piano-notes-book/src/pages/scores/[asset].svg.ts

import createVerovioModule from 'verovio/wasm';
import { VerovioToolkit } from 'verovio/esm';
import { readFile, readdir } from 'node:fs/promises';
import { JSDOM } from 'jsdom';
import type {APIRoute, GetStaticPaths} from 'astro';

const filter = (musicXml: string) => {
	const jsdom = new JSDOM(musicXml, { pretendToBeVisual: true, contentType: 'image/svg+xml' });
	const win = jsdom.window;
	// const win = jsdom.window;
	return win.document.documentElement.outerHTML;
};

const processOutput = (xmlData: string) => {
	const jsdom = new JSDOM(xmlData, { pretendToBeVisual: true, contentType: 'image/svg+xml' });
	const win = jsdom.window;

	const [svgElemsRoot, svgElemsMain] = Array.from(win.document.getElementsByTagName('svg'));
	if (typeof svgElemsRoot === 'undefined') {
		return '';
	}

	if (typeof svgElemsMain === 'undefined') {
		return '';
	}

	// svgElemsRoot.getAttributeNames().forEach((a) => {
	// 	const attr = svgElemsRoot.getAttribute(a);
	// 	if (!attr) {
	// 		return;
	// 	}
	// 	svgElemsMain.setAttribute(a, attr);
	// });

	Array.from(svgElemsRoot.children).forEach((h) => {
		if (h !== svgElemsMain) {
			h.remove();
			if (h.tagName.toLowerCase() === 'desc') {
				return;
			}
			if (svgElemsMain.children[0]) {
				svgElemsMain.insertBefore(h, svgElemsMain.children[0]);
				return;
			}
			svgElemsMain.appendChild(h);
		}
	});

	Array.from(win.document.getElementsByClassName('pgHead')).forEach(h => {
		h.remove();
	});

	Array.from(win.document.getElementsByClassName('pgFoot')).forEach(h => {
		h.remove();
	});

	Array.from(win.document.getElementsByTagName('defs')).forEach(h => {
		h.remove();
		if (svgElemsMain) {
			if (svgElemsMain.children[0]) {
				svgElemsMain.insertBefore(h, svgElemsMain.children[0]);
			} else {
				svgElemsMain.appendChild(h);
			}
		}
	});

	return `<?xml version="1.0" encoding="utf-8"?>${svgElemsMain.outerHTML}`
};

export const GET: APIRoute = async ({ params }) => {
	const verovioModule = await createVerovioModule();
	const score = await readFile(`public/scores/${params.asset}.musicxml`, 'utf-8');
	const verovioToolkit = new VerovioToolkit(verovioModule);
	const filteredScore = filter(score);
	const isSuccessful = verovioToolkit.loadData(filteredScore);
	if (!isSuccessful) {
		return new Response(null, { status: 500 });
	}

	verovioToolkit.setOptions({
		breaks: 'none',
		font: 'Bravura',
	});

	let data: string;
	try {
		const raw = verovioToolkit.renderToSVG(1)
			.replace(/xmlns:mei="(.+?)"/g, '')
			.replace(/xlink:/g, '');
		data = processOutput(raw);
	} catch (err) {
		console.error(err);
		return new Response(null, { status: 500 });
	}

	return new Response(
		data,
		{
			headers: {
				'Content-Type': 'image/svg+xml',
			},
			status: 200,
		}
	);
};

export const getStaticPaths: GetStaticPaths = async () => {
	const files = await readdir('public/scores');
	return files
		.filter((f) => f.endsWith('.musicxml'))
		.map((f) => ({
			params: {
				asset: f.replace(/\.musicxml/g, ''),
			},
		}));
};