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# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
class SlotObject:
__slots__ = ("__weakref__",)
def __init__(self, **kwargs):
classes = [self.__class__]
while classes:
c = classes.pop()
if c is SlotObject:
continue
classes.extend(c.__bases__)
slots = getattr(c, "__slots__", None)
if not slots:
continue
for myattr in slots:
myvalue = kwargs.pop(myattr, None)
if myvalue is None and getattr(self, myattr, None) is not None:
raise AssertionError(
"class '%s' duplicates '%s' value in __slots__ of base class '%s'"
% (self.__class__.__name__, myattr, c.__name__)
)
try:
setattr(self, myattr, myvalue)
except AttributeError:
# Allow a property to override a __slots__ value, but raise an
# error if the intended value is something other than None.
if not (
myvalue is None
and isinstance(getattr(type(self), myattr, None), property)
):
raise
if kwargs:
raise TypeError(
"'%s' is an invalid keyword argument for this constructor"
% (next(iter(kwargs)),)
)
def copy(self):
"""
Create a new instance and copy all attributes
defined from __slots__ (including those from
inherited classes).
"""
obj = self.__class__()
classes = [self.__class__]
while classes:
c = classes.pop()
if c is SlotObject:
continue
classes.extend(c.__bases__)
slots = getattr(c, "__slots__", None)
if not slots:
continue
for myattr in slots:
setattr(obj, myattr, getattr(self, myattr))
return obj
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