/*******************************************************************************
 * Copyright (c) 2005, 2007 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Bjorn Freeman-Benson - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.examples.ui.pda.editor;

 
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;

/**
 * Looks for an identifier in a source file
 */
public class WordFinder {
	
    /**
     * Returns the region in the given document that contains an identifier, or
     * <code>null</code> if none.
     * 
     * @param document document to search
     * @param offset offset at which to look for an identifier
     * @return region containing an identifier, or <code>null</code>
     */
	public static IRegion findWord(IDocument document, int offset) {
		
		int start= -1;
		int end= -1;
		
		
		try {
			
			int pos= offset;
			char c;
			
			while (pos >= 0) {
				c= document.getChar(pos);
				if (!Character.isJavaIdentifierPart(c))
					break;
				--pos;
			}
			
			start= pos;
			
			pos= offset;
			int length= document.getLength();
			
			while (pos < length) {
				c= document.getChar(pos);
				if (!Character.isJavaIdentifierPart(c))
					break;
				++pos;
			}
			
			end= pos;
			
		} catch (BadLocationException x) {
		}
		
		if (start > -1 && end > -1) {
			if (start == offset && end == offset)
				return new Region(offset, 0);
			else if (start == offset)
				return new Region(start, end - start);
			else
				return new Region(start + 1, end - start - 1);
		}
		
		return null;
	}
}