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# -*- coding: utf-8 -*- # # Copyright (c) 2010 Red Hat, Inc # # kitchen is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # kitchen is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with kitchen; if not, see <http://www.gnu.org/licenses/> # # Authors: # Toshio Kuratomi <toshio@fedoraproject.org> ''' ---------- StrictDict ---------- :class:`kitchen.collections.StrictDict` provides a dictionary that treats :class:`str` and :class:`unicode` as distinct key values. ''' # Pylint disabled messages: # :C0111: We're implementing the dict interface so just reference the dict # documentation rather than having our own docstrings try: # :E0611: Pylint false positive. We try to import from the stdlib but we # have a fallback so this is okay. #pylint:disable-msg=E0611 from collections import defaultdict except ImportError: from kitchen.pycompat25.collections import defaultdict class StrictDict(defaultdict): ''' Map class that considers :class:`unicode` and :class:`str` different keys Ordinarily when you are dealing with a :class:`dict` keyed on strings you want to have keys that have the same characters end up in the same bucket even if one key is :class:`unicode` and the other is a byte :class:`str`. The normal :class:`dict` type does this for :term:`ASCII` characters (but not for anything outside of the :term:`ASCII` range.) Sometimes, however, you want to keep the two string classes strictly separate, for instance, if you're creating a single table that can map from :class:`unicode` characters to :class:`str` characters and vice versa. This class will help you do that by making all :class:`unicode` keys evaluate to a different key than all :class:`str` keys. .. seealso:: :class:`dict` for documentation on this class's methods. This class implements all the standard :class:`dict` methods. Its treatment of :class:`unicode` and :class:`str` keys as separate is the only difference. ''' #pylint:disable-msg=C0111 def __getitem__(self, key): return defaultdict.__getitem__(self, (repr(key), key)) def __setitem__(self, key, value): defaultdict.__setitem__(self, (repr(key), key), value) def __delitem__(self, key): defaultdict.__delitem__(self, (repr(key), key)) def __iter__(self): for i in defaultdict.__iter__(self): yield i[1] iterkeys = __iter__ def keys(self): return list(self.__iter__()) def __contains__(self, key): return defaultdict.__contains__(self, (repr(key), key)) __all__ = ('StrictDict',)