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UnionDsl.scala
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UnionDsl.scala
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/*
* Copyright 2023 Valdemar Grange
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gql.dsl
import cats.implicits._
import gql.ast._
import cats.data._
import cats._
import scala.reflect.ClassTag
trait UnionDsl[F[_]] {
def union[A](name: String): UnionDsl.PartiallyAppliedUnion0[F, A] =
UnionDsl.union[F, A](name)
implicit def unionDslUnionOps[A](u: Union[F, A]): UnionDsl.UnionOps[F, A] =
UnionDsl.unionDslFullUnionOps[F, A](u)
}
trait UnionDslFull {
def union[F[_], A](name: String): UnionDsl.PartiallyAppliedUnion0[F, A] =
new UnionDsl.PartiallyAppliedUnion0[F, A](name)
implicit def unionDslFullUnionOps[F[_], A](u: Union[F, A]): UnionDsl.UnionOps[F, A] =
new UnionDsl.UnionOps[F, A](u)
}
object UnionDsl extends UnionDslFull {
final class PartiallyAppliedUnion0[F[_], A](private val name: String) extends AnyVal {
def variant[B](pf: PartialFunction[A, B])(implicit innerTpe: => Type[F, B]): PartiallyAppliedUnion1[F, A] =
new PartiallyAppliedUnion1[F, A](name, Variant[F, A, B](Eval.later(innerTpe))(pf.lift.andThen(_.rightIor)))
def subtype[B: ClassTag](implicit ev: B <:< A, innerTpe: => Type[F, B]): PartiallyAppliedUnion1[F, A] =
variant[B] { case a: B => a }(innerTpe)
}
final class PartiallyAppliedUnion1[F[_], A](private val name: String, private val hd: Variant[F, A, ?]) {
def variant[B](pf: PartialFunction[A, B])(implicit innerTpe: => Type[F, B]): Union[F, A] =
Union[F, A](name, NonEmptyList.of(hd, Variant[F, A, B](Eval.later(innerTpe))(pf.lift.andThen(_.rightIor))), None)
def subtype[B: ClassTag](implicit ev: B <:< A, innerTpe: => Type[F, B]): Union[F, A] =
variant[B] { case a: B => a }(innerTpe)
}
final case class UnionOps[F[_], A](private val u: Union[F, A]) extends AnyVal {
def variant[B](pf: PartialFunction[A, B])(implicit innerTpe: => Type[F, B]): Union[F, A] =
u.copy(types = Variant[F, A, B](Eval.later(innerTpe))(pf.lift.andThen(_.rightIor)) :: u.types)
def subtype[B: ClassTag](implicit ev: B <:< A, innerTpe: => Type[F, B]): Union[F, A] =
variant[B] { case a: B => a }(innerTpe)
}
}