Function tokenRoundtrip

test/walkCssTokens.unittest.js:116–129

(input)

 * @returns {string} input reconstructed from token source slices
 */
const tokenRoundtrip = (input) => {
	let out = "";
	for (let pos = 0; ; ) {
		const t = readToken(
			input,
			pos,
			/** @type {import("../lib/css/syntax").MutableToken} */ ({})
		);
		if (t === undefined) break;
		pos = t.end;
		out += input.slice(t.start, t.end);
	}
	return out;
};

// Regressions from the css-parsing-tests corpus: each input previously hung
// the parser or dropped bytes from the token stream.