macro_rules! schemes {
($name:ident {
$([$state:ident, $($match:literal)|+ => $result:ident]$(,)?)*
}
[$($complete:ident),*]) => (
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum $name {
$($result,)*
COMPLETE,
NONE,
}
impl Default for $name {
#[inline]
fn default() -> Self {
$name::NONE
}
}
impl $name {
#[inline]
pub fn advance(self, c: char) -> Self {
match (self, c) {
$($(($name::$state, $match))|+ => $name::$result,)*
$(($name::$complete, ':') => $name::COMPLETE,)*
_ => $name::NONE,
}
}
}
)
}
schemes! {
SchemeState {
[NONE, 'h'|'H' => H],
[H, 't'|'T' => HT],
[HT, 't'|'T' => HTT],
[HTT, 'p'|'P' => HTTP],
[HTTP, 's'|'S' => HTTPS],
[NONE, 'f'|'F' => F],
[F, 't'|'T' => FT],
[FT, 'p'|'P' => FTP],
[F, 'i'|'I' => FI],
[FI, 'l'|'L' => FIL],
[FIL, 'e'|'E' => FILE],
[NONE, 'm'|'M' => M],
[M, 'a'|'A' => MA],
[MA, 'i'|'I' => MAI],
[MAI, 'l'|'L' => MAIL],
[MAIL, 't'|'T' => MAILT],
[MAILT, 'o'|'O' => MAILTO],
[NONE, 'n'|'N' => N],
[N, 'e'|'E' => NE],
[NE, 'w'|'W' => NEW],
[NEW, 's'|'S' => NEWS],
[NONE, 'g'|'G' => G],
[G, 'i'|'I' => GI],
[GI, 't'|'T' => GIT],
[NONE, 's'|'S' => S],
[S, 's'|'S' => SS],
[SS, 'h'|'H' => SSH],
}
[HTTP, HTTPS, FTP, FILE, MAILTO, NEWS, GIT, SSH]
}