From 8e596a765cf323cbd2ba31b15f2939f903d87913 Mon Sep 17 00:00:00 2001
From: Ezio Melotti <ezio.melotti@gmail.com>
Date: Wed, 1 May 2013 16:18:25 +0300
Subject: [PATCH] #17802: Fix an UnboundLocalError in html.parser.  Initial
 tests by Thomas Barlow.

---
 Lib/html/parser.py          |  1 +
 Lib/test/test_htmlparser.py | 14 ++++++++++++++
 Misc/NEWS                   |  3 +++
 3 files changed, 18 insertions(+)

diff --git a/Lib/html/parser.py b/Lib/html/parser.py
index f8ac82834a3..60a322a9494 100644
--- a/Lib/html/parser.py
+++ b/Lib/html/parser.py
@@ -249,6 +249,7 @@ class HTMLParser(_markupbase.ParserBase):
                         if self.strict:
                             self.error("EOF in middle of entity or char ref")
                         else:
+                            k = match.end()
                             if k <= i:
                                 k = n
                             i = self.updatepos(i, i + 1)
diff --git a/Lib/test/test_htmlparser.py b/Lib/test/test_htmlparser.py
index c5d878dca59..b15b6fd4c6c 100644
--- a/Lib/test/test_htmlparser.py
+++ b/Lib/test/test_htmlparser.py
@@ -535,6 +535,20 @@ class HTMLParserTolerantTestCase(HTMLParserStrictTestCase):
         ]
         self._run_check(html, expected)
 
+    def test_EOF_in_charref(self):
+        # see #17802
+        # This test checks that the UnboundLocalError reported in the issue
+        # is not raised, however I'm not sure the returned values are correct.
+        # Maybe HTMLParser should use self.unescape for these
+        data = [
+            ('a&', [('data', 'a&')]),
+            ('a&b', [('data', 'ab')]),
+            ('a&b ', [('data', 'a'), ('entityref', 'b'), ('data', ' ')]),
+            ('a&b;', [('data', 'a'), ('entityref', 'b')]),
+        ]
+        for html, expected in data:
+            self._run_check(html, expected)
+
     def test_unescape_function(self):
         p = self.get_collector()
         self.assertEqual(p.unescape('&#bad;'),'&#bad;')
diff --git a/Misc/NEWS b/Misc/NEWS
index 10f00a466c1..465ca10ff01 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -44,6 +44,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #17802: Fix an UnboundLocalError in html.parser.  Initial tests by
+  Thomas Barlow.
+
 - Issue #17192: Restore the patch for Issue #11729 which was ommitted in
   3.3.1 when updating the bundled version of libffi used by ctypes.  Update
   many libffi files that were missed in 3.3.1's update to libffi-3.0.13.