/*******************************************************************************
* Copyright (c) 2009-2013 CWI
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* * Arnold Lankamp - Arnold.Lankamp@cwi.nl
*******************************************************************************/
package org.rascalmpl.parser.gtd.stack.filter.follow;
import org.rascalmpl.parser.gtd.location.PositionStore;
import org.rascalmpl.parser.gtd.stack.filter.ICompletionFilter;
/**
* A filter that restricts the indicated substring from being followed by the
* string associated with this filter.
*/
public class StringFollowRestriction implements ICompletionFilter{
private final int[] string;
public StringFollowRestriction(int[] string){
super();
this.string = string;
}
public boolean isFiltered(int[] input, int start, int end, PositionStore positionStore){
if((end + string.length - 1) >= input.length) return false;
for(int i = string.length - 1; i >= 0; --i){
if(input[end + i] != string[i]) return false;
}
return true;
}
public boolean isEqual(ICompletionFilter otherCompletionFilter){
if(!(otherCompletionFilter instanceof StringFollowRestriction)) return false;
StringFollowRestriction otherStringFollowFilter = (StringFollowRestriction) otherCompletionFilter;
int[] otherString = otherStringFollowFilter.string;
if(string.length != otherString.length) return false;
for(int i = string.length - 1; i >= 0; --i){
if(string[i] != otherString[i]) return false;
}
return true;
}
}