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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*******************************************************************************
* Copyright (c) 2001, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.parser.regions;
import org.eclipse.wst.sse.core.internal.provisional.events.RegionChangedEvent;
import org.eclipse.wst.sse.core.internal.provisional.events.StructuredDocumentEvent;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.sse.core.internal.util.Debug;
import org.eclipse.wst.sse.core.internal.util.Utilities;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;
public class WhiteSpaceOnlyRegion implements ITextRegion {
static private final byte fTextLength = 0;
static private final String fType = DOMRegionContext.WHITE_SPACE;
protected int fLength;
protected int fStart;
public WhiteSpaceOnlyRegion(int start, int length) {
super();
fStart = start;
fLength = length;
}
public void adjust(int i) {
fStart += i;
}
public void adjustLength(int i) {
fLength += i;
}
public void adjustStart(int i) {
fStart += i;
}
public void adjustTextLength(int i) {
// not supported
}
public boolean contains(int position) {
return fStart <= position && position < fStart + fLength;
}
public void equatePositions(ITextRegion region) {
fStart = region.getStart();
fLength = region.getLength();
}
public int getEnd() {
return fStart + fLength;
}
public int getLength() {
return fLength;
}
public int getStart() {
return fStart;
}
public int getTextEnd() {
return fStart + fTextLength;
}
public int getTextLength() {
return fTextLength;
}
public String getType() {
return fType;
}
public void setLength(int i) {
fLength = i;
}
public void setStart(int i) {
fStart = i;
}
public void setTextLength(short i) {
throw new RuntimeException("invalid call"); //$NON-NLS-1$
}
public void setType(String string) {
throw new RuntimeException("invalid call"); //$NON-NLS-1$
}
public String toString() {
return RegionToStringUtil.toString(this);
}
/**
* For this ITextRegion type, the start must in terms of what the region
* expects ... that is, its not document offset, but start relative to
* what ever contains it.
*/
public StructuredDocumentEvent updateRegion(Object requester, IStructuredDocumentRegion parent, String changes, int requestStart, int lengthToReplace) {
// if the region is an easy type (e.g. attribute value),
// and the requested changes are all
// alphanumeric, then make the change here locally.
// (This can obviously be made more sophisticated as the need arises,
// but should
// always follow this pattern.)
if (Debug.debugStructuredDocument) {
System.out.println("\t\tContextRegion::updateModel"); //$NON-NLS-1$
System.out.println("\t\t\tregion type is " + fType); //$NON-NLS-1$
}
boolean canHandle = false;
// note: we'll always handle deletes from these
// regions ... if its already that region,
// deleting something from it won't change its
// type. (remember, the calling program needs
// to insure we are not called, if not all contained
// on one region.
if ((changes == null) || (changes.length() == 0)) {
// delete case
// We can not do the quick delete, if
// if all the text in a region is to be deleted.
// Or, if the delete starts in the white space region.
// In these cases, a reparse is needed.
// Minor note, we use textEnd-start since it always
// less than or equal to end-start. This might
// cause us to miss a few cases we could have handled,
// but will prevent us from trying to handle funning cases
// involving whitespace.
if ((fStart >= getTextEnd()) || (Math.abs(lengthToReplace) >= getTextEnd() - getStart())) {
canHandle = false;
}
else {
canHandle = true;
}
}
else {
if (RegionUpdateRule.canHandleAsWhiteSpace(this, parent, changes, requestStart, lengthToReplace)) {
canHandle = true;
}
else {
canHandle = false;
}
}
RegionChangedEvent result = null;
if (canHandle) {
// at this point, we still have the old region. We won't create a
// new instance, we'll just update the one we have, by changing
// its end postion,
// The parent flatnode, upon return, has responsibility
// for updating sibling regions.
// and in turn, the structuredDocument itself has responsibility
// for
// updating the text store and down stream flatnodes.
if (Debug.debugStructuredDocument) {
System.out.println("change handled by region"); //$NON-NLS-1$
}
int lengthDifference = Utilities.calculateLengthDifference(changes, lengthToReplace);
// Note: we adjust both end and text end, because for any change
// that is in only the trailing whitespace region, we should not
// do a quick change,
// so 'canHandle' should have been false for those case.
fLength += lengthDifference;
result = new RegionChangedEvent(parent.getParentDocument(), requester, parent, this, changes, requestStart, lengthToReplace);
}
return result;
}
}
|
