99 lines
3 KiB
JavaScript
99 lines
3 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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function CharSetProber() {
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this.reset = function() {
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this._mState = constants.detecting;
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}
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this.getCharsetName = function() {
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return null;
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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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}
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this.getState = function() {
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return this._mState;
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}
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this.getConfidence = function() {
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return 0.0;
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}
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this.filterHighBitOnly = function(aBuf) {
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aBuf = aBuf.replace(/[\x00-\x7F]+/g, " ");
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return aBuf;
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}
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this.filterWithoutEnglishLetters = function(aBuf) {
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aBuf = aBuf.replace(/[A-Za-z]+/g, " ");
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return aBuf;
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}
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// Returns a copy of aBuf that retains only the sequences of English
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// alphabet and high byte characters that are not between <> characters.
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// The exception are PHP tags which start with '<?' and end with '?>'.
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// This filter can be applied to all scripts which contain both English
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// characters and extended ASCII characters, but is currently only used by
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// Latin1Prober.
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this.removeXmlTags = function(aBuf) {
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var result = '';
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var inTag = false;
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var prev = 0;
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for (var curr = 0; curr < aBuf.length; curr++) {
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var c = aBuf[curr];
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if (c == '>' && aBuf[curr-1] !== '?') {
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prev = curr + 1
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inTag = false;
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} else if (c == '<' && aBuf[curr+1] !== '?') {
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if (curr > prev && !inTag) {
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result = result + aBuf.substring(prev, curr) + ' ';
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}
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inTag = true;
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}
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}
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if (!inTag) {
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result = result + aBuf.substring(prev);
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}
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return result;
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}
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}
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module.exports = CharSetProber
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