Fix _handle_single_tag_end()'s token search order (fixes #74)

mwparserfromhell/parser/tokenizer.c

@@ -1899,7 +1899,7 @@ static PyObject* Tokenizer_handle_single_tag_end(Tokenizer* self)
     int is_instance;
 
     len = PyList_GET_SIZE(self->topstack->stack);
-    for (index = 0; index < len; index++) {
+    for (index = len - 1; index >= 0; index--) {
         token = PyList_GET_ITEM(self->topstack->stack, index);
         is_instance = PyObject_IsInstance(token, TagCloseOpen);
         if (is_instance == -1)

mwparserfromhell/parser/tokenizer.py

@@ -21,6 +21,7 @@
 # SOFTWARE.
 
 from __future__ import unicode_literals
+from itertools import izip
 from math import log
 import re
 
@@ -751,11 +752,12 @@ class Tokenizer(object):
 
     def _handle_single_tag_end(self):
         """Handle the stream end when inside a single-supporting HTML tag."""
-        gen = enumerate(self._stack)
+        stack = self._stack
+        gen = izip(xrange(len(stack) - 1, -1, -1), reversed(stack))
         index = next(i for i, t in gen if isinstance(t, tokens.TagCloseOpen))
-        padding = self._stack[index].padding
+        padding = stack[index].padding
         token = tokens.TagCloseSelfclose(padding=padding, implicit=True)
-        self._stack[index] = token
+        stack[index] = token
         return self._pop()
 
     def _really_parse_tag(self):

tests/tokenizer/tags.mwtest

@@ -124,6 +124,13 @@ output: [TagOpenOpen(), Text(text="ref"), TagAttrStart(pad_first=" ", pad_before
 
 ---
 
+name:   nested_tag_selfclosing
+label:  a tag nested within the attributes of another; outer tag implicitly self-closing
+input:  "<li <b></b></li>"
+output: [TagOpenOpen(), Text(text="li"), TagAttrStart(pad_first=" ", pad_before_eq="", pad_after_eq=""), TagOpenOpen(), Text(text="b"), TagCloseOpen(padding=""), TagOpenClose(), Text(text="b"), TagCloseClose(), Text(text="</li"), TagCloseSelfclose(padding="", implicit=True)]
+
+---
+
 name:   invalid_space_begin_open
 label:  invalid tag: a space at the beginning of the open tag
 input:  "< ref>test</ref>"