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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2014-present Raymond Hill
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
'use strict';
/******************************************************************************/
// https://bugs.chromium.org/p/v8/issues/detail?id=2869
// orphanizeString is to work around String.slice() potentially causing
// the whole raw filter list to be held in memory just because we cut out
// the title as a substring.
function orphanizeString(s) {
return JSON.parse(JSON.stringify(s));
}
/******************************************************************************/
class LineIterator {
constructor(text, offset) {
this.text = text;
this.textLen = this.text.length;
this.offset = offset || 0;
}
next(offset) {
if ( offset !== undefined ) {
this.offset += offset;
}
let lineEnd = this.text.indexOf('\n', this.offset);
if ( lineEnd === -1 ) {
lineEnd = this.text.indexOf('\r', this.offset);
if ( lineEnd === -1 ) {
lineEnd = this.textLen;
}
}
const line = this.text.slice(this.offset, lineEnd);
this.offset = lineEnd + 1;
return line;
}
peek(n) {
const offset = this.offset;
return this.text.slice(offset, offset + n);
}
charCodeAt(offset) {
return this.text.charCodeAt(this.offset + offset);
}
eot() {
return this.offset >= this.textLen;
}
}
/******************************************************************************/
// The field iterator is less CPU-intensive than when using native
// String.split().
class FieldIterator {
constructor(sep) {
this.text = '';
this.sep = sep;
this.sepLen = sep.length;
this.offset = 0;
}
first(text) {
this.text = text;
this.offset = 0;
return this.next();
}
next() {
let end = this.text.indexOf(this.sep, this.offset);
if ( end === -1 ) {
end = this.text.length;
}
const field = this.text.slice(this.offset, end);
this.offset = end + this.sepLen;
return field;
}
remainder() {
return this.text.slice(this.offset);
}
}
/******************************************************************************/
export {
FieldIterator,
LineIterator,
orphanizeString,
};
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