rough implementation of task lists. see #107 #111.

Author: chjj

lib/marked.js

@@ -22,6 +22,7 @@ var block = {
   list: /^( *)(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
   html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
   def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
+  task: noop,
   table: noop,
   paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
   text: /^[^\n]+/
@@ -75,6 +76,7 @@ block.normal = merge({}, block);
  */
 
 block.gfm = merge({}, block.normal, {
+  task: /^(\s*\[[x ]\][^\n]+\n)+\n*/,
   fences: /^ *(`{3,}|~{3,}) *(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/,
   paragraph: /^/
 });
@@ -375,6 +377,33 @@ Lexer.prototype.token = function(src, top, bq) {
       continue;
     }
 
+    // task (gfm)
+    if (top && (cap = this.rules.task.exec(src)) {
+      src = src.substring(cap[0].length);
+
+      this.tokens.push({
+        type: 'task_list_start'
+      });
+
+      cap[0] = cap[0].replace(/^\s+|\s+$/g, '');
+      cap = cap[0].split(/\n+/);
+
+      i = 0;
+      l = cap.length;
+
+      for (; i < l; i++) {
+        this.tokens.push({
+          type: 'task_item',
+          checked: /^\s*\[x\]/.test(cap[i]),
+          text: cap[i].replace(/^\s*\[[x ]\]\s*/, '')
+        });
+      }
+
+      this.tokens.push({
+        type: 'task_list_end'
+      });
+    }
+
     // table (gfm)
     if (top && (cap = this.rules.table.exec(src))) {
       src = src.substring(cap[0].length);
@@ -980,6 +1009,25 @@ Parser.prototype.tok = function() {
         this.token.lang,
         this.token.escaped);
     }
+    case 'task_list_start': {
+      var body = ''
+        , i = 1;
+
+      while (this.next().type !== 'task_list_end') {
+        body += '<li class="task-list-item"><label>'
+          + '<input type="checkbox"'
+          + ' class="task-list-item-checkbox"
+          + ' data-item-index="' + (i++) + '"'
+          + ' data-item-complete="' + (this.token.checked ? 1 : 0) + '"'
+          + ' ' + (this.token.disabled ? 'disabled=""' + '') + '>'
+          + ' ' + this.inline.output(this.token.text)
+          + '</label></li>';
+      }
+
+      return '<ul class="task-list">'
+        + body
+        + '</ul>';
+    }
     case 'table': {
       var header = ''
         , body = ''