/*

* 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.Nodes;

namespace SymBuildParsingLib.Parser.PreProcessor.Workers

{

	public class SymPreProcessorWorkerElse : SymParserWorker

	{

		#region Constructors & destructor

		public SymPreProcessorWorkerElse( SymParserWorkerContext aContext )

			: base( aContext )

		{

			// When the else 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 ELSE 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 ELSE handling" );

			}

			// Make the conditional expression the current node

			aContext.Document.CurrentNode = condExpNode;

			// Make a new condition worker. The condition worker creates a new condition node

			// which becomes the new current node.

			SymParserWorkerContext context = new SymParserWorkerContext( aContext.Document.Context, this );

			SymParserWorkerCondition conditionWorker = new SymParserWorkerCondition( context, new SymNodePreProcessorCondition( aContext.CurrentToken.Value ) );

			AddChild( conditionWorker );

			// If we didn't find any appropriately handled condition object, then

			// we make this the catch-all condition (with no expression to evaluate)

			if	( condExpNode.HasPositiveBranch == false )

			{

			}

		}

		#endregion

		#region From SymParserWorker

		public override void RemoveChild( SymParserWorker aWorker )

		{

			base.RemoveChild( aWorker );

			RemoveSelf();

		}

		#endregion

	}

	public class SymPreProcessorWorkerElseIf : SymParserWorker

	{

		#region Constructors & destructor

		public SymPreProcessorWorkerElseIf( SymParserWorkerContext aContext )

			: base( aContext )

		{

			// When the else 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 ELSE IF 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 ELSE IF handling" );

			}

			// Make the conditional expression the current node

			aContext.Document.CurrentNode = condExpNode;

			// Make a new condition worker. The condition worker creates a new condition node

			// which becomes the new current node.

			SymParserWorkerContext context = new SymParserWorkerContext( aContext.Document.Context, this );

			SymParserWorkerCondition conditionWorker = new SymParserWorkerCondition( context, new SymNodePreProcessorCondition( aContext.CurrentToken.Value ) );

			AddChild( conditionWorker );

		}

		#endregion

		#region From SymParserWorker

		public override void RemoveChild( SymParserWorker aWorker )

		{

			base.RemoveChild( aWorker );

			RemoveSelf();

		}

		#endregion

	}

}