// // Github Extension (WIP) // ~~strike-through~~ -> <del>strike-through</del> // (function () { var github = function (converter) { return [ { // strike-through // NOTE: showdown already replaced "~" with "~T", so we need to adjust accordingly. type : 'lang', regex : '(~T){2}([^~]+)(~T){2}', replace : function (match, prefix, content, suffix) { return '<del>' + content + '</del>'; } }, { // GFM newline and underscore modifications, happen BEFORE showdown type : 'lang', filter : function (text) { var extractions = {}, imageMarkdownRegex = /^(?:\{(.*?)\})?!(?:\[([^\n\]]*)\])(?:\(([^\n\]]*)\))?$/gim, hashID = 0; function hashId() { return hashID++; } // Extract pre blocks text = text.replace(/<pre>[\s\S]*?<\/pre>/gim, function (x) { var hash = hashId(); extractions[hash] = x; return "{gfm-js-extract-pre-" + hash + "}"; }, 'm'); // Extract code blocks text = text.replace(/```[\s\S]*```/gim, function (x) { var hash = hashId(); extractions[hash] = x; return "{gfm-js-extract-code-" + hash + "}"; }, 'm'); //prevent foo_bar and foo_bar_baz from ending up with an italic word in the middle text = text.replace(/(^(?! {4}|\t)(?!__)\w+_\w+_\w[\w_]*)/gm, function (x) { return x.replace(/_/gm, '\\_'); }); text = text.replace(/\{gfm-js-extract-code-([0-9]+)\}/gm, function (x, y) { return extractions[y]; }); // in very clear cases, let newlines become <br /> tags text = text.replace(/^[\w\<\"\'][^\n]*\n+/gm, function (x) { return x.match(/\n{2}/) ? x : x.trim() + " \n"; }); // better URL support, but no title support text = text.replace(imageMarkdownRegex, function (match, key, alt, src) { if (src) { return '<img src="' + src + '" alt="' + alt + '" />'; } return ''; }); text = text.replace(/\{gfm-js-extract-pre-([0-9]+)\}/gm, function (x, y) { return "\n\n" + extractions[y]; }); return text; } }, { // GFM autolinking & custom image handling, happens AFTER showdown type : 'html', filter : function (text) { var refExtractions = {}, preExtractions = {}, hashID = 0; function hashId() { return hashID++; } // Extract pre blocks text = text.replace(/<(pre|code)>[\s\S]*?<\/(\1)>/gim, function (x) { var hash = hashId(); preExtractions[hash] = x; return "{gfm-js-extract-pre-" + hash + "}"; }, 'm'); // filter out def urls // from Marked https://github.com/chjj/marked/blob/master/lib/marked.js#L24 text = text.replace(/^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/gmi, function (x) { var hash = hashId(); refExtractions[hash] = x; return "{gfm-js-extract-ref-url-" + hash + "}"; }); // match a URL // adapted from https://gist.github.com/jorilallo/1283095#L158 // and http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript text = text.replace(/(\]\(|\]|\[|<a[^\>]*?\>)?https?\:\/\/[^"\s\<\>]*[^.,;'">\:\s\<\>\)\]\!]/gmi, function (wholeMatch, lookBehind, matchIndex) { // Check we are not inside an HTML tag var left = text.slice(0, matchIndex), right = text.slice(matchIndex); if ((left.match(/<[^>]+$/) && right.match(/^[^>]*>/)) || lookBehind) { return wholeMatch; } // If we have a matching lookBehind, this is a failure, else wrap the match in <a> tag return lookBehind ? wholeMatch : "<a href='" + wholeMatch + "'>" + wholeMatch + "</a>"; }); // replace extractions text = text.replace(/\{gfm-js-extract-pre-([0-9]+)\}/gm, function (x, y) { return preExtractions[y]; }); text = text.replace(/\{gfm-js-extract-ref-url-([0-9]+)\}/gi, function (x, y) { return "\n\n" + refExtractions[y]; }); return text; } } ]; }; // Client-side export if (typeof window !== 'undefined' && window.Showdown && window.Showdown.extensions) { window.Showdown.extensions.github = github; } // Server-side export if (typeof module !== 'undefined') module.exports = github; }());