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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*******************************************************************************
* Copyright (c) 2000, 2010 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
* QNX Software System
* Anton Leherbauer (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.jface.text.source.DefaultCharacterPairMatcher;
import org.eclipse.jface.text.source.ICharacterPairMatcher;
import org.eclipse.cdt.core.dom.ILinkage;
import org.eclipse.cdt.core.model.ILanguage;
import org.eclipse.cdt.ui.text.ICPartitions;
/**
* Helper class to match pairs of characters.
*/
public class CPairMatcher extends DefaultCharacterPairMatcher {
private static final int ANGLE_BRACKETS_SEARCH_BOUND = 200;
private boolean fMatchAngularBrackets= true;
private int fAnchor= -1;
public CPairMatcher(char[] pairs) {
super(pairs, ICPartitions.C_PARTITIONING);
}
/* @see ICharacterPairMatcher#match(IDocument, int) */
@Override
public IRegion match(IDocument document, int offset) {
try {
return performMatch(document, offset);
} catch (BadLocationException ble) {
return null;
}
}
/*
* @see org.eclipse.jface.text.source.DefaultCharacterPairMatcher#getAnchor()
*/
@Override
public int getAnchor() {
if (fAnchor < 0) {
return super.getAnchor();
}
return fAnchor;
}
/*
* Performs the actual work of matching for #match(IDocument, int).
*/
private IRegion performMatch(IDocument document, int offset) throws BadLocationException {
if (offset < 0 || document == null) return null;
final char prevChar= document.getChar(Math.max(offset - 1, 0));
if ((prevChar == '<' || prevChar == '>') && !fMatchAngularBrackets)
return null;
final IRegion region;
if (prevChar == '<') {
region= findClosingAngleBracket(document, offset - 1);
fAnchor= ICharacterPairMatcher.LEFT;
} else if (prevChar == '>') {
region= findOpeningAngleBracket(document, offset - 1);
fAnchor= ICharacterPairMatcher.RIGHT;
} else {
region= super.match(document, offset);
fAnchor= -1;
}
if (region != null) {
if (prevChar == '>') {
final int peer= region.getOffset();
if (isLessThanOperator(document, peer))
return null;
} else if (prevChar == '<') {
final int peer= region.getOffset() + region.getLength() - 1;
if (isGreaterThanOperator(document, peer))
return null;
}
}
return region;
}
/**
* Returns the region enclosing the matching angle brackets.
*
* @param document a document
* @param offset an offset within the document pointing after the closing angle bracket
* @return the matching region or {@link NullPointerException} if no match could be found
* @throws BadLocationException
*/
private IRegion findOpeningAngleBracket(IDocument document, int offset) throws BadLocationException {
if (offset < 0) return null;
final String contentType= TextUtilities.getContentType(document, ICPartitions.C_PARTITIONING, offset, false);
CHeuristicScanner scanner= new CHeuristicScanner(document, ICPartitions.C_PARTITIONING, contentType);
if (isTemplateParameterCloseBracket(offset, document, scanner)) {
int pos= scanner.findOpeningPeer(offset - 1, Math.max(0, offset - ANGLE_BRACKETS_SEARCH_BOUND), '<', '>');
if (pos != CHeuristicScanner.NOT_FOUND) {
return new Region(pos, offset - pos + 1);
}
}
return null;
}
/**
* Returns the region enclosing the matching angle brackets.
*
* @param document a document
* @param offset an offset within the document pointing after the opening angle bracket
* @return the matching region or {@link NullPointerException} if no match could be found
* @throws BadLocationException
*/
private IRegion findClosingAngleBracket(IDocument document, int offset) throws BadLocationException {
if (offset < 0) return null;
final String contentType= TextUtilities.getContentType(document, ICPartitions.C_PARTITIONING, offset, false);
CHeuristicScanner scanner= new CHeuristicScanner(document, ICPartitions.C_PARTITIONING, contentType);
if (isTemplateParameterOpenBracket(offset, document, scanner)) {
int pos= scanner.findClosingPeer(offset + 1, Math.min(document.getLength(), offset + ANGLE_BRACKETS_SEARCH_BOUND), '<', '>');
if (pos != CHeuristicScanner.NOT_FOUND) {
return new Region(offset, pos - offset + 1);
}
}
return null;
}
/**
* Returns true if the character at the specified offset is a
* less-than sign, rather than an template parameter list open
* angle bracket.
*
* @param document a document
* @param offset an offset within the document
* @return true if the character at the specified offset is not
* a template parameter start bracket
* @throws BadLocationException
*/
private boolean isLessThanOperator(IDocument document, int offset) throws BadLocationException {
if (offset < 0) return false;
final String contentType= TextUtilities.getContentType(document, ICPartitions.C_PARTITIONING, offset, false);
CHeuristicScanner scanner= new CHeuristicScanner(document, ICPartitions.C_PARTITIONING, contentType);
return !isTemplateParameterOpenBracket(offset, document, scanner);
}
/**
* Returns true if the character at the specified offset is a
* greater-than sign, rather than an template parameter list close
* angle bracket.
*
* @param document a document
* @param offset an offset within the document
* @return true if the character at the specified offset is not
* a template parameter end bracket
* @throws BadLocationException
*/
private boolean isGreaterThanOperator(IDocument document, int offset) throws BadLocationException {
if (offset < 0) return false;
final String contentType= TextUtilities.getContentType(document, ICPartitions.C_PARTITIONING, offset, false);
CHeuristicScanner scanner= new CHeuristicScanner(document, ICPartitions.C_PARTITIONING, contentType);
return !isTemplateParameterCloseBracket(offset, document, scanner);
}
/**
* Checks if the angular bracket at <code>offset</code> is a template
* parameter bracket.
*
* @param offset the offset of the opening bracket
* @param document the document
* @param scanner a heuristic scanner on <code>document</code>
* @return <code>true</code> if the bracket is part of a template parameter,
* <code>false</code> otherwise
*/
private boolean isTemplateParameterOpenBracket(int offset, IDocument document, CHeuristicScanner scanner) {
int prevToken= scanner.previousToken(offset - 1, Math.max(0, offset - ANGLE_BRACKETS_SEARCH_BOUND));
if (prevToken == Symbols.TokenIDENT || prevToken == Symbols.TokenTEMPLATE) {
return true;
}
return false;
}
/**
* Checks if the angular bracket at <code>offset</code> is a template
* parameter bracket.
*
* @param offset the offset of the closing bracket
* @param document the document
* @param scanner a heuristic scanner on <code>document</code>
* @return <code>true</code> if the bracket is part of a template parameter,
* <code>false</code> otherwise
*/
private boolean isTemplateParameterCloseBracket(int offset, IDocument document, CHeuristicScanner scanner) {
if (offset >= document.getLength() - 1)
return true;
int thisToken= scanner.previousToken(offset, Math.max(0, offset - ANGLE_BRACKETS_SEARCH_BOUND));
if (thisToken != Symbols.TokenGREATERTHAN)
return false;
int prevToken= scanner.previousToken(scanner.getPosition(), Math.max(0, offset - ANGLE_BRACKETS_SEARCH_BOUND));
if (prevToken == Symbols.TokenGREATERTHAN)
return true;
int nextToken= scanner.nextToken(offset + 1, Math.min(document.getLength(), offset + ANGLE_BRACKETS_SEARCH_BOUND));
switch (nextToken) {
case Symbols.TokenGREATERTHAN:
case Symbols.TokenCOMMA:
case Symbols.TokenSEMICOLON:
case Symbols.TokenCLASS:
case Symbols.TokenSTRUCT:
case Symbols.TokenUNION:
return true;
}
return false;
}
/**
* Configure this bracket matcher for the given language.
* @param language
*/
public void configure(ILanguage language) {
fMatchAngularBrackets= language != null && language.getLinkageID() == ILinkage.CPP_LINKAGE_ID;
}
}
|
