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- ######################## BEGIN LICENSE BLOCK ########################
- # The Original Code is mozilla.org code.
- #
- # The Initial Developer of the Original Code is
- # Netscape Communications Corporation.
- # Portions created by the Initial Developer are Copyright (C) 1998
- # the Initial Developer. All Rights Reserved.
- #
- # Contributor(s):
- # Mark Pilgrim - port to Python
- #
- # This library is free software; you can redistribute it and/or
- # modify it under the terms of the GNU Lesser General Public
- # License as published by the Free Software Foundation; either
- # version 2.1 of the License, or (at your option) any later version.
- #
- # This library is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- # Lesser General Public License for more details.
- #
- # You should have received a copy of the GNU Lesser General Public
- # License along with this library; if not, write to the Free Software
- # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- # 02110-1301 USA
- ######################### END LICENSE BLOCK #########################
- from .mbcharsetprober import MultiByteCharSetProber
- from .codingstatemachine import CodingStateMachine
- from .chardistribution import SJISDistributionAnalysis
- from .jpcntx import SJISContextAnalysis
- from .mbcssm import SJIS_SM_MODEL
- from .enums import ProbingState, MachineState
- class SJISProber(MultiByteCharSetProber):
- def __init__(self):
- super(SJISProber, self).__init__()
- self.coding_sm = CodingStateMachine(SJIS_SM_MODEL)
- self.distribution_analyzer = SJISDistributionAnalysis()
- self.context_analyzer = SJISContextAnalysis()
- self.reset()
- def reset(self):
- super(SJISProber, self).reset()
- self.context_analyzer.reset()
- @property
- def charset_name(self):
- return self.context_analyzer.charset_name
- @property
- def language(self):
- return "Japanese"
- def feed(self, byte_str):
- for i in range(len(byte_str)):
- coding_state = self.coding_sm.next_state(byte_str[i])
- if coding_state == MachineState.ERROR:
- self.logger.debug('%s %s prober hit error at byte %s',
- self.charset_name, self.language, i)
- self._state = ProbingState.NOT_ME
- break
- elif coding_state == MachineState.ITS_ME:
- self._state = ProbingState.FOUND_IT
- break
- elif coding_state == MachineState.START:
- char_len = self.coding_sm.get_current_charlen()
- if i == 0:
- self._last_char[1] = byte_str[0]
- self.context_analyzer.feed(self._last_char[2 - char_len:],
- char_len)
- self.distribution_analyzer.feed(self._last_char, char_len)
- else:
- self.context_analyzer.feed(byte_str[i + 1 - char_len:i + 3
- - char_len], char_len)
- self.distribution_analyzer.feed(byte_str[i - 1:i + 1],
- char_len)
- self._last_char[0] = byte_str[-1]
- if self.state == ProbingState.DETECTING:
- if (self.context_analyzer.got_enough_data() and
- (self.get_confidence() > self.SHORTCUT_THRESHOLD)):
- self._state = ProbingState.FOUND_IT
- return self.state
- def get_confidence(self):
- context_conf = self.context_analyzer.get_confidence()
- distrib_conf = self.distribution_analyzer.get_confidence()
- return max(context_conf, distrib_conf)
|
