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annotate planemo/lib/python3.7/site-packages/click/_winconsole.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # -*- coding: utf-8 -*-
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2 # This module is based on the excellent work by Adam Bartoš who
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3 # provided a lot of what went into the implementation here in
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4 # the discussion to issue1602 in the Python bug tracker.
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5 #
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6 # There are some general differences in regards to how this works
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7 # compared to the original patches as we do not need to patch
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8 # the entire interpreter but just work in our little world of
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9 # echo and prmopt.
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10 import ctypes
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11 import io
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12 import os
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13 import sys
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14 import time
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15 import zlib
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16 from ctypes import byref
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17 from ctypes import c_char
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18 from ctypes import c_char_p
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19 from ctypes import c_int
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20 from ctypes import c_ssize_t
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21 from ctypes import c_ulong
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22 from ctypes import c_void_p
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23 from ctypes import POINTER
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24 from ctypes import py_object
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25 from ctypes import windll
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26 from ctypes import WinError
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27 from ctypes import WINFUNCTYPE
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28 from ctypes.wintypes import DWORD
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29 from ctypes.wintypes import HANDLE
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30 from ctypes.wintypes import LPCWSTR
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31 from ctypes.wintypes import LPWSTR
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32
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33 import msvcrt
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34
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35 from ._compat import _NonClosingTextIOWrapper
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36 from ._compat import PY2
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37 from ._compat import text_type
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38
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39 try:
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40 from ctypes import pythonapi
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41
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42 PyObject_GetBuffer = pythonapi.PyObject_GetBuffer
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43 PyBuffer_Release = pythonapi.PyBuffer_Release
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44 except ImportError:
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45 pythonapi = None
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46
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47
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48 c_ssize_p = POINTER(c_ssize_t)
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49
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50 kernel32 = windll.kernel32
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51 GetStdHandle = kernel32.GetStdHandle
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52 ReadConsoleW = kernel32.ReadConsoleW
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53 WriteConsoleW = kernel32.WriteConsoleW
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54 GetConsoleMode = kernel32.GetConsoleMode
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55 GetLastError = kernel32.GetLastError
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56 GetCommandLineW = WINFUNCTYPE(LPWSTR)(("GetCommandLineW", windll.kernel32))
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57 CommandLineToArgvW = WINFUNCTYPE(POINTER(LPWSTR), LPCWSTR, POINTER(c_int))(
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58 ("CommandLineToArgvW", windll.shell32)
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59 )
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60 LocalFree = WINFUNCTYPE(ctypes.c_void_p, ctypes.c_void_p)(
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61 ("LocalFree", windll.kernel32)
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62 )
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63
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64
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65 STDIN_HANDLE = GetStdHandle(-10)
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66 STDOUT_HANDLE = GetStdHandle(-11)
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67 STDERR_HANDLE = GetStdHandle(-12)
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68
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69
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70 PyBUF_SIMPLE = 0
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71 PyBUF_WRITABLE = 1
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72
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73 ERROR_SUCCESS = 0
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74 ERROR_NOT_ENOUGH_MEMORY = 8
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75 ERROR_OPERATION_ABORTED = 995
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76
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77 STDIN_FILENO = 0
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78 STDOUT_FILENO = 1
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79 STDERR_FILENO = 2
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80
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81 EOF = b"\x1a"
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82 MAX_BYTES_WRITTEN = 32767
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83
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84
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85 class Py_buffer(ctypes.Structure):
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86 _fields_ = [
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87 ("buf", c_void_p),
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88 ("obj", py_object),
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89 ("len", c_ssize_t),
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90 ("itemsize", c_ssize_t),
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91 ("readonly", c_int),
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92 ("ndim", c_int),
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93 ("format", c_char_p),
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94 ("shape", c_ssize_p),
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95 ("strides", c_ssize_p),
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96 ("suboffsets", c_ssize_p),
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97 ("internal", c_void_p),
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98 ]
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99
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100 if PY2:
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101 _fields_.insert(-1, ("smalltable", c_ssize_t * 2))
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102
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103
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104 # On PyPy we cannot get buffers so our ability to operate here is
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105 # serverly limited.
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106 if pythonapi is None:
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107 get_buffer = None
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108 else:
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109
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110 def get_buffer(obj, writable=False):
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111 buf = Py_buffer()
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112 flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE
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113 PyObject_GetBuffer(py_object(obj), byref(buf), flags)
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114 try:
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115 buffer_type = c_char * buf.len
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116 return buffer_type.from_address(buf.buf)
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117 finally:
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118 PyBuffer_Release(byref(buf))
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119
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120
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121 class _WindowsConsoleRawIOBase(io.RawIOBase):
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122 def __init__(self, handle):
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123 self.handle = handle
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124
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125 def isatty(self):
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126 io.RawIOBase.isatty(self)
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127 return True
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128
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129
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130 class _WindowsConsoleReader(_WindowsConsoleRawIOBase):
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131 def readable(self):
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132 return True
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133
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134 def readinto(self, b):
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135 bytes_to_be_read = len(b)
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136 if not bytes_to_be_read:
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137 return 0
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138 elif bytes_to_be_read % 2:
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139 raise ValueError(
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140 "cannot read odd number of bytes from UTF-16-LE encoded console"
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141 )
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142
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143 buffer = get_buffer(b, writable=True)
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144 code_units_to_be_read = bytes_to_be_read // 2
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145 code_units_read = c_ulong()
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146
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147 rv = ReadConsoleW(
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148 HANDLE(self.handle),
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149 buffer,
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150 code_units_to_be_read,
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151 byref(code_units_read),
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152 None,
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153 )
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154 if GetLastError() == ERROR_OPERATION_ABORTED:
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155 # wait for KeyboardInterrupt
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156 time.sleep(0.1)
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157 if not rv:
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158 raise OSError("Windows error: {}".format(GetLastError()))
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159
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160 if buffer[0] == EOF:
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161 return 0
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162 return 2 * code_units_read.value
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163
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164
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165 class _WindowsConsoleWriter(_WindowsConsoleRawIOBase):
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166 def writable(self):
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167 return True
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168
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169 @staticmethod
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170 def _get_error_message(errno):
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171 if errno == ERROR_SUCCESS:
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172 return "ERROR_SUCCESS"
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173 elif errno == ERROR_NOT_ENOUGH_MEMORY:
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174 return "ERROR_NOT_ENOUGH_MEMORY"
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175 return "Windows error {}".format(errno)
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176
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177 def write(self, b):
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178 bytes_to_be_written = len(b)
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179 buf = get_buffer(b)
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180 code_units_to_be_written = min(bytes_to_be_written, MAX_BYTES_WRITTEN) // 2
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181 code_units_written = c_ulong()
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182
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183 WriteConsoleW(
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184 HANDLE(self.handle),
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185 buf,
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186 code_units_to_be_written,
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187 byref(code_units_written),
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188 None,
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189 )
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190 bytes_written = 2 * code_units_written.value
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191
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192 if bytes_written == 0 and bytes_to_be_written > 0:
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193 raise OSError(self._get_error_message(GetLastError()))
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194 return bytes_written
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195
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196
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197 class ConsoleStream(object):
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198 def __init__(self, text_stream, byte_stream):
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199 self._text_stream = text_stream
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200 self.buffer = byte_stream
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201
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202 @property
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203 def name(self):
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204 return self.buffer.name
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205
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206 def write(self, x):
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207 if isinstance(x, text_type):
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208 return self._text_stream.write(x)
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209 try:
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210 self.flush()
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211 except Exception:
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212 pass
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213 return self.buffer.write(x)
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214
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215 def writelines(self, lines):
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216 for line in lines:
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217 self.write(line)
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218
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219 def __getattr__(self, name):
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220 return getattr(self._text_stream, name)
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221
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222 def isatty(self):
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223 return self.buffer.isatty()
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224
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225 def __repr__(self):
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226 return "<ConsoleStream name={!r} encoding={!r}>".format(
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227 self.name, self.encoding
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228 )
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229
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230
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231 class WindowsChunkedWriter(object):
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232 """
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233 Wraps a stream (such as stdout), acting as a transparent proxy for all
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234 attribute access apart from method 'write()' which we wrap to write in
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235 limited chunks due to a Windows limitation on binary console streams.
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236 """
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237
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238 def __init__(self, wrapped):
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239 # double-underscore everything to prevent clashes with names of
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240 # attributes on the wrapped stream object.
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241 self.__wrapped = wrapped
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242
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243 def __getattr__(self, name):
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244 return getattr(self.__wrapped, name)
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245
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246 def write(self, text):
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247 total_to_write = len(text)
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248 written = 0
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249
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250 while written < total_to_write:
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251 to_write = min(total_to_write - written, MAX_BYTES_WRITTEN)
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252 self.__wrapped.write(text[written : written + to_write])
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253 written += to_write
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254
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255
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256 _wrapped_std_streams = set()
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257
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258
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259 def _wrap_std_stream(name):
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260 # Python 2 & Windows 7 and below
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261 if (
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262 PY2
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263 and sys.getwindowsversion()[:2] <= (6, 1)
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264 and name not in _wrapped_std_streams
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265 ):
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266 setattr(sys, name, WindowsChunkedWriter(getattr(sys, name)))
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267 _wrapped_std_streams.add(name)
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268
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269
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270 def _get_text_stdin(buffer_stream):
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271 text_stream = _NonClosingTextIOWrapper(
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272 io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)),
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273 "utf-16-le",
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274 "strict",
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275 line_buffering=True,
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276 )
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277 return ConsoleStream(text_stream, buffer_stream)
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278
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279
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280 def _get_text_stdout(buffer_stream):
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281 text_stream = _NonClosingTextIOWrapper(
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282 io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)),
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283 "utf-16-le",
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284 "strict",
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285 line_buffering=True,
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286 )
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287 return ConsoleStream(text_stream, buffer_stream)
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288
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289
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290 def _get_text_stderr(buffer_stream):
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291 text_stream = _NonClosingTextIOWrapper(
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292 io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)),
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293 "utf-16-le",
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294 "strict",
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295 line_buffering=True,
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296 )
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297 return ConsoleStream(text_stream, buffer_stream)
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298
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299
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300 if PY2:
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301
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302 def _hash_py_argv():
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303 return zlib.crc32("\x00".join(sys.argv[1:]))
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304
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305 _initial_argv_hash = _hash_py_argv()
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306
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307 def _get_windows_argv():
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308 argc = c_int(0)
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309 argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc))
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310 if not argv_unicode:
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311 raise WinError()
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312 try:
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313 argv = [argv_unicode[i] for i in range(0, argc.value)]
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314 finally:
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315 LocalFree(argv_unicode)
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316 del argv_unicode
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317
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318 if not hasattr(sys, "frozen"):
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319 argv = argv[1:]
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320 while len(argv) > 0:
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321 arg = argv[0]
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322 if not arg.startswith("-") or arg == "-":
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323 break
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324 argv = argv[1:]
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325 if arg.startswith(("-c", "-m")):
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326 break
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327
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328 return argv[1:]
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329
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330
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331 _stream_factories = {
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332 0: _get_text_stdin,
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333 1: _get_text_stdout,
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334 2: _get_text_stderr,
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335 }
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336
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337
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338 def _is_console(f):
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339 if not hasattr(f, "fileno"):
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340 return False
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341
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342 try:
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343 fileno = f.fileno()
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344 except OSError:
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345 return False
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346
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347 handle = msvcrt.get_osfhandle(fileno)
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348 return bool(GetConsoleMode(handle, byref(DWORD())))
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349
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350
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351 def _get_windows_console_stream(f, encoding, errors):
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352 if (
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353 get_buffer is not None
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354 and encoding in ("utf-16-le", None)
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355 and errors in ("strict", None)
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356 and _is_console(f)
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357 ):
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358 func = _stream_factories.get(f.fileno())
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359 if func is not None:
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360 if not PY2:
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361 f = getattr(f, "buffer", None)
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362 if f is None:
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363 return None
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364 else:
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365 # If we are on Python 2 we need to set the stream that we
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366 # deal with to binary mode as otherwise the exercise if a
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367 # bit moot. The same problems apply as for
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368 # get_binary_stdin and friends from _compat.
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369 msvcrt.setmode(f.fileno(), os.O_BINARY)
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370 return func(f)