var Markdown; if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module Markdown = exports; else Markdown = {}; // The following text is included for historical reasons, but should // be taken with a pinch of salt; it's not all true anymore. // // Wherever possible, Showdown is a straight, line-by-line port // of the Perl version of Markdown. // // This is not a normal parser design; it's basically just a // series of string substitutions. It's hard to read and // maintain this way, but keeping Showdown close to the original // design makes it easier to port new features. // // More importantly, Showdown behaves like markdown.pl in most // edge cases. So web applications can do client-side preview // in Javascript, and then build identical HTML on the server. // // This port needs the new RegExp functionality of ECMA 262, // 3rd Edition (i.e. Javascript 1.5). Most modern web browsers // should do fine. Even with the new regular expression features, // We do a lot of work to emulate Perl's regex functionality. // The tricky changes in this file mostly have the "attacklab:" // label. Major or self-explanatory changes don't. // // Smart diff tools like Araxis Merge will be able to match up // this file with markdown.pl in a useful way. A little tweaking // helps: in a copy of markdown.pl, replace "#" with "//" and // replace "$text" with "text". Be sure to ignore whitespace // and line endings. // // // Usage: // // var text = "Markdown *rocks*."; // // var converter = new Markdown.Converter(); // var html = converter.makeHtml(text); // // alert(html); // // Note: move the sample code to the bottom of this // file before uncommenting it. // (function () { function identity(x) { return x; } function returnFalse(x) { return false; } function HookCollection() { } HookCollection.prototype = { chain: function (hookname, func) { var original = this[hookname]; if (!original) throw new Error("unknown hook " + hookname); if (original === identity) this[hookname] = func; else this[hookname] = function (text) { var args = Array.prototype.slice.call(arguments, 0); args[0] = original.apply(null, args); return func.apply(null, args); }; }, set: function (hookname, func) { if (!this[hookname]) throw new Error("unknown hook " + hookname); this[hookname] = func; }, addNoop: function (hookname) { this[hookname] = identity; }, addFalse: function (hookname) { this[hookname] = returnFalse; } }; Markdown.HookCollection = HookCollection; // g_urls and g_titles allow arbitrary user-entered strings as keys. This // caused an exception (and hence stopped the rendering) when the user entered // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this // (since no builtin property starts with "s_"). See // http://meta.stackoverflow.com/questions/64655/strange-wmd-bug // (granted, switching from Array() to Object() alone would have left only __proto__ // to be a problem) function SaveHash() { } SaveHash.prototype = { set: function (key, value) { this["s_" + key] = value; }, get: function (key) { return this["s_" + key]; } }; Markdown.Converter = function () { var pluginHooks = this.hooks = new HookCollection(); // given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link pluginHooks.addNoop("plainLinkText"); // called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked pluginHooks.addNoop("preConversion"); // called with the text once all normalizations have been completed (tabs to spaces, line endings, etc.), but before any conversions have pluginHooks.addNoop("postNormalization"); // Called with the text before / after creating block elements like code blocks and lists. Note that this is called recursively // with inner content, e.g. it's called with the full text, and then only with the content of a blockquote. The inner // call will receive outdented text. pluginHooks.addNoop("preBlockGamut"); pluginHooks.addNoop("postBlockGamut"); // called with the text of a single block element before / after the span-level conversions (bold, code spans, etc.) have been made pluginHooks.addNoop("preSpanGamut"); pluginHooks.addNoop("postSpanGamut"); // called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml pluginHooks.addNoop("postConversion"); // // Private state of the converter instance: // // Global hashes, used by various utility routines var g_urls; var g_titles; var g_html_blocks; // Used to track when we're inside an ordered or unordered list // (see _ProcessListItems() for details): var g_list_level; 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. // // This will only happen if makeHtml on the same converter instance is called from a plugin hook. // Don't do that. if (g_urls) throw new Error("Recursive call to converter.makeHtml"); // Create the private state objects. g_urls = new SaveHash(); g_titles = new SaveHash(); g_html_blocks = []; g_list_level = 0; text = pluginHooks.preConversion(text); // attacklab: Replace ~ with ~T // This lets us use tilde as an escape char to avoid md5 hashes // The choice of character is arbitray; anything that isn't // magic in Markdown will work. text = text.replace(/~/g, "~T"); // attacklab: Replace $ with ~D // RegExp interprets $ as a special character // when it's in a replacement string text = text.replace(/\$/g, "~D"); // Standardize line endings text = text.replace(/\r\n/g, "\n"); // DOS to Unix text = text.replace(/\r/g, "\n"); // Mac to Unix // Make sure text begins and ends with a couple of newlines: text = "\n\n" + text + "\n\n"; // Convert all tabs to spaces. text = _Detab(text); // Strip any lines consisting only of spaces and tabs. // This makes subsequent regexen easier to write, because we can // match consecutive blank lines with /\n+/ instead of something // contorted like /[ \t]*\n+/ . text = text.replace(/^[ \t]+$/mg, ""); text = pluginHooks.postNormalization(text); // Turn block-level HTML blocks into hash entries text = _HashHTMLBlocks(text); // Strip link definitions, store in hashes. text = _StripLinkDefinitions(text); text = _RunBlockGamut(text); text = _UnescapeSpecialChars(text); // attacklab: Restore dollar signs text = text.replace(/~D/g, "$$"); // attacklab: Restore tildes text = text.replace(/~T/g, "~"); text = pluginHooks.postConversion(text); g_html_blocks = g_titles = g_urls = null; return text; }; function _StripLinkDefinitions(text) { // // Strips link definitions from text, stores the URLs and titles in // hash references. // // Link defs are in the form: ^[id]: url "optional title" /* text = text.replace(/ ^[ ]{0,3}\[(.+)\]: // id = $1 attacklab: g_tab_width - 1 [ \t]* \n? // maybe *one* newline [ \t]* ? // url = $2 (?=\s|$) // lookahead for whitespace instead of the lookbehind removed below [ \t]* \n? // maybe one newline [ \t]* ( // (potential) title = $3 (\n*) // any lines skipped = $4 attacklab: lookbehind removed [ \t]+ ["(] (.+?) // title = $5 [")] [ \t]* )? // title is optional (?:\n+|$) /gm, function(){...}); */ text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*?(?=\s|$)[ \t]*\n?[ \t]*((\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm, function (wholeMatch, m1, m2, m3, m4, m5) { m1 = m1.toLowerCase(); g_urls.set(m1, _EncodeAmpsAndAngles(m2)); // Link IDs are case-insensitive if (m4) { // Oops, found blank lines, so it's not a title. // Put back the parenthetical statement we stole. return m3; } else if (m5) { g_titles.set(m1, m5.replace(/"/g, """)); } // Completely remove the definition from the text return ""; } ); return text; } function _HashHTMLBlocks(text) { // Hashify HTML blocks: // We only want to do this for block-level HTML tags, such as headers, // lists, and tables. That's because we still want to wrap

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.: //

//
// 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. /* 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` // /* 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)\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(/ \n // Starting after a blank line [ ]{0,3} ( // save in $1 (<(hr) // start tag = $2 \b // word break ([^<>])*? \/?>) // the matching end tag [ \t]* (?=\n{2,}) // followed by a blank line ) /g,hashElement); */ text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, hashElement); // Special case for standalone HTML comments: /* text = text.replace(/ \n\n // Starting after a blank line [ ]{0,3} // attacklab: g_tab_width - 1 ( // save in $1 -]|-[^>])(?:[^-]|-[^-])*)--) // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackoverflow.com/q/95256 > [ \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 (?: <([?%]) // $2 [^\r]*? \2> ) [ \t]* (?=\n{2,}) // followed by a blank line ) /g,hashElement); */ text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, hashElement); return text; } function hashElement(wholeMatch, m1) { var blockText = m1; // Undo double lines blockText = blockText.replace(/^\n+/, ""); // strip trailing blank lines blockText = blockText.replace(/\n+$/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 blockGamutHookCallback = function (t) { return _RunBlockGamut(t); } function _RunBlockGamut(text, doNotUnhash) { // // These are all the transformations that form block-level // tags like paragraphs, headers, and list items. // text = pluginHooks.preBlockGamut(text, blockGamutHookCallback); text = _DoHeaders(text); // Do Horizontal Rules: var replacement = "
\n"; text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm, replacement); text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement); text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement); text = _DoLists(text); text = _DoCodeBlocks(text); text = _DoBlockQuotes(text); text = pluginHooks.postBlockGamut(text, blockGamutHookCallback); // We already ran _HashHTMLBlocks() before, in Markdown(), but that // was to escape raw HTML in the original Markdown source. This time, // we're escaping the markup we've just created, so that we don't wrap //

tags around block-level tags. text = _HashHTMLBlocks(text); text = _FormParagraphs(text, doNotUnhash); return text; } function _RunSpanGamut(text) { // // These are all the transformations that occur *within* block-level // tags like paragraphs, headers, and list items. // text = pluginHooks.preSpanGamut(text); text = _DoCodeSpans(text); text = _EscapeSpecialCharsWithinTagAttributes(text); text = _EncodeBackslashEscapes(text); // Process anchor and image tags. Images must come first, // because ![foo][f] looks like an anchor. text = _DoImages(text); text = _DoAnchors(text); // Make links out of things like `` // Must come after _DoAnchors(), because you can use < and > // delimiters in inline links like [this](). text = _DoAutoLinks(text); text = text.replace(/~P/g, "://"); // put in place to prevent autolinking; reset now text = _EncodeAmpsAndAngles(text); text = _DoItalicsAndBold(text); // Do hard breaks: text = text.replace(/ +\n/g, "
\n"); text = pluginHooks.postSpanGamut(text); return text; } function _EscapeSpecialCharsWithinTagAttributes(text) { // // Within tags -- meaning between < and > -- encode [\ ` * _] so they // don't conflict with their use in Markdown for code, italics and strong. // // Build a regex to find HTML tags and comments. See Friedl's // "Mastering Regular Expressions", 2nd Ed., pp. 200-201. // SE: changed the comment part of the regex var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|-]|-[^>])(?:[^-]|-[^-])*)--)>)/gi; text = text.replace(regex, function (wholeMatch) { var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`"); tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`*_/" : "\\`*_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackoverflow.com/questions/95987 return tag; }); return text; } function _DoAnchors(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, writeAnchorTag); */ text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag); // // Next, inline-style links: [link text](url "optional title") // /* text = text.replace(/ ( // wrap whole match in $1 \[ ( (?: \[[^\]]*\] // allow brackets nested one level | [^\[\]] // or anything else )* ) \] \( // literal paren [ \t]* () // no id, so leave $3 empty ? [ \t]* ( // $5 (['"]) // quote char = $6 (.*?) // Title = $7 \6 // matching quote [ \t]* // ignore any spaces/tabs between closing quote and ) )? // title is optional \) ) /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; } function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) { if (m7 == undefined) m7 = ""; var whole_match = m1; var link_text = m2.replace(/:\/\//g, "~P"); // to prevent auto-linking withing the link. will be converted back after the auto-linker runs var link_id = m3.toLowerCase(); var url = m4; var title = m7; if (url == "") { if (link_id == "") { // lower-case and turn embedded newlines into spaces link_id = link_text.toLowerCase().replace(/ ?\n/g, " "); } url = "#" + link_id; if (g_urls.get(link_id) != undefined) { url = g_urls.get(link_id); if (g_titles.get(link_id) != undefined) { title = g_titles.get(link_id); } } else { if (whole_match.search(/\(\s*\)$/m) > -1) { // Special case for explicit empty url url = ""; } else { return whole_match; } } } url = encodeProblemUrlChars(url); url = escapeCharacters(url, "*_"); var result = ""; return result; } function _DoImages(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; } function attributeEncode(text) { // unconditionally replace angle brackets here -- what ends up in an attribute (e.g. alt or title) // never makes sense to have verbatim HTML in it (and the sanitizer would totally break it) return text.replace(/>/g, ">").replace(/" + _RunSpanGamut(m1) + "\n\n"; } ); text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm, function (matchFound, m1) { return "

" + _RunSpanGamut(m1) + "

\n\n"; } ); // atx-style headers: // # Header 1 // ## Header 2 // ## Header 2 with closing hashes ## // ... // ###### Header 6 // /* text = text.replace(/ ^(\#{1,6}) // $1 = string of #'s [ \t]* (.+?) // $2 = Header text [ \t]* \#* // optional closing #'s (not counted) \n+ /gm, function() {...}); */ text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm, function (wholeMatch, m1, m2) { var h_level = m1.length; return "" + _RunSpanGamut(m2) + "\n\n"; } ); return text; } function _DoLists(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"; var result = _ProcessListItems(list, list_type); // 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"; var result = _ProcessListItems(list, list_type); result = runup + "<" + list_type + ">\n" + result + "\n"; return result; }); } // attacklab: strip sentinel text = text.replace(/~0/, ""); return text; } var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" }; function _ProcessListItems(list_str, list_type) { // // Process the contents of a single ordered or unordered list, splitting it // into individual list items. // // list_type is either "ul" or "ol". // The $g_list_level global keeps track of when we're inside a list. // Each time we enter a list, we increment it; when we leave a list, // we decrement. If it's zero, we're not in a list anymore. // // We do this because when we're not inside a list, we want to treat // something like this: // // I recommend upgrading to version // 8. Oops, now this line is treated // as a sub-list. // // As a single paragraph, despite the fact that the second line starts // with a digit-period-space sequence. // // Whereas when we're inside a list (or sub-list), that line will be // treated as the start of a sub-list. What a kludge, huh? This is // an aspect of Markdown's syntax that's hard to parse perfectly // without resorting to mind-reading. Perhaps the solution is to // change the syntax rules such that sub-lists must start with a // starting cardinal number; e.g. "1." or "a.". g_list_level++; // trim trailing blank lines: list_str = list_str.replace(/\n{2,}$/, "\n"); // attacklab: add sentinel to emulate \z list_str += "~0"; // In the original attacklab showdown, list_type was not given to this function, and anything // that matched /[*+-]|\d+[.]/ would just create the next
  • , causing this mismatch: // // Markdown rendered by WMD rendered by MarkdownSharp // ------------------------------------------------------------------ // 1. first 1. first 1. first // 2. second 2. second 2. second // - third 3. third * third // // We changed this to behave identical to MarkdownSharp. This is the constructed RegEx, // with {MARKER} being one of \d+[.] or [*+-], depending on list_type: /* list_str = list_str.replace(/ (^[ \t]*) // leading whitespace = $1 ({MARKER}) [ \t]+ // list marker = $2 ([^\r]+? // list item text = $3 (\n+) ) (?= (~0 | \2 ({MARKER}) [ \t]+) ) /gm, function(){...}); */ var marker = _listItemMarkers[list_type]; var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0|\\1(" + marker + ")[ \\t]+))", "gm"); var last_item_had_a_double_newline = false; list_str = list_str.replace(re, function (wholeMatch, m1, m2, m3) { var item = m3; var leading_space = m1; var ends_with_double_newline = /\n\n$/.test(item); var contains_double_newline = ends_with_double_newline || item.search(/\n{2,}/) > -1; if (contains_double_newline || last_item_had_a_double_newline) { item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = */true); } else { // Recursion for sub-lists: item = _DoLists(_Outdent(item)); item = item.replace(/\n$/, ""); // chomp(item) item = _RunSpanGamut(item); } last_item_had_a_double_newline = ends_with_double_newline; return "
  • " + item + "
  • \n"; } ); // attacklab: strip sentinel list_str = list_str.replace(/~0/g, ""); g_list_level--; return list_str; } function _DoCodeBlocks(text) { // // Process Markdown `
    ` blocks.
                //
    
                /*
                text = text.replace(/
                    (?:\n\n|^)
                    (                               // $1 = the code block -- one or more lines, starting with a space/tab
                        (?:
                            (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
                            .*\n+
                        )+
                    )
                    (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
                /g ,function(){...});
                */
    
                // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
                text += "~0";
    
                text = text.replace(/(?:\n\n|^\n?)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
                    function (wholeMatch, m1, m2) {
                        var codeblock = m1;
                        var nextChar = m2;
    
                        codeblock = _EncodeCode(_Outdent(codeblock));
                        codeblock = _Detab(codeblock);
                        codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines
                        codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace
    
                        codeblock = "
    " + codeblock + "\n
    "; return "\n\n" + codeblock + "\n\n" + nextChar; } ); // attacklab: strip sentinel text = text.replace(/~0/, ""); return text; } function hashBlock(text) { text = text.replace(/(^\n+|\n+$)/g, ""); return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n"; } function _DoCodeSpans(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); c = c.replace(/:\/\//g, "~P"); // to prevent auto-linking. Not necessary in code *blocks*, but in code spans. Will be converted back after the auto-linker runs. return m1 + "" + c + ""; } ); return text; } function _EncodeCode(text) { // // Encode/escape certain characters inside Markdown code runs. // The point is that in code, these characters are literals, // and lose their special Markdown meanings. // // Encode all ampersands; HTML entities are not // entities within a Markdown code span. text = text.replace(/&/g, "&"); // Do the angle bracket song and dance: text = text.replace(//g, ">"); // Now, escape characters that are magic in Markdown: text = escapeCharacters(text, "\*_{}[]\\", false); // jj the line above breaks this: //--- //* Item // 1. Subitem // special char: * //--- return text; } function _DoItalicsAndBold(text) { // must go first: text = text.replace(/([\W_]|^)(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\2([\W_]|$)/g, "$1$3$4"); text = text.replace(/([\W_]|^)(\*|_)(?=\S)([^\r\*_]*?\S)\2([\W_]|$)/g, "$1$3$4"); return text; } function _DoBlockQuotes(text) { /* text = text.replace(/ ( // Wrap whole match in $1 ( ^[ \t]*>[ \t]? // '>' at the start of a line .+\n // rest of the first line (.+\n)* // subsequent consecutive lines \n* // blanks )+ ) /gm, function(){...}); */ text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm, function (wholeMatch, m1) { var bq = m1; // attacklab: hack around Konqueror 3.5.4 bug: // "----------bug".replace(/^-/g,"") == "bug" bq = bq.replace(/^[ \t]*>[ \t]?/gm, "~0"); // trim one level of quoting // attacklab: clean up hack bq = bq.replace(/~0/g, ""); bq = bq.replace(/^[ \t]+$/gm, ""); // trim whitespace-only lines bq = _RunBlockGamut(bq); // recurse bq = bq.replace(/(^|\n)/g, "$1 "); // These leading spaces screw with
     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; } function _FormParagraphs(text, doNotUnhash) { // // 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 = []; var markerRe = /~K(\d+)K/; // // 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 (markerRe.test(str)) { grafsOut.push(str); } else if (/\S/.test(str)) { str = _RunSpanGamut(str); str = str.replace(/^([ \t]*)/g, "

    "); str += "

    " grafsOut.push(str); } } // // Unhashify HTML blocks // if (!doNotUnhash) { end = grafsOut.length; for (var i = 0; i < end; i++) { var foundAny = true; while (foundAny) { // we may need several runs, since the data may be nested foundAny = false; grafsOut[i] = grafsOut[i].replace(/~K(\d+)K/g, function (wholeMatch, id) { foundAny = true; return g_html_blocks[id]; }); } } } return grafsOut.join("\n\n"); } function _EncodeAmpsAndAngles(text) { // Smart processing for ampersands and angle brackets that need to be encoded. // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin: // http://bumppo.net/projects/amputator/ text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, "&"); // Encode naked <'s text = text.replace(/<(?![a-z\/?\$!])/gi, "<"); return text; } function _EncodeBackslashEscapes(text) { // // Parameter: String. // Returns: The string, with after processing the following backslash // escape sequences. // // attacklab: The polite way to do this is with the new // escapeCharacters() function: // // text = escapeCharacters(text,"\\",true); // text = escapeCharacters(text,"`*_{}[]()>#+-.!",true); // // ...but we're sidestepping its use of the (slow) RegExp constructor // as an optimization for Firefox. This function gets called a LOT. text = text.replace(/\\(\\)/g, escapeCharacters_callback); text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g, escapeCharacters_callback); return text; } function handleTrailingParens(wholeMatch, lookbehind, protocol, link) { if (lookbehind) return wholeMatch; if (link.charAt(link.length - 1) !== ")") return "<" + protocol + link + ">"; var parens = link.match(/[()]/g); var level = 0; for (var i = 0; i < parens.length; i++) { if (parens[i] === "(") { if (level <= 0) level = 1; else level++; } else { level--; } } var tail = ""; if (level < 0) { var re = new RegExp("\\){1," + (-level) + "}$"); link = link.replace(re, function (trailingParens) { tail = trailingParens; return ""; }); } return "<" + protocol + link + ">" + tail; } function _DoAutoLinks(text) { // note that at this point, all other URL in the text are already hyperlinked as
    // *except* for the case // automatically add < and > around unadorned raw hyperlinks // must be preceded by a non-word character (and not by =" or <) and followed by non-word/EOF character // simulating the lookbehind in a consuming way is okay here, since a URL can neither and with a " nor // with a <, so there is no risk of overlapping matches. text = text.replace(/(="|='|<)?\b(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\])])(?=$|\W)/gi, handleTrailingParens); // autolink anything like var replacer = function (wholematch, m1) { m1encoded = m1.replace(/\_\_/, '%5F%5F'); return "" + pluginHooks.plainLinkText(m1) + ""; } text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer); return text; } function _UnescapeSpecialChars(text) { // // Swap back in all the special characters we've hidden. // text = text.replace(/~E(\d+)E/g, function (wholeMatch, m1) { var charCodeToReplace = parseInt(m1); return String.fromCharCode(charCodeToReplace); } ); return text; } function _Outdent(text) { // // Remove one level of line-leading tabs or spaces // // attacklab: hack around Konqueror 3.5.4 bug: // "----------bug".replace(/^-/g,"") == "bug" text = text.replace(/^(\t|[ ]{1,4})/gm, "~0"); // attacklab: g_tab_width // attacklab: clean up hack text = text.replace(/~0/g, "") return text; } function _Detab(text) { if (!/\t/.test(text)) return text; var spaces = [" ", " ", " ", " "], skew = 0, v; return text.replace(/[\n\t]/g, function (match, offset) { if (match === "\n") { skew = offset + 1; return match; } v = (offset - skew) % 4; skew = offset + 1; return spaces[v]; }); } // // attacklab: Utility functions // var _problemUrlChars = /(?:["'*()[\]:]|~D)/g; // hex-encodes some unusual "problem" chars in URLs to avoid URL detection problems function encodeProblemUrlChars(url) { if (!url) return ""; var len = url.length; return url.replace(_problemUrlChars, function (match, offset) { if (match == "~D") // escape for dollar return "%24"; if (match == ":") { if (offset == len - 1 || /[0-9\/]/.test(url.charAt(offset + 1))) return ":" } return "%" + match.charCodeAt(0).toString(16); }); } function escapeCharacters(text, charsToEscape, afterBackslash) { // First we have to escape the escape characters so that // we can build a character class out of them var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])"; if (afterBackslash) { regexString = "\\\\" + regexString; } var regex = new RegExp(regexString, "g"); text = text.replace(regex, escapeCharacters_callback); return text; } function escapeCharacters_callback(wholeMatch, m1) { var charCodeToEscape = m1.charCodeAt(0); return "~E" + charCodeToEscape + "E"; } }; // end of the Markdown.Converter constructor })();