forked from s434596/CatOrNot
93 lines
3.7 KiB
Python
93 lines
3.7 KiB
Python
|
######################## 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)
|