Mercurial > repos > shellac > guppy_basecaller
annotate env/lib/python3.7/site-packages/chardet/hebrewprober.py @ 3:758bc20232e8 draft
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| author | shellac | 
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| date | Thu, 14 May 2020 16:20:52 -0400 | 
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changeset | 1 ######################## BEGIN LICENSE BLOCK ######################## | 
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changeset | 2 # The Original Code is Mozilla Universal charset detector code. | 
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changeset | 3 # | 
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changeset | 4 # The Initial Developer of the Original Code is | 
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changeset | 5 # Shy Shalom | 
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changeset | 6 # Portions created by the Initial Developer are Copyright (C) 2005 | 
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changeset | 7 # the Initial Developer. All Rights Reserved. | 
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changeset | 8 # | 
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changeset | 9 # Contributor(s): | 
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changeset | 10 # Mark Pilgrim - port to Python | 
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changeset | 11 # | 
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changeset | 12 # This library is free software; you can redistribute it and/or | 
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changeset | 13 # modify it under the terms of the GNU Lesser General Public | 
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changeset | 14 # License as published by the Free Software Foundation; either | 
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changeset | 15 # version 2.1 of the License, or (at your option) any later version. | 
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changeset | 16 # | 
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changeset | 17 # This library is distributed in the hope that it will be useful, | 
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changeset | 18 # but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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changeset | 19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | 
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changeset | 20 # Lesser General Public License for more details. | 
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changeset | 21 # | 
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changeset | 22 # You should have received a copy of the GNU Lesser General Public | 
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changeset | 23 # License along with this library; if not, write to the Free Software | 
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changeset | 24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | 
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changeset | 25 # 02110-1301 USA | 
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changeset | 26 ######################### END LICENSE BLOCK ######################### | 
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changeset | 27 | 
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changeset | 28 from .charsetprober import CharSetProber | 
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changeset | 29 from .enums import ProbingState | 
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changeset | 30 | 
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changeset | 31 # This prober doesn't actually recognize a language or a charset. | 
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changeset | 32 # It is a helper prober for the use of the Hebrew model probers | 
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changeset | 33 | 
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changeset | 34 ### General ideas of the Hebrew charset recognition ### | 
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changeset | 35 # | 
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changeset | 36 # Four main charsets exist in Hebrew: | 
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changeset | 37 # "ISO-8859-8" - Visual Hebrew | 
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changeset | 38 # "windows-1255" - Logical Hebrew | 
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changeset | 39 # "ISO-8859-8-I" - Logical Hebrew | 
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changeset | 40 # "x-mac-hebrew" - ?? Logical Hebrew ?? | 
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changeset | 41 # | 
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changeset | 42 # Both "ISO" charsets use a completely identical set of code points, whereas | 
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changeset | 43 # "windows-1255" and "x-mac-hebrew" are two different proper supersets of | 
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changeset | 44 # these code points. windows-1255 defines additional characters in the range | 
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changeset | 45 # 0x80-0x9F as some misc punctuation marks as well as some Hebrew-specific | 
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changeset | 46 # diacritics and additional 'Yiddish' ligature letters in the range 0xc0-0xd6. | 
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changeset | 47 # x-mac-hebrew defines similar additional code points but with a different | 
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changeset | 48 # mapping. | 
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changeset | 49 # | 
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changeset | 50 # As far as an average Hebrew text with no diacritics is concerned, all four | 
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changeset | 51 # charsets are identical with respect to code points. Meaning that for the | 
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changeset | 52 # main Hebrew alphabet, all four map the same values to all 27 Hebrew letters | 
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changeset | 53 # (including final letters). | 
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changeset | 54 # | 
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changeset | 55 # The dominant difference between these charsets is their directionality. | 
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changeset | 56 # "Visual" directionality means that the text is ordered as if the renderer is | 
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changeset | 57 # not aware of a BIDI rendering algorithm. The renderer sees the text and | 
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changeset | 58 # draws it from left to right. The text itself when ordered naturally is read | 
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changeset | 59 # backwards. A buffer of Visual Hebrew generally looks like so: | 
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changeset | 60 # "[last word of first line spelled backwards] [whole line ordered backwards | 
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changeset | 61 # and spelled backwards] [first word of first line spelled backwards] | 
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changeset | 62 # [end of line] [last word of second line] ... etc' " | 
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changeset | 63 # adding punctuation marks, numbers and English text to visual text is | 
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changeset | 64 # naturally also "visual" and from left to right. | 
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changeset | 65 # | 
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changeset | 66 # "Logical" directionality means the text is ordered "naturally" according to | 
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changeset | 67 # the order it is read. It is the responsibility of the renderer to display | 
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changeset | 68 # the text from right to left. A BIDI algorithm is used to place general | 
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changeset | 69 # punctuation marks, numbers and English text in the text. | 
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changeset | 70 # | 
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changeset | 71 # Texts in x-mac-hebrew are almost impossible to find on the Internet. From | 
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changeset | 72 # what little evidence I could find, it seems that its general directionality | 
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changeset | 73 # is Logical. | 
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changeset | 74 # | 
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changeset | 75 # To sum up all of the above, the Hebrew probing mechanism knows about two | 
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changeset | 76 # charsets: | 
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changeset | 77 # Visual Hebrew - "ISO-8859-8" - backwards text - Words and sentences are | 
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changeset | 78 # backwards while line order is natural. For charset recognition purposes | 
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changeset | 79 # the line order is unimportant (In fact, for this implementation, even | 
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changeset | 80 # word order is unimportant). | 
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changeset | 81 # Logical Hebrew - "windows-1255" - normal, naturally ordered text. | 
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changeset | 82 # | 
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changeset | 83 # "ISO-8859-8-I" is a subset of windows-1255 and doesn't need to be | 
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changeset | 84 # specifically identified. | 
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changeset | 85 # "x-mac-hebrew" is also identified as windows-1255. A text in x-mac-hebrew | 
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changeset | 86 # that contain special punctuation marks or diacritics is displayed with | 
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changeset | 87 # some unconverted characters showing as question marks. This problem might | 
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changeset | 88 # be corrected using another model prober for x-mac-hebrew. Due to the fact | 
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changeset | 89 # that x-mac-hebrew texts are so rare, writing another model prober isn't | 
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changeset | 90 # worth the effort and performance hit. | 
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changeset | 91 # | 
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changeset | 92 #### The Prober #### | 
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changeset | 93 # | 
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changeset | 94 # The prober is divided between two SBCharSetProbers and a HebrewProber, | 
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changeset | 95 # all of which are managed, created, fed data, inquired and deleted by the | 
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changeset | 96 # SBCSGroupProber. The two SBCharSetProbers identify that the text is in | 
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changeset | 97 # fact some kind of Hebrew, Logical or Visual. The final decision about which | 
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changeset | 98 # one is it is made by the HebrewProber by combining final-letter scores | 
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changeset | 99 # with the scores of the two SBCharSetProbers to produce a final answer. | 
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changeset | 100 # | 
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changeset | 101 # The SBCSGroupProber is responsible for stripping the original text of HTML | 
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changeset | 102 # tags, English characters, numbers, low-ASCII punctuation characters, spaces | 
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changeset | 103 # and new lines. It reduces any sequence of such characters to a single space. | 
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changeset | 104 # The buffer fed to each prober in the SBCS group prober is pure text in | 
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changeset | 105 # high-ASCII. | 
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changeset | 106 # The two SBCharSetProbers (model probers) share the same language model: | 
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changeset | 107 # Win1255Model. | 
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changeset | 108 # The first SBCharSetProber uses the model normally as any other | 
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changeset | 109 # SBCharSetProber does, to recognize windows-1255, upon which this model was | 
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changeset | 110 # built. The second SBCharSetProber is told to make the pair-of-letter | 
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changeset | 111 # lookup in the language model backwards. This in practice exactly simulates | 
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changeset | 112 # a visual Hebrew model using the windows-1255 logical Hebrew model. | 
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changeset | 113 # | 
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changeset | 114 # The HebrewProber is not using any language model. All it does is look for | 
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changeset | 115 # final-letter evidence suggesting the text is either logical Hebrew or visual | 
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changeset | 116 # Hebrew. Disjointed from the model probers, the results of the HebrewProber | 
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changeset | 117 # alone are meaningless. HebrewProber always returns 0.00 as confidence | 
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changeset | 118 # since it never identifies a charset by itself. Instead, the pointer to the | 
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changeset | 119 # HebrewProber is passed to the model probers as a helper "Name Prober". | 
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changeset | 120 # When the Group prober receives a positive identification from any prober, | 
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changeset | 121 # it asks for the name of the charset identified. If the prober queried is a | 
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changeset | 122 # Hebrew model prober, the model prober forwards the call to the | 
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changeset | 123 # HebrewProber to make the final decision. In the HebrewProber, the | 
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changeset | 124 # decision is made according to the final-letters scores maintained and Both | 
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changeset | 125 # model probers scores. The answer is returned in the form of the name of the | 
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changeset | 126 # charset identified, either "windows-1255" or "ISO-8859-8". | 
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changeset | 127 | 
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changeset | 128 class HebrewProber(CharSetProber): | 
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changeset | 129 # windows-1255 / ISO-8859-8 code points of interest | 
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changeset | 130 FINAL_KAF = 0xea | 
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changeset | 131 NORMAL_KAF = 0xeb | 
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changeset | 132 FINAL_MEM = 0xed | 
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changeset | 133 NORMAL_MEM = 0xee | 
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changeset | 134 FINAL_NUN = 0xef | 
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changeset | 135 NORMAL_NUN = 0xf0 | 
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changeset | 136 FINAL_PE = 0xf3 | 
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changeset | 137 NORMAL_PE = 0xf4 | 
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changeset | 138 FINAL_TSADI = 0xf5 | 
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changeset | 139 NORMAL_TSADI = 0xf6 | 
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changeset | 140 | 
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changeset | 141 # Minimum Visual vs Logical final letter score difference. | 
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changeset | 142 # If the difference is below this, don't rely solely on the final letter score | 
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changeset | 143 # distance. | 
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changeset | 144 MIN_FINAL_CHAR_DISTANCE = 5 | 
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changeset | 145 | 
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changeset | 146 # Minimum Visual vs Logical model score difference. | 
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changeset | 147 # If the difference is below this, don't rely at all on the model score | 
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changeset | 148 # distance. | 
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changeset | 149 MIN_MODEL_DISTANCE = 0.01 | 
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changeset | 150 | 
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changeset | 151 VISUAL_HEBREW_NAME = "ISO-8859-8" | 
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changeset | 152 LOGICAL_HEBREW_NAME = "windows-1255" | 
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changeset | 153 | 
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changeset | 154 def __init__(self): | 
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changeset | 155 super(HebrewProber, self).__init__() | 
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changeset | 156 self._final_char_logical_score = None | 
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changeset | 157 self._final_char_visual_score = None | 
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changeset | 158 self._prev = None | 
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changeset | 159 self._before_prev = None | 
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changeset | 160 self._logical_prober = None | 
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changeset | 161 self._visual_prober = None | 
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changeset | 162 self.reset() | 
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changeset | 163 | 
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changeset | 164 def reset(self): | 
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changeset | 165 self._final_char_logical_score = 0 | 
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changeset | 166 self._final_char_visual_score = 0 | 
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changeset | 167 # The two last characters seen in the previous buffer, | 
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changeset | 168 # mPrev and mBeforePrev are initialized to space in order to simulate | 
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changeset | 169 # a word delimiter at the beginning of the data | 
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changeset | 170 self._prev = ' ' | 
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changeset | 171 self._before_prev = ' ' | 
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changeset | 172 # These probers are owned by the group prober. | 
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changeset | 173 | 
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changeset | 174 def set_model_probers(self, logicalProber, visualProber): | 
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changeset | 175 self._logical_prober = logicalProber | 
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changeset | 176 self._visual_prober = visualProber | 
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changeset | 177 | 
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changeset | 178 def is_final(self, c): | 
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changeset | 179 return c in [self.FINAL_KAF, self.FINAL_MEM, self.FINAL_NUN, | 
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changeset | 180 self.FINAL_PE, self.FINAL_TSADI] | 
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changeset | 181 | 
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changeset | 182 def is_non_final(self, c): | 
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changeset | 183 # The normal Tsadi is not a good Non-Final letter due to words like | 
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changeset | 184 # 'lechotet' (to chat) containing an apostrophe after the tsadi. This | 
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changeset | 185 # apostrophe is converted to a space in FilterWithoutEnglishLetters | 
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changeset | 186 # causing the Non-Final tsadi to appear at an end of a word even | 
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changeset | 187 # though this is not the case in the original text. | 
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changeset | 188 # The letters Pe and Kaf rarely display a related behavior of not being | 
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changeset | 189 # a good Non-Final letter. Words like 'Pop', 'Winamp' and 'Mubarak' | 
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changeset | 190 # for example legally end with a Non-Final Pe or Kaf. However, the | 
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changeset | 191 # benefit of these letters as Non-Final letters outweighs the damage | 
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changeset | 192 # since these words are quite rare. | 
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changeset | 193 return c in [self.NORMAL_KAF, self.NORMAL_MEM, | 
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changeset | 194 self.NORMAL_NUN, self.NORMAL_PE] | 
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changeset | 195 | 
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changeset | 196 def feed(self, byte_str): | 
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changeset | 197 # Final letter analysis for logical-visual decision. | 
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changeset | 198 # Look for evidence that the received buffer is either logical Hebrew | 
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changeset | 199 # or visual Hebrew. | 
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changeset | 200 # The following cases are checked: | 
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changeset | 201 # 1) A word longer than 1 letter, ending with a final letter. This is | 
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changeset | 202 # an indication that the text is laid out "naturally" since the | 
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changeset | 203 # final letter really appears at the end. +1 for logical score. | 
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changeset | 204 # 2) A word longer than 1 letter, ending with a Non-Final letter. In | 
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changeset | 205 # normal Hebrew, words ending with Kaf, Mem, Nun, Pe or Tsadi, | 
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changeset | 206 # should not end with the Non-Final form of that letter. Exceptions | 
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changeset | 207 # to this rule are mentioned above in isNonFinal(). This is an | 
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changeset | 208 # indication that the text is laid out backwards. +1 for visual | 
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changeset | 209 # score | 
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changeset | 210 # 3) A word longer than 1 letter, starting with a final letter. Final | 
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changeset | 211 # letters should not appear at the beginning of a word. This is an | 
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changeset | 212 # indication that the text is laid out backwards. +1 for visual | 
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changeset | 213 # score. | 
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changeset | 214 # | 
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changeset | 215 # The visual score and logical score are accumulated throughout the | 
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changeset | 216 # text and are finally checked against each other in GetCharSetName(). | 
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changeset | 217 # No checking for final letters in the middle of words is done since | 
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changeset | 218 # that case is not an indication for either Logical or Visual text. | 
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changeset | 219 # | 
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changeset | 220 # We automatically filter out all 7-bit characters (replace them with | 
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changeset | 221 # spaces) so the word boundary detection works properly. [MAP] | 
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changeset | 222 | 
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changeset | 223 if self.state == ProbingState.NOT_ME: | 
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changeset | 224 # Both model probers say it's not them. No reason to continue. | 
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changeset | 225 return ProbingState.NOT_ME | 
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changeset | 226 | 
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changeset | 227 byte_str = self.filter_high_byte_only(byte_str) | 
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changeset | 228 | 
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changeset | 229 for cur in byte_str: | 
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changeset | 230 if cur == ' ': | 
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changeset | 231 # We stand on a space - a word just ended | 
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changeset | 232 if self._before_prev != ' ': | 
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changeset | 233 # next-to-last char was not a space so self._prev is not a | 
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changeset | 234 # 1 letter word | 
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changeset | 235 if self.is_final(self._prev): | 
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changeset | 236 # case (1) [-2:not space][-1:final letter][cur:space] | 
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changeset | 237 self._final_char_logical_score += 1 | 
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changeset | 238 elif self.is_non_final(self._prev): | 
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changeset | 239 # case (2) [-2:not space][-1:Non-Final letter][ | 
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changeset | 240 # cur:space] | 
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changeset | 241 self._final_char_visual_score += 1 | 
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changeset | 242 else: | 
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changeset | 243 # Not standing on a space | 
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changeset | 244 if ((self._before_prev == ' ') and | 
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changeset | 245 (self.is_final(self._prev)) and (cur != ' ')): | 
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changeset | 246 # case (3) [-2:space][-1:final letter][cur:not space] | 
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changeset | 247 self._final_char_visual_score += 1 | 
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changeset | 248 self._before_prev = self._prev | 
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changeset | 249 self._prev = cur | 
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changeset | 250 | 
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changeset | 251 # Forever detecting, till the end or until both model probers return | 
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changeset | 252 # ProbingState.NOT_ME (handled above) | 
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changeset | 253 return ProbingState.DETECTING | 
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changeset | 254 | 
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changeset | 255 @property | 
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changeset | 256 def charset_name(self): | 
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changeset | 257 # Make the decision: is it Logical or Visual? | 
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changeset | 258 # If the final letter score distance is dominant enough, rely on it. | 
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changeset | 259 finalsub = self._final_char_logical_score - self._final_char_visual_score | 
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changeset | 260 if finalsub >= self.MIN_FINAL_CHAR_DISTANCE: | 
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changeset | 261 return self.LOGICAL_HEBREW_NAME | 
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changeset | 262 if finalsub <= -self.MIN_FINAL_CHAR_DISTANCE: | 
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changeset | 263 return self.VISUAL_HEBREW_NAME | 
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changeset | 264 | 
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changeset | 265 # It's not dominant enough, try to rely on the model scores instead. | 
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changeset | 266 modelsub = (self._logical_prober.get_confidence() | 
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changeset | 267 - self._visual_prober.get_confidence()) | 
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changeset | 268 if modelsub > self.MIN_MODEL_DISTANCE: | 
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changeset | 269 return self.LOGICAL_HEBREW_NAME | 
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changeset | 270 if modelsub < -self.MIN_MODEL_DISTANCE: | 
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changeset | 271 return self.VISUAL_HEBREW_NAME | 
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changeset | 272 | 
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changeset | 273 # Still no good, back to final letter distance, maybe it'll save the | 
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changeset | 274 # day. | 
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changeset | 275 if finalsub < 0.0: | 
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changeset | 276 return self.VISUAL_HEBREW_NAME | 
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changeset | 277 | 
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changeset | 278 # (finalsub > 0 - Logical) or (don't know what to do) default to | 
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changeset | 279 # Logical. | 
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changeset | 280 return self.LOGICAL_HEBREW_NAME | 
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changeset | 281 | 
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changeset | 282 @property | 
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changeset | 283 def language(self): | 
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changeset | 284 return 'Hebrew' | 
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changeset | 285 | 
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changeset | 286 @property | 
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changeset | 287 def state(self): | 
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changeset | 288 # Remain active as long as any of the model probers are active. | 
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changeset | 289 if (self._logical_prober.state == ProbingState.NOT_ME) and \ | 
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changeset | 290 (self._visual_prober.state == ProbingState.NOT_ME): | 
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changeset | 291 return ProbingState.NOT_ME | 
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changeset | 292 return ProbingState.DETECTING | 
