120 lines
3.9 KiB
JavaScript
120 lines
3.9 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 constants = require('./constants');
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var CharSetProber = require('./charsetprober');
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var logger = require('./logger');
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function CharSetGroupProber() {
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CharSetProber.apply(this);
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var self = this;
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function init() {
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self._mActiveNum = 0;
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self._mProbers = [];
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self._mBestGuessProber = null;
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}
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this.reset = function() {
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CharSetGroupProber.prototype.reset.apply(this);
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this._mActiveNum = 0;
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for( var i = 0, prober; prober = this._mProbers[i]; i++ ) {
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if( prober ) {
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prober.reset();
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prober.active = true;
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this._mActiveNum++;
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}
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}
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this._mBestGuessProber = null;
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}
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this.getCharsetName = function() {
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if( !this._mBestGuessProber ) {
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this.getConfidence();
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if( !this._mBestGuessProber ) return null;
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}
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return this._mBestGuessProber.getCharsetName();
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}
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this.getSupportedCharsetNames = function() {
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throw new Error("Unimplemented method getSupportedCharsetNames()");
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}
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this.feed = function(aBuf) {
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for( var i = 0, prober; prober = this._mProbers[i]; i++ ) {
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if( !prober || !prober.active ) continue;
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var st = prober.feed(aBuf);
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if( !st ) continue;
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if( st == constants.foundIt ) {
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this._mBestGuessProber = prober;
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return this.getState();
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} else if( st == constants.notMe ) {
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prober.active = false;
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this._mActiveNum--;
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if( this._mActiveNum <= 0 ) {
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this._mState = constants.notMe;
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return this.getState();
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}
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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 st = this.getState();
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if( st == constants.foundIt ) {
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return 0.99;
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} else if( st == constants.notMe ) {
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return 0.01;
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}
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var bestConf = 0.0;
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this._mBestGuessProber = null;
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for( var i = 0, prober; prober = this._mProbers[i]; i++ ) {
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if( !prober ) continue;
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if( !prober.active ) {
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logger.log(prober.getCharsetName() + " not active\n");
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continue;
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}
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var cf = prober.getConfidence();
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logger.log(prober.getCharsetName() + " confidence = " + cf + "\n");
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if( bestConf < cf ) {
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bestConf = cf;
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this._mBestGuessProber = prober;
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}
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}
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if( !this._mBestGuessProber ) return 0.0;
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return bestConf;
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}
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init();
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}
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CharSetGroupProber.prototype = new CharSetProber();
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module.exports = CharSetGroupProber
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