTag = this.startTag + re.$1;
this.selection = this.selection.replace(/(\n*$)/, "");
this.endTag = this.endTag + re.$1;
this.startTag = this.startTag.replace(/(^\n*)/, "");
this.before = this.before + re.$1;
this.endTag = this.endTag.replace(/(\n*$)/, "");
this.after = this.after + re.$1;

if (this.before) {

regexText = replacementText = "";

while (nLinesBefore--) {
regexText += "\\n?";
replacementText += "\n";
}

if (findExtraNewlines) {
regexText = "\\n*";
}
this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
}

if (this.after) {

regexText = replacementText = "";

while (nLinesAfter--) {
regexText += "\\n?";
replacementText += "\n";
}
if (findExtraNewlines) {
regexText = "\\n*";
}

this.after = this.after.replace(new re(regexText, ""), replacementText);
}
};

// The markdown symbols - 4 spaces = code, > = blockquote, etc.
command.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";

// Remove markdown symbols from the chunk selection.
command.unwrap = function(chunk){
var txt = new re("([^\\n])\\n(?!(\\n|" + command.prefixes + "))", "g");
chunk.selection = chunk.selection.replace(txt, "$1 $2");
};

command.wrap = function(chunk, len){
command.unwrap(chunk);
var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm");

chunk.selection = chunk.selection.replace(regex, function(line, marked){
if (new re("^" + command.prefixes, "").test(line)) {
return line;
}
return marked + "\n";
});

chunk.selection = chunk.selection.replace(/\s+$/, "");
};

command.doBold = function(chunk, postProcessing){
return command.doBorI(chunk, postProcessing, 2, "strong text");
};

command.doItalic = function(chunk, postProcessing){
return command.doBorI(chunk, postProcessing, 1, "emphasized text");
};

// chunk: The selected region that will be enclosed with */**
// nStars: 1 for italics, 2 for bold
// insertText: If you just click the button without highlighting text, this gets inserted
command.doBorI = function(chunk, postProcessing, nStars, insertText){

// Get rid of whitespace and fixup newlines.
chunk.trimWhitespace();
chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");

// Look for stars before and after. Is the chunk already marked up?
chunk.before.search(/(\**$)/);
var starsBefore = re.$1;

chunk.after.search(/(^\**)/);
var starsAfter = re.$1;

var prevStars = Math.min(starsBefore.length, starsAfter.length);

// Remove stars if we have to since the button acts as a toggle.
if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
}
else if (!chunk.selection && starsAfter) {
// It's not really clear why this code is necessary. It just moves
// some arbitrary stuff around.
chunk.after = chunk.after.replace(/^([*_]*)/, "");
chunk.before = chunk.before.replace(/(\s?)$/, "");
var whitespace = re.$1;
chunk.before = chunk.before + starsAfter + whitespace;
}
else {

// In most cases, if you don't have any selected text and click the button
// you'll get a selected, marked up region with the default text inserted.
if (!chunk.selection && !starsAfter) {
chunk.selection = insertText;
}

// Add the true markup.
var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
chunk.before = chunk.before + markup;
chunk.after = markup + chunk.after;
}

return;
};

command.stripLinkDefs = function(text, defsToAdd){

text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
function(totalMatch, id, link, newlines, title){
defsToAdd[id] = totalMatch.replace(/\s*$/, "");
if (newlines) {
// Strip the title and return that separately.
defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
return newlines + title;
}
return "";
});

return text;
};

command.addLinkDef = function(chunk, linkDef){

var refNumber = 0; // The current reference number
var defsToAdd = {}; //
// Start with a clean slate by removing all previous link definitions.
chunk.before = command.stripLinkDefs(chunk.before, defsToAdd);
chunk.selection = command.stripLinkDefs(chunk.selection, defsToAdd);
chunk.after = command.stripLinkDefs(chunk.after, defsToAdd);

var defs = "";
var regex = /(\[(?:\[[^\]]*\]|[^\[\]])*\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;

var addDefNumber = function(def){
refNumber++;
def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, " [" + refNumber + "]:");
defs += "\n" + def;
};

var getLink = function(wholeMatch, link, id, end){

if (defsToAdd[id]) {
addDefNumber(defsToAdd[id]);
return link + refNumber + end;

}
return wholeMatch;
};

chunk.before = chunk.before.replace(regex, getLink);

if (linkDef) {
addDefNumber(linkDef);
}
else {
chunk.selection = chunk.selection.replace(regex, getLink);
}

var refOut = refNumber;

chunk.after = chunk.after.replace(regex, getLink);

if (chunk.after) {
chunk.after = chunk.after.replace(/\n*$/, "");
}
if (!chunk.after) {
chunk.selection = chunk.selection.replace(/\n*$/, "");
}

chunk.after += "\n\n" + defs;

return refOut;
};

command.doLinkOrImage = function(chunk, postProcessing, isImage){

chunk.trimWhitespace();
chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);

if (chunk.endTag.length > 1) {

chunk.startTag = chunk.startTag.replace(/!?\[/, "");
chunk.endTag = "";
command.addLinkDef(chunk, null);

}
else {

if (/\n\n/.test(chunk.selection)) {
command.addLinkDef(chunk, null);
return;
}

// The function to be executed when you enter a link and press OK or Cancel.
// Marks up the link and adds the ref.
var makeLinkMarkdown = function(link){

if (link !== null) {

chunk.startTag = chunk.endTag = "";
var linkDef = " [999]: " + link;

var num = command.addLinkDef(chunk, linkDef);
chunk.startTag = isImage ? "![" : "[";
chunk.endTag = "][" + num + "]";

if (!chunk.selection) {
if (isImage) {
chunk.selection = "alt text";
}
else {
chunk.selection = "link text";
}
}
}
postProcessing();
};

if (isImage) {
util.prompt(imageDialogText, imageDefaultText, makeLinkMarkdown);
}
else {
util.prompt(linkDialogText, linkDefaultText, makeLinkMarkdown);
}
return true;
}
};

util.makeAPI = function(){
wmd.wmd = {};
wmd.wmd.editor = wmd.editor;
wmd.wmd.previewManager = wmd.previewManager;
};

util.startEditor = function(){

var edit; // The editor (buttons + input + outputs) - the main object.
var previewMgr; // The preview manager.

wmd.panels = new wmd.PanelCollection();

previewMgr = new wmd.previewManager();
var previewRefreshCallback = previewMgr.refresh;

edit = new wmd.editor(previewRefreshCallback);
previewMgr.refresh(true);
};

wmd.previewManager = function(){

var managerObj = this;
var converter;
var poller;
var timeout;
var elapsedTime;
var oldInputText;
var htmlOut;
var maxDelay = 3000;
var startType = "delayed"; // The other legal value is "manual"

// Adds event listeners to elements and creates the input poller.
var setupEvents = function(inputElem, listener){

util.addEvent(inputElem, "input", listener);
inputElem.onpaste = listener;
inputElem.ondrop = listener;

util.addEvent(inputElem, "keypress", listener);
util.addEvent(inputElem, "keydown", listener);
};

var getDocScrollTop = function(){

var result = 0;

if (top.innerHeight) {
result = top.pageYOffset;
}
else
if (doc.documentElement && doc.documentElement.scrollTop) {
result = doc.documentElement.scrollTop;
}
else
if (doc.body) {
result = doc.body.scrollTop;
}

return result;
};

var makePreviewHtml = function(){

// If there are no registered preview and output panels
// there is nothing to do.
if (!wmd.panels.preview && !wmd.panels.output) {
return;
}

var text = wmd.panels.input.value;
if (text && text == oldInputText) {
return; // Input text hasn't changed.
}
else {
oldInputText = text;
}

var prevTime = new Date().getTime();

if (!converter && wmd.showdown) {
converter = new wmd.showdown.converter();
}

if (converter) {
text = converter.makeHtml(text);
}

// Calculate the processing time of the HTML creation.
// It's used as the delay time in the event listener.
var currTime = new Date().getTime();
elapsedTime = currTime - prevTime;

pushPreviewHtml(text);
htmlOut = text;
};

// setTimeout is already used. Used as an event listener.
var applyTimeout = function(){

if (timeout) {
top.clearTimeout(timeout);
timeout = undefined;
}

if (startType !== "manual") {

var delay = 0;

if (startType === "delayed") {
delay = elapsedTime;
}

if (delay > maxDelay) {
delay = maxDelay;
}
timeout = top.setTimeout(makePreviewHtml, delay);
}
};

var getScaleFactor = function(panel){
if (panel.scrollHeight <= panel.clientHeight) {
return 1;
}
return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
};

var setPanelScrollTops = function(){

if (wmd.panels.preview) {
wmd.panels.preview.scrollTop = (wmd.panels.preview.scrollHeight - wmd.panels.preview.clientHeight) * getScaleFactor(wmd.panels.preview);
;
}

if (wmd.panels.output) {
wmd.panels.output.scrollTop = (wmd.panels.output.scrollHeight - wmd.panels.output.clientHeight) * getScaleFactor(wmd.panels.output);
;
}
};

this.refresh = function(requiresRefresh){

if (requiresRefresh) {
oldInputText = "";
makePreviewHtml();
}
else {
applyTimeout();
}
};

this.processingTime = function(){
return elapsedTime;
};

// The output HTML
this.output = function(){
return htmlOut;
};

var isFirstTimeFilled = true;

var sanitizeHtml = function (html) {
return html.replace(/<[^<>]*>?/gi, sanitizeTag);
}

// (tags that can be opened/closed) | (tags that stand alone)
var basic_tag_whitelist = /^(<\/?(b|blockquote|code|del|dd|dl|dt|em|h1|h2|h3|i|kbd|li|ol|p|pre|s|sup|sub|strong|strike|ul)>|<(br|hr)\s?\/?>)$/i;
// <a href="url..." optional title>|</a>
var a_white = /^(<a\shref="(\#\d+|(https?|ftp):\/\/[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+)"(\stitle="[^"<>]+")?\s?>|<\/a>)$/i;

// <img src="url..." optional width optional height optional alt optional title
var img_white = /^(<img\ssrc="https?:(\/\/[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+)"(\swidth="\d{1,3}")?(\sheight="\d{1,3}")?(\salt="[^"<>]*")?(\stitle="[^"<>]*")?\s?\/?>)$/i;

function sanitizeTag(tag)
{
if(tag.match(basic_tag_whitelist) || tag.match(a_white) || tag.match(img_white))
return tag;
else
return "";
}

var pushPreviewHtml = function(text) {

var emptyTop = position.getTop(wmd.panels.input) - getDocScrollTop();

// Send the encoded HTML to the output textarea/div.
if (wmd.panels.output) {
// The value property is only defined if the output is a textarea.
if (wmd.panels.output.value !== undefined) {
wmd.panels.output.value = text;
wmd.panels.output.readOnly = true;
}
// Otherwise we are just replacing the text in a div.
// Send the HTML wrapped in <pre><code>
else {
var newText = text.replace(/&/g, "&amp;").replace(/</g, "&lt;");
wmd.panels.output.innerHTML = "<pre><code>" + newText + "</code></pre>";
}
}

if (wmd.panels.preview) {
wmd.panels.preview.innerHTML = sanitizeHtml(text);
}

setPanelScrollTops();

if (isFirstTimeFilled) {
isFirstTimeFilled = false;
return;
}

var fullTop = position.getTop(wmd.panels.input) - getDocScrollTop();

if (global.isIE) {
top.setTimeout(function(){
top.scrollBy(0, fullTop - emptyTop);
}, 0);
}
else {
top.scrollBy(0, fullTop - emptyTop);
}
};

var init = function(){

setupEvents(wmd.panels.input, applyTimeout);
makePreviewHtml();

if (wmd.panels.preview) {
wmd.panels.preview.scrollTop = 0;
}
if (wmd.panels.output) {
wmd.panels.output.scrollTop = 0;
}
};

this.destroy = function(){
if (poller) {
poller.destroy();
}
};

init();
};

// When making a list, hitting shift-enter will put your cursor on the next line
// at the current indent level.
command.doAutoindent = function(chunk, postProcessing){

chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");

if(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]+.*\n$/.test(chunk.before)){
if(command.doList){
command.doList(chunk);
}
}
if(/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)){
if(command.doBlockquote){
command.doBlockquote(chunk);
}
}
if(/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)){
if(command.doCode){
command.doCode(chunk);
}
}
};

command.doBlockquote = function(chunk, postProcessing){

chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
function(totalMatch, newlinesBefore, text, newlinesAfter){
chunk.before += newlinesBefore;
chunk.after = newlinesAfter + chunk.after;
return text;
});

chunk.before = chunk.before.replace(/(>[ \t]*)$/,
function(totalMatch, blankLine){
chunk.selection = blankLine + chunk.selection;
return "";
});

chunk.selection = chunk.selection.replace(/^(\s|>)+$/ ,"");
chunk.selection = chunk.selection || "Blockquote";

if(chunk.before){
chunk.before = chunk.before.replace(/\n?$/,"\n");
}
if(chunk.after){
chunk.after = chunk.after.replace(/^\n?/,"\n");
}

chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
function(totalMatch){
chunk.startTag = totalMatch;
return "";
});

chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
function(totalMatch){
chunk.endTag = totalMatch;
return "";
});

var replaceBlanksInTags = function(useBracket){

var replacement = useBracket ? "> " : "";

if(chunk.startTag){
chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
function(totalMatch, markdown){
return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
});
}
if(chunk.endTag){
chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
function(totalMatch, markdown){
return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
});
}
};

if(/^(?![ ]{0,3}>)/m.test(chunk.selection)){
command.wrap(chunk, wmd.wmd_env.lineLength - 2);
chunk.selection = chunk.selection.replace(/^/gm, "> ");
replaceBlanksInTags(true);
chunk.skipLines();
}
else{
chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
command.unwrap(chunk);
replaceBlanksInTags(false);

if(!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag){
chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
}

if(!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag){
chunk.endTag=chunk.endTag.replace(/^\n{0,2}/, "\n\n");
}
}

if(!/\n/.test(chunk.selection)){
chunk.selection = chunk.selection.replace(/^(> *)/,
function(wholeMatch, blanks){
chunk.startTag += blanks;
return "";
});
}
};

command.doCode = function(chunk, postProcessing){

var hasTextBefore = /\S[ ]*$/.test(chunk.before);
var hasTextAfter = /^[ ]*\S/.test(chunk.after);

// Use 'four space' markdown if the selection is on its own
// line or is multiline.
if((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)){

chunk.before = chunk.before.replace(/[ ]{4}$/,
function(totalMatch){
chunk.selection = totalMatch + chunk.selection;
return "";
});

var nLinesBack = 1;
var nLinesForward = 1;

if(/\n(\t|[ ]{4,}).*\n$/.test(chunk.before)){
nLinesBack = 0;
}
if(/^\n(\t|[ ]{4,})/.test(chunk.after)){
nLinesForward = 0;
}

chunk.skipLines(nLinesBack, nLinesForward);

if(!chunk.selection){
chunk.startTag = " ";
chunk.selection = "enter code here";
}
else {
if(/^[ ]{0,3}\S/m.test(chunk.selection)){
chunk.selection = chunk.selection.replace(/^/gm, " ");
}
else{
chunk.selection = chunk.selection.replace(/^[ ]{4}/gm, "");
}
}
}
else{
// Use backticks (`) to delimit the code block.

chunk.trimWhitespace();
chunk.findTags(/`/, /`/);

if(!chunk.startTag && !chunk.endTag){
chunk.startTag = chunk.endTag="`";
if(!chunk.selection){
chunk.selection = "enter code here";
}
}
else if(chunk.endTag && !chunk.startTag){
chunk.before += chunk.endTag;
chunk.endTag = "";
}
else{
chunk.startTag = chunk.endTag="";
}
}
};

command.doList = function(chunk, postProcessing, isNumberedList){

// These are identical except at the very beginning and end.
// Should probably use the regex extension function to make this clearer.
var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;

// The default bullet is a dash but others are possible.
// This has nothing to do with the particular HTML bullet,
// it's just a markdown bullet.
var bullet = "-";

// The number in a numbered list.
var num = 1;

// Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
var getItemPrefix = function(){
var prefix;
if(isNumberedList){
prefix = " " + num + ". ";
num++;
}
else{
prefix = " " + bullet + " ";
}
return prefix;
};

// Fixes the prefixes of the other list items.
var getPrefixedItem = function(itemText){

// The numbering flag is unset when called by autoindent.
if(isNumberedList === undefined){
isNumberedList = /^\s*\d/.test(itemText);
}

// Renumber/bullet the list element.
itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
function( _ ){
return getItemPrefix();
});

return itemText;
};

chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);

if(chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)){
chunk.before += chunk.startTag;
chunk.startTag = "";
}

if(chunk.startTag){

var hasDigits = /\d+[.]/.test(chunk.startTag);
chunk.startTag = "";
chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
command.unwrap(chunk);
chunk.skipLines();

if(hasDigits){
// Have to renumber the bullet points if this is a numbered list.
chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
}
if(isNumberedList == hasDigits){
return;
}
}

var nLinesUp = 1;

chunk.before = chunk.before.replace(previousItemsRegex,
function(itemText){
if(/^\s*([*+-])/.test(itemText)){
bullet = re.$1;
}
nLinesUp = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
return getPrefixedItem(itemText);
});

if(!chunk.selection){
chunk.selection = "List item";
}

var prefix = getItemPrefix();

var nLinesDown = 1;

chunk.after = chunk.after.replace(nextItemsRegex,
function(itemText){
nLinesDown = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
return getPrefixedItem(itemText);
});

chunk.trimWhitespace(true);
chunk.skipLines(nLinesUp, nLinesDown, true);
chunk.startTag = prefix;
var spaces = prefix.replace(/./g, " ");
command.wrap(chunk, wmd.wmd_env.lineLength - spaces.length);
chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);

};

command.doHeading = function(chunk, postProcessing){

// Remove leading/trailing whitespace and reduce internal spaces to single spaces.
chunk.selection = chunk.selection.replace(/\s+/g, " ");
chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");

// If we clicked the button with no selected text, we just
// make a level 2 hash header around some default text.
if(!chunk.selection){
chunk.startTag = "## ";
chunk.selection = "Heading";
chunk.endTag = " ##";
return;
}

var headerLevel = 0; // The existing header level of the selected text.

// Remove any existing hash heading markdown and save the header level.
chunk.findTags(/#+[ ]*/, /[ ]*#+/);
if(/#+/.test(chunk.startTag)){
headerLevel = re.lastMatch.length;
}
chunk.startTag = chunk.endTag = "";

// Try to get the current header level by looking for - and = in the line
// below the selection.
chunk.findTags(null, /\s?(-+|=+)/);
if(/=+/.test(chunk.endTag)){
headerLevel = 1;
}
if(/-+/.test(chunk.endTag)){
headerLevel = 2;
}

// Skip to the next line so we can create the header markdown.
chunk.startTag = chunk.endTag = "";
chunk.skipLines(1, 1);

// We make a level 2 header if there is no current header.
// If there is a header level, we substract one from the header level.
// If it's already a level 1 header, it's removed.
var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;

if(headerLevelToCreate > 0){

// The button only creates level 1 and 2 underline headers.
// Why not have it iterate over hash header levels? Wouldn't that be easier and cleaner?
var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
var len = chunk.selection.length;
if(len > wmd.wmd_env.lineLength){
len = wmd.wmd_env.lineLength;
}
chunk.endTag = "\n";
while(len--){
chunk.endTag += headerChar;
}
}
};

command.doHorizontalRule = function(chunk, postProcessing){
chunk.startTag = "----------\n";
chunk.selection = "";
chunk.skipLines(2, 1, true);
}
};

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