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.

1 files changed, 11 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."""