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// |
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// showdown.js -- A javascript port of Markdown. |
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// |
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// Copyright (c) 2007 John Fraser. |
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// |
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// Original Markdown Copyright (c) 2004-2005 John Gruber |
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// <http://daringfireball.net/projects/markdown/> |
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// |
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// Redistributable under a BSD-style open source license. |
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// See license.txt for more information. |
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// |
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// The full source distribution is at: |
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// |
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// A A L |
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// T C A |
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// T K B |
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// |
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// <http://www.attacklab.net/> |
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// |
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// |
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// Wherever possible, Showdown is a straight, line-by-line port |
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// of the Perl version of Markdown. |
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// |
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// This is not a normal parser design; it's basically just a |
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// series of string substitutions. It's hard to read and |
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// maintain this way, but keeping Showdown close to the original |
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// design makes it easier to port new features. |
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// |
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// More importantly, Showdown behaves like markdown.pl in most |
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// edge cases. So web applications can do client-side preview |
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// in Javascript, and then build identical HTML on the server. |
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// |
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// This port needs the new RegExp functionality of ECMA 262, |
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// 3rd Edition (i.e. Javascript 1.5). Most modern web browsers |
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// should do fine. Even with the new regular expression features, |
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// We do a lot of work to emulate Perl's regex functionality. |
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// The tricky changes in this file mostly have the "attacklab:" |
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// label. Major or self-explanatory changes don't. |
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// |
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// Smart diff tools like Araxis Merge will be able to match up |
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// this file with markdown.pl in a useful way. A little tweaking |
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// helps: in a copy of markdown.pl, replace "#" with "//" and |
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// replace "$text" with "text". Be sure to ignore whitespace |
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// and line endings. |
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// |
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// |
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// Showdown usage: |
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// |
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// var text = "Markdown *rocks*."; |
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// |
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// var converter = new Showdown.converter(); |
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// var html = converter.makeHtml(text); |
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// |
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// alert(html); |
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// |
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// Note: move the sample code to the bottom of this |
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// file before uncommenting it. |
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// |
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// |
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// Showdown namespace |
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// |
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var Showdown = { extensions: {} }; |
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// |
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// forEach |
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// |
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var forEach = Showdown.forEach = function(obj, callback) { |
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if (typeof obj.forEach === 'function') { |
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obj.forEach(callback); |
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} else { |
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var i, len = obj.length; |
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for (i = 0; i < len; i++) { |
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callback(obj[i], i, obj); |
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} |
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} |
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}; |
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// |
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// Standard extension naming |
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// |
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var stdExtName = function(s) { |
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return s.replace(/[_-]||\s/g, '').toLowerCase(); |
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}; |
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// |
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// converter |
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// |
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// Wraps all "globals" so that the only thing |
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// exposed is makeHtml(). |
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// |
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Showdown.converter = function(converter_options) { |
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// |
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// Globals: |
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// |
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// Global hashes, used by various utility routines |
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var g_urls; |
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var g_titles; |
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var g_html_blocks; |
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// Used to track when we're inside an ordered or unordered list |
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// (see _ProcessListItems() for details): |
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var g_list_level = 0; |
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// Global extensions |
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var g_lang_extensions = []; |
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var g_output_modifiers = []; |
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// |
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// Automatic Extension Loading (node only): |
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// |
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if (typeof module !== 'undefind' && typeof exports !== 'undefined' && typeof require !== 'undefind') { |
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var fs = require('fs'); |
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if (fs) { |
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// Search extensions folder |
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var extensions = fs.readdirSync((__dirname || '.')+'/extensions').filter(function(file){ |
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return ~file.indexOf('.js'); |
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}).map(function(file){ |
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return file.replace(/\.js$/, ''); |
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}); |
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// Load extensions into Showdown namespace |
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Showdown.forEach(extensions, function(ext){ |
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var name = stdExtName(ext); |
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Showdown.extensions[name] = require('./extensions/' + ext); |
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}); |
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} |
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} |
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this.makeHtml = function(text) { |
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// |
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// Main function. The order in which other subs are called here is |
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// essential. Link and image substitutions need to happen before |
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// _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a> |
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// and <img> tags get encoded. |
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// |
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// Clear the global hashes. If we don't clear these, you get conflicts |
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// from other articles when generating a page which contains more than |
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// one article (e.g. an index page that shows the N most recent |
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// articles): |
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g_urls = {}; |
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g_titles = {}; |
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g_html_blocks = []; |
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// attacklab: Replace ~ with ~T |
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// This lets us use tilde as an escape char to avoid md5 hashes |
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// The choice of character is arbitray; anything that isn't |
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// magic in Markdown will work. |
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text = text.replace(/~/g,"~T"); |
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// attacklab: Replace $ with ~D |
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// RegExp interprets $ as a special character |
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// when it's in a replacement string |
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text = text.replace(/\$/g,"~D"); |
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// Standardize line endings |
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text = text.replace(/\r\n/g,"\n"); // DOS to Unix |
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text = text.replace(/\r/g,"\n"); // Mac to Unix |
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// Make sure text begins and ends with a couple of newlines: |
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text = "\n\n" + text + "\n\n"; |
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// Convert all tabs to spaces. |
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text = _Detab(text); |
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// Strip any lines consisting only of spaces and tabs. |
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// This makes subsequent regexen easier to write, because we can |
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// match consecutive blank lines with /\n+/ instead of something |
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// contorted like /[ \t]*\n+/ . |
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text = text.replace(/^[ \t]+$/mg,""); |
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// Run language extensions |
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Showdown.forEach(g_lang_extensions, function(x){ |
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text = _ExecuteExtension(x, text); |
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}); |
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// Handle github codeblocks prior to running HashHTML so that |
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// HTML contained within the codeblock gets escaped propertly |
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text = _DoGithubCodeBlocks(text); |
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// Turn block-level HTML blocks into hash entries |
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text = _HashHTMLBlocks(text); |
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// Strip link definitions, store in hashes. |
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text = _StripLinkDefinitions(text); |
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text = _RunBlockGamut(text); |
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text = _UnescapeSpecialChars(text); |
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// attacklab: Restore dollar signs |
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text = text.replace(/~D/g,"$$"); |
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// attacklab: Restore tildes |
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text = text.replace(/~T/g,"~"); |
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// Run output modifiers |
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Showdown.forEach(g_output_modifiers, function(x){ |
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text = _ExecuteExtension(x, text); |
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}); |
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return text; |
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}; |
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// |
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// Options: |
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// |
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// Parse extensions options into separate arrays |
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if (converter_options && converter_options.extensions) { |
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var self = this; |
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// Iterate over each plugin |
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Showdown.forEach(converter_options.extensions, function(plugin){ |
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// Assume it's a bundled plugin if a string is given |
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if (typeof plugin === 'string') { |
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plugin = Showdown.extensions[stdExtName(plugin)]; |
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} |
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if (typeof plugin === 'function') { |
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// Iterate over each extension within that plugin |
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Showdown.forEach(plugin(self), function(ext){ |
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// Sort extensions by type |
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if (ext.type) { |
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if (ext.type === 'language' || ext.type === 'lang') { |
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g_lang_extensions.push(ext); |
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} else if (ext.type === 'output' || ext.type === 'html') { |
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g_output_modifiers.push(ext); |
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} |
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} else { |
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// Assume language extension |
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g_output_modifiers.push(ext); |
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} |
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}); |
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} else { |
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throw "Extension '" + plugin + "' could not be loaded. It was either not found or is not a valid extension."; |
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} |
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}); |
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} |
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var _ExecuteExtension = function(ext, text) { |
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if (ext.regex) { |
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var re = new RegExp(ext.regex, 'g'); |
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return text.replace(re, ext.replace); |
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} else if (ext.filter) { |
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return ext.filter(text); |
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} |
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}; |
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var _StripLinkDefinitions = function(text) { |
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// |
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// Strips link definitions from text, stores the URLs and titles in |
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// hash references. |
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// |
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// Link defs are in the form: ^[id]: url "optional title" |
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/* |
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var text = text.replace(/ |
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^[ ]{0,3}\[(.+)\]: // id = $1 attacklab: g_tab_width - 1 |
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[ \t]* |
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\n? // maybe *one* newline |
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[ \t]* |
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<?(\S+?)>? // url = $2 |
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[ \t]* |
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\n? // maybe one newline |
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[ \t]* |
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(?: |
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(\n*) // any lines skipped = $3 attacklab: lookbehind removed |
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["(] |
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(.+?) // title = $4 |
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[")] |
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[ \t]* |
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)? // title is optional |
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(?:\n+|$) |
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/gm, |
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function(){...}); |
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*/ |
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// attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug |
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text += "~0"; |
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text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|(?=~0))/gm, |
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function (wholeMatch,m1,m2,m3,m4) { |
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m1 = m1.toLowerCase(); |
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g_urls[m1] = _EncodeAmpsAndAngles(m2); // Link IDs are case-insensitive |
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if (m3) { |
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// Oops, found blank lines, so it's not a title. |
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// Put back the parenthetical statement we stole. |
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return m3+m4; |
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} else if (m4) { |
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g_titles[m1] = m4.replace(/"/g,"""); |
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} |
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// Completely remove the definition from the text |
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return ""; |
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} |
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); |
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// attacklab: strip sentinel |
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text = text.replace(/~0/,""); |
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return text; |
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} |
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var _HashHTMLBlocks = function(text) { |
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// attacklab: Double up blank lines to reduce lookaround |
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text = text.replace(/\n/g,"\n\n"); |
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// Hashify HTML blocks: |
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// We only want to do this for block-level HTML tags, such as headers, |
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// lists, and tables. That's because we still want to wrap <p>s around |
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// "paragraphs" that are wrapped in non-block-level tags, such as anchors, |
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// phrase emphasis, and spans. The list of tags we're looking for is |
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// hard-coded: |
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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"; |
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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"; |
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// First, look for nested blocks, e.g.: |
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// <div> |
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// <div> |
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// tags for inner block must be indented. |
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// </div> |
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// </div> |
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// |
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// The outermost tags must start at the left margin for this to match, and |
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// the inner nested divs must be indented. |
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// We need to do this before the next, more liberal match, because the next |
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// match will start at the first `<div>` and stop at the first `</div>`. |
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// attacklab: This regex can be expensive when it fails. |
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/* |
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var text = text.replace(/ |
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( // save in $1 |
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^ // start of line (with /m) |
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<($block_tags_a) // start tag = $2 |
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\b // word break |
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// attacklab: hack around khtml/pcre bug... |
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[^\r]*?\n // any number of lines, minimally matching |
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</\2> // the matching end tag |
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[ \t]* // trailing spaces/tabs |
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(?=\n+) // followed by a newline |
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) // attacklab: there are sentinel newlines at end of document |
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/gm,function(){...}}; |
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*/ |
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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); |
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// |
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// Now match more liberally, simply from `\n<tag>` to `</tag>\n` |
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// |
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/* |
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var text = text.replace(/ |
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( // save in $1 |
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^ // start of line (with /m) |
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<($block_tags_b) // start tag = $2 |
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\b // word break |
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// attacklab: hack around khtml/pcre bug... |
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[^\r]*? // any number of lines, minimally matching |
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</\2> // the matching end tag |
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[ \t]* // trailing spaces/tabs |
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(?=\n+) // followed by a newline |
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) // attacklab: there are sentinel newlines at end of document |
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/gm,function(){...}}; |
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*/ |
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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); |
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// Special case just for <hr />. It was easier to make a special case than |
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// to make the other regex more complicated. |
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/* |
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text = text.replace(/ |
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( // save in $1 |
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\n\n // Starting after a blank line |
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[ ]{0,3} |
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(<(hr) // start tag = $2 |
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\b // word break |
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([^<>])*? // |
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\/?>) // the matching end tag |
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[ \t]* |
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(?=\n{2,}) // followed by a blank line |
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) |
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/g,hashElement); |
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*/ |
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text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement); |
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// Special case for standalone HTML comments: |
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/* |
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text = text.replace(/ |
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( // save in $1 |
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\n\n // Starting after a blank line |
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[ ]{0,3} // attacklab: g_tab_width - 1 |
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<! |
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(--[^\r]*?--\s*)+ |
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> |
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[ \t]* |
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(?=\n{2,}) // followed by a blank line |
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) |
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/g,hashElement); |
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*/ |
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text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement); |
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// PHP and ASP-style processor instructions (<?...?> and <%...%>) |
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/* |
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text = text.replace(/ |
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(?: |
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\n\n // Starting after a blank line |
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) |
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( // save in $1 |
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[ ]{0,3} // attacklab: g_tab_width - 1 |
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(?: |
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<([?%]) // $2 |
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[^\r]*? |
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\2> |
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) |
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[ \t]* |
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(?=\n{2,}) // followed by a blank line |
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) |
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/g,hashElement); |
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*/ |
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text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement); |
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// attacklab: Undo double lines (see comment at top of this function) |
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text = text.replace(/\n\n/g,"\n"); |
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return text; |
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} |
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var hashElement = function(wholeMatch,m1) { |
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var blockText = m1; |
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// Undo double lines |
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blockText = blockText.replace(/\n\n/g,"\n"); |
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blockText = blockText.replace(/^\n/,""); |
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// strip trailing blank lines |
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blockText = blockText.replace(/\n+$/g,""); |
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// Replace the element text with a marker ("~KxK" where x is its key) |
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blockText = "\n\n~K" + (g_html_blocks.push(blockText)-1) + "K\n\n"; |
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return blockText; |
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}; |
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var _RunBlockGamut = function(text) { |
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// |
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// These are all the transformations that form block-level |
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// tags like paragraphs, headers, and list items. |
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// |
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text = _DoHeaders(text); |
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// Do Horizontal Rules: |
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var key = hashBlock("<hr />"); |
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text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key); |
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text = text.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,key); |
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text = text.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,key); |
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text = _DoLists(text); |
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text = _DoCodeBlocks(text); |
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text = _DoBlockQuotes(text); |
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// We already ran _HashHTMLBlocks() before, in Markdown(), but that |
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// was to escape raw HTML in the original Markdown source. This time, |
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// we're escaping the markup we've just created, so that we don't wrap |
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// <p> tags around block-level tags. |
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text = _HashHTMLBlocks(text); |
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text = _FormParagraphs(text); |
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return text; |
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}; |
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var _RunSpanGamut = function(text) { |
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// |
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// These are all the transformations that occur *within* block-level |
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// tags like paragraphs, headers, and list items. |
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// |
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text = _DoCodeSpans(text); |
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text = _EscapeSpecialCharsWithinTagAttributes(text); |
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text = _EncodeBackslashEscapes(text); |
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// Process anchor and image tags. Images must come first, |
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// because ![foo][f] looks like an anchor. |
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text = _DoImages(text); |
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text = _DoAnchors(text); |
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// Make links out of things like `<http://example.com/>` |
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// Must come after _DoAnchors(), because you can use < and > |
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// delimiters in inline links like [this](<url>). |
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text = _DoAutoLinks(text); |
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text = _EncodeAmpsAndAngles(text); |
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text = _DoItalicsAndBold(text); |
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// Do hard breaks: |
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text = text.replace(/ +\n/g," <br />\n"); |
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return text; |
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} |
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var _EscapeSpecialCharsWithinTagAttributes = function(text) { |
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// |
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// Within tags -- meaning between < and > -- encode [\ ` * _] so they |
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// don't conflict with their use in Markdown for code, italics and strong. |
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// |
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// Build a regex to find HTML tags and comments. See Friedl's |
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// "Mastering Regular Expressions", 2nd Ed., pp. 200-201. |
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var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi; |
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text = text.replace(regex, function(wholeMatch) { |
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var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g,"$1`"); |
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tag = escapeCharacters(tag,"\\`*_"); |
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return tag; |
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}); |
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return text; |
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} |
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var _DoAnchors = function(text) { |
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// |
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// Turn Markdown link shortcuts into XHTML <a> tags. |
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// |
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// |
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// First, handle reference-style links: [link text] [id] |
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// |
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/* |
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text = text.replace(/ |
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( // wrap whole match in $1 |
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\[ |
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( |
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(?: |
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\[[^\]]*\] // allow brackets nested one level |
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| |
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[^\[] // or anything else |
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)* |
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) |
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\] |
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[ ]? // one optional space |
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(?:\n[ ]*)? // one optional newline followed by spaces |
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\[ |
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(.*?) // id = $3 |
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\] |
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)()()()() // pad remaining backreferences |
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/g,_DoAnchors_callback); |
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*/ |
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text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeAnchorTag); |
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// |
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// Next, inline-style links: [link text](url "optional title") |
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// |
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/* |
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text = text.replace(/ |
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( // wrap whole match in $1 |
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\[ |
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( |
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(?: |
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\[[^\]]*\] // allow brackets nested one level |
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| |
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[^\[\]] // or anything else |
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) |
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) |
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\] |
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\( // literal paren |
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[ \t]* |
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() // no id, so leave $3 empty |
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<?(.*?)>? // href = $4 |
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[ \t]* |
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( // $5 |
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(['"]) // quote char = $6 |
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(.*?) // Title = $7 |
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\6 // matching quote |
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[ \t]* // ignore any spaces/tabs between closing quote and ) |
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)? // title is optional |
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\) |
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) |
|
/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 = []; |
|
|
|
// |
|
// 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> |
|
// |
|
|
|
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 = "<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; |
|
|
|
// 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; |
|
}); |
|
} |
