1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.examples.templateeditor.editors;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.presentation.IPresentationDamager;
import org.eclipse.jface.text.presentation.IPresentationRepairer;
public class NonRuleBasedDamagerRepairer implements IPresentationDamager, IPresentationRepairer {
/** The document this object works on */
protected IDocument fDocument;
/** The default text attribute if non is returned as data by the current token */
protected TextAttribute fDefaultTextAttribute;
/**
* Creates a new damager/repairer.
*
* @param defaultTextAttribute the default text attribute for all detected regions
*/
public NonRuleBasedDamagerRepairer(TextAttribute defaultTextAttribute) {
Assert.isNotNull(defaultTextAttribute);
fDefaultTextAttribute= defaultTextAttribute;
}
@Override
public void setDocument(IDocument document) {
fDocument= document;
}
/**
* Returns the end offset of the line that contains the specified offset or
* if the offset is inside a line delimiter, the end offset of the next
* line.
*
* @param offset the offset whose line end offset must be computed
* @return the line end offset for the given offset
* @exception BadLocationException if offset is invalid in the current document
*/
protected int endOfLineOf(int offset) throws BadLocationException {
IRegion info= fDocument.getLineInformationOfOffset(offset);
if (offset <= info.getOffset() + info.getLength())
return info.getOffset() + info.getLength();
int line= fDocument.getLineOfOffset(offset);
try {
info= fDocument.getLineInformation(line + 1);
return info.getOffset() + info.getLength();
} catch (BadLocationException x) {
return fDocument.getLength();
}
}
@Override
public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent event, boolean documentPartitioningChanged) {
if (!documentPartitioningChanged) {
try {
IRegion info= fDocument.getLineInformationOfOffset(event.getOffset());
int start= Math.max(partition.getOffset(), info.getOffset());
int end= event.getOffset() + (event.getText() == null ? event.getLength() : event.getText().length());
if (info.getOffset() <= end && end <= info.getOffset() + info.getLength()) {
// optimize the case of the same line
end= info.getOffset() + info.getLength();
} else
end= endOfLineOf(end);
end= Math.min(partition.getOffset() + partition.getLength(), end);
return new Region(start, end - start);
} catch (BadLocationException x) {
}
}
return partition;
}
@Override
public void createPresentation(TextPresentation presentation, ITypedRegion region) {
addRange(presentation, region.getOffset(), region.getLength(), fDefaultTextAttribute);
}
/**
* Adds style information to the given text presentation.
*
* @param presentation the text presentation to be extended
* @param offset the offset of the range to be styled
* @param length the length of the range to be styled
* @param attr the attribute describing the style of the range to be styled
*/
protected void addRange(TextPresentation presentation, int offset, int length, TextAttribute attr) {
if (attr != null)
presentation.addStyleRange(new StyleRange(offset, length, attr.getForeground(), attr.getBackground(), attr.getStyle()));
}
}
|
