Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/chardet/charsetprober.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 import logging
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30 import re
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31
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32 from .enums import ProbingState
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33
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34
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35 class CharSetProber(object):
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36
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37 SHORTCUT_THRESHOLD = 0.95
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38
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39 def __init__(self, lang_filter=None):
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40 self._state = None
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41 self.lang_filter = lang_filter
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42 self.logger = logging.getLogger(__name__)
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43
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44 def reset(self):
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45 self._state = ProbingState.DETECTING
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46
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47 @property
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48 def charset_name(self):
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49 return None
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50
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51 def feed(self, buf):
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52 pass
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53
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54 @property
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55 def state(self):
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56 return self._state
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57
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58 def get_confidence(self):
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59 return 0.0
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60
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61 @staticmethod
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62 def filter_high_byte_only(buf):
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63 buf = re.sub(b'([\x00-\x7F])+', b' ', buf)
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64 return buf
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65
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66 @staticmethod
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67 def filter_international_words(buf):
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68 """
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69 We define three types of bytes:
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70 alphabet: english alphabets [a-zA-Z]
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71 international: international characters [\x80-\xFF]
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72 marker: everything else [^a-zA-Z\x80-\xFF]
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73
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74 The input buffer can be thought to contain a series of words delimited
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75 by markers. This function works to filter all words that contain at
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76 least one international character. All contiguous sequences of markers
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77 are replaced by a single space ascii character.
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78
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79 This filter applies to all scripts which do not use English characters.
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80 """
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81 filtered = bytearray()
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82
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83 # This regex expression filters out only words that have at-least one
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84 # international character. The word may include one marker character at
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85 # the end.
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86 words = re.findall(b'[a-zA-Z]*[\x80-\xFF]+[a-zA-Z]*[^a-zA-Z\x80-\xFF]?',
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87 buf)
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88
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89 for word in words:
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90 filtered.extend(word[:-1])
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91
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92 # If the last character in the word is a marker, replace it with a
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93 # space as markers shouldn't affect our analysis (they are used
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94 # similarly across all languages and may thus have similar
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95 # frequencies).
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96 last_char = word[-1:]
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97 if not last_char.isalpha() and last_char < b'\x80':
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98 last_char = b' '
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99 filtered.extend(last_char)
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100
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101 return filtered
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102
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103 @staticmethod
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104 def filter_with_english_letters(buf):
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105 """
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106 Returns a copy of ``buf`` that retains only the sequences of English
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107 alphabet and high byte characters that are not between <> characters.
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108 Also retains English alphabet and high byte characters immediately
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109 before occurrences of >.
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110
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111 This filter can be applied to all scripts which contain both English
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112 characters and extended ASCII characters, but is currently only used by
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113 ``Latin1Prober``.
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114 """
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115 filtered = bytearray()
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116 in_tag = False
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117 prev = 0
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118
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119 for curr in range(len(buf)):
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120 # Slice here to get bytes instead of an int with Python 3
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121 buf_char = buf[curr:curr + 1]
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122 # Check if we're coming out of or entering an HTML tag
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123 if buf_char == b'>':
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124 in_tag = False
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125 elif buf_char == b'<':
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126 in_tag = True
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127
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128 # If current character is not extended-ASCII and not alphabetic...
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129 if buf_char < b'\x80' and not buf_char.isalpha():
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130 # ...and we're not in a tag
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131 if curr > prev and not in_tag:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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132 # Keep everything after last non-extended-ASCII,
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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133 # non-alphabetic character
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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134 filtered.extend(buf[prev:curr])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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135 # Output a space to delimit stretch we kept
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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136 filtered.extend(b' ')
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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137 prev = curr + 1
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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138
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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139 # If we're not in a tag...
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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140 if not in_tag:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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141 # Keep everything after last non-extended-ASCII, non-alphabetic
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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142 # character
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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143 filtered.extend(buf[prev:])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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144
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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145 return filtered