UnifiedBracketMatcher.java

/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.editors.unified;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.source.ICharacterPairMatcher;

/**
 * @author Paul Colton
 */
public class UnifiedBracketMatcher implements ICharacterPairMatcher
{
	int anchor = 0;
	IUnifiedBracketMatcherListener listener;

	/**
	 * UnifiedBracketMatcher
	 */
	public UnifiedBracketMatcher()
	{
	}

	/**
	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#dispose()
	 */
	public void dispose()
	{
		listener = null;
	}

	/**
	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#clear()
	 */
	public void clear()
	{
	}

	/**
	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#match(org.eclipse.jface.text.IDocument, int)
	 */
	public IRegion match(IDocument iDocument, int offset)
	{
		if (listener == null)
		{
			return null;
		}

		IRegion result = listener.onBracketMatch(offset);

		if (result != null)
		{
			anchor = offset >= result.getOffset() ? 1 : 0;
		}

		return result;
	}

	/**
	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#getAnchor()
	 */
	public int getAnchor()
	{
		return anchor;
	}

	/**
	 * addBracketMatchListener
	 * 
	 * @param obj
	 */
	public void addBracketMatchListener(IUnifiedBracketMatcherListener obj)
	{
		listener = obj;
	}

	/**
	 * removeBracketMatchListener
	 * 
	 * @param obj
	 */
	public void removeBracketMatchListener(IUnifiedBracketMatcherListener obj)
	{
		listener = null;
	}
}