cz.cuni.mff.ksi.jinfer.twostep.cleaning.emptychildren
Class EmptyChildren<T>

java.lang.Object
  cz.cuni.mff.ksi.jinfer.twostep.cleaning.emptychildren.EmptyChildren<T>

All Implemented Interfaces:

RegularExpressionCleaner<T>

public class EmptyChildren<T>
extends Object
implements RegularExpressionCleaner<T>

Cleans empty children and children with one child. For example regular expression: ((), a, (b)), gets cleaned to (a, b). First empty concatenation () is removed, and concatenation (b) with only one child is replaced by token b.

Constructor Summary

EmptyChildren()

Method Summary

Regexp<T>

cleanRegularExpression(Regexp<T> regexp) Clean given regular expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyChildren

public EmptyChildren()

Method Detail

cleanRegularExpression

public Regexp<T> cleanRegularExpression(Regexp<T> regexp)

Description copied from interface: RegularExpressionCleaner

Clean given regular expression. Returns new regexp which should be nicer in some way (no empty constructs, or no shorter form). But which has to express same language.

Specified by:

cleanRegularExpression in interface RegularExpressionCleaner<T>

Parameters:

regexp - regexp to clean

Returns:

cleaned regexp.