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166 lines
6.0 KiB
166 lines
6.0 KiB
/*
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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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!function(jschardet) {
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(function() {
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var UDF = 0; // undefined
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var OTH = 1; // other
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jschardet.OTH = 1;
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var ASC = 2; // ascii capital letter
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var ASS = 3; // ascii small letter
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var ACV = 4; // accent capital vowel
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var ACO = 5; // accent capital other
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var ASV = 6; // accent small vowel
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var ASO = 7; // accent small other
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jschardet.Latin1_CharToClass = [
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 00 - 07
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 08 - 0F
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 10 - 17
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 18 - 1F
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 20 - 27
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 28 - 2F
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 30 - 37
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 38 - 3F
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OTH, ASC, ASC, ASC, ASC, ASC, ASC, ASC, // 40 - 47
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ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, // 48 - 4F
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ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, // 50 - 57
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ASC, ASC, ASC, OTH, OTH, OTH, OTH, OTH, // 58 - 5F
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OTH, ASS, ASS, ASS, ASS, ASS, ASS, ASS, // 60 - 67
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ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, // 68 - 6F
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ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, // 70 - 77
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ASS, ASS, ASS, OTH, OTH, OTH, OTH, OTH, // 78 - 7F
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OTH, UDF, OTH, ASO, OTH, OTH, OTH, OTH, // 80 - 87
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OTH, OTH, ACO, OTH, ACO, UDF, ACO, UDF, // 88 - 8F
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UDF, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // 90 - 97
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OTH, OTH, ASO, OTH, ASO, UDF, ASO, ACO, // 98 - 9F
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // A0 - A7
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // A8 - AF
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // B0 - B7
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, // B8 - BF
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ACV, ACV, ACV, ACV, ACV, ACV, ACO, ACO, // C0 - C7
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ACV, ACV, ACV, ACV, ACV, ACV, ACV, ACV, // C8 - CF
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ACO, ACO, ACV, ACV, ACV, ACV, ACV, OTH, // D0 - D7
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ACV, ACV, ACV, ACV, ACV, ACO, ACO, ACO, // D8 - DF
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ASV, ASV, ASV, ASV, ASV, ASV, ASO, ASO, // E0 - E7
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ASV, ASV, ASV, ASV, ASV, ASV, ASV, ASV, // E8 - EF
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ASO, ASO, ASV, ASV, ASV, ASV, ASV, OTH, // F0 - F7
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ASV, ASV, ASV, ASV, ASV, ASO, ASO, ASO // F8 - FF
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];
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// 0 : illegal
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// 1 : very unlikely
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// 2 : normal
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// 3 : very likely
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jschardet.Latin1ClassModel = [
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// UDF OTH ASC ASS ACV ACO ASV ASO
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0, 0, 0, 0, 0, 0, 0, 0, // UDF
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0, 3, 3, 3, 3, 3, 3, 3, // OTH
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0, 3, 3, 3, 3, 3, 3, 3, // ASC
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0, 3, 3, 3, 1, 1, 3, 3, // ASS
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0, 3, 3, 3, 1, 2, 1, 2, // ACV
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0, 3, 3, 3, 3, 3, 3, 3, // ACO
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0, 3, 1, 3, 1, 1, 1, 3, // ASV
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0, 3, 1, 3, 1, 1, 3, 3 // ASO
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];
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})();
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jschardet.Latin1Prober = function() {
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jschardet.CharSetProber.apply(this);
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var FREQ_CAT_NUM = 4;
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var CLASS_NUM = 8; // total classes
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var self = this;
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function init() {
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self.reset();
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}
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this.reset = function() {
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this._mLastCharClass = jschardet.OTH;
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this._mFreqCounter = [];
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for( var i = 0; i < FREQ_CAT_NUM; this._mFreqCounter[i++] = 0 );
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jschardet.Latin1Prober.prototype.reset.apply(this);
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}
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this.getCharsetName = function() {
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return "windows-1252";
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}
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this.feed = function(aBuf) {
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aBuf = this.filterWithEnglishLetters(aBuf);
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for( var i = 0; i < aBuf.length; i++ ) {
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var c = aBuf.charCodeAt(i);
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var charClass = jschardet.Latin1_CharToClass[c];
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var freq = jschardet.Latin1ClassModel[(this._mLastCharClass * CLASS_NUM) + charClass];
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if( freq == 0 ) {
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this._mState = jschardet.Constants.notMe;
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break;
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}
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this._mFreqCounter[freq]++;
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this._mLastCharClass = charClass;
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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 confidence;
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var constants;
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if( this.getState() == jschardet.Constants.notMe ) {
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return 0.01;
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}
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var total = 0;
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for( var i = 0; i < this._mFreqCounter.length; i++ ) {
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total += this._mFreqCounter[i];
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}
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if( total < 0.01 ) {
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constants = 0.0;
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} else {
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confidence = (this._mFreqCounter[3] / total) - (this._mFreqCounter[1] * 20 / total);
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}
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if( confidence < 0 ) {
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confidence = 0.0;
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}
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// lower the confidence of latin1 so that other more accurate detector
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// can take priority.
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//
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// antonio.afonso: need to change this otherwise languages like pt, es, fr using latin1 will never be detected.
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confidence = confidence * 0.95;
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return confidence;
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}
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init();
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}
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jschardet.Latin1Prober.prototype = new jschardet.CharSetProber();
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}(require('./init'));
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