diff -r 044dc196ec8a -r d3668ecd9137 src/ztfy/utils/traversing.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ztfy/utils/traversing.py	Wed Jun 20 16:29:53 2012 +0200
@@ -0,0 +1,65 @@
+### -*- coding: utf-8 -*- ####################################################
+##############################################################################
+#
+# Copyright (c) 2008 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+
+# import standard packages
+
+# import Zope3 interfaces
+
+# import local interfaces
+
+# import Zope3 packages
+from zope.interface import Interface
+
+# import local packages
+
+
+def getParent(context, interface=Interface, allow_context=True):
+    """Get first parent of the given context that implements given interface"""
+    if allow_context:
+        parent = context
+    else:
+        parent = getattr(context, '__parent__', None)
+    while parent is not None:
+        if interface.providedBy(parent):
+            return interface(parent)
+        parent = getattr(parent, '__parent__', None)
+    return None
+
+
+# copied from fanstatic (which copied it from zope.dottedname !)
+def resolve(name, module=None):
+    name = name.split('.')
+    if not name[0]:
+        if module is None:
+            raise ValueError("relative name without base module")
+        module = module.split('.')
+        name.pop(0)
+        while not name[0]:
+            module.pop()
+            name.pop(0)
+        name = module + name
+
+    used = name.pop(0)
+    found = __import__(used)
+    for n in name:
+        used += '.' + n
+        try:
+            found = getattr(found, n)
+        except AttributeError:
+            __import__(used)
+            found = getattr(found, n)
+
+    return found