Automatic code generation for Scala functions and expressions via the Curry-Howard isomorphism
License: Apache License 2.0
The Chymyst project is an application framework and library for developing general concurrent applications in Scala.
This project uses the Chymyst Core library, which implements the chemical machine paradigm of concurrency.
"Invalid head type in application" error. It seems that some function arguments are mixed up when using case classes with zero arguments.
Two examples where that happens:
sealed trait JohnsCoupons[A]
final case class John0[A]() extends JohnsCoupons[A]
final case class John1[A](c1: A) extends JohnsCoupons[A]
final case class John2[A](c1: A, c2: A) extends JohnsCoupons[A]
final case class John3[A](c1: A, c2: A, c3: A) extends JohnsCoupons[A]
sealed trait JillsCoupons[A]
final case class Jill0[A]() extends JillsCoupons[A]
final case class Jill1[A](c1: A) extends JillsCoupons[A]
final case class Jill2[A](c1: A, c2: A) extends JillsCoupons[A]
type Coupons[A] = (JohnsCoupons[A], JillsCoupons[A])
def fmap[A, B]: (A ⇒ B) ⇒ Coupons[A] ⇒ Coupons[B] = implement
// Internal error: Invalid head type in applicationand a simpler example,
sealed trait F[Z, A]
final case class Empty[Z, A]() extends F[Z, A]
final case class HaveZ[Z, A](z: Z) extends F[Z, A]
def map[A, B](fa: F[Z, A])(f: A ⇒ B): F[Z, B] = implementUsing a case object instead of a case class Empty() seems to work.
E.g. Either and List have different accessor names. The fix: make tests insensitive to these names.
ofType[ Future[Seq[Try[Int]]] => Future[Seq[Try[Int]]] ]should generate an identity function, but currently does not compile. Most likely because the ConstructorT is not instantiated with correct type parameters.
Examples where curryhoward's present heuristics do not generate the expected code:
type P[T] = (Option[T], Option[T])
def fmap[A, B](f: A => B): P[A] => P[B] = implement
def flatten[A]: P[Option[A]] => P[A] = implementWhen generating a function such as Option[A] => Option[A], the preferred implementation would be x => x. Sometimes code such as this is generated:
Warning:(141, 89) type (A ⇒ Option[B]{None.type + Some[B]}) ⇒ (B ⇒ Option[C]{None.type + Some[C]}) ⇒ A ⇒ Option[C]{None.type + Some[C]} has 2 implementations (laws need checking?):
a ⇒ b ⇒ c ⇒ a c match { d ⇒ (None() + 0); e ⇒ b e.value } [score: (0,0.5,0.0,0,0)];
a ⇒ b ⇒ c ⇒ (None() + 0) [score: (3,0.0,0.0,0,0)].
def kleisliOptCompose[A, B, C](f: A ⇒ Option[B], g: B ⇒ Option[C]): A ⇒ Option[C] = implementIt is better to generate code such as x match { d => d }; ... instead of x match { d => None() + 0 }; ... when d is itself already None(). This code would have a lower information loss score.
The term a ⇒ Tuple2(a._1._1, a._1._2) of type "Tuple2[Tuple2[A,A],Tuple2[A,A]] ⇒ Tuple2[A,A]" is identical to the term a ⇒ a._1 of the same type, but the simplifier does not notice.
This leads to
type Pair[A] = (A, A)
def flatten[A] = anyOfType[Pair[Pair[A]] ⇒ Pair[A]]().map(_.lambdaTerm)
flatten[Int].length == 18 // should be 16
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