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annotate mercurial/__init__.py @ 32372:df448de7cf3b

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parsers: switch to policy importer # no-check-commit
author Yuya Nishihara <yuya@tcha.org>
date Sat, 13 Aug 2016 12:23:56 +0900
parents 151cc3b3d799
children 5700825889fb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # __init__.py - Startup and module loading 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 imp
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11 import os
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12 import sys
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13 import zipimport
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14
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15 from . import (
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16 policy
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17 )
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18
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19 __all__ = []
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20
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21 modulepolicy = policy.policy
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22
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23 # Modules that have both Python and C implementations. See also the
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24 # set of .py files under mercurial/pure/.
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25 _dualmodules = {
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26 }
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27
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28 class hgimporter(object):
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29 """Object that conforms to import hook interface defined in PEP-302."""
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30 def find_module(self, name, path=None):
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31 # We only care about modules that have both C and pure implementations.
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32 if name in _dualmodules:
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33 return self
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34 return None
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35
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36 def load_module(self, name):
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37 mod = sys.modules.get(name, None)
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38 if mod:
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39 return mod
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40
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41 mercurial = sys.modules['mercurial']
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42
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43 # The zip importer behaves sufficiently differently from the default
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44 # importer to warrant its own code path.
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45 loader = getattr(mercurial, '__loader__', None)
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46 if isinstance(loader, zipimport.zipimporter):
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47 def ziploader(*paths):
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48 """Obtain a zipimporter for a directory under the main zip."""
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49 path = os.path.join(loader.archive, *paths)
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50 zl = sys.path_importer_cache.get(path)
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51 if not zl:
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52 zl = zipimport.zipimporter(path)
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53 return zl
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54
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55 try:
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56 if modulepolicy in policy.policynoc:
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57 raise ImportError()
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58
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59 zl = ziploader('mercurial')
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60 mod = zl.load_module(name)
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61 # Unlike imp, ziploader doesn't expose module metadata that
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62 # indicates the type of module. So just assume what we found
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63 # is OK (even though it could be a pure Python module).
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64 except ImportError:
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65 if modulepolicy == b'c':
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66 raise
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67 zl = ziploader('mercurial', 'pure')
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68 mod = zl.load_module(name)
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69
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70 sys.modules[name] = mod
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71 return mod
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72
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73 # Unlike the default importer which searches special locations and
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74 # sys.path, we only look in the directory where "mercurial" was
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75 # imported from.
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76
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77 # imp.find_module doesn't support submodules (modules with ".").
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78 # Instead you have to pass the parent package's __path__ attribute
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79 # as the path argument.
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80 stem = name.split('.')[-1]
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81
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82 try:
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83 if modulepolicy in policy.policynoc:
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84 raise ImportError()
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85
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86 modinfo = imp.find_module(stem, mercurial.__path__)
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87
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88 # The Mercurial installer used to copy files from
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89 # mercurial/pure/*.py to mercurial/*.py. Therefore, it's possible
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90 # for some installations to have .py files under mercurial/*.
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91 # Loading Python modules when we expected C versions could result
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92 # in a) poor performance b) loading a version from a previous
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93 # Mercurial version, potentially leading to incompatibility. Either
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94 # scenario is bad. So we verify that modules loaded from
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95 # mercurial/* are C extensions. If the current policy allows the
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96 # loading of .py modules, the module will be re-imported from
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97 # mercurial/pure/* below.
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98 if modinfo[2][2] != imp.C_EXTENSION:
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99 raise ImportError('.py version of %s found where C '
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100 'version should exist' % name)
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101
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102 except ImportError:
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103 if modulepolicy == b'c':
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104 raise
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105
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106 # Could not load the C extension and pure Python is allowed. So
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107 # try to load them.
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108 from . import pure
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109 modinfo = imp.find_module(stem, pure.__path__)
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110 if not modinfo:
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111 raise ImportError('could not find mercurial module %s' %
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112 name)
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113
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114 mod = imp.load_module(name, *modinfo)
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115 sys.modules[name] = mod
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116 return mod
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117
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118 # Python 3 uses a custom module loader that transforms source code between
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119 # source file reading and compilation. This is done by registering a custom
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120 # finder that changes the spec for Mercurial modules to use a custom loader.
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121 if sys.version_info[0] >= 3:
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122 from . import pure
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123 import importlib
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124 import io
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125 import token
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126 import tokenize
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127
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128 class hgpathentryfinder(importlib.abc.MetaPathFinder):
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129 """A sys.meta_path finder that uses a custom module loader."""
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130 def find_spec(self, fullname, path, target=None):
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131 # Only handle Mercurial-related modules.
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132 if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')):
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133 return None
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134 # zstd is already dual-version clean, don't try and mangle it
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135 if fullname.startswith('mercurial.zstd'):
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136 return None
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137
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138 # This assumes Python 3 doesn't support loading C modules.
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139 if fullname in _dualmodules:
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140 stem = fullname.split('.')[-1]
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141 fullname = 'mercurial.pure.%s' % stem
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142 target = pure
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143 assert len(path) == 1
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144 path = [os.path.join(path[0], 'pure')]
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145
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146 # Try to find the module using other registered finders.
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147 spec = None
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148 for finder in sys.meta_path:
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149 if finder == self:
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150 continue
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151
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152 spec = finder.find_spec(fullname, path, target=target)
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153 if spec:
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154 break
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155
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156 # This is a Mercurial-related module but we couldn't find it
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157 # using the previously-registered finders. This likely means
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158 # the module doesn't exist.
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159 if not spec:
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160 return None
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161
32212
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162 if (fullname.startswith('mercurial.pure.')
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163 and fullname.replace('.pure.', '.') in _dualmodules):
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164 spec.name = spec.name.replace('.pure.', '.')
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165
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166 # TODO need to support loaders from alternate specs, like zip
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167 # loaders.
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168 spec.loader = hgloader(spec.name, spec.origin)
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169 return spec
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170
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171 def replacetokens(tokens, fullname):
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172 """Transform a stream of tokens from raw to Python 3.
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173
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174 It is called by the custom module loading machinery to rewrite
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175 source/tokens between source decoding and compilation.
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176
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177 Returns a generator of possibly rewritten tokens.
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178
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179 The input token list may be mutated as part of processing. However,
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180 its changes do not necessarily match the output token stream.
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181
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182 REMEMBER TO CHANGE ``BYTECODEHEADER`` WHEN CHANGING THIS FUNCTION
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183 OR CACHED FILES WON'T GET INVALIDATED PROPERLY.
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184 """
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185 futureimpline = False
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186
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187 # The following utility functions access the tokens list and i index of
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188 # the for i, t enumerate(tokens) loop below
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189 def _isop(j, *o):
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190 """Assert that tokens[j] is an OP with one of the given values"""
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191 try:
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192 return tokens[j].type == token.OP and tokens[j].string in o
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193 except IndexError:
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194 return False
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195
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196 def _findargnofcall(n):
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197 """Find arg n of a call expression (start at 0)
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198
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199 Returns index of the first token of that argument, or None if
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200 there is not that many arguments.
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201
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202 Assumes that token[i + 1] is '('.
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203
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204 """
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205 nested = 0
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206 for j in range(i + 2, len(tokens)):
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207 if _isop(j, ')', ']', '}'):
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208 # end of call, tuple, subscription or dict / set
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209 nested -= 1
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210 if nested < 0:
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211 return None
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212 elif n == 0:
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213 # this is the starting position of arg
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214 return j
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215 elif _isop(j, '(', '[', '{'):
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216 nested += 1
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217 elif _isop(j, ',') and nested == 0:
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218 n -= 1
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219
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220 return None
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221
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222 def _ensureunicode(j):
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223 """Make sure the token at j is a unicode string
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224
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diff changeset
225 This rewrites a string token to include the unicode literal prefix
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diff changeset
226 so the string transformer won't add the byte prefix.
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227
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228 Ignores tokens that are not strings. Assumes bounds checking has
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diff changeset
229 already been done.
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diff changeset
230
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231 """
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232 st = tokens[j]
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233 if st.type == token.STRING and st.string.startswith(("'", '"')):
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234 tokens[j] = st._replace(string='u%s' % st.string)
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diff changeset
235
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236 for i, t in enumerate(tokens):
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237 # Convert most string literals to byte literals. String literals
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238 # in Python 2 are bytes. String literals in Python 3 are unicode.
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239 # Most strings in Mercurial are bytes and unicode strings are rare.
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240 # Rather than rewrite all string literals to use ``b''`` to indicate
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diff changeset
241 # byte strings, we apply this token transformer to insert the ``b``
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diff changeset
242 # prefix nearly everywhere.
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diff changeset
243 if t.type == token.STRING:
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diff changeset
244 s = t.string
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diff changeset
245
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
246 # Preserve docstrings as string literals. This is inconsistent
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diff changeset
247 # with regular unprefixed strings. However, the
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diff changeset
248 # "from __future__" parsing (which allows a module docstring to
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249 # exist before it) doesn't properly handle the docstring if it
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diff changeset
250 # is b''' prefixed, leading to a SyntaxError. We leave all
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diff changeset
251 # docstrings as unprefixed to avoid this. This means Mercurial
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diff changeset
252 # components touching docstrings need to handle unicode,
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diff changeset
253 # unfortunately.
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diff changeset
254 if s[0:3] in ("'''", '"""'):
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diff changeset
255 yield t
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
256 continue
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diff changeset
257
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258 # If the first character isn't a quote, it is likely a string
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diff changeset
259 # prefixing character (such as 'b', 'u', or 'r'. Ignore.
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diff changeset
260 if s[0] not in ("'", '"'):
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diff changeset
261 yield t
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
262 continue
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
263
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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264 # String literal. Prefix to make a b'' string.
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265 yield t._replace(string='b%s' % t.string)
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diff changeset
266 continue
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
267
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268 # Insert compatibility imports at "from __future__ import" line.
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diff changeset
269 # No '\n' should be added to preserve line numbers.
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270 if (t.type == token.NAME and t.string == 'import' and
178c89e8519a py3: import builtin wrappers automagically by code transformer
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271 all(u.type == token.NAME for u in tokens[i - 2:i]) and
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272 [u.string for u in tokens[i - 2:i]] == ['from', '__future__']):
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273 futureimpline = True
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diff changeset
274 if t.type == token.NEWLINE and futureimpline:
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275 futureimpline = False
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276 if fullname == 'mercurial.pycompat':
178c89e8519a py3: import builtin wrappers automagically by code transformer
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diff changeset
277 yield t
178c89e8519a py3: import builtin wrappers automagically by code transformer
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diff changeset
278 continue
178c89e8519a py3: import builtin wrappers automagically by code transformer
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279 r, c = t.start
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diff changeset
280 l = (b'; from mercurial.pycompat import '
31843
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281 b'delattr, getattr, hasattr, setattr, xrange, '
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282 b'open, unicode\n')
29800
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283 for u in tokenize.tokenize(io.BytesIO(l).readline):
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284 if u.type in (tokenize.ENCODING, token.ENDMARKER):
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diff changeset
285 continue
30166
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Martijn Pieters <mjpieters@fb.com>
parents: 30165
diff changeset
286 yield u._replace(
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Martijn Pieters <mjpieters@fb.com>
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287 start=(r, c + u.start[1]), end=(r, c + u.end[1]))
29800
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288 continue
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diff changeset
289
29550
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diff changeset
290 # This looks like a function call.
30165
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291 if t.type == token.NAME and _isop(i + 1, '('):
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292 fn = t.string
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293
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294 # *attr() builtins don't accept byte strings to 2nd argument.
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295 if (fn in ('getattr', 'setattr', 'hasattr', 'safehasattr') and
423377290a3a py3: refactor token parsing to handle call args properly
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296 not _isop(i - 1, '.')):
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diff changeset
297 arg1idx = _findargnofcall(1)
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298 if arg1idx is not None:
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299 _ensureunicode(arg1idx)
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300
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301 # .encode() and .decode() on str/bytes/unicode don't accept
30165
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diff changeset
302 # byte strings on Python 3.
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Martijn Pieters <mjpieters@fb.com>
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diff changeset
303 elif fn in ('encode', 'decode') and _isop(i - 1, '.'):
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diff changeset
304 for argn in range(2):
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305 argidx = _findargnofcall(argn)
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diff changeset
306 if argidx is not None:
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diff changeset
307 _ensureunicode(argidx)
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diff changeset
308
31445
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diff changeset
309 # It changes iteritems/values to items/values as they are not
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310 # present in Python 3 world.
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diff changeset
311 elif fn in ('iteritems', 'itervalues'):
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diff changeset
312 yield t._replace(string=fn[4:])
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diff changeset
313 continue
eaaedad68011 py3: switch to .items() using transformer
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parents: 30051
diff changeset
314
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diff changeset
315 # Emit unmodified token.
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diff changeset
316 yield t
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diff changeset
317
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
318 # Header to add to bytecode files. This MUST be changed when
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
319 # ``replacetoken`` or any mechanism that changes semantics of module
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
320 # loading is changed. Otherwise cached bytecode may get loaded without
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
321 # the new transformation mechanisms applied.
31843
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diff changeset
322 BYTECODEHEADER = b'HG\x00\x0a'
29550
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diff changeset
323
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
324 class hgloader(importlib.machinery.SourceFileLoader):
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325 """Custom module loader that transforms source code.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
326
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
327 When the source code is converted to a code object, we transform
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diff changeset
328 certain patterns to be Python 3 compatible. This allows us to write code
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
329 that is natively Python 2 and compatible with Python 3 without
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
330 making the code excessively ugly.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
331
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
332 We do this by transforming the token stream between parse and compile.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
333
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
334 Implementing transformations invalidates caching assumptions made
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
335 by the built-in importer. The built-in importer stores a header on
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
336 saved bytecode files indicating the Python/bytecode version. If the
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
337 version changes, the cached bytecode is ignored. The Mercurial
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
338 transformations could change at any time. This means we need to check
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
339 that cached bytecode was generated with the current transformation
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
340 code or there could be a mismatch between cached bytecode and what
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
341 would be generated from this class.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
342
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
343 We supplement the bytecode caching layer by wrapping ``get_data``
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
344 and ``set_data``. These functions are called when the
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
345 ``SourceFileLoader`` retrieves and saves bytecode cache files,
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
346 respectively. We simply add an additional header on the file. As
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
347 long as the version in this file is changed when semantics change,
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
348 cached bytecode should be invalidated when transformations change.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
349
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
350 The added header has the form ``HG<VERSION>``. That is a literal
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
351 ``HG`` with 2 binary bytes indicating the transformation version.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
352 """
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
353 def get_data(self, path):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
354 data = super(hgloader, self).get_data(path)
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
355
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
356 if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
357 return data
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
358
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
359 # There should be a header indicating the Mercurial transformation
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
360 # version. If it doesn't exist or doesn't match the current version,
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
361 # we raise an OSError because that is what
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
362 # ``SourceFileLoader.get_code()`` expects when loading bytecode
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
363 # paths to indicate the cached file is "bad."
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
364 if data[0:2] != b'HG':
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
365 raise OSError('no hg header')
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
366 if data[0:4] != BYTECODEHEADER:
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
367 raise OSError('hg header version mismatch')
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
368
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
369 return data[4:]
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
370
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
371 def set_data(self, path, data, *args, **kwargs):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
372 if path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
373 data = BYTECODEHEADER + data
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
374
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
375 return super(hgloader, self).set_data(path, data, *args, **kwargs)
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
376
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
377 def source_to_code(self, data, path):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
378 """Perform token transformation before compilation."""
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
379 buf = io.BytesIO(data)
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
380 tokens = tokenize.tokenize(buf.readline)
29800
178c89e8519a py3: import builtin wrappers automagically by code transformer
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diff changeset
381 data = tokenize.untokenize(replacetokens(list(tokens), self.name))
29550
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diff changeset
382 # Python's built-in importer strips frames from exceptions raised
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
383 # for this code. Unfortunately, that mechanism isn't extensible
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
384 # and our frame will be blamed for the import failure. There
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
385 # are extremely hacky ways to do frame stripping. We haven't
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
386 # implemented them because they are very ugly.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
387 return super(hgloader, self).source_to_code(data, path)
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
388
27220
4374d819ccd5 mercurial: implement import hook for handling C/Python modules
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parents: 0
diff changeset
389 # We automagically register our custom importer as a side-effect of loading.
4374d819ccd5 mercurial: implement import hook for handling C/Python modules
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parents: 0
diff changeset
390 # This is necessary to ensure that any entry points are able to import
4374d819ccd5 mercurial: implement import hook for handling C/Python modules
Gregory Szorc <gregory.szorc@gmail.com>
parents: 0
diff changeset
391 # mercurial.* modules without having to perform this registration themselves.
29550
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
392 if sys.version_info[0] >= 3:
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
393 _importercls = hgpathentryfinder
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
394 else:
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
395 _importercls = hgimporter
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
396 if not any(isinstance(x, _importercls) for x in sys.meta_path):
27220
4374d819ccd5 mercurial: implement import hook for handling C/Python modules
Gregory Szorc <gregory.szorc@gmail.com>
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397 # meta_path is used before any implicit finders and before sys.path.
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1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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398 sys.meta_path.insert(0, _importercls())