##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (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
#
##############################################################################
"""Path Iterator
A TALES Iterator with the ability to use first() and last() on
subpaths of elements.
"""
__version__='$Revision: 1.3 $'[11:-2]
import TALES
from Expressions import restrictedTraverse,Undefs,getSecurityManager
class Iterator(TALES.Iterator):
def __bobo_traverse__(self, REQUEST, name):
if name in ('first', 'last'):
path = REQUEST['TraversalRequestNameStack']
names = list(path)
names.reverse()
path[:] = [tuple(names)]
return getattr(self, name)
def same_part(self, name, ob1, ob2):
if name is None:
return ob1 == ob2
if isinstance(name, type('')):
name = name.split('/')
name = filter(None, name)
securityManager = getSecurityManager()
try:
ob1 = restrictedTraverse(ob1, name, securityManager)
ob2 = restrictedTraverse(ob2, name, securityManager)
except Undefs:
return 0
return ob1 == ob2
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