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Diffstat (limited to 'lib/js/showdown.js')
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diff --git a/lib/js/showdown.js b/lib/js/showdown.js new file mode 100644 index 0000000..a0da114 --- /dev/null +++ b/lib/js/showdown.js @@ -0,0 +1,1341 @@ +// +// 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 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 = {}; + +// +// converter +// +// Wraps all "globals" so that the only thing +// exposed is makeHtml(). +// +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,""); + + // 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,"~"); + + 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+|\Z)/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 ""; + } + ); + + 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|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.: + // <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|style|section|header|footer|nav|article|aside)\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,"""); + 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:  + // 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,"""); + 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,"""); + 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 id="' + headerId(m1) + '">' + _RunSpanGamut(m1) + "</h1>");}); + + text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm, + function(matchFound,m1){return hashBlock('<h2 id="' + headerId(m1) + '">' + _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 + ' id="' + headerId(m2) + '">' + _RunSpanGamut(m2) + "</h" + h_level + ">"); + }); + + 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 `</$list_type>` + // up on the preceding line, to get it past the current stupid + // HTML block parser. This is a hack to work around the terrible + // hack that is the HTML block parser. + result = result.replace(/\s+$/,""); + 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 _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+$/g,""); // trim trailing whitespace + + codeblock = "<pre><code" + (language ? " class=\"" + language + '"' : "") + ">" + codeblock + "\n</code></pre>"; + + return hashBlock(codeblock); + } + ); + + // attacklab: strip sentinel + text = text.replace(/~0/,""); + + return text; +} + +var hashBlock = function(text) { + text = text.replace(/(^\n+|\n+$)/g,""); + return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n"; +} + +var _DoCodeSpans = function(text) { +// +// * Backtick quotes are used for <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,"&"); + + // Do the angle bracket song and dance: + text = text.replace(/</g,"<"); + text = text.replace(/>/g,">"); + + // Now, escape characters that are magic in Markdown: + text = escapeCharacters(text,"\*_{}[]\\",false); + +// jj the line above breaks this: +//--- + +//* Item + +// 1. Subitem + +// special char: * +//--- + + return text; +} + + +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,"&"); + + // 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,"<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="mailto:foo@e +// xample.com">foo +// @example.com</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 Showdown.converter + +// export +if (typeof module !== 'undefined') module.exports = Showdown;
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