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escprober.py

######################## 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
from escsm import HZSMModel, ISO2022CNSMModel, ISO2022JPSMModel, ISO2022KRSMModel
from charsetprober import CharSetProber
from codingstatemachine import CodingStateMachine

class EscCharSetProber(CharSetProber):
    def __init__(self):
        CharSetProber.__init__(self)
        self._mCodingSM = [ \
            CodingStateMachine(HZSMModel),
            CodingStateMachine(ISO2022CNSMModel),
            CodingStateMachine(ISO2022JPSMModel),
            CodingStateMachine(ISO2022KRSMModel)
            ]
        self.reset()

    def reset(self):
        CharSetProber.reset(self)
        for codingSM in self._mCodingSM:
            if not codingSM: continue
            codingSM.active = constants.True
            codingSM.reset()
        self._mActiveSM = len(self._mCodingSM)
        self._mDetectedCharset = None

    def get_charset_name(self):
        return self._mDetectedCharset

    def get_confidence(self):
        if self._mDetectedCharset:
            return 0.99
        else:
            return 0.00

    def feed(self, aBuf):
        for c in aBuf:
            for codingSM in self._mCodingSM:
                if not codingSM: continue
                if not codingSM.active: continue
                codingState = codingSM.next_state(c)
                if codingState == constants.eError:
                    codingSM.active = constants.False
                    self._mActiveSM -= 1
                    if self._mActiveSM <= 0:
                        self._mState = constants.eNotMe
                        return self.get_state()
                elif codingState == constants.eItsMe:
                    self._mState = constants.eFoundIt
                    self._mDetectedCharset = codingSM.get_coding_state_machine()
                    return self.get_state()

        return self.get_state()

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