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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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.jface.text.projection.FragmentUpdater;
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14
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131
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15 import dwtx.jface.text.projection.ProjectionMapping; // packageimport
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16 import dwtx.jface.text.projection.ChildDocumentManager; // packageimport
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17 import dwtx.jface.text.projection.SegmentUpdater; // packageimport
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18 import dwtx.jface.text.projection.Segment; // packageimport
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19 import dwtx.jface.text.projection.ProjectionDocument; // packageimport
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20 import dwtx.jface.text.projection.ProjectionDocumentEvent; // packageimport
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21 import dwtx.jface.text.projection.ChildDocument; // packageimport
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22 import dwtx.jface.text.projection.IMinimalMapping; // packageimport
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23 import dwtx.jface.text.projection.Fragment; // packageimport
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24 import dwtx.jface.text.projection.ProjectionTextStore; // packageimport
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25 import dwtx.jface.text.projection.ProjectionDocumentManager; // packageimport
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26
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27
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129
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28 import dwt.dwthelper.utils;
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29
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30
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31 import dwtx.jface.text.BadLocationException;
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32 import dwtx.jface.text.BadPositionCategoryException;
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33 import dwtx.jface.text.DefaultPositionUpdater;
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34 import dwtx.jface.text.DocumentEvent;
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35 import dwtx.jface.text.IDocument;
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36 import dwtx.jface.text.Position;
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37
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38
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39 /**
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40 * The position updater used to adapt the fragments of a master document. If an
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41 * insertion happens at a fragment's offset, the fragment is extended rather
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42 * than shifted. Also, the last fragment is extended if an insert operation
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43 * happens at the end of the fragment.
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44 *
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45 * @since 3.0
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46 */
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47 class FragmentUpdater : DefaultPositionUpdater {
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48
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49 /** Indicates whether the position being updated represents the last fragment. */
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50 private bool fIsLast= false;
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51
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52 /**
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53 * Creates the fragment updater for the given category.
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54 *
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55 * @param fragmentCategory the position category used for managing the fragments of a document
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56 */
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57 protected FragmentUpdater(String fragmentCategory) {
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58 super(fragmentCategory);
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59 }
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60
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61 /*
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62 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
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63 */
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64 public void update(DocumentEvent event) {
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65
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66 try {
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67
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68 Position[] category= event.getDocument().getPositions(getCategory());
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69
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70 fOffset= event.getOffset();
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71 fLength= event.getLength();
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72 fReplaceLength= (event.getText() is null ? 0 : event.getText().length());
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73 fDocument= event.getDocument();
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74
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75 for (int i= 0; i < category.length; i++) {
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76
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77 fPosition= category[i];
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78 fIsLast= (i is category.length -1);
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79
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80 fOriginalPosition.offset= fPosition.offset;
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81 fOriginalPosition.length= fPosition.length;
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82
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83 if (notDeleted())
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84 adaptToReplace();
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85 }
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86
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87 } catch (BadPositionCategoryException x) {
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88 // do nothing
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89 }
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90 }
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91
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92 /*
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93 * @see dwtx.jface.text.DefaultPositionUpdater#adaptToInsert()
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94 */
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95 protected void adaptToInsert() {
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96 int myStart= fPosition.offset;
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97 int myEnd= Math.max(myStart, fPosition.offset + fPosition.length - (fIsLast || isAffectingReplace() ? 0 : 1));
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98
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99 if (myEnd < fOffset)
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100 return;
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101
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102 if (fLength <= 0) {
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103
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104 if (myStart <= fOffset)
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105 fPosition.length += fReplaceLength;
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106 else
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107 fPosition.offset += fReplaceLength;
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108
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109 } else {
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110
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111 if (myStart <= fOffset && fOriginalPosition.offset <= fOffset)
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112 fPosition.length += fReplaceLength;
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113 else
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114 fPosition.offset += fReplaceLength;
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115 }
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116 }
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117
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118 /**
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119 * Returns whether this updater considers any position affected by the given document event. A
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120 * position is affected if <code>event</code> {@link Position#overlapsWith(int, int) overlaps}
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121 * with it but not if the position is only shifted.
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122 *
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123 * @param event the event
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124 * @return <code>true</code> if there is any affected position, <code>false</code> otherwise
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125 */
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126 public bool affectsPositions(DocumentEvent event) {
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127 IDocument document= event.getDocument();
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128 try {
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129
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130 int index= document.computeIndexInCategory(getCategory(), event.getOffset());
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131 Position[] fragments= document.getPositions(getCategory());
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132
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133 if (0 < index) {
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134 Position fragment= fragments[index - 1];
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135 if (fragment.overlapsWith(event.getOffset(), event.getLength()))
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136 return true;
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137 if (index is fragments.length && fragment.offset + fragment.length is event.getOffset())
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138 return true;
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139 }
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140
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141 if (index < fragments.length) {
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142 Position fragment= fragments[index];
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143 return fragment.overlapsWith(event.getOffset(), event.getLength());
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144 }
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145
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146 } catch (BadLocationException x) {
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147 } catch (BadPositionCategoryException x) {
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148 }
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149
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150 return false;
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151 }
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152 }
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