mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-23 06:01:40 +02:00
884 lines
26 KiB
JavaScript
884 lines
26 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2015 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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/* global vAPI, HTMLDocument */
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/******************************************************************************/
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/******************************************************************************/
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(function() {
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'use strict';
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/464
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if ( document instanceof HTMLDocument === false ) {
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return;
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}
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// This can happen
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if ( typeof vAPI !== 'object' ) {
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return;
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}
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/******************************************************************************/
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if ( document.querySelector('iframe.dom-inspector.' + vAPI.sessionId) !== null ) {
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return;
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}
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/******************************************************************************/
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/******************************************************************************/
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// Modified to avoid installing as a global shim -- so the scriptlet can be
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// flushed from memory once no longer in use.
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/*! http://mths.be/cssescape v0.2.1 by @mathias | MIT license */
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var cssEscape = (function(root) {
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var css = root.CSS || {};
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if ( css.escape ) {
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return css.escape;
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}
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var InvalidCharacterError = function(message) {
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this.message = message;
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};
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InvalidCharacterError.prototype = new Error();
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InvalidCharacterError.prototype.name = 'InvalidCharacterError';
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// http://dev.w3.org/csswg/cssom/#serialize-an-identifier
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return function(value) {
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var string = String(value);
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var length = string.length;
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var index = -1;
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var codeUnit;
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var result = '';
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var firstCodeUnit = string.charCodeAt(0);
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while (++index < length) {
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codeUnit = string.charCodeAt(index);
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// Note: there’s no need to special-case astral symbols, surrogate
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// pairs, or lone surrogates.
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// If the character is NULL (U+0000), then throw an
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// `InvalidCharacterError` exception and terminate these steps.
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if (codeUnit === 0x0000) {
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throw new InvalidCharacterError(
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'Invalid character: the input contains U+0000.'
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);
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}
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if (
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// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
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// U+007F, […]
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(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
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// If the character is the first character and is in the range [0-9]
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// (U+0030 to U+0039), […]
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(index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
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// If the character is the second character and is in the range [0-9]
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// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
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(
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index == 1 &&
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codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
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firstCodeUnit == 0x002D
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)
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) {
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// http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
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result += '\\' + codeUnit.toString(16) + ' ';
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continue;
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}
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// If the character is not handled by one of the above rules and is
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// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
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// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
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// U+005A), or [a-z] (U+0061 to U+007A), […]
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if (
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codeUnit >= 0x0080 ||
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codeUnit == 0x002D ||
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codeUnit == 0x005F ||
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codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
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codeUnit >= 0x0041 && codeUnit <= 0x005A ||
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codeUnit >= 0x0061 && codeUnit <= 0x007A
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) {
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// the character itself
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result += string.charAt(index);
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continue;
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}
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// Otherwise, the escaped character.
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// http://dev.w3.org/csswg/cssom/#escape-a-character
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result += '\\' + string.charAt(index);
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}
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return result;
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};
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}(self));
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/******************************************************************************/
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/******************************************************************************/
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var localMessager = vAPI.messaging.channel('dom-inspector.js');
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// Highlighter-related
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var svgOcean = null;
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var svgIslands = null;
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var svgRoot = null;
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var pickerRoot = null;
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var highlightedElements = [];
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var nodeToIdMap = new WeakMap(); // No need to iterate
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var toggledNodes = new Map();
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/******************************************************************************/
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// Some kind of fingerprint for the DOM, without incurring too much overhead.
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var domFingerprint = function() {
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return vAPI.sessionId;
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};
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/******************************************************************************/
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var domLayout = (function() {
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var skipTagNames = {
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'br': 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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var resourceAttrNames = {
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'a': 'href',
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'iframe': 'src',
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'img': 'src',
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'object': 'data'
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};
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var idGenerator = 0;
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// This will be used to uniquely identify nodes across process.
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var newNodeId = function(node) {
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var nid = 'n' + (idGenerator++).toString(36);
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nodeToIdMap.set(node, nid);
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return nid;
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};
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// Collect all nodes which are directly affected by cosmetic filters: these
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// will be reported in the layout data.
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// TODO: take into account cosmetic filters added after the map is build.
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var nodeToCosmeticFilterMap = (function() {
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var out = new WeakMap();
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var styleTags = vAPI.styles || [];
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var i = styleTags.length;
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var selectors, styleText, j, selector, nodes, k;
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while ( i-- ) {
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styleText = styleTags[i].textContent;
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selectors = styleText.slice(0, styleText.lastIndexOf('\n')).split(/,\n/);
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j = selectors.length;
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while ( j-- ) {
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selector = selectors[j];
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nodes = document.querySelectorAll(selector);
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k = nodes.length;
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while ( k-- ) {
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out.set(nodes[k], selector);
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}
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}
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}
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return out;
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})();
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/*
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var matchesSelector = (function() {
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if ( typeof Element.prototype.matches === 'function' ) {
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return 'matches';
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}
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if ( typeof Element.prototype.mozMatchesSelector === 'function' ) {
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return 'mozMatchesSelector';
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}
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if ( typeof Element.prototype.webkitMatchesSelector === 'function' ) {
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return 'webkitMatchesSelector';
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}
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return '';
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})();
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*/
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var selectorFromNode = function(node) {
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var str, attr, pos, sw, i;
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var tag = node.localName;
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var selector = cssEscape(tag);
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// Id
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if ( typeof node.id === 'string' ) {
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str = node.id.trim();
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if ( str !== '' ) {
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selector += '#' + cssEscape(str);
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}
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}
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// Class
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var cl = node.classList;
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if ( cl ) {
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for ( i = 0; i < cl.length; i++ ) {
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selector += '.' + cssEscape(cl[i]);
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}
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}
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// Tag-specific attributes
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if ( resourceAttrNames.hasOwnProperty(tag) ) {
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attr = resourceAttrNames[tag];
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str = node.getAttribute(attr) || '';
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str = str.trim();
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pos = str.indexOf('#');
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if ( pos !== -1 ) {
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str = str.slice(0, pos);
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sw = '^';
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} else {
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sw = '';
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}
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if ( str !== '' ) {
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selector += '[' + attr + sw + '="' + cssEscape(str) + '"]';
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}
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}
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return selector;
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};
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var DomRoot = function() {
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this.nid = newNodeId(document.body);
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this.lvl = 0;
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this.sel = 'body';
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this.cnt = 0;
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this.filter = nodeToCosmeticFilterMap.get(document.body);
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};
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var DomNode = function(node, level) {
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this.nid = newNodeId(node);
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this.lvl = level;
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this.sel = selectorFromNode(node);
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this.cnt = 0;
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this.filter = nodeToCosmeticFilterMap.get(node);
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};
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var domNodeFactory = function(level, node) {
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var localName = node.localName;
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if ( skipTagNames.hasOwnProperty(localName) ) {
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return null;
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}
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// skip uBlock's own nodes
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if ( node.classList.contains(vAPI.sessionId) ) {
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return null;
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}
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if ( level === 0 && localName === 'body' ) {
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return new DomRoot();
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}
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return new DomNode(node, level);
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};
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// Collect layout data.
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var getLayoutData = function() {
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var layout = [];
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var stack = [];
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var node = document.body;
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var domNode;
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var lvl = 0;
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for (;;) {
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domNode = domNodeFactory(lvl, node);
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if ( domNode !== null ) {
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layout.push(domNode);
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}
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// children
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if ( node.firstElementChild !== null ) {
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stack.push(node);
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lvl += 1;
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node = node.firstElementChild;
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continue;
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}
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// sibling
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if ( node.nextElementSibling === null ) {
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do {
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node = stack.pop();
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if ( !node ) { break; }
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lvl -= 1;
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} while ( node.nextElementSibling === null );
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if ( !node ) { break; }
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}
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node = node.nextElementSibling;
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}
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return layout;
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};
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// Descendant count for each node.
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var patchLayoutData = function(layout) {
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var stack = [], ptr;
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var lvl = 0;
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var domNode, cnt;
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var i = layout.length;
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while ( i-- ) {
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domNode = layout[i];
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if ( domNode.lvl === lvl ) {
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stack[ptr] += 1;
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continue;
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}
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if ( domNode.lvl > lvl ) {
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while ( lvl < domNode.lvl ) {
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stack.push(0);
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lvl += 1;
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}
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ptr = lvl - 1;
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stack[ptr] += 1;
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continue;
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}
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// domNode.lvl < lvl
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cnt = stack.pop();
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domNode.cnt = cnt;
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lvl -= 1;
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ptr = lvl - 1;
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stack[ptr] += cnt + 1;
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}
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return layout;
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};
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// Track and report mutations to the DOM
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var journalEntries = [];
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var journalNodes = Object.create(null);
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var mutationObserver = null;
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var mutationTimer = null;
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var addedNodelists = [];
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var removedNodelist = [];
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var previousElementSiblingId = function(node) {
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var sibling = node;
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for (;;) {
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sibling = sibling.previousElementSibling;
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if ( sibling === null ) {
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return null;
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}
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if ( skipTagNames.hasOwnProperty(sibling.localName) ) {
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continue;
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}
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return nodeToIdMap.get(sibling);
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}
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};
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var journalFromBranch = function(root, added) {
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var domNode;
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var node = root.firstElementChild;
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while ( node !== null ) {
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domNode = domNodeFactory(undefined, node);
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if ( domNode !== null ) {
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journalNodes[domNode.nid] = domNode;
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added.push(node);
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}
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// down
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if ( node.firstElementChild !== null ) {
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node = node.firstElementChild;
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continue;
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}
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// right
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if ( node.nextElementSibling !== null ) {
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node = node.nextElementSibling;
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continue;
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}
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// up then right
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for (;;) {
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if ( node.parentElement === root ) {
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return;
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}
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node = node.parentElement;
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if ( node.nextElementSibling !== null ) {
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node = node.nextElementSibling;
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break;
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}
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}
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}
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};
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var journalFromMutations = function() {
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mutationTimer = null;
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if ( mutationObserver === null ) {
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addedNodelists = [];
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removedNodelist = [];
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return;
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}
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var i, m, nodelist, j, n, node, domNode, nid;
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// This is used to temporarily hold all added nodes, before resolving
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// their node id and relative position.
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var added = [];
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for ( i = 0, m = addedNodelists.length; i < m; i++ ) {
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nodelist = addedNodelists[i];
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for ( j = 0, n = nodelist.length; j < n; j++ ) {
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node = nodelist[j];
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if ( node.nodeType !== 1 ) {
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continue;
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}
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// I don't think this can ever happen
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if ( node.parentElement === null ) {
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continue;
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}
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domNode = domNodeFactory(undefined, node);
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if ( domNode !== null ) {
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journalNodes[domNode.nid] = domNode;
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added.push(node);
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}
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journalFromBranch(node, added);
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}
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}
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addedNodelists = [];
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for ( i = 0, m = removedNodelist.length; i < m; i++ ) {
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nodelist = removedNodelist[i];
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for ( j = 0, n = nodelist.length; j < n; j++ ) {
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node = nodelist[j];
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if ( node.nodeType !== 1 ) {
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continue;
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}
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nid = nodeToIdMap.get(node);
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if ( nid === undefined ) {
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continue;
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}
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journalEntries.push({
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what: -1,
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nid: nid
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});
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}
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}
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removedNodelist = [];
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for ( i = 0, n = added.length; i < n; i++ ) {
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node = added[i];
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journalEntries.push({
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what: 1,
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nid: nodeToIdMap.get(node),
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u: nodeToIdMap.get(node.parentElement),
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l: previousElementSiblingId(node)
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});
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}
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};
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var onMutationObserved = function(mutationRecords) {
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var record;
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for ( var i = 0, n = mutationRecords.length; i < n; i++ ) {
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record = mutationRecords[i];
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if ( record.addedNodes.length !== 0 ) {
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addedNodelists.push(record.addedNodes);
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}
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if ( record.removedNodes.length !== 0 ) {
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removedNodelist.push(record.removedNodes);
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}
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}
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if ( mutationTimer === null ) {
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mutationTimer = vAPI.setTimeout(journalFromMutations, 1000);
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}
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};
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// API
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var getLayout = function(fingerprint) {
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if ( fingerprint !== domFingerprint() && mutationObserver !== null ) {
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if ( mutationTimer !== null ) {
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clearTimeout(mutationTimer);
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mutationTimer = null;
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}
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mutationObserver.disconnect();
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mutationObserver = null;
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journalEntries = [];
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journalNodes = Object.create(null);
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}
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var response = {
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what: 'domLayout',
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fingerprint: domFingerprint(),
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hostname: window.location.hostname
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};
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// No mutation observer means we need to send full layout
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if ( mutationObserver === null ) {
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mutationObserver = new MutationObserver(onMutationObserved);
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mutationObserver.observe(document.body, {
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childList: true,
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subtree: true
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});
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response.status = 'full';
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response.layout = patchLayoutData(getLayoutData());
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return response;
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}
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// Incremental layout
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if ( journalEntries.length !== 0 ) {
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response.status = 'incremental';
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response.journal = journalEntries;
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response.nodes = journalNodes;
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journalEntries = [];
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journalNodes = Object.create(null);
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return response;
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}
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response.status = 'nochange';
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return response;
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};
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var shutdown = function() {
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if ( mutationTimer !== null ) {
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clearTimeout(mutationTimer);
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mutationTimer = null;
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}
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if ( mutationObserver !== null ) {
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mutationObserver.disconnect();
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mutationObserver = null;
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}
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journalEntries = [];
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journalNodes = Object.create(null);
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};
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return {
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get: getLayout,
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shutdown: shutdown
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};
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})();
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// https://www.youtube.com/watch?v=qo8zKhd4Cf0
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/******************************************************************************/
|
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var highlightElements = function(scrollTo) {
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||
var elems = highlightedElements;
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var wv = pickerRoot.contentWindow.innerWidth;
|
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var hv = pickerRoot.contentWindow.innerHeight;
|
||
var ocean = ['M0 0h' + wv + 'v' + hv + 'h-' + wv, 'z'];
|
||
var islands = [];
|
||
var elem, rect, poly;
|
||
var xl, xr, yt, yb, w, h, ws;
|
||
var xlu = Number.MAX_VALUE, xru = 0, ytu = Number.MAX_VALUE, ybu = 0;
|
||
|
||
for ( var i = 0; i < elems.length; i++ ) {
|
||
elem = elems[i];
|
||
if ( elem === pickerRoot ) {
|
||
continue;
|
||
}
|
||
if ( typeof elem.getBoundingClientRect !== 'function' ) {
|
||
continue;
|
||
}
|
||
|
||
rect = elem.getBoundingClientRect();
|
||
xl = rect.left;
|
||
xr = rect.right;
|
||
w = rect.width;
|
||
yt = rect.top;
|
||
yb = rect.bottom;
|
||
h = rect.height;
|
||
|
||
ws = w.toFixed(1);
|
||
poly = 'M' + xl.toFixed(1) + ' ' + yt.toFixed(1) +
|
||
'h' + ws +
|
||
'v' + h.toFixed(1) +
|
||
'h-' + ws +
|
||
'z';
|
||
ocean.push(poly);
|
||
islands.push(poly);
|
||
|
||
if ( !scrollTo ) {
|
||
continue;
|
||
}
|
||
|
||
if ( xl < xlu ) { xlu = xl; }
|
||
if ( xr > xru ) { xru = xr; }
|
||
if ( yt < ytu ) { ytu = yt; }
|
||
if ( yb > ybu ) { ybu = yb; }
|
||
}
|
||
svgOcean.setAttribute('d', ocean.join(''));
|
||
svgIslands.setAttribute('d', islands.join('') || 'M0 0');
|
||
|
||
if ( !scrollTo ) {
|
||
return;
|
||
}
|
||
|
||
// Highlighted area completely within viewport
|
||
if ( xlu >= 0 && xru <= wv && ytu >= 0 && ybu <= hv ) {
|
||
return;
|
||
}
|
||
|
||
var dx = 0, dy = 0;
|
||
|
||
if ( xru > wv ) {
|
||
dx = xru - wv;
|
||
xlu -= dx;
|
||
}
|
||
if ( xlu < 0 ) {
|
||
dx += xlu;
|
||
}
|
||
if ( ybu > hv ) {
|
||
dy = ybu - hv;
|
||
ytu -= dy;
|
||
}
|
||
if ( ytu < 0 ) {
|
||
dy += ytu;
|
||
}
|
||
|
||
if ( dx !== 0 || dy !== 0 ) {
|
||
window.scrollBy(dx, dy);
|
||
}
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var elementsFromSelector = function(filter) {
|
||
var out = [];
|
||
try {
|
||
out = document.querySelectorAll(filter);
|
||
} catch (ex) {
|
||
}
|
||
return out;
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var selectNodes = function(selector, nid) {
|
||
var nodes = elementsFromSelector(selector);
|
||
if ( nid === '' ) {
|
||
return nodes;
|
||
}
|
||
var i = nodes.length;
|
||
while ( i-- ) {
|
||
if ( nodeToIdMap.get(nodes[i]) === nid ) {
|
||
return [nodes[i]];
|
||
}
|
||
}
|
||
return [];
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var hightlightNodes = function(selector, nid, scrollTo) {
|
||
highlightedElements = selectNodes(selector, nid);
|
||
highlightElements(scrollTo);
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var onScrolled = function() {
|
||
highlightElements();
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
// original, target = what to do
|
||
// any, any = restore saved display property
|
||
// any, hidden = set display to `none`, remember original state
|
||
// hidden, any = remove display property, don't remember original state
|
||
// hidden, hidden = set display to `none`
|
||
|
||
var toggleNodes = function(nodes, originalState, targetState) {
|
||
var i = nodes.length;
|
||
if ( i === 0 ) {
|
||
return;
|
||
}
|
||
var node, value;
|
||
while ( i-- ) {
|
||
node = nodes[i];
|
||
if ( originalState ) { // any, ?
|
||
if ( targetState ) { // any, any
|
||
value = toggledNodes.get(node);
|
||
if ( value === undefined ) {
|
||
continue;
|
||
}
|
||
if ( value !== null ) {
|
||
node.style.removeProperty('display');
|
||
} else {
|
||
node.style.setProperty('display', value);
|
||
}
|
||
toggledNodes.delete(node);
|
||
} else { // any, hidden
|
||
toggledNodes.set(node, node.style.getPropertyValue('display') || null);
|
||
node.style.setProperty('display', 'none');
|
||
}
|
||
} else { // hidden, ?
|
||
if ( targetState ) { // hidden, any
|
||
node.style.setProperty('display', 'initial', 'important');
|
||
} else { // hidden, hidden
|
||
node.style.setProperty('display', 'none', 'important');
|
||
}
|
||
}
|
||
}
|
||
};
|
||
|
||
// https://www.youtube.com/watch?v=L5jRewnxSBY
|
||
|
||
/******************************************************************************/
|
||
|
||
var resetToggledNodes = function() {
|
||
var value;
|
||
// Chromium does not support destructuring as of v43.
|
||
for ( var node of toggledNodes.keys() ) {
|
||
value = toggledNodes.get(node);
|
||
if ( value !== null ) {
|
||
node.style.removeProperty('display');
|
||
} else {
|
||
node.style.setProperty('display', value);
|
||
}
|
||
}
|
||
toggledNodes.clear();
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var shutdown = function() {
|
||
resetToggledNodes();
|
||
domLayout.shutdown();
|
||
localMessager.removeAllListeners();
|
||
localMessager.close();
|
||
localMessager = null;
|
||
window.removeEventListener('scroll', onScrolled, true);
|
||
document.documentElement.removeChild(pickerRoot);
|
||
pickerRoot = svgRoot = svgOcean = svgIslands = null;
|
||
highlightedElements = [];
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
var onMessage = function(request) {
|
||
var response;
|
||
|
||
switch ( request.what ) {
|
||
case 'domLayout':
|
||
response = domLayout.get(request.fingerprint);
|
||
break;
|
||
|
||
case 'highlightMode':
|
||
svgRoot.classList.toggle('invert', request.invert);
|
||
break;
|
||
|
||
case 'highlightOne':
|
||
hightlightNodes(request.selector, request.nid, request.scrollTo);
|
||
break;
|
||
|
||
case 'resetToggledNodes':
|
||
resetToggledNodes();
|
||
break;
|
||
|
||
case 'toggleNodes':
|
||
highlightedElements = selectNodes(request.selector, request.nid);
|
||
toggleNodes(highlightedElements, request.original, request.target);
|
||
highlightElements(true);
|
||
break;
|
||
|
||
case 'shutdown':
|
||
shutdown();
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return response;
|
||
};
|
||
|
||
/******************************************************************************/
|
||
|
||
// Install DOM inspector widget
|
||
|
||
pickerRoot = document.createElement('iframe');
|
||
pickerRoot.classList.add(vAPI.sessionId);
|
||
pickerRoot.classList.add('dom-inspector');
|
||
pickerRoot.style.cssText = [
|
||
'background: transparent',
|
||
'border: 0',
|
||
'border-radius: 0',
|
||
'box-shadow: none',
|
||
'display: block',
|
||
'height: 100%',
|
||
'left: 0',
|
||
'margin: 0',
|
||
'opacity: 1',
|
||
'position: fixed',
|
||
'outline: 0',
|
||
'padding: 0',
|
||
'top: 0',
|
||
'visibility: visible',
|
||
'width: 100%',
|
||
'z-index: 2147483647',
|
||
''
|
||
].join(' !important;\n');
|
||
|
||
pickerRoot.onload = function() {
|
||
pickerRoot.onload = null;
|
||
var pickerDoc = this.contentDocument;
|
||
|
||
var style = pickerDoc.createElement('style');
|
||
style.textContent = [
|
||
'body {',
|
||
'background-color: transparent;',
|
||
'cursor: crosshair;',
|
||
'}',
|
||
'svg {',
|
||
'height: 100%;',
|
||
'left: 0;',
|
||
'position: fixed;',
|
||
'top: 0;',
|
||
'width: 100%;',
|
||
'}',
|
||
'svg > path:first-child {',
|
||
'fill: rgba(0,0,0,0.75);',
|
||
'fill-rule: evenodd;',
|
||
'}',
|
||
'svg > path + path {',
|
||
'fill: rgba(0,0,255,0.1);',
|
||
'stroke: #FFF;',
|
||
'stroke-width: 0.5px;',
|
||
'}',
|
||
'svg.invert > path:first-child {',
|
||
'fill: rgba(0,0,255,0.1);',
|
||
'}',
|
||
'svg.invert > path + path {',
|
||
'fill: rgba(0,0,0,0.75);',
|
||
'stroke: #000;',
|
||
'}',
|
||
''
|
||
].join('\n');
|
||
pickerDoc.body.appendChild(style);
|
||
|
||
svgRoot = pickerDoc.createElementNS('http://www.w3.org/2000/svg', 'svg');
|
||
svgOcean = pickerDoc.createElementNS('http://www.w3.org/2000/svg', 'path');
|
||
svgRoot.appendChild(svgOcean);
|
||
svgIslands = pickerDoc.createElementNS('http://www.w3.org/2000/svg', 'path');
|
||
svgRoot.appendChild(svgIslands);
|
||
pickerDoc.body.appendChild(svgRoot);
|
||
|
||
window.addEventListener('scroll', onScrolled, true);
|
||
|
||
highlightElements();
|
||
|
||
localMessager.addListener(onMessage);
|
||
};
|
||
|
||
document.documentElement.appendChild(pickerRoot);
|
||
|
||
/******************************************************************************/
|
||
|
||
})();
|
||
|
||
/******************************************************************************/
|