1 ### -*- coding: utf-8 -*- ####################################################

     2 ##############################################################################

     3 #

     4 # Copyright (c) 2008 Thierry Florac <tflorac AT ulthar.net>

     5 # All Rights Reserved.

     6 #

     7 # This software is subject to the provisions of the Zope Public License,

     8 # Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.

     9 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

    10 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    11 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

    12 # FOR A PARTICULAR PURPOSE.

    13 #

    14 ##############################################################################

    15 """

    16 

    17 $Id: $

    18 """

    19 

    20 __version__   = "$Revision: $"

    21 __release__   = "$Id: $"

    22 __docformat__ = "restructuredtext"

    23  

    24 # import standard packages

    25 

    26 # import Zope3 interfaces

    27 

    28 # import local interfaces

    29 

    30 # import Zope3 packages

    31 from zope.interface import Interface

    32 from zope.app import zapi

    33 

    34 # import local packages

    35 

    36 

    37 def getParent(context, interface=Interface, allow_context=True):

    38     """Get first parent of the given context that implements given interface"""

    39     if allow_context:

    40         parent = context

    41     else:

    42         parent = zapi.getParent(context)

    43     while parent is not None:

    44         if interface.providedBy(parent):

    45             return interface(parent)

    46         parent = zapi.getParent(parent)

    47     return None