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Use const fn instead of recursive macro

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Dániel Buga 2021-01-22 12:56:41 +01:00 committed by Wez Furlong
parent a5ae7cef69
commit 8a1bf9697c
1 changed files with 12 additions and 33 deletions
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45
vtparse/src/transitions.rs
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@ -49,40 +49,19 @@ macro_rules! define_function {
/// Apply all u8 values to `fn(u8) -> u8`, return `[u8; 256]`.
macro_rules! define_table {
( $func:tt ) => {
define_table!( func=$func result=[] iter=(0) remaining=[i i i i i i i i i i i i i i i i] )
};
( $func:tt ) => {{
const fn gen() -> [u8; 256] {
let mut arr = [0; 256];
( func=$func:tt result=[$($result:tt)*] iter=($($iter:tt)*) remaining=[]) => {
[ $($result, )* ]
};
( func=$func:tt result=[$($result:tt)*] iter=($($iter:tt)*) remaining=[i $($remaining:tt)*]) => {
define_table! (
func=$func
result=[
$($result)*
($func($($iter)*))
($func($($iter)* + 1))
($func($($iter)* + 2))
($func($($iter)* + 3))
($func($($iter)* + 4))
($func($($iter)* + 5))
($func($($iter)* + 6))
($func($($iter)* + 7))
($func($($iter)* + 8))
($func($($iter)* + 9))
($func($($iter)* + 10))
($func($($iter)* + 11))
($func($($iter)* + 12))
($func($($iter)* + 13))
($func($($iter)* + 14))
($func($($iter)* + 15))
]
iter=($($iter)*+16)
remaining=[$($remaining)*]
)
};
let mut i = 0;
while i < 256 {
arr[i] = $func(i as u8);
i += 1;
}
return arr;
}
gen()
}};
}
/// An alternative form of `Option<u8>` that works with const_fn.