mirror of https://github.com/gorhill/uBlock.git
707 lines
21 KiB
JavaScript
707 lines
21 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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/* jshint esversion:11 */
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'use strict';
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/******************************************************************************/
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/// name css-specific-procedural
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/******************************************************************************/
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// Important!
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// Isolate from global scope
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(function() {
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/******************************************************************************/
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// $rulesetId$
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const argsMap = new Map(self.$argsMap$);
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const hostnamesMap = new Map(self.$hostnamesMap$);
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/******************************************************************************/
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const addStylesheet = text => {
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try {
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const sheet = new CSSStyleSheet();
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sheet.replace(`@layer{${text}}`);
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document.adoptedStyleSheets = [
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...document.adoptedStyleSheets,
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sheet
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];
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} catch(ex) {
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}
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};
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const nonVisualElements = {
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script: true,
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style: true,
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};
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// 'P' stands for 'Procedural'
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class PSelectorTask {
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begin() {
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}
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end() {
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}
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}
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class PSelectorVoidTask extends PSelectorTask {
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constructor(task) {
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super();
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console.info(`uBO: :${task[0]}() operator does not exist`);
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}
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transpose() {
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}
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}
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class PSelectorHasTextTask extends PSelectorTask {
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constructor(task) {
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super();
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let arg0 = task[1], arg1;
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if ( Array.isArray(task[1]) ) {
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arg1 = arg0[1]; arg0 = arg0[0];
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}
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this.needle = new RegExp(arg0, arg1);
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}
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transpose(node, output) {
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if ( this.needle.test(node.textContent) ) {
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output.push(node);
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}
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}
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}
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class PSelectorIfTask extends PSelectorTask {
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constructor(task) {
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super();
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this.pselector = new PSelector(task[1]);
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}
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transpose(node, output) {
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if ( this.pselector.test(node) === this.target ) {
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output.push(node);
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}
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}
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}
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PSelectorIfTask.prototype.target = true;
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class PSelectorIfNotTask extends PSelectorIfTask {
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}
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PSelectorIfNotTask.prototype.target = false;
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class PSelectorMatchesCSSTask extends PSelectorTask {
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constructor(task) {
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super();
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this.name = task[1].name;
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this.pseudo = task[1].pseudo ? `::${task[1].pseudo}` : null;
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let arg0 = task[1].value, arg1;
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if ( Array.isArray(arg0) ) {
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arg1 = arg0[1]; arg0 = arg0[0];
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}
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this.value = new RegExp(arg0, arg1);
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}
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transpose(node, output) {
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const style = window.getComputedStyle(node, this.pseudo);
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if ( style !== null && this.value.test(style[this.name]) ) {
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output.push(node);
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}
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}
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}
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class PSelectorMatchesCSSAfterTask extends PSelectorMatchesCSSTask {
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constructor(task) {
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super(task);
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this.pseudo = '::after';
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}
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}
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class PSelectorMatchesCSSBeforeTask extends PSelectorMatchesCSSTask {
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constructor(task) {
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super(task);
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this.pseudo = '::before';
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}
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}
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class PSelectorMatchesMediaTask extends PSelectorTask {
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constructor(task) {
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super();
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this.mql = window.matchMedia(task[1]);
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if ( this.mql.media === 'not all' ) { return; }
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this.mql.addEventListener('change', ( ) => {
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if ( typeof vAPI !== 'object' ) { return; }
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if ( vAPI === null ) { return; }
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const filterer = vAPI.domFilterer && vAPI.domFilterer.proceduralFilterer;
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if ( filterer instanceof Object === false ) { return; }
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filterer.onDOMChanged([ null ]);
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});
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}
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transpose(node, output) {
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if ( this.mql.matches === false ) { return; }
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output.push(node);
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}
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}
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class PSelectorMatchesPathTask extends PSelectorTask {
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constructor(task) {
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super();
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let arg0 = task[1], arg1;
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if ( Array.isArray(task[1]) ) {
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arg1 = arg0[1]; arg0 = arg0[0];
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}
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this.needle = new RegExp(arg0, arg1);
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}
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transpose(node, output) {
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if ( this.needle.test(self.location.pathname + self.location.search) ) {
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output.push(node);
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}
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}
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}
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class PSelectorMinTextLengthTask extends PSelectorTask {
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constructor(task) {
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super();
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this.min = task[1];
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}
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transpose(node, output) {
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if ( node.textContent.length >= this.min ) {
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output.push(node);
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}
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}
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}
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class PSelectorOthersTask extends PSelectorTask {
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constructor() {
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super();
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this.targets = new Set();
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}
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begin() {
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this.targets.clear();
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}
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end(output) {
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const toKeep = new Set(this.targets);
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const toDiscard = new Set();
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const body = document.body;
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let discard = null;
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for ( let keep of this.targets ) {
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while ( keep !== null && keep !== body ) {
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toKeep.add(keep);
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toDiscard.delete(keep);
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discard = keep.previousElementSibling;
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while ( discard !== null ) {
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if (
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nonVisualElements[discard.localName] !== true &&
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toKeep.has(discard) === false
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) {
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toDiscard.add(discard);
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}
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discard = discard.previousElementSibling;
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}
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discard = keep.nextElementSibling;
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while ( discard !== null ) {
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if (
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nonVisualElements[discard.localName] !== true &&
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toKeep.has(discard) === false
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) {
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toDiscard.add(discard);
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}
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discard = discard.nextElementSibling;
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}
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keep = keep.parentElement;
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}
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}
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for ( discard of toDiscard ) {
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output.push(discard);
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}
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this.targets.clear();
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}
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transpose(candidate) {
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for ( const target of this.targets ) {
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if ( target.contains(candidate) ) { return; }
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if ( candidate.contains(target) ) {
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this.targets.delete(target);
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}
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}
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this.targets.add(candidate);
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}
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}
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// https://github.com/AdguardTeam/ExtendedCss/issues/31#issuecomment-302391277
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// Prepend `:scope ` if needed.
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class PSelectorSpathTask extends PSelectorTask {
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constructor(task) {
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super();
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this.spath = task[1];
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this.nth = /^(?:\s*[+~]|:)/.test(this.spath);
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if ( this.nth ) { return; }
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if ( /^\s*>/.test(this.spath) ) {
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this.spath = `:scope ${this.spath.trim()}`;
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}
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}
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qsa(node) {
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if ( this.nth === false ) {
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return node.querySelectorAll(this.spath);
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}
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const parent = node.parentElement;
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if ( parent === null ) { return; }
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let pos = 1;
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for (;;) {
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node = node.previousElementSibling;
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if ( node === null ) { break; }
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pos += 1;
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}
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return parent.querySelectorAll(
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`:scope > :nth-child(${pos})${this.spath}`
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);
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}
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transpose(node, output) {
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const nodes = this.qsa(node);
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if ( nodes === undefined ) { return; }
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for ( const node of nodes ) {
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output.push(node);
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}
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}
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// Helper method for other operators.
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static qsa(node, selector) {
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const parent = node.parentElement;
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if ( parent === null ) { return []; }
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let pos = 1;
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for (;;) {
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node = node.previousElementSibling;
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if ( node === null ) { break; }
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pos += 1;
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}
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return parent.querySelectorAll(
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`:scope > :nth-child(${pos})${selector}`
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);
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}
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}
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class PSelectorUpwardTask extends PSelectorTask {
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constructor(task) {
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super();
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const arg = task[1];
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if ( typeof arg === 'number' ) {
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this.i = arg;
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} else {
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this.s = arg;
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}
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}
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transpose(node, output) {
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if ( this.s !== '' ) {
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const parent = node.parentElement;
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if ( parent === null ) { return; }
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node = parent.closest(this.s);
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if ( node === null ) { return; }
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} else {
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let nth = this.i;
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for (;;) {
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node = node.parentElement;
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if ( node === null ) { return; }
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nth -= 1;
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if ( nth === 0 ) { break; }
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}
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}
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output.push(node);
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}
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}
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PSelectorUpwardTask.prototype.i = 0;
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PSelectorUpwardTask.prototype.s = '';
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class PSelectorWatchAttrs extends PSelectorTask {
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constructor(task) {
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super();
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this.observer = null;
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this.observed = new WeakSet();
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this.observerOptions = {
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attributes: true,
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subtree: true,
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};
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const attrs = task[1];
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if ( Array.isArray(attrs) && attrs.length !== 0 ) {
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this.observerOptions.attributeFilter = task[1];
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}
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}
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// TODO: Is it worth trying to re-apply only the current selector?
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handler() {
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const filterer =
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vAPI.domFilterer && vAPI.domFilterer.proceduralFilterer;
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if ( filterer instanceof Object ) {
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filterer.onDOMChanged([ null ]);
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}
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}
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transpose(node, output) {
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output.push(node);
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if ( this.observed.has(node) ) { return; }
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if ( this.observer === null ) {
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this.observer = new MutationObserver(this.handler);
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}
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this.observer.observe(node, this.observerOptions);
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this.observed.add(node);
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}
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}
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class PSelectorXpathTask extends PSelectorTask {
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constructor(task) {
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super();
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this.xpe = document.createExpression(task[1], null);
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this.xpr = null;
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}
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transpose(node, output) {
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this.xpr = this.xpe.evaluate(
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node,
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XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
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this.xpr
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);
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let j = this.xpr.snapshotLength;
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while ( j-- ) {
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const node = this.xpr.snapshotItem(j);
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if ( node.nodeType === 1 ) {
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output.push(node);
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}
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}
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}
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}
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class PSelector {
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constructor(o) {
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if ( PSelector.prototype.operatorToTaskMap === undefined ) {
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PSelector.prototype.operatorToTaskMap = new Map([
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[ 'has', PSelectorIfTask ],
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[ 'has-text', PSelectorHasTextTask ],
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[ 'if', PSelectorIfTask ],
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[ 'if-not', PSelectorIfNotTask ],
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[ 'matches-css', PSelectorMatchesCSSTask ],
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[ 'matches-css-after', PSelectorMatchesCSSAfterTask ],
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[ 'matches-css-before', PSelectorMatchesCSSBeforeTask ],
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[ 'matches-media', PSelectorMatchesMediaTask ],
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[ 'matches-path', PSelectorMatchesPathTask ],
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[ 'min-text-length', PSelectorMinTextLengthTask ],
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[ 'not', PSelectorIfNotTask ],
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[ 'others', PSelectorOthersTask ],
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[ 'spath', PSelectorSpathTask ],
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[ 'upward', PSelectorUpwardTask ],
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[ 'watch-attr', PSelectorWatchAttrs ],
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[ 'xpath', PSelectorXpathTask ],
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]);
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}
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this.raw = o.raw;
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this.selector = o.selector;
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this.tasks = [];
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const tasks = [];
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if ( Array.isArray(o.tasks) === false ) { return; }
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for ( const task of o.tasks ) {
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const ctor = this.operatorToTaskMap.get(task[0]) || PSelectorVoidTask;
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tasks.push(new ctor(task));
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}
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// Initialize only after all tasks have been successfully instantiated
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this.tasks = tasks;
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}
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prime(input) {
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const root = input || document;
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if ( this.selector === '' ) { return [ root ]; }
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let selector = this.selector;
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if ( input !== document && /^ [>+~]/.test(this.selector) ) {
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return Array.from(PSelectorSpathTask.qsa(input, this.selector));
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}
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const elems = root.querySelectorAll(selector);
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return Array.from(elems);
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}
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exec(input) {
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let nodes = this.prime(input);
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for ( const task of this.tasks ) {
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if ( nodes.length === 0 ) { break; }
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const transposed = [];
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task.begin();
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for ( const node of nodes ) {
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task.transpose(node, transposed);
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}
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task.end(transposed);
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nodes = transposed;
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}
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return nodes;
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}
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test(input) {
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const nodes = this.prime(input);
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for ( const node of nodes ) {
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let output = [ node ];
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for ( const task of this.tasks ) {
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const transposed = [];
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task.begin();
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for ( const node of output ) {
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task.transpose(node, transposed);
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}
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task.end(transposed);
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output = transposed;
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if ( output.length === 0 ) { break; }
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}
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if ( output.length !== 0 ) { return true; }
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}
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return false;
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}
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}
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PSelector.prototype.operatorToTaskMap = undefined;
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class PSelectorRoot extends PSelector {
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constructor(o, styleToken) {
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super(o);
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this.budget = 200; // I arbitrary picked a 1/5 second
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this.raw = o.raw;
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this.cost = 0;
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this.lastAllowanceTime = 0;
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this.styleToken = styleToken;
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}
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prime(input) {
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try {
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return super.prime(input);
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} catch (ex) {
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}
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return [];
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}
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}
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/******************************************************************************/
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class ProceduralFilterer {
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constructor(selectors) {
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this.selectors = [];
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this.masterToken = this.randomToken();
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this.styleTokenMap = new Map();
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this.styledNodes = new Set();
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this.timer = undefined;
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this.addSelectors(selectors);
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}
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addSelectors() {
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for ( const selector of selectors ) {
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let style, styleToken;
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if ( selector.action === undefined ) {
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style = 'display:none!important;';
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} else if ( selector.action[0] === 'style' ) {
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style = selector.action[1];
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}
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if ( style !== undefined ) {
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styleToken = this.styleTokenFromStyle(style);
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}
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const pselector = new PSelectorRoot(selector, styleToken);
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this.selectors.push(pselector);
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}
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this.onDOMChanged();
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}
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commitNow() {
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//console.time('procedural selectors/dom layout changed');
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// https://github.com/uBlockOrigin/uBlock-issues/issues/341
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// Be ready to unhide nodes which no longer matches any of
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// the procedural selectors.
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const toUnstyle = this.styledNodes;
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this.styledNodes = new Set();
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let t0 = Date.now();
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for ( const pselector of this.selectors.values() ) {
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const allowance = Math.floor((t0 - pselector.lastAllowanceTime) / 2000);
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if ( allowance >= 1 ) {
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pselector.budget += allowance * 50;
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if ( pselector.budget > 200 ) { pselector.budget = 200; }
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pselector.lastAllowanceTime = t0;
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}
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if ( pselector.budget <= 0 ) { continue; }
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const nodes = pselector.exec();
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const t1 = Date.now();
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pselector.budget += t0 - t1;
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if ( pselector.budget < -500 ) {
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console.info('uBOL: disabling %s', pselector.raw);
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pselector.budget = -0x7FFFFFFF;
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}
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t0 = t1;
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if ( nodes.length === 0 ) { continue; }
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this.styleNodes(nodes, pselector.styleToken);
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}
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this.unstyleNodes(toUnstyle);
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}
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styleTokenFromStyle(style) {
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if ( style === undefined ) { return; }
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let styleToken = this.styleTokenMap.get(style);
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if ( styleToken !== undefined ) { return styleToken; }
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styleToken = this.randomToken();
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this.styleTokenMap.set(style, styleToken);
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addStylesheet(
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`[${this.masterToken}][${styleToken}]\n{${style}}\n`,
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);
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return styleToken;
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}
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|
|
styleNodes(nodes, styleToken) {
|
|
if ( styleToken === undefined ) {
|
|
for ( const node of nodes ) {
|
|
node.textContent = '';
|
|
node.remove();
|
|
}
|
|
return;
|
|
}
|
|
for ( const node of nodes ) {
|
|
node.setAttribute(this.masterToken, '');
|
|
node.setAttribute(styleToken, '');
|
|
this.styledNodes.add(node);
|
|
}
|
|
}
|
|
|
|
unstyleNodes(nodes) {
|
|
for ( const node of nodes ) {
|
|
if ( this.styledNodes.has(node) ) { continue; }
|
|
node.removeAttribute(this.masterToken);
|
|
}
|
|
}
|
|
|
|
randomToken() {
|
|
const n = Math.random();
|
|
return String.fromCharCode(n * 25 + 97) +
|
|
Math.floor(
|
|
(0.25 + n * 0.75) * Number.MAX_SAFE_INTEGER
|
|
).toString(36).slice(-8);
|
|
}
|
|
|
|
onDOMChanged() {
|
|
if ( this.timer !== undefined ) { return; }
|
|
this.timer = self.requestAnimationFrame(( ) => {
|
|
this.timer = undefined;
|
|
this.commitNow();
|
|
});
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
let hn;
|
|
try { hn = document.location.hostname; } catch(ex) { }
|
|
const selectors = [];
|
|
while ( hn ) {
|
|
if ( hostnamesMap.has(hn) ) {
|
|
let argsHashes = hostnamesMap.get(hn);
|
|
if ( typeof argsHashes === 'number' ) { argsHashes = [ argsHashes ]; }
|
|
for ( const argsHash of argsHashes ) {
|
|
const details = argsMap.get(argsHash);
|
|
if ( details.n && details.n.includes(hn) ) { continue; }
|
|
selectors.push(...details.a);
|
|
}
|
|
}
|
|
if ( hn === '*' ) { break; }
|
|
const pos = hn.indexOf('.');
|
|
if ( pos !== -1 ) {
|
|
hn = hn.slice(pos + 1);
|
|
} else {
|
|
hn = '*';
|
|
}
|
|
}
|
|
|
|
const proceduralSelectors = [];
|
|
const styleSelectors = [];
|
|
for ( const selector of selectors ) {
|
|
if ( selector.cssable ) {
|
|
styleSelectors.push(selector);
|
|
} else {
|
|
proceduralSelectors.push(selector);
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
// Declarative selectors
|
|
|
|
if ( styleSelectors.length !== 0 ) {
|
|
const cssRuleFromProcedural = details => {
|
|
const { tasks, action } = details;
|
|
let mq;
|
|
if ( tasks !== undefined ) {
|
|
if ( tasks.length > 1 ) { return; }
|
|
if ( tasks[0][0] !== 'matches-media' ) { return; }
|
|
mq = tasks[0][1];
|
|
}
|
|
let style;
|
|
if ( Array.isArray(action) ) {
|
|
if ( action[0] !== 'style' ) { return; }
|
|
style = action[1];
|
|
}
|
|
if ( mq === undefined && style === undefined ) { return; }
|
|
if ( mq === undefined ) {
|
|
return `${details.selector}\n{${style}}`;
|
|
}
|
|
if ( style === undefined ) {
|
|
return `@media ${mq} {\n${details.selector}\n{display:none!important;}\n}`;
|
|
}
|
|
return `@media ${mq} {\n${details.selector}\n{${style}}\n}`;
|
|
};
|
|
const sheetText = [];
|
|
for ( const selector of styleSelectors ) {
|
|
const ruleText = cssRuleFromProcedural(selector);
|
|
if ( ruleText === undefined ) { continue; }
|
|
sheetText.push(ruleText);
|
|
}
|
|
if ( sheetText.length !== 0 ) {
|
|
addStylesheet(sheetText.join('\n'));
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
// Procedural selectors
|
|
|
|
if ( proceduralSelectors.length !== 0 ) {
|
|
const filterer = new ProceduralFilterer(proceduralSelectors);
|
|
const observer = new MutationObserver(mutations => {
|
|
let domChanged = false;
|
|
for ( let i = 0; i < mutations.length && !domChanged; i++ ) {
|
|
const mutation = mutations[i];
|
|
for ( const added of mutation.addedNodes ) {
|
|
if ( added.nodeType !== 1 ) { continue; }
|
|
domChanged = true;
|
|
}
|
|
for ( const removed of mutation.removedNodes ) {
|
|
if ( removed.nodeType !== 1 ) { continue; }
|
|
domChanged = true;
|
|
}
|
|
}
|
|
if ( domChanged === false ) { return; }
|
|
filterer.onDOMChanged();
|
|
});
|
|
observer.observe(document, {
|
|
childList: true,
|
|
subtree: true,
|
|
});
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
argsMap.clear();
|
|
hostnamesMap.clear();
|
|
|
|
/******************************************************************************/
|
|
|
|
})();
|
|
|
|
/******************************************************************************/
|