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+/*
+ * Copyright (C) 2020 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]);
+ }
+ }
+ }
+ }
+}