mirror of
https://github.com/gorhill/uBlock.git
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122 lines
3.5 KiB
JavaScript
122 lines
3.5 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* jshint esversion:11 */
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'use strict';
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/******************************************************************************/
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function normalizeTarget(target) {
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if ( target === null ) { return []; }
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if ( Array.isArray(target) ) { return target; }
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return target instanceof Element
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? [ target ]
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: Array.from(target);
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}
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function makeEventHandler(selector, callback) {
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return function(event) {
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const dispatcher = event.currentTarget;
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if (
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dispatcher instanceof HTMLElement === false ||
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typeof dispatcher.querySelectorAll !== 'function'
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) {
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return;
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}
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const receiver = event.target;
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const ancestor = receiver.closest(selector);
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if (
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ancestor === receiver &&
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ancestor !== dispatcher &&
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dispatcher.contains(ancestor)
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) {
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callback.call(receiver, event);
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}
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};
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}
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/******************************************************************************/
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class dom {
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static addClass(target, cl) {
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for ( const elem of normalizeTarget(target) ) {
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elem.classList.add(cl);
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}
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}
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static toggleClass(target, cl, state = undefined) {
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for ( const elem of normalizeTarget(target) ) {
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elem.classList.toggle(cl, state);
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}
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}
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static removeClass(target, cl) {
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for ( const elem of normalizeTarget(target) ) {
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elem.classList.remove(cl);
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}
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}
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static attr(target, attr, value = undefined) {
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for ( const elem of normalizeTarget(target) ) {
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if ( value === undefined ) {
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return elem.getAttribute(attr);
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}
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elem.setAttribute(attr, value);
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}
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}
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static remove(target) {
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for ( const elem of normalizeTarget(target) ) {
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elem.remove();
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}
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}
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static on(target, type, selector, callback) {
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if ( typeof selector === 'function' ) {
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callback = selector;
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selector = undefined;
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} else {
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callback = makeEventHandler(selector, callback);
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}
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for ( const elem of normalizeTarget(target) ) {
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elem.addEventListener(type, callback, selector !== undefined);
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}
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}
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}
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dom.body = document.body;
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/******************************************************************************/
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function qs$(s, elem = undefined) {
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return (elem || document).querySelector(s);
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}
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function qsa$(s, elem = undefined) {
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return (elem || document).querySelectorAll(s);
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}
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/******************************************************************************/
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export { dom, qs$, qsa$ };
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