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annotate mercurial/policy.py @ 32210:56148133ef36

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policy: mark all string literals as sysstr or bytes The policy module won't be imported early in future, which means string literals will be processed by our Python 3 loader.
author Yuya Nishihara <yuya@tcha.org>
date Tue, 02 May 2017 18:35:09 +0900
parents 8a17c541177f
children a04f5c651e52
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1 # policy.py - module policy logic for Mercurial.
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2 #
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3 # Copyright 2015 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 from __future__ import absolute_import
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9
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10 import os
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11 import sys
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12
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13 # Rules for how modules can be loaded. Values are:
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14 #
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15 # c - require C extensions
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16 # allow - allow pure Python implementation when C loading fails
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17 # cffi - required cffi versions (implemented within pure module)
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18 # cffi-allow - allow pure Python implementation if cffi version is missing
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19 # py - only load pure Python modules
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20 #
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21 # By default, require the C extensions for performance reasons.
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
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22 policy = b'c'
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23 policynoc = (b'cffi', b'cffi-allow', b'py')
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24 policynocffi = (b'c', b'py')
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25
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26 try:
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27 from . import __modulepolicy__
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28 policy = __modulepolicy__.modulepolicy
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29 except ImportError:
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30 pass
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31
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32 # PyPy doesn't load C extensions.
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33 #
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34 # The canonical way to do this is to test platform.python_implementation().
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35 # But we don't import platform and don't bloat for it here.
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36 if r'__pypy__' in sys.builtin_module_names:
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37 policy = b'cffi'
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38
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39 # Our C extensions aren't yet compatible with Python 3. So use pure Python
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40 # on Python 3 for now.
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41 if sys.version_info[0] >= 3:
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42 policy = b'py'
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43
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44 # Environment variable can always force settings.
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45 if sys.version_info[0] >= 3:
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46 if r'HGMODULEPOLICY' in os.environ:
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47 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8')
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48 else:
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49 policy = os.environ.get(r'HGMODULEPOLICY', policy)