Add reset support to TOC extension.

Now, whenever the TOC extensiuon is loaded, the Markdown class instance
will always have a toc attribute (md.toc). Calling md.reset() will also
reset the toc attribute which defaults to an empty string.

Author: waylan

markdown/extensions/toc.py

@@ -234,6 +234,9 @@ def __init__(self, *args, **kwargs):
         super(TocExtension, self).__init__(*args, **kwargs)
 
     def extendMarkdown(self, md, md_globals):
+        md.registerExtension(self)
+        self.md = md
+        self.reset()
         tocext = self.TreeProcessorClass(md)
         tocext.config = self.getConfigs()
         # Headerid ext is set to '>prettify'. With this set to '_end',
@@ -243,6 +246,9 @@ def extendMarkdown(self, md, md_globals):
         # to redefine ids after toc is created. But we do want toc prettified.
         md.treeprocessors.add("toc", tocext, "_end")
 
+    def reset(self):
+        self.md.toc = ''
+
 
 def makeExtension(*args, **kwargs):
     return TocExtension(*args, **kwargs)

tests/test_extensions.py

@@ -733,6 +733,25 @@ def testNoMarker(self):
             '</div>\n'
         )
 
+    def testReset(self):
+        """ Test TOC Reset. """
+        self.assertEqual(self.md.toc, '')
+        self.md.convert('# Header 1\n\n## Header 2')
+        self.assertEqual(
+            self.md.toc,
+            '<div class="toc">\n'
+              '<ul>\n'                                             # noqa
+                '<li><a href="#header-1">Header 1</a>'             # noqa
+                  '<ul>\n'                                         # noqa
+                    '<li><a href="#header-2">Header 2</a></li>\n'  # noqa
+                  '</ul>\n'                                        # noqa
+                '</li>\n'                                          # noqa
+              '</ul>\n'                                            # noqa
+            '</div>\n'
+        )
+        self.md.reset()
+        self.assertEqual(self.md.toc, '')
+
 
 class TestSmarty(unittest.TestCase):
     def setUp(self):