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comparison dwtx/jface/text/DefaultIndentLineAutoEditStrategy.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, 2008 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.DefaultIndentLineAutoEditStrategy;
14
15 import dwt.dwthelper.utils;
16
17
18 /**
19 * This strategy always copies the indentation of the previous line.
20 * <p>
21 * This class is not intended to be subclassed.</p>
22 *
23 * @since 3.1
24 */
25 public class DefaultIndentLineAutoEditStrategy : IAutoEditStrategy {
26
27 /**
28 * Creates a new indent line auto edit strategy which can be installed on
29 * text viewers.
30 */
31 public DefaultIndentLineAutoEditStrategy() {
32 }
33
34 /**
35 * Returns the first offset greater than <code>offset</code> and smaller than
36 * <code>end</code> whose character is not a space or tab character. If no such
37 * offset is found, <code>end</code> is returned.
38 *
39 * @param document the document to search in
40 * @param offset the offset at which searching start
41 * @param end the offset at which searching stops
42 * @return the offset in the specified range whose character is not a space or tab
43 * @exception BadLocationException if position is an invalid range in the given document
44 */
45 protected int findEndOfWhiteSpace(IDocument document, int offset, int end) throws BadLocationException {
46 while (offset < end) {
47 char c= document.getChar(offset);
48 if (c !is ' ' && c !is '\t') {
49 return offset;
50 }
51 offset++;
52 }
53 return end;
54 }
55
56 /**
57 * Copies the indentation of the previous line.
58 *
59 * @param d the document to work on
60 * @param c the command to deal with
61 */
62 private void autoIndentAfterNewLine(IDocument d, DocumentCommand c) {
63
64 if (c.offset is -1 || d.getLength() is 0)
65 return;
66
67 try {
68 // find start of line
69 int p= (c.offset is d.getLength() ? c.offset - 1 : c.offset);
70 IRegion info= d.getLineInformationOfOffset(p);
71 int start= info.getOffset();
72
73 // find white spaces
74 int end= findEndOfWhiteSpace(d, start, c.offset);
75
76 StringBuffer buf= new StringBuffer(c.text);
77 if (end > start) {
78 // append to input
79 buf.append(d.get(start, end - start));
80 }
81
82 c.text= buf.toString();
83
84 } catch (BadLocationException excp) {
85 // stop work
86 }
87 }
88
89 /*
90 * @see dwtx.jface.text.IAutoEditStrategy#customizeDocumentCommand(dwtx.jface.text.IDocument, dwtx.jface.text.DocumentCommand)
91 */
92 public void customizeDocumentCommand(IDocument d, DocumentCommand c) {
93 if (c.length is 0 && c.text !is null && TextUtilities.endsWith(d.getLegalLineDelimiters(), c.text) !is -1)
94 autoIndentAfterNewLine(d, c);
95 }
96 }