| ######################## 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 sys |
| from .mbcharsetprober import MultiByteCharSetProber |
| from .codingstatemachine import CodingStateMachine |
| from .chardistribution import SJISDistributionAnalysis |
| from .jpcntx import SJISContextAnalysis |
| from .mbcssm import SJISSMModel |
| from . import constants |
| |
| |
| class SJISProber(MultiByteCharSetProber): |
| def __init__(self): |
| MultiByteCharSetProber.__init__(self) |
| self._mCodingSM = CodingStateMachine(SJISSMModel) |
| self._mDistributionAnalyzer = SJISDistributionAnalysis() |
| self._mContextAnalyzer = SJISContextAnalysis() |
| self.reset() |
| |
| def reset(self): |
| MultiByteCharSetProber.reset(self) |
| self._mContextAnalyzer.reset() |
| |
| def get_charset_name(self): |
| return self._mContextAnalyzer.get_charset_name() |
| |
| def feed(self, aBuf): |
| aLen = len(aBuf) |
| for i in range(0, aLen): |
| codingState = self._mCodingSM.next_state(aBuf[i]) |
| if codingState == constants.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 == constants.eItsMe: |
| self._mState = constants.eFoundIt |
| break |
| elif codingState == constants.eStart: |
| charLen = self._mCodingSM.get_current_charlen() |
| if i == 0: |
| self._mLastChar[1] = aBuf[0] |
| self._mContextAnalyzer.feed(self._mLastChar[2 - charLen:], |
| charLen) |
| self._mDistributionAnalyzer.feed(self._mLastChar, charLen) |
| else: |
| self._mContextAnalyzer.feed(aBuf[i + 1 - charLen:i + 3 |
| - charLen], 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) |
