mirror of
https://github.com/fofolee/uTools-quickcommand.git
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107 lines
3.8 KiB
JavaScript
107 lines
3.8 KiB
JavaScript
/*
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* The Original Code is Mozilla Universal charset detector 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) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* António Afonso (antonio.afonso gmail.com) - port to JavaScript
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* Mark Pilgrim - port to Python
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* Shy Shalom - original C code
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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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*/
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var CodingStateMachine = require('./codingstatemachine');
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var MultiByteCharSetProber = require('./mbcharsetprober');
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var EUCJPDistributionAnalysis = require('./chardistribution').EUCJPDistributionAnalysis;
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var EUCJPContextAnalysis = require('./jpcntx').EUCJPContextAnalysis;
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var EUCJPSMModel = require('./mbcssm/eucjp');
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var constants = require('./constants');
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var logger = require('./logger');
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function EUCJPProber() {
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MultiByteCharSetProber.apply(this);
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var self = this;
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function init() {
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self._mCodingSM = new CodingStateMachine(EUCJPSMModel);
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self._mDistributionAnalyzer = new EUCJPDistributionAnalysis();
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self._mContextAnalyzer = new EUCJPContextAnalysis();
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self.reset();
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}
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this.reset = function() {
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EUCJPProber.prototype.reset.apply(this);
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this._mContextAnalyzer.reset();
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}
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this.getCharsetName = function() {
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return "EUC-JP";
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}
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this.feed = function(aBuf) {
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var aLen = aBuf.length;
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for( var i = 0; i < aLen; i++ ) {
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var codingState = this._mCodingSM.nextState(aBuf[i]);
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if( codingState == constants.error ) {
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logger.log(this.getCharsetName() + " prober hit error at byte " + i + "\n");
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this._mState = constants.notMe;
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break;
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} else if( codingState == constants.itsMe ) {
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this._mState = constants.foundIt;
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break;
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} else if( codingState == constants.start ) {
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var charLen = this._mCodingSM.getCurrentCharLen();
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if( i == 0 ) {
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this._mLastChar[1] = aBuf[0];
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this._mContextAnalyzer.feed(this._mLastChar, charLen);
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this._mDistributionAnalyzer.feed(this._mLastChar, charLen);
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} else {
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this._mContextAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
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this._mDistributionAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
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}
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}
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}
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this._mLastChar[0] = aBuf[aLen - 1];
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if( this.getState() == constants.detecting ) {
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if( this._mContextAnalyzer.gotEnoughData() &&
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this.getConfidence() > constants.SHORTCUT_THRESHOLD ) {
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this._mState = constants.foundIt;
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}
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}
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return this.getState();
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}
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this.getConfidence = function() {
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var contxtCf = this._mContextAnalyzer.getConfidence();
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var distribCf = this._mDistributionAnalyzer.getConfidence();
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return Math.max(contxtCf, distribCf);
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}
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init();
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}
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EUCJPProber.prototype = new MultiByteCharSetProber();
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module.exports = EUCJPProber
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