progs/app03.scala
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Wed, 06 Apr 2016 12:18:54 +0100
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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abstract class Rexp
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case object ZERO extends Rexp
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case object ONE extends Rexp
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case class CHAR(c: Char) extends Rexp
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case class ALT(r1: Rexp, r2: Rexp) extends Rexp 
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case class SEQ(r1: Rexp, r2: Rexp) extends Rexp 
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case class STAR(r: Rexp) extends Rexp 
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case class REC(x: String, r: Rexp) extends Rexp