mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-29 22:27:12 +02:00
50bf999a12
Code review following latest changes. Also, move the input field to the left so that it renders properly on smaller displays and does not jump around when the result position/count numbers change. This also makes it easier to add more functionality to the editor's toolbar in the future.
204 lines
5.6 KiB
JavaScript
204 lines
5.6 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2020-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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(( ) => {
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// >>>>> start of local scope
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/******************************************************************************/
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// Worker context
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if (
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self.WorkerGlobalScope instanceof Object &&
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self instanceof self.WorkerGlobalScope
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) {
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let content = '';
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const doSearch = function(details) {
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const reEOLs = /\n\r|\r\n|\n|\r/g;
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const t1 = Date.now() + 750;
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let reSearch;
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try {
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reSearch = new RegExp(details.pattern, details.flags);
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} catch(ex) {
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return;
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}
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const response = [];
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const maxOffset = content.length;
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let iLine = 0;
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let iOffset = 0;
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let size = 0;
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while ( iOffset < maxOffset ) {
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// Find next match
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const match = reSearch.exec(content);
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if ( match === null ) { break; }
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// Find number of line breaks between last and current match.
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reEOLs.lastIndex = 0;
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const eols = content.slice(iOffset, match.index).match(reEOLs);
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if ( Array.isArray(eols) ) {
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iLine += eols.length;
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}
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// Store line
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response.push(iLine);
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size += 1;
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// Find next line break.
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reEOLs.lastIndex = reSearch.lastIndex;
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const eol = reEOLs.exec(content);
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iOffset = eol !== null
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? reEOLs.lastIndex
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: content.length;
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reSearch.lastIndex = iOffset;
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iLine += 1;
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// Quit if this takes too long
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if ( (size & 0x3FF) === 0 && Date.now() >= t1 ) { break; }
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}
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return response;
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};
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self.onmessage = function(e) {
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const msg = e.data;
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switch ( msg.what ) {
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case 'setHaystack':
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content = msg.content;
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break;
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case 'doSearch':
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const response = doSearch(msg);
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self.postMessage({ id: msg.id, response });
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break;
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}
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};
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return;
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}
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/******************************************************************************/
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// Main context
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{
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const workerTTL = 5 * 60 * 1000;
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const pendingResponses = new Map();
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let worker;
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let workerTTLTimer;
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let messageId = 1;
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const onWorkerMessage = function(e) {
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const msg = e.data;
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const resolver = pendingResponses.get(msg.id);
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if ( resolver === undefined ) { return; }
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pendingResponses.delete(msg.id);
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resolver(msg.response);
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};
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const cancelPendingTasks = function() {
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for ( const resolver of pendingResponses.values() ) {
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resolver();
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}
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pendingResponses.clear();
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};
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const destroy = function() {
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shutdown();
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self.searchThread = undefined;
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};
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const shutdown = function() {
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if ( workerTTLTimer !== undefined ) {
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clearTimeout(workerTTLTimer);
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workerTTLTimer = undefined;
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}
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if ( worker === undefined ) { return; }
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worker.terminate();
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worker.onmessage = undefined;
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worker = undefined;
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cancelPendingTasks();
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};
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const init = function() {
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if ( self.searchThread instanceof Object === false ) { return; }
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if ( worker === undefined ) {
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worker = new Worker('js/codemirror/search-thread.js');
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worker.onmessage = onWorkerMessage;
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}
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if ( workerTTLTimer !== undefined ) {
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clearTimeout(workerTTLTimer);
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}
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workerTTLTimer = vAPI.setTimeout(shutdown, workerTTL);
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};
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const needHaystack = function() {
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return worker instanceof Object === false;
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};
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const setHaystack = function(content) {
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init();
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worker.postMessage({ what: 'setHaystack', content });
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};
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const search = function(query, overwrite = true) {
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init();
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if ( worker instanceof Object === false ) {
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return Promise.resolve();
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}
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if ( overwrite ) {
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cancelPendingTasks();
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}
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const id = messageId++;
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worker.postMessage({
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what: 'doSearch',
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id,
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pattern: query.source,
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flags: query.flags,
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isRE: query instanceof RegExp
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});
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return new Promise(resolve => {
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pendingResponses.set(id, resolve);
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});
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};
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self.addEventListener(
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'beforeunload',
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( ) => { destroy(); },
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{ once: true }
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);
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self.searchThread = { needHaystack, setHaystack, search, shutdown };
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}
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/******************************************************************************/
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// <<<<< end of local scope
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})();
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/******************************************************************************/
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void 0;
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