Function parseIcssImportRequest

lib/css/CssParser.js:773–799

(second, rule, source)

 * @returns {{ request: string } | { errorPos: number }} the unquoted request, or the position for the parse warning
 */
const parseIcssImportRequest = (second, rule, source) => {
	/** @type {AstNode[] | undefined} */
	let args;
	if (A.type(second) === NodeType.Function) {
		args = A.children(second);
	} else {
		for (const p of A.prelude(rule)) {
			if (A.type(p) === NodeType.SimpleBlock && A.blockToken(p) === "(") {
				args = A.children(p);
				break;
			}
		}
	}
	// The first non-whitespace value inside `(...)` must be a string.
	const innerStrToken =
		args && args.find((v) => A.type(v) !== NodeType.Whitespace);
	if (!innerStrToken || A.type(innerStrToken) !== NodeType.String) {
		const errorPos =
			A.type(second) === NodeType.Function
				? A.nameEnd(second) + 1
				: A.end(second);
		return { errorPos };
	}
	return {
		request: source.slice(A.start(innerStrToken) + 1, A.end(innerStrToken) - 1)
	};
};

class CssParser extends Parser {
	/**