JezK
Edit File: sjisprober.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 class SJISProber < MultiByteCharSetProber def initialize super() @codingSM = CodingStateMachine.new(SJISSMModel) @distributionAnalyzer = SJISDistributionAnalysis.new() @contextAnalyzer = SJISContextAnalysis.new() reset() end def reset super() @contextAnalyzer.reset() end def get_charset_name return "SHIFT_JIS" end def feed(aBuf) aLen = aBuf.length for i in (0...aLen) codingState = @codingSM.next_state(aBuf[i,1]) if codingState == EError $stderr << "#{get_charset_name} prober hit error at byte #{i}\n" if $debug @state = ENotMe break elsif codingState == EItsMe @state = EFoundIt break elsif codingState == EStart charLen = @codingSM.get_current_charlen() if i == 0 @lastChar[1] = aBuf[0, 1] @contextAnalyzer.feed(@lastChar[2-charLen, 1], charLen) @distributionAnalyzer.feed(@lastChar, charLen) else @contextAnalyzer.feed(aBuf[i+1-charLen, 2], charLen) @distributionAnalyzer.feed(aBuf[i-1, 2], charLen) end end end @lastChar[0] = aBuf[aLen-1, 1] if get_state() == EDetecting if @contextAnalyzer.got_enough_data() and (get_confidence() > SHORTCUT_THRESHOLD) @state = EFoundIt end end return get_state() end def get_confidence l = [@contextAnalyzer.get_confidence(), @distributionAnalyzer.get_confidence()] return l.max end end end