From aee45c3daed7c1c8c6bf31731f28c429eeb1669c Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Fri, 2 Feb 2024 15:03:50 -0700
Subject: [PATCH] Fix title-related backtracking with empty string

Fixes #281
---
 lib/inlines.js      | 7 +++----
 test/regression.txt | 8 ++++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/lib/inlines.js b/lib/inlines.js
index dd30bd4f..1ecf8eef 100644
--- a/lib/inlines.js
+++ b/lib/inlines.js
@@ -884,7 +884,6 @@ var parseReference = function(s, refmap) {
         title = this.parseLinkTitle();
     }
     if (title === null) {
-        title = "";
         // rewind before spaces
         this.pos = beforetitle;
     }
@@ -892,13 +891,13 @@ var parseReference = function(s, refmap) {
     // make sure we're at line end:
     var atLineEnd = true;
     if (this.match(reSpaceAtEndOfLine) === null) {
-        if (title === "") {
+        if (title === null) {
             atLineEnd = false;
         } else {
             // the potential title we found is not at the line end,
             // but it could still be a legal link reference if we
             // discard the title
-            title = "";
+            title = null;
             // rewind before spaces
             this.pos = beforetitle;
             // and instead check if the link URL is at the line end
@@ -919,7 +918,7 @@ var parseReference = function(s, refmap) {
     }
 
     if (!refmap[normlabel]) {
-        refmap[normlabel] = { destination: dest, title: title };
+        refmap[normlabel] = { destination: dest, title: title === null ? "" : title };
     }
     return this.pos - startpos;
 };
diff --git a/test/regression.txt b/test/regression.txt
index da235fb2..aea81378 100644
--- a/test/regression.txt
+++ b/test/regression.txt
@@ -484,3 +484,11 @@ x <- 1
 <p>&amp;para</p>
 <p>¶</p>
 ````````````````````````````````
+
+#281
+```````````````````````````````` example
+[test]:example
+""third [test]
+.
+<p>&quot;&quot;third <a href="example">test</a></p>
+````````````````````````````````
\ No newline at end of file