JezK
Edit File: utf8prober.rb
######################## 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): # Jeff Hodges - port to Ruby # 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 ######################### module CharDet ONE_CHAR_PROB = 0.5 class UTF8Prober < CharSetProber def initialize super() @codingSM = CodingStateMachine.new(UTF8SMModel) reset() end def reset super() @codingSM.reset() @numOfMBChar = 0 end def get_charset_name return "utf-8" end def feed(aBuf) aBuf.each_byte do |b| c = b.chr codingState = @codingSM.next_state(c) if codingState == EError @state = ENotMe break elsif codingState == EItsMe @state = EFoundIt break elsif codingState == EStart if @codingSM.get_current_charlen() >= 2 @numOfMBChar += 1 end end end if get_state() == EDetecting if get_confidence() > SHORTCUT_THRESHOLD @state = EFoundIt end end return get_state() end def get_confidence unlike = 0.99 if @numOfMBChar < 6 for i in (0...@numOfMBChar) unlike = unlike * ONE_CHAR_PROB end return 1.0 - unlike else return unlike end end end end