diff -r 000000000000 -r 818e61de6cd1 crashanalysercmd/PerfToolsSharedLibraries/Engine/SymBuildParsingLib/Parser/Framework/Document/SymParserDocument.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymBuildParsingLib/Parser/Framework/Document/SymParserDocument.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,78 @@
+/*
+* 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 SymbianTree;
+
+namespace SymBuildParsingLib.Parser.Framework.Document
+{
+	public abstract class SymParserDocument : SymDocument
+	{
+		#region Constructors & destructor
+		public SymParserDocument( SymParserDocumentContext aContext )
+		{
+			aContext.Document = this;
+			iContextStack.Push( aContext );
+		}
+		#endregion
+
+		#region API
+		public void PushContext( SymParserDocumentContext aContext )
+		{
+			iContextStack.Push( aContext );
+		}
+
+		public SymParserDocumentContext PopContext()
+		{
+			SymParserDocumentContext top = (SymParserDocumentContext) iContextStack.Peek();
+			return PopContext( top );
+		}
+
+		public SymParserDocumentContext PopContext( SymParserDocumentContext aExpected )
+		{
+			// Can't pop off the last context
+			System.Diagnostics.Debug.Assert( iContextStack.Count > 1 );
+			SymParserDocumentContext top = (SymParserDocumentContext) iContextStack.Peek();
+			//
+			if	( aExpected.Equals( aExpected ) == false )
+			{
+				throw new ArgumentException( "Cannot pop context - expectations not met during pop operation" );
+			}
+			//
+			iContextStack.Pop();
+			return top;
+		}
+		#endregion
+
+		#region Properties
+		public SymParserDocumentContext Context
+		{
+			get
+			{
+				System.Diagnostics.Debug.Assert( iContextStack.Count > 0 );
+				SymParserDocumentContext ret = (SymParserDocumentContext) iContextStack.Peek();
+				return ret;
+			}
+		}
+		#endregion
+
+		#region Data members
+		private Stack iContextStack = new Stack();
+		#endregion
+	}
+}