@stringsync/vexml/dist/esm/mxl/mxl.js

MusicXML to Vexflow

import JSZip from 'jszip';
import { Container } from './container';
import { NamedElement } from '../util';
const META_PATH = 'META-INF/container.xml';
const MUSICXML_MIME_TYPES = [
    'text/xml',
    'application/xml',
    'application/x-xml',
    'application/vnd.recordare.musicxml+xml',
];
/** Represents the manifest for a compressed MusicXML file. */
export class MXL {
    blob;
    constructor(blob) {
        this.blob = blob;
    }
    /**
     * Returns the MusicXML string.
     * @throws {Error} when the blob cannot be handled like a MXL file.
     */
    async getMusicXML() {
        const zip = await JSZip.loadAsync(this.blob);
        const xml = await zip.file(META_PATH)?.async('string');
        if (typeof xml === 'undefined') {
            throw new Error(`could not extract manifest from: ${META_PATH}`);
        }
        const parser = new DOMParser();
        const doc = parser.parseFromString(xml, 'application/xml');
        const node = doc.getElementsByTagName('container').item(0);
        if (!node) {
            throw new Error('could not locate a <container> element');
        }
        const container = new Container(NamedElement.of(node));
        const path = container
            .getRootfiles()
            .find((rootfile) => MUSICXML_MIME_TYPES.includes(rootfile.getMediaType()))
            ?.getFullPath();
        if (typeof path === 'undefined') {
            throw new Error(`could not find a <rootfile> with type: ${MUSICXML_MIME_TYPES.join(',')}`);
        }
        const musicXML = await zip.file(path)?.async('string');
        if (typeof musicXML !== 'string') {
            throw new Error(`could not find file with path: ${path}`);
        }
        return musicXML;
    }
}