1 /*

     2 * Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 using System;

    19 using Microsoft.JScript;

    20 using Microsoft.JScript.Vsa;

    21 using Microsoft.Vsa;

    22 

    23 

    24 namespace SymBuildParsingLib.Utils

    25 {

    26 	public class SymExpressionEvaluator

    27 	{

    28 		#region API

    29 		public static object Evaluate( string aExpression )

    30 		{

    31 			object ret = null;

    32 			//

    33 			try

    34 			{

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

    36 			}

    37 			catch (Exception)

    38 			{

    39 				ret = false;

    40 			}

    41 			//

    42 			return ret;

    43 		}

    44 

    45 		public static bool EvaluateAsBoolean( string aExpression )

    46 		{

    47 			bool ret = false;

    48 			//

    49 			object result = Evaluate( aExpression );

    50 			//

    51 			if	( result != null )

    52 			{

    53 				if	( result is bool )

    54 				{

    55 					ret = (bool) result;

    56 				}

    57 				else

    58 				{

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

    60 					// as 'true'

    61 					ret = true;

    62 				}

    63 			}

    64 			else

    65 			{

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

    67 				ret = false;

    68 			}

    69 			//

    70 			return ret;

    71 		}

    72 		#endregion

    73 

    74 		#region Data members

    75 		private static VsaEngine iScriptEngine = VsaEngine.CreateEngine();

    76 		#endregion

    77 	}

    78 }