1 // Detokenising the ouput of Tokeniser

     2 //=====================================

     3 //

     4 // call with 

     5 //

     6 //     scala detokenise.scala fib.tks

     7 //

     8 //     scala detokenise.scala loops.tks

     9 

    10 object Detokenise {

    11 

    12 import java.io._

    13 import scala.util._ 

    14 

    15 abstract class Token extends Serializable 

    16 case object T_SEMI extends Token

    17 case object T_LPAREN extends Token

    18 case object T_RPAREN extends Token

    19 case class T_ID(s: String) extends Token

    20 case class T_OP(s: String) extends Token

    21 case class T_NUM(n: Int) extends Token

    22 case class T_KWD(s: String) extends Token

    23 case class T_STR(s: String) extends Token

    24 

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

    26   //import scala.util.Using

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

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

    29   //}

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

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

    32   }

    33 }

    34 

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

    36   val fname = args(0)

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

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

    39 }

    40 

    41 

    42 }