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annotate mercurial/utils/interfaceutil.py @ 39883:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents 856f381ad74b
children
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856f381ad74b interfaceutil: module to stub out zope.interface
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1 # interfaceutil.py - Utilities for declaring interfaces.
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2 #
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 # zope.interface imposes a run-time cost due to module import overhead and
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9 # bookkeeping for declaring interfaces. So, we use stubs for various
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10 # zope.interface primitives unless instructed otherwise.
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11
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12 from __future__ import absolute_import
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13
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14 from .. import (
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15 encoding,
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16 )
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17
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18 if encoding.environ.get('HGREALINTERFACES'):
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19 from ..thirdparty.zope import (
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20 interface as zi,
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21 )
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22
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23 Attribute = zi.Attribute
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24 Interface = zi.Interface
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25 implementer = zi.implementer
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26 else:
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27 class Attribute(object):
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28 def __init__(self, __name__, __doc__=''):
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29 pass
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30
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31 class Interface(object):
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32 def __init__(self, name, bases=(), attrs=None, __doc__=None,
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33 __module__=None):
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34 pass
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35
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36 def implementer(*ifaces):
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37 def wrapper(cls):
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38 return cls
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39
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40 return wrapper