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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 dwtx.text.edits.UndoEdit;
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14
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131
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15 import dwtx.text.edits.MultiTextEdit; // packageimport
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16 import dwtx.text.edits.CopySourceEdit; // packageimport
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17 import dwtx.text.edits.MoveSourceEdit; // packageimport
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18 import dwtx.text.edits.CopyingRangeMarker; // packageimport
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19 import dwtx.text.edits.ReplaceEdit; // packageimport
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20 import dwtx.text.edits.EditDocument; // packageimport
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21 import dwtx.text.edits.UndoCollector; // packageimport
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22 import dwtx.text.edits.DeleteEdit; // packageimport
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23 import dwtx.text.edits.MoveTargetEdit; // packageimport
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24 import dwtx.text.edits.CopyTargetEdit; // packageimport
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25 import dwtx.text.edits.TextEditCopier; // packageimport
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26 import dwtx.text.edits.ISourceModifier; // packageimport
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27 import dwtx.text.edits.TextEditMessages; // packageimport
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28 import dwtx.text.edits.TextEditProcessor; // packageimport
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29 import dwtx.text.edits.MalformedTreeException; // packageimport
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30 import dwtx.text.edits.TreeIterationInfo; // packageimport
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31 import dwtx.text.edits.TextEditVisitor; // packageimport
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32 import dwtx.text.edits.TextEditGroup; // packageimport
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33 import dwtx.text.edits.TextEdit; // packageimport
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34 import dwtx.text.edits.RangeMarker; // packageimport
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35 import dwtx.text.edits.InsertEdit; // packageimport
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36
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37
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129
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38 import dwt.dwthelper.utils;
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39
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40 import java.util.ArrayList;
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41 import java.util.List;
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42
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43 import dwtx.jface.text.BadLocationException;
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44 import dwtx.jface.text.IDocument;
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45
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46
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47 /**
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48 * This class encapsulates the reverse changes of an executed text
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49 * edit tree. To apply an undo memento to a document use method
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50 * <code>apply(IDocument)</code>.
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51 * <p>
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52 * Clients can't add additional children to an undo edit nor can they
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53 * add an undo edit as a child to another edit. Doing so results in
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54 * both cases in a <code>MalformedTreeException<code>.
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55 *
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56 * @since 3.0
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57 * @noinstantiate This class is not intended to be instantiated by clients.
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58 */
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59 public final class UndoEdit : TextEdit {
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60
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130
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61 this() {
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129
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62 super(0, Integer.MAX_VALUE);
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63 }
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64
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130
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65 private this(UndoEdit other) {
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129
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66 super(other);
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67 }
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68
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69 /*
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70 * @see dwtx.text.edits.TextEdit#internalAdd(dwtx.text.edits.TextEdit)
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71 */
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72 void internalAdd(TextEdit child) throws MalformedTreeException {
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73 throw new MalformedTreeException(null, this, TextEditMessages.getString("UndoEdit.no_children")); //$NON-NLS-1$
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74 }
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75
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76 /*
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77 * @see dwtx.text.edits.MultiTextEdit#aboutToBeAdded(dwtx.text.edits.TextEdit)
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78 */
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79 void aboutToBeAdded(TextEdit parent) {
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80 throw new MalformedTreeException(parent, this, TextEditMessages.getString("UndoEdit.can_not_be_added")); //$NON-NLS-1$
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81 }
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82
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83 UndoEdit dispatchPerformEdits(TextEditProcessor processor) throws BadLocationException {
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84 return processor.executeUndo();
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85 }
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86
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87 void dispatchCheckIntegrity(TextEditProcessor processor) throws MalformedTreeException {
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88 processor.checkIntegrityUndo();
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89 }
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90
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91 /*
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92 * @see dwtx.text.edits.TextEdit#doCopy()
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93 */
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94 protected TextEdit doCopy() {
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95 return new UndoEdit(this);
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96 }
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97
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98 /*
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99 * @see TextEdit#accept0
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100 */
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101 protected void accept0(TextEditVisitor visitor) {
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102 bool visitChildren= visitor.visit(this);
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103 if (visitChildren) {
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104 acceptChildren(visitor);
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105 }
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106 }
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107
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108 /*
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109 * @see TextEdit#performDocumentUpdating
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110 */
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111 int performDocumentUpdating(IDocument document) throws BadLocationException {
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112 fDelta= 0;
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113 return fDelta;
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114 }
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115
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116 void add(ReplaceEdit edit) {
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117 List children= internalGetChildren();
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118 if (children is null) {
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119 children= new ArrayList(2);
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120 internalSetChildren(children);
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121 }
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122 children.add(edit);
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123 }
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124
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125 void defineRegion(int offset, int length) {
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126 internalSetOffset(offset);
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127 internalSetLength(length);
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128 }
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129
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130 bool deleteChildren() {
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131 return false;
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132 }
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133 }
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134
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