/*

* Copyright (c) 2004-2008 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: 

*

*/

using System;

using Microsoft.JScript;

using Microsoft.JScript.Vsa;

using Microsoft.Vsa;

namespace SymBuildParsingLib.Utils

{

	public class SymExpressionEvaluator

	{

		#region API

		public static object Evaluate( string aExpression )

		{

			object ret = null;

			//

			try

			{

				ret = Microsoft.JScript.Eval.JScriptEvaluate( aExpression, iScriptEngine );

			}

			catch (Exception)

			{

				ret = false;

			}

			//

			return ret;

		}

		public static bool EvaluateAsBoolean( string aExpression )

		{

			bool ret = false;

			//

			object result = Evaluate( aExpression );

			//

			if	( result != null )

			{

				if	( result is bool )

				{

					ret = (bool) result;

				}

				else

				{

					// Anything non-NULL that is not a bool will be treated

					// as 'true'

					ret = true;

				}

			}

			else

			{

				// Null evaluation so we'll treat that as 'false'

				ret = false;

			}

			//

			return ret;

		}

		#endregion

		#region Data members

		private static VsaEngine iScriptEngine = VsaEngine.CreateEngine();

		#endregion

	}

}