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/*
* Copyright (C) 2023 Yomitan Authors
* Copyright (C) 2020-2022 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/>.
*/
import * as parse5 from 'parse5';
/**
* @augments import('simple-dom-parser').ISimpleDomParser
*/
export class SimpleDOMParser {
/**
* @param {string} content
*/
constructor(content) {
/** @type {import('parse5')} */
// @ts-ignore - parse5 global is not defined in typescript declaration
this._parse5Lib = /** @type {import('parse5')} */ (parse5);
/** @type {import('parse5').TreeAdapter<import('parse5').DefaultTreeAdapterMap>} */
this._treeAdapter = this._parse5Lib.defaultTreeAdapter;
/** @type {import('simple-dom-parser').Parse5Document} */
this._document = this._parse5Lib.parse(content, {
treeAdapter: this._treeAdapter
});
/** @type {RegExp} */
this._patternHtmlWhitespace = /[\t\r\n\f ]+/g;
}
/**
* @param {string} id
* @param {import('simple-dom-parser').Element} [root]
* @returns {?import('simple-dom-parser').Element}
*/
getElementById(id, root) {
for (const node of this._allNodes(root)) {
if (!this._treeAdapter.isElementNode(node) || this.getAttribute(node, 'id') !== id) { continue; }
return node;
}
return null;
}
/**
* @param {string} tagName
* @param {import('simple-dom-parser').Element} [root]
* @returns {?import('simple-dom-parser').Element}
*/
getElementByTagName(tagName, root) {
for (const node of this._allNodes(root)) {
if (!this._treeAdapter.isElementNode(node) || node.tagName !== tagName) { continue; }
return node;
}
return null;
}
/**
* @param {string} tagName
* @param {import('simple-dom-parser').Element} [root]
* @returns {import('simple-dom-parser').Element[]}
*/
getElementsByTagName(tagName, root) {
const results = [];
for (const node of this._allNodes(root)) {
if (!this._treeAdapter.isElementNode(node) || node.tagName !== tagName) { continue; }
results.push(node);
}
return results;
}
/**
* @param {string} className
* @param {import('simple-dom-parser').Element} [root]
* @returns {import('simple-dom-parser').Element[]}
*/
getElementsByClassName(className, root) {
const results = [];
for (const node of this._allNodes(root)) {
if (!this._treeAdapter.isElementNode(node)) { continue; }
const nodeClassName = this.getAttribute(node, 'class');
if (nodeClassName !== null && this._hasToken(nodeClassName, className)) {
results.push(node);
}
}
return results;
}
/**
* @param {import('simple-dom-parser').Element} element
* @param {string} attribute
* @returns {?string}
*/
getAttribute(element, attribute) {
for (const attr of /** @type {import('simple-dom-parser').Parse5Element} */ (element).attrs) {
if (
attr.name === attribute &&
typeof attr.namespace === 'undefined'
) {
return attr.value;
}
}
return null;
}
/**
* @param {import('simple-dom-parser').Element} element
* @returns {string}
*/
getTextContent(element) {
let source = '';
for (const node of this._allNodes(element)) {
if (this._treeAdapter.isTextNode(node)) {
source += node.value;
}
}
return source;
}
/**
* @returns {boolean}
*/
static isSupported() {
// @ts-ignore - parse5 global is not defined in typescript declaration
return typeof parse5 !== 'undefined';
}
// Private
/**
* @param {import('simple-dom-parser').Element|undefined} root
* @returns {Generator<import('simple-dom-parser').Parse5ChildNode, void, unknown>}
* @yields {import('simple-dom-parser').Parse5ChildNode}
*/
*_allNodes(root) {
// Depth-first pre-order traversal
/** @type {import('simple-dom-parser').Parse5ChildNode[]} */
const nodeQueue = [];
if (typeof root !== 'undefined') {
nodeQueue.push(/** @type {import('simple-dom-parser').Parse5Element} */ (root));
} else {
nodeQueue.push(...this._document.childNodes);
}
while (nodeQueue.length > 0) {
const node = /** @type {import('simple-dom-parser').Parse5ChildNode} */ (nodeQueue.pop());
yield node;
if (this._treeAdapter.isElementNode(node)) {
const {childNodes} = node;
if (typeof childNodes !== 'undefined') {
for (let i = childNodes.length - 1; i >= 0; --i) {
nodeQueue.push(childNodes[i]);
}
}
}
}
}
/**
* @param {string} tokenListString
* @param {string} token
* @returns {boolean}
*/
_hasToken(tokenListString, token) {
let start = 0;
const pattern = this._patternHtmlWhitespace;
pattern.lastIndex = 0;
while (true) {
const match = pattern.exec(tokenListString);
const end = match === null ? tokenListString.length : match.index;
if (end > start && tokenListString.substring(start, end) === token) { return true; }
if (match === null) { return false; }
start = end + match[0].length;
}
}
}
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