Support extensions for code blocks

Author: BenHall

lib/marked.js

@@ -13,6 +13,7 @@
 var block = {
   newline: /^\n+/,
   code: /^( {4}[^\n]+\n*)+/,
+  attr: /^{{([^}]*)}}/,
   fences: noop,
   hr: /^( *[-*_]){3,} *(?:\n+|$)/,
   heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
@@ -75,7 +76,7 @@ block.normal = merge({}, block);
  */
 
 block.gfm = merge({}, block.normal, {
-  fences: /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]*?)\s*\1 *(?:\n+|$)/,
+  fences: /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]*?)\s*\1 *(?:\n+|{{([^}]*)}})/,
   paragraph: /^/,
   heading: /^ *(#{1,6}) +([^\n]+?) *#* *(?:\n+|$)/
 });
@@ -189,7 +190,8 @@ Lexer.prototype.token = function(src, top, bq) {
       this.tokens.push({
         type: 'code',
         lang: cap[2],
-        text: cap[3] || ''
+        text: cap[3] || '',
+        attr: cap[4]
       });
       continue;
     }
@@ -769,7 +771,7 @@ function Renderer(options) {
   this.options = options || {};
 }
 
-Renderer.prototype.code = function(code, lang, escaped) {
+Renderer.prototype.code = function(code, lang, escaped, attr) {
   if (this.options.highlight) {
     var out = this.options.highlight(code, lang);
     if (out != null && out !== code) {
@@ -779,9 +781,15 @@ Renderer.prototype.code = function(code, lang, escaped) {
   }
 
   if (!lang) {
-    return '<pre><code>'
-      + (escaped ? code : escape(code, true))
-      + '\n</code></pre>';
+    if(attr) {
+      return '<pre><code class="' + attr + '">'
+        + (escaped ? code : escape(code, true))
+        + '\n</code></pre>';
+    } else {
+      return '<pre><code>'
+        + (escaped ? code : escape(code, true))
+        + '\n</code></pre>';
+    }
   }
 
   return '<pre><code class="'
@@ -1000,7 +1008,8 @@ Parser.prototype.tok = function() {
     case 'code': {
       return this.renderer.code(this.token.text,
         this.token.lang,
-        this.token.escaped);
+        this.token.escaped,
+        this.token.attr);
     }
     case 'table': {
       var header = ''