// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

package com.symbian.smt.gui.editors.xmleditor;

import org.eclipse.jface.text.BadLocationException;

import org.eclipse.jface.text.IDocument;

import org.eclipse.jface.text.ITextDoubleClickStrategy;

import org.eclipse.jface.text.ITextViewer;

/**

 * @author barbararosi-schwartz

 * 

 */

public class XMLDoubleClickStrategy implements ITextDoubleClickStrategy {

	protected ITextViewer fText;

	public void doubleClicked(ITextViewer part) {

		int pos = part.getSelectedRange().x;

		if (pos < 0)

			return;

		fText = part;

		if (!selectComment(pos)) {

			selectWord(pos);

		}

	}

	protected boolean selectComment(int caretPos) {

		IDocument doc = fText.getDocument();

		int startPos, endPos;

		try {

			int pos = caretPos;

			char c = ' ';

			while (pos >= 0) {

				c = doc.getChar(pos);

				if (c == '\\') {

					pos -= 2;

					continue;

				}

				if (c == Character.LINE_SEPARATOR || c == '\"')

					break;

				--pos;

			}

			if (c != '\"')

				return false;

			startPos = pos;

			pos = caretPos;

			int length = doc.getLength();

			c = ' ';

			while (pos < length) {

				c = doc.getChar(pos);

				if (c == Character.LINE_SEPARATOR || c == '\"')

					break;

				++pos;

			}

			if (c != '\"')

				return false;

			endPos = pos;

			int offset = startPos + 1;

			int len = endPos - offset;

			fText.setSelectedRange(offset, len);

			return true;

		} catch (BadLocationException x) {

		}

		return false;

	}

	private void selectRange(int startPos, int stopPos) {

		int offset = startPos + 1;

		int length = stopPos - offset;

		fText.setSelectedRange(offset, length);

	}

	protected boolean selectWord(int caretPos) {

		IDocument doc = fText.getDocument();

		int startPos, endPos;

		try {

			int pos = caretPos;

			char c;

			while (pos >= 0) {

				c = doc.getChar(pos);

				if (!Character.isJavaIdentifierPart(c))

					break;

				--pos;

			}

			startPos = pos;

			pos = caretPos;

			int length = doc.getLength();

			while (pos < length) {

				c = doc.getChar(pos);

				if (!Character.isJavaIdentifierPart(c))

					break;

				++pos;

			}

			endPos = pos;

			selectRange(startPos, endPos);

			return true;

		} catch (BadLocationException x) {

		}

		return false;

	}

}