class json extends StaticAnnotation {
  def macroTransform(annottees: Any*) = macro impl

  private def impl(c: Context)(annottees: c.Expr[Any]*): c.Expr[Any] = {
    import c.universe._

    def modifiedClass(classDecl: ClassDef, compDeclOpt: Option[ModuleDef]) = {
      // Class modification logic goes here
    }

    annottees.map(_.tree) match {
      case (classDecl: ClassDef) :: Nil => modifiedClass(c, classDecl)
      case (classDecl: ClassDef) :: (compDecl: ModuleDef) :: Nil => modifiedClass(c, classDecl, Some(compDecl))
      case _ => c.abort(c.enclosingPosition, "Invalid annottee")
    }
  }
}