md_tw.py: Add TWBlockLexer.parse_lheading.

* md_tw.py
(TWBlockLexer.parse_lheading): New method.
* tests/test_md_tw.py
(TestTWBlockLexer.test_parse_lheading): New method.
* tests/data/blexer-lheading.md: New file.

3 files changed, 32 insertions, 0 deletions

diff --git a/md_tw.py b/md_tw.py
index 64c9ced..10bd0a8 100644
--- a/md_tw.py
+++ b/md_tw.py
@@ -59,6 +59,14 @@ class TWBlockLexer(mistune.BlockLexer):
             'text': m.group(0),
         })
 
+    def parse_lheading(self, m):
+        """Parse setext heading."""
+        self.tokens.append({
+            'type': 'heading',
+            'level': 1 if m.group(2) == '=' else 2,
+            'text': m.group(0),
+        })
+
 
 class TWInlineLexer(mistune.InlineLexer):
     """Text Wrap Inline level lexer for inline gramars."""
diff --git a/tests/data/blexer-lheading.md b/tests/data/blexer-lheading.md
new file mode 100644
index 0000000..13a5160
--- /dev/null
+++ b/tests/data/blexer-lheading.md
@@ -0,0 +1,13 @@
+Milky Chance
+============
+
+Clemens, Phillipp, Antonio
+
+Flashed
+-------
+
+Lost our mind.
+
+### Junk Mind
+
+In the junkyard.
diff --git a/tests/test_md_tw.py b/tests/test_md_tw.py
index af2ce45..a71c191 100644
--- a/tests/test_md_tw.py
+++ b/tests/test_md_tw.py
@@ -79,6 +79,17 @@ class TestTWBlockLexer(object):
 
         self._validate(tokens, 'heading', expected_hs)
 
+    def test_parse_lheading(self):
+        tokens = self._parse('blexer-lheading.md')
+
+        expected_lhs = [
+            'Milky Chance\n============\n\n',
+            'Flashed\n-------\n\n',
+            '### Junk Mind\n\n',
+            ]
+
+        self._validate(tokens, 'heading', expected_lhs)
+
     def teardown(self):
         pass