--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymBuildParsingLib/Parser/Framework/Workers/SymParserWorkerCondition.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,124 @@
+/*
+* 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.Token;
+using SymBuildParsingLib.Parser.Framework.Nodes;
+using SymBuildParsingLib.Utils;
+using SymbianTree;
+
+namespace SymBuildParsingLib.Parser.Framework.Workers
+{
+	public class SymParserWorkerCondition : SymParserWorkerConsumer
+	{
+		#region Constructors & destructor
+		public SymParserWorkerCondition( SymParserWorkerContext aContext )
+			: this( aContext, new SymNodeCondition( aContext.CurrentToken.Value ) )
+		{
+		}
+
+		public SymParserWorkerCondition( SymParserWorkerContext aContext, SymNodeCondition aNodeCondition )
+			: base( aContext, SymToken.TClass.EClassNewLine )
+		{
+			System.Diagnostics.Debug.Assert( aContext.Document.CurrentNode is SymNodeConditionalExpression );
+
+			// Make a new child node for the conditions. 
+			iConditionNode = aNodeCondition;
+			aContext.Document.CurrentNode.Add( iConditionNode );
+			aContext.Document.CurrentNode = iConditionNode;
+
+			// Set up the token balancer event handler
+			iTokenBalancer.EventLevelFinished += new SymBuildParsingLib.Token.SymTokenBalancer.LevelChangeEventHandler( TokenBalancer_EventLevelFinished );
+			iTokenBalancer.EventLevelsImbalanced += new SymBuildParsingLib.Token.SymTokenBalancer.LevelsImbalancedEventHandler( TokenBalancer_EventLevelsImbalanced );
+
+			// If we're handling an ifdef or ifndef expression, we can tell
+			// the token balancer to discard all brackets, irrespective of their level.
+			// For normal if statements, we want the brackets.
+			bool emitLevelZeroBrackets = !( iConditionNode.Type == SymNodeCondition.TType.ETypeIfdef || iConditionNode.Type == SymNodeCondition.TType.ETypeIfndef );
+			iTokenBalancer.RegisterBalancerTokens( emitLevelZeroBrackets );
+		}
+		#endregion
+
+		#region From SymParserWorker
+		public override SymParserWorker.TTokenConsumptionType OfferToken( SymToken aToken )
+		{
+			System.Diagnostics.Debug.Assert( WorkerContext.Document.CurrentNode is SymNodeCondition );
+			//
+			TTokenConsumptionType ret = TTokenConsumptionType.ETokenNotConsumed;
+			if	( aToken.Class != SymToken.TClass.EClassNewLine )
+			{
+				if	( iTokenBalancer.OfferToken( aToken ) )
+				{
+					ret = TTokenConsumptionType.ETokenConsumed;
+				}
+			}
+
+			// Try offering to base class....
+			// Base class will dequeue us once we reach the new line
+			if	( ret != TTokenConsumptionType.ETokenConsumed )
+			{
+				ret = base.OfferToken( aToken );
+			}
+
+			return ret;
+		}
+		#endregion
+
+		#region From SymParserWorkerConsumer
+		protected override void HandleTerminatingConditionMatch( SymToken aToken )
+		{
+			// Give the condition node ownership of the raw parsed tokens
+			iConditionNode.AssignArgumentTokens( iTokenBalancer.DocumentTree );
+
+			// We only need to evaluate the conditional arguments if we have not yet
+			// found a positive branch.
+			SymNodeConditionalExpression condExpNode = (SymNodeConditionalExpression) iConditionNode.Parent;
+			if	( condExpNode.HasPositiveBranch == false )
+			{
+				iConditionNode.Evaluate( WorkerContext );
+			}
+
+			// We remain as the current node, even after we die. This allows
+			// the body of the condition to be added as our child.
+		}
+		#endregion
+
+		#region Properties
+		public SymNodeCondition ConditionNode
+		{
+			get { return iConditionNode; }
+		}
+		#endregion
+
+		#region Token balancer event handlers
+		private void TokenBalancer_EventLevelFinished( int aLevelCount, SymNode aOldLevel, SymNode aNewLevel )
+		{
+		}
+
+		private void TokenBalancer_EventLevelsImbalanced()
+		{
+			throw new Exception( "Levels not balanced during condition parsing" );
+		}
+		#endregion
+
+		#region Data members
+		private SymTokenBalancer iTokenBalancer = new SymTokenBalancer();
+		private readonly SymNodeCondition iConditionNode;
+		#endregion
+	}
+}