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Override getAndDiscreteUpdates for Monad[Signal] #211

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Merged
armanbilge merged 2 commits into from
Feb 22, 2023
Merged

Override getAndDiscreteUpdates for Monad[Signal] #211

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c91396b
Override `getAndDiscreteUpdates` for signal `ap`
armanbilge Feb 22, 2023
1761eb4
Override `getAndDiscreteUpdates` for signal `flatMap`
armanbilge Feb 22, 2023
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18 changes: 18 additions & 0 deletions frp/src/main/scala/calico/frp/frp.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ import cats.Monad
import cats.StackSafeMonad
import cats.data.OptionT
import cats.effect.kernel.Concurrent
import cats.effect.kernel.Resource
import cats.syntax.all.*
import fs2.Pull
import fs2.Stream
Expand All @@ -57,6 +58,14 @@ given [F[_]: Concurrent]: Monad[Signal[F, _]] = new StackSafeMonad[Signal[F, _]]
def get = siga.get.flatMap(f(_).get)
def continuous = Stream.repeatEval(get)
def discrete = siga.discrete.switchMap(f(_).discrete)
override def getAndDiscreteUpdates(using Concurrent[F]) =
getAndDiscreteUpdatesImpl
private def getAndDiscreteUpdatesImpl =
siga.getAndDiscreteUpdates.flatMap { (a, as) =>
f(a).getAndDiscreteUpdates.map { (b, bs) =>
(b, (Stream.emit(bs) ++ as.map(f(_).discrete)).switchMap(identity(_)))
}
}

override def ap[A, B](ff: Signal[F, A => B])(fa: Signal[F, A]) =
new:
Expand All @@ -65,6 +74,15 @@ given [F[_]: Concurrent]: Monad[Signal[F, _]] = new StackSafeMonad[Signal[F, _]]
def continuous: Stream[F, B] = Stream.repeatEval(get)
def get: F[B] = ff.get.ap(fa.get)

override def getAndDiscreteUpdates(using Concurrent[F]): Resource[F, (B, Stream[F, B])] =
getAndDiscreteUpdatesImpl

private def getAndDiscreteUpdatesImpl =
(ff.getAndDiscreteUpdates, fa.getAndDiscreteUpdates).mapN {
case ((f, fs), (a, as)) =>
(f(a), nondeterministicZip(fs, as).map { case (f, a) => f(a) })
}

private def nondeterministicZip[A0, A1](
xs: Stream[F, A0],
ys: Stream[F, A1]
Expand Down