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 # import standard packages

    18 

    19 # import Zope3 interfaces

    20 

    21 # import local interfaces

    22 

    23 # import Zope3 packages

    24 from zope.interface import Interface

    25 

    26 # import local packages

    27 

    28 

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

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

    31     if allow_context:

    32         parent = context

    33     else:

    34         parent = getattr(context, '__parent__', None)

    35     while parent is not None:

    36         if interface.providedBy(parent):

    37             return interface(parent)

    38         parent = getattr(parent, '__parent__', None)

    39     return None

    40 

    41 

    42 # copied from fanstatic (which copied it from zope.dottedname !)

    43 def resolve(name, module=None):

    44     name = name.split('.')

    45     if not name[0]:

    46         if module is None:

    47             raise ValueError("relative name without base module")

    48         module = module.split('.')

    49         name.pop(0)

    50         while not name[0]:

    51             module.pop()

    52             name.pop(0)

    53         name = module + name

    54 

    55     used = name.pop(0)

    56     found = __import__(used)

    57     for n in name:

    58         used += '.' + n

    59         try:

    60             found = getattr(found, n)

    61         except AttributeError:

    62             __import__(used)

    63             found = getattr(found, n)

    64 

    65     return found