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• ValueEnumEntryMacros.scala

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pl.iterators.kebs.macros.enums.ValueEnumEntryMacros.scala Maven / Gradle / Ivy

package pl.iterators.kebs.macros.enums

import enumeratum.values._

import scala.language.experimental.macros
import scala.reflect.macros.blackbox

class ValueEnumOf[ValueType, E <: ValueEnumEntry[ValueType]](val valueEnum: ValueEnum[ValueType, E])

object ValueEnumOf {
  implicit def intValueEnumOf[E <: IntEnumEntry]: ValueEnumOf[Int, E] =
    macro ValueEnumEntryMacros.valueEnumOfImpl[Int, E]
  implicit def shortValueEnumOf[E <: ShortEnumEntry]: ValueEnumOf[Short, E] =
    macro ValueEnumEntryMacros.valueEnumOfImpl[Short, E]
  implicit def longValueEnumOf[E <: LongEnumEntry]: ValueEnumOf[Long, E] =
    macro ValueEnumEntryMacros.valueEnumOfImpl[Long, E]
  implicit def byteValueEnumOf[E <: ByteEnumEntry]: ValueEnumOf[Byte, E] =
    macro ValueEnumEntryMacros.valueEnumOfImpl[Byte, E]
  implicit def stringValueEnumOf[E <: StringEnumEntry]: ValueEnumOf[String, E] =
    macro ValueEnumEntryMacros.valueEnumOfImpl[String, E]
}

/**
  * this needs to be whitebox because macro needs to deduce `ValueType` type param
  */
class ValueEnumEntryMacros(override val c: blackbox.Context) extends EnumMacroUtils {
  import c.universe._

  def valueEnumOfImpl[ValueType: c.WeakTypeTag, E <: ValueEnumEntry[ValueType]: c.WeakTypeTag]: c.Expr[ValueEnumOf[ValueType, E]] = {
    val EnumEntry = weakTypeOf[E]
    assertValueEnumEntry(EnumEntry, s"${EnumEntry.typeSymbol} must subclass enumeratum.values.ValueEnumEntry")

    val ValueType = weakTypeOf[ValueType]
    c.Expr[ValueEnumOf[ValueType, E]](
      q"new _root_.pl.iterators.kebs.macros.enums.ValueEnumOf[$ValueType, $EnumEntry](${companion(EnumEntry)})")
  }
}