92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
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######################## BEGIN LICENSE BLOCK ########################
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# The Original Code is mozilla.org code.
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#
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# The Initial Developer of the Original Code is
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# Netscape Communications Corporation.
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# Portions created by the Initial Developer are Copyright (C) 1998
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Mark Pilgrim - port to Python
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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# 02110-1301 USA
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######################### END LICENSE BLOCK #########################
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import sys
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from .mbcharsetprober import MultiByteCharSetProber
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from .codingstatemachine import CodingStateMachine
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from .chardistribution import SJISDistributionAnalysis
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from .jpcntx import SJISContextAnalysis
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from .mbcssm import SJISSMModel
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from . import constants
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class SJISProber(MultiByteCharSetProber):
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def __init__(self):
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MultiByteCharSetProber.__init__(self)
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self._mCodingSM = CodingStateMachine(SJISSMModel)
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self._mDistributionAnalyzer = SJISDistributionAnalysis()
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self._mContextAnalyzer = SJISContextAnalysis()
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self.reset()
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def reset(self):
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MultiByteCharSetProber.reset(self)
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self._mContextAnalyzer.reset()
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def get_charset_name(self):
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return "SHIFT_JIS"
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def feed(self, aBuf):
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aLen = len(aBuf)
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for i in range(0, aLen):
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codingState = self._mCodingSM.next_state(aBuf[i])
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if codingState == constants.eError:
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if constants._debug:
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sys.stderr.write(self.get_charset_name()
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+ ' prober hit error at byte ' + str(i)
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+ '\n')
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self._mState = constants.eNotMe
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break
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elif codingState == constants.eItsMe:
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self._mState = constants.eFoundIt
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break
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elif codingState == constants.eStart:
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charLen = self._mCodingSM.get_current_charlen()
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if i == 0:
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self._mLastChar[1] = aBuf[0]
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self._mContextAnalyzer.feed(self._mLastChar[2 - charLen:],
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charLen)
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self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
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else:
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self._mContextAnalyzer.feed(aBuf[i + 1 - charLen:i + 3
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- charLen], charLen)
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self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1],
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charLen)
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self._mLastChar[0] = aBuf[aLen - 1]
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if self.get_state() == constants.eDetecting:
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if (self._mContextAnalyzer.got_enough_data() and
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(self.get_confidence() > constants.SHORTCUT_THRESHOLD)):
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self._mState = constants.eFoundIt
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return self.get_state()
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def get_confidence(self):
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contxtCf = self._mContextAnalyzer.get_confidence()
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distribCf = self._mDistributionAnalyzer.get_confidence()
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return max(contxtCf, distribCf)
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