Mercurial > repos > shellac > guppy_basecaller

comparison env/lib/python3.7/site-packages/chardet/sjisprober.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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-1:000000000000 0:26e78fe6e8c4
1 ######################## BEGIN LICENSE BLOCK ########################
2 # The Original Code is mozilla.org code.
3 #
4 # The Initial Developer of the Original Code is
5 # Netscape Communications Corporation.
6 # Portions created by the Initial Developer are Copyright (C) 1998
7 # the Initial Developer. All Rights Reserved.
8 #
9 # Contributor(s):
10 # Mark Pilgrim - port to Python
11 #
12 # This library is free software; you can redistribute it and/or
13 # modify it under the terms of the GNU Lesser General Public
14 # License as published by the Free Software Foundation; either
15 # version 2.1 of the License, or (at your option) any later version.
16 #
17 # This library is distributed in the hope that it will be useful,
18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 # Lesser General Public License for more details.
21 #
22 # You should have received a copy of the GNU Lesser General Public
23 # License along with this library; if not, write to the Free Software
24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
25 # 02110-1301 USA
26 ######################### END LICENSE BLOCK #########################
27
28 from .mbcharsetprober import MultiByteCharSetProber
29 from .codingstatemachine import CodingStateMachine
30 from .chardistribution import SJISDistributionAnalysis
31 from .jpcntx import SJISContextAnalysis
32 from .mbcssm import SJIS_SM_MODEL
33 from .enums import ProbingState, MachineState
34
35
36 class SJISProber(MultiByteCharSetProber):
37 def __init__(self):
38 super(SJISProber, self).__init__()
39 self.coding_sm = CodingStateMachine(SJIS_SM_MODEL)
40 self.distribution_analyzer = SJISDistributionAnalysis()
41 self.context_analyzer = SJISContextAnalysis()
42 self.reset()
43
44 def reset(self):
45 super(SJISProber, self).reset()
46 self.context_analyzer.reset()
47
48 @property
49 def charset_name(self):
50 return self.context_analyzer.charset_name
51
52 @property
53 def language(self):
54 return "Japanese"
55
56 def feed(self, byte_str):
57 for i in range(len(byte_str)):
58 coding_state = self.coding_sm.next_state(byte_str[i])
59 if coding_state == MachineState.ERROR:
60 self.logger.debug('%s %s prober hit error at byte %s',
61 self.charset_name, self.language, i)
62 self._state = ProbingState.NOT_ME
63 break
64 elif coding_state == MachineState.ITS_ME:
65 self._state = ProbingState.FOUND_IT
66 break
67 elif coding_state == MachineState.START:
68 char_len = self.coding_sm.get_current_charlen()
69 if i == 0:
70 self._last_char[1] = byte_str[0]
71 self.context_analyzer.feed(self._last_char[2 - char_len:],
72 char_len)
73 self.distribution_analyzer.feed(self._last_char, char_len)
74 else:
75 self.context_analyzer.feed(byte_str[i + 1 - char_len:i + 3
76 - char_len], char_len)
77 self.distribution_analyzer.feed(byte_str[i - 1:i + 1],
78 char_len)
79
80 self._last_char[0] = byte_str[-1]
81
82 if self.state == ProbingState.DETECTING:
83 if (self.context_analyzer.got_enough_data() and
84 (self.get_confidence() > self.SHORTCUT_THRESHOLD)):
85 self._state = ProbingState.FOUND_IT
86
87 return self.state
88
89 def get_confidence(self):
90 context_conf = self.context_analyzer.get_confidence()
91 distrib_conf = self.distribution_analyzer.get_confidence()
92 return max(context_conf, distrib_conf)