mirror of
https://github.com/gorhill/uBlock.git
synced 2026-03-11 09:04:36 +00:00
821 lines
25 KiB
JavaScript
821 lines
25 KiB
JavaScript
/*******************************************************************************
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uBlock Origin Lite - a comprehensive, MV3-compliant 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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// Important!
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// Isolate from global scope
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(function uBOL_cssProceduralAPI() {
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if ( self.ProceduralFiltererAPI !== undefined ) {
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if ( self.ProceduralFiltererAPI instanceof Promise === false ) { return; }
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}
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/******************************************************************************/
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const uBOL_injectCSS = css => {
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chrome.runtime.sendMessage({
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what: 'insertCSS',
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css,
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}).catch(( ) => {
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});
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};
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const nonVisualElements = {
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head: true,
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link: true,
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meta: true,
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script: true,
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style: true,
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};
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const regexFromString = (s, exact = false) => {
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if ( s === '' ) { return /^/; }
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const match = /^\/(.+)\/([imu]*)$/.exec(s);
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if ( match !== null ) {
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return new RegExp(match[1], match[2] || undefined);
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}
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const reStr = s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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return new RegExp(exact ? `^${reStr}$` : reStr);
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};
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const randomToken = ( ) => {
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const n = Math.random();
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return String.fromCharCode(n * 25 + 97) +
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Math.floor(
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(0.25 + n * 0.75) * Number.MAX_SAFE_INTEGER
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).toString(36).slice(-8);
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};
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/******************************************************************************/
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// 'P' stands for 'Procedural'
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class PSelectorTask {
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destructor() {
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}
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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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/******************************************************************************/
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class PSelectorVoidTask extends PSelectorTask {
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constructor(filterer, 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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/******************************************************************************/
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class PSelectorHasTextTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.needle = regexFromString(task[1]);
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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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/******************************************************************************/
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class PSelectorIfTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.pselector = new PSelector(filterer, 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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target = true;
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}
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class PSelectorIfNotTask extends PSelectorIfTask {
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target = false;
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}
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/******************************************************************************/
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class PSelectorMatchesAttrTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.reAttr = regexFromString(task[1].attr, true);
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this.reValue = regexFromString(task[1].value, true);
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}
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transpose(node, output) {
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if ( typeof node.getAttributeNames !== 'function' ) { return; }
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const attrs = node.getAttributeNames();
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for ( const attr of attrs ) {
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if ( this.reAttr.test(attr) === false ) { continue; }
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if ( this.reValue.test(node.getAttribute(attr)) === false ) { continue; }
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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 PSelectorMatchesCSSTask extends PSelectorTask {
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constructor(filterer, 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(filterer, task) {
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super(filterer, 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(filterer, task) {
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super(filterer, task);
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this.pseudo = '::before';
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}
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}
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/******************************************************************************/
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class PSelectorMatchesMediaTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.filterer = filterer;
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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.boundHandler = this.handler.bind(this);
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this.mql.addEventListener('change', this.boundHandler);
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}
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destructor() {
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super.destructor();
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this.mql.removeEventListener('change', this.boundHandler);
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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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handler() {
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if ( this.filterer instanceof Object === false ) { return; }
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this.filterer.uBOL_DOMChanged();
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}
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}
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/******************************************************************************/
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class PSelectorMatchesPathTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.needle = regexFromString(
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task[1].replace(/\P{ASCII}/gu, s => encodeURIComponent(s))
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);
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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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/******************************************************************************/
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class PSelectorMatchesPropTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.props = task[1].attr.split('.');
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this.reValue = task[1].value !== ''
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? regexFromString(task[1].value, true)
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: null;
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}
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transpose(node, output) {
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let value = node;
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for ( const prop of this.props ) {
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if ( value === undefined ) { return; }
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if ( value === null ) { return; }
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value = value[prop];
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}
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if ( this.reValue === null ) {
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if ( value === undefined ) { return; }
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} else if ( this.reValue.test(value) === false ) {
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return;
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}
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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(filterer, 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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/******************************************************************************/
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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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const head = document.head;
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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 && keep !== head ) {
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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 ( nonVisualElements[discard.localName] !== true ) {
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if ( toKeep.has(discard) === false ) {
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toDiscard.add(discard);
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}
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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 ( nonVisualElements[discard.localName] !== true ) {
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if ( toKeep.has(discard) === false ) {
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toDiscard.add(discard);
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}
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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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/******************************************************************************/
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class PSelectorShadowTask extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.selector = task[1];
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}
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transpose(node, output) {
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const root = this.openOrClosedShadowRoot(node);
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if ( root === null ) { return; }
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const nodes = root.querySelectorAll(this.selector);
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output.push(...nodes);
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}
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get openOrClosedShadowRoot() {
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if ( PSelectorShadowTask.openOrClosedShadowRoot !== undefined ) {
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return PSelectorShadowTask.openOrClosedShadowRoot;
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}
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if ( typeof chrome === 'object' && chrome !== null ) {
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if ( chrome.dom instanceof Object ) {
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if ( typeof chrome.dom.openOrClosedShadowRoot === 'function' ) {
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PSelectorShadowTask.openOrClosedShadowRoot =
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chrome.dom.openOrClosedShadowRoot;
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return PSelectorShadowTask.openOrClosedShadowRoot;
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}
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}
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}
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PSelectorShadowTask.openOrClosedShadowRoot = node =>
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node.openOrClosedShadowRoot || null;
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return PSelectorShadowTask.openOrClosedShadowRoot;
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}
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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(filterer, 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 ${this.spath.trim()}`;
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}
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}
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transpose(node, output) {
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const nodes = this.nth
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? PSelectorSpathTask.qsa(node, this.spath)
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: node.querySelectorAll(this.spath);
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for ( const node of nodes ) {
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output.push(node);
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}
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}
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// Helper method for other operators.
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static qsa(node, selector) {
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const parent = node.parentElement;
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if ( parent === null ) { return []; }
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let pos = 1;
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for (;;) {
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node = node.previousElementSibling;
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if ( node === null ) { break; }
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pos += 1;
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}
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return parent.querySelectorAll(
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`:scope > :nth-child(${pos})${selector}`
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);
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}
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}
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/******************************************************************************/
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class PSelectorUpwardTask extends PSelectorTask {
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constructor(filterer, 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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i = 0;
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s = '';
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}
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/******************************************************************************/
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class PSelectorWatchAttrs extends PSelectorTask {
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constructor(filterer, task) {
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super();
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this.filterer = filterer;
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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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destructor() {
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super.destructor();
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if ( this.observer ) {
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this.observer.takeRecords();
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this.observer.disconnect();
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this.observer = 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.filterer instanceof Object === false ) { return; }
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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(( ) => {
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this.filterer.uBOL_DOMChanged();
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});
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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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/******************************************************************************/
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class PSelectorXpathTask extends PSelectorTask {
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constructor(filterer, 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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/******************************************************************************/
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class PSelector {
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constructor(filterer, o) {
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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 = PSelector.operatorToTaskMap.get(task[0]) || PSelectorVoidTask;
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tasks.push(new ctor(filterer, task));
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}
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this.tasks = tasks;
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}
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destructor() {
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for ( const task of this.tasks ) {
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task.destructor();
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}
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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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if ( input !== document ) {
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const c0 = this.selector.charCodeAt(0);
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if ( c0 === 0x2B /* + */ || c0 === 0x7E /* ~ */ ) {
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return Array.from(PSelectorSpathTask.qsa(input, this.selector));
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} else if ( c0 === 0x3E /* > */ ) {
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return Array.from(input.querySelectorAll(`:scope ${this.selector}`));
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}
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}
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return Array.from(root.querySelectorAll(this.selector));
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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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static 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-attr', PSelectorMatchesAttrTask ],
|
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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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[ 'matches-prop', PSelectorMatchesPropTask ],
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[ 'min-text-length', PSelectorMinTextLengthTask ],
|
|
[ 'not', PSelectorIfNotTask ],
|
|
[ 'others', PSelectorOthersTask ],
|
|
[ 'shadow', PSelectorShadowTask ],
|
|
[ 'spath', PSelectorSpathTask ],
|
|
[ 'upward', PSelectorUpwardTask ],
|
|
[ 'watch-attr', PSelectorWatchAttrs ],
|
|
[ 'xpath', PSelectorXpathTask ],
|
|
]);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
class PSelectorRoot extends PSelector {
|
|
constructor(filterer, o) {
|
|
super(filterer, o);
|
|
this.budget = 200; // I arbitrary picked a 1/5 second
|
|
this.raw = o.raw;
|
|
this.cost = 0;
|
|
this.lastAllowanceTime = 0;
|
|
this.action = o.action;
|
|
}
|
|
prime(input) {
|
|
try {
|
|
return super.prime(input);
|
|
} catch {
|
|
}
|
|
return [];
|
|
}
|
|
exec(input) {
|
|
try {
|
|
return super.exec(input);
|
|
} catch {
|
|
}
|
|
return [];
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
class ProceduralFilterer {
|
|
constructor() {
|
|
this.selectors = [];
|
|
this.styleTokenMap = new Map();
|
|
this.styledNodes = new Set();
|
|
this.timer = undefined;
|
|
this.hideStyle = 'display:none!important;';
|
|
}
|
|
|
|
async reset() {
|
|
if ( this.timer ) {
|
|
self.cancelAnimationFrame(this.timer);
|
|
this.timer = undefined;
|
|
}
|
|
for ( const pselector of this.selectors.values() ) {
|
|
pselector.destructor();
|
|
}
|
|
this.selectors.length = 0;
|
|
const promises = [];
|
|
for ( const [ style, token ] of this.styleTokenMap ) {
|
|
for ( const elem of this.styledNodes ) {
|
|
elem.removeAttribute(token);
|
|
}
|
|
const css = `[${token}]\n{${style}}\n`;
|
|
promises.push(
|
|
chrome.runtime.sendMessage({ what: 'removeCSS', css }).catch(( ) => { })
|
|
);
|
|
}
|
|
this.styleTokenMap.clear();
|
|
this.styledNodes.clear();
|
|
return Promise.all(promises);
|
|
}
|
|
|
|
addSelectors(selectors) {
|
|
for ( const selector of selectors ) {
|
|
const pselector = new PSelectorRoot(this, selector);
|
|
this.primeProceduralSelector(pselector);
|
|
this.selectors.push(pselector);
|
|
}
|
|
}
|
|
|
|
// This allows to perform potentially expensive initialization steps
|
|
// before the filters are ready to be applied.
|
|
primeProceduralSelector(pselector) {
|
|
if ( pselector.action === undefined ) {
|
|
this.styleTokenFromStyle(this.hideStyle);
|
|
} else if ( pselector.action[0] === 'style' ) {
|
|
this.styleTokenFromStyle(pselector.action[1]);
|
|
}
|
|
return pselector;
|
|
}
|
|
|
|
uBOL_commit() {
|
|
if ( this.timer !== undefined ) {
|
|
self.cancelAnimationFrame(this.timer);
|
|
this.timer = undefined;
|
|
}
|
|
|
|
// https://github.com/uBlockOrigin/uBlock-issues/issues/341
|
|
// Be ready to unhide nodes which no longer matches any of
|
|
// the procedural selectors.
|
|
const toUnstyle = this.styledNodes;
|
|
this.styledNodes = new Set();
|
|
|
|
let t0 = Date.now();
|
|
|
|
for ( const pselector of this.selectors.values() ) {
|
|
const allowance = Math.floor((t0 - pselector.lastAllowanceTime) / 2000);
|
|
if ( allowance >= 1 ) {
|
|
pselector.budget += allowance * 50;
|
|
if ( pselector.budget > 200 ) { pselector.budget = 200; }
|
|
pselector.lastAllowanceTime = t0;
|
|
}
|
|
if ( pselector.budget <= 0 ) { continue; }
|
|
const nodes = pselector.exec();
|
|
const t1 = Date.now();
|
|
pselector.budget += t0 - t1;
|
|
if ( pselector.budget < -500 ) {
|
|
console.info('uBOL: disabling %s', pselector.raw);
|
|
pselector.budget = -0x7FFFFFFF;
|
|
}
|
|
t0 = t1;
|
|
if ( nodes.length === 0 ) { continue; }
|
|
this.processNodes(nodes, pselector.action);
|
|
}
|
|
|
|
this.unprocessNodes(toUnstyle);
|
|
}
|
|
|
|
styleTokenFromStyle(style) {
|
|
if ( style === undefined ) { return; }
|
|
let styleToken = this.styleTokenMap.get(style);
|
|
if ( styleToken !== undefined ) { return styleToken; }
|
|
styleToken = randomToken();
|
|
this.styleTokenMap.set(style, styleToken);
|
|
uBOL_injectCSS(`[${styleToken}]\n{${style}}\n`);
|
|
return styleToken;
|
|
}
|
|
|
|
processNodes(nodes, action) {
|
|
const op = action && action[0] || '';
|
|
const arg = op !== '' ? action[1] : '';
|
|
switch ( op ) {
|
|
case '':
|
|
/* fall through */
|
|
case 'style': {
|
|
const styleToken = this.styleTokenFromStyle(
|
|
arg === '' ? this.hideStyle : arg
|
|
);
|
|
for ( const node of nodes ) {
|
|
node.setAttribute(styleToken, '');
|
|
this.styledNodes.add(node);
|
|
}
|
|
break;
|
|
}
|
|
case 'remove': {
|
|
for ( const node of nodes ) {
|
|
node.remove();
|
|
node.textContent = '';
|
|
}
|
|
break;
|
|
}
|
|
case 'remove-attr': {
|
|
const reAttr = regexFromString(arg, true);
|
|
for ( const node of nodes ) {
|
|
for ( const name of node.getAttributeNames() ) {
|
|
if ( reAttr.test(name) === false ) { continue; }
|
|
node.removeAttribute(name);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 'remove-class': {
|
|
const reClass = regexFromString(arg, true);
|
|
for ( const node of nodes ) {
|
|
const cl = node.classList;
|
|
for ( const name of cl.values() ) {
|
|
if ( reClass.test(name) === false ) { continue; }
|
|
cl.remove(name);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
unprocessNodes(nodes) {
|
|
const tokens = Array.from(this.styleTokenMap.values());
|
|
for ( const node of nodes ) {
|
|
if ( this.styledNodes.has(node) ) { continue; }
|
|
for ( const token of tokens ) {
|
|
node.removeAttribute(token);
|
|
}
|
|
}
|
|
}
|
|
|
|
uBOL_DOMChanged() {
|
|
if ( this.timer !== undefined ) { return; }
|
|
this.timer = self.requestAnimationFrame(( ) => {
|
|
this.timer = undefined;
|
|
this.uBOL_commit();
|
|
});
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
self.ProceduralFiltererAPI = class {
|
|
constructor() {
|
|
this.proceduralFilterer = null;
|
|
this.domObserver = null;
|
|
}
|
|
|
|
async reset() {
|
|
if ( this.domObserver ) {
|
|
this.domObserver.takeRecords();
|
|
this.domObserver.disconnect();
|
|
this.domObserver = null;
|
|
}
|
|
if ( this.proceduralFilterer ) {
|
|
await this.proceduralFilterer.reset();
|
|
this.proceduralFilterer = null;
|
|
}
|
|
}
|
|
|
|
addSelectors(selectors) {
|
|
if ( this.proceduralFilterer === null ) {
|
|
this.proceduralFilterer = new ProceduralFilterer();
|
|
}
|
|
if ( this.domObserver === null ) {
|
|
this.domObserver = new MutationObserver(mutations => {
|
|
this.onDOMChanged(mutations);
|
|
});
|
|
this.domObserver.observe(document, { childList: true, subtree: true });
|
|
}
|
|
this.proceduralFilterer.addSelectors(selectors);
|
|
this.proceduralFilterer.uBOL_commit();
|
|
}
|
|
|
|
qsa(selector) {
|
|
const o = JSON.parse(selector);
|
|
const pselector = new PSelectorRoot(null, o);
|
|
return pselector.exec();
|
|
}
|
|
|
|
onDOMChanged(mutations) {
|
|
for ( const mutation of mutations ) {
|
|
for ( const added of mutation.addedNodes ) {
|
|
if ( added.nodeType !== 1 ) { continue; }
|
|
return this.proceduralFilterer.uBOL_DOMChanged();
|
|
}
|
|
for ( const removed of mutation.removedNodes ) {
|
|
if ( removed.nodeType !== 1 ) { continue; }
|
|
return this.proceduralFilterer.uBOL_DOMChanged();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
})();
|
|
|
|
void 0;
|