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.Nodes;

    24 

    25 namespace SymBuildParsingLib.Parser.PreProcessor.Workers

    26 {

    27 	public class SymPreProcessorWorkerElse : SymParserWorker

    28 	{

    29 		#region Constructors & destructor

    30 		public SymPreProcessorWorkerElse( SymParserWorkerContext aContext )

    31 			: base( aContext )

    32 		{

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

    46 			}

    47 

    48 			// Make the conditional expression the current node

    49 			aContext.Document.CurrentNode = condExpNode;

    50 

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

    52 			// which becomes the new current node.

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

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

    55 			AddChild( conditionWorker );

    56 

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

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

    59 			if	( condExpNode.HasPositiveBranch == false )

    60 			{

    61 			}

    62 		}

    63 		#endregion

    64 

    65 		#region From SymParserWorker

    66 		public override void RemoveChild( SymParserWorker aWorker )

    67 		{

    68 			base.RemoveChild( aWorker );

    69 			RemoveSelf();

    70 		}

    71 		#endregion

    72 	}

    73 

    74 	public class SymPreProcessorWorkerElseIf : SymParserWorker

    75 	{

    76 		#region Constructors & destructor

    77 		public SymPreProcessorWorkerElseIf( SymParserWorkerContext aContext )

    78 			: base( aContext )

    79 		{

    80 			// When the else token is reached, we must work back up the tree

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

    82 			// node.

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

    84 			if	( condExpNode == null )

    85 			{

    86 				throw new Exception( "Unable to locate most recent condition expression during ELSE IF handling" );

    87 			}

    88 

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

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

    91 			{

    92 				throw new Exception( "No child condition node found during ELSE IF handling" );

    93 			}

    94 

    95 			// Make the conditional expression the current node

    96 			aContext.Document.CurrentNode = condExpNode;

    97 

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

    99 			// which becomes the new current node.

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

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

   102 			AddChild( conditionWorker );

   103 		}

   104 		#endregion

   105 

   106 		#region From SymParserWorker

   107 		public override void RemoveChild( SymParserWorker aWorker )

   108 		{

   109 			base.RemoveChild( aWorker );

   110 			RemoveSelf();

   111 		}

   112 		#endregion

   113 	}

   114 }