progs/app01.scala
author Christian Urban <urbanc@in.tum.de>
Sun, 22 Mar 2020 14:21:33 +0000
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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