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Arg.scala
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Arg.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
import cats.data._
import cats._
import cats.implicits._
import gql.ast._
final case class Arg[+A](
entries: NonEmptyChain[ArgValue[?]],
decode: Map[String, ArgParam[?]] => Either[String, A]
) {
def emap[B](f: A => Either[String, B]): Arg[B] =
Arg(entries, decode.andThen(_.flatMap(f)))
}
object Arg {
def makeFrom[A, B](av: ArgValue[A])(f: ArgParam[A] => Either[String, B]): Arg[B] =
Arg[B](NonEmptyChain.one(av), m => f(m(av.name).asInstanceOf[ArgParam[A]]))
def make[A](av: ArgValue[A]): Arg[A] =
makeFrom(av)(_.value.asRight)
implicit lazy val applyForArg: Apply[Arg] = new Apply[Arg] {
override def map[A, B](fa: Arg[A])(f: A => B): Arg[B] =
Arg(fa.entries, fa.decode.andThen(_.map(f)))
override def ap[A, B](ff: Arg[A => B])(fa: Arg[A]): Arg[B] =
Arg(ff.entries ++ fa.entries, m => (ff.decode(m), fa.decode(m)).mapN((f, a) => f(a)))
}
}
final case class ArgParam[A](
defaulted: Boolean,
value: A
)
final case class ArgValue[A](
name: String,
input: Eval[In[A]],
defaultValue: Option[Value],
description: Option[String]
) {
def document(description: String) = copy(description = Some(description))
def default(value: Value) = copy(defaultValue = Some(value))
}
object ArgValue {
def make[A](name: String, default: Option[Value] = None, description: Option[String] = None)(implicit in: => In[A]): ArgValue[A] =
ArgValue(name, Eval.later(in), default, description)
}