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| fn main() -> ! { | |
| let (mut delay, mut leds): (Delay, Leds) = aux5::init(); | |
| loop { | |
| foreach!($ | |
| state => [on off] | |
| period => [500 100] | |
| { | |
| for led in 0..8 { | |
| leds[led].$state(); | |
| } | |
| delay.delay_ms($period as u16); | |
| }); | |
| } | |
| } |
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| macro_rules! foreach { | |
| (@go | |
| () -> | |
| ([$($name:ident)*] [$([$($variant:tt)*])*]) | |
| [$d:tt { $($body:tt)* }] | |
| ) => {{ | |
| macro_rules! __foreach_substitute { | |
| ($($d$name:tt)*) => { | |
| $($body)* | |
| } | |
| } | |
| $(__foreach_substitute!($($variant)*);)* | |
| }}; | |
| (@go | |
| ($name:ident => [$($variant:tt)*] $($rest:tt)*) -> | |
| ([$($names:tt)*] [$([$($variants:tt)*])*]) | |
| $thru:tt | |
| ) => { | |
| foreach!(@go | |
| ($($rest)*) -> | |
| ([$($names)* $name] [$([$($variants)* $variant])*]) | |
| $thru); | |
| }; | |
| ( | |
| $d:tt | |
| $name:ident => [$($variant:tt)*] | |
| $($names:ident => [$($variants:tt)*])* | |
| { $($body:tt)* } | |
| ) => { | |
| foreach!(@go | |
| ($($names => [$($variants)*])*) -> | |
| ([$name] [$([$variant])*]) | |
| [$d { $($body)* }]); | |
| } | |
| } |
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