/*

* 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 System.Collections;

using SymBuildParsingLib.Tree;

using SymBuildParsingLib.Token;

using SymBuildParsingLib.Parser.Framework;

using SymBuildParsingLib.Parser.Framework.Workers;

using SymBuildParsingLib.Parser.Framework.Nodes;

using SymBuildParsingLib.Parser.PreProcessor.Parser;

namespace SymBuildParsingLib.Parser.PreProcessor.Workers

{

	public class SymPreProcessorWorker : SymParserWorker

	{

		#region Constructors & destructor

		public SymPreProcessorWorker( SymParserWorkerContext aContext )

			: base( aContext, 1000 )

		{

		}

		#endregion

		#region From SymParserWorker

		public override SymParserWorker.TTokenConsumptionType OfferToken( SymToken aToken )

		{

			TTokenConsumptionType ret = TTokenConsumptionType.ETokenNotConsumed;

			#region Identify preprocessor tokens

			if ( aToken.Class == SymToken.TClass.EClassPreProcessor ) 

			{

				if	( ChildCount == 0 )

				{

					if	( aToken.Value == "#" )

					{

						// Always consume initial preprocessor tokens...

						ret = TTokenConsumptionType.ETokenConsumed;

					}

					else

					{

						// Try to find a new child worker to handle this kind

						// of data.

						SymParserWorker worker = CreateWorkerByTokenType( aToken );

						//

						if	( worker != null )

						{

							System.Diagnostics.Debug.WriteLine( "SymPreProcessorWorker.OfferToken() - FOUND HANDLER FOR: " + aToken.Value );

							AddChild( worker );

							ret = TTokenConsumptionType.ETokenConsumed;

						}

					}

				}

			}

			#endregion

			// Give it to the children

			if	( ret == TTokenConsumptionType.ETokenNotConsumed )

			{

				// Check whether we're inside a conditional expression skip state.

				bool allowedToOffer = Parser.ConditionalExpressionValue;

				if	( allowedToOffer )

				{

					ret = base.OfferToken( aToken );

				}

			}

			//

			return ret;

		}

		#endregion

		#region Internal methods

		private SymParserWorker CreateWorkerByTokenType( SymToken aToken )

		{

			// Find a worker to handle the token type

			SymParserWorker worker = null;

			SymParserWorkerContext context = new SymParserWorkerContext( WorkerContext, this, aToken );

			//

			switch( aToken.Value )

			{

				// Simple preprocessor operations

				case "define":

					worker = new SymPreProcessorWorkerDefine( context );

					break;

				case "undef":

					break;

				case "include":

					worker = new SymPreProcessorWorkerInclude( context );

					break;

				// Conditionality

				case "if":

					worker = new SymPreProcessorWorkerIf( context );

					break;

				case "ifdef":

					worker = new SymPreProcessorWorkerIfdef( context );

					break;

				case "ifndef":

					worker = new SymPreProcessorWorkerIfndef( context );

					break;

				case "else":

					worker = new SymPreProcessorWorkerElse( context );

					break;

				case "elif":

					worker = new SymPreProcessorWorkerElseIf( context );

					break;

				case "endif":

					worker = new SymPreProcessorWorkerEndif( context );

					break;

				// Skip unhandled preprocessor directives

				default:

					worker = new SymParserWorkerConsumer( context, SymToken.TClass.EClassNewLine );

					break;

			}

			//

			return worker;

		}

		#endregion

		#region Internal properties

		private SymPreProcessorParser Parser

		{

			get

			{

				return (SymPreProcessorParser) WorkerContext.Parser;

			}

		}

		#endregion

		#region Data members

		#endregion

	}

}