27a92d683b
2004-09-25 Shashank Bapat <shashankbapat@yahoo.com>
Mark Wielaard <mark@klomp.org>
* gnu/regexp/RE.java (initialize): Add RETokenLookAhead support.
* gnu/regexp/RETokenLookAhead.java: New file.
* Makefile.am (ordinary_java_source_files): Add RETokenLookAhead.java.
* Makefile.in: Regenerated.
Co-Authored-By: Mark Wielaard <mark@klomp.org>
From-SVN: r88106
88 lines
2.7 KiB
Java
88 lines
2.7 KiB
Java
/* gnu/regexp/RETokenLookAhead.java
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Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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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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