blob: c357f3638eb53aa9808cd695d7ca0bef4a61e317 (
plain) (
blame)
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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.projection;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.BadPositionCategoryException;
import org.eclipse.jface.text.DefaultPositionUpdater;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.Position;
/**
* The position updater used to adapt the fragments of a master document. If an
* insertion happens at a fragment's offset, the fragment is extended rather
* than shifted. Also, the last fragment is extended if an insert operation
* happens at the end of the fragment.
*
* @since 3.0
*/
class FragmentUpdater extends DefaultPositionUpdater {
/** Indicates whether the position being updated represents the last fragment. */
private boolean fIsLast= false;
/**
* Creates the fragment updater for the given category.
*
* @param fragmentCategory the position category used for managing the fragments of a document
*/
protected FragmentUpdater(String fragmentCategory) {
super(fragmentCategory);
}
/*
* @see org.eclipse.jface.text.IPositionUpdater#update(org.eclipse.jface.text.DocumentEvent)
*/
public void update(DocumentEvent event) {
try {
Position[] category= event.getDocument().getPositions(getCategory());
fOffset= event.getOffset();
fLength= event.getLength();
fReplaceLength= (event.getText() == null ? 0 : event.getText().length());
fDocument= event.getDocument();
for (int i= 0; i < category.length; i++) {
fPosition= category[i];
fIsLast= (i == category.length -1);
fOriginalPosition.offset= fPosition.offset;
fOriginalPosition.length= fPosition.length;
if (notDeleted())
adaptToReplace();
}
} catch (BadPositionCategoryException x) {
// do nothing
}
}
/*
* @see org.eclipse.jface.text.DefaultPositionUpdater#adaptToInsert()
*/
protected void adaptToInsert() {
int myStart= fPosition.offset;
int myEnd= Math.max(myStart, fPosition.offset + fPosition.length - (fIsLast || isAffectingReplace() ? 0 : 1));
if (myEnd < fOffset)
return;
if (fLength <= 0) {
if (myStart <= fOffset)
fPosition.length += fReplaceLength;
else
fPosition.offset += fReplaceLength;
} else {
if (myStart <= fOffset && fOriginalPosition.offset <= fOffset)
fPosition.length += fReplaceLength;
else
fPosition.offset += fReplaceLength;
}
}
/**
* Returns whether this updater considers any position affected by the given
* document event. A position is affected if either the offset or the length
* of the position is modified but the position is not just shifted.
*
* @param event the event
* @return <code>true</code> if there is any affected position,
* <code>false</code> otherwise
*/
public boolean affectsPositions(DocumentEvent event) {
IDocument document= event.getDocument();
try {
int index= document.computeIndexInCategory(getCategory(), event.getOffset());
Position[] fragments= document.getPositions(getCategory());
if (0 < index) {
Position fragment= fragments[index - 1];
if (fragment.overlapsWith(event.getOffset(), event.getLength()))
return true;
if (fragment.offset + fragment.length == event.getOffset())
return index == fragments.length;
}
if (index < fragments.length) {
Position fragment= fragments[index];
return fragment.overlapsWith(event.getOffset(), event.getLength());
}
} catch (BadLocationException x) {
} catch (BadPositionCategoryException x) {
}
return false;
}
}
|
