/jEdit/tags/jedit-4-0-pre5/gnu/regexp/RETokenLookAhead.java
Java | 68 lines | 38 code | 6 blank | 24 comment | 8 complexity | 71247d1b97362fab6a90113112fe9e14 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*
- * 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(')');
- }
- }