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annotate mercurial/pycompat.py @ 30032:2219f4f82ede

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pycompat: extract function that converts attribute or encoding name to str This will be used to convert encoding.encoding to a str acceptable by Python 3 functions. The source encoding is changed to "latin-1" because encoding.encoding can have arbitrary bytes. Since valid names should consist of ASCII characters, we don't care about the mapping of non-ASCII characters so long as invalid names are distinct from valid names.
author Yuya Nishihara <yuya@tcha.org>
date Wed, 28 Sep 2016 22:32:09 +0900
parents 0f6d6fdd3c2a
children f3a1089654e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # pycompat.py - portability shim for python 3
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5
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6 """Mercurial portability shim for python 3.
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7
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8 This contains aliases to hide python version-specific details from the core.
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9 """
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10
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11 from __future__ import absolute_import
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12
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13 import sys
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14
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15 ispy3 = (sys.version_info[0] >= 3)
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16
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17 if not ispy3:
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18 import cPickle as pickle
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19 import cStringIO as io
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20 import httplib
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21 import Queue as _queue
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22 import SocketServer as socketserver
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23 import urlparse
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24 import xmlrpclib
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25 else:
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26 import http.client as httplib
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27 import io
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28 import pickle
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29 import queue as _queue
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30 import socketserver
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31 import urllib.parse as urlparse
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32 import xmlrpc.client as xmlrpclib
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33
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34 if ispy3:
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35 import builtins
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36 import functools
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37
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38 def sysstr(s):
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39 """Return a keyword str to be passed to Python functions such as
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40 getattr() and str.encode()
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41
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42 This never raises UnicodeDecodeError. Non-ascii characters are
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43 considered invalid and mapped to arbitrary but unique code points
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44 such that 'sysstr(a) != sysstr(b)' for all 'a != b'.
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45 """
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46 if isinstance(s, builtins.str):
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47 return s
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48 return s.decode(u'latin-1')
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49
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50 def _wrapattrfunc(f):
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51 @functools.wraps(f)
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52 def w(object, name, *args):
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53 return f(object, sysstr(name), *args)
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54 return w
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55
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56 # these wrappers are automagically imported by hgloader
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57 delattr = _wrapattrfunc(builtins.delattr)
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58 getattr = _wrapattrfunc(builtins.getattr)
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59 hasattr = _wrapattrfunc(builtins.hasattr)
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60 setattr = _wrapattrfunc(builtins.setattr)
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61 xrange = builtins.range
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62
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63 else:
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64 def sysstr(s):
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65 return s
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66
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67 stringio = io.StringIO
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68 empty = _queue.Empty
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69 queue = _queue.Queue
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70
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71 class _pycompatstub(object):
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72 def __init__(self):
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73 self._aliases = {}
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74
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75 def _registeraliases(self, origin, items):
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76 """Add items that will be populated at the first access"""
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77 self._aliases.update((item.replace('_', '').lower(), (origin, item))
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78 for item in items)
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79
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80 def __getattr__(self, name):
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81 try:
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82 origin, item = self._aliases[name]
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83 except KeyError:
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84 raise AttributeError(name)
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85 self.__dict__[name] = obj = getattr(origin, item)
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86 return obj
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87
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88 httpserver = _pycompatstub()
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89 urlreq = _pycompatstub()
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90 urlerr = _pycompatstub()
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91 if not ispy3:
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92 import BaseHTTPServer
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93 import CGIHTTPServer
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94 import SimpleHTTPServer
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95 import urllib2
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96 import urllib
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97 urlreq._registeraliases(urllib, (
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98 "addclosehook",
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99 "addinfourl",
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100 "ftpwrapper",
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101 "pathname2url",
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102 "quote",
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103 "splitattr",
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104 "splitpasswd",
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105 "splitport",
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106 "splituser",
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107 "unquote",
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108 "url2pathname",
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109 "urlencode",
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110 ))
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111 urlreq._registeraliases(urllib2, (
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112 "AbstractHTTPHandler",
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113 "BaseHandler",
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114 "build_opener",
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115 "FileHandler",
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116 "FTPHandler",
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117 "HTTPBasicAuthHandler",
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118 "HTTPDigestAuthHandler",
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119 "HTTPHandler",
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120 "HTTPPasswordMgrWithDefaultRealm",
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121 "HTTPSHandler",
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122 "install_opener",
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123 "ProxyHandler",
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124 "Request",
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125 "urlopen",
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126 ))
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127 urlerr._registeraliases(urllib2, (
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128 "HTTPError",
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129 "URLError",
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130 ))
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131 httpserver._registeraliases(BaseHTTPServer, (
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132 "HTTPServer",
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133 "BaseHTTPRequestHandler",
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134 ))
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135 httpserver._registeraliases(SimpleHTTPServer, (
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136 "SimpleHTTPRequestHandler",
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137 ))
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138 httpserver._registeraliases(CGIHTTPServer, (
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139 "CGIHTTPRequestHandler",
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140 ))
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141
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142 else:
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143 import urllib.request
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144 urlreq._registeraliases(urllib.request, (
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145 "AbstractHTTPHandler",
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146 "addclosehook",
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147 "addinfourl",
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148 "BaseHandler",
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149 "build_opener",
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timeless <timeless@mozdev.org>
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150 "FileHandler",
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151 "FTPHandler",
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152 "ftpwrapper",
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153 "HTTPHandler",
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154 "HTTPSHandler",
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155 "install_opener",
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156 "pathname2url",
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157 "HTTPBasicAuthHandler",
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158 "HTTPDigestAuthHandler",
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159 "HTTPPasswordMgrWithDefaultRealm",
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160 "ProxyHandler",
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161 "quote",
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162 "Request",
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163 "splitattr",
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164 "splitpasswd",
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165 "splitport",
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166 "splituser",
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167 "unquote",
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168 "url2pathname",
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169 "urlopen",
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170 ))
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171 import urllib.error
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172 urlerr._registeraliases(urllib.error, (
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173 "HTTPError",
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174 "URLError",
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175 ))
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176 import http.server
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177 httpserver._registeraliases(http.server, (
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178 "HTTPServer",
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179 "BaseHTTPRequestHandler",
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180 "SimpleHTTPRequestHandler",
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181 "CGIHTTPRequestHandler",
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182 ))