Allow tabs inside GFM tables

lib/rules_block/table.js

@@ -2,6 +2,8 @@
 
 'use strict';
 
+var isSpace = require('../common/utils').isSpace;
+
 
 function getLine(state, line) {
   var pos = state.bMarks[line] + state.blkIndent,
@@ -64,16 +66,25 @@ module.exports = function table(state, startLine, endLine, silent) {
 
   if (state.sCount[nextLine] < state.blkIndent) { return false; }
 
-  // first character of the second line should be '|' or '-'
+  // first character of the second line should be '|', '-', ':',
+  // and no other characters are allowed but spaces;
+  // basically, this is the equivalent of /^[-:|][-:|\s]*$/ regexp
 
   pos = state.bMarks[nextLine] + state.tShift[nextLine];
   if (pos >= state.eMarks[nextLine]) { return false; }
 
-  ch = state.src.charCodeAt(pos);
+  ch = state.src.charCodeAt(pos++);
   if (ch !== 0x7C/* | */ && ch !== 0x2D/* - */ && ch !== 0x3A/* : */) { return false; }
 
+  while (pos < state.eMarks[nextLine]) {
+    ch = state.src.charCodeAt(pos);
+
+    if (ch !== 0x7C/* | */ && ch !== 0x2D/* - */ && ch !== 0x3A/* : */ && !isSpace(ch)) { return false; }
+
+    pos++;
+  }
+
   lineText = getLine(state, startLine + 1);
-  if (!/^[-:| ]+$/.test(lineText)) { return false; }
 
   columns = lineText.split('|');
   aligns = [];

test/fixtures/markdown-it/tables.txt

@@ -225,6 +225,29 @@ bar|bar</p>
 .
 
 
+Allow tabs as a separator on 2nd line
+.
+|	foo	|	bar	|
+|	---	|	---	|
+|	baz	|	quux	|
+.
+<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>quux</td>
+</tr>
+</tbody>
+</table>
+.
+
+
 Should terminate paragraph:
 .
 paragraph