106 lines
2.9 KiB
Rust
106 lines
2.9 KiB
Rust
use crate::{
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lenses::{LensOver, LensView},
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Optics, OpticsTrait,
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};
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#[derive(Clone, Copy)]
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pub struct _1Inner;
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pub const _1: Optics<_1Inner> = Optics(_1Inner);
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impl OpticsTrait for _1Inner {}
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macro_rules! make_tuples {
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($f:ident, ( $( $v:ident ),* ), ( $( $t:ident ),* ) ) => {
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impl< $($t,)* > LensView<( $($t,)* )> for _1Inner {
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type Field = T;
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fn view(&self, ( $($v,)* ): ($($t,)*)) -> Self::Field {
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$f
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}
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}
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impl< $($t,)* > LensOver<( $($t,)* )> for _1Inner {
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fn over<F>(
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&self,
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mut tup: ($($t,)*),
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f: F
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) -> ( $($t,)* )
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where
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F: FnOnce(Self::Field) -> Self::Field
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{
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tup.1 = f(tup.1);
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tup
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}
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}
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impl<'a, $($t,)* > LensView<&'a ( $($t,)* )> for _1Inner {
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type Field = &'a T;
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fn view(&self, ( $($v,)* ): &'a ($($t,)*)) -> Self::Field {
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$f
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}
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}
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impl<'a, $($t,)* > LensView<&'a mut ( $($t,)* )> for _1Inner {
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type Field = &'a mut T;
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fn view(&self, ( $($v,)* ): &'a mut ($($t,)*)) -> Self::Field {
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$f
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}
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}
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};
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}
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make_tuples!(t, (_u, t), (U, T));
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make_tuples!(t, (_u, t, _v), (U, T, V));
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make_tuples!(t, (_u, t, _v, _w), (U, T, V, W));
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make_tuples!(t, (_u, t, _v, _w, _x), (U, T, V, W, X));
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make_tuples!(t, (_u, t, _v, _w, _x, _y), (U, T, V, W, X, Y));
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make_tuples!(t, (_u, t, _v, _w, _x, _y, _z), (U, T, V, W, X, Y, Z));
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// not doing more cause i'm lazy, open a pr if you need more :)
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macro_rules! make_arrays {
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($f:ident, $n:expr, [$( $v:ident ),*]) => {
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impl<T> LensView<[T; $n]> for _1Inner {
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type Field = T;
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fn view(&self, [ $($v,)* ]: [T; $n]) -> Self::Field {
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$f
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}
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}
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impl<T> LensOver<[T; $n]> for _1Inner {
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fn over<F>(
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&self,
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tup: [T; $n],
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fun: F
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) -> [T; $n]
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where
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F: FnOnce(Self::Field) -> Self::Field
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{
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let [$($v,)*] = tup;
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let $f = fun( $f );
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[$($v,)*]
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}
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}
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impl<'a, T> LensView<&'a [T; $n]> for _1Inner {
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type Field = &'a T;
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fn view(&self, [ $($v,)* ]: &'a [T; $n]) -> Self::Field {
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$f
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}
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}
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impl<'a, T> LensView<&'a mut [T; $n]> for _1Inner {
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type Field = &'a mut T;
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fn view(&self, [ $($v,)* ]: &'a mut [T; $n]) -> Self::Field {
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$f
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}
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}
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};
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}
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make_arrays!(t, 2, [_a, t]);
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make_arrays!(t, 3, [_a, t, _b]);
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make_arrays!(t, 4, [_a, t, _b, _c]);
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make_arrays!(t, 5, [_a, t, _b, _c, _d]);
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make_arrays!(t, 6, [_a, t, _b, _c, _d, _e]);
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make_arrays!(t, 7, [_a, t, _b, _c, _d, _e, _g]);
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