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cb72211795
Another small step toward the goal of reducing dependency on `µb`. Related issue: - https://github.com/uBlockOrigin/uBlock-issues/issues/1664 text-iterators module has been renamed text-utils to better reflect its content.
108 lines
3.1 KiB
JavaScript
108 lines
3.1 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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'use strict';
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/******************************************************************************/
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// https://bugs.chromium.org/p/v8/issues/detail?id=2869
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// orphanizeString is to work around String.slice() potentially causing
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// the whole raw filter list to be held in memory just because we cut out
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// the title as a substring.
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function orphanizeString(s) {
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return JSON.parse(JSON.stringify(s));
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}
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/******************************************************************************/
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class LineIterator {
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constructor(text, offset) {
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this.text = text;
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this.textLen = this.text.length;
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this.offset = offset || 0;
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}
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next(offset) {
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if ( offset !== undefined ) {
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this.offset += offset;
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}
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let lineEnd = this.text.indexOf('\n', this.offset);
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if ( lineEnd === -1 ) {
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lineEnd = this.text.indexOf('\r', this.offset);
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if ( lineEnd === -1 ) {
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lineEnd = this.textLen;
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}
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}
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const line = this.text.slice(this.offset, lineEnd);
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this.offset = lineEnd + 1;
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return line;
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}
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peek(n) {
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const offset = this.offset;
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return this.text.slice(offset, offset + n);
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}
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charCodeAt(offset) {
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return this.text.charCodeAt(this.offset + offset);
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}
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eot() {
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return this.offset >= this.textLen;
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}
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}
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/******************************************************************************/
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// The field iterator is less CPU-intensive than when using native
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// String.split().
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class FieldIterator {
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constructor(sep) {
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this.text = '';
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this.sep = sep;
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this.sepLen = sep.length;
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this.offset = 0;
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}
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first(text) {
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this.text = text;
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this.offset = 0;
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return this.next();
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}
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next() {
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let end = this.text.indexOf(this.sep, this.offset);
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if ( end === -1 ) {
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end = this.text.length;
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}
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const field = this.text.slice(this.offset, end);
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this.offset = end + this.sepLen;
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return field;
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}
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remainder() {
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return this.text.slice(this.offset);
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}
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}
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/******************************************************************************/
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export {
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FieldIterator,
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LineIterator,
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orphanizeString,
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};
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