// // showdown.js -- A javascript port of Markdown. // // Copyright (c) 2007 John Fraser. // // Original Markdown Copyright (c) 2004-2005 John Gruber // // // 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 // // // // // Wherever possible, Showdown is a straight, line-by-line port // of the Perl version of Markdown. // // This is not a normal parser design; it's basically just a // series of string substitutions. It's hard to read and // maintain this way, but keeping Showdown close to the original // design makes it easier to port new features. // // More importantly, Showdown behaves like markdown.pl in most // edge cases. So web applications can do client-side preview // in Javascript, and then build identical HTML on the server. // // This port needs the new RegExp functionality of ECMA 262, // 3rd Edition (i.e. Javascript 1.5). Most modern web browsers // should do fine. Even with the new regular expression features, // We do a lot of work to emulate Perl's regex functionality. // The tricky changes in this file mostly have the "attacklab:" // label. Major or self-explanatory changes don't. // // Smart diff tools like Araxis Merge will be able to match up // this file with markdown.pl in a useful way. A little tweaking // helps: in a copy of markdown.pl, replace "#" with "//" and // replace "$text" with "text". Be sure to ignore whitespace // and line endings. // // // Showdown usage: // // var text = "Markdown *rocks*."; // // var converter = new Showdown.converter(); // var html = converter.makeHtml(text); // // alert(html); // // Note: move the sample code to the bottom of this // file before uncommenting it. // // // Showdown namespace // var Showdown = {extensions: {}}; // // forEach // var forEach = Showdown.forEach = function (obj, callback) { if (typeof obj.forEach === 'function') { obj.forEach(callback); } else { var i, len = obj.length; for (i = 0; i < len; i++) { callback(obj[i], i, obj); } } }; // // Standard extension naming // var stdExtName = function (s) { return s.replace(/[_-]||\s/g, '').toLowerCase(); }; // // converter // // Wraps all "globals" so that the only thing // exposed is makeHtml(). // Showdown.converter = function (converter_options) { // // Globals: // // Global hashes, used by various utility routines var g_urls; var g_titles; var g_html_blocks; // Used to track when we're inside an ordered or unordered list // (see _ProcessListItems() for details): var g_list_level = 0; // Global extensions var g_lang_extensions = []; var g_output_modifiers = []; // // Automatic Extension Loading (node only): // if (typeof module !== 'undefined' && typeof exports !== 'undefined' && typeof require !== 'undefined') { var fs = require('fs'); if (fs) { // Search extensions folder var extensions = fs.readdirSync((__dirname || '.') + '/extensions').filter(function (file) { return ~file.indexOf('.js'); }).map(function (file) { return file.replace(/\.js$/, ''); }); // Load extensions into Showdown namespace Showdown.forEach(extensions, function (ext) { var name = stdExtName(ext); Showdown.extensions[name] = require('./extensions/' + ext); }); } } 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 // and 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 = {}; g_titles = {}; g_html_blocks = []; // 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, ""); // Run language extensions Showdown.forEach(g_lang_extensions, function (x) { text = _ExecuteExtension(x, text); }); // Handle github codeblocks prior to running HashHTML so that // HTML contained within the codeblock gets escaped propertly text = _DoGithubCodeBlocks(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, "~"); // Run output modifiers Showdown.forEach(g_output_modifiers, function (x) { text = _ExecuteExtension(x, text); }); return text; }; // // Options: // // Parse extensions options into separate arrays if (converter_options && converter_options.extensions) { var self = this; // Iterate over each plugin Showdown.forEach(converter_options.extensions, function (plugin) { // Assume it's a bundled plugin if a string is given if (typeof plugin === 'string') { plugin = Showdown.extensions[stdExtName(plugin)]; } if (typeof plugin === 'function') { // Iterate over each extension within that plugin Showdown.forEach(plugin(self), function (ext) { // Sort extensions by type if (ext.type) { if (ext.type === 'language' || ext.type === 'lang') { g_lang_extensions.push(ext); } else if (ext.type === 'output' || ext.type === 'html') { g_output_modifiers.push(ext); } } else { // Assume language extension g_output_modifiers.push(ext); } }); } else { throw "Extension '" + plugin + "' could not be loaded. It was either not found or is not a valid extension."; } }); } var _ExecuteExtension = function (ext, text) { if (ext.regex) { var re = new RegExp(ext.regex, 'g'); return text.replace(re, ext.replace); } else if (ext.filter) { return ext.filter(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]* ? // 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(){...}); */ // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug text += "~0"; text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|(?=~0))/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, """); } // Completely remove the definition from the text return ""; } ); // attacklab: strip sentinel text = text.replace(/~0/, ""); 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

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|style|section|header|footer|nav|article|aside"; var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside"; // First, look for nested blocks, e.g.: //

//
// tags for inner block must be indented. //
//
// // 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 `
` and stop at the first `
`. // 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 // 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` to `\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 // 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|style|section|header|footer|nav|article|aside)\b[^\r]*?<\/\2>[ \t]*(?=\n+)\n)/gm, hashElement); // Special case just for
. 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 [ \t]* (?=\n{2,}) // followed by a blank line ) /g,hashElement); */ text = text.replace(/(\n\n[ ]{0,3}[ \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("
"); 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 //

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 `` // Must come after _DoAnchors(), because you can use < and > // delimiters in inline links like [this](). text = _DoAutoLinks(text); text = _EncodeAmpsAndAngles(text); text = _DoItalicsAndBold(text); // Do hard breaks: text = text.replace(/ +\n/g, "
\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\/!$]("[^"]*"|'[^']*'|[^'">])*>|)/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
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 = ""; return result; } var _DoImages = function (text) { // // Turn Markdown image shortcuts into 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 \( // literal paren [ \t]* () // no id, so leave $3 empty ? // src url = $4 [ \t]* ( // $5 (['"]) // quote char = $6 (.*?) // title = $7 \6 // matching quote [ \t]* )? // title is optional \) ) /g,writeImageTag); */ text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()?[ \t]*((['"])(.*?)\6[ \t]*)?\))/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, """); url = escapeCharacters(url, "*_"); var result = "\""' + _RunSpanGamut(m1) + ""); }); text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm, function (matchFound, m1) { return hashBlock('

' + _RunSpanGamut(m1) + "

"); }); // 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("' + _RunSpanGamut(m2) + ""); }); function headerId(m) { return m.replace(/[^\w]/g, '').toLowerCase(); } 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 `` // 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 + "\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 + "\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 "
  • " + item + "
  • \n"; } ); // attacklab: strip sentinel list_str = list_str.replace(/~0/g, ""); g_list_level--; return list_str; } var _DoCodeBlocks = function (text) { // // Process Markdown `
    ` 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 = "
    " + codeblock + "\n
    "; return hashBlock(codeblock) + nextChar; } ); // attacklab: strip sentinel text = text.replace(/~0/, ""); return text; }; var _DoGithubCodeBlocks = function (text) { // // Process Github-style code blocks // Example: // ```ruby // def hello_world(x) // puts "Hello, #{x}" // end // ``` // // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug text += "~0"; text = text.replace(/(?:^|\n)```(.*)\n([\s\S]*?)\n```/g, function (wholeMatch, m1, m2) { var language = m1; var codeblock = m2; codeblock = _EncodeCode(codeblock); codeblock = _Detab(codeblock); codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace codeblock = "
    " + codeblock + "\n
    "; return hashBlock(codeblock); } ); // attacklab: strip sentinel text = text.replace(/~0/, ""); return text; } var hashBlock = function (text) { text = text.replace(/(^\n+|\n+$)/g, ""); return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n"; } var _DoCodeSpans = function (text) { // // * Backtick quotes are used for 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: // //

    Just type foo `bar` baz at the prompt.

    // // 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 `bar` ... // /* 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 + "" + c + ""; }); 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, "&"); // Do the angle bracket song and dance: 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; } var _DoItalicsAndBold = function (text) { // must go first: text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g, "$2"); text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g, "$2"); 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
     content, so we need to fix that:
                    bq = bq.replace(
                        /(\s*
    [^\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("
    \n" + bq + "\n
    "); }); return text; } var _FormParagraphs = function (text) { // // Params: // $text - string to process with html

    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 = []; // // Wrap

    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, "

    "); str += "

    " 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, "&"); // Encode naked <'s text = text.replace(/<(?![a-z\/?\$!])/gi, "<"); 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, "
    $1"); // Email addresses: /* 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.: // // foo // @example.com // // Based on a filter by Matthew Wickline, posted to the BBEdit-Talk // mailing list: // var encode = [ function (ch) { return "&#" + ch.charCodeAt(0) + ";"; }, function (ch) { return "&#x" + ch.charCodeAt(0).toString(16) + ";"; }, 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 = "" + addr + ""; addr = addr.replace(/">.+:/g, "\">"); // strip the mailto: from the visible part return addr; } var _UnescapeSpecialChars = function (text) { // // Swap back in all the special characters we've hidden. // text = text.replace(/~E(\d+)E/g, function (wholeMatch, m1) { var charCodeToReplace = parseInt(m1); return String.fromCharCode(charCodeToReplace); } ); return text; } var _Outdent = function (text) { // // Remove one level of line-leading tabs or spaces // // attacklab: hack around Konqueror 3.5.4 bug: // "----------bug".replace(/^-/g,"") == "bug" text = text.replace(/^(\t|[ ]{1,4})/gm, "~0"); // attacklab: g_tab_width // attacklab: clean up hack text = text.replace(/~0/g, "") return text; } var _Detab = function (text) { // attacklab: Detab's completely rewritten for speed. // In perl we could fix it by anchoring the regexp with \G. // In javascript we're less fortunate. // expand first n-1 tabs text = text.replace(/\t(?=\t)/g, " "); // attacklab: g_tab_width // replace the nth with two sentinels text = text.replace(/\t/g, "~A~B"); // use the sentinel to anchor our regex so it doesn't explode text = text.replace(/~B(.+?)~A/g, function (wholeMatch, m1, m2) { var leadingText = m1; var numSpaces = 4 - leadingText.length % 4; // attacklab: g_tab_width // there *must* be a better way to do this: for (var i = 0; i < numSpaces; i++) leadingText += " "; return leadingText; } ); // clean up sentinels text = text.replace(/~A/g, " "); // attacklab: g_tab_width text = text.replace(/~B/g, ""); return text; } // // attacklab: Utility functions // var escapeCharacters = function (text, charsToEscape, afterBackslash) { // First we have to escape the escape characters so that // we can build a character class out of them var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])"; if (afterBackslash) { regexString = "\\\\" + regexString; } var regex = new RegExp(regexString, "g"); text = text.replace(regex, escapeCharacters_callback); return text; } var escapeCharacters_callback = function (wholeMatch, m1) { var charCodeToEscape = m1.charCodeAt(0); return "~E" + charCodeToEscape + "E"; } } // end of Showdown.converter // export if (typeof module !== 'undefined') module.exports = Showdown; // stolen from AMD branch of underscore // AMD define happens at the end for compatibility with AMD loaders // that don't enforce next-turn semantics on modules. if (typeof define === 'function' && define.amd) { define('showdown', function () { return Showdown; }); }