happy-dom/lib/dom-parser/DOMParser.js

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

import * as PropertySymbol from '../PropertySymbol.js';
import XMLParser from '../xml-parser/XMLParser.js';
import NodeTypeEnum from '../nodes/node/NodeTypeEnum.js';
/**
 * DOM parser.
 *
 * Reference:
 * https://developer.mozilla.org/en-US/docs/Web/API/DOMParser.
 */
export default class DOMParser {
    /**
     * Parses HTML and returns a root element.
     *
     * @param string HTML data.
     * @param mimeType Mime type.
     * @returns Root element.
     */
    parseFromString(string, mimeType) {
        if (!mimeType) {
            throw new this[PropertySymbol.window].DOMException('Second parameter "mimeType" is mandatory.');
        }
        const newDocument = this.#createDocument(mimeType);
        const documentChildNodes = newDocument[PropertySymbol.nodeArray];
        while (documentChildNodes.length) {
            newDocument.removeChild(documentChildNodes[0]);
        }
        const root = XMLParser.parse(newDocument, string, { evaluateScripts: true });
        let documentElement = null;
        let documentTypeNode = null;
        for (const node of root[PropertySymbol.nodeArray]) {
            if (node['tagName'] === 'HTML') {
                documentElement = node;
            }
            else if (node[PropertySymbol.nodeType] === NodeTypeEnum.documentTypeNode) {
                documentTypeNode = node;
            }
            if (documentElement && documentTypeNode) {
                break;
            }
        }
        if (documentElement) {
            if (documentTypeNode) {
                newDocument.appendChild(documentTypeNode);
            }
            newDocument.appendChild(documentElement);
            const body = newDocument.body;
            if (body) {
                while (root[PropertySymbol.nodeArray].length) {
                    body.appendChild(root[PropertySymbol.nodeArray][0]);
                }
            }
        }
        else {
            switch (mimeType) {
                case 'image/svg+xml':
                    {
                        while (root[PropertySymbol.nodeArray].length) {
                            newDocument.appendChild(root[PropertySymbol.nodeArray][0]);
                        }
                    }
                    break;
                case 'text/html':
                default:
                    {
                        const documentElement = newDocument.createElement('html');
                        const bodyElement = newDocument.createElement('body');
                        const headElement = newDocument.createElement('head');
                        documentElement.appendChild(headElement);
                        documentElement.appendChild(bodyElement);
                        newDocument.appendChild(documentElement);
                        while (root[PropertySymbol.nodeArray].length) {
                            bodyElement.appendChild(root[PropertySymbol.nodeArray][0]);
                        }
                    }
                    break;
            }
        }
        return newDocument;
    }
    /**
     *
     * @param mimeType Mime type.
     * @returns Document.
     */
    #createDocument(mimeType) {
        const window = this[PropertySymbol.window];
        switch (mimeType) {
            case 'text/html':
                return new window.HTMLDocument();
            case 'image/svg+xml':
                return new window.SVGDocument();
            case 'text/xml':
            case 'application/xml':
            case 'application/xhtml+xml':
                return new window.XMLDocument();
            default:
                throw new window.DOMException(`Unknown mime type "${mimeType}".`);
        }
    }
}
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