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annotate planemo/lib/python3.7/site-packages/chardet/mbcharsetprober.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 # Proofpoint, Inc.
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13 #
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14 # This library is free software; you can redistribute it and/or
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15 # modify it under the terms of the GNU Lesser General Public
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16 # License as published by the Free Software Foundation; either
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17 # version 2.1 of the License, or (at your option) any later version.
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18 #
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19 # This library is distributed in the hope that it will be useful,
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20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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22 # Lesser General Public License for more details.
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23 #
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24 # You should have received a copy of the GNU Lesser General Public
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25 # License along with this library; if not, write to the Free Software
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26 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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27 # 02110-1301 USA
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28 ######################### END LICENSE BLOCK #########################
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29
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30 from .charsetprober import CharSetProber
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31 from .enums import ProbingState, MachineState
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32
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33
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34 class MultiByteCharSetProber(CharSetProber):
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35 """
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36 MultiByteCharSetProber
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37 """
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38
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39 def __init__(self, lang_filter=None):
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40 super(MultiByteCharSetProber, self).__init__(lang_filter=lang_filter)
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41 self.distribution_analyzer = None
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42 self.coding_sm = None
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43 self._last_char = [0, 0]
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44
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45 def reset(self):
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46 super(MultiByteCharSetProber, self).reset()
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47 if self.coding_sm:
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48 self.coding_sm.reset()
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49 if self.distribution_analyzer:
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50 self.distribution_analyzer.reset()
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51 self._last_char = [0, 0]
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52
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53 @property
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54 def charset_name(self):
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55 raise NotImplementedError
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56
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57 @property
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58 def language(self):
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59 raise NotImplementedError
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60
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61 def feed(self, byte_str):
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62 for i in range(len(byte_str)):
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63 coding_state = self.coding_sm.next_state(byte_str[i])
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64 if coding_state == MachineState.ERROR:
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65 self.logger.debug('%s %s prober hit error at byte %s',
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66 self.charset_name, self.language, i)
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67 self._state = ProbingState.NOT_ME
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68 break
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69 elif coding_state == MachineState.ITS_ME:
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70 self._state = ProbingState.FOUND_IT
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71 break
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72 elif coding_state == MachineState.START:
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73 char_len = self.coding_sm.get_current_charlen()
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74 if i == 0:
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75 self._last_char[1] = byte_str[0]
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76 self.distribution_analyzer.feed(self._last_char, char_len)
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77 else:
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78 self.distribution_analyzer.feed(byte_str[i - 1:i + 1],
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79 char_len)
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80
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81 self._last_char[0] = byte_str[-1]
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82
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83 if self.state == ProbingState.DETECTING:
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84 if (self.distribution_analyzer.got_enough_data() and
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85 (self.get_confidence() > self.SHORTCUT_THRESHOLD)):
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86 self._state = ProbingState.FOUND_IT
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87
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88 return self.state
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89
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90 def get_confidence(self):
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91 return self.distribution_analyzer.get_confidence()