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
|
/*
* gnu/regexp/RETokenOneOf.java
* Copyright (C) 1998-2001 Wes Biggs
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package gnu.regexp;
/**
* @since gnu.regexp 1.1.3
* @author Shashank Bapat
*/
final class RETokenLookAhead extends REToken
{
REToken re;
boolean negative;
RETokenLookAhead(REToken re, boolean negative) throws REException {
super(0);
this.re = re;
this.negative = negative;
}
boolean match(CharIndexed input, REMatch mymatch)
{
REMatch trymatch = (REMatch)mymatch.clone();
REMatch trymatch1 = (REMatch)mymatch.clone();
REMatch newMatch = null;
if (re.match(input, trymatch)) {
if (negative) return false;
if (next(input, trymatch1))
newMatch = trymatch1;
}
if (newMatch != null) {
if (negative) return false;
//else
mymatch.assignFrom(newMatch);
return true;
}
else { // no match
if (negative)
return next(input, mymatch);
//else
return false;
}
}
void dump(StringBuffer os) {
os.append("(?");
os.append(negative ? '!' : '=');
re.dumpAll(os);
os.append(')');
}
}
|
