Mercurial > hg
annotate mercurial/pycompat.py @ 45438:ed95ccc94333
rhg: pass `ui` to `Command` `run`
Allow implementation of `From<clap::ArgMatches> for Command`
Differential Revision: https://phab.mercurial-scm.org/D8954
author | Antoine Cezar <antoine.cezar@octobus.net> |
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date | Tue, 04 Aug 2020 16:11:23 +0200 |
parents | 9694895749ad |
children | d1072cba8aff |
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 inspect |
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15 import json |
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16 import os |
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17 import shlex |
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18 import sys |
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19 import tempfile |
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20 |
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21 ispy3 = sys.version_info[0] >= 3 |
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22 ispypy = '__pypy__' in sys.builtin_module_names |
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23 TYPE_CHECKING = False |
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24 |
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25 if not globals(): # hide this from non-pytype users |
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26 import typing |
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27 |
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28 TYPE_CHECKING = typing.TYPE_CHECKING |
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29 |
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30 if not ispy3: |
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31 import cookielib |
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32 import cPickle as pickle |
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33 import httplib |
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34 import Queue as queue |
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35 import SocketServer as socketserver |
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36 import xmlrpclib |
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37 |
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38 from .thirdparty.concurrent import futures |
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39 |
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40 def future_set_exception_info(f, exc_info): |
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41 f.set_exception_info(*exc_info) |
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42 |
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43 |
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44 else: |
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45 import concurrent.futures as futures |
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46 import http.cookiejar as cookielib |
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47 import http.client as httplib |
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48 import pickle |
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49 import queue as queue |
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50 import socketserver |
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51 import xmlrpc.client as xmlrpclib |
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52 |
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53 def future_set_exception_info(f, exc_info): |
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54 f.set_exception(exc_info[0]) |
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55 |
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56 |
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57 def identity(a): |
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58 return a |
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59 |
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60 |
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61 def _rapply(f, xs): |
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62 if xs is None: |
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63 # assume None means non-value of optional data |
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64 return xs |
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65 if isinstance(xs, (list, set, tuple)): |
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66 return type(xs)(_rapply(f, x) for x in xs) |
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67 if isinstance(xs, dict): |
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68 return type(xs)((_rapply(f, k), _rapply(f, v)) for k, v in xs.items()) |
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69 return f(xs) |
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70 |
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71 |
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72 def rapply(f, xs): |
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73 """Apply function recursively to every item preserving the data structure |
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74 |
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75 >>> def f(x): |
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76 ... return 'f(%s)' % x |
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77 >>> rapply(f, None) is None |
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78 True |
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79 >>> rapply(f, 'a') |
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80 'f(a)' |
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81 >>> rapply(f, {'a'}) == {'f(a)'} |
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82 True |
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83 >>> rapply(f, ['a', 'b', None, {'c': 'd'}, []]) |
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84 ['f(a)', 'f(b)', None, {'f(c)': 'f(d)'}, []] |
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85 |
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86 >>> xs = [object()] |
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87 >>> rapply(identity, xs) is xs |
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88 True |
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89 """ |
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90 if f is identity: |
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91 # fast path mainly for py2 |
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92 return xs |
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93 return _rapply(f, xs) |
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94 |
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95 |
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96 if ispy3: |
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97 import builtins |
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98 import codecs |
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99 import functools |
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100 import io |
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101 import struct |
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102 |
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103 if os.name == r'nt' and sys.version_info >= (3, 6): |
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104 # MBCS (or ANSI) filesystem encoding must be used as before. |
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105 # Otherwise non-ASCII filenames in existing repositories would be |
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106 # corrupted. |
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107 # This must be set once prior to any fsencode/fsdecode calls. |
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108 sys._enablelegacywindowsfsencoding() # pytype: disable=module-attr |
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109 |
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110 fsencode = os.fsencode |
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111 fsdecode = os.fsdecode |
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112 oscurdir = os.curdir.encode('ascii') |
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113 oslinesep = os.linesep.encode('ascii') |
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114 osname = os.name.encode('ascii') |
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115 ospathsep = os.pathsep.encode('ascii') |
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116 ospardir = os.pardir.encode('ascii') |
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117 ossep = os.sep.encode('ascii') |
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118 osaltsep = os.altsep |
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119 if osaltsep: |
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120 osaltsep = osaltsep.encode('ascii') |
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121 osdevnull = os.devnull.encode('ascii') |
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122 |
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123 sysplatform = sys.platform.encode('ascii') |
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124 sysexecutable = sys.executable |
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125 if sysexecutable: |
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126 sysexecutable = os.fsencode(sysexecutable) |
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127 bytesio = io.BytesIO |
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128 # TODO deprecate stringio name, as it is a lie on Python 3. |
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129 stringio = bytesio |
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130 |
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131 def maplist(*args): |
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132 return list(map(*args)) |
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133 |
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134 def rangelist(*args): |
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135 return list(range(*args)) |
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136 |
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137 def ziplist(*args): |
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138 return list(zip(*args)) |
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139 |
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140 rawinput = input |
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141 getargspec = inspect.getfullargspec |
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142 |
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143 long = int |
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144 |
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145 if getattr(sys, 'argv', None) is not None: |
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146 # On POSIX, the char** argv array is converted to Python str using |
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147 # Py_DecodeLocale(). The inverse of this is Py_EncodeLocale(), which |
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148 # isn't directly callable from Python code. In practice, os.fsencode() |
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149 # can be used instead (this is recommended by Python's documentation |
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150 # for sys.argv). |
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151 # |
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152 # On Windows, the wchar_t **argv is passed into the interpreter as-is. |
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153 # Like POSIX, we need to emulate what Py_EncodeLocale() would do. But |
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154 # there's an additional wrinkle. What we really want to access is the |
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155 # ANSI codepage representation of the arguments, as this is what |
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156 # `int main()` would receive if Python 3 didn't define `int wmain()` |
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157 # (this is how Python 2 worked). To get that, we encode with the mbcs |
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158 # encoding, which will pass CP_ACP to the underlying Windows API to |
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159 # produce bytes. |
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160 if os.name == r'nt': |
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161 sysargv = [a.encode("mbcs", "ignore") for a in sys.argv] |
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162 else: |
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163 sysargv = [fsencode(a) for a in sys.argv] |
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164 |
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165 bytechr = struct.Struct('>B').pack |
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166 byterepr = b'%r'.__mod__ |
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167 |
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168 class bytestr(bytes): |
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169 """A bytes which mostly acts as a Python 2 str |
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170 |
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171 >>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1) |
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172 ('', 'foo', 'ascii', '1') |
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173 >>> s = bytestr(b'foo') |
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174 >>> assert s is bytestr(s) |
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175 |
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176 __bytes__() should be called if provided: |
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177 |
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178 >>> class bytesable(object): |
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179 ... def __bytes__(self): |
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180 ... return b'bytes' |
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181 >>> bytestr(bytesable()) |
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182 'bytes' |
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183 |
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184 There's no implicit conversion from non-ascii str as its encoding is |
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185 unknown: |
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186 |
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187 >>> bytestr(chr(0x80)) # doctest: +ELLIPSIS |
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188 Traceback (most recent call last): |
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189 ... |
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190 UnicodeEncodeError: ... |
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191 |
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192 Comparison between bytestr and bytes should work: |
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193 |
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194 >>> assert bytestr(b'foo') == b'foo' |
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195 >>> assert b'foo' == bytestr(b'foo') |
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196 >>> assert b'f' in bytestr(b'foo') |
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197 >>> assert bytestr(b'f') in b'foo' |
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198 |
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199 Sliced elements should be bytes, not integer: |
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200 |
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201 >>> s[1], s[:2] |
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202 (b'o', b'fo') |
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203 >>> list(s), list(reversed(s)) |
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204 ([b'f', b'o', b'o'], [b'o', b'o', b'f']) |
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205 |
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206 As bytestr type isn't propagated across operations, you need to cast |
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207 bytes to bytestr explicitly: |
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208 |
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209 >>> s = bytestr(b'foo').upper() |
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210 >>> t = bytestr(s) |
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211 >>> s[0], t[0] |
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212 (70, b'F') |
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213 |
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214 Be careful to not pass a bytestr object to a function which expects |
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215 bytearray-like behavior. |
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216 |
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217 >>> t = bytes(t) # cast to bytes |
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218 >>> assert type(t) is bytes |
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219 """ |
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220 |
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221 def __new__(cls, s=b''): |
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222 if isinstance(s, bytestr): |
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223 return s |
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224 if not isinstance( |
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225 s, (bytes, bytearray) |
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226 ) and not hasattr( # hasattr-py3-only |
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227 s, u'__bytes__' |
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228 ): |
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229 s = str(s).encode('ascii') |
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230 return bytes.__new__(cls, s) |
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231 |
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232 def __getitem__(self, key): |
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233 s = bytes.__getitem__(self, key) |
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234 if not isinstance(s, bytes): |
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235 s = bytechr(s) |
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236 return s |
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237 |
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238 def __iter__(self): |
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239 return iterbytestr(bytes.__iter__(self)) |
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240 |
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241 def __repr__(self): |
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242 return bytes.__repr__(self)[1:] # drop b'' |
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243 |
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244 def iterbytestr(s): |
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245 """Iterate bytes as if it were a str object of Python 2""" |
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246 return map(bytechr, s) |
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247 |
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248 def maybebytestr(s): |
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249 """Promote bytes to bytestr""" |
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250 if isinstance(s, bytes): |
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251 return bytestr(s) |
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252 return s |
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253 |
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254 def sysbytes(s): |
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255 """Convert an internal str (e.g. keyword, __doc__) back to bytes |
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256 |
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257 This never raises UnicodeEncodeError, but only ASCII characters |
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258 can be round-trip by sysstr(sysbytes(s)). |
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259 """ |
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260 if isinstance(s, bytes): |
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261 return s |
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262 return s.encode('utf-8') |
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263 |
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264 def sysstr(s): |
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265 """Return a keyword str to be passed to Python functions such as |
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266 getattr() and str.encode() |
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267 |
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268 This never raises UnicodeDecodeError. Non-ascii characters are |
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269 considered invalid and mapped to arbitrary but unique code points |
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270 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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271 """ |
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272 if isinstance(s, builtins.str): |
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273 return s |
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274 return s.decode('latin-1') |
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275 |
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276 def strurl(url): |
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277 """Converts a bytes url back to str""" |
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278 if isinstance(url, bytes): |
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279 return url.decode('ascii') |
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280 return url |
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281 |
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282 def bytesurl(url): |
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283 """Converts a str url to bytes by encoding in ascii""" |
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284 if isinstance(url, str): |
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285 return url.encode('ascii') |
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286 return url |
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287 |
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288 def raisewithtb(exc, tb): |
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289 """Raise exception with the given traceback""" |
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290 raise exc.with_traceback(tb) |
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291 |
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292 def getdoc(obj): |
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293 """Get docstring as bytes; may be None so gettext() won't confuse it |
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294 with _('')""" |
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295 doc = getattr(obj, '__doc__', None) |
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296 if doc is None: |
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297 return doc |
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298 return sysbytes(doc) |
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299 |
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300 def _wrapattrfunc(f): |
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301 @functools.wraps(f) |
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302 def w(object, name, *args): |
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303 return f(object, sysstr(name), *args) |
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304 |
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305 return w |
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306 |
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307 # these wrappers are automagically imported by hgloader |
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308 delattr = _wrapattrfunc(builtins.delattr) |
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309 getattr = _wrapattrfunc(builtins.getattr) |
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310 hasattr = _wrapattrfunc(builtins.hasattr) |
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311 setattr = _wrapattrfunc(builtins.setattr) |
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312 xrange = builtins.range |
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313 unicode = str |
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314 |
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315 def open(name, mode=b'r', buffering=-1, encoding=None): |
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316 return builtins.open(name, sysstr(mode), buffering, encoding) |
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317 |
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318 safehasattr = _wrapattrfunc(builtins.hasattr) |
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319 |
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320 def _getoptbwrapper(orig, args, shortlist, namelist): |
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321 """ |
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322 Takes bytes arguments, converts them to unicode, pass them to |
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323 getopt.getopt(), convert the returned values back to bytes and then |
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324 return them for Python 3 compatibility as getopt.getopt() don't accepts |
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325 bytes on Python 3. |
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326 """ |
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327 args = [a.decode('latin-1') for a in args] |
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328 shortlist = shortlist.decode('latin-1') |
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329 namelist = [a.decode('latin-1') for a in namelist] |
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330 opts, args = orig(args, shortlist, namelist) |
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331 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) for a in opts] |
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332 args = [a.encode('latin-1') for a in args] |
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333 return opts, args |
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334 |
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335 def strkwargs(dic): |
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336 """ |
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337 Converts the keys of a python dictonary to str i.e. unicodes so that |
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338 they can be passed as keyword arguments as dictonaries with bytes keys |
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339 can't be passed as keyword arguments to functions on Python 3. |
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340 """ |
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341 dic = {k.decode('latin-1'): v for k, v in dic.items()} |
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342 return dic |
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343 |
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344 def byteskwargs(dic): |
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345 """ |
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346 Converts keys of python dictonaries to bytes as they were converted to |
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347 str to pass that dictonary as a keyword argument on Python 3. |
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348 """ |
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349 dic = {k.encode('latin-1'): v for k, v in dic.items()} |
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350 return dic |
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351 |
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352 # TODO: handle shlex.shlex(). |
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353 def shlexsplit(s, comments=False, posix=True): |
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354 """ |
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355 Takes bytes argument, convert it to str i.e. unicodes, pass that into |
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356 shlex.split(), convert the returned value to bytes and return that for |
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357 Python 3 compatibility as shelx.split() don't accept bytes on Python 3. |
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358 """ |
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359 ret = shlex.split(s.decode('latin-1'), comments, posix) |
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360 return [a.encode('latin-1') for a in ret] |
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361 |
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362 iteritems = lambda x: x.items() |
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363 itervalues = lambda x: x.values() |
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364 |
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365 # Python 3.5's json.load and json.loads require str. We polyfill its |
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366 # code for detecting encoding from bytes. |
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367 if sys.version_info[0:2] < (3, 6): |
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368 |
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369 def _detect_encoding(b): |
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370 bstartswith = b.startswith |
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371 if bstartswith((codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE)): |
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372 return 'utf-32' |
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373 if bstartswith((codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE)): |
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374 return 'utf-16' |
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375 if bstartswith(codecs.BOM_UTF8): |
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376 return 'utf-8-sig' |
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377 |
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378 if len(b) >= 4: |
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379 if not b[0]: |
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380 # 00 00 -- -- - utf-32-be |
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381 # 00 XX -- -- - utf-16-be |
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382 return 'utf-16-be' if b[1] else 'utf-32-be' |
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383 if not b[1]: |
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384 # XX 00 00 00 - utf-32-le |
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385 # XX 00 00 XX - utf-16-le |
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386 # XX 00 XX -- - utf-16-le |
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387 return 'utf-16-le' if b[2] or b[3] else 'utf-32-le' |
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388 elif len(b) == 2: |
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389 if not b[0]: |
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390 # 00 XX - utf-16-be |
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391 return 'utf-16-be' |
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392 if not b[1]: |
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393 # XX 00 - utf-16-le |
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394 return 'utf-16-le' |
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395 # default |
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396 return 'utf-8' |
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397 |
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398 def json_loads(s, *args, **kwargs): |
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399 if isinstance(s, (bytes, bytearray)): |
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400 s = s.decode(_detect_encoding(s), 'surrogatepass') |
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401 |
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402 return json.loads(s, *args, **kwargs) |
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403 |
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404 else: |
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405 json_loads = json.loads |
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406 |
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407 else: |
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408 import cStringIO |
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409 |
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410 xrange = xrange |
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411 unicode = unicode |
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412 bytechr = chr |
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413 byterepr = repr |
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414 bytestr = str |
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415 iterbytestr = iter |
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416 maybebytestr = identity |
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417 sysbytes = identity |
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418 sysstr = identity |
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419 strurl = identity |
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420 bytesurl = identity |
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421 open = open |
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422 delattr = delattr |
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423 getattr = getattr |
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424 hasattr = hasattr |
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425 setattr = setattr |
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426 |
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427 # this can't be parsed on Python 3 |
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428 exec(b'def raisewithtb(exc, tb):\n raise exc, None, tb\n') |
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429 |
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430 def fsencode(filename): |
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431 """ |
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432 Partial backport from os.py in Python 3, which only accepts bytes. |
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433 In Python 2, our paths should only ever be bytes, a unicode path |
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434 indicates a bug. |
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435 """ |
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436 if isinstance(filename, str): |
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437 return filename |
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438 else: |
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439 raise TypeError("expect str, not %s" % type(filename).__name__) |
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440 |
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441 # In Python 2, fsdecode() has a very chance to receive bytes. So it's |
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442 # better not to touch Python 2 part as it's already working fine. |
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443 fsdecode = identity |
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444 |
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445 def getdoc(obj): |
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446 return getattr(obj, '__doc__', None) |
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447 |
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448 _notset = object() |
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449 |
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450 def safehasattr(thing, attr): |
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451 return getattr(thing, attr, _notset) is not _notset |
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452 |
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453 def _getoptbwrapper(orig, args, shortlist, namelist): |
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454 return orig(args, shortlist, namelist) |
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455 |
31774
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pycompat: introduce identity function as a compat stub
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456 strkwargs = identity |
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457 byteskwargs = identity |
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py3: utility functions to convert keys of kwargs to bytes/unicodes
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458 |
36648
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py3: make os.curdir a bytes
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459 oscurdir = os.curdir |
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pycompat: provide bytes os.linesep
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460 oslinesep = os.linesep |
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py3: add a bytes version of os.name
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461 osname = os.name |
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py3: have pycompat.ospathsep and pycompat.ossep
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462 ospathsep = os.pathsep |
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463 ospardir = os.pardir |
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464 ossep = os.sep |
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465 osaltsep = os.altsep |
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py3: make a pycompat.osdevnull, use it in extdiff
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466 osdevnull = os.devnull |
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cbor: teach the encoder to handle python `long` type for Windows
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467 long = long |
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pycompat: verify sys.argv exists before forwarding it (issue5493)
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468 if getattr(sys, 'argv', None) is not None: |
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469 sysargv = sys.argv |
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py3: have a bytes version of sys.platform
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470 sysplatform = sys.platform |
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py3: have bytes version of sys.executable
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471 sysexecutable = sys.executable |
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472 shlexsplit = shlex.split |
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util: prefer "bytesio" to "stringio"
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473 bytesio = cStringIO.StringIO |
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474 stringio = bytesio |
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pycompat: add maplist alias for old map behavior
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475 maplist = map |
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annotate: do not construct attr.s object per line while computing history
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476 rangelist = range |
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py3: introduce pycompat.ziplist as zip is a generator on Python 3
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477 ziplist = zip |
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py3: select input or raw_input by pycompat
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478 rawinput = raw_input |
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py3: introduce and use pycompat.getargspec
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479 getargspec = inspect.getargspec |
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py3: define and use pycompat.iteritems() for hgext/
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480 iteritems = lambda x: x.iteritems() |
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py3: define and use pycompat.itervalues()
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481 itervalues = lambda x: x.itervalues() |
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py3: define and use json.loads polyfill
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482 json_loads = json.loads |
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selectors2: do not use platform.system()
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483 |
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py3: byteify strings in pycompat
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484 isjython = sysplatform.startswith(b'java') |
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pycompat: define operating system constants
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485 |
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486 isdarwin = sysplatform.startswith(b'darwin') |
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487 islinux = sysplatform.startswith(b'linux') |
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488 isposix = osname == b'posix' |
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489 iswindows = osname == b'nt' |
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490 |
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491 |
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492 def getoptb(args, shortlist, namelist): |
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493 return _getoptbwrapper(getopt.getopt, args, shortlist, namelist) |
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494 |
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495 |
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496 def gnugetoptb(args, shortlist, namelist): |
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497 return _getoptbwrapper(getopt.gnu_getopt, args, shortlist, namelist) |
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498 |
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499 |
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py3: wrap tempfile.mkdtemp() to use bytes path
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500 def mkdtemp(suffix=b'', prefix=b'tmp', dir=None): |
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501 return tempfile.mkdtemp(suffix, prefix, dir) |
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502 |
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503 |
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504 # text=True is not supported; use util.from/tonativeeol() instead |
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505 def mkstemp(suffix=b'', prefix=b'tmp', dir=None): |
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506 return tempfile.mkstemp(suffix, prefix, dir) |
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py3: wrap tempfile.NamedTemporaryFile() to return bytes fp.name
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507 |
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508 |
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509 # mode must include 'b'ytes as encoding= is not supported |
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510 def namedtempfile( |
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511 mode=b'w+b', bufsize=-1, suffix=b'', prefix=b'tmp', dir=None, delete=True |
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512 ): |
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513 mode = sysstr(mode) |
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cleanup: remove pointless r-prefixes on single-quoted strings
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514 assert 'b' in mode |
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515 return tempfile.NamedTemporaryFile( |
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516 mode, bufsize, suffix=suffix, prefix=prefix, dir=dir, delete=delete |
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517 ) |