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