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##############################################################################
#
# Copyright (c) 2003 Zope Corporation and Contributors.
# 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 zope.interface
from zope.proxy import ProxyBase
from zope.proxy import getProxiedObject
from zope.proxy import non_overridable
from zope.proxy.decorator import DecoratorSpecificationDescriptor
from repoze.bfg.interfaces import ILocation
class Location(object):
"""Stupid mix-in that defines `__parent__` and `__name__` attributes."""
zope.interface.implements(ILocation)
__parent__ = __name__ = None
def locate(object, parent, name=None):
"""Locate an object in another
This method should only be called from trusted code, because it
sets attributes that are normally unsettable.
"""
object.__parent__ = parent
object.__name__ = name
def located(object, parent, name=None):
"""Locate an object in another and return it.
If the object does not provide ILocation a LocationProxy is returned.
"""
if ILocation.providedBy(object):
if parent is not object.__parent__ or name != object.__name__:
locate(object, parent, name)
return object
return LocationProxy(object, parent, name)
def LocationIterator(object):
while object is not None:
yield object
object = getattr(object, '__parent__', None)
def inside(l1, l2):
"""Is l1 inside l2
L1 is inside l2 if l2 is an ancestor of l1.
"""
while l1 is not None:
if l1 is l2:
return True
l1 = l1.__parent__
return False
class ClassAndInstanceDescr(object):
def __init__(self, *args):
self.funcs = args
def __get__(self, inst, cls):
if inst is None:
return self.funcs[1](cls)
return self.funcs[0](inst)
class LocationProxy(ProxyBase):
"""Location-object proxy
This is a non-picklable proxy that can be put around objects that
don't implement `ILocation`.
"""
zope.interface.implements(ILocation)
__slots__ = '__parent__', '__name__'
__safe_for_unpickling__ = True
def __new__(self, ob, container=None, name=None):
return ProxyBase.__new__(self, ob)
def __init__(self, ob, container=None, name=None):
ProxyBase.__init__(self, ob)
self.__parent__ = container
self.__name__ = name
@non_overridable
def __reduce__(self, proto=None):
raise TypeError("Not picklable")
__doc__ = ClassAndInstanceDescr(
lambda inst: getProxiedObject(inst).__doc__,
lambda cls, __doc__ = __doc__: __doc__,
)
__reduce_ex__ = __reduce__
__providedBy__ = DecoratorSpecificationDescriptor()
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