@openxmldev/linq-to-xml/src/DomParser.js

LINQ to XML for TypeScript

/**
 * @author Thomas Barnekow
 * @license MIT
 */
import { ArgumentException } from './internal.js';
/**
 * Utility class for parsing strings into DOM `XMLDocument` or `Element` instances.
 *
 * @internal
 */
export class DomParser {
    /**
     * Parses the given XML string.
     *
     * @param text The XML string.
     * @returns The parsed `XMLDocument`.
     * @throws An `ArgumentException` if the XML is malformed or does not contain
     *         a root element.
     */
    static parseDocument(text) {
        const document = new DOMParser().parseFromString(text, 'application/xml');
        const parsererror = document.querySelector('parsererror');
        if (parsererror) {
            // At this point, the XML is malformed or the document does not contain a
            // root Element.
            const message = `Error parsing XML: ${parsererror.textContent}`;
            throw new ArgumentException('text', message);
        }
        // At this point, the document will be well-formed and contain a root Element.
        return document;
    }
    /**
     * Parses the given XML string.
     *
     * @param text The XML string.
     * @returns The parsed `Element` or `null`, if no root element exists.
     * @throws An `ArgumentException` if the XML is malformed or does not contain
     *         a root element.
     */
    static parseElement(text) {
        const document = DomParser.parseDocument(text);
        // An XMLDocument created by the DOMParser().parseFromString() method must
        // have a root Element. If that does not exist, our DomParser.parseDocument()
        // method will throw an ArgumentError.
        return document.firstElementChild;
    }
}
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