unfmt_match.rs

#[macro_export]
macro_rules! opt_metavar {
	(; $default:tt) => {
		$default
	};
	($opt:tt; $default:tt) => {
		$opt
	};
}

#[macro_export]
macro_rules! unfmt_match {
	(
		$scrutinee:expr;
		$(
			$fmt:literal $(as $pat:pat)? => $arm:expr,
		)*
		$(_ => $fbarm:expr $(,)?)?
	) => {
		#[allow(unused_labels)]
		'unfmt_match: {
			let input = $scrutinee;
			$(

				if let Some($crate::opt_metavar!($($pat)?; ())) = ::unfmt::unformat!($fmt, input, true) {
					break 'unfmt_match ($arm);
				}
			)*
			$(
				$fbarm
			)?
		}
	};
}