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 SymBuildParsingLib.Tree;

    20 using SymBuildParsingLib.Parser.Framework;

    21 using SymBuildParsingLib.Parser.Framework.Nodes;

    22 using SymBuildParsingLib.Parser.Framework.Workers;

    23 using SymBuildParsingLib.Parser.PreProcessor.Parser;

    24 

    25 namespace SymBuildParsingLib.Parser.PreProcessor.Workers

    26 {

    27 	public class SymPreProcessorWorkerEndif : SymParserWorker

    28 	{

    29 		#region Constructors & destructor

    30 		public SymPreProcessorWorkerEndif( SymParserWorkerContext aContext )

    31 			: base( aContext )

    32 		{

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

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

    35 			// node.

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

    37 			if	( condExpNode == null )

    38 			{

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

    40 			}

    41 

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

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

    44 			{

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

    46 			}

    47 

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

    49 			// Any new tokens will appear as siblings

    50 			aContext.Document.CurrentNode = condExpNode.Parent;

    51 

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

    53 			SymPreProcessorParser parser = (SymPreProcessorParser) aContext.Parser;

    54 			SymNodeConditionalExpression poppedExpression = parser.ConditionalExpressionPop();

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

    56 

    57 			// Job done - dequeue

    58 			RemoveSelf();

    59 		}

    60 		#endregion

    61 	}

    62 }