# HG changeset patch
# User paulb
# Date 1173814386 0
# Node ID ad3e17df1e84f6d13c5f14d954d4826e46bbc216
# Parent  c8441afb91a47f73b53561869b2f4fb822435906
[project @ 2007-03-13 19:33:06 by paulb]
Fixed previousSibling, nextSibling, parentNode using a test for the result
of the underlying function providing the libxml2 result for such
operations.
Reintroduced node comparisons.
Added a getDOMImplementation function.

diff -r c8441afb91a4 -r ad3e17df1e84 libxml2dom/__init__.py
--- a/libxml2dom/__init__.py	Tue Mar 13 19:31:48 2007 +0000
+++ b/libxml2dom/__init__.py	Tue Mar 13 19:33:06 2007 +0000
@@ -56,6 +56,12 @@
         else:
             return Node(_node, self, context_node.ownerDocument)
 
+    def get_node_or_none(self, _node, context_node):
+        if _node is None:
+            return None
+        else:
+            return self.get_node(_node, context_node)
+
 # Attribute and node list wrappers.
 
 class NamedNodeMap(object):
@@ -219,13 +225,13 @@
         return Node_localName(self._node)
 
     def _parentNode(self):
-        return self.impl.get_node(Node_parentNode(self._node), self)
+        return self.impl.get_node_or_none(Node_parentNode(self._node), self)
 
     def _previousSibling(self):
-        return self.impl.get_node(Node_previousSibling(self._node), self)
+        return self.impl.get_node_or_none(Node_previousSibling(self._node), self)
 
     def _nextSibling(self):
-        return self.impl.get_node(Node_nextSibling(self._node), self)
+        return self.impl.get_node_or_none(Node_nextSibling(self._node), self)
 
     def _doctype(self):
         return self.impl.get_node(Node_doctype(self._node), self)
@@ -400,11 +406,14 @@
     entities = {}
     notations = {}
 
-    #def isSameNode(self, other):
-    #    return self._node.nodePath() == other._node.nodePath()
+    def isSameNode(self, other):
+        return self == other
 
-    #def __eq__(self, other):
-    #    return self._node.nodePath() == other._node.nodePath()
+    def __eq__(self, other):
+        return isinstance(other, Node) and libxml2mod.xmlXPathCmpNodes(self._node, other._node) == 0
+
+    def __ne__(self, other):
+        return not (self == other)
 
     # 4DOM extensions to the usual PyXML API.
     # NOTE: To be finished.
@@ -457,15 +466,11 @@
     def _ownerDocument(self):
         return self
 
-    def _parentNode(self):
-        return None
-
     def __del__(self):
         #print "Freeing document", self._node
         libxml2mod.xmlFreeDoc(self._node)
 
     ownerDocument = property(_ownerDocument)
-    parentNode = property(_parentNode)
 
 class DocumentType(object):
 
@@ -628,6 +633,12 @@
         results.append(Node(node, impl, doc))
     return results
 
+def getDOMImplementation():
+
+    "Return the default DOM implementation."
+
+    return default_impl
+
 # Single instance of the implementation.
 
 default_impl = Implementation()