From 5ee12763465d123a313d43fc0fb497636f727d34 Mon Sep 17 00:00:00 2001
From: Waylan Limberg <waylan@gmail.com>
Date: Wed, 25 Aug 2010 11:06:17 -0400
Subject: Fixed Ticket 70 and added a test.  Footnote references whithout a
 coresponding definition no longer raise an error.  They now pass through as
 plain text - which is the same behavior as PHP Markdown Extra. Thanks for the
 report Benjamin Bach.

---
 markdown/extensions/footnotes.py     | 17 ++++++++++-------
 tests/extensions/extra/footnote.html |  1 +
 tests/extensions/extra/footnote.txt  |  2 ++
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/markdown/extensions/footnotes.py b/markdown/extensions/footnotes.py
index 2bdabe9..644e89f 100644
--- a/markdown/extensions/footnotes.py
+++ b/markdown/extensions/footnotes.py
@@ -261,14 +261,17 @@ class FootnotePattern(markdown.inlinepatterns.Pattern):
         self.footnotes = footnotes
 
     def handleMatch(self, m):
-        sup = etree.Element("sup")
-        a = etree.SubElement(sup, "a")
         id = m.group(2)
-        sup.set('id', self.footnotes.makeFootnoteRefId(id))
-        a.set('href', '#' + self.footnotes.makeFootnoteId(id))
-        a.set('rel', 'footnote')
-        a.text = str(self.footnotes.footnotes.index(id) + 1)
-        return sup
+        if id in self.footnotes.footnotes.keys():
+            sup = etree.Element("sup")
+            a = etree.SubElement(sup, "a")
+            sup.set('id', self.footnotes.makeFootnoteRefId(id))
+            a.set('href', '#' + self.footnotes.makeFootnoteId(id))
+            a.set('rel', 'footnote')
+            a.text = unicode(self.footnotes.footnotes.index(id) + 1)
+            return sup
+        else:
+            return None
 
 
 class FootnoteTreeprocessor(markdown.treeprocessors.Treeprocessor):
diff --git a/tests/extensions/extra/footnote.html b/tests/extensions/extra/footnote.html
index 6556dab..d7d8b92 100644
--- a/tests/extensions/extra/footnote.html
+++ b/tests/extensions/extra/footnote.html
@@ -1,4 +1,5 @@
 <p>This is the body with a footnote<sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> or two<sup id="fnref:2"><a href="#fn:2" rel="footnote">2</a></sup> or more<sup id="fnref:3"><a href="#fn:3" rel="footnote">3</a></sup> <sup id="fnref:4"><a href="#fn:4" rel="footnote">4</a></sup>.</p>
+<p>Also a reference that does not exist[^5].</p>
 <div class="footnote">
 <hr />
 <ol>
diff --git a/tests/extensions/extra/footnote.txt b/tests/extensions/extra/footnote.txt
index 07188d0..9f89397 100644
--- a/tests/extensions/extra/footnote.txt
+++ b/tests/extensions/extra/footnote.txt
@@ -1,5 +1,7 @@
 This is the body with a footnote[^1] or two[^2] or more[^3] [^4].
 
+Also a reference that does not exist[^5].
+
 [^1]: Footnote that ends with a list:
 
     * item 1
-- 
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