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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 #########################
-
- import constants, sys
- from constants import eStart, eError, eItsMe
- from mbcharsetprober import MultiByteCharSetProber
- from codingstatemachine import CodingStateMachine
- from chardistribution import EUCJPDistributionAnalysis
- from jpcntx import EUCJPContextAnalysis
- from mbcssm import EUCJPSMModel
-
- class EUCJPProber(MultiByteCharSetProber):
- def __init__(self):
- MultiByteCharSetProber.__init__(self)
- self._mCodingSM = CodingStateMachine(EUCJPSMModel)
- self._mDistributionAnalyzer = EUCJPDistributionAnalysis()
- self._mContextAnalyzer = EUCJPContextAnalysis()
- self.reset()
-
- def reset(self):
- MultiByteCharSetProber.reset(self)
- self._mContextAnalyzer.reset()
-
- def get_charset_name(self):
- return "EUC-JP"
-
- def feed(self, aBuf):
- aLen = len(aBuf)
- for i in range(0, aLen):
- codingState = self._mCodingSM.next_state(aBuf[i])
- if codingState == eError:
- if constants._debug:
- sys.stderr.write(self.get_charset_name() + ' prober hit error at byte ' + str(i) + '\n')
- self._mState = constants.eNotMe
- break
- elif codingState == eItsMe:
- self._mState = constants.eFoundIt
- break
- elif codingState == eStart:
- charLen = self._mCodingSM.get_current_charlen()
- if i == 0:
- self._mLastChar[1] = aBuf[0]
- self._mContextAnalyzer.feed(self._mLastChar, charLen)
- self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
- else:
- self._mContextAnalyzer.feed(aBuf[i-1:i+1], charLen)
- self._mDistributionAnalyzer.feed(aBuf[i-1:i+1], charLen)
-
- self._mLastChar[0] = aBuf[aLen - 1]
-
- if self.get_state() == constants.eDetecting:
- if self._mContextAnalyzer.got_enough_data() and \
- (self.get_confidence() > constants.SHORTCUT_THRESHOLD):
- self._mState = constants.eFoundIt
-
- return self.get_state()
-
- def get_confidence(self):
- contxtCf = self._mContextAnalyzer.get_confidence()
- distribCf = self._mDistributionAnalyzer.get_confidence()
- return max(contxtCf, distribCf)
-