/*
 * Copyright (c) 2002-2004 Widespace, OU 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:
 *     Igor Malinin - initial contribution
 *
 * $Id: TagDoubleClickStrategy.java,v 1.2 2005-05-06 00:55:41 stefanbjarni Exp $
 */

package net.sourceforge.phpeclipse.xml.ui.internal.text;

import net.sourceforge.phpeclipse.ui.text.TextDoubleClickStrategy;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.ITypedRegion;


/**
 * 
 * 
 * @author Igor Malinin
 */
public class TagDoubleClickStrategy extends TextDoubleClickStrategy {
	/*
	 * @see org.eclipse.jface.text.ITextDoubleClickStrategy#doubleClicked(ITextViewer)
	 */
	public void doubleClicked( ITextViewer viewer ) {
		int offset = viewer.getSelectedRange().x;
		if ( offset < 0 ) {
			return;
		}

		try {
			IDocument document = viewer.getDocument();

			ITypedRegion region = document.getPartition( offset );

			int start = region.getOffset();

			if ( offset == start && document.getChar(offset) == '<' ) {
				region = document.getPartition( offset );
				offset = region.getOffset() + region.getLength();

				if ( document.getChar(offset - 1) != '>' ) {
					while ( true ) {
						if ( offset >= document.getLength() ) {
							break;
						}

						region = document.getPartition( offset );
						offset = region.getOffset() + region.getLength();

						if ( XMLPartitionScanner.XML_ATTRIBUTE
								.equals(region.getType()) ) {
							continue;
						}

						if ( XMLPartitionScanner.XML_TAG
								.equals(region.getType()) ) {
							if ( document.getChar(region.getOffset()) == '<' ) {
								break;
							}

							if ( document.getChar(offset - 1) == '>' ) {
								break;
							}

							continue;
						}

						offset = region.getOffset();
						break;
					}
				}

				viewer.setSelectedRange( start, offset - start );
				return;
			}

			int end = start + region.getLength();

			if ( offset == end - 1 && document.getChar(offset) == '>' ) {
				region = document.getPartition( offset );
				offset = region.getOffset();

				if ( document.getChar(offset) != '<' ) {
					while ( true ) {
						if ( offset <= 0 ) {
							break;
						}

						region = document.getPartition( offset - 1 );
						offset = region.getOffset();

						if ( XMLPartitionScanner.XML_ATTRIBUTE
								.equals(region.getType()) ) {
							continue;
						}

						if ( XMLPartitionScanner.XML_TAG
								.equals(region.getType()) ) {
							if ( document.getChar(offset) == '<' ) {
								break;
							}

							continue;
						}

						offset += region.getLength();
						break;
					}
				}

				viewer.setSelectedRange( offset, end - offset );
				return;
			}

			super.doubleClicked( viewer );
		} catch ( BadLocationException e ) {}
	}
}