From 5181f25e5a6e006eb29c293150b9cfa365fbd6ba Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 17 Mar 2019 17:16:56 -0700
Subject: [PATCH] More efficient checking for loose lists.

This fixes a case like commonmark/cmark#284.
---
 lib/blocks.js | 5 ++++-
 lib/node.js   | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/blocks.js b/lib/blocks.js
index 9c735f76..0c6a0295 100644
--- a/lib/blocks.js
+++ b/lib/blocks.js
@@ -85,9 +85,12 @@ var endsWithBlankLine = function(block) {
             return true;
         }
         var t = block.type;
-        if (t === 'list' || t === 'item') {
+        if (!block._lastLineChecked &&
+            (t === 'list' || t === 'item')) {
+            block._lastLineChecked = true;
             block = block._lastChild;
         } else {
+            block._lastLineChecked = true;
             break;
         }
     }
diff --git a/lib/node.js b/lib/node.js
index 4e2bd82a..a0f29be0 100644
--- a/lib/node.js
+++ b/lib/node.js
@@ -76,6 +76,7 @@ var Node = function(nodeType, sourcepos) {
     this._next = null;
     this._sourcepos = sourcepos;
     this._lastLineBlank = false;
+    this._lastLineChecked = false;
     this._open = true;
     this._string_content = null;
     this._literal = null;