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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 * Benjamin Muskalla <b.muskalla@gmx.net> - https://bugs.eclipse.org/bugs/show_bug.cgi?id=156433
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11 * Port to the D programming language:
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12 * Frank Benoit <benoit@tionex.de>
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13 *******************************************************************************/
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14 module dwtx.jface.text.hyperlink.URLHyperlinkDetector;
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15
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16 import dwt.dwthelper.utils;
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17
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18 import java.net.MalformedURLException;
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19 import java.net.URL;
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20 import java.util.StringTokenizer;
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21
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22 import dwtx.jface.text.BadLocationException;
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23 import dwtx.jface.text.IDocument;
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24 import dwtx.jface.text.IRegion;
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25 import dwtx.jface.text.ITextViewer;
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26 import dwtx.jface.text.Region;
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27
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28
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29 /**
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30 * URL hyperlink detector.
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31 *
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32 * @since 3.1
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33 */
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34 public class URLHyperlinkDetector : AbstractHyperlinkDetector {
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35
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36
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37 /**
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38 * Creates a new URL hyperlink detector.
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39 *
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40 * @since 3.2
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41 */
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42 public URLHyperlinkDetector() {
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43 }
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44
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45 /**
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46 * Creates a new URL hyperlink detector.
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47 *
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48 * @param textViewer the text viewer in which to detect the hyperlink
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49 * @deprecated As of 3.2, replaced by {@link URLHyperlinkDetector}
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50 */
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51 public URLHyperlinkDetector(ITextViewer textViewer) {
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52 }
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53
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54 /*
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55 * @see dwtx.jface.text.hyperlink.IHyperlinkDetector#detectHyperlinks(dwtx.jface.text.ITextViewer, dwtx.jface.text.IRegion, bool)
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56 */
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57 public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, bool canShowMultipleHyperlinks) {
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58 if (region is null || textViewer is null)
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59 return null;
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60
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61 IDocument document= textViewer.getDocument();
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62
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63 int offset= region.getOffset();
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64
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65 String urlString= null;
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66 if (document is null)
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67 return null;
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68
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69 IRegion lineInfo;
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70 String line;
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71 try {
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72 lineInfo= document.getLineInformationOfOffset(offset);
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73 line= document.get(lineInfo.getOffset(), lineInfo.getLength());
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74 } catch (BadLocationException ex) {
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75 return null;
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76 }
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77
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78 int offsetInLine= offset - lineInfo.getOffset();
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79
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80 bool startDoubleQuote= false;
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81 int urlOffsetInLine= 0;
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82 int urlLength= 0;
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83
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84 int urlSeparatorOffset= line.indexOf("://"); //$NON-NLS-1$
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85 while (urlSeparatorOffset >= 0) {
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86
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87 // URL protocol (left to "://")
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88 urlOffsetInLine= urlSeparatorOffset;
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89 char ch;
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90 do {
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91 urlOffsetInLine--;
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92 ch= ' ';
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93 if (urlOffsetInLine > -1)
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94 ch= line.charAt(urlOffsetInLine);
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95 startDoubleQuote= ch is '"';
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96 } while (Character.isUnicodeIdentifierStart(ch));
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97 urlOffsetInLine++;
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98
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99 // Right to "://"
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100 StringTokenizer tokenizer= new StringTokenizer(line.substring(urlSeparatorOffset + 3), " \t\n\r\f<>", false); //$NON-NLS-1$
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101 if (!tokenizer.hasMoreTokens())
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102 return null;
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103
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104 urlLength= tokenizer.nextToken().length() + 3 + urlSeparatorOffset - urlOffsetInLine;
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105 if (offsetInLine >= urlOffsetInLine && offsetInLine <= urlOffsetInLine + urlLength)
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106 break;
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107
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108 urlSeparatorOffset= line.indexOf("://", urlSeparatorOffset + 1); //$NON-NLS-1$
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109 }
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110
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111 if (urlSeparatorOffset < 0)
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112 return null;
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113
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114 if (startDoubleQuote) {
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115 int endOffset= -1;
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116 int nextDoubleQuote= line.indexOf('"', urlOffsetInLine);
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117 int nextWhitespace= line.indexOf(' ', urlOffsetInLine);
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118 if (nextDoubleQuote !is -1 && nextWhitespace !is -1)
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119 endOffset= Math.min(nextDoubleQuote, nextWhitespace);
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120 else if (nextDoubleQuote !is -1)
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121 endOffset= nextDoubleQuote;
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122 else if (nextWhitespace !is -1)
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123 endOffset= nextWhitespace;
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124 if (endOffset !is -1)
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125 urlLength= endOffset - urlOffsetInLine;
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126 }
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127
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128 // Set and validate URL string
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129 try {
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130 urlString= line.substring(urlOffsetInLine, urlOffsetInLine + urlLength);
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131 new URL(urlString);
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132 } catch (MalformedURLException ex) {
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133 urlString= null;
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134 return null;
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135 }
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136
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137 IRegion urlRegion= new Region(lineInfo.getOffset() + urlOffsetInLine, urlLength);
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138 return new IHyperlink[] {new URLHyperlink(urlRegion, urlString)};
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139 }
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140
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141 }
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