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Direktori : /usr/lib/python2.7/site-packages/chardet/ |
Current File : //usr/lib/python2.7/site-packages/chardet/utf8prober.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 ######################### from . import constants from .charsetprober import CharSetProber from .codingstatemachine import CodingStateMachine from .mbcssm import UTF8SMModel ONE_CHAR_PROB = 0.5 class UTF8Prober(CharSetProber): def __init__(self): CharSetProber.__init__(self) self._mCodingSM = CodingStateMachine(UTF8SMModel) self.reset() def reset(self): CharSetProber.reset(self) self._mCodingSM.reset() self._mNumOfMBChar = 0 def get_charset_name(self): return "utf-8" def feed(self, aBuf): for c in aBuf: codingState = self._mCodingSM.next_state(c) if codingState == constants.eError: self._mState = constants.eNotMe break elif codingState == constants.eItsMe: self._mState = constants.eFoundIt break elif codingState == constants.eStart: if self._mCodingSM.get_current_charlen() >= 2: self._mNumOfMBChar += 1 if self.get_state() == constants.eDetecting: if self.get_confidence() > constants.SHORTCUT_THRESHOLD: self._mState = constants.eFoundIt return self.get_state() def get_confidence(self): unlike = 0.99 if self._mNumOfMBChar < 6: for i in range(0, self._mNumOfMBChar): unlike = unlike * ONE_CHAR_PROB return 1.0 - unlike else: return unlike