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1 /*******************************************************************************
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2 * Copyright (c) 2005, 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.jface.text.DefaultTextHover;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import java.util.Iterator;
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18
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19 import dwtx.core.runtime.Assert;
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20 import dwtx.jface.text.source.Annotation;
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21 import dwtx.jface.text.source.IAnnotationModel;
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22 import dwtx.jface.text.source.ISourceViewer;
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23 import dwtx.jface.text.source.ISourceViewerExtension2;
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24
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25 /**
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26 * Standard implementation of {@link dwtx.jface.text.ITextHover}.
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27 *
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28 * @since 3.2
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29 */
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30 public class DefaultTextHover : ITextHover {
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31
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32 /** This hover's source viewer */
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33 private ISourceViewer fSourceViewer;
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34
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35 /**
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36 * Creates a new annotation hover.
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37 *
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38 * @param sourceViewer this hover's annotation model
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39 */
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40 public DefaultTextHover(ISourceViewer sourceViewer) {
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41 Assert.isNotNull(sourceViewer);
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42 fSourceViewer= sourceViewer;
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43 }
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44
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45 /*
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46 * @see dwtx.jface.text.ITextHover#getHoverInfo(dwtx.jface.text.ITextViewer, dwtx.jface.text.IRegion)
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47 */
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48 public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
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49 IAnnotationModel model= getAnnotationModel(fSourceViewer);
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50 if (model is null)
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51 return null;
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52
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53 Iterator e= model.getAnnotationIterator();
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54 while (e.hasNext()) {
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55 Annotation a= (Annotation) e.next();
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56 if (isIncluded(a)) {
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57 Position p= model.getPosition(a);
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58 if (p !is null && p.overlapsWith(hoverRegion.getOffset(), hoverRegion.getLength())) {
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59 String msg= a.getText();
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60 if (msg !is null && msg.trim().length() > 0)
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61 return msg;
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62 }
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63 }
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64 }
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65
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66 return null;
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67 }
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68
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69 /*
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70 * @see dwtx.jface.text.ITextHover#getHoverRegion(dwtx.jface.text.ITextViewer, int)
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71 */
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72 public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
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73 return findWord(textViewer.getDocument(), offset);
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74 }
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75
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76 /**
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77 * Tells whether the annotation should be included in
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78 * the computation.
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79 *
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80 * @param annotation the annotation to test
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81 * @return <code>true</code> if the annotation is included in the computation
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82 */
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83 protected bool isIncluded(Annotation annotation) {
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84 return true;
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85 }
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86
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87 private IAnnotationModel getAnnotationModel(ISourceViewer viewer) {
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88 if (viewer instanceof ISourceViewerExtension2) {
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89 ISourceViewerExtension2 extension= (ISourceViewerExtension2) viewer;
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90 return extension.getVisualAnnotationModel();
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91 }
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92 return viewer.getAnnotationModel();
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93 }
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94
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95 private IRegion findWord(IDocument document, int offset) {
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96 int start= -2;
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97 int end= -1;
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98
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99 try {
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100
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101 int pos= offset;
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102 char c;
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103
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104 while (pos >= 0) {
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105 c= document.getChar(pos);
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106 if (!Character.isUnicodeIdentifierPart(c))
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107 break;
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108 --pos;
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109 }
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110
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111 start= pos;
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112
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113 pos= offset;
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114 int length= document.getLength();
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115
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116 while (pos < length) {
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117 c= document.getChar(pos);
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118 if (!Character.isUnicodeIdentifierPart(c))
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119 break;
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120 ++pos;
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121 }
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122
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123 end= pos;
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124
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125 } catch (BadLocationException x) {
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126 }
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127
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128 if (start >= -1 && end > -1) {
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129 if (start is offset && end is offset)
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130 return new Region(offset, 0);
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131 else if (start is offset)
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132 return new Region(start, end - start);
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133 else
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134 return new Region(start + 1, end - start - 1);
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135 }
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136
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137 return null;
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138 }
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139 }
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