Mercurial > hg
annotate mercurial/pycompat.py @ 37056:861e9d37e56e
wireproto: buffer output frames when in half duplex mode
Previously, when told that a response was ready, the server reactor
would instruct the caller to send frames immediately. This was OK
as an initial implementation. But it would not work for half-duplex
connections where the sender can't receive until all data has been
transmitted - such as httplib based clients.
In this commit, we teach the reactor that output frames should
be buffered until end of input is seen. This required a new
event to inform the reactor of end of input. The result from that
event will instruct the consumer to send all buffered frames.
The HTTP server is buffered by default.
This change effectively hides the complexity of buffering within
the reactor so that transports need not be concerned about it.
This helps keep the transports "dumb" and will make implementing
multiple requests-responses per atomic exchange (like an HTTP
request) much simpler.
Differential Revision: https://phab.mercurial-scm.org/D2860
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 14 Mar 2018 14:01:16 -0700 |
parents | 644a02f6b34f |
children | 434e520adb8c |
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 os |
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16 import shlex |
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17 import sys |
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18 |
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19 ispy3 = (sys.version_info[0] >= 3) |
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20 ispypy = (r'__pypy__' in sys.builtin_module_names) |
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21 |
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22 if not ispy3: |
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23 import cookielib |
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24 import cPickle as pickle |
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25 import httplib |
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26 import Queue as _queue |
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27 import SocketServer as socketserver |
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28 import xmlrpclib |
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29 else: |
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30 import http.cookiejar as cookielib |
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31 import http.client as httplib |
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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 xmlrpc.client as xmlrpclib |
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36 |
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37 empty = _queue.Empty |
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38 queue = _queue.Queue |
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39 |
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40 def identity(a): |
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41 return a |
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42 |
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43 if ispy3: |
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44 import builtins |
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45 import functools |
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46 import io |
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47 import struct |
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48 |
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49 fsencode = os.fsencode |
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50 fsdecode = os.fsdecode |
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51 oscurdir = os.curdir.encode('ascii') |
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52 oslinesep = os.linesep.encode('ascii') |
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53 osname = os.name.encode('ascii') |
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54 ospathsep = os.pathsep.encode('ascii') |
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55 ospardir = os.pardir.encode('ascii') |
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56 ossep = os.sep.encode('ascii') |
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57 osaltsep = os.altsep |
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58 if osaltsep: |
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59 osaltsep = osaltsep.encode('ascii') |
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60 # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which |
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61 # returns bytes. |
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62 getcwd = os.getcwdb |
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63 sysplatform = sys.platform.encode('ascii') |
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64 sysexecutable = sys.executable |
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65 if sysexecutable: |
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66 sysexecutable = os.fsencode(sysexecutable) |
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67 bytesio = io.BytesIO |
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68 # TODO deprecate stringio name, as it is a lie on Python 3. |
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69 stringio = bytesio |
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70 |
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71 def maplist(*args): |
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72 return list(map(*args)) |
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73 |
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74 def ziplist(*args): |
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75 return list(zip(*args)) |
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76 |
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77 rawinput = input |
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78 getargspec = inspect.getfullargspec |
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79 |
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80 # TODO: .buffer might not exist if std streams were replaced; we'll need |
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81 # a silly wrapper to make a bytes stream backed by a unicode one. |
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82 stdin = sys.stdin.buffer |
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83 stdout = sys.stdout.buffer |
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84 stderr = sys.stderr.buffer |
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85 |
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86 # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix, |
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87 # we can use os.fsencode() to get back bytes argv. |
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88 # |
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89 # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55 |
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90 # |
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91 # TODO: On Windows, the native argv is wchar_t, so we'll need a different |
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92 # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior. |
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93 if getattr(sys, 'argv', None) is not None: |
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94 sysargv = list(map(os.fsencode, sys.argv)) |
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95 |
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96 bytechr = struct.Struct('>B').pack |
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97 byterepr = b'%r'.__mod__ |
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98 |
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99 class bytestr(bytes): |
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100 """A bytes which mostly acts as a Python 2 str |
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101 |
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102 >>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1) |
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103 ('', 'foo', 'ascii', '1') |
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104 >>> s = bytestr(b'foo') |
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105 >>> assert s is bytestr(s) |
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106 |
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107 __bytes__() should be called if provided: |
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108 |
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109 >>> class bytesable(object): |
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110 ... def __bytes__(self): |
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111 ... return b'bytes' |
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112 >>> bytestr(bytesable()) |
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113 'bytes' |
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114 |
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115 There's no implicit conversion from non-ascii str as its encoding is |
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116 unknown: |
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117 |
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118 >>> bytestr(chr(0x80)) # doctest: +ELLIPSIS |
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119 Traceback (most recent call last): |
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120 ... |
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121 UnicodeEncodeError: ... |
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122 |
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123 Comparison between bytestr and bytes should work: |
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124 |
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125 >>> assert bytestr(b'foo') == b'foo' |
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126 >>> assert b'foo' == bytestr(b'foo') |
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127 >>> assert b'f' in bytestr(b'foo') |
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128 >>> assert bytestr(b'f') in b'foo' |
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129 |
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130 Sliced elements should be bytes, not integer: |
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131 |
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132 >>> s[1], s[:2] |
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133 (b'o', b'fo') |
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134 >>> list(s), list(reversed(s)) |
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135 ([b'f', b'o', b'o'], [b'o', b'o', b'f']) |
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136 |
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137 As bytestr type isn't propagated across operations, you need to cast |
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138 bytes to bytestr explicitly: |
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139 |
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140 >>> s = bytestr(b'foo').upper() |
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141 >>> t = bytestr(s) |
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142 >>> s[0], t[0] |
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143 (70, b'F') |
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144 |
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145 Be careful to not pass a bytestr object to a function which expects |
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146 bytearray-like behavior. |
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147 |
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148 >>> t = bytes(t) # cast to bytes |
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149 >>> assert type(t) is bytes |
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150 """ |
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151 |
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152 def __new__(cls, s=b''): |
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153 if isinstance(s, bytestr): |
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154 return s |
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155 if (not isinstance(s, (bytes, bytearray)) |
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156 and not hasattr(s, u'__bytes__')): # hasattr-py3-only |
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157 s = str(s).encode(u'ascii') |
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158 return bytes.__new__(cls, s) |
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159 |
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160 def __getitem__(self, key): |
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161 s = bytes.__getitem__(self, key) |
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162 if not isinstance(s, bytes): |
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163 s = bytechr(s) |
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164 return s |
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165 |
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166 def __iter__(self): |
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167 return iterbytestr(bytes.__iter__(self)) |
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168 |
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169 def __repr__(self): |
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170 return bytes.__repr__(self)[1:] # drop b'' |
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171 |
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172 def iterbytestr(s): |
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173 """Iterate bytes as if it were a str object of Python 2""" |
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174 return map(bytechr, s) |
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175 |
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176 def maybebytestr(s): |
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177 """Promote bytes to bytestr""" |
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178 if isinstance(s, bytes): |
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179 return bytestr(s) |
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180 return s |
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181 |
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182 def sysbytes(s): |
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183 """Convert an internal str (e.g. keyword, __doc__) back to bytes |
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184 |
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185 This never raises UnicodeEncodeError, but only ASCII characters |
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186 can be round-trip by sysstr(sysbytes(s)). |
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187 """ |
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188 return s.encode(u'utf-8') |
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189 |
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190 def sysstr(s): |
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191 """Return a keyword str to be passed to Python functions such as |
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192 getattr() and str.encode() |
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193 |
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194 This never raises UnicodeDecodeError. Non-ascii characters are |
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195 considered invalid and mapped to arbitrary but unique code points |
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196 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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197 """ |
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198 if isinstance(s, builtins.str): |
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199 return s |
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200 return s.decode(u'latin-1') |
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201 |
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202 def strurl(url): |
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203 """Converts a bytes url back to str""" |
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204 if isinstance(url, bytes): |
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205 return url.decode(u'ascii') |
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206 return url |
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207 |
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208 def bytesurl(url): |
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209 """Converts a str url to bytes by encoding in ascii""" |
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210 if isinstance(url, str): |
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211 return url.encode(u'ascii') |
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212 return url |
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213 |
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214 def raisewithtb(exc, tb): |
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215 """Raise exception with the given traceback""" |
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216 raise exc.with_traceback(tb) |
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217 |
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218 def getdoc(obj): |
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219 """Get docstring as bytes; may be None so gettext() won't confuse it |
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220 with _('')""" |
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221 doc = getattr(obj, u'__doc__', None) |
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222 if doc is None: |
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223 return doc |
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224 return sysbytes(doc) |
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225 |
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226 def _wrapattrfunc(f): |
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227 @functools.wraps(f) |
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228 def w(object, name, *args): |
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229 return f(object, sysstr(name), *args) |
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230 return w |
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231 |
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232 # these wrappers are automagically imported by hgloader |
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233 delattr = _wrapattrfunc(builtins.delattr) |
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234 getattr = _wrapattrfunc(builtins.getattr) |
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235 hasattr = _wrapattrfunc(builtins.hasattr) |
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236 setattr = _wrapattrfunc(builtins.setattr) |
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237 xrange = builtins.range |
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238 unicode = str |
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239 |
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240 def open(name, mode='r', buffering=-1, encoding=None): |
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241 return builtins.open(name, sysstr(mode), buffering, encoding) |
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242 |
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243 def _getoptbwrapper(orig, args, shortlist, namelist): |
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244 """ |
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245 Takes bytes arguments, converts them to unicode, pass them to |
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246 getopt.getopt(), convert the returned values back to bytes and then |
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247 return them for Python 3 compatibility as getopt.getopt() don't accepts |
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248 bytes on Python 3. |
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249 """ |
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250 args = [a.decode('latin-1') for a in args] |
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251 shortlist = shortlist.decode('latin-1') |
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252 namelist = [a.decode('latin-1') for a in namelist] |
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253 opts, args = orig(args, shortlist, namelist) |
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254 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) |
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255 for a in opts] |
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256 args = [a.encode('latin-1') for a in args] |
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257 return opts, args |
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258 |
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259 def strkwargs(dic): |
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260 """ |
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261 Converts the keys of a python dictonary to str i.e. unicodes so that |
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262 they can be passed as keyword arguments as dictonaries with bytes keys |
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263 can't be passed as keyword arguments to functions on Python 3. |
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264 """ |
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265 dic = dict((k.decode('latin-1'), v) for k, v in dic.iteritems()) |
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266 return dic |
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267 |
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268 def byteskwargs(dic): |
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269 """ |
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270 Converts keys of python dictonaries to bytes as they were converted to |
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271 str to pass that dictonary as a keyword argument on Python 3. |
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272 """ |
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273 dic = dict((k.encode('latin-1'), v) for k, v in dic.iteritems()) |
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274 return dic |
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275 |
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276 # TODO: handle shlex.shlex(). |
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277 def shlexsplit(s, comments=False, posix=True): |
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278 """ |
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279 Takes bytes argument, convert it to str i.e. unicodes, pass that into |
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280 shlex.split(), convert the returned value to bytes and return that for |
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281 Python 3 compatibility as shelx.split() don't accept bytes on Python 3. |
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282 """ |
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283 ret = shlex.split(s.decode('latin-1'), comments, posix) |
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284 return [a.encode('latin-1') for a in ret] |
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285 |
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286 def emailparser(*args, **kwargs): |
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287 import email.parser |
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288 return email.parser.BytesParser(*args, **kwargs) |
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289 |
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290 else: |
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291 import cStringIO |
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292 |
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293 bytechr = chr |
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294 byterepr = repr |
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295 bytestr = str |
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296 iterbytestr = iter |
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297 maybebytestr = identity |
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298 sysbytes = identity |
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299 sysstr = identity |
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300 strurl = identity |
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301 bytesurl = identity |
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302 |
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303 # this can't be parsed on Python 3 |
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304 exec('def raisewithtb(exc, tb):\n' |
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305 ' raise exc, None, tb\n') |
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306 |
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307 def fsencode(filename): |
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308 """ |
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309 Partial backport from os.py in Python 3, which only accepts bytes. |
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310 In Python 2, our paths should only ever be bytes, a unicode path |
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311 indicates a bug. |
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312 """ |
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313 if isinstance(filename, str): |
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314 return filename |
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315 else: |
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316 raise TypeError( |
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317 "expect str, not %s" % type(filename).__name__) |
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318 |
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319 # In Python 2, fsdecode() has a very chance to receive bytes. So it's |
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320 # better not to touch Python 2 part as it's already working fine. |
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321 fsdecode = identity |
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322 |
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323 def getdoc(obj): |
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324 return getattr(obj, '__doc__', None) |
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325 |
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326 def _getoptbwrapper(orig, args, shortlist, namelist): |
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327 return orig(args, shortlist, namelist) |
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328 |
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329 strkwargs = identity |
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330 byteskwargs = identity |
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331 |
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332 oscurdir = os.curdir |
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333 oslinesep = os.linesep |
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py3: add a bytes version of os.name
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334 osname = os.name |
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py3: have pycompat.ospathsep and pycompat.ossep
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335 ospathsep = os.pathsep |
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336 ospardir = os.pardir |
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337 ossep = os.sep |
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338 osaltsep = os.altsep |
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py3: provide bytes stdin/out/err through util module
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339 stdin = sys.stdin |
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340 stdout = sys.stdout |
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341 stderr = sys.stderr |
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342 if getattr(sys, 'argv', None) is not None: |
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343 sysargv = sys.argv |
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344 sysplatform = sys.platform |
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345 getcwd = os.getcwd |
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346 sysexecutable = sys.executable |
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347 shlexsplit = shlex.split |
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util: prefer "bytesio" to "stringio"
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348 bytesio = cStringIO.StringIO |
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349 stringio = bytesio |
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350 maplist = map |
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py3: introduce pycompat.ziplist as zip is a generator on Python 3
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351 ziplist = zip |
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352 rawinput = raw_input |
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py3: introduce and use pycompat.getargspec
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353 getargspec = inspect.getargspec |
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selectors2: do not use platform.system()
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354 |
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py3: use email parser that operates on bytes
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355 def emailparser(*args, **kwargs): |
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356 import email.parser |
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357 return email.parser.Parser(*args, **kwargs) |
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358 |
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359 isjython = sysplatform.startswith('java') |
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360 |
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361 isdarwin = sysplatform == 'darwin' |
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362 isposix = osname == 'posix' |
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363 iswindows = osname == 'nt' |
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fancyopts: use getopt.gnu_getopt()
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364 |
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365 def getoptb(args, shortlist, namelist): |
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366 return _getoptbwrapper(getopt.getopt, args, shortlist, namelist) |
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367 |
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368 def gnugetoptb(args, shortlist, namelist): |
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369 return _getoptbwrapper(getopt.gnu_getopt, args, shortlist, namelist) |