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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 * 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.Document;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 /**
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19 * Default document implementation. Uses a {@link dwtx.jface.text.GapTextStore} wrapped
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20 * inside a {@link dwtx.jface.text.CopyOnWriteTextStore} as text store.
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21 * <p>
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22 * The used line tracker considers the following strings as line delimiters: "\n", "\r", "\r\n".
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23 * </p>
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24 * <p>
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25 * The document is ready to use. It has a default position category for which a default position
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26 * updater is installed.
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27 * </p>
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28 * <p>
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29 * <strong>Performance:</strong> The implementation should perform reasonably well for typical
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30 * source code documents. It is not designed for very large documents of a size of several
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31 * megabytes. Space-saving implementations are initially used for both the text store and the line
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32 * tracker; the first modification after a {@link #set(String) set} incurs the cost to transform the
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33 * document structures to efficiently handle updates.
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34 * </p>
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35 * <p>
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36 * See {@link GapTextStore} and <code>TreeLineTracker</code> for algorithmic behavior of the used
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37 * document structures.
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38 * </p>
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39 *
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40 * @see dwtx.jface.text.GapTextStore
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41 * @see dwtx.jface.text.CopyOnWriteTextStore
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42 */
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43 public class Document : AbstractDocument {
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44 /**
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45 * Creates a new empty document.
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46 */
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47 public Document() {
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48 super();
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49 setTextStore(new CopyOnWriteTextStore(new GapTextStore()));
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50 setLineTracker(new DefaultLineTracker());
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51 completeInitialization();
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52 }
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53
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54 /**
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55 * Creates a new document with the given initial content.
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56 *
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57 * @param initialContent the document's initial content
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58 */
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59 public Document(String initialContent) {
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60 super();
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61 setTextStore(new CopyOnWriteTextStore(new GapTextStore()));
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62 setLineTracker(new DefaultLineTracker());
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63 getStore().set(initialContent);
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64 getTracker().set(initialContent);
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65 completeInitialization();
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66 }
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67
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68 /*
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69 * @see dwtx.jface.text.IRepairableDocumentExtension#isLineInformationRepairNeeded(int, int, java.lang.String)
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70 * @since 3.4
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71 */
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72 public bool isLineInformationRepairNeeded(int offset, int length, String text) throws BadLocationException {
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73 if ((0 > offset) || (0 > length) || (offset + length > getLength()))
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74 throw new BadLocationException();
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75
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76 return isLineInformationRepairNeeded(text) || isLineInformationRepairNeeded(get(offset, length));
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77 }
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78
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79 /**
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80 * Checks whether the line information needs to be repaired.
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81 *
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82 * @param text the text to check
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83 * @return <code>true</code> if the line information must be repaired
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84 * @since 3.4
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85 */
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86 private bool isLineInformationRepairNeeded(String text) {
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87 if (text is null)
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88 return false;
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89
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90 int length= text.length();
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91 if (length is 0)
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92 return false;
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93
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94 int rIndex= text.indexOf('\r');
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95 int nIndex= text.indexOf('\n');
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96 if (rIndex is -1 && nIndex is -1)
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97 return false;
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98
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99 if (rIndex > 0 && rIndex < length-1 && nIndex > 1 && rIndex < length-2)
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100 return false;
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101
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102 String defaultLD= null;
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103 try {
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104 defaultLD= getLineDelimiter(0);
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105 } catch (BadLocationException x) {
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106 return true;
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107 }
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108
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109 if (defaultLD is null)
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110 return false;
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111
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112 defaultLD= getDefaultLineDelimiter();
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113
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114 if (defaultLD.length() is 1) {
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115 if (rIndex !is -1 && !"\r".equals(defaultLD)) //$NON-NLS-1$
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116 return true;
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117 if (nIndex !is -1 && !"\n".equals(defaultLD)) //$NON-NLS-1$
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118 return true;
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119 } else if (defaultLD.length() is 2)
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120 return rIndex is -1 || nIndex - rIndex !is 1;
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121
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122 return false;
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123 }
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124
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125 }
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