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annotate planemo/lib/python3.7/site-packages/chardet/eucjpprober.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.org 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 .enums import ProbingState, MachineState
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29 from .mbcharsetprober import MultiByteCharSetProber
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30 from .codingstatemachine import CodingStateMachine
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31 from .chardistribution import EUCJPDistributionAnalysis
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32 from .jpcntx import EUCJPContextAnalysis
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33 from .mbcssm import EUCJP_SM_MODEL
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34
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35
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36 class EUCJPProber(MultiByteCharSetProber):
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37 def __init__(self):
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38 super(EUCJPProber, self).__init__()
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39 self.coding_sm = CodingStateMachine(EUCJP_SM_MODEL)
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40 self.distribution_analyzer = EUCJPDistributionAnalysis()
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41 self.context_analyzer = EUCJPContextAnalysis()
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42 self.reset()
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43
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44 def reset(self):
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45 super(EUCJPProber, self).reset()
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46 self.context_analyzer.reset()
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47
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48 @property
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49 def charset_name(self):
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50 return "EUC-JP"
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51
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52 @property
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53 def language(self):
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54 return "Japanese"
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55
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56 def feed(self, byte_str):
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57 for i in range(len(byte_str)):
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58 # PY3K: byte_str is a byte array, so byte_str[i] is an int, not a byte
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59 coding_state = self.coding_sm.next_state(byte_str[i])
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60 if coding_state == MachineState.ERROR:
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61 self.logger.debug('%s %s prober hit error at byte %s',
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62 self.charset_name, self.language, i)
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63 self._state = ProbingState.NOT_ME
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64 break
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65 elif coding_state == MachineState.ITS_ME:
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66 self._state = ProbingState.FOUND_IT
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67 break
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68 elif coding_state == MachineState.START:
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69 char_len = self.coding_sm.get_current_charlen()
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70 if i == 0:
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71 self._last_char[1] = byte_str[0]
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72 self.context_analyzer.feed(self._last_char, char_len)
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73 self.distribution_analyzer.feed(self._last_char, char_len)
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74 else:
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75 self.context_analyzer.feed(byte_str[i - 1:i + 1],
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76 char_len)
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77 self.distribution_analyzer.feed(byte_str[i - 1:i + 1],
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78 char_len)
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79
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80 self._last_char[0] = byte_str[-1]
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81
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82 if self.state == ProbingState.DETECTING:
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83 if (self.context_analyzer.got_enough_data() and
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84 (self.get_confidence() > self.SHORTCUT_THRESHOLD)):
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85 self._state = ProbingState.FOUND_IT
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86
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87 return self.state
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88
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89 def get_confidence(self):
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90 context_conf = self.context_analyzer.get_confidence()
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91 distrib_conf = self.distribution_analyzer.get_confidence()
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92 return max(context_conf, distrib_conf)