jpaul.RegExps
Class RegExp.Visitor<A,Res>

java.lang.Object
  jpaul.RegExps.RegExp.Visitor<A,Res>

Enclosing class:

RegExp<A>

public abstract static class RegExp.Visitor<A,Res>
extends java.lang.Object

Instance of the visitor pattern for RegExps. Usage of this pattern avoids clumsy sequences of several instanceof tests. A visitor takers a regular expression over symbols of type A and returns a result of type Res.

Constructor Summary

RegExp.Visitor()

Method Summary

Res	visit(RegExp.Atomic<A> re) Subclasses should override this method to define special processing for an Atomic regular expression.
Res	visit(RegExp.Concat<A> re) Subclasses should override this method to define special processing for a Concat regular expression.
Res	visit(RegExp.EmptyStr<A> re) Subclasses should override this method to define special processing for an EmptyStr regular expression.
Res	visit(RegExp.None<A> re) Subclasses should override this method to define special processing for a None regular expression.
Res	visit(RegExp.Star<A> re) Subclasses should override this method to define special processing for a Star regular expression.
Res	visit(RegExp.Union<A> re) Subclasses should override this method to define special processing for a Union regular expression.
Res	visit(RegExp<A> re) Default code to execute for a regular expression.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RegExp.Visitor

public RegExp.Visitor()

Method Detail

visit

public Res visit(RegExp.None<A> re)

Subclasses should override this method to define special processing for a None regular expression.

visit

public Res visit(RegExp.Atomic<A> re)

Subclasses should override this method to define special processing for an Atomic regular expression.

visit

public Res visit(RegExp.EmptyStr<A> re)

Subclasses should override this method to define special processing for an EmptyStr regular expression.

visit

public Res visit(RegExp.Union<A> re)

Subclasses should override this method to define special processing for a Union regular expression.

visit

public Res visit(RegExp.Concat<A> re)

Subclasses should override this method to define special processing for a Concat regular expression.

visit

public Res visit(RegExp.Star<A> re)

Subclasses should override this method to define special processing for a Star regular expression.

visit

public Res visit(RegExp<A> re)

Default code to execute for a regular expression. If a subclass does not override the processing for a certain RegExp subclass, this code will be executed instead.