/*******************************************************************************
* 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.precede;
import org.rascalmpl.parser.gtd.location.PositionStore;
import org.rascalmpl.parser.gtd.stack.filter.IEnterFilter;
/**
* A filter that requires the indicated substring to start at a certain column.
*/
public class AtColumnRequirement implements IEnterFilter{
private final int column;
public AtColumnRequirement(int column){
super();
this.column = column;
}
public boolean isFiltered(int[] input, int start, PositionStore positionStore){
return positionStore.isAtColumn(start, column);
}
public boolean isEqual(IEnterFilter otherEnterFilter){
if(!(otherEnterFilter instanceof AtColumnRequirement)) return false;
AtColumnRequirement otherAtColumnFilter = (AtColumnRequirement) otherEnterFilter;
return column != otherAtColumnFilter.column;
}
}