/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.internal.ui.text;

import net.sourceforge.phpdt.internal.compiler.parser.Scanner;

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

public class JavaWordFinder {

	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 (c == '$') {
					--pos;
					break;
				}
				if (!Scanner.isPHPIdentifierPart(c))
					break;

				--pos;
			}

			start = pos;

			pos = offset;
			int length = document.getLength();

			while (pos < length) {
				c = document.getChar(pos);
				if (!Scanner.isPHPIdentifierPart(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;
	}
}