Application: gvSIG desktop » gvSIG scripting

######################## 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)