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comparison dwtx/jface/text/Document.d @ 129:eb30df5ca28b

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Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.jface.text.Document;
14
15 import dwt.dwthelper.utils;
16
17
18 /**
19 * Default document implementation. Uses a {@link dwtx.jface.text.GapTextStore} wrapped
20 * inside a {@link dwtx.jface.text.CopyOnWriteTextStore} as text store.
21 * <p>
22 * The used line tracker considers the following strings as line delimiters: "\n", "\r", "\r\n".
23 * </p>
24 * <p>
25 * The document is ready to use. It has a default position category for which a default position
26 * updater is installed.
27 * </p>
28 * <p>
29 * <strong>Performance:</strong> The implementation should perform reasonably well for typical
30 * source code documents. It is not designed for very large documents of a size of several
31 * megabytes. Space-saving implementations are initially used for both the text store and the line
32 * tracker; the first modification after a {@link #set(String) set} incurs the cost to transform the
33 * document structures to efficiently handle updates.
34 * </p>
35 * <p>
36 * See {@link GapTextStore} and <code>TreeLineTracker</code> for algorithmic behavior of the used
37 * document structures.
38 * </p>
39 *
40 * @see dwtx.jface.text.GapTextStore
41 * @see dwtx.jface.text.CopyOnWriteTextStore
42 */
43 public class Document : AbstractDocument {
44 /**
45 * Creates a new empty document.
46 */
47 public Document() {
48 super();
49 setTextStore(new CopyOnWriteTextStore(new GapTextStore()));
50 setLineTracker(new DefaultLineTracker());
51 completeInitialization();
52 }
53
54 /**
55 * Creates a new document with the given initial content.
56 *
57 * @param initialContent the document's initial content
58 */
59 public Document(String initialContent) {
60 super();
61 setTextStore(new CopyOnWriteTextStore(new GapTextStore()));
62 setLineTracker(new DefaultLineTracker());
63 getStore().set(initialContent);
64 getTracker().set(initialContent);
65 completeInitialization();
66 }
67
68 /*
69 * @see dwtx.jface.text.IRepairableDocumentExtension#isLineInformationRepairNeeded(int, int, java.lang.String)
70 * @since 3.4
71 */
72 public bool isLineInformationRepairNeeded(int offset, int length, String text) throws BadLocationException {
73 if ((0 > offset) || (0 > length) || (offset + length > getLength()))
74 throw new BadLocationException();
75
76 return isLineInformationRepairNeeded(text) || isLineInformationRepairNeeded(get(offset, length));
77 }
78
79 /**
80 * Checks whether the line information needs to be repaired.
81 *
82 * @param text the text to check
83 * @return <code>true</code> if the line information must be repaired
84 * @since 3.4
85 */
86 private bool isLineInformationRepairNeeded(String text) {
87 if (text is null)
88 return false;
89
90 int length= text.length();
91 if (length is 0)
92 return false;
93
94 int rIndex= text.indexOf('\r');
95 int nIndex= text.indexOf('\n');
96 if (rIndex is -1 && nIndex is -1)
97 return false;
98
99 if (rIndex > 0 && rIndex < length-1 && nIndex > 1 && rIndex < length-2)
100 return false;
101
102 String defaultLD= null;
103 try {
104 defaultLD= getLineDelimiter(0);
105 } catch (BadLocationException x) {
106 return true;
107 }
108
109 if (defaultLD is null)
110 return false;
111
112 defaultLD= getDefaultLineDelimiter();
113
114 if (defaultLD.length() is 1) {
115 if (rIndex !is -1 && !"\r".equals(defaultLD)) //$NON-NLS-1$
116 return true;
117 if (nIndex !is -1 && !"\n".equals(defaultLD)) //$NON-NLS-1$
118 return true;
119 } else if (defaultLD.length() is 2)
120 return rIndex is -1 || nIndex - rIndex !is 1;
121
122 return false;
123 }
124
125 }