md_tw.py: Add TWBlockLexer.parse_def_links.

* md_tw.py
(TWBlockLexer.parse_def_links): New method.
* tests/test_md_tw.py
(TestTWBlockLexer.test_parse_def_links): New test.
* tests/data/blexer-def-links.md: New file.

3 files changed, 62 insertions, 0 deletions

diff --git a/md_tw.py b/md_tw.py
index 19b5b30..7f9b578 100644
--- a/md_tw.py
+++ b/md_tw.py
@@ -148,6 +148,17 @@ class TWBlockLexer(mistune.BlockLexer):
             'spaces': len(quote)
             })
 
+    def parse_def_links(self, m):
+        key = self._keyify(m.group(1))
+        self.def_links[key] = {
+            'link': m.group(2),
+            'title': m.group(3),
+        }
+        self.tokens.append({
+            'type': 'def_links',
+            'text': m.group(0)
+            })
+
 
 class TWInlineLexer(mistune.InlineLexer):
     """Text Wrap Inline level lexer for inline gramars."""
diff --git a/tests/data/blexer-def-links.md b/tests/data/blexer-def-links.md
new file mode 100644
index 0000000..c09e417
--- /dev/null
+++ b/tests/data/blexer-def-links.md
@@ -0,0 +1,34 @@
+This is [an example](http://example.com/ "Title") inline link.
+
+[This link](http://example.net/) has no title attribute.
+
+See my [About](/about/) page for details.
+
+This is [Bob][bob]'s web space.
+
+This is [Alice][alice]'s web space.
+
+[bob]: http://bob.name/ "Bob's home"
+[alice]: <http://alice.name/> "Alice's home"
+
+Some foo[bar].
+
+[bar]: http://bar.beer/  "Foo Bar Beer"
+
+Visit [GNU.org][].
+
+[GNU.org]: http://gnu.org
+
+John Gruber gets 10 times more traffic from [Google][1] than from
+[Yahoo][2] or [MSN][3].
+
+  [1]: http://google.com/        "Google"
+  [2]: http://search.yahoo.com/  "Yahoo Search"
+  [3]: http://search.msn.com/    "MSN Search"
+
+John Gruber gets 10 times more traffic from [Google][] than from
+[Yahoo][] or [MSN][].
+
+  [google]: http://google.com/        "Google"
+  [yahoo]:  http://search.yahoo.com/  "Yahoo Search"
+  [msn]:    http://search.msn.com/    "MSN Search"
diff --git a/tests/test_md_tw.py b/tests/test_md_tw.py
index 4b78dcd..467caaf 100644
--- a/tests/test_md_tw.py
+++ b/tests/test_md_tw.py
@@ -463,6 +463,23 @@ class TestTWBlockLexer(object):
             }
         tokens = process(tokens)
 
+    def test_parse_def_links(self):
+        tokens = self._parse('blexer-def-links.md')
+
+        expected_dls = [
+            '[bob]: http://bob.name/ "Bob\'s home"\n',
+            '[alice]: <http://alice.name/> "Alice\'s home"\n\n',
+            '[bar]: http://bar.beer/  "Foo Bar Beer"\n\n',
+            '[GNU.org]: http://gnu.org\n\n',
+            '  [1]: http://google.com/        "Google"\n',
+            '  [2]: http://search.yahoo.com/  "Yahoo Search"\n',
+            '  [3]: http://search.msn.com/    "MSN Search"\n\n',
+            '  [google]: http://google.com/        "Google"\n',
+            '  [yahoo]:  http://search.yahoo.com/  "Yahoo Search"\n',
+            '  [msn]:    http://search.msn.com/    "MSN Search"',
+            ]
+        self._validate(tokens, 'def_links', expected_dls)
+
     def teardown(self):
         pass