// Detokenising the ouput of Tokeniser

//=====================================

//

// call with 

//

//     scala detokenise.scala fib.tks

//

//     scala detokenise.scala loops.tks

object Detokenise {

import java.io._

import scala.util._ 

abstract class Token extends Serializable 

case object T_SEMI extends Token

case object T_LPAREN extends Token

case object T_RPAREN extends Token

case class T_ID(s: String) extends Token

case class T_OP(s: String) extends Token

case class T_NUM(n: Int) extends Token

case class T_KWD(s: String) extends Token

case class T_STR(s: String) extends Token

def deserialise[T](fname: String) : Try[T] = {

  //import scala.util.Using

  //Using(new ObjectInputStream(new FileInputStream(fname))) {

  //  in => in.readObject.asInstanceOf[T]

  //}

  Try(new ObjectInputStream(new FileInputStream(fname))).get {

    in => in.readObject.asInstanceOf[T]

  }

}

def main(args: Array[String]) = {

  val fname = args(0)

  val tks = deserialise[List[Token]](fname).getOrElse(Nil)

  println(s"Reading back from ${fname}:\n${tks.mkString(", ")}")  

}

}