scala.xml.dtd.impl.WordExp.scala Maven / Gradle / Ivy
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala
package xml.dtd.impl
/**
* The class `WordExp` provides regular word expressions.
*
* Users have to instantiate type member `_regexpT <;: RegExp`
* (from class `Base`) and a type member `_labelT <;: Label`.
*
* Here is a short example:
* {{{
* import scala.util.regexp._
* import scala.util.automata._
* object MyLang extends WordExp {
* type _regexpT = RegExp
* type _labelT = MyChar
*
* case class MyChar(c:Char) extends Label
* }
* import MyLang._
* // (a* | b)*
* val rex = Star(Alt(Star(Letter(MyChar('a'))),Letter(MyChar('b'))))
* object MyBerriSethi extends WordBerrySethi {
* override val lang = MyLang
* }
* val nfa = MyBerriSethi.automatonFrom(Sequ(rex), 1)
* }}}
*
* @author Burak Emir
* @version 1.0
*/
// TODO: still used in ContentModel -- @deprecated("This class will be removed", "2.10.0")
private[dtd] 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
}
}