Pre-parse StanzaPath paths to speed up matching.

The parsing and namespace cleaning isn't terribly expensive, but it does
add up. It was adding an extra 5sec when processing 100,000 basic
message stanzas.

sleekxmpp/xmlstream/matcher/stanzapath.py

@@ -10,6 +10,7 @@
 """
 
 from sleekxmpp.xmlstream.matcher.base import MatcherBase
+from sleekxmpp.xmlstream.stanzabase import fix_ns
 
 
 class StanzaPath(MatcherBase):
@@ -18,8 +19,16 @@ class StanzaPath(MatcherBase):
     The StanzaPath matcher selects stanzas that match a given "stanza path",
     which is similar to a normal XPath except that it uses the interfaces and
     plugins of the stanza instead of the actual, underlying XML.
+
+    :param criteria: Object to compare some aspect of a stanza against.
     """
 
+    def __init__(self, criteria):
+        self._criteria = fix_ns(criteria, split=True,
+                                          propagate_ns=False,
+                                          default_ns='jabber:client')
+        self._raw_criteria = criteria
+
     def match(self, stanza):
         """
         Compare a stanza against a "stanza path". A stanza path is similar to
@@ -31,4 +40,4 @@ class StanzaPath(MatcherBase):
         :param stanza: The :class:`~sleekxmpp.xmlstream.stanzabase.ElementBase`
                        stanza to compare against.
         """
-        return stanza.match(self._criteria)
+        return stanza.match(self._criteria) or stanza.match(self._raw_criteria)

sleekxmpp/xmlstream/stanzabase.py

@@ -77,6 +77,49 @@ def register_stanza_plugin(stanza, plugin, iterable=False, overrides=False):
 registerStanzaPlugin = register_stanza_plugin
 
 
+def fix_ns(xpath, split=False, propagate_ns=True, default_ns=''):
+    """Apply the stanza's namespace to elements in an XPath expression.
+
+    :param string xpath: The XPath expression to fix with namespaces.
+    :param bool split: Indicates if the fixed XPath should be left as a
+                       list of element names with namespaces. Defaults to
+                       False, which returns a flat string path.
+    :param bool propagate_ns: Overrides propagating parent element
+                              namespaces to child elements. Useful if
+                              you wish to simply split an XPath that has
+                              non-specified namespaces, and child and
+                              parent namespaces are known not to always
+                              match. Defaults to True.
+    """
+    fixed = []
+    # Split the XPath into a series of blocks, where a block
+    # is started by an element with a namespace.
+    ns_blocks = xpath.split('{')
+    for ns_block in ns_blocks:
+        if '}' in ns_block:
+            # Apply the found namespace to following elements
+            # that do not have namespaces.
+            namespace = ns_block.split('}')[0]
+            elements = ns_block.split('}')[1].split('/')
+        else:
+            # Apply the stanza's namespace to the following
+            # elements since no namespace was provided.
+            namespace = default_ns
+            elements = ns_block.split('/')
+
+        for element in elements:
+            if element:
+                # Skip empty entry artifacts from splitting.
+                if propagate_ns:
+                    tag = '{%s}%s' % (namespace, element)
+                else:
+                    tag = element
+                fixed.append(tag)
+    if split:
+        return fixed
+    return '/'.join(fixed)
+
+
 class ElementBase(object):
 
     """
@@ -760,7 +803,7 @@ class ElementBase(object):
                              may be either a string or a list of element
                              names with attribute checks.
         """
-        if isinstance(xpath, str):
+        if not isinstance(xpath, list):
             xpath = self._fix_ns(xpath, split=True, propagate_ns=False)
 
         # Extract the tag name and attribute checks for the first XPath node.
@@ -952,46 +995,9 @@ class ElementBase(object):
         return self
 
     def _fix_ns(self, xpath, split=False, propagate_ns=True):
-        """Apply the stanza's namespace to elements in an XPath expression.
+        return fix_ns(xpath, split=split, 
-
+                             propagate_ns=propagate_ns, 
-        :param string xpath: The XPath expression to fix with namespaces.
+                             default_ns=self.namespace)
-        :param bool split: Indicates if the fixed XPath should be left as a
-                           list of element names with namespaces. Defaults to
-                           False, which returns a flat string path.
-        :param bool propagate_ns: Overrides propagating parent element
-                                  namespaces to child elements. Useful if
-                                  you wish to simply split an XPath that has
-                                  non-specified namespaces, and child and
-                                  parent namespaces are known not to always
-                                  match. Defaults to True.
-        """
-        fixed = []
-        # Split the XPath into a series of blocks, where a block
-        # is started by an element with a namespace.
-        ns_blocks = xpath.split('{')
-        for ns_block in ns_blocks:
-            if '}' in ns_block:
-                # Apply the found namespace to following elements
-                # that do not have namespaces.
-                namespace = ns_block.split('}')[0]
-                elements = ns_block.split('}')[1].split('/')
-            else:
-                # Apply the stanza's namespace to the following
-                # elements since no namespace was provided.
-                namespace = self.namespace
-                elements = ns_block.split('/')
-
-            for element in elements:
-                if element:
-                    # Skip empty entry artifacts from splitting.
-                    if propagate_ns:
-                        tag = '{%s}%s' % (namespace, element)
-                    else:
-                        tag = element
-                    fixed.append(tag)
-        if split:
-            return fixed
-        return '/'.join(fixed)
 
     def __eq__(self, other):
         """Compare the stanza object with another to test for equality.