package cenas

object Payload {
  def unapply(z: List[Int]): Option[List[Int]] = if (z.length == z.head + 1) Option(z tail) else None
}

object EndToken {
  def unapply(z: List[Int]): Option[List[Int]] = z.reverse match {
    case 0x0D :: 0x0A :: tail => Option(tail.reverse)
    case _ => None
  }
}

object Message {
  def unapply(z: List[Int]): Option[List[Int]] = z match {
    case 0xFC :: EndToken(x) => Option(x)
    case _ => None
  }
}

object Main extends App {
  val x = List(0xFC, 0x03, 0x01, 0x02, 0x03, 0x0A, 0x0D)

  x match {
    case Message(Payload(payload)) => println (payload)
    case _ => println("No match")
  }
}