mirror of
https://github.com/gorhill/uBlock.git
synced 2026-03-11 09:04:36 +00:00
aa7f77aaad
The idea is to remove as many dependencies as possible for low-level ScriptletFilteringEngine in order to make it easier to reuse the module outside uBO itself. The high-level derived class takes care of caching and injection of scriptlets into documents, which requires more knowledge about the environment in which scriptlets are to be used. Also improve scriptlet cache usage to minimize overhead of retrieving scriptlets.
58 lines
1.9 KiB
JavaScript
58 lines
1.9 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a comprehensive, efficient content blocker
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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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export class MRUCache {
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constructor(maxSize) {
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this.maxSize = maxSize;
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this.array = [];
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this.map = new Map();
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this.resetTime = Date.now();
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}
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add(key, value) {
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const found = this.map.has(key);
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this.map.set(key, value);
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if ( found ) { return; }
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if ( this.array.length === this.maxSize ) {
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this.map.delete(this.array.pop());
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}
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this.array.unshift(key);
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}
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remove(key) {
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if ( this.map.delete(key) === false ) { return; }
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this.array.splice(this.array.indexOf(key), 1);
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}
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lookup(key) {
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const value = this.map.get(key);
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if ( value === undefined ) { return; }
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if ( this.array[0] === key ) { return value; }
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const i = this.array.indexOf(key);
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this.array.copyWithin(1, 0, i);
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this.array[0] = key;
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return value;
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}
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reset() {
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this.array = [];
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this.map.clear();
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this.resetTime = Date.now();
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}
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}
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