/**
 * Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Eclipse Public License (EPL).
 * Please see the license.txt included with this distribution for details.
 * Any modifications to this file must keep this entire header intact.
 */
package com.python.pydev.refactoring.hyperlink;

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

/**
 * Just see if we can find a word at a given position in the document (same as JavaWordFinder)
 *
 * @author Fabio
 */
public class PythonWordFinder {

    public static IRegion findWord(IDocument document, int offset) {

        int start = -2;
        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;
    }

}