From d8b3284246af371162f586401994c46e321c6210 Mon Sep 17 00:00:00 2001
From: Crozzers <captaincrozzers@gmail.com>
Date: Wed, 17 Dec 2025 23:23:57 +0000
Subject: [PATCH 1/2] Fix unbound local error in GFM emphasis processing (#666)

---
 lib/markdown2.py                         | 20 +++++++++++---------
 test/tm-cases/gfm_emphasis_issue666.html |  1 +
 test/tm-cases/gfm_emphasis_issue666.text |  1 +
 3 files changed, 13 insertions(+), 9 deletions(-)
 create mode 100644 test/tm-cases/gfm_emphasis_issue666.html
 create mode 100644 test/tm-cases/gfm_emphasis_issue666.text

diff --git a/lib/markdown2.py b/lib/markdown2.py
index 6af7c929..8d073cad 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -2786,17 +2786,19 @@ def has_middle(
         if len(open_syntax) < len(syntax) and opens:
             # expand the em span to the left, meaning we're covering additional chars.
             # check we don't cross an existing span border
-            if not self.body_crosses_span_borders(opens[-1], open):
-                middle = open
+            if self.body_crosses_span_borders(opens[-1], open):
+                return False
 
-                open = opens.pop(-1)
-                open_offset = unused_opens.pop(open, 0)
-                open_syntax = open.group(1)[open_offset:]
+            middle = open
 
-                if len(open_syntax) == len(syntax):
-                    # if it turns out the previous open is a perfect match then ignore the middle part
-                    # eg: **foo*bar**
-                    middle = None
+            open = opens.pop(-1)
+            open_offset = unused_opens.pop(open, 0)
+            open_syntax = open.group(1)[open_offset:]
+
+            if len(open_syntax) == len(syntax):
+                # if it turns out the previous open is a perfect match then ignore the middle part
+                # eg: **foo*bar**
+                middle = None
         elif len(open_syntax) > len(syntax) and unused_closes:
             # check if there is a previous closing delim run in the current body
             # since this is already within the body we don't need to do a cross-span border check
diff --git a/test/tm-cases/gfm_emphasis_issue666.html b/test/tm-cases/gfm_emphasis_issue666.html
new file mode 100644
index 00000000..8743e4f1
--- /dev/null
+++ b/test/tm-cases/gfm_emphasis_issue666.html
@@ -0,0 +1 @@
+<p>*<a href="https://example.com/"><em>test</em>*</a></p>
diff --git a/test/tm-cases/gfm_emphasis_issue666.text b/test/tm-cases/gfm_emphasis_issue666.text
new file mode 100644
index 00000000..3ac0deb3
--- /dev/null
+++ b/test/tm-cases/gfm_emphasis_issue666.text
@@ -0,0 +1 @@
+*[*test**](https://example.com/)
\ No newline at end of file

From de9e432d051a326a0ea127c8385b715f184baa90 Mon Sep 17 00:00:00 2001
From: Crozzers <captaincrozzers@gmail.com>
Date: Wed, 17 Dec 2025 23:28:05 +0000
Subject: [PATCH 2/2] Update changelog

---
 CHANGES.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGES.md b/CHANGES.md
index c1c77f13..e1c9c958 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,6 +6,7 @@
 - [pull #640] Fix code friendly extra stopping other syntax being processed (#638)
 - [pull #644] Fix a number of em/strong issues (#641, #642, #643)
 - [pull #659] Fix a number of safemode issues (#647)
+- [pull #665] Rewrite emphasis and strong processing to be more GFM compliant
 
 
 ## python-markdown2 2.5.4