Fix hr recursion issue (#535)

HRProcessor tried to access a member variable after recursively calling itself. In certain situations HRProcessor will try to access its member variable containing its match, but it will not be the same match that call in the stack expected. This is easily fixed by storing the match locally *before* doing any recursive work.

Author: facelessuser

markdown/blockprocessors.py

@@ -493,15 +493,16 @@ def test(self, parent, block):
 
  def run(self, parent, blocks):
  block = blocks.pop(0)
+ match = self.match
  # Check for lines in block before hr.
- prelines = block[:self.match.start()].rstrip('\n')
+ prelines = block[:match.start()].rstrip('\n')
  if prelines:
  # Recursively parse lines before hr so they get parsed first.
  self.parser.parseBlocks(parent, [prelines])
  # create hr
  util.etree.SubElement(parent, 'hr')
  # check for lines in block after hr.
- postlines = block[self.match.end():].lstrip('\n')
+ postlines = block[match.end():].lstrip('\n')
  if postlines:
  # Add lines after hr to master blocks for later parsing.
  blocks.insert(0, postlines)

tests/misc/blockquote-hr.html

@@ -13,4 +13,13 @@
 Even a lazy line.</p>
 <hr />
 <p>The last line.</p>
+</blockquote>
+<p>foo</p>
+<blockquote>
+<p>bar</p>
+<hr />
+</blockquote>
+<hr />
+<blockquote>
+<p>baz</p>
 </blockquote>

tests/misc/blockquote-hr.txt

@@ -19,3 +19,9 @@ Even a lazy line.
 > ---
 
 > The last line.
+
+foo
+> bar
+> ***
+---
+> baz