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annotate venv/lib/python2.7/codecs.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 """ codecs -- Python Codec Registry, API and helpers.
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2
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3
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4 Written by Marc-Andre Lemburg (mal@lemburg.com).
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5
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6 (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
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7
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8 """#"
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9
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10 import __builtin__, sys
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11
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12 ### Registry and builtin stateless codec functions
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13
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14 try:
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15 from _codecs import *
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16 except ImportError, why:
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17 raise SystemError('Failed to load the builtin codecs: %s' % why)
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18
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19 __all__ = ["register", "lookup", "open", "EncodedFile", "BOM", "BOM_BE",
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20 "BOM_LE", "BOM32_BE", "BOM32_LE", "BOM64_BE", "BOM64_LE",
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21 "BOM_UTF8", "BOM_UTF16", "BOM_UTF16_LE", "BOM_UTF16_BE",
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22 "BOM_UTF32", "BOM_UTF32_LE", "BOM_UTF32_BE",
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23 "CodecInfo", "Codec", "IncrementalEncoder", "IncrementalDecoder",
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24 "StreamReader", "StreamWriter",
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25 "StreamReaderWriter", "StreamRecoder",
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26 "getencoder", "getdecoder", "getincrementalencoder",
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27 "getincrementaldecoder", "getreader", "getwriter",
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28 "encode", "decode", "iterencode", "iterdecode",
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29 "strict_errors", "ignore_errors", "replace_errors",
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30 "xmlcharrefreplace_errors", "backslashreplace_errors",
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31 "register_error", "lookup_error"]
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32
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33 ### Constants
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34
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35 #
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36 # Byte Order Mark (BOM = ZERO WIDTH NO-BREAK SPACE = U+FEFF)
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37 # and its possible byte string values
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38 # for UTF8/UTF16/UTF32 output and little/big endian machines
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39 #
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40
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41 # UTF-8
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42 BOM_UTF8 = '\xef\xbb\xbf'
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43
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44 # UTF-16, little endian
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45 BOM_LE = BOM_UTF16_LE = '\xff\xfe'
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46
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47 # UTF-16, big endian
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48 BOM_BE = BOM_UTF16_BE = '\xfe\xff'
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49
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50 # UTF-32, little endian
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51 BOM_UTF32_LE = '\xff\xfe\x00\x00'
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52
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53 # UTF-32, big endian
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54 BOM_UTF32_BE = '\x00\x00\xfe\xff'
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55
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56 if sys.byteorder == 'little':
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57
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58 # UTF-16, native endianness
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59 BOM = BOM_UTF16 = BOM_UTF16_LE
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60
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61 # UTF-32, native endianness
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62 BOM_UTF32 = BOM_UTF32_LE
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63
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64 else:
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65
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66 # UTF-16, native endianness
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67 BOM = BOM_UTF16 = BOM_UTF16_BE
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68
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69 # UTF-32, native endianness
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70 BOM_UTF32 = BOM_UTF32_BE
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71
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72 # Old broken names (don't use in new code)
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73 BOM32_LE = BOM_UTF16_LE
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74 BOM32_BE = BOM_UTF16_BE
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75 BOM64_LE = BOM_UTF32_LE
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76 BOM64_BE = BOM_UTF32_BE
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77
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78
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79 ### Codec base classes (defining the API)
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80
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81 class CodecInfo(tuple):
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82
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83 def __new__(cls, encode, decode, streamreader=None, streamwriter=None,
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84 incrementalencoder=None, incrementaldecoder=None, name=None):
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85 self = tuple.__new__(cls, (encode, decode, streamreader, streamwriter))
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86 self.name = name
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87 self.encode = encode
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88 self.decode = decode
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89 self.incrementalencoder = incrementalencoder
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90 self.incrementaldecoder = incrementaldecoder
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91 self.streamwriter = streamwriter
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92 self.streamreader = streamreader
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93 return self
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94
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95 def __repr__(self):
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96 return "<%s.%s object for encoding %s at 0x%x>" % (self.__class__.__module__, self.__class__.__name__, self.name, id(self))
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97
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98 class Codec:
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99
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100 """ Defines the interface for stateless encoders/decoders.
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101
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102 The .encode()/.decode() methods may use different error
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103 handling schemes by providing the errors argument. These
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104 string values are predefined:
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105
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106 'strict' - raise a ValueError error (or a subclass)
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107 'ignore' - ignore the character and continue with the next
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108 'replace' - replace with a suitable replacement character;
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109 Python will use the official U+FFFD REPLACEMENT
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110 CHARACTER for the builtin Unicode codecs on
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111 decoding and '?' on encoding.
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112 'xmlcharrefreplace' - Replace with the appropriate XML
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113 character reference (only for encoding).
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114 'backslashreplace' - Replace with backslashed escape sequences
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115 (only for encoding).
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116
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117 The set of allowed values can be extended via register_error.
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118
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119 """
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120 def encode(self, input, errors='strict'):
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121
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122 """ Encodes the object input and returns a tuple (output
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123 object, length consumed).
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124
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125 errors defines the error handling to apply. It defaults to
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126 'strict' handling.
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127
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128 The method may not store state in the Codec instance. Use
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129 StreamCodec for codecs which have to keep state in order to
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130 make encoding/decoding efficient.
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131
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132 The encoder must be able to handle zero length input and
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133 return an empty object of the output object type in this
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134 situation.
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135
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136 """
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137 raise NotImplementedError
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138
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139 def decode(self, input, errors='strict'):
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140
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141 """ Decodes the object input and returns a tuple (output
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142 object, length consumed).
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143
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144 input must be an object which provides the bf_getreadbuf
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145 buffer slot. Python strings, buffer objects and memory
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146 mapped files are examples of objects providing this slot.
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147
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148 errors defines the error handling to apply. It defaults to
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149 'strict' handling.
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150
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151 The method may not store state in the Codec instance. Use
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152 StreamCodec for codecs which have to keep state in order to
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153 make encoding/decoding efficient.
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154
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155 The decoder must be able to handle zero length input and
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156 return an empty object of the output object type in this
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157 situation.
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158
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159 """
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160 raise NotImplementedError
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161
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162 class IncrementalEncoder(object):
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163 """
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164 An IncrementalEncoder encodes an input in multiple steps. The input can be
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165 passed piece by piece to the encode() method. The IncrementalEncoder remembers
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166 the state of the Encoding process between calls to encode().
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167 """
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168 def __init__(self, errors='strict'):
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169 """
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170 Creates an IncrementalEncoder instance.
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171
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172 The IncrementalEncoder may use different error handling schemes by
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173 providing the errors keyword argument. See the module docstring
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174 for a list of possible values.
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175 """
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176 self.errors = errors
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177 self.buffer = ""
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178
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179 def encode(self, input, final=False):
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180 """
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181 Encodes input and returns the resulting object.
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182 """
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183 raise NotImplementedError
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184
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185 def reset(self):
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186 """
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187 Resets the encoder to the initial state.
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188 """
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189
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190 def getstate(self):
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191 """
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192 Return the current state of the encoder.
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193 """
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194 return 0
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195
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196 def setstate(self, state):
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197 """
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198 Set the current state of the encoder. state must have been
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199 returned by getstate().
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200 """
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201
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202 class BufferedIncrementalEncoder(IncrementalEncoder):
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203 """
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204 This subclass of IncrementalEncoder can be used as the baseclass for an
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205 incremental encoder if the encoder must keep some of the output in a
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206 buffer between calls to encode().
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207 """
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208 def __init__(self, errors='strict'):
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209 IncrementalEncoder.__init__(self, errors)
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210 self.buffer = "" # unencoded input that is kept between calls to encode()
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211
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212 def _buffer_encode(self, input, errors, final):
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213 # Overwrite this method in subclasses: It must encode input
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214 # and return an (output, length consumed) tuple
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215 raise NotImplementedError
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216
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217 def encode(self, input, final=False):
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218 # encode input (taking the buffer into account)
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219 data = self.buffer + input
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220 (result, consumed) = self._buffer_encode(data, self.errors, final)
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221 # keep unencoded input until the next call
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222 self.buffer = data[consumed:]
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223 return result
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224
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225 def reset(self):
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226 IncrementalEncoder.reset(self)
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227 self.buffer = ""
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228
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229 def getstate(self):
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230 return self.buffer or 0
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231
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232 def setstate(self, state):
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233 self.buffer = state or ""
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234
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235 class IncrementalDecoder(object):
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236 """
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237 An IncrementalDecoder decodes an input in multiple steps. The input can be
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238 passed piece by piece to the decode() method. The IncrementalDecoder
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239 remembers the state of the decoding process between calls to decode().
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240 """
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241 def __init__(self, errors='strict'):
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242 """
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243 Creates a IncrementalDecoder instance.
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244
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245 The IncrementalDecoder may use different error handling schemes by
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246 providing the errors keyword argument. See the module docstring
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247 for a list of possible values.
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248 """
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249 self.errors = errors
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250
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251 def decode(self, input, final=False):
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252 """
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253 Decodes input and returns the resulting object.
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254 """
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255 raise NotImplementedError
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256
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257 def reset(self):
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258 """
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259 Resets the decoder to the initial state.
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260 """
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261
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262 def getstate(self):
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263 """
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264 Return the current state of the decoder.
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265
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266 This must be a (buffered_input, additional_state_info) tuple.
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267 buffered_input must be a bytes object containing bytes that
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268 were passed to decode() that have not yet been converted.
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269 additional_state_info must be a non-negative integer
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270 representing the state of the decoder WITHOUT yet having
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271 processed the contents of buffered_input. In the initial state
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272 and after reset(), getstate() must return (b"", 0).
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273 """
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274 return (b"", 0)
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275
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276 def setstate(self, state):
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277 """
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278 Set the current state of the decoder.
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279
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280 state must have been returned by getstate(). The effect of
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281 setstate((b"", 0)) must be equivalent to reset().
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282 """
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283
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284 class BufferedIncrementalDecoder(IncrementalDecoder):
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285 """
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286 This subclass of IncrementalDecoder can be used as the baseclass for an
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287 incremental decoder if the decoder must be able to handle incomplete byte
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288 sequences.
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289 """
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290 def __init__(self, errors='strict'):
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291 IncrementalDecoder.__init__(self, errors)
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292 self.buffer = "" # undecoded input that is kept between calls to decode()
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293
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294 def _buffer_decode(self, input, errors, final):
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295 # Overwrite this method in subclasses: It must decode input
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296 # and return an (output, length consumed) tuple
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297 raise NotImplementedError
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298
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299 def decode(self, input, final=False):
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300 # decode input (taking the buffer into account)
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301 data = self.buffer + input
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302 (result, consumed) = self._buffer_decode(data, self.errors, final)
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303 # keep undecoded input until the next call
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304 self.buffer = data[consumed:]
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305 return result
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306
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307 def reset(self):
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308 IncrementalDecoder.reset(self)
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309 self.buffer = ""
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310
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311 def getstate(self):
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312 # additional state info is always 0
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313 return (self.buffer, 0)
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314
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315 def setstate(self, state):
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316 # ignore additional state info
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317 self.buffer = state[0]
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318
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319 #
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320 # The StreamWriter and StreamReader class provide generic working
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321 # interfaces which can be used to implement new encoding submodules
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322 # very easily. See encodings/utf_8.py for an example on how this is
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323 # done.
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324 #
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325
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326 class StreamWriter(Codec):
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327
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328 def __init__(self, stream, errors='strict'):
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329
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330 """ Creates a StreamWriter instance.
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331
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332 stream must be a file-like object open for writing
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333 (binary) data.
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334
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335 The StreamWriter may use different error handling
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336 schemes by providing the errors keyword argument. These
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337 parameters are predefined:
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338
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339 'strict' - raise a ValueError (or a subclass)
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340 'ignore' - ignore the character and continue with the next
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341 'replace'- replace with a suitable replacement character
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342 'xmlcharrefreplace' - Replace with the appropriate XML
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343 character reference.
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344 'backslashreplace' - Replace with backslashed escape
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345 sequences (only for encoding).
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346
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347 The set of allowed parameter values can be extended via
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348 register_error.
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349 """
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350 self.stream = stream
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351 self.errors = errors
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352
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353 def write(self, object):
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354
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355 """ Writes the object's contents encoded to self.stream.
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356 """
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357 data, consumed = self.encode(object, self.errors)
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358 self.stream.write(data)
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359
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360 def writelines(self, list):
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361
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362 """ Writes the concatenated list of strings to the stream
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363 using .write().
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364 """
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365 self.write(''.join(list))
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366
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367 def reset(self):
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368
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369 """ Flushes and resets the codec buffers used for keeping state.
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370
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371 Calling this method should ensure that the data on the
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372 output is put into a clean state, that allows appending
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373 of new fresh data without having to rescan the whole
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374 stream to recover state.
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375
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376 """
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377 pass
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378
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379 def seek(self, offset, whence=0):
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380 self.stream.seek(offset, whence)
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381 if whence == 0 and offset == 0:
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382 self.reset()
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383
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384 def __getattr__(self, name,
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385 getattr=getattr):
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386
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387 """ Inherit all other methods from the underlying stream.
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388 """
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389 return getattr(self.stream, name)
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390
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391 def __enter__(self):
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392 return self
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393
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394 def __exit__(self, type, value, tb):
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395 self.stream.close()
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396
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397 ###
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398
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399 class StreamReader(Codec):
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400
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401 def __init__(self, stream, errors='strict'):
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402
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403 """ Creates a StreamReader instance.
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404
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405 stream must be a file-like object open for reading
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406 (binary) data.
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407
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408 The StreamReader may use different error handling
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409 schemes by providing the errors keyword argument. These
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410 parameters are predefined:
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411
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412 'strict' - raise a ValueError (or a subclass)
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413 'ignore' - ignore the character and continue with the next
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414 'replace'- replace with a suitable replacement character;
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415
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416 The set of allowed parameter values can be extended via
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417 register_error.
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418 """
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419 self.stream = stream
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420 self.errors = errors
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421 self.bytebuffer = ""
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422 # For str->str decoding this will stay a str
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423 # For str->unicode decoding the first read will promote it to unicode
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424 self.charbuffer = ""
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425 self.linebuffer = None
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426
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427 def decode(self, input, errors='strict'):
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428 raise NotImplementedError
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429
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430 def read(self, size=-1, chars=-1, firstline=False):
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431
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432 """ Decodes data from the stream self.stream and returns the
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433 resulting object.
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434
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435 chars indicates the number of characters to read from the
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436 stream. read() will never return more than chars
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437 characters, but it might return less, if there are not enough
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438 characters available.
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439
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440 size indicates the approximate maximum number of bytes to
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441 read from the stream for decoding purposes. The decoder
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442 can modify this setting as appropriate. The default value
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443 -1 indicates to read and decode as much as possible. size
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444 is intended to prevent having to decode huge files in one
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445 step.
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446
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447 If firstline is true, and a UnicodeDecodeError happens
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448 after the first line terminator in the input only the first line
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449 will be returned, the rest of the input will be kept until the
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450 next call to read().
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451
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452 The method should use a greedy read strategy meaning that
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453 it should read as much data as is allowed within the
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454 definition of the encoding and the given size, e.g. if
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455 optional encoding endings or state markers are available
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456 on the stream, these should be read too.
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457 """
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458 # If we have lines cached, first merge them back into characters
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459 if self.linebuffer:
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460 self.charbuffer = "".join(self.linebuffer)
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461 self.linebuffer = None
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462
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463 # read until we get the required number of characters (if available)
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464 while True:
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465 # can the request be satisfied from the character buffer?
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466 if chars >= 0:
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467 if len(self.charbuffer) >= chars:
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468 break
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469 elif size >= 0:
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470 if len(self.charbuffer) >= size:
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471 break
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472 # we need more data
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473 if size < 0:
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474 newdata = self.stream.read()
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475 else:
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476 newdata = self.stream.read(size)
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477 # decode bytes (those remaining from the last call included)
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478 data = self.bytebuffer + newdata
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479 try:
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480 newchars, decodedbytes = self.decode(data, self.errors)
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481 except UnicodeDecodeError, exc:
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482 if firstline:
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483 newchars, decodedbytes = self.decode(data[:exc.start], self.errors)
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484 lines = newchars.splitlines(True)
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485 if len(lines)<=1:
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486 raise
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487 else:
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488 raise
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489 # keep undecoded bytes until the next call
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490 self.bytebuffer = data[decodedbytes:]
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491 # put new characters in the character buffer
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492 self.charbuffer += newchars
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493 # there was no data available
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494 if not newdata:
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495 break
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496 if chars < 0:
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497 # Return everything we've got
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498 result = self.charbuffer
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499 self.charbuffer = ""
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500 else:
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501 # Return the first chars characters
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502 result = self.charbuffer[:chars]
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503 self.charbuffer = self.charbuffer[chars:]
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504 return result
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505
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506 def readline(self, size=None, keepends=True):
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507
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508 """ Read one line from the input stream and return the
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509 decoded data.
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510
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511 size, if given, is passed as size argument to the
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512 read() method.
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513
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514 """
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515 # If we have lines cached from an earlier read, return
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516 # them unconditionally
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517 if self.linebuffer:
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518 line = self.linebuffer[0]
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519 del self.linebuffer[0]
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520 if len(self.linebuffer) == 1:
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diff changeset
521 # revert to charbuffer mode; we might need more data
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diff changeset
522 # next time
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523 self.charbuffer = self.linebuffer[0]
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diff changeset
524 self.linebuffer = None
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525 if not keepends:
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diff changeset
526 line = line.splitlines(False)[0]
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diff changeset
527 return line
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parents:
diff changeset
528
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529 readsize = size or 72
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530 line = ""
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diff changeset
531 # If size is given, we call read() only once
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532 while True:
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533 data = self.read(readsize, firstline=True)
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534 if data:
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535 # If we're at a "\r" read one extra character (which might
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536 # be a "\n") to get a proper line ending. If the stream is
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537 # temporarily exhausted we return the wrong line ending.
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538 if data.endswith("\r"):
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539 data += self.read(size=1, chars=1)
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540
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541 line += data
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542 lines = line.splitlines(True)
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543 if lines:
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544 if len(lines) > 1:
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545 # More than one line result; the first line is a full line
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546 # to return
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547 line = lines[0]
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548 del lines[0]
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549 if len(lines) > 1:
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550 # cache the remaining lines
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551 lines[-1] += self.charbuffer
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552 self.linebuffer = lines
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553 self.charbuffer = None
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554 else:
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555 # only one remaining line, put it back into charbuffer
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556 self.charbuffer = lines[0] + self.charbuffer
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557 if not keepends:
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558 line = line.splitlines(False)[0]
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559 break
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560 line0withend = lines[0]
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561 line0withoutend = lines[0].splitlines(False)[0]
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562 if line0withend != line0withoutend: # We really have a line end
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diff changeset
563 # Put the rest back together and keep it until the next call
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parents:
diff changeset
564 self.charbuffer = "".join(lines[1:]) + self.charbuffer
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565 if keepends:
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566 line = line0withend
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567 else:
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568 line = line0withoutend
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parents:
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569 break
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570 # we didn't get anything or this was our only try
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571 if not data or size is not None:
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572 if line and not keepends:
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573 line = line.splitlines(False)[0]
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parents:
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574 break
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575 if readsize<8000:
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576 readsize *= 2
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parents:
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577 return line
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parents:
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578
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579 def readlines(self, sizehint=None, keepends=True):
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580
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parents:
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581 """ Read all lines available on the input stream
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bcclaywell
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582 and return them as list of lines.
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583
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584 Line breaks are implemented using the codec's decoder
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585 method and are included in the list entries.
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586
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587 sizehint, if given, is ignored since there is no efficient
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588 way to finding the true end-of-line.
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589
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parents:
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590 """
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parents:
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591 data = self.read()
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592 return data.splitlines(keepends)
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593
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parents:
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594 def reset(self):
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595
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parents:
diff changeset
596 """ Resets the codec buffers used for keeping state.
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parents:
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597
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diff changeset
598 Note that no stream repositioning should take place.
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599 This method is primarily intended to be able to recover
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parents:
diff changeset
600 from decoding errors.
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parents:
diff changeset
601
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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602 """
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parents:
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603 self.bytebuffer = ""
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parents:
diff changeset
604 self.charbuffer = u""
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parents:
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605 self.linebuffer = None
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parents:
diff changeset
606
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parents:
diff changeset
607 def seek(self, offset, whence=0):
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parents:
diff changeset
608 """ Set the input stream's current position.
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parents:
diff changeset
609
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bcclaywell
parents:
diff changeset
610 Resets the codec buffers used for keeping state.
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parents:
diff changeset
611 """
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parents:
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612 self.stream.seek(offset, whence)
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bcclaywell
parents:
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613 self.reset()
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bcclaywell
parents:
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614
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parents:
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615 def next(self):
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parents:
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616
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617 """ Return the next decoded line from the input stream."""
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618 line = self.readline()
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parents:
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619 if line:
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620 return line
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bcclaywell
parents:
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621 raise StopIteration
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622
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parents:
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623 def __iter__(self):
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parents:
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624 return self
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parents:
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625
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parents:
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626 def __getattr__(self, name,
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627 getattr=getattr):
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628
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parents:
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629 """ Inherit all other methods from the underlying stream.
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630 """
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parents:
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631 return getattr(self.stream, name)
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parents:
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632
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parents:
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633 def __enter__(self):
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parents:
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634 return self
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parents:
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635
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parents:
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636 def __exit__(self, type, value, tb):
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parents:
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637 self.stream.close()
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638
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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639 ###
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parents:
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640
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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641 class StreamReaderWriter:
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642
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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643 """ StreamReaderWriter instances allow wrapping streams which
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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644 work in both read and write modes.
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parents:
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645
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646 The design is such that one can use the factory functions
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
647 returned by the codec.lookup() function to construct the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
648 instance.
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649
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650 """
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651 # Optional attributes set by the file wrappers below
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652 encoding = 'unknown'
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653
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654 def __init__(self, stream, Reader, Writer, errors='strict'):
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655
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656 """ Creates a StreamReaderWriter instance.
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657
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658 stream must be a Stream-like object.
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659
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660 Reader, Writer must be factory functions or classes
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661 providing the StreamReader, StreamWriter interface resp.
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662
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663 Error handling is done in the same way as defined for the
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664 StreamWriter/Readers.
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665
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666 """
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667 self.stream = stream
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668 self.reader = Reader(stream, errors)
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669 self.writer = Writer(stream, errors)
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670 self.errors = errors
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671
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672 def read(self, size=-1):
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673
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674 return self.reader.read(size)
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675
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676 def readline(self, size=None):
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677
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678 return self.reader.readline(size)
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679
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680 def readlines(self, sizehint=None):
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681
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682 return self.reader.readlines(sizehint)
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683
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684 def next(self):
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685
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686 """ Return the next decoded line from the input stream."""
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687 return self.reader.next()
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688
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689 def __iter__(self):
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690 return self
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691
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692 def write(self, data):
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693
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694 return self.writer.write(data)
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695
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696 def writelines(self, list):
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697
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698 return self.writer.writelines(list)
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699
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700 def reset(self):
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701
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702 self.reader.reset()
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703 self.writer.reset()
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704
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705 def seek(self, offset, whence=0):
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706 self.stream.seek(offset, whence)
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707 self.reader.reset()
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708 if whence == 0 and offset == 0:
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709 self.writer.reset()
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710
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711 def __getattr__(self, name,
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712 getattr=getattr):
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713
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714 """ Inherit all other methods from the underlying stream.
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715 """
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716 return getattr(self.stream, name)
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717
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718 # these are needed to make "with codecs.open(...)" work properly
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719
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720 def __enter__(self):
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721 return self
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722
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723 def __exit__(self, type, value, tb):
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724 self.stream.close()
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725
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726 ###
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727
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728 class StreamRecoder:
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729
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730 """ StreamRecoder instances provide a frontend - backend
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731 view of encoding data.
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732
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733 They use the complete set of APIs returned by the
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734 codecs.lookup() function to implement their task.
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735
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736 Data written to the stream is first decoded into an
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737 intermediate format (which is dependent on the given codec
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738 combination) and then written to the stream using an instance
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739 of the provided Writer class.
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740
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741 In the other direction, data is read from the stream using a
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742 Reader instance and then return encoded data to the caller.
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743
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744 """
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745 # Optional attributes set by the file wrappers below
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746 data_encoding = 'unknown'
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747 file_encoding = 'unknown'
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748
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749 def __init__(self, stream, encode, decode, Reader, Writer,
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750 errors='strict'):
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751
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752 """ Creates a StreamRecoder instance which implements a two-way
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753 conversion: encode and decode work on the frontend (the
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754 input to .read() and output of .write()) while
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755 Reader and Writer work on the backend (reading and
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756 writing to the stream).
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757
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758 You can use these objects to do transparent direct
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759 recodings from e.g. latin-1 to utf-8 and back.
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760
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761 stream must be a file-like object.
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762
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763 encode, decode must adhere to the Codec interface, Reader,
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764 Writer must be factory functions or classes providing the
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765 StreamReader, StreamWriter interface resp.
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766
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767 encode and decode are needed for the frontend translation,
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768 Reader and Writer for the backend translation. Unicode is
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769 used as intermediate encoding.
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770
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771 Error handling is done in the same way as defined for the
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772 StreamWriter/Readers.
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773
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774 """
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775 self.stream = stream
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776 self.encode = encode
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777 self.decode = decode
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778 self.reader = Reader(stream, errors)
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779 self.writer = Writer(stream, errors)
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780 self.errors = errors
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781
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782 def read(self, size=-1):
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783
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parents:
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784 data = self.reader.read(size)
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bcclaywell
parents:
diff changeset
785 data, bytesencoded = self.encode(data, self.errors)
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bcclaywell
parents:
diff changeset
786 return data
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787
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788 def readline(self, size=None):
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789
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790 if size is None:
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bcclaywell
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791 data = self.reader.readline()
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792 else:
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793 data = self.reader.readline(size)
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parents:
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794 data, bytesencoded = self.encode(data, self.errors)
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795 return data
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796
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797 def readlines(self, sizehint=None):
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798
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799 data = self.reader.read()
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parents:
diff changeset
800 data, bytesencoded = self.encode(data, self.errors)
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bcclaywell
parents:
diff changeset
801 return data.splitlines(1)
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802
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803 def next(self):
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804
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parents:
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805 """ Return the next decoded line from the input stream."""
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806 data = self.reader.next()
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bcclaywell
parents:
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807 data, bytesencoded = self.encode(data, self.errors)
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bcclaywell
parents:
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808 return data
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809
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bcclaywell
parents:
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810 def __iter__(self):
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bcclaywell
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811 return self
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812
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813 def write(self, data):
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bcclaywell
parents:
diff changeset
814
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bcclaywell
parents:
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815 data, bytesdecoded = self.decode(data, self.errors)
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bcclaywell
parents:
diff changeset
816 return self.writer.write(data)
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817
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parents:
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818 def writelines(self, list):
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bcclaywell
parents:
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819
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parents:
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820 data = ''.join(list)
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bcclaywell
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821 data, bytesdecoded = self.decode(data, self.errors)
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bcclaywell
parents:
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822 return self.writer.write(data)
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bcclaywell
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823
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824 def reset(self):
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825
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826 self.reader.reset()
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parents:
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827 self.writer.reset()
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bcclaywell
parents:
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828
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bcclaywell
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829 def __getattr__(self, name,
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bcclaywell
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830 getattr=getattr):
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831
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bcclaywell
parents:
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832 """ Inherit all other methods from the underlying stream.
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bcclaywell
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833 """
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bcclaywell
parents:
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834 return getattr(self.stream, name)
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835
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bcclaywell
parents:
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836 def __enter__(self):
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bcclaywell
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837 return self
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bcclaywell
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838
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bcclaywell
parents:
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839 def __exit__(self, type, value, tb):
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bcclaywell
parents:
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840 self.stream.close()
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bcclaywell
parents:
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841
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bcclaywell
parents:
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842 ### Shortcuts
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bcclaywell
parents:
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843
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bcclaywell
parents:
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844 def open(filename, mode='rb', encoding=None, errors='strict', buffering=1):
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845
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bcclaywell
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846 """ Open an encoded file using the given mode and return
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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847 a wrapped version providing transparent encoding/decoding.
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bcclaywell
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diff changeset
848
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bcclaywell
parents:
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849 Note: The wrapped version will only accept the object format
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bcclaywell
parents:
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850 defined by the codecs, i.e. Unicode objects for most builtin
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
851 codecs. Output is also codec dependent and will usually be
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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852 Unicode as well.
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bcclaywell
parents:
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853
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bcclaywell
parents:
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854 Files are always opened in binary mode, even if no binary mode
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bcclaywell
parents:
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855 was specified. This is done to avoid data loss due to encodings
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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856 using 8-bit values. The default file mode is 'rb' meaning to
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
857 open the file in binary read mode.
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bcclaywell
parents:
diff changeset
858
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
859 encoding specifies the encoding which is to be used for the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
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860 file.
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bcclaywell
parents:
diff changeset
861
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
862 errors may be given to define the error handling. It defaults
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
863 to 'strict' which causes ValueErrors to be raised in case an
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bcclaywell
parents:
diff changeset
864 encoding error occurs.
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bcclaywell
parents:
diff changeset
865
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bcclaywell
parents:
diff changeset
866 buffering has the same meaning as for the builtin open() API.
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bcclaywell
parents:
diff changeset
867 It defaults to line buffered.
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bcclaywell
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868
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bcclaywell
parents:
diff changeset
869 The returned wrapped file object provides an extra attribute
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bcclaywell
parents:
diff changeset
870 .encoding which allows querying the used encoding. This
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
871 attribute is only available if an encoding was specified as
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
872 parameter.
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bcclaywell
parents:
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873
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bcclaywell
parents:
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874 """
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bcclaywell
parents:
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875 if encoding is not None:
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bcclaywell
parents:
diff changeset
876 if 'U' in mode:
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bcclaywell
parents:
diff changeset
877 # No automatic conversion of '\n' is done on reading and writing
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bcclaywell
parents:
diff changeset
878 mode = mode.strip().replace('U', '')
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bcclaywell
parents:
diff changeset
879 if mode[:1] not in set('rwa'):
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bcclaywell
parents:
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880 mode = 'r' + mode
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bcclaywell
parents:
diff changeset
881 if 'b' not in mode:
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bcclaywell
parents:
diff changeset
882 # Force opening of the file in binary mode
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bcclaywell
parents:
diff changeset
883 mode = mode + 'b'
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bcclaywell
parents:
diff changeset
884 file = __builtin__.open(filename, mode, buffering)
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bcclaywell
parents:
diff changeset
885 if encoding is None:
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bcclaywell
parents:
diff changeset
886 return file
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bcclaywell
parents:
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887 info = lookup(encoding)
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bcclaywell
parents:
diff changeset
888 srw = StreamReaderWriter(file, info.streamreader, info.streamwriter, errors)
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bcclaywell
parents:
diff changeset
889 # Add attributes to simplify introspection
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bcclaywell
parents:
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890 srw.encoding = encoding
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bcclaywell
parents:
diff changeset
891 return srw
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bcclaywell
parents:
diff changeset
892
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parents:
diff changeset
893 def EncodedFile(file, data_encoding, file_encoding=None, errors='strict'):
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bcclaywell
parents:
diff changeset
894
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bcclaywell
parents:
diff changeset
895 """ Return a wrapped version of file which provides transparent
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
896 encoding translation.
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bcclaywell
parents:
diff changeset
897
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bcclaywell
parents:
diff changeset
898 Strings written to the wrapped file are interpreted according
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
899 to the given data_encoding and then written to the original
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
900 file as string using file_encoding. The intermediate encoding
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
901 will usually be Unicode but depends on the specified codecs.
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bcclaywell
parents:
diff changeset
902
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
903 Strings are read from the file using file_encoding and then
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
904 passed back to the caller as string using data_encoding.
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parents:
diff changeset
905
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parents:
diff changeset
906 If file_encoding is not given, it defaults to data_encoding.
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bcclaywell
parents:
diff changeset
907
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bcclaywell
parents:
diff changeset
908 errors may be given to define the error handling. It defaults
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bcclaywell
parents:
diff changeset
909 to 'strict' which causes ValueErrors to be raised in case an
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bcclaywell
parents:
diff changeset
910 encoding error occurs.
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diff changeset
911
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diff changeset
912 The returned wrapped file object provides two extra attributes
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diff changeset
913 .data_encoding and .file_encoding which reflect the given
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diff changeset
914 parameters of the same name. The attributes can be used for
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diff changeset
915 introspection by Python programs.
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diff changeset
916
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917 """
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918 if file_encoding is None:
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diff changeset
919 file_encoding = data_encoding
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diff changeset
920 data_info = lookup(data_encoding)
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diff changeset
921 file_info = lookup(file_encoding)
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diff changeset
922 sr = StreamRecoder(file, data_info.encode, data_info.decode,
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923 file_info.streamreader, file_info.streamwriter, errors)
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diff changeset
924 # Add attributes to simplify introspection
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diff changeset
925 sr.data_encoding = data_encoding
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926 sr.file_encoding = file_encoding
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diff changeset
927 return sr
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diff changeset
928
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929 ### Helpers for codec lookup
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diff changeset
930
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931 def getencoder(encoding):
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932
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933 """ Lookup up the codec for the given encoding and return
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934 its encoder function.
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935
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936 Raises a LookupError in case the encoding cannot be found.
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937
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938 """
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939 return lookup(encoding).encode
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940
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941 def getdecoder(encoding):
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942
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943 """ Lookup up the codec for the given encoding and return
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944 its decoder function.
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diff changeset
945
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946 Raises a LookupError in case the encoding cannot be found.
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947
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948 """
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949 return lookup(encoding).decode
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950
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951 def getincrementalencoder(encoding):
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952
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953 """ Lookup up the codec for the given encoding and return
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954 its IncrementalEncoder class or factory function.
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955
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956 Raises a LookupError in case the encoding cannot be found
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957 or the codecs doesn't provide an incremental encoder.
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958
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959 """
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960 encoder = lookup(encoding).incrementalencoder
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961 if encoder is None:
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962 raise LookupError(encoding)
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963 return encoder
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964
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965 def getincrementaldecoder(encoding):
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966
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967 """ Lookup up the codec for the given encoding and return
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968 its IncrementalDecoder class or factory function.
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969
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970 Raises a LookupError in case the encoding cannot be found
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971 or the codecs doesn't provide an incremental decoder.
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972
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973 """
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974 decoder = lookup(encoding).incrementaldecoder
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975 if decoder is None:
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976 raise LookupError(encoding)
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977 return decoder
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978
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979 def getreader(encoding):
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980
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981 """ Lookup up the codec for the given encoding and return
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diff changeset
982 its StreamReader class or factory function.
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983
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984 Raises a LookupError in case the encoding cannot be found.
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985
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986 """
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987 return lookup(encoding).streamreader
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988
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989 def getwriter(encoding):
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990
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991 """ Lookup up the codec for the given encoding and return
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992 its StreamWriter class or factory function.
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993
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994 Raises a LookupError in case the encoding cannot be found.
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diff changeset
995
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996 """
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997 return lookup(encoding).streamwriter
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998
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999 def iterencode(iterator, encoding, errors='strict', **kwargs):
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1000 """
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1001 Encoding iterator.
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1002
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1003 Encodes the input strings from the iterator using a IncrementalEncoder.
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diff changeset
1004
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diff changeset
1005 errors and kwargs are passed through to the IncrementalEncoder
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1006 constructor.
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1007 """
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1008 encoder = getincrementalencoder(encoding)(errors, **kwargs)
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1009 for input in iterator:
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1010 output = encoder.encode(input)
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1011 if output:
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1012 yield output
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1013 output = encoder.encode("", True)
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1014 if output:
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1015 yield output
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1016
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1017 def iterdecode(iterator, encoding, errors='strict', **kwargs):
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1018 """
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1019 Decoding iterator.
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1020
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1021 Decodes the input strings from the iterator using a IncrementalDecoder.
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1022
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1023 errors and kwargs are passed through to the IncrementalDecoder
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1024 constructor.
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1025 """
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1026 decoder = getincrementaldecoder(encoding)(errors, **kwargs)
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1027 for input in iterator:
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1028 output = decoder.decode(input)
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1029 if output:
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1030 yield output
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1031 output = decoder.decode("", True)
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1032 if output:
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1033 yield output
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1034
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1035 ### Helpers for charmap-based codecs
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1036
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1037 def make_identity_dict(rng):
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1038
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1039 """ make_identity_dict(rng) -> dict
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1040
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1041 Return a dictionary where elements of the rng sequence are
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1042 mapped to themselves.
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1043
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1044 """
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1045 res = {}
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1046 for i in rng:
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1047 res[i]=i
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1048 return res
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1049
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1050 def make_encoding_map(decoding_map):
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1051
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1052 """ Creates an encoding map from a decoding map.
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1053
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1054 If a target mapping in the decoding map occurs multiple
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1055 times, then that target is mapped to None (undefined mapping),
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1056 causing an exception when encountered by the charmap codec
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1057 during translation.
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1058
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1059 One example where this happens is cp875.py which decodes
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1060 multiple character to \\u001a.
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1061
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1062 """
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1063 m = {}
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1064 for k,v in decoding_map.items():
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1065 if not v in m:
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1066 m[v] = k
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1067 else:
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1068 m[v] = None
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1069 return m
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1070
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1071 ### error handlers
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1072
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1073 try:
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1074 strict_errors = lookup_error("strict")
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1075 ignore_errors = lookup_error("ignore")
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1076 replace_errors = lookup_error("replace")
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1077 xmlcharrefreplace_errors = lookup_error("xmlcharrefreplace")
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1078 backslashreplace_errors = lookup_error("backslashreplace")
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1079 except LookupError:
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1080 # In --disable-unicode builds, these error handler are missing
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1081 strict_errors = None
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1082 ignore_errors = None
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1083 replace_errors = None
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1084 xmlcharrefreplace_errors = None
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1085 backslashreplace_errors = None
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1086
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1087 # Tell modulefinder that using codecs probably needs the encodings
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1088 # package
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1089 _false = 0
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1090 if _false:
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1091 import encodings
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1092
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1093 ### Tests
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1094
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1095 if __name__ == '__main__':
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1096
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1097 # Make stdout translate Latin-1 output into UTF-8 output
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1098 sys.stdout = EncodedFile(sys.stdout, 'latin-1', 'utf-8')
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1099
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1100 # Have stdin translate Latin-1 input into UTF-8 input
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1101 sys.stdin = EncodedFile(sys.stdin, 'utf-8', 'latin-1')