91 lines
2.5 KiB
Python
91 lines
2.5 KiB
Python
# Copyright 2004-2019 Tom Rothamel <pytom@bishoujo.us>
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# Allow pickling NoneType.
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from __future__ import print_function
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import __builtin__
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__builtin__.NoneType = type(None)
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class Object(object):
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"""
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Our own base class. Contains methods to simplify serialization.
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"""
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__version__ = 0
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nosave = [ ]
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def __getstate__(self):
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rv = vars(self).copy()
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for f in self.nosave:
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if f in rv:
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del rv[f]
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rv["__version__"] = self.__version__
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return rv
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# None, to prevent this from being called when unnecessary.
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after_setstate = None
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def __setstate__(self, new_dict):
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version = new_dict.pop("__version__", 0)
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self.__dict__.update(new_dict)
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if version != self.__version__:
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self.after_upgrade(version) # E1101
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if self.after_setstate:
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self.after_setstate() # E1102
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# We don't handle slots with this mechanism, since the call to vars should
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# throw an error.
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sentinels = { }
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class Sentinel(object):
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"""
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This is used to represent a sentinel object. There will be exactly one
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sentinel object with a name existing in the system at any time.
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"""
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def __new__(cls, name):
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rv = sentinels.get(name, None)
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if rv is None:
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rv = object.__new__(cls, name)
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sentinels[name] = rv
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return rv
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def __init__(self, name):
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self.name = name
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def __reduce__(self):
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return (Sentinel, (self.name, ))
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