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| # Copyright (c) 2017-present, Facebook, Inc. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| ############################################################################## | |
| """A simple attribute dictionary used for representing configuration options.""" | |
| from __future__ import absolute_import | |
| from __future__ import division | |
| from __future__ import print_function | |
| from __future__ import unicode_literals | |
| class AttrDict(dict): | |
| IMMUTABLE = '__immutable__' | |
| def __init__(self, *args, **kwargs): | |
| super().__init__(*args, **kwargs) | |
| self.__dict__[AttrDict.IMMUTABLE] = False | |
| def __getattr__(self, name): | |
| if name in self.__dict__: | |
| return self.__dict__[name] | |
| elif name in self: | |
| return self[name] | |
| else: | |
| raise AttributeError(name) | |
| def __setattr__(self, name, value): | |
| if not self.__dict__[AttrDict.IMMUTABLE]: | |
| if name in self.__dict__: | |
| self.__dict__[name] = value | |
| else: | |
| self[name] = value | |
| else: | |
| raise AttributeError( | |
| 'Attempted to set "{}" to "{}", but AttrDict is immutable'.format(name, value) | |
| ) | |
| def immutable(self, is_immutable): | |
| """Set immutability to is_immutable and recursively apply the setting | |
| to all nested AttrDicts. | |
| """ | |
| self.__dict__[AttrDict.IMMUTABLE] = is_immutable | |
| # Recursively set immutable state | |
| for v in self.__dict__.values(): | |
| if isinstance(v, AttrDict): | |
| v.immutable(is_immutable) | |
| for v in self.values(): | |
| if isinstance(v, AttrDict): | |
| v.immutable(is_immutable) | |
| def is_immutable(self): | |
| return self.__dict__[AttrDict.IMMUTABLE] | |