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comparison dwtx/jface/text/reconciler/DirtyRegion.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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children c4fb132a086c
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 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.reconciler.DirtyRegion;
14
15 import dwt.dwthelper.utils;
16
17 import dwtx.jface.text.ITypedRegion;
18
19
20 /**
21 * A dirty region describes a document range which has been changed.
22 */
23 public class DirtyRegion : ITypedRegion {
24
25 /**
26 * Identifies an insert operation.
27 */
28 final static public String INSERT= "__insert"; //$NON-NLS-1$
29 /**
30 * Identifies a remove operation.
31 */
32 final static public String REMOVE= "__remove"; //$NON-NLS-1$
33
34 /** The region's offset. */
35 private int fOffset;
36 /** The region's length. */
37 private int fLength;
38 /** Indicates the type of the applied change. */
39 private String fType;
40 /** The text which has been inserted. */
41 private String fText;
42
43 /**
44 * Creates a new dirty region.
45 *
46 * @param offset the offset within the document where the change occurred
47 * @param length the length of the text within the document that changed
48 * @param type the type of change that this region represents: {@link #INSERT} {@link #REMOVE}
49 * @param text the substitution text
50 */
51 public DirtyRegion(int offset, int length, String type, String text) {
52 fOffset= offset;
53 fLength= length;
54 fType= normalizeTypeValue(type);
55 fText= text;
56 }
57
58 /**
59 * Computes the normalized type value to ensure that the implementation can use object identity rather
60 * than equality.
61 *
62 * @param type the type value
63 * @return the normalized type value or <code>null</code>
64 * @since 3.1
65 */
66 private String normalizeTypeValue(String type) {
67 if (INSERT.equals(type))
68 return INSERT;
69 if (REMOVE.equals(type))
70 return REMOVE;
71 return null;
72 }
73
74 /*
75 * @see ITypedRegion#getOffset()
76 */
77 public int getOffset() {
78 return fOffset;
79 }
80
81 /*
82 * @see ITypedRegion#getLength()
83 */
84 public int getLength() {
85 return fLength;
86 }
87
88 /*
89 * @see ITypedRegion#getType
90 */
91 public String getType() {
92 return fType;
93 }
94
95 /**
96 * Returns the text that changed as part of the region change.
97 *
98 * @return the changed text
99 */
100 public String getText() {
101 return fText;
102 }
103
104 /**
105 * Modify the receiver so that it encompasses the region specified by the dirty region.
106 *
107 * @param dr the dirty region with which to merge
108 */
109 void mergeWith(DirtyRegion dr) {
110 int start= Math.min(fOffset, dr.fOffset);
111 int end= Math.max(fOffset + fLength, dr.fOffset + dr.fLength);
112 fOffset= start;
113 fLength= end - start;
114 fText= (dr.fText is null ? fText : (fText is null) ? dr.fText : fText + dr.fText);
115 }
116 }