Scala example source code file (WordExp.scala)

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Java - Scala tags/keywords

base, base, label, label, letter, regexp, regexp, wildcard, wordexp, wordexp

The Scala WordExp.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.util.regexp

/** <p>
 *    The class <code>WordExp provides regular word expressions.
 *    Users have to instantiate type member <code>_regexpT <: RegExp
 *    (from class <code>Base) and a type member
 *    <code>_labelT <: Label. Here is a short example:
 *  </p>
 *  <b>import scala.util.regexp._
 *  <b>import scala.util.automata._
 *  <b>object MyLang extends WordExp {
 *    <b>type _regexpT = RegExp
 *    <b>type _labelT = MyChar
 *
 *    <b>case class MyChar(c:Char) extends Label
 *  }
 *  <b>import MyLang._
 *  // (a* | b)*
 *  <b>val rex = Star(Alt(Star(Letter(MyChar('a'))),Letter(MyChar('b'))))
 *  <b>object MyBerriSethi extends WordBerrySethi {
 *    <b>override val lang = MyLang
 *  }
 *  <b>val nfa = MyBerriSethi.automatonFrom(Sequ(rex), 1)
 *  </pre>
 *
 *  @author  Burak Emir
 *  @version 1.0
 */
abstract class WordExp extends Base {

  abstract class Label

  type _regexpT <: RegExp
  type _labelT <: Label

  case class Letter(a: _labelT) extends RegExp {
    final lazy val isNullable = false
    var pos = -1
  }

  case class Wildcard() extends RegExp {
    final lazy val isNullable = false
    var pos = -1
  }
}



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