Mercurial > repos > shellac > guppy_basecaller
annotate env/lib/python3.7/site-packages/chardet/hebrewprober.py @ 0:26e78fe6e8c4 draft
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author | shellac |
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date | Sat, 02 May 2020 07:14:21 -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 # Shy Shalom |
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6 # Portions created by the Initial Developer are Copyright (C) 2005 |
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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 .charsetprober import CharSetProber |
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29 from .enums import ProbingState |
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30 |
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31 # This prober doesn't actually recognize a language or a charset. |
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32 # It is a helper prober for the use of the Hebrew model probers |
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33 |
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34 ### General ideas of the Hebrew charset recognition ### |
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35 # |
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36 # Four main charsets exist in Hebrew: |
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37 # "ISO-8859-8" - Visual Hebrew |
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38 # "windows-1255" - Logical Hebrew |
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39 # "ISO-8859-8-I" - Logical Hebrew |
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40 # "x-mac-hebrew" - ?? Logical Hebrew ?? |
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41 # |
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42 # Both "ISO" charsets use a completely identical set of code points, whereas |
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43 # "windows-1255" and "x-mac-hebrew" are two different proper supersets of |
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44 # these code points. windows-1255 defines additional characters in the range |
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45 # 0x80-0x9F as some misc punctuation marks as well as some Hebrew-specific |
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46 # diacritics and additional 'Yiddish' ligature letters in the range 0xc0-0xd6. |
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47 # x-mac-hebrew defines similar additional code points but with a different |
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48 # mapping. |
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49 # |
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50 # As far as an average Hebrew text with no diacritics is concerned, all four |
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51 # charsets are identical with respect to code points. Meaning that for the |
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52 # main Hebrew alphabet, all four map the same values to all 27 Hebrew letters |
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53 # (including final letters). |
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54 # |
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55 # The dominant difference between these charsets is their directionality. |
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56 # "Visual" directionality means that the text is ordered as if the renderer is |
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57 # not aware of a BIDI rendering algorithm. The renderer sees the text and |
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58 # draws it from left to right. The text itself when ordered naturally is read |
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59 # backwards. A buffer of Visual Hebrew generally looks like so: |
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60 # "[last word of first line spelled backwards] [whole line ordered backwards |
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61 # and spelled backwards] [first word of first line spelled backwards] |
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62 # [end of line] [last word of second line] ... etc' " |
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63 # adding punctuation marks, numbers and English text to visual text is |
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64 # naturally also "visual" and from left to right. |
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65 # |
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66 # "Logical" directionality means the text is ordered "naturally" according to |
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67 # the order it is read. It is the responsibility of the renderer to display |
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68 # the text from right to left. A BIDI algorithm is used to place general |
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69 # punctuation marks, numbers and English text in the text. |
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70 # |
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71 # Texts in x-mac-hebrew are almost impossible to find on the Internet. From |
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72 # what little evidence I could find, it seems that its general directionality |
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73 # is Logical. |
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74 # |
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75 # To sum up all of the above, the Hebrew probing mechanism knows about two |
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76 # charsets: |
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77 # Visual Hebrew - "ISO-8859-8" - backwards text - Words and sentences are |
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78 # backwards while line order is natural. For charset recognition purposes |
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79 # the line order is unimportant (In fact, for this implementation, even |
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80 # word order is unimportant). |
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81 # Logical Hebrew - "windows-1255" - normal, naturally ordered text. |
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82 # |
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83 # "ISO-8859-8-I" is a subset of windows-1255 and doesn't need to be |
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84 # specifically identified. |
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85 # "x-mac-hebrew" is also identified as windows-1255. A text in x-mac-hebrew |
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86 # that contain special punctuation marks or diacritics is displayed with |
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87 # some unconverted characters showing as question marks. This problem might |
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88 # be corrected using another model prober for x-mac-hebrew. Due to the fact |
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89 # that x-mac-hebrew texts are so rare, writing another model prober isn't |
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90 # worth the effort and performance hit. |
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91 # |
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92 #### The Prober #### |
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93 # |
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94 # The prober is divided between two SBCharSetProbers and a HebrewProber, |
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95 # all of which are managed, created, fed data, inquired and deleted by the |
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96 # SBCSGroupProber. The two SBCharSetProbers identify that the text is in |
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97 # fact some kind of Hebrew, Logical or Visual. The final decision about which |
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98 # one is it is made by the HebrewProber by combining final-letter scores |
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99 # with the scores of the two SBCharSetProbers to produce a final answer. |
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100 # |
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101 # The SBCSGroupProber is responsible for stripping the original text of HTML |
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102 # tags, English characters, numbers, low-ASCII punctuation characters, spaces |
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103 # and new lines. It reduces any sequence of such characters to a single space. |
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104 # The buffer fed to each prober in the SBCS group prober is pure text in |
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105 # high-ASCII. |
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106 # The two SBCharSetProbers (model probers) share the same language model: |
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107 # Win1255Model. |
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108 # The first SBCharSetProber uses the model normally as any other |
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109 # SBCharSetProber does, to recognize windows-1255, upon which this model was |
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110 # built. The second SBCharSetProber is told to make the pair-of-letter |
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111 # lookup in the language model backwards. This in practice exactly simulates |
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112 # a visual Hebrew model using the windows-1255 logical Hebrew model. |
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113 # |
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114 # The HebrewProber is not using any language model. All it does is look for |
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115 # final-letter evidence suggesting the text is either logical Hebrew or visual |
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116 # Hebrew. Disjointed from the model probers, the results of the HebrewProber |
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117 # alone are meaningless. HebrewProber always returns 0.00 as confidence |
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118 # since it never identifies a charset by itself. Instead, the pointer to the |
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119 # HebrewProber is passed to the model probers as a helper "Name Prober". |
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120 # When the Group prober receives a positive identification from any prober, |
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121 # it asks for the name of the charset identified. If the prober queried is a |
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122 # Hebrew model prober, the model prober forwards the call to the |
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123 # HebrewProber to make the final decision. In the HebrewProber, the |
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124 # decision is made according to the final-letters scores maintained and Both |
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125 # model probers scores. The answer is returned in the form of the name of the |
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126 # charset identified, either "windows-1255" or "ISO-8859-8". |
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127 |
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128 class HebrewProber(CharSetProber): |
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129 # windows-1255 / ISO-8859-8 code points of interest |
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130 FINAL_KAF = 0xea |
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131 NORMAL_KAF = 0xeb |
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132 FINAL_MEM = 0xed |
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133 NORMAL_MEM = 0xee |
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134 FINAL_NUN = 0xef |
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135 NORMAL_NUN = 0xf0 |
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136 FINAL_PE = 0xf3 |
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137 NORMAL_PE = 0xf4 |
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138 FINAL_TSADI = 0xf5 |
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139 NORMAL_TSADI = 0xf6 |
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140 |
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141 # Minimum Visual vs Logical final letter score difference. |
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142 # If the difference is below this, don't rely solely on the final letter score |
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143 # distance. |
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144 MIN_FINAL_CHAR_DISTANCE = 5 |
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145 |
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146 # Minimum Visual vs Logical model score difference. |
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147 # If the difference is below this, don't rely at all on the model score |
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148 # distance. |
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149 MIN_MODEL_DISTANCE = 0.01 |
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150 |
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151 VISUAL_HEBREW_NAME = "ISO-8859-8" |
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152 LOGICAL_HEBREW_NAME = "windows-1255" |
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153 |
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154 def __init__(self): |
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155 super(HebrewProber, self).__init__() |
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156 self._final_char_logical_score = None |
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157 self._final_char_visual_score = None |
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158 self._prev = None |
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159 self._before_prev = None |
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160 self._logical_prober = None |
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161 self._visual_prober = None |
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162 self.reset() |
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163 |
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164 def reset(self): |
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165 self._final_char_logical_score = 0 |
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166 self._final_char_visual_score = 0 |
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167 # The two last characters seen in the previous buffer, |
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168 # mPrev and mBeforePrev are initialized to space in order to simulate |
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169 # a word delimiter at the beginning of the data |
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170 self._prev = ' ' |
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171 self._before_prev = ' ' |
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172 # These probers are owned by the group prober. |
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173 |
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174 def set_model_probers(self, logicalProber, visualProber): |
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175 self._logical_prober = logicalProber |
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176 self._visual_prober = visualProber |
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177 |
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178 def is_final(self, c): |
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179 return c in [self.FINAL_KAF, self.FINAL_MEM, self.FINAL_NUN, |
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180 self.FINAL_PE, self.FINAL_TSADI] |
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181 |
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182 def is_non_final(self, c): |
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183 # The normal Tsadi is not a good Non-Final letter due to words like |
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184 # 'lechotet' (to chat) containing an apostrophe after the tsadi. This |
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185 # apostrophe is converted to a space in FilterWithoutEnglishLetters |
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186 # causing the Non-Final tsadi to appear at an end of a word even |
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187 # though this is not the case in the original text. |
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188 # The letters Pe and Kaf rarely display a related behavior of not being |
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189 # a good Non-Final letter. Words like 'Pop', 'Winamp' and 'Mubarak' |
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190 # for example legally end with a Non-Final Pe or Kaf. However, the |
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191 # benefit of these letters as Non-Final letters outweighs the damage |
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192 # since these words are quite rare. |
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193 return c in [self.NORMAL_KAF, self.NORMAL_MEM, |
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194 self.NORMAL_NUN, self.NORMAL_PE] |
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195 |
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196 def feed(self, byte_str): |
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197 # Final letter analysis for logical-visual decision. |
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198 # Look for evidence that the received buffer is either logical Hebrew |
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199 # or visual Hebrew. |
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200 # The following cases are checked: |
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201 # 1) A word longer than 1 letter, ending with a final letter. This is |
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202 # an indication that the text is laid out "naturally" since the |
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203 # final letter really appears at the end. +1 for logical score. |
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204 # 2) A word longer than 1 letter, ending with a Non-Final letter. In |
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205 # normal Hebrew, words ending with Kaf, Mem, Nun, Pe or Tsadi, |
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206 # should not end with the Non-Final form of that letter. Exceptions |
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207 # to this rule are mentioned above in isNonFinal(). This is an |
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208 # indication that the text is laid out backwards. +1 for visual |
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209 # score |
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210 # 3) A word longer than 1 letter, starting with a final letter. Final |
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211 # letters should not appear at the beginning of a word. This is an |
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212 # indication that the text is laid out backwards. +1 for visual |
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213 # score. |
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214 # |
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215 # The visual score and logical score are accumulated throughout the |
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216 # text and are finally checked against each other in GetCharSetName(). |
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217 # No checking for final letters in the middle of words is done since |
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218 # that case is not an indication for either Logical or Visual text. |
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219 # |
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220 # We automatically filter out all 7-bit characters (replace them with |
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221 # spaces) so the word boundary detection works properly. [MAP] |
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222 |
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223 if self.state == ProbingState.NOT_ME: |
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224 # Both model probers say it's not them. No reason to continue. |
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225 return ProbingState.NOT_ME |
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226 |
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227 byte_str = self.filter_high_byte_only(byte_str) |
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228 |
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229 for cur in byte_str: |
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230 if cur == ' ': |
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231 # We stand on a space - a word just ended |
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232 if self._before_prev != ' ': |
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233 # next-to-last char was not a space so self._prev is not a |
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234 # 1 letter word |
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235 if self.is_final(self._prev): |
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236 # case (1) [-2:not space][-1:final letter][cur:space] |
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237 self._final_char_logical_score += 1 |
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238 elif self.is_non_final(self._prev): |
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239 # case (2) [-2:not space][-1:Non-Final letter][ |
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240 # cur:space] |
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241 self._final_char_visual_score += 1 |
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242 else: |
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243 # Not standing on a space |
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244 if ((self._before_prev == ' ') and |
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245 (self.is_final(self._prev)) and (cur != ' ')): |
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246 # case (3) [-2:space][-1:final letter][cur:not space] |
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247 self._final_char_visual_score += 1 |
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248 self._before_prev = self._prev |
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249 self._prev = cur |
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250 |
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251 # Forever detecting, till the end or until both model probers return |
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252 # ProbingState.NOT_ME (handled above) |
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253 return ProbingState.DETECTING |
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254 |
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255 @property |
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256 def charset_name(self): |
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257 # Make the decision: is it Logical or Visual? |
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258 # If the final letter score distance is dominant enough, rely on it. |
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259 finalsub = self._final_char_logical_score - self._final_char_visual_score |
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260 if finalsub >= self.MIN_FINAL_CHAR_DISTANCE: |
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261 return self.LOGICAL_HEBREW_NAME |
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262 if finalsub <= -self.MIN_FINAL_CHAR_DISTANCE: |
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263 return self.VISUAL_HEBREW_NAME |
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264 |
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265 # It's not dominant enough, try to rely on the model scores instead. |
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266 modelsub = (self._logical_prober.get_confidence() |
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267 - self._visual_prober.get_confidence()) |
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268 if modelsub > self.MIN_MODEL_DISTANCE: |
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269 return self.LOGICAL_HEBREW_NAME |
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270 if modelsub < -self.MIN_MODEL_DISTANCE: |
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271 return self.VISUAL_HEBREW_NAME |
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272 |
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273 # Still no good, back to final letter distance, maybe it'll save the |
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274 # day. |
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275 if finalsub < 0.0: |
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276 return self.VISUAL_HEBREW_NAME |
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277 |
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278 # (finalsub > 0 - Logical) or (don't know what to do) default to |
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279 # Logical. |
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280 return self.LOGICAL_HEBREW_NAME |
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281 |
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282 @property |
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283 def language(self): |
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284 return 'Hebrew' |
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285 |
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286 @property |
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287 def state(self): |
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288 # Remain active as long as any of the model probers are active. |
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289 if (self._logical_prober.state == ProbingState.NOT_ME) and \ |
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290 (self._visual_prober.state == ProbingState.NOT_ME): |
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291 return ProbingState.NOT_ME |
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292 return ProbingState.DETECTING |