Fix the lost tail issue in inlineprocessors.

See #253. Prior to this patch, if any inline processors returned an element
with a tail, the tail would end up empty. This resolves that issue and will
allow for #253 to be fixed. Thanks to @facelessuser for the work on this.

3 files changed, 40 insertions, 23 deletions

diff --git a/markdown/inlinepatterns.py b/markdown/inlinepatterns.py
index eaf4040..e990418 100644
--- a/markdown/inlinepatterns.py
+++ b/markdown/inlinepatterns.py
@@ -156,7 +156,7 @@ class Pattern(object):
 
         """
         self.pattern = pattern
-        self.compiled_re = re.compile("^(.*?)%s(.*?)$" % pattern, 
+        self.compiled_re = re.compile("^(.*?)%s(.*?)$" % pattern,
                                       re.DOTALL | re.UNICODE)
 
         # Api for Markdown to pass safe_mode into instance
@@ -210,7 +210,7 @@ class Pattern(object):
                     return value
                 else:
                     # An etree Element - return text content only
-                    return ''.join(itertext(value)) 
+                    return ''.join(itertext(value))
         return util.INLINE_PLACEHOLDER_RE.sub(get_stash, text)
 
 
@@ -228,7 +228,7 @@ class EscapePattern(Pattern):
         if char in self.markdown.ESCAPED_CHARS:
             return '%s%s%s' % (util.STX, ord(char), util.ETX)
         else:
-            return None 
+            return None
 
 
 class SimpleTagPattern(Pattern):
@@ -300,7 +300,7 @@ class HtmlPattern(Pattern):
                     return self.markdown.serializer(value)
                 except:
                     return '\%s' % value
-            
+
         return util.INLINE_PLACEHOLDER_RE.sub(get_stash, text)
 
 
@@ -320,7 +320,7 @@ class LinkPattern(Pattern):
             el.set("href", "")
 
         if title:
-            title = dequote(self.unescape(title)) 
+            title = dequote(self.unescape(title))
             el.set("title", title)
         return el
 
@@ -344,19 +344,19 @@ class LinkPattern(Pattern):
         if not self.markdown.safeMode:
             # Return immediately bipassing parsing.
             return url
-        
+
         try:
             scheme, netloc, path, params, query, fragment = url = urlparse(url)
         except ValueError: #pragma: no cover
             # Bad url - so bad it couldn't be parsed.
             return ''
-        
+
         locless_schemes = ['', 'mailto', 'news']
         allowed_schemes = locless_schemes + ['http', 'https', 'ftp', 'ftps']
         if scheme not in allowed_schemes:
             # Not a known (allowed) scheme. Not safe.
             return ''
-            
+
         if netloc == '' and scheme not in locless_schemes: #pragma: no cover
             # This should not happen. Treat as suspect.
             return ''
diff --git a/markdown/treeprocessors.py b/markdown/treeprocessors.py
index a82141a..d3ee207 100644
--- a/markdown/treeprocessors.py
+++ b/markdown/treeprocessors.py
@@ -34,8 +34,8 @@ class Treeprocessor(util.Processor):
     def run(self, root):
         """
         Subclasses of Treeprocessor should implement a `run` method, which
-        takes a root ElementTree. This method can return another ElementTree 
-        object, and the existing root ElementTree will be replaced, or it can 
+        takes a root ElementTree. This method can return another ElementTree
+        object, and the existing root ElementTree will be replaced, or it can
         modify the current tree and return None.
         """
         pass #pragma: no cover
@@ -71,7 +71,7 @@ class InlineProcessor(Treeprocessor):
         * index: index, from which we start search
 
         Returns: placeholder id and string index, after the found placeholder.
-        
+
         """
         m = self.__placeholder_re.search(data, index)
         if m:
@@ -129,11 +129,10 @@ class InlineProcessor(Treeprocessor):
             text = subnode.tail
             subnode.tail = None
 
-        childResult = self.__processPlaceholders(text, subnode)
+        childResult = self.__processPlaceholders(text, subnode, isText)
 
         if not isText and node is not subnode:
             pos = list(node).index(subnode)
-            node.remove(subnode)
         else:
             pos = 0
 
@@ -141,7 +140,7 @@ class InlineProcessor(Treeprocessor):
         for newChild in childResult:
             node.insert(pos, newChild)
 
-    def __processPlaceholders(self, data, parent):
+    def __processPlaceholders(self, data, parent, isText=True):
         """
         Process string with placeholders and generate ElementTree tree.
 
@@ -151,7 +150,7 @@ class InlineProcessor(Treeprocessor):
         * parent: Element, which contains processing inline data
 
         Returns: list with ElementTree elements with applied inline patterns.
-        
+
         """
         def linkText(text):
             if text:
@@ -160,6 +159,11 @@ class InlineProcessor(Treeprocessor):
                         result[-1].tail += text
                     else:
                         result[-1].tail = text
+                elif not isText:
+                    if parent.tail:
+                        parent.tail += text
+                    else:
+                        parent.tail = text
                 else:
                     if parent.text:
                         parent.text += text
@@ -183,7 +187,7 @@ class InlineProcessor(Treeprocessor):
                         for child in [node] + list(node):
                             if child.tail:
                                 if child.tail.strip():
-                                    self.__processElementText(node, child,False)
+                                    self.__processElementText(node, child, False)
                             if child.text:
                                 if child.text.strip():
                                     self.__processElementText(child, child)
@@ -240,7 +244,7 @@ class InlineProcessor(Treeprocessor):
                 # We need to process current node too
                 for child in [node] + list(node):
                     if not isString(node):
-                        if child.text: 
+                        if child.text:
                             child.text = self.__handleInline(child.text,
                                                             patternIndex + 1)
                         if child.tail:
@@ -288,11 +292,10 @@ class InlineProcessor(Treeprocessor):
                 if child.tail:
                     tail = self.__handleInline(child.tail)
                     dumby = util.etree.Element('d')
-                    tailResult = self.__processPlaceholders(tail, dumby)
-                    if dumby.text:
-                        child.tail = dumby.text
-                    else:
-                        child.tail = None
+                    child.tail = None
+                    tailResult = self.__processPlaceholders(tail, dumby, False)
+                    if dumby.tail:
+                        child.tail = dumby.tail
                     pos = list(currElement).index(child) + 1
                     tailResult.reverse()
                     for newChild in tailResult:
@@ -304,7 +307,7 @@ class InlineProcessor(Treeprocessor):
                 if self.markdown.enable_attributes:
                     if element.text and isString(element.text):
                         element.text = \
-                            inlinepatterns.handleAttributes(element.text, 
+                            inlinepatterns.handleAttributes(element.text,
                                                                     element)
                 i = 0
                 for newChild in lst:
diff --git a/tests/test_apis.py b/tests/test_apis.py
index 8cb2c66..f89dba9 100644
--- a/tests/test_apis.py
+++ b/tests/test_apis.py
@@ -380,6 +380,20 @@ class testETreeComments(unittest.TestCase):
                     '<!--foo-->\n')
 
 
+class testElementTailTests(unittest.TestCase):
+    """ Element Tail Tests """
+    def setUp(self):
+        self.pretty = markdown.treeprocessors.PrettifyTreeprocessor()
+
+    def testBrTailNoNewline(self):
+        """ Test that last <br> in tree has a new line tail """
+        root = markdown.util.etree.Element('root')
+        br = markdown.util.etree.SubElement(root, 'br')
+        self.assertEqual(br.tail, None)
+        self.pretty.run(root)
+        self.assertEqual(br.tail, "\n")
+
+
 class testSerializers(unittest.TestCase):
     """ Test the html and xhtml serializers. """