/
ConfiguredEnumEncoder.scala
41 lines (36 loc) · 1.69 KB
/
ConfiguredEnumEncoder.scala
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/*
* Copyright 2024 circe
*
* 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 io.circe.derivation
import scala.deriving.Mirror
import scala.compiletime.constValue
import Predef.genericArrayOps
import io.circe.{ Encoder, Json }
trait ConfiguredEnumEncoder[A] extends Encoder[A]
object ConfiguredEnumEncoder:
private def of[A](
labels: List[String]
)(using conf: Configuration, mirror: Mirror.SumOf[A]): ConfiguredEnumEncoder[A] =
new ConfiguredEnumEncoder[A]:
private val labelOf = labels.toArray.map(conf.transformConstructorNames)
def apply(a: A) = Json.fromString(labelOf(mirror.ordinal(a)))
inline final def derived[A](using conf: Configuration, mirror: Mirror.SumOf[A]): ConfiguredEnumEncoder[A] =
// Only used to validate if all cases are singletons
summonSingletonCases[mirror.MirroredElemTypes, A](constValue[mirror.MirroredLabel])
ConfiguredEnumEncoder.of[A](summonLabels[mirror.MirroredElemLabels])
inline final def derive[A: Mirror.SumOf](
transformConstructorNames: String => String = Configuration.default.transformConstructorNames
): Encoder[A] =
derived[A](using Configuration.default.withTransformConstructorNames(transformConstructorNames))