def annotationTypeMacro[T: c.WeakTypeTag]()

in shared/src/main/scala-2/magnolify/shared/AnnotationTypeMacros.scala [22:44]

• 15 lines of code
• 4 McCabe index (conditional complexity)

  def annotationTypeMacro[T: c.WeakTypeTag](c: whitebox.Context): c.Tree = {
    import c.universe._
    val wtt = weakTypeTag[T]
    val pre = wtt.tpe.asInstanceOf[TypeRef].pre

    // Scala 2.12 & 2.13 macros seem to handle annotations differently
    // Scala annotation works in both but Java annotations only works in 2.13
    val saType = typeOf[scala.annotation.StaticAnnotation]
    val jaType = typeOf[java.lang.annotation.Annotation]
    // Annotation for Scala enumerations are on the outer object
    val annotated = if (pre <:< typeOf[scala.Enumeration]) pre else wtt.tpe
    val trees = annotated.typeSymbol.annotations.map(_.tree).collect {
      case t @ q"new $n(..$args)" if t.tpe <:< saType && !(t.tpe <:< jaType) =>
        // FIXME `t.tree` should work but somehow crashes the compiler
        q"new $n(..$args)"
    }

    // Get Java annotations via reflection
    val j = q"classOf[${annotated.typeSymbol.asClass}].getAnnotations.toList"
    val annotations = q"_root_.scala.List(..$trees) ++ $j"

    q"_root_.magnolify.shared.AnnotationType[$wtt]($annotations)"
  }