Mercurial > projects > dwt2
annotate org.eclipse.text/src/org/eclipse/jface/text/GapTextStore.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module org.eclipse.jface.text.GapTextStore; |
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14 |
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15 import org.eclipse.jface.text.IDocumentPartitioningListener; // packageimport |
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16 import org.eclipse.jface.text.DefaultTextHover; // packageimport |
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17 import org.eclipse.jface.text.AbstractInformationControl; // packageimport |
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18 import org.eclipse.jface.text.TextUtilities; // packageimport |
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19 import org.eclipse.jface.text.IInformationControlCreatorExtension; // packageimport |
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20 import org.eclipse.jface.text.AbstractInformationControlManager; // packageimport |
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21 import org.eclipse.jface.text.ITextViewerExtension2; // packageimport |
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22 import org.eclipse.jface.text.IDocumentPartitioner; // packageimport |
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23 import org.eclipse.jface.text.DefaultIndentLineAutoEditStrategy; // packageimport |
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24 import org.eclipse.jface.text.ITextSelection; // packageimport |
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25 import org.eclipse.jface.text.Document; // packageimport |
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26 import org.eclipse.jface.text.FindReplaceDocumentAdapterContentProposalProvider; // packageimport |
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27 import org.eclipse.jface.text.ITextListener; // packageimport |
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28 import org.eclipse.jface.text.BadPartitioningException; // packageimport |
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29 import org.eclipse.jface.text.ITextViewerExtension5; // packageimport |
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30 import org.eclipse.jface.text.IDocumentPartitionerExtension3; // packageimport |
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31 import org.eclipse.jface.text.IUndoManager; // packageimport |
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32 import org.eclipse.jface.text.ITextHoverExtension2; // packageimport |
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33 import org.eclipse.jface.text.IRepairableDocument; // packageimport |
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34 import org.eclipse.jface.text.IRewriteTarget; // packageimport |
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35 import org.eclipse.jface.text.DefaultPositionUpdater; // packageimport |
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36 import org.eclipse.jface.text.RewriteSessionEditProcessor; // packageimport |
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37 import org.eclipse.jface.text.TextViewerHoverManager; // packageimport |
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38 import org.eclipse.jface.text.DocumentRewriteSession; // packageimport |
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39 import org.eclipse.jface.text.TextViewer; // packageimport |
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40 import org.eclipse.jface.text.ITextViewerExtension8; // packageimport |
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41 import org.eclipse.jface.text.RegExMessages; // packageimport |
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42 import org.eclipse.jface.text.IDelayedInputChangeProvider; // packageimport |
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43 import org.eclipse.jface.text.ITextOperationTargetExtension; // packageimport |
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44 import org.eclipse.jface.text.IWidgetTokenOwner; // packageimport |
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45 import org.eclipse.jface.text.IViewportListener; // packageimport |
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46 import org.eclipse.jface.text.MarkSelection; // packageimport |
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47 import org.eclipse.jface.text.IDocumentPartitioningListenerExtension; // packageimport |
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48 import org.eclipse.jface.text.IDocumentAdapterExtension; // packageimport |
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49 import org.eclipse.jface.text.IInformationControlExtension; // packageimport |
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50 import org.eclipse.jface.text.IDocumentPartitioningListenerExtension2; // packageimport |
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51 import org.eclipse.jface.text.DefaultDocumentAdapter; // packageimport |
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52 import org.eclipse.jface.text.ITextViewerExtension3; // packageimport |
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53 import org.eclipse.jface.text.IInformationControlCreator; // packageimport |
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54 import org.eclipse.jface.text.TypedRegion; // packageimport |
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55 import org.eclipse.jface.text.ISynchronizable; // packageimport |
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56 import org.eclipse.jface.text.IMarkRegionTarget; // packageimport |
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57 import org.eclipse.jface.text.TextViewerUndoManager; // packageimport |
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58 import org.eclipse.jface.text.IRegion; // packageimport |
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59 import org.eclipse.jface.text.IInformationControlExtension2; // packageimport |
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60 import org.eclipse.jface.text.IDocumentExtension4; // packageimport |
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61 import org.eclipse.jface.text.IDocumentExtension2; // packageimport |
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62 import org.eclipse.jface.text.IDocumentPartitionerExtension2; // packageimport |
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63 import org.eclipse.jface.text.DefaultInformationControl; // packageimport |
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64 import org.eclipse.jface.text.IWidgetTokenOwnerExtension; // packageimport |
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65 import org.eclipse.jface.text.DocumentClone; // packageimport |
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66 import org.eclipse.jface.text.DefaultUndoManager; // packageimport |
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67 import org.eclipse.jface.text.IFindReplaceTarget; // packageimport |
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68 import org.eclipse.jface.text.IAutoEditStrategy; // packageimport |
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69 import org.eclipse.jface.text.ILineTrackerExtension; // packageimport |
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70 import org.eclipse.jface.text.IUndoManagerExtension; // packageimport |
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71 import org.eclipse.jface.text.TextSelection; // packageimport |
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72 import org.eclipse.jface.text.DefaultAutoIndentStrategy; // packageimport |
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73 import org.eclipse.jface.text.IAutoIndentStrategy; // packageimport |
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74 import org.eclipse.jface.text.IPainter; // packageimport |
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75 import org.eclipse.jface.text.IInformationControl; // packageimport |
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76 import org.eclipse.jface.text.IInformationControlExtension3; // packageimport |
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77 import org.eclipse.jface.text.ITextViewerExtension6; // packageimport |
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78 import org.eclipse.jface.text.IInformationControlExtension4; // packageimport |
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79 import org.eclipse.jface.text.DefaultLineTracker; // packageimport |
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80 import org.eclipse.jface.text.IDocumentInformationMappingExtension; // packageimport |
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81 import org.eclipse.jface.text.IRepairableDocumentExtension; // packageimport |
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82 import org.eclipse.jface.text.ITextHover; // packageimport |
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83 import org.eclipse.jface.text.FindReplaceDocumentAdapter; // packageimport |
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84 import org.eclipse.jface.text.ILineTracker; // packageimport |
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85 import org.eclipse.jface.text.Line; // packageimport |
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86 import org.eclipse.jface.text.ITextViewerExtension; // packageimport |
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87 import org.eclipse.jface.text.IDocumentAdapter; // packageimport |
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88 import org.eclipse.jface.text.TextEvent; // packageimport |
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89 import org.eclipse.jface.text.BadLocationException; // packageimport |
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90 import org.eclipse.jface.text.AbstractDocument; // packageimport |
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91 import org.eclipse.jface.text.AbstractLineTracker; // packageimport |
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92 import org.eclipse.jface.text.TreeLineTracker; // packageimport |
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93 import org.eclipse.jface.text.ITextPresentationListener; // packageimport |
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94 import org.eclipse.jface.text.Region; // packageimport |
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95 import org.eclipse.jface.text.ITextViewer; // packageimport |
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96 import org.eclipse.jface.text.IDocumentInformationMapping; // packageimport |
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97 import org.eclipse.jface.text.MarginPainter; // packageimport |
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98 import org.eclipse.jface.text.IPaintPositionManager; // packageimport |
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99 import org.eclipse.jface.text.TextPresentation; // packageimport |
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100 import org.eclipse.jface.text.IFindReplaceTargetExtension; // packageimport |
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101 import org.eclipse.jface.text.ISlaveDocumentManagerExtension; // packageimport |
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102 import org.eclipse.jface.text.ISelectionValidator; // packageimport |
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103 import org.eclipse.jface.text.IDocumentExtension; // packageimport |
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104 import org.eclipse.jface.text.PropagatingFontFieldEditor; // packageimport |
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105 import org.eclipse.jface.text.ConfigurableLineTracker; // packageimport |
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106 import org.eclipse.jface.text.SlaveDocumentEvent; // packageimport |
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107 import org.eclipse.jface.text.IDocumentListener; // packageimport |
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108 import org.eclipse.jface.text.PaintManager; // packageimport |
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109 import org.eclipse.jface.text.IFindReplaceTargetExtension3; // packageimport |
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110 import org.eclipse.jface.text.ITextDoubleClickStrategy; // packageimport |
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111 import org.eclipse.jface.text.IDocumentExtension3; // packageimport |
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112 import org.eclipse.jface.text.Position; // packageimport |
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113 import org.eclipse.jface.text.TextMessages; // packageimport |
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114 import org.eclipse.jface.text.CopyOnWriteTextStore; // packageimport |
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115 import org.eclipse.jface.text.WhitespaceCharacterPainter; // packageimport |
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116 import org.eclipse.jface.text.IPositionUpdater; // packageimport |
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117 import org.eclipse.jface.text.DefaultTextDoubleClickStrategy; // packageimport |
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118 import org.eclipse.jface.text.ListLineTracker; // packageimport |
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119 import org.eclipse.jface.text.ITextInputListener; // packageimport |
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120 import org.eclipse.jface.text.BadPositionCategoryException; // packageimport |
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121 import org.eclipse.jface.text.IWidgetTokenKeeperExtension; // packageimport |
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122 import org.eclipse.jface.text.IInputChangedListener; // packageimport |
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123 import org.eclipse.jface.text.ITextOperationTarget; // packageimport |
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124 import org.eclipse.jface.text.IDocumentInformationMappingExtension2; // packageimport |
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125 import org.eclipse.jface.text.ITextViewerExtension7; // packageimport |
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126 import org.eclipse.jface.text.IInformationControlExtension5; // packageimport |
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127 import org.eclipse.jface.text.IDocumentRewriteSessionListener; // packageimport |
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128 import org.eclipse.jface.text.JFaceTextUtil; // packageimport |
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129 import org.eclipse.jface.text.AbstractReusableInformationControlCreator; // packageimport |
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130 import org.eclipse.jface.text.TabsToSpacesConverter; // packageimport |
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131 import org.eclipse.jface.text.CursorLinePainter; // packageimport |
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132 import org.eclipse.jface.text.ITextHoverExtension; // packageimport |
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133 import org.eclipse.jface.text.IEventConsumer; // packageimport |
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134 import org.eclipse.jface.text.IDocument; // packageimport |
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135 import org.eclipse.jface.text.IWidgetTokenKeeper; // packageimport |
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136 import org.eclipse.jface.text.DocumentCommand; // packageimport |
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137 import org.eclipse.jface.text.TypedPosition; // packageimport |
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138 import org.eclipse.jface.text.IEditingSupportRegistry; // packageimport |
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139 import org.eclipse.jface.text.IDocumentPartitionerExtension; // packageimport |
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140 import org.eclipse.jface.text.AbstractHoverInformationControlManager; // packageimport |
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141 import org.eclipse.jface.text.IEditingSupport; // packageimport |
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142 import org.eclipse.jface.text.IMarkSelection; // packageimport |
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143 import org.eclipse.jface.text.ISlaveDocumentManager; // packageimport |
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144 import org.eclipse.jface.text.DocumentEvent; // packageimport |
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145 import org.eclipse.jface.text.DocumentPartitioningChangedEvent; // packageimport |
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146 import org.eclipse.jface.text.ITextStore; // packageimport |
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147 import org.eclipse.jface.text.JFaceTextMessages; // packageimport |
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148 import org.eclipse.jface.text.DocumentRewriteSessionEvent; // packageimport |
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149 import org.eclipse.jface.text.SequentialRewriteTextStore; // packageimport |
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150 import org.eclipse.jface.text.DocumentRewriteSessionType; // packageimport |
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151 import org.eclipse.jface.text.TextAttribute; // packageimport |
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152 import org.eclipse.jface.text.ITextViewerExtension4; // packageimport |
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153 import org.eclipse.jface.text.ITypedRegion; // packageimport |
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154 |
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155 |
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156 import java.lang.all; |
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157 import java.util.Set; |
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158 |
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159 import org.eclipse.core.runtime.Assert; |
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160 |
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161 |
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162 /** |
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163 * Implements a gap managing text store. The gap text store relies on the assumption that |
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164 * consecutive changes to a document are co-located. The start of the gap is always moved to the |
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165 * location of the last change. |
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166 * <p> |
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167 * <strong>Performance:</strong> Typing-style changes perform in constant time unless re-allocation |
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168 * becomes necessary. Generally, a change that does not cause re-allocation will cause at most one |
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169 * {@linkplain System#arraycopy(Object, int, Object, int, int) arraycopy} operation of a length of |
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170 * about <var>d</var>, where <var>d</var> is the distance from the previous change. Let <var>a(x)</var> |
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171 * be the algorithmic performance of an <code>arraycopy</code> operation of the length <var>x</var>, |
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172 * then such a change then performs in <i>O(a(x))</i>, |
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173 * {@linkplain #get(int, int) get(int, <var>length</var>)} performs in <i>O(a(length))</i>, |
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174 * {@link #get(int)} in <i>O(1)</i>. |
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175 * <p> |
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176 * How frequently the array needs re-allocation is controlled by the constructor parameters. |
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177 * </p> |
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178 * <p> |
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179 * This class is not intended to be subclassed. |
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180 * </p> |
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181 * |
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182 * @see CopyOnWriteTextStore for a copy-on-write text store wrapper |
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183 * @noextend This class is not intended to be subclassed by clients. |
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184 */ |
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185 public class GapTextStore : ITextStore { |
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186 /** |
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187 * The minimum gap size allocated when re-allocation occurs. |
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188 * @since 3.3 |
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189 */ |
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190 private const int fMinGapSize; |
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191 /** |
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192 * The maximum gap size allocated when re-allocation occurs. |
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193 * @since 3.3 |
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194 */ |
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195 private const int fMaxGapSize; |
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196 /** |
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197 * The multiplier to compute the array size from the content length |
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198 * (1 <= fSizeMultiplier <= 2). |
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199 * |
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200 * @since 3.3 |
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201 */ |
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202 private const float fSizeMultiplier; |
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203 |
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204 /** The store's content */ |
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205 private char[] fContent; |
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206 /** Starting index of the gap */ |
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207 private int fGapStart= 0; |
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208 /** End index of the gap */ |
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209 private int fGapEnd= 0; |
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210 /** |
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211 * The current high water mark. If a change would cause the gap to grow larger than this, the |
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212 * array is re-allocated. |
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213 * @since 3.3 |
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214 */ |
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215 private int fThreshold= 0; |
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216 |
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217 /** |
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218 * Creates a new empty text store using the specified low and high watermarks. |
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219 * |
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220 * @param lowWatermark unused - at the lower bound, the array is only resized when the content |
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221 * does not fit |
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222 * @param highWatermark if the gap is ever larger than this, it will automatically be shrunken |
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223 * (>= 0) |
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224 * @deprecated use {@link GapTextStore#GapTextStore(int, int, float)} instead |
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225 */ |
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226 public this(int lowWatermark, int highWatermark) { |
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227 /* |
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228 * Legacy constructor. The API contract states that highWatermark is the upper bound for the |
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229 * gap size. Albeit this contract was not previously adhered to, it is now: The allocated |
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230 * gap size is fixed at half the highWatermark. Since the threshold is always twice the |
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231 * allocated gap size, the gap will never grow larger than highWatermark. Previously, the |
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232 * gap size was initialized to highWatermark, causing re-allocation if the content length |
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233 * shrunk right after allocation. The fixed gap size is now only half of the previous value, |
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234 * circumventing that problem (there was no API contract specifying the initial gap size). |
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235 * |
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236 * The previous implementation did not allow the gap size to become smaller than |
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237 * lowWatermark, which doesn't make any sense: that area of the gap was simply never ever |
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238 * used. |
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239 */ |
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240 this(highWatermark / 2, highWatermark / 2, 0f); |
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241 } |
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242 |
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243 /** |
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244 * Equivalent to |
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245 * {@linkplain GapTextStore#GapTextStore(int, int, float) new GapTextStore(256, 4096, 0.1f)}. |
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246 * |
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247 * @since 3.3 |
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248 */ |
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249 public this() { |
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250 this(256, 4096, 0.1f); |
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251 } |
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252 |
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253 /** |
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254 * Creates an empty text store that uses re-allocation thresholds relative to the content |
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255 * length. Re-allocation is controlled by the <em>gap factor</em>, which is the quotient of |
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256 * the gap size and the array size. Re-allocation occurs if a change causes the gap factor to go |
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257 * outside <code>[0, maxGapFactor]</code>. When re-allocation occurs, the array is sized |
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258 * such that the gap factor is <code>0.5 * maxGapFactor</code>. The gap size computed in this |
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259 * manner is bounded by the <code>minSize</code> and <code>maxSize</code> parameters. |
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260 * <p> |
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261 * A <code>maxGapFactor</code> of <code>0</code> creates a text store that never has a gap |
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262 * at all (if <code>minSize</code> is 0); a <code>maxGapFactor</code> of <code>1</code> |
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263 * creates a text store that doubles its size with every re-allocation and that never shrinks. |
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264 * </p> |
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265 * <p> |
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266 * The <code>minSize</code> and <code>maxSize</code> parameters are absolute bounds to the |
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267 * allocated gap size. Use <code>minSize</code> to avoid frequent re-allocation for small |
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268 * documents. Use <code>maxSize</code> to avoid a huge gap being allocated for large |
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269 * documents. |
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270 * </p> |
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271 * |
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272 * @param minSize the minimum gap size to allocate (>= 0; use 0 for no minimum) |
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273 * @param maxSize the maximum gap size to allocate (>= minSize; use |
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274 * {@link Integer#MAX_VALUE} for no maximum) |
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275 * @param maxGapFactor is the maximum fraction of the array that is occupied by the gap (<code>0 <= maxGapFactor <= 1</code>) |
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276 * @since 3.3 |
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277 */ |
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278 public this(int minSize, int maxSize, float maxGapFactor) { |
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279 Assert.isLegal(0f <= maxGapFactor && maxGapFactor <= 1f); |
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280 Assert.isLegal(0 <= minSize && minSize <= maxSize); |
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281 fMinGapSize= minSize; |
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282 fMaxGapSize= maxSize; |
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283 fSizeMultiplier= 1 / (1 - maxGapFactor / 2); |
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284 } |
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285 |
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286 /* |
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287 * @see org.eclipse.jface.text.ITextStore#get(int) |
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288 */ |
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289 public final char get(int offset) { |
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290 if (offset < fGapStart) |
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291 return fContent[offset]; |
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292 |
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293 return fContent[offset + gapSize()]; |
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294 } |
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295 |
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296 /* |
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297 * @see org.eclipse.jface.text.ITextStore#get(int, int) |
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298 */ |
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299 public final String get(int offset, int length) { |
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300 if (fGapStart <= offset) |
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301 return new_String(fContent, offset + gapSize() , length); |
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302 |
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303 final int end= offset + length; |
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304 |
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305 if (end <= fGapStart) |
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306 return new_String(fContent, offset, length); |
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307 |
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308 StringBuffer buf= new StringBuffer(length); |
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309 buf.append(fContent[ offset .. fGapStart ]); |
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310 buf.append(fContent[ fGapEnd .. end - fGapStart + fGapEnd ]); |
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311 return buf.toString(); |
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312 } |
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313 |
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314 /* |
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315 * @see org.eclipse.jface.text.ITextStore#getLength() |
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316 */ |
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317 public final int getLength() { |
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318 return fContent.length - gapSize(); |
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319 } |
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320 |
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321 /* |
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322 * @see org.eclipse.jface.text.ITextStore#set(java.lang.String) |
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323 */ |
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324 public final void set(String text) { |
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325 /* |
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326 * Moves the gap to the end of the content. There is no sensible prediction of where the |
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327 * next change will occur, but at least the next change will not trigger re-allocation. This |
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328 * is especially important when using the GapTextStore within a CopyOnWriteTextStore, where |
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329 * the GTS is only initialized right before a modification. |
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330 */ |
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331 replace(0, getLength(), text); |
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332 } |
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333 |
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334 /* |
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335 * @see org.eclipse.jface.text.ITextStore#replace(int, int, java.lang.String) |
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336 */ |
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337 public final void replace(int offset, int length, String text) { |
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338 if (text is null) { |
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339 adjustGap(offset, length, 0); |
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340 } else { |
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341 int textLength= text.length; |
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342 adjustGap(offset, length, textLength); |
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343 if (textLength !is 0) |
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344 text.getChars(0, textLength, fContent, offset); |
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345 } |
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346 } |
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347 |
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348 /** |
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349 * Moves the gap to <code>offset + add</code>, moving any content after |
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350 * <code>offset + remove</code> behind the gap. The gap size is kept between 0 and |
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351 * {@link #fThreshold}, leading to re-allocation if needed. The content between |
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352 * <code>offset</code> and <code>offset + add</code> is undefined after this operation. |
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353 * |
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354 * @param offset the offset at which a change happens |
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355 * @param remove the number of character which are removed or overwritten at <code>offset</code> |
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356 * @param add the number of character which are inserted or overwriting at <code>offset</code> |
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357 */ |
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358 private void adjustGap(int offset, int remove, int add) { |
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359 final int oldGapSize= gapSize(); |
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360 final int newGapSize= oldGapSize - add + remove; |
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361 final bool reuseArray= 0 <= newGapSize && newGapSize <= fThreshold; |
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362 |
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363 final int newGapStart= offset + add; |
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364 int newGapEnd; |
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365 |
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366 if (reuseArray) |
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367 newGapEnd= moveGap(offset, remove, oldGapSize, newGapSize, newGapStart); |
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368 else |
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369 newGapEnd= reallocate(offset, remove, oldGapSize, newGapSize, newGapStart); |
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370 |
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371 fGapStart= newGapStart; |
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372 fGapEnd= newGapEnd; |
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373 } |
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374 |
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375 /** |
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376 * Moves the gap to <code>newGapStart</code>. |
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377 * |
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378 * @param offset the change offset |
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379 * @param remove the number of removed / overwritten characters |
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380 * @param oldGapSize the old gap size |
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381 * @param newGapSize the gap size after the change |
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382 * @param newGapStart the offset in the array to move the gap to |
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383 * @return the new gap end |
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384 * @since 3.3 |
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385 */ |
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386 private int moveGap(int offset, int remove, int oldGapSize, int newGapSize, int newGapStart) { |
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387 /* |
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388 * No re-allocation necessary. The area between the change offset and gap can be copied |
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389 * in at most one operation. Don't copy parts that will be overwritten anyway. |
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390 */ |
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391 final int newGapEnd= newGapStart + newGapSize; |
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392 if (offset < fGapStart) { |
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393 int afterRemove= offset + remove; |
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394 if (afterRemove < fGapStart) { |
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395 final int betweenSize= fGapStart - afterRemove; |
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396 arrayCopy(afterRemove, fContent, newGapEnd, betweenSize); |
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397 } |
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398 // otherwise, only the gap gets enlarged |
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399 } else { |
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400 final int offsetShifted= offset + oldGapSize; |
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401 final int betweenSize= offsetShifted - fGapEnd; // in the typing case, betweenSize is 0 |
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402 arrayCopy(fGapEnd, fContent, fGapStart, betweenSize); |
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403 } |
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404 return newGapEnd; |
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405 } |
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406 |
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407 /** |
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408 * Reallocates a new array and copies the data from the previous one. |
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409 * |
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410 * @param offset the change offset |
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411 * @param remove the number of removed / overwritten characters |
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412 * @param oldGapSize the old gap size |
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413 * @param newGapSize the gap size after the change if no re-allocation would occur (can be negative) |
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414 * @param newGapStart the offset in the array to move the gap to |
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415 * @return the new gap end |
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416 * @since 3.3 |
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417 */ |
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418 private int reallocate(int offset, int remove, int oldGapSize, int newGapSize, int newGapStart) { |
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419 // the new content length (without any gap) |
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420 final int newLength= fContent.length - newGapSize; |
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421 // the new array size based on the gap factor |
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422 int newArraySize= cast(int) (newLength * fSizeMultiplier); |
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423 newGapSize= newArraySize - newLength; |
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424 |
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425 // bound the gap size within min/max |
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426 if (newGapSize < fMinGapSize) { |
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427 newGapSize= fMinGapSize; |
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428 newArraySize= newLength + newGapSize; |
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429 } else if (newGapSize > fMaxGapSize) { |
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430 newGapSize= fMaxGapSize; |
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431 newArraySize= newLength + newGapSize; |
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432 } |
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433 |
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434 // the upper threshold is always twice the gapsize |
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435 fThreshold= newGapSize * 2; |
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436 final char[] newContent= allocate(newArraySize); |
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437 final int newGapEnd= newGapStart + newGapSize; |
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438 |
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439 /* |
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440 * Re-allocation: The old content can be copied in at most 3 operations to the newly allocated |
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441 * array. Either one of change offset and the gap may come first. |
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442 * - unchanged area before the change offset / gap |
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443 * - area between the change offset and the gap (either one may be first) |
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444 * - rest area after the change offset / after the gap |
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445 */ |
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446 if (offset < fGapStart) { |
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447 // change comes before gap |
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448 arrayCopy(0, newContent, 0, offset); |
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449 int afterRemove= offset + remove; |
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450 if (afterRemove < fGapStart) { |
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451 // removal is completely before the gap |
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452 final int betweenSize= fGapStart - afterRemove; |
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453 arrayCopy(afterRemove, newContent, newGapEnd, betweenSize); |
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454 final int restSize= fContent.length - fGapEnd; |
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455 arrayCopy(fGapEnd, newContent, newGapEnd + betweenSize, restSize); |
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456 } else { |
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457 // removal encompasses the gap |
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458 afterRemove += oldGapSize; |
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459 final int restSize= fContent.length - afterRemove; |
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460 arrayCopy(afterRemove, newContent, newGapEnd, restSize); |
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461 } |
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462 } else { |
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463 // gap comes before change |
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464 arrayCopy(0, newContent, 0, fGapStart); |
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465 final int offsetShifted= offset + oldGapSize; |
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466 final int betweenSize= offsetShifted - fGapEnd; |
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467 arrayCopy(fGapEnd, newContent, fGapStart, betweenSize); |
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468 final int afterRemove= offsetShifted + remove; |
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469 final int restSize= fContent.length - afterRemove; |
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470 arrayCopy(afterRemove, newContent, newGapEnd, restSize); |
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471 } |
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472 |
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473 fContent= newContent; |
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474 return newGapEnd; |
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475 } |
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476 |
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477 /** |
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478 * Allocates a new <code>char[size]</code>. |
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479 * |
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480 * @param size the length of the new array. |
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481 * @return a newly allocated char array |
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482 * @since 3.3 |
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483 */ |
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484 private char[] allocate(int size) { |
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485 return new char[size]; |
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486 } |
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487 |
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488 /* |
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489 * Executes System.arraycopy if length !is 0. A length < 0 cannot happen -> don't hide coding |
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490 * errors by checking for negative lengths. |
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491 * @since 3.3 |
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492 */ |
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493 private void arrayCopy(int srcPos, char[] dest, int destPos, int length) { |
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494 if (length !is 0) |
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495 System.arraycopy(fContent, srcPos, dest, destPos, length); |
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496 } |
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497 |
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498 /** |
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499 * Returns the gap size. |
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500 * |
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501 * @return the gap size |
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502 * @since 3.3 |
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503 */ |
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504 private int gapSize() { |
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505 return fGapEnd - fGapStart; |
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506 } |
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507 |
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508 /** |
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509 * Returns a copy of the content of this text store. |
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510 * For internal use only. |
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511 * |
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512 * @return a copy of the content of this text store |
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513 */ |
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514 protected String getContentAsString() { |
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515 return new_String(fContent); |
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516 } |
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517 |
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518 /** |
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519 * Returns the start index of the gap managed by this text store. |
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520 * For internal use only. |
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521 * |
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522 * @return the start index of the gap managed by this text store |
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523 */ |
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524 protected int getGapStartIndex() { |
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525 return fGapStart; |
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526 } |
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527 |
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528 /** |
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529 * Returns the end index of the gap managed by this text store. |
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530 * For internal use only. |
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531 * |
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532 * @return the end index of the gap managed by this text store |
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533 */ |
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534 protected int getGapEndIndex() { |
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535 return fGapEnd; |
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536 } |
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537 } |