Function parseNamedType

src/parser/syntaxes/types.ts:153–176

* ```abnf * NamedType = IDENT ["<" Type ">"] * ```

(s: ITokenStream)

 * ```
*/
function parseNamedType(s: ITokenStream): Ast.TypeSource {
	const startPos = s.getPos();

	let name: string;
	if (s.is(TokenKind.Identifier)) {
		name = s.getTokenValue();
		s.next();
	} else {
		s.expect(TokenKind.NullKeyword);
		s.next();
		name = 'null';
	}

	// inner type
	let inner: Ast.TypeSource | undefined;
	if (s.is(TokenKind.Lt)) {
		s.next();
		inner = parseType(s);
		s.expect(TokenKind.Gt);
		s.next();
	}

	return NODE('namedTypeSource', { name, inner }, startPos, s.getPos());
}