progs/app51.scala
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Sun, 01 Dec 2013 09:58:41 +0000
changeset 215 828303e8e4af
parent 93 4794759139ea
child 261 24531cfaa36a
permissions -rw-r--r--
updated slides

abstract class Rexp

case object NULL extends Rexp
case object EMPTY 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