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Add recover either #506

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Add recover either #506

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3093d23
Add recover either
geirolz Mar 11, 2024
3a98b5d
Downgrade to ApplicativeError
geirolz Jul 20, 2024
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14 changes: 11 additions & 3 deletions shared/src/main/scala/mouse/anyf.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,7 @@ package mouse

import cats.data.EitherT
import cats.data.OptionT
import cats.~>
import cats.Functor
import cats.{ApplicativeError, Functor, MonadError, ~>}

trait AnyFSyntax {
implicit final def anyfSyntaxMouse[F[_], A](fa: F[A]): AnyFOps[F, A] = new AnyFOps(fa)
Expand All @@ -49,4 +48,13 @@ final class AnyFOps[F[_], A](private val fa: F[A]) extends AnyVal {
def liftOptionT(implicit F: Functor[F]): OptionT[F, A] =
OptionT.liftF(fa)

}
// applicativeError
def recoverAsLeft[E, L](pf: PartialFunction[E, L])(implicit F: ApplicativeError[F, E]): F[Either[L, A]] =
recoverEither(pf.andThen(Left(_)))

def recoverAsRight[E](pf: PartialFunction[E, A])(implicit F: ApplicativeError[F, E]): F[Either[Nothing, A]] =
recoverEither(pf.andThen(Right(_)))

def recoverEither[E, L](pf: PartialFunction[E, Either[L, A]])(implicit F: ApplicativeError[F, E]): F[Either[L, A]] =
F.recover(mapAsRight[L])(pf)
Comment on lines +58 to +59
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When #508 is published, It can be used as a counterpart:

val fa: F[Unit] = ???

fa.attempt.leftFlatMapOrKeepIn(pf)

But if we take allocations into consideration, it's probably better to have a distinct syntax for that.

}
57 changes: 54 additions & 3 deletions shared/src/test/scala/mouse/AnyFSyntaxTest.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,11 @@ package mouse

import cats.data.EitherT
import cats.data.OptionT
import cats.syntax.option._
import cats.syntax.either._
import cats.{~>, Id}
import cats.syntax.option.*
import cats.syntax.either.*
import cats.{Id, ~>}

import scala.util.{Success, Try}

class AnyFSyntaxTest extends MouseSuite {
private val emptyK = new (List ~> List) {
Expand Down Expand Up @@ -75,6 +77,55 @@ class AnyFSyntaxTest extends MouseSuite {
assertEquals(List(1).mapAsSome, List(1.some))
}

test("AnyFSyntax.recoverEither") {
assertEquals(
Try[Int](1).recoverEither {
case _: Throwable => Right(2)
},
Success(1.asRight)
)

assertEquals(
Try[Int](throw new RuntimeException("boom")).recoverEither {
case _: Throwable => Right(2)
},
Success(2.asRight)
)
}


test("AnyFSyntax.recoverAsRight") {
assertEquals(
Try[Int](1).recoverAsRight {
case _: Throwable => 2
},
Success(1.asRight)
)

assertEquals(
Try[Int](throw new RuntimeException("boom")).recoverAsRight {
case _: Throwable => 2
},
Success(2.asRight)
)
}

test("AnyFSyntax.recoverAsLeft") {
assertEquals(
Try(1).recoverAsLeft {
case _: Throwable => "foo"
},
Success(1.asRight)
)

assertEquals(
Try(throw new RuntimeException("boom")).recoverAsLeft {
case _: Throwable => "error"
},
Success("error".asLeft)
)
}

test("AnyFSyntax.liftEitherT") {
assertEquals(List(1).liftEitherT[String], EitherT(List(1.asRight[String])))
}
Expand Down
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