69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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# pylint: disable=unused-import,bad-mcs-method-argument
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"""Wrapper for Python 3.5's typing module.
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This wrapper is needed as both Python 3.5 and typing for PyPI isn't commonly
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packaged yet. As we don't actually need anything from the typing module at
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runtime, we instead mock the typing classes (using objects to make things
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easier) so the typing module isn't a hard dependency.
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"""
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# Those are defined here to make them testable easily
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class FakeTypingMeta(type):
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"""Fake typing metaclass like typing.TypingMeta."""
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def __init__(self, *args, # pylint: disable=super-init-not-called
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**_kwds):
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pass
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class FakeUnionMeta(FakeTypingMeta):
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"""Fake union metaclass metaclass like typing.UnionMeta."""
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def __new__(cls, name, bases, namespace, parameters=None):
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if parameters is None:
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return super().__new__(cls, name, bases, namespace)
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self = super().__new__(cls, name, bases, {})
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self.__union_params__ = tuple(parameters)
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return self
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def __getitem__(self, parameters):
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return self.__class__(self.__name__, self.__bases__,
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dict(self.__dict__), parameters=parameters)
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class FakeUnion(metaclass=FakeUnionMeta):
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"""Fake Union type like typing.Union."""
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__union_params__ = None
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try:
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from typing import Union
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except ImportError: # pragma: no cover
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Union = FakeUnion
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