// Copyright (c) Microsoft Corporation. All rights reserved. // Licensed under the MIT license. package com.mojang.datafixers.optics; import com.mojang.datafixers.FunctionType; import com.mojang.datafixers.kinds.App; import com.mojang.datafixers.kinds.App2; import com.mojang.datafixers.kinds.K2; import com.mojang.datafixers.optics.profunctors.Cartesian; import com.mojang.datafixers.optics.profunctors.ReCocartesian; import com.mojang.datafixers.util.Either; import com.mojang.datafixers.util.Pair; import java.util.function.Function; public interface Forget<R, A, B> extends App2<Forget.Mu<R>, A, B> { final class Mu<R> implements K2 {} static <R, A, B> Forget<R, A, B> unbox(final App2<Mu<R>, A, B> box) { return (Forget<R, A, B>) box; } R run(final A a); final class Instance<R> implements Cartesian<Mu<R>, Instance.Mu<R>>, ReCocartesian<Mu<R>, Instance.Mu<R>>, App<Instance.Mu<R>, Mu<R>> { public static final class Mu<R> implements Cartesian.Mu, ReCocartesian.Mu {} @Override public <A, B, C, D> FunctionType<App2<Forget.Mu<R>, A, B>, App2<Forget.Mu<R>, C, D>> dimap(final Function<C, A> g, final Function<B, D> h) { return input -> Optics.forget(c -> Forget.unbox(input).run(g.apply(c))); } @Override public <A, B, C> App2<Forget.Mu<R>, Pair<A, C>, Pair<B, C>> first(final App2<Forget.Mu<R>, A, B> input) { return Optics.forget(p -> Forget.unbox(input).run(p.getFirst())); } @Override public <A, B, C> App2<Forget.Mu<R>, Pair<C, A>, Pair<C, B>> second(final App2<Forget.Mu<R>, A, B> input) { return Optics.forget(p -> Forget.unbox(input).run(p.getSecond())); } @Override public <A, B, C> App2<Forget.Mu<R>, A, B> unleft(final App2<Forget.Mu<R>, Either<A, C>, Either<B, C>> input) { return Optics.forget(a -> Forget.unbox(input).run(Either.left(a))); } @Override public <A, B, C> App2<Forget.Mu<R>, A, B> unright(final App2<Forget.Mu<R>, Either<C, A>, Either<C, B>> input) { return Optics.forget(a -> Forget.unbox(input).run(Either.right(a))); } } }