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TypeDsl.scala
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TypeDsl.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 gql.ast._
import cats.data._
import cats._
import scala.reflect.ClassTag
trait TypeDsl[F[_]] {
def tpe[A](name: String, hd: (String, Field[F, A, ?]), tl: (String, Field[F, A, ?])*) =
TypeDsl.tpe(name, hd, tl: _*)
def tpeNel[A](name: String, entries: Fields[F, A]) =
TypeDsl.tpeNel(name, entries)
implicit def typeDslTypeOps[A](tpe: Type[F, A]): TypeDsl.TypeOps[F, A] =
TypeDsl.typeDslFullTypeOps[F, A](tpe)
}
trait TypeDslFull {
def tpe[F[_], A](name: String, hd: (String, Field[F, A, ?]), tl: (String, Field[F, A, ?])*) =
Type[F, A](name, NonEmptyList(hd, tl.toList), Nil)
def tpeNel[F[_], A](name: String, entries: Fields[F, A]) = Type[F, A](name, entries, Nil)
implicit def typeDslFullTypeOps[F[_], A](tpe: Type[F, A]): TypeDsl.TypeOps[F, A] = new TypeDsl.TypeOps(tpe)
}
object TypeDsl extends TypeDslFull {
def apply[F[_]]: TypeDsl[F] = new TypeDsl[F] {}
final class TypeOps[F[_], A](private val tpe: Type[F, A]) extends AnyVal {
def implements[B](pf: PartialFunction[B, A])(implicit interface: => Interface[F, B]): Type[F, A] =
tpe.copy(implementations = Implementation(Eval.later(interface))(pf.lift) :: tpe.implementations)
def subtypeOf[B](implicit ev: A <:< B, tag: ClassTag[A], interface: => Interface[F, B]): Type[F, A] =
implements[B] { case a: A => a }(interface)
def addFields(xs: (String, Field[F, A, ?])*): Type[F, A] =
tpe.copy(fields = tpe.fields concat xs.toList)
def addFieldsNel(xs: NonEmptyList[(String, Field[F, A, ?])]): Type[F, A] =
addFields(xs.toList: _*)
def subtypeImpl[B](implicit ev: A <:< B, tag: ClassTag[A], interface: => Interface[F, B]): Type[F, A] = {
val existingConcretes = tpe.fields.map { case (k, _) => k }.toList.toSet
val concretes = interface.fields.collect {
case (k, f: gql.ast.Field[F, B, x]) if !existingConcretes.contains(k) =>
(k, f.contramap[F, A](ev(_)))
}
subtypeOf[B](ev, tag, interface).addFields(concretes: _*)
}
}
}