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# License : https://github.com/slezica/python-frozendict/blob/master/LICENSE.txt
from __future__ import absolute_import, print_function, division
import collections
import operator
import functools
from theano.compat import Mapping
class frozendict(Mapping):
"""
An immutable wrapper around dictionaries that implements the complete :py:class:`collections.abc.Mapping`
interface. It can be used as a drop-in replacement for dictionaries where immutability and ordering are desired.
"""
dict_cls = dict
def __init__(self, *args, **kwargs):
self._dict = self.dict_cls(*args, **kwargs)
self._hash = None
def __getitem__(self, key):
return self._dict[key]
def __contains__(self, key):
return key in self._dict
def copy(self, **add_or_replace):
return self.__class__(self, **add_or_replace)
def __iter__(self):
return iter(self._dict)
def __len__(self):
return len(self._dict)
def __repr__(self):
return '<%s %r>' % (self.__class__.__name__, self._dict)
def __hash__(self):
if self._hash is None:
hashes = map(hash, self.items())
self._hash = functools.reduce(operator.xor, hashes, 0)
return self._hash
class FrozenOrderedDict(frozendict):
"""
A FrozenDict subclass that maintains key order
"""
dict_cls = collections.OrderedDict
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