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1 /* |
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2 * Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 using System; |
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19 using SymBuildParsingLib.Tree; |
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20 using SymBuildParsingLib.Token; |
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21 using SymbianTree; |
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22 |
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23 namespace SymBuildParsingLib.Parser.Framework.Workers |
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24 { |
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25 public class SymParserWorkerConsumer : SymParserWorker |
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26 { |
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27 #region Enumerations |
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28 public enum TDyingAction |
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29 { |
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30 EWhenDyingTakeNoAction = 0, |
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31 EWhenDyingMakeRelativeParentNodeCurrent, |
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32 EWhenDyingMakeAbsoluteParentNodeCurrent |
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33 } |
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34 #endregion |
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35 |
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36 #region Constructors & destructor |
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37 public SymParserWorkerConsumer( SymParserWorkerContext aContext, SymToken.TClass aTerminatingClassType ) |
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38 : this( aContext, aTerminatingClassType, TDyingAction.EWhenDyingTakeNoAction ) |
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39 { |
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40 } |
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41 |
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42 public SymParserWorkerConsumer( SymParserWorkerContext aContext, SymToken.TClass aTerminatingClassType, TDyingAction aDyingAction ) |
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43 : base( aContext ) |
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44 { |
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45 iTerminatingClassType = aTerminatingClassType; |
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46 iDyingAction = aDyingAction; |
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47 } |
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48 #endregion |
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49 |
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50 #region Properties |
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51 public SymTokenContainer ConsumedTokens |
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52 { |
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53 get { return iConsumedTokens; } |
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54 } |
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55 #endregion |
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56 |
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57 #region Abstract API |
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58 protected virtual void HandleTerminatingConditionMatch( SymToken aToken ) |
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59 { |
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60 } |
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61 #endregion |
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62 |
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63 #region From SymParserWorker |
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64 public override SymParserWorker.TTokenConsumptionType OfferToken( SymToken aToken ) |
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65 { |
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66 iConsumedTokens.Append( aToken ); |
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67 |
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68 if ( aToken.Class == iTerminatingClassType ) |
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69 { |
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70 // Work out which node will become the parent (if we are configured in that way) |
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71 SymNode newParent = CalculateNewParentNode(); |
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72 |
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73 // Call back to parent class |
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74 HandleTerminatingConditionMatch( aToken ); |
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75 |
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76 // Reached the new line token. Stop receiving the tokens. We're done. |
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77 WorkerContext.Parent.RemoveChild( this ); |
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78 |
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79 // If the dying action was to make the relative parent node |
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80 // the current one, then we must call CalculateNewParentNode again |
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81 // after the HandleTerminatingConditionMatch callback - since |
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82 // it may have changed the tree. |
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83 if ( iDyingAction == TDyingAction.EWhenDyingMakeRelativeParentNodeCurrent ) |
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84 { |
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85 newParent = CalculateNewParentNode(); |
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86 } |
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87 |
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88 // Update the document with the new parent node |
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89 WorkerContext.Document.CurrentNode = newParent; |
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90 } |
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91 // |
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92 return TTokenConsumptionType.ETokenConsumed; |
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93 } |
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94 #endregion |
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95 |
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96 #region Internal methods |
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97 private SymNode CalculateNewParentNode() |
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98 { |
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99 SymNode ret = WorkerContext.Document.CurrentNode; |
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100 // |
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101 if ( iDyingAction != TDyingAction.EWhenDyingTakeNoAction && WorkerContext.Document.CurrentNode.HasParent ) |
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102 { |
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103 ret = WorkerContext.Document.CurrentNode.Parent; |
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104 } |
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105 // |
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106 return ret; |
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107 } |
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108 #endregion |
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109 |
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110 #region Data members |
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111 private readonly SymToken.TClass iTerminatingClassType; |
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112 private readonly TDyingAction iDyingAction = TDyingAction.EWhenDyingTakeNoAction; |
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113 private SymTokenContainer iConsumedTokens = new SymTokenContainer(); |
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114 #endregion |
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115 } |
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116 } |