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annotate planemo/lib/python3.7/site-packages/chardet/escprober.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 .charsetprober import CharSetProber
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29 from .codingstatemachine import CodingStateMachine
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30 from .enums import LanguageFilter, ProbingState, MachineState
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31 from .escsm import (HZ_SM_MODEL, ISO2022CN_SM_MODEL, ISO2022JP_SM_MODEL,
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32 ISO2022KR_SM_MODEL)
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33
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34
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35 class EscCharSetProber(CharSetProber):
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36 """
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37 This CharSetProber uses a "code scheme" approach for detecting encodings,
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38 whereby easily recognizable escape or shift sequences are relied on to
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39 identify these encodings.
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40 """
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41
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42 def __init__(self, lang_filter=None):
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43 super(EscCharSetProber, self).__init__(lang_filter=lang_filter)
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44 self.coding_sm = []
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45 if self.lang_filter & LanguageFilter.CHINESE_SIMPLIFIED:
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46 self.coding_sm.append(CodingStateMachine(HZ_SM_MODEL))
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47 self.coding_sm.append(CodingStateMachine(ISO2022CN_SM_MODEL))
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48 if self.lang_filter & LanguageFilter.JAPANESE:
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49 self.coding_sm.append(CodingStateMachine(ISO2022JP_SM_MODEL))
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50 if self.lang_filter & LanguageFilter.KOREAN:
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51 self.coding_sm.append(CodingStateMachine(ISO2022KR_SM_MODEL))
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52 self.active_sm_count = None
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53 self._detected_charset = None
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54 self._detected_language = None
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55 self._state = None
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56 self.reset()
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57
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58 def reset(self):
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59 super(EscCharSetProber, self).reset()
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60 for coding_sm in self.coding_sm:
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61 if not coding_sm:
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62 continue
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63 coding_sm.active = True
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64 coding_sm.reset()
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65 self.active_sm_count = len(self.coding_sm)
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66 self._detected_charset = None
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67 self._detected_language = None
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68
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69 @property
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70 def charset_name(self):
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71 return self._detected_charset
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72
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73 @property
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74 def language(self):
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75 return self._detected_language
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76
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77 def get_confidence(self):
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78 if self._detected_charset:
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79 return 0.99
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80 else:
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81 return 0.00
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82
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83 def feed(self, byte_str):
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84 for c in byte_str:
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85 for coding_sm in self.coding_sm:
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86 if not coding_sm or not coding_sm.active:
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87 continue
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88 coding_state = coding_sm.next_state(c)
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89 if coding_state == MachineState.ERROR:
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90 coding_sm.active = False
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91 self.active_sm_count -= 1
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92 if self.active_sm_count <= 0:
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93 self._state = ProbingState.NOT_ME
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94 return self.state
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95 elif coding_state == MachineState.ITS_ME:
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96 self._state = ProbingState.FOUND_IT
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97 self._detected_charset = coding_sm.get_coding_state_machine()
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98 self._detected_language = coding_sm.language
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99 return self.state
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100
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101 return self.state