progs/app51.scala
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Tue, 10 Dec 2013 17:48:15 +0000
changeset 225 ef573e8fc86e
parent 93 4794759139ea
child 261 24531cfaa36a
permissions -rw-r--r--
bug found by Andres
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abstract class Rexp
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case object NULL extends Rexp
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case object EMPTY 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