pipez.internal.PlatformAnyValCaseGeneration.scala Maven / Gradle / Ivy
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package pipez.internal
import scala.language.existentials
private[internal] trait PlatformAnyValCaseGeneration[Pipe[_, _], In, Out] extends AnyValCaseGeneration[Pipe, In, Out] {
self: PlatformDefinitions[Pipe, In, Out] & PlatformGenerators[Pipe, In, Out] =>
import c.universe.*
final def isAnyVal[A: Type]: Boolean =
isSubtype[A, AnyVal]
final def isPrimitive[A: Type]: Boolean =
isSubtype[A, Boolean] || isSubtype[A, Byte] || isSubtype[A, Char] || isSubtype[A, Int] || isSubtype[A, Long] ||
isSubtype[A, Short] || isSubtype[A, Double] || isSubtype[A, Float] || isSubtype[A, String]
final def extractAnyValInData(settings: Settings): DerivationResult[AnyValInData[AnyValType]] =
if (isAnyVal[In])
DerivationResult.fromOption(
In.decls.to(List).filterNot(isGarbage).find(field => field.isMethod && field.asMethod.isGetter).map { getter =>
val name = getter.name.toString
val termName = getter.asMethod.name.toTermName
AnyValInData.InAnyVal(
tpe = returnTypeOf(In, getter).asInstanceOf[Type[AnyValType]],
get =
if (getter.asMethod.paramLists.isEmpty) (in: Expr[In]) => c.Expr[AnyValType](q"$in.$termName")
else (in: Expr[In]) => c.Expr[AnyValType](q"$in.$termName()"),
path = Path.Field(Path.Root, name)
)
}
)(DerivationError.InvalidInput("Couldn't found a valid getter to extract value from AnyVal"))
else
DerivationResult.pure(AnyValInData.InPrimitive(typeOf[In].asInstanceOf[Type[AnyValType]]))
final def extractAnyValOutData(settings: Settings): DerivationResult[AnyValOutData[AnyValType]] =
if (isAnyVal[Out])
DerivationResult
.fromOption(
Out.decls
.to(List)
.filterNot(isGarbage)
.find(m => m.isPublic && m.isConstructor && m.asMethod.paramLists.flatten.size == 1)
)(DerivationError.MissingPublicConstructor)
.map { primaryConstructor =>
val arg = primaryConstructor.asMethod.paramLists.flatten.head
AnyValOutData.OutAnyVal(
tpe = arg.typeSignature.asInstanceOf[Type[AnyValType]],
put = (value: Expr[AnyValType]) => c.Expr[Out](q"new $Out($value)")
)
}
else
DerivationResult.pure(AnyValOutData.OutPrimitive(typeOf[Out].asInstanceOf[Type[AnyValType]]))
final def generateAnyValCode(generatorData: AnyValGeneratorData): DerivationResult[Expr[Pipe[In, Out]]] = {
val in = c.freshName(TermName("in"))
DerivationResult.pure(
lift[In, Out](c.Expr(q"""($in: $In, _: $Context) => ${pureResult(generatorData.repack(c.Expr(q"$in")))}"""))
)
}
}