mirror of https://github.com/gorhill/uBlock.git
556 lines
19 KiB
JavaScript
556 lines
19 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2017-2018 Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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'use strict';
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// For content pages
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// Abort execution if our global vAPI object does not exist.
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// https://github.com/chrisaljoudi/uBlock/issues/456
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// https://github.com/gorhill/uBlock/issues/2029
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// https://github.com/gorhill/uBlock/issues/3588
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// Chromium 66+ supports user stylesheets. Testing support against a regex is
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// (unfortunately) necessary from content scripts.
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if (
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typeof vAPI === 'object' &&
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/\bEdge\/\d+|\bChrom(?:e|ium)\/(?:[45][0-9]|6[0-5])/.test(navigator.userAgent)
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) {
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// >>>>>>>> start of HUGE-IF-BLOCK
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/******************************************************************************/
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/******************************************************************************/
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vAPI.userStylesheet = {
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style: null,
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styleFixCount: 0,
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css: new Map(),
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disabled: false,
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apply: function() {
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},
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inject: function() {
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this.style = document.createElement('style');
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this.style.disabled = this.disabled;
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var parent = document.head || document.documentElement;
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if ( parent === null ) { return; }
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parent.appendChild(this.style);
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var observer = new MutationObserver(function() {
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if ( this.style === null ) { return; }
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if ( this.style.sheet !== null ) { return; }
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this.styleFixCount += 1;
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if ( this.styleFixCount < 32 ) {
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parent.appendChild(this.style);
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} else {
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observer.disconnect();
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}
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}.bind(this));
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observer.observe(parent, { childList: true });
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},
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add: function(cssText) {
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if ( cssText === '' || this.css.has(cssText) ) { return; }
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if ( this.style === null ) { this.inject(); }
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var sheet = this.style.sheet;
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if ( !sheet ) { return; }
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var i = sheet.cssRules.length;
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sheet.insertRule(cssText, i);
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this.css.set(cssText, sheet.cssRules[i]);
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},
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remove: function(cssText) {
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if ( cssText === '' ) { return; }
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var cssRule = this.css.get(cssText);
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if ( cssRule === undefined ) { return; }
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this.css.delete(cssText);
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if ( this.style === null ) { return; }
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var sheet = this.style.sheet;
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if ( !sheet ) { return; }
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var rules = sheet.cssRules,
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i = rules.length;
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while ( i-- ) {
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if ( rules[i] !== cssRule ) { continue; }
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sheet.deleteRule(i);
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break;
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}
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if ( rules.length !== 0 ) { return; }
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var style = this.style;
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this.style = null;
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var parent = style.parentNode;
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if ( parent !== null ) {
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parent.removeChild(style);
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}
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},
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toggle: function(state) {
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if ( state === undefined ) { state = this.disabled; }
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if ( state !== this.disabled ) { return; }
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this.disabled = !state;
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if ( this.style !== null ) {
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this.style.disabled = this.disabled;
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}
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}
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};
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/******************************************************************************/
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vAPI.DOMFilterer = function() {
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this.commitTimer = new vAPI.SafeAnimationFrame(this.commitNow.bind(this));
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this.domIsReady = document.readyState !== 'loading';
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this.listeners = [];
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this.excludedNodeSet = new WeakSet();
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this.addedNodes = new Set();
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this.removedNodes = false;
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this.specificSimpleHide = new Set();
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this.specificSimpleHideAggregated = undefined;
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this.addedSpecificSimpleHide = [];
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this.specificComplexHide = new Set();
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this.specificComplexHideAggregated = undefined;
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this.addedSpecificComplexHide = [];
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this.specificOthers = [];
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this.genericSimpleHide = new Set();
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this.genericComplexHide = new Set();
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this.hideNodeExpando = undefined;
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this.hideNodeBatchProcessTimer = undefined;
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this.hiddenNodeObserver = undefined;
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this.hiddenNodesetToProcess = new Set();
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this.hiddenNodeset = new WeakSet();
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if ( vAPI.domWatcher instanceof Object ) {
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vAPI.domWatcher.addListener(this);
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}
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};
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vAPI.DOMFilterer.prototype = {
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// https://www.w3.org/community/webed/wiki/CSS/Selectors#Combinators
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reCSSCombinators: /[ >+~]/,
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commitNow: function() {
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this.commitTimer.clear();
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if ( this.domIsReady !== true || vAPI.userStylesheet.disabled ) {
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return;
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}
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var nodes, node;
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// Filterset changed.
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if ( this.addedSpecificSimpleHide.length !== 0 ) {
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//console.time('specific simple filterset changed');
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//console.log('added %d specific simple selectors', this.addedSpecificSimpleHide.length);
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nodes = document.querySelectorAll(this.addedSpecificSimpleHide.join(','));
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for ( node of nodes ) {
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this.hideNode(node);
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}
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this.addedSpecificSimpleHide = [];
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this.specificSimpleHideAggregated = undefined;
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//console.timeEnd('specific simple filterset changed');
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}
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if ( this.addedSpecificComplexHide.length !== 0 ) {
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//console.time('specific complex filterset changed');
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//console.log('added %d specific complex selectors', this.addedSpecificComplexHide.length);
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nodes = document.querySelectorAll(this.addedSpecificComplexHide.join(','));
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for ( node of nodes ) {
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this.hideNode(node);
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}
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this.addedSpecificComplexHide = [];
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this.specificComplexHideAggregated = undefined;
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//console.timeEnd('specific complex filterset changed');
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}
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// DOM layout changed.
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var domNodesAdded = this.addedNodes.size !== 0,
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domLayoutChanged = domNodesAdded || this.removedNodes;
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if ( domNodesAdded === false || domLayoutChanged === false ) {
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return;
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}
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//console.log('%d nodes added', this.addedNodes.size);
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if ( this.specificSimpleHide.size !== 0 && domNodesAdded ) {
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//console.time('dom layout changed/specific simple selectors');
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if ( this.specificSimpleHideAggregated === undefined ) {
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this.specificSimpleHideAggregated =
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Array.from(this.specificSimpleHide).join(',\n');
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}
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for ( node of this.addedNodes ) {
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if ( node[vAPI.matchesProp](this.specificSimpleHideAggregated) ) {
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this.hideNode(node);
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}
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nodes = node.querySelectorAll(this.specificSimpleHideAggregated);
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for ( node of nodes ) {
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this.hideNode(node);
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}
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}
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//console.timeEnd('dom layout changed/specific simple selectors');
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}
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if ( this.specificComplexHide.size !== 0 && domLayoutChanged ) {
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//console.time('dom layout changed/specific complex selectors');
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if ( this.specificComplexHideAggregated === undefined ) {
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this.specificComplexHideAggregated =
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Array.from(this.specificComplexHide).join(',\n');
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}
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nodes = document.querySelectorAll(this.specificComplexHideAggregated);
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for ( node of nodes ) {
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this.hideNode(node);
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}
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//console.timeEnd('dom layout changed/specific complex selectors');
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}
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this.addedNodes.clear();
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this.removedNodes = false;
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},
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commit: function(now) {
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if ( now ) {
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this.commitTimer.clear();
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this.commitNow();
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} else {
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this.commitTimer.start();
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}
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},
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addCSSRule: function(selectors, declarations, details) {
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if ( selectors === undefined ) { return; }
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if ( details === undefined ) { details = {}; }
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var selectorsStr = Array.isArray(selectors) ?
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selectors.join(',\n') :
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selectors;
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if ( selectorsStr.length === 0 ) { return; }
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vAPI.userStylesheet.add(selectorsStr + '\n{' + declarations + '}');
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this.commit();
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if ( this.hasListeners() ) {
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this.triggerListeners({
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declarative: [ [ selectorsStr, declarations ] ]
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});
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}
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if ( declarations !== 'display:none!important;' ) {
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this.specificOthers.push({
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selectors: selectorsStr,
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declarations: declarations
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});
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return;
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}
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// Do not strongly enforce internal CSS rules.
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if ( details.internal ) { return; }
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var isGeneric= details.lazy === true,
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isSimple = details.type === 'simple',
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isComplex = details.type === 'complex',
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selector;
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if ( isGeneric ) {
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if ( isSimple ) {
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this.genericSimpleHide.add(selectorsStr);
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return;
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}
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if ( isComplex ) {
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this.genericComplexHide.add(selectorsStr);
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return;
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}
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}
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var selectorsArr = Array.isArray(selectors) ?
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selectors :
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selectors.split(',\n');
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if ( isGeneric ) {
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for ( selector of selectorsArr ) {
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if ( this.reCSSCombinators.test(selector) ) {
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this.genericComplexHide.add(selector);
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} else {
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this.genericSimpleHide.add(selector);
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}
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}
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return;
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}
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// Specific cosmetic filters.
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for ( selector of selectorsArr ) {
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if (
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isComplex ||
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isSimple === false && this.reCSSCombinators.test(selector)
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) {
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if ( this.specificComplexHide.has(selector) === false ) {
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this.specificComplexHide.add(selector);
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this.addedSpecificComplexHide.push(selector);
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}
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} else if ( this.specificSimpleHide.has(selector) === false ) {
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this.specificSimpleHide.add(selector);
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this.addedSpecificSimpleHide.push(selector);
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}
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}
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},
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onDOMCreated: function() {
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this.domIsReady = true;
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this.addedNodes.clear();
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this.removedNodes = false;
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this.commit();
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},
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onDOMChanged: function(addedNodes, removedNodes) {
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for ( var node of addedNodes ) {
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this.addedNodes.add(node);
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}
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this.removedNodes = this.removedNodes || removedNodes;
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this.commit();
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},
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addListener: function(listener) {
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if ( this.listeners.indexOf(listener) !== -1 ) { return; }
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this.listeners.push(listener);
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},
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removeListener: function(listener) {
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var pos = this.listeners.indexOf(listener);
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if ( pos === -1 ) { return; }
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this.listeners.splice(pos, 1);
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},
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hasListeners: function() {
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return this.listeners.length !== 0;
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},
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triggerListeners: function(changes) {
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var i = this.listeners.length;
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while ( i-- ) {
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this.listeners[i].onFiltersetChanged(changes);
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}
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},
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// https://jsperf.com/clientheight-and-clientwidth-vs-getcomputedstyle
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// Avoid getComputedStyle(), detecting whether a node is visible can be
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// achieved with clientWidth/clientHeight.
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// https://gist.github.com/paulirish/5d52fb081b3570c81e3a
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// Do not interleave read-from/write-to the DOM. Write-to DOM
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// operations would cause the first read-from to be expensive, and
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// interleaving means that potentially all single read-from operation
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// would be expensive rather than just the 1st one.
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// Benchmarking toggling off/on cosmetic filtering confirms quite an
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// improvement when:
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// - batching as much as possible handling of all nodes;
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// - avoiding to interleave read-from/write-to operations.
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// However, toggling off/on cosmetic filtering repeatedly is not
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// a real use case, but this shows this will help performance
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// on sites which try to use inline styles to bypass blockers.
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hideNodeBatchProcess: function() {
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this.hideNodeBatchProcessTimer.clear();
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var expando = this.hideNodeExpando;
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for ( var node of this.hiddenNodesetToProcess ) {
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if (
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this.hiddenNodeset.has(node) === false ||
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node[expando] === undefined ||
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node.clientHeight === 0 || node.clientWidth === 0
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) {
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continue;
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}
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var attr = node.getAttribute('style');
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if ( attr === null ) {
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attr = '';
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} else if (
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attr.length !== 0 &&
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attr.charCodeAt(attr.length - 1) !== 0x3B /* ';' */
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) {
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attr += ';';
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}
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node.setAttribute('style', attr + 'display:none!important;');
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}
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this.hiddenNodesetToProcess.clear();
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},
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hideNodeObserverHandler: function(mutations) {
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if ( vAPI.userStylesheet.disabled ) { return; }
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var i = mutations.length,
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stagedNodes = this.hiddenNodesetToProcess;
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while ( i-- ) {
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stagedNodes.add(mutations[i].target);
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}
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this.hideNodeBatchProcessTimer.start();
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},
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hiddenNodeObserverOptions: {
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attributes: true,
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attributeFilter: [ 'style' ]
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},
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hideNodeInit: function() {
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this.hideNodeExpando = vAPI.randomToken();
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this.hideNodeBatchProcessTimer =
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new vAPI.SafeAnimationFrame(this.hideNodeBatchProcess.bind(this));
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this.hiddenNodeObserver =
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new MutationObserver(this.hideNodeObserverHandler.bind(this));
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if ( this.hideNodeStyleSheetInjected === false ) {
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this.hideNodeStyleSheetInjected = true;
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vAPI.userStylesheet.add(
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'[' + this.hideNodeAttr + ']\n{display:none!important;}'
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);
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}
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},
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excludeNode: function(node) {
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this.excludedNodeSet.add(node);
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this.unhideNode(node);
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},
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unexcludeNode: function(node) {
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this.excludedNodeSet.delete(node);
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},
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hideNode: function(node) {
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if ( this.excludedNodeSet.has(node) ) { return; }
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if ( this.hideNodeAttr === undefined ) { return; }
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if ( this.hiddenNodeset.has(node) ) { return; }
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node.hidden = true;
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this.hiddenNodeset.add(node);
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if ( this.hideNodeExpando === undefined ) { this.hideNodeInit(); }
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node.setAttribute(this.hideNodeAttr, '');
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if ( node[this.hideNodeExpando] === undefined ) {
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node[this.hideNodeExpando] =
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node.hasAttribute('style') &&
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(node.getAttribute('style') || '');
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}
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this.hiddenNodesetToProcess.add(node);
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this.hideNodeBatchProcessTimer.start();
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this.hiddenNodeObserver.observe(node, this.hiddenNodeObserverOptions);
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},
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unhideNode: function(node) {
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if ( this.hiddenNodeset.has(node) === false ) { return; }
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node.hidden = false;
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node.removeAttribute(this.hideNodeAttr);
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this.hiddenNodesetToProcess.delete(node);
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if ( this.hideNodeExpando === undefined ) { return; }
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var attr = node[this.hideNodeExpando];
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if ( attr === false ) {
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node.removeAttribute('style');
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} else if ( typeof attr === 'string' ) {
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node.setAttribute('style', attr);
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}
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node[this.hideNodeExpando] = undefined;
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this.hiddenNodeset.delete(node);
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},
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showNode: function(node) {
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node.hidden = false;
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var attr = node[this.hideNodeExpando];
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if ( attr === false ) {
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node.removeAttribute('style');
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} else if ( typeof attr === 'string' ) {
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node.setAttribute('style', attr);
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}
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},
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unshowNode: function(node) {
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node.hidden = true;
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this.hiddenNodesetToProcess.add(node);
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},
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toggle: function(state, callback) {
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vAPI.userStylesheet.toggle(state);
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var disabled = vAPI.userStylesheet.disabled,
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nodes = document.querySelectorAll('[' + this.hideNodeAttr + ']');
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for ( var node of nodes ) {
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if ( disabled ) {
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this.showNode(node);
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} else {
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this.unshowNode(node);
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}
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}
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if ( disabled === false && this.hideNodeExpando !== undefined ) {
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this.hideNodeBatchProcessTimer.start();
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}
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if ( typeof callback === 'function' ) {
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callback();
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}
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},
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getAllSelectors_: function(all) {
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var out = {
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declarative: []
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};
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if ( this.specificSimpleHide.size !== 0 ) {
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out.declarative.push([
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Array.from(this.specificSimpleHide).join(',\n'),
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'display:none!important;'
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]);
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}
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if ( this.specificComplexHide.size !== 0 ) {
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out.declarative.push([
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Array.from(this.specificComplexHide).join(',\n'),
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'display:none!important;'
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]);
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}
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if ( this.genericSimpleHide.size !== 0 ) {
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out.declarative.push([
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Array.from(this.genericSimpleHide).join(',\n'),
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'display:none!important;'
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]);
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}
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if ( this.genericComplexHide.size !== 0 ) {
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out.declarative.push([
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Array.from(this.genericComplexHide).join(',\n'),
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'display:none!important;'
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]);
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}
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if ( all ) {
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out.declarative.push([
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'[' + this.hideNodeAttr + ']',
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'display:none!important;'
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]);
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}
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for ( var entry of this.specificOthers ) {
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out.declarative.push([ entry.selectors, entry.declarations ]);
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}
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return out;
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},
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|
|
getFilteredElementCount: function() {
|
|
var details = this.getAllSelectors_(true);
|
|
if ( Array.isArray(details.declarative) === false ) { return 0; }
|
|
var selectors = details.declarative.reduce(function(acc, entry) {
|
|
acc.push(entry[0]);
|
|
return acc;
|
|
}, []);
|
|
if ( selectors.length === 0 ) { return 0; }
|
|
return document.querySelectorAll(selectors.join(',\n')).length;
|
|
},
|
|
|
|
getAllSelectors: function() {
|
|
return this.getAllSelectors_(false);
|
|
}
|
|
};
|
|
|
|
/******************************************************************************/
|
|
/******************************************************************************/
|
|
|
|
// <<<<<<<< end of HUGE-IF-BLOCK
|
|
}
|