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77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
######################## 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 constants, sys
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from constants import eStart, eError, eItsMe
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from charsetprober import CharSetProber
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from codingstatemachine import CodingStateMachine
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from mbcssm import UTF8SMModel
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ONE_CHAR_PROB = 0.5
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class UTF8Prober(CharSetProber):
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def __init__(self):
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CharSetProber.__init__(self)
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self._mCodingSM = CodingStateMachine(UTF8SMModel)
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self.reset()
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def reset(self):
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CharSetProber.reset(self)
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self._mCodingSM.reset()
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self._mNumOfMBChar = 0
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def get_charset_name(self):
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return "utf-8"
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def feed(self, aBuf):
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for c in aBuf:
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codingState = self._mCodingSM.next_state(c)
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if codingState == eError:
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self._mState = constants.eNotMe
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break
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elif codingState == eItsMe:
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self._mState = constants.eFoundIt
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break
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elif codingState == eStart:
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if self._mCodingSM.get_current_charlen() >= 2:
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self._mNumOfMBChar += 1
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if self.get_state() == constants.eDetecting:
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if 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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unlike = 0.99
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if self._mNumOfMBChar < 6:
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for i in xrange(0, self._mNumOfMBChar):
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unlike = unlike * ONE_CHAR_PROB
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return 1.0 - unlike
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else:
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return unlike
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