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annotate venv/lib/python2.7/site-packages/requests/packages/chardet/chardistribution.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 ######################## BEGIN LICENSE BLOCK ########################
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2 # The Original Code is Mozilla Communicator client 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) 1998
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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 #
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12 # This library is free software; you can redistribute it and/or
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13 # modify it under the terms of the GNU Lesser General Public
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14 # License as published by the Free Software Foundation; either
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15 # version 2.1 of the License, or (at your option) any later version.
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16 #
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17 # This library is distributed in the hope that it will be useful,
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18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 # Lesser General Public License for more details.
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21 #
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22 # You should have received a copy of the GNU Lesser General Public
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23 # License along with this library; if not, write to the Free Software
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24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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25 # 02110-1301 USA
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26 ######################### END LICENSE BLOCK #########################
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27
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28 from .euctwfreq import (EUCTWCharToFreqOrder, EUCTW_TABLE_SIZE,
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29 EUCTW_TYPICAL_DISTRIBUTION_RATIO)
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30 from .euckrfreq import (EUCKRCharToFreqOrder, EUCKR_TABLE_SIZE,
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31 EUCKR_TYPICAL_DISTRIBUTION_RATIO)
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32 from .gb2312freq import (GB2312CharToFreqOrder, GB2312_TABLE_SIZE,
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33 GB2312_TYPICAL_DISTRIBUTION_RATIO)
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34 from .big5freq import (Big5CharToFreqOrder, BIG5_TABLE_SIZE,
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35 BIG5_TYPICAL_DISTRIBUTION_RATIO)
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36 from .jisfreq import (JISCharToFreqOrder, JIS_TABLE_SIZE,
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37 JIS_TYPICAL_DISTRIBUTION_RATIO)
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38 from .compat import wrap_ord
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39
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40 ENOUGH_DATA_THRESHOLD = 1024
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41 SURE_YES = 0.99
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42 SURE_NO = 0.01
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43 MINIMUM_DATA_THRESHOLD = 3
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44
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45
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46 class CharDistributionAnalysis:
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47 def __init__(self):
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48 # Mapping table to get frequency order from char order (get from
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49 # GetOrder())
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50 self._mCharToFreqOrder = None
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51 self._mTableSize = None # Size of above table
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52 # This is a constant value which varies from language to language,
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53 # used in calculating confidence. See
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54 # http://www.mozilla.org/projects/intl/UniversalCharsetDetection.html
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55 # for further detail.
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56 self._mTypicalDistributionRatio = None
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57 self.reset()
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58
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59 def reset(self):
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60 """reset analyser, clear any state"""
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61 # If this flag is set to True, detection is done and conclusion has
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62 # been made
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63 self._mDone = False
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64 self._mTotalChars = 0 # Total characters encountered
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65 # The number of characters whose frequency order is less than 512
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66 self._mFreqChars = 0
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67
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68 def feed(self, aBuf, aCharLen):
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69 """feed a character with known length"""
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70 if aCharLen == 2:
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71 # we only care about 2-bytes character in our distribution analysis
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72 order = self.get_order(aBuf)
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73 else:
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74 order = -1
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75 if order >= 0:
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76 self._mTotalChars += 1
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77 # order is valid
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78 if order < self._mTableSize:
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79 if 512 > self._mCharToFreqOrder[order]:
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80 self._mFreqChars += 1
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81
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82 def get_confidence(self):
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83 """return confidence based on existing data"""
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84 # if we didn't receive any character in our consideration range,
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85 # return negative answer
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86 if self._mTotalChars <= 0 or self._mFreqChars <= MINIMUM_DATA_THRESHOLD:
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87 return SURE_NO
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88
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89 if self._mTotalChars != self._mFreqChars:
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90 r = (self._mFreqChars / ((self._mTotalChars - self._mFreqChars)
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91 * self._mTypicalDistributionRatio))
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92 if r < SURE_YES:
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93 return r
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94
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95 # normalize confidence (we don't want to be 100% sure)
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96 return SURE_YES
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97
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98 def got_enough_data(self):
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99 # It is not necessary to receive all data to draw conclusion.
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100 # For charset detection, certain amount of data is enough
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101 return self._mTotalChars > ENOUGH_DATA_THRESHOLD
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102
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103 def get_order(self, aBuf):
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104 # We do not handle characters based on the original encoding string,
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105 # but convert this encoding string to a number, here called order.
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106 # This allows multiple encodings of a language to share one frequency
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107 # table.
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108 return -1
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109
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110
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111 class EUCTWDistributionAnalysis(CharDistributionAnalysis):
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112 def __init__(self):
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113 CharDistributionAnalysis.__init__(self)
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114 self._mCharToFreqOrder = EUCTWCharToFreqOrder
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115 self._mTableSize = EUCTW_TABLE_SIZE
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116 self._mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO
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117
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118 def get_order(self, aBuf):
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119 # for euc-TW encoding, we are interested
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120 # first byte range: 0xc4 -- 0xfe
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121 # second byte range: 0xa1 -- 0xfe
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122 # no validation needed here. State machine has done that
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123 first_char = wrap_ord(aBuf[0])
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124 if first_char >= 0xC4:
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125 return 94 * (first_char - 0xC4) + wrap_ord(aBuf[1]) - 0xA1
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126 else:
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127 return -1
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128
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129
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130 class EUCKRDistributionAnalysis(CharDistributionAnalysis):
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131 def __init__(self):
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132 CharDistributionAnalysis.__init__(self)
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133 self._mCharToFreqOrder = EUCKRCharToFreqOrder
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134 self._mTableSize = EUCKR_TABLE_SIZE
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135 self._mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO
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136
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137 def get_order(self, aBuf):
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138 # for euc-KR encoding, we are interested
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139 # first byte range: 0xb0 -- 0xfe
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140 # second byte range: 0xa1 -- 0xfe
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141 # no validation needed here. State machine has done that
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142 first_char = wrap_ord(aBuf[0])
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143 if first_char >= 0xB0:
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144 return 94 * (first_char - 0xB0) + wrap_ord(aBuf[1]) - 0xA1
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145 else:
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146 return -1
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147
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148
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149 class GB2312DistributionAnalysis(CharDistributionAnalysis):
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150 def __init__(self):
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151 CharDistributionAnalysis.__init__(self)
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152 self._mCharToFreqOrder = GB2312CharToFreqOrder
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153 self._mTableSize = GB2312_TABLE_SIZE
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154 self._mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO
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155
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156 def get_order(self, aBuf):
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157 # for GB2312 encoding, we are interested
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158 # first byte range: 0xb0 -- 0xfe
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159 # second byte range: 0xa1 -- 0xfe
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160 # no validation needed here. State machine has done that
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161 first_char, second_char = wrap_ord(aBuf[0]), wrap_ord(aBuf[1])
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162 if (first_char >= 0xB0) and (second_char >= 0xA1):
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163 return 94 * (first_char - 0xB0) + second_char - 0xA1
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164 else:
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165 return -1
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166
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167
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168 class Big5DistributionAnalysis(CharDistributionAnalysis):
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169 def __init__(self):
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170 CharDistributionAnalysis.__init__(self)
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171 self._mCharToFreqOrder = Big5CharToFreqOrder
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172 self._mTableSize = BIG5_TABLE_SIZE
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173 self._mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO
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174
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175 def get_order(self, aBuf):
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176 # for big5 encoding, we are interested
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177 # first byte range: 0xa4 -- 0xfe
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178 # second byte range: 0x40 -- 0x7e , 0xa1 -- 0xfe
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179 # no validation needed here. State machine has done that
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180 first_char, second_char = wrap_ord(aBuf[0]), wrap_ord(aBuf[1])
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181 if first_char >= 0xA4:
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182 if second_char >= 0xA1:
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183 return 157 * (first_char - 0xA4) + second_char - 0xA1 + 63
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184 else:
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185 return 157 * (first_char - 0xA4) + second_char - 0x40
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186 else:
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187 return -1
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188
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189
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190 class SJISDistributionAnalysis(CharDistributionAnalysis):
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191 def __init__(self):
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192 CharDistributionAnalysis.__init__(self)
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193 self._mCharToFreqOrder = JISCharToFreqOrder
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194 self._mTableSize = JIS_TABLE_SIZE
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195 self._mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO
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196
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197 def get_order(self, aBuf):
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198 # for sjis encoding, we are interested
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199 # first byte range: 0x81 -- 0x9f , 0xe0 -- 0xfe
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200 # second byte range: 0x40 -- 0x7e, 0x81 -- oxfe
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201 # no validation needed here. State machine has done that
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202 first_char, second_char = wrap_ord(aBuf[0]), wrap_ord(aBuf[1])
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203 if (first_char >= 0x81) and (first_char <= 0x9F):
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204 order = 188 * (first_char - 0x81)
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205 elif (first_char >= 0xE0) and (first_char <= 0xEF):
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206 order = 188 * (first_char - 0xE0 + 31)
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207 else:
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208 return -1
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209 order = order + second_char - 0x40
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210 if second_char > 0x7F:
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211 order = -1
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212 return order
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213
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214
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215 class EUCJPDistributionAnalysis(CharDistributionAnalysis):
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216 def __init__(self):
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217 CharDistributionAnalysis.__init__(self)
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218 self._mCharToFreqOrder = JISCharToFreqOrder
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219 self._mTableSize = JIS_TABLE_SIZE
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220 self._mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO
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221
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222 def get_order(self, aBuf):
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223 # for euc-JP encoding, we are interested
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224 # first byte range: 0xa0 -- 0xfe
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225 # second byte range: 0xa1 -- 0xfe
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226 # no validation needed here. State machine has done that
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227 char = wrap_ord(aBuf[0])
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228 if char >= 0xA0:
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229 return 94 * (char - 0xA1) + wrap_ord(aBuf[1]) - 0xa1
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230 else:
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231 return -1