progs/app01.scala
author cu
Sun, 15 Oct 2017 20:47:14 +0100
changeset 519 955d5b3b0619
parent 400 e4afe3f46c29
permissions -rw-r--r--
updated

abstract class Rexp
case object ZERO extends Rexp
case object ONE extends Rexp
case class CHAR(c: Char) extends Rexp
case class ALT(r1: Rexp, r2: Rexp) extends Rexp 
case class SEQ(r1: Rexp, r2: Rexp) extends Rexp 
case class STAR(r: Rexp) extends Rexp