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annotate planemo/lib/python3.7/site-packages/chardet/universaldetector.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 ######################## BEGIN LICENSE BLOCK ########################
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2 # The Original Code is Mozilla Universal charset detector code.
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3 #
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4 # The Initial Developer of the Original Code is
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5 # Netscape Communications Corporation.
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6 # Portions created by the Initial Developer are Copyright (C) 2001
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7 # the Initial Developer. All Rights Reserved.
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8 #
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9 # Contributor(s):
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10 # Mark Pilgrim - port to Python
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11 # Shy Shalom - original C code
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12 #
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13 # This library is free software; you can redistribute it and/or
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14 # modify it under the terms of the GNU Lesser General Public
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15 # License as published by the Free Software Foundation; either
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16 # version 2.1 of the License, or (at your option) any later version.
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17 #
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18 # This library is distributed in the hope that it will be useful,
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19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 # Lesser General Public License for more details.
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22 #
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23 # You should have received a copy of the GNU Lesser General Public
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24 # License along with this library; if not, write to the Free Software
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25 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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26 # 02110-1301 USA
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27 ######################### END LICENSE BLOCK #########################
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28 """
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29 Module containing the UniversalDetector detector class, which is the primary
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30 class a user of ``chardet`` should use.
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31
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32 :author: Mark Pilgrim (initial port to Python)
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33 :author: Shy Shalom (original C code)
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34 :author: Dan Blanchard (major refactoring for 3.0)
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35 :author: Ian Cordasco
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36 """
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37
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38
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39 import codecs
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40 import logging
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41 import re
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42
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43 from .charsetgroupprober import CharSetGroupProber
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44 from .enums import InputState, LanguageFilter, ProbingState
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45 from .escprober import EscCharSetProber
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46 from .latin1prober import Latin1Prober
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47 from .mbcsgroupprober import MBCSGroupProber
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48 from .sbcsgroupprober import SBCSGroupProber
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49
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50
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51 class UniversalDetector(object):
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52 """
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53 The ``UniversalDetector`` class underlies the ``chardet.detect`` function
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54 and coordinates all of the different charset probers.
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55
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56 To get a ``dict`` containing an encoding and its confidence, you can simply
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57 run:
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58
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59 .. code::
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60
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61 u = UniversalDetector()
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62 u.feed(some_bytes)
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63 u.close()
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64 detected = u.result
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65
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66 """
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67
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68 MINIMUM_THRESHOLD = 0.20
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69 HIGH_BYTE_DETECTOR = re.compile(b'[\x80-\xFF]')
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70 ESC_DETECTOR = re.compile(b'(\033|~{)')
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71 WIN_BYTE_DETECTOR = re.compile(b'[\x80-\x9F]')
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72 ISO_WIN_MAP = {'iso-8859-1': 'Windows-1252',
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73 'iso-8859-2': 'Windows-1250',
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74 'iso-8859-5': 'Windows-1251',
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75 'iso-8859-6': 'Windows-1256',
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76 'iso-8859-7': 'Windows-1253',
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77 'iso-8859-8': 'Windows-1255',
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78 'iso-8859-9': 'Windows-1254',
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79 'iso-8859-13': 'Windows-1257'}
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80
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81 def __init__(self, lang_filter=LanguageFilter.ALL):
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82 self._esc_charset_prober = None
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83 self._charset_probers = []
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84 self.result = None
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85 self.done = None
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86 self._got_data = None
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87 self._input_state = None
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88 self._last_char = None
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89 self.lang_filter = lang_filter
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90 self.logger = logging.getLogger(__name__)
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91 self._has_win_bytes = None
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92 self.reset()
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93
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94 def reset(self):
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95 """
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96 Reset the UniversalDetector and all of its probers back to their
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97 initial states. This is called by ``__init__``, so you only need to
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98 call this directly in between analyses of different documents.
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99 """
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100 self.result = {'encoding': None, 'confidence': 0.0, 'language': None}
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101 self.done = False
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102 self._got_data = False
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103 self._has_win_bytes = False
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104 self._input_state = InputState.PURE_ASCII
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105 self._last_char = b''
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106 if self._esc_charset_prober:
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107 self._esc_charset_prober.reset()
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108 for prober in self._charset_probers:
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109 prober.reset()
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110
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111 def feed(self, byte_str):
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112 """
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113 Takes a chunk of a document and feeds it through all of the relevant
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114 charset probers.
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115
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116 After calling ``feed``, you can check the value of the ``done``
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117 attribute to see if you need to continue feeding the
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118 ``UniversalDetector`` more data, or if it has made a prediction
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119 (in the ``result`` attribute).
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120
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121 .. note::
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122 You should always call ``close`` when you're done feeding in your
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123 document if ``done`` is not already ``True``.
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124 """
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125 if self.done:
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126 return
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127
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128 if not len(byte_str):
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129 return
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parents:
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130
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131 if not isinstance(byte_str, bytearray):
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132 byte_str = bytearray(byte_str)
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133
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134 # First check for known BOMs, since these are guaranteed to be correct
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135 if not self._got_data:
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136 # If the data starts with BOM, we know it is UTF
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137 if byte_str.startswith(codecs.BOM_UTF8):
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parents:
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138 # EF BB BF UTF-8 with BOM
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139 self.result = {'encoding': "UTF-8-SIG",
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140 'confidence': 1.0,
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141 'language': ''}
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142 elif byte_str.startswith((codecs.BOM_UTF32_LE,
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143 codecs.BOM_UTF32_BE)):
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144 # FF FE 00 00 UTF-32, little-endian BOM
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145 # 00 00 FE FF UTF-32, big-endian BOM
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146 self.result = {'encoding': "UTF-32",
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147 'confidence': 1.0,
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148 'language': ''}
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149 elif byte_str.startswith(b'\xFE\xFF\x00\x00'):
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150 # FE FF 00 00 UCS-4, unusual octet order BOM (3412)
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151 self.result = {'encoding': "X-ISO-10646-UCS-4-3412",
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152 'confidence': 1.0,
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153 'language': ''}
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154 elif byte_str.startswith(b'\x00\x00\xFF\xFE'):
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155 # 00 00 FF FE UCS-4, unusual octet order BOM (2143)
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156 self.result = {'encoding': "X-ISO-10646-UCS-4-2143",
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157 'confidence': 1.0,
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158 'language': ''}
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159 elif byte_str.startswith((codecs.BOM_LE, codecs.BOM_BE)):
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160 # FF FE UTF-16, little endian BOM
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161 # FE FF UTF-16, big endian BOM
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162 self.result = {'encoding': "UTF-16",
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163 'confidence': 1.0,
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164 'language': ''}
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165
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166 self._got_data = True
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167 if self.result['encoding'] is not None:
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168 self.done = True
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169 return
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170
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171 # If none of those matched and we've only see ASCII so far, check
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172 # for high bytes and escape sequences
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173 if self._input_state == InputState.PURE_ASCII:
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174 if self.HIGH_BYTE_DETECTOR.search(byte_str):
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175 self._input_state = InputState.HIGH_BYTE
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176 elif self._input_state == InputState.PURE_ASCII and \
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177 self.ESC_DETECTOR.search(self._last_char + byte_str):
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178 self._input_state = InputState.ESC_ASCII
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179
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180 self._last_char = byte_str[-1:]
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181
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182 # If we've seen escape sequences, use the EscCharSetProber, which
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183 # uses a simple state machine to check for known escape sequences in
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184 # HZ and ISO-2022 encodings, since those are the only encodings that
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185 # use such sequences.
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186 if self._input_state == InputState.ESC_ASCII:
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187 if not self._esc_charset_prober:
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188 self._esc_charset_prober = EscCharSetProber(self.lang_filter)
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189 if self._esc_charset_prober.feed(byte_str) == ProbingState.FOUND_IT:
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190 self.result = {'encoding':
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191 self._esc_charset_prober.charset_name,
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192 'confidence':
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193 self._esc_charset_prober.get_confidence(),
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194 'language':
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195 self._esc_charset_prober.language}
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196 self.done = True
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197 # If we've seen high bytes (i.e., those with values greater than 127),
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198 # we need to do more complicated checks using all our multi-byte and
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199 # single-byte probers that are left. The single-byte probers
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200 # use character bigram distributions to determine the encoding, whereas
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201 # the multi-byte probers use a combination of character unigram and
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202 # bigram distributions.
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203 elif self._input_state == InputState.HIGH_BYTE:
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204 if not self._charset_probers:
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205 self._charset_probers = [MBCSGroupProber(self.lang_filter)]
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206 # If we're checking non-CJK encodings, use single-byte prober
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207 if self.lang_filter & LanguageFilter.NON_CJK:
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208 self._charset_probers.append(SBCSGroupProber())
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209 self._charset_probers.append(Latin1Prober())
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210 for prober in self._charset_probers:
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211 if prober.feed(byte_str) == ProbingState.FOUND_IT:
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212 self.result = {'encoding': prober.charset_name,
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213 'confidence': prober.get_confidence(),
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214 'language': prober.language}
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215 self.done = True
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216 break
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217 if self.WIN_BYTE_DETECTOR.search(byte_str):
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218 self._has_win_bytes = True
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219
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220 def close(self):
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221 """
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222 Stop analyzing the current document and come up with a final
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223 prediction.
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224
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225 :returns: The ``result`` attribute, a ``dict`` with the keys
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226 `encoding`, `confidence`, and `language`.
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227 """
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228 # Don't bother with checks if we're already done
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229 if self.done:
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230 return self.result
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231 self.done = True
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232
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233 if not self._got_data:
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234 self.logger.debug('no data received!')
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235
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236 # Default to ASCII if it is all we've seen so far
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237 elif self._input_state == InputState.PURE_ASCII:
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238 self.result = {'encoding': 'ascii',
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239 'confidence': 1.0,
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240 'language': ''}
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241
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242 # If we have seen non-ASCII, return the best that met MINIMUM_THRESHOLD
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243 elif self._input_state == InputState.HIGH_BYTE:
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244 prober_confidence = None
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245 max_prober_confidence = 0.0
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246 max_prober = None
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247 for prober in self._charset_probers:
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248 if not prober:
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249 continue
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250 prober_confidence = prober.get_confidence()
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251 if prober_confidence > max_prober_confidence:
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252 max_prober_confidence = prober_confidence
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253 max_prober = prober
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254 if max_prober and (max_prober_confidence > self.MINIMUM_THRESHOLD):
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255 charset_name = max_prober.charset_name
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256 lower_charset_name = max_prober.charset_name.lower()
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257 confidence = max_prober.get_confidence()
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258 # Use Windows encoding name instead of ISO-8859 if we saw any
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259 # extra Windows-specific bytes
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260 if lower_charset_name.startswith('iso-8859'):
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261 if self._has_win_bytes:
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262 charset_name = self.ISO_WIN_MAP.get(lower_charset_name,
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263 charset_name)
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264 self.result = {'encoding': charset_name,
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265 'confidence': confidence,
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266 'language': max_prober.language}
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267
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268 # Log all prober confidences if none met MINIMUM_THRESHOLD
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269 if self.logger.getEffectiveLevel() == logging.DEBUG:
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270 if self.result['encoding'] is None:
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271 self.logger.debug('no probers hit minimum threshold')
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272 for group_prober in self._charset_probers:
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273 if not group_prober:
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274 continue
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275 if isinstance(group_prober, CharSetGroupProber):
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276 for prober in group_prober.probers:
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277 self.logger.debug('%s %s confidence = %s',
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278 prober.charset_name,
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279 prober.language,
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280 prober.get_confidence())
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281 else:
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282 self.logger.debug('%s %s confidence = %s',
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283 prober.charset_name,
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284 prober.language,
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285 prober.get_confidence())
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286 return self.result