From 93544ee4bfbea1cc72f98bf1986d5823664c9237 Mon Sep 17 00:00:00 2001
From: Alex Kocharin <alex@kocharin.ru>
Date: Wed, 30 Nov 2016 15:44:22 +0300
Subject: [PATCH] Fenced code block info string should not contain fence marker

Fix https://github.com/markdown-it/markdown-it/issues/301
---
 lib/rules_block/fence.js                        |  2 +-
 test/fixtures/markdown-it/commonmark_extras.txt | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/rules_block/fence.js b/lib/rules_block/fence.js
index a02bd5f..d9f6bb7 100644
--- a/lib/rules_block/fence.js
+++ b/lib/rules_block/fence.js
@@ -28,7 +28,7 @@ module.exports = function fence(state, startLine, endLine, silent) {
   markup = state.src.slice(mem, pos);
   params = state.src.slice(pos, max);
 
-  if (params.indexOf('`') >= 0) { return false; }
+  if (params.indexOf(String.fromCharCode(marker)) >= 0) { return false; }
 
   // Since start is found, we can report success here in validation mode
   if (silent) { return true; }
diff --git a/test/fixtures/markdown-it/commonmark_extras.txt b/test/fixtures/markdown-it/commonmark_extras.txt
index 3851a5d..41181c9 100644
--- a/test/fixtures/markdown-it/commonmark_extras.txt
+++ b/test/fixtures/markdown-it/commonmark_extras.txt
@@ -149,6 +149,16 @@ bar
 </ul>
 .
 
+Info string in fenced code block can't contain marker used for the fence
+.
+~~~test~
+
+~~~test`
+.
+<p>~~~test~</p>
+<pre><code class="test`"></code></pre>
+.
+
 Coverage. Directive can terminate paragraph.
 .
 a