/* * Copyright (C) 2020-2021 Yomichan Authors * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* globals * parse5 */ class SimpleDOMParser { constructor(content) { this._document = parse5.parse(content); } getElementById(id, root=null) { for (const node of this._allNodes(root)) { if (typeof node.tagName === 'string' && this.getAttribute(node, 'id') === id) { return node; } } return null; } getElementByTagName(tagName, root=null) { for (const node of this._allNodes(root)) { if (node.tagName === tagName) { return node; } } return null; } getElementsByTagName(tagName, root=null) { const results = []; for (const node of this._allNodes(root)) { if (node.tagName === tagName) { results.push(node); } } return results; } getElementsByClassName(className, root=null) { const results = []; const classNamePattern = new RegExp(`(^|\\s)${escapeRegExp(className)}(\\s|$)`); for (const node of this._allNodes(root)) { if (typeof node.tagName === 'string') { const nodeClassName = this.getAttribute(node, 'class'); if (nodeClassName !== null && classNamePattern.test(nodeClassName)) { results.push(node); } } } return results; } getAttribute(element, attribute) { for (const attr of element.attrs) { if ( attr.name === attribute && typeof attr.namespace === 'undefined' ) { return attr.value; } } return null; } getTextContent(element) { let source = ''; for (const node of this._allNodes(element)) { if (node.nodeName === '#text') { source += node.value; } } return source; } static isSupported() { return typeof parse5 !== 'undefined'; } // Private *_allNodes(root) { if (root === null) { root = this._document; } // Depth-first pre-order traversal const nodeQueue = [root]; while (nodeQueue.length > 0) { const node = nodeQueue.pop(); yield node; const childNodes = node.childNodes; if (typeof childNodes !== 'undefined') { for (let i = childNodes.length - 1; i >= 0; --i) { nodeQueue.push(childNodes[i]); } } } } }