Mercurial > hg
annotate mercurial/pycompat.py @ 30775:513d68a90398
repair: implement requirements checking for upgrades
This commit introduces functionality for upgrading a repository in
place. The first part that's implemented is testing for upgrade
"compatibility." This is done by examining repository requirements.
There are 5 functions returning sets of requirements that control
upgrading. Why so many functions? Mainly to support extensions.
Functions are easier to monkeypatch than module variables.
Astute readers will see that we don't support "manifestv2" and
"treemanifest" requirements in the upgrade mechanism. I don't have
a great answer for why other than this is a complex set of patches
and I don't want to deal with the complexity of these experimental
features just yet. We can teach the upgrade mechanism about them
later, once the basic upgrade mechanism is in place.
This commit also introduces the "upgraderepo" function. This will be
our main routine for performing an in-place upgrade. Currently, it
just implements requirements checking. The structure of some code in
this function may look a bit weird (e.g. the inline function that is
only called once). But this will make sense after future commits.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 18 Dec 2016 16:16:54 -0800 |
parents | caf7e1c5efe4 |
children | 6a70cf94d1b5 |
rev | line source |
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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 getopt |
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14 import os |
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15 import shlex |
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16 import sys |
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17 |
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18 ispy3 = (sys.version_info[0] >= 3) |
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19 |
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20 if not ispy3: |
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21 import cPickle as pickle |
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22 import cStringIO as io |
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23 import httplib |
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24 import Queue as _queue |
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25 import SocketServer as socketserver |
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26 import urlparse |
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27 urlunquote = urlparse.unquote |
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28 import xmlrpclib |
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29 else: |
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30 import http.client as httplib |
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31 import io |
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32 import pickle |
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33 import queue as _queue |
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34 import socketserver |
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35 import urllib.parse as urlparse |
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36 urlunquote = urlparse.unquote_to_bytes |
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37 import xmlrpc.client as xmlrpclib |
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38 |
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39 if ispy3: |
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40 import builtins |
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41 import functools |
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42 fsencode = os.fsencode |
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43 fsdecode = os.fsdecode |
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44 # A bytes version of os.name. |
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45 osname = os.name.encode('ascii') |
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46 ospathsep = os.pathsep.encode('ascii') |
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47 ossep = os.sep.encode('ascii') |
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48 osaltsep = os.altsep |
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49 osgetenv = os.getenvb |
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50 if osaltsep: |
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51 osaltsep = osaltsep.encode('ascii') |
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52 # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which |
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53 # returns bytes. |
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54 getcwd = os.getcwdb |
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55 sysplatform = sys.platform.encode('ascii') |
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56 sysexecutable = sys.executable |
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57 if sysexecutable: |
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58 sysexecutable = os.fsencode(sysexecutable) |
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59 |
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60 # TODO: .buffer might not exist if std streams were replaced; we'll need |
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61 # a silly wrapper to make a bytes stream backed by a unicode one. |
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62 stdin = sys.stdin.buffer |
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63 stdout = sys.stdout.buffer |
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64 stderr = sys.stderr.buffer |
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65 |
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66 # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix, |
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67 # we can use os.fsencode() to get back bytes argv. |
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68 # |
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69 # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55 |
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70 # |
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71 # TODO: On Windows, the native argv is wchar_t, so we'll need a different |
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72 # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior. |
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73 sysargv = list(map(os.fsencode, sys.argv)) |
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74 |
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75 def sysstr(s): |
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76 """Return a keyword str to be passed to Python functions such as |
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77 getattr() and str.encode() |
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78 |
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79 This never raises UnicodeDecodeError. Non-ascii characters are |
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80 considered invalid and mapped to arbitrary but unique code points |
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81 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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82 """ |
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83 if isinstance(s, builtins.str): |
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84 return s |
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85 return s.decode(u'latin-1') |
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86 |
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87 def _wrapattrfunc(f): |
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88 @functools.wraps(f) |
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89 def w(object, name, *args): |
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90 return f(object, sysstr(name), *args) |
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91 return w |
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92 |
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93 # these wrappers are automagically imported by hgloader |
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94 delattr = _wrapattrfunc(builtins.delattr) |
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95 getattr = _wrapattrfunc(builtins.getattr) |
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96 hasattr = _wrapattrfunc(builtins.hasattr) |
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97 setattr = _wrapattrfunc(builtins.setattr) |
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98 xrange = builtins.range |
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99 |
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100 # getopt.getopt() on Python 3 deals with unicodes internally so we cannot |
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101 # pass bytes there. Passing unicodes will result in unicodes as return |
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102 # values which we need to convert again to bytes. |
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103 def getoptb(args, shortlist, namelist): |
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104 args = [a.decode('latin-1') for a in args] |
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105 shortlist = shortlist.decode('latin-1') |
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106 namelist = [a.decode('latin-1') for a in namelist] |
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107 opts, args = getopt.getopt(args, shortlist, namelist) |
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108 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) |
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109 for a in opts] |
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110 args = [a.encode('latin-1') for a in args] |
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111 return opts, args |
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112 |
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113 # keys of keyword arguments in Python need to be strings which are unicodes |
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114 # Python 3. This function takes keyword arguments, convert the keys to str. |
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115 def strkwargs(dic): |
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116 dic = dict((k.decode('latin-1'), v) for k, v in dic.iteritems()) |
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117 return dic |
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118 |
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119 # keys of keyword arguments need to be unicode while passing into |
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120 # a function. This function helps us to convert those keys back to bytes |
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121 # again as we need to deal with bytes. |
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122 def byteskwargs(dic): |
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123 dic = dict((k.encode('latin-1'), v) for k, v in dic.iteritems()) |
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124 return dic |
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125 |
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126 # shlex.split() accepts unicodes on Python 3. This function takes bytes |
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127 # argument, convert it into unicodes, pass into shlex.split(), convert the |
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128 # returned value to bytes and return that. |
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129 # TODO: handle shlex.shlex(). |
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130 def shlexsplit(s): |
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131 ret = shlex.split(s.decode('latin-1')) |
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132 return [a.encode('latin-1') for a in ret] |
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133 |
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134 else: |
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135 def sysstr(s): |
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136 return s |
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137 |
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138 # Partial backport from os.py in Python 3, which only accepts bytes. |
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139 # In Python 2, our paths should only ever be bytes, a unicode path |
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140 # indicates a bug. |
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141 def fsencode(filename): |
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142 if isinstance(filename, str): |
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143 return filename |
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144 else: |
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145 raise TypeError( |
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146 "expect str, not %s" % type(filename).__name__) |
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147 |
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148 # In Python 2, fsdecode() has a very chance to receive bytes. So it's |
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149 # better not to touch Python 2 part as it's already working fine. |
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150 def fsdecode(filename): |
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151 return filename |
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152 |
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153 def getoptb(args, shortlist, namelist): |
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154 return getopt.getopt(args, shortlist, namelist) |
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155 |
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156 def strkwargs(dic): |
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157 return dic |
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158 |
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159 def byteskwargs(dic): |
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160 return dic |
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161 |
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162 osname = os.name |
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163 ospathsep = os.pathsep |
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164 ossep = os.sep |
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165 osaltsep = os.altsep |
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166 stdin = sys.stdin |
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167 stdout = sys.stdout |
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168 stderr = sys.stderr |
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169 sysargv = sys.argv |
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170 sysplatform = sys.platform |
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171 getcwd = os.getcwd |
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172 osgetenv = os.getenv |
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173 sysexecutable = sys.executable |
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174 shlexsplit = shlex.split |
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175 |
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176 stringio = io.StringIO |
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177 empty = _queue.Empty |
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178 queue = _queue.Queue |
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179 |
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180 class _pycompatstub(object): |
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181 def __init__(self): |
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182 self._aliases = {} |
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183 |
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184 def _registeraliases(self, origin, items): |
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185 """Add items that will be populated at the first access""" |
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186 items = map(sysstr, items) |
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187 self._aliases.update( |
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188 (item.replace(sysstr('_'), sysstr('')).lower(), (origin, item)) |
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189 for item in items) |
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190 |
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191 def __getattr__(self, name): |
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192 try: |
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193 origin, item = self._aliases[name] |
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194 except KeyError: |
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195 raise AttributeError(name) |
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196 self.__dict__[name] = obj = getattr(origin, item) |
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197 return obj |
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198 |
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199 httpserver = _pycompatstub() |
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200 urlreq = _pycompatstub() |
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201 urlerr = _pycompatstub() |
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202 if not ispy3: |
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203 import BaseHTTPServer |
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204 import CGIHTTPServer |
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205 import SimpleHTTPServer |
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206 import urllib2 |
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207 import urllib |
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208 urlreq._registeraliases(urllib, ( |
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209 "addclosehook", |
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210 "addinfourl", |
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211 "ftpwrapper", |
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212 "pathname2url", |
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213 "quote", |
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214 "splitattr", |
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215 "splitpasswd", |
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216 "splitport", |
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217 "splituser", |
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218 "unquote", |
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219 "url2pathname", |
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220 "urlencode", |
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221 )) |
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222 urlreq._registeraliases(urllib2, ( |
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223 "AbstractHTTPHandler", |
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224 "BaseHandler", |
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225 "build_opener", |
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226 "FileHandler", |
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227 "FTPHandler", |
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228 "HTTPBasicAuthHandler", |
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229 "HTTPDigestAuthHandler", |
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230 "HTTPHandler", |
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231 "HTTPPasswordMgrWithDefaultRealm", |
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232 "HTTPSHandler", |
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233 "install_opener", |
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234 "ProxyHandler", |
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235 "Request", |
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236 "urlopen", |
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237 )) |
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238 urlerr._registeraliases(urllib2, ( |
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239 "HTTPError", |
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240 "URLError", |
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241 )) |
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242 httpserver._registeraliases(BaseHTTPServer, ( |
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243 "HTTPServer", |
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244 "BaseHTTPRequestHandler", |
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245 )) |
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246 httpserver._registeraliases(SimpleHTTPServer, ( |
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247 "SimpleHTTPRequestHandler", |
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248 )) |
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249 httpserver._registeraliases(CGIHTTPServer, ( |
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250 "CGIHTTPRequestHandler", |
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251 )) |
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252 |
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253 else: |
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254 import urllib.request |
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255 urlreq._registeraliases(urllib.request, ( |
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256 "AbstractHTTPHandler", |
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257 "addclosehook", |
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258 "addinfourl", |
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259 "BaseHandler", |
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260 "build_opener", |
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261 "FileHandler", |
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262 "FTPHandler", |
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263 "ftpwrapper", |
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264 "HTTPHandler", |
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265 "HTTPSHandler", |
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266 "install_opener", |
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267 "pathname2url", |
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268 "HTTPBasicAuthHandler", |
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269 "HTTPDigestAuthHandler", |
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270 "HTTPPasswordMgrWithDefaultRealm", |
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271 "ProxyHandler", |
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272 "quote", |
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273 "Request", |
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274 "splitattr", |
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275 "splitpasswd", |
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276 "splitport", |
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277 "splituser", |
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278 "unquote", |
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279 "url2pathname", |
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280 "urlopen", |
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281 )) |
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282 import urllib.error |
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283 urlerr._registeraliases(urllib.error, ( |
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284 "HTTPError", |
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285 "URLError", |
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286 )) |
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287 import http.server |
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288 httpserver._registeraliases(http.server, ( |
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289 "HTTPServer", |
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290 "BaseHTTPRequestHandler", |
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291 "SimpleHTTPRequestHandler", |
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292 "CGIHTTPRequestHandler", |
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293 )) |