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object Test {
sealed abstract class JValue {
def ++(other: JValue) = {
def append(value1: JValue, value2: JValue): JValue = (value1, value2) match {
case (JNothing, x) => x
case (x, JNothing) => x
case (JObject(xs), x: JField) => JObject(xs ::: List(x))
case (x: JField, JObject(xs)) => JObject(x :: xs)
case (JArray(xs), JArray(ys)) => JArray(xs ::: ys)
case (JArray(xs), v: JValue) => JArray(xs ::: List(v))
case (v: JValue, JArray(xs)) => JArray(v :: xs)
case (f1: JField, f2: JField) => JObject(f1 :: f2 :: Nil)
case (JField(n, v1), v2: JValue) => JField(n, append(v1, v2))
case (x, y) => JArray(x :: y :: Nil)
}
append(this, other)
}
}
case object JNothing extends JValue
case object JNull extends JValue
case class JString(s: String) extends JValue
case class JDouble(num: Double) extends JValue
case class JInt(num: BigInt) extends JValue
case class JBool(value: Boolean) extends JValue
case class JField(name: String, value: JValue) extends JValue
case class JObject(obj: List[JField]) extends JValue
case class JArray(arr: List[JValue]) extends JValue
}
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