/*

* 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 SymBuildParsingLib.Tree;

using SymBuildParsingLib.Parser.Framework;

using SymBuildParsingLib.Parser.Framework.Nodes;

using SymBuildParsingLib.Parser.Framework.Workers;

using SymBuildParsingLib.Parser.PreProcessor.Parser;

namespace SymBuildParsingLib.Parser.PreProcessor.Workers

{

	public class SymPreProcessorWorkerEndif : SymParserWorker

	{

		#region Constructors & destructor

		public SymPreProcessorWorkerEndif( SymParserWorkerContext aContext )

			: base( aContext )

		{

			// When the endif token is reached, we must work back up the tree

			// looking for the previous (i.e. most recent) conditional expression

			// node.

			SymNodeConditionalExpression condExpNode = SymParserWorkerConditionalExpression.FindMostRecentConditionalExpression( aContext.Document.CurrentNode );

			if	( condExpNode == null )

			{

				throw new Exception( "Unable to locate most recent condition expression during ENDIF handling" );

			}

			// There must always be a positive condition node and some kind of condition

			if	( condExpNode.ChildTypeExists( typeof(SymNodeCondition) ) == false )

			{

				throw new Exception( "No child condition node found during ENDIF handling" );

			}

			// We change the current node to be the parent of the conditional expression. 

			// Any new tokens will appear as siblings

			aContext.Document.CurrentNode = condExpNode.Parent;

			// Make sure we tell the parser that it can pop off this conditional expression node.

			SymPreProcessorParser parser = (SymPreProcessorParser) aContext.Parser;

			SymNodeConditionalExpression poppedExpression = parser.ConditionalExpressionPop();

			System.Diagnostics.Debug.Assert( poppedExpression == condExpNode );

			// Job done - dequeue

			RemoveSelf();

		}

		#endregion

	}

}