mirror of git://gcc.gnu.org/git/gcc.git
137 lines
3.8 KiB
Java
137 lines
3.8 KiB
Java
/* gnu/regexp/RETokenLookBehind.java
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Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.java.util.regex;
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import gnu.java.lang.CPStringBuilder;
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/**
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* @author Ito Kazumitsu
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*/
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final class RETokenLookBehind extends REToken
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{
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REToken re;
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boolean negative;
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RETokenLookBehind (REToken re, boolean negative) throws REException
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{
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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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int getMaximumLength ()
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{
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return 0;
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}
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REMatch matchThis (CharIndexed input, REMatch mymatch)
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{
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int max = re.getMaximumLength ();
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CharIndexed behind = input.lookBehind (mymatch.index, max);
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REMatch trymatch = (REMatch) mymatch.clone ();
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int diff = behind.length () - input.length ();
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int curIndex = trymatch.index + diff;
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trymatch.index = 0;
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trymatch.offset = 0;
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RETokenMatchHereOnly stopper = new RETokenMatchHereOnly (curIndex);
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REToken re1 = (REToken) re.clone ();
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re1.chain (stopper);
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if (re1.match (behind, trymatch))
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{
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if (negative)
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return null;
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for (int i = 0; i < trymatch.start.length; i++)
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{
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if (trymatch.start[i] != -1 && trymatch.end[i] != -1)
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{
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trymatch.start[i] -= diff;
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if (trymatch.start[i] < 0)
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trymatch.start[i] -= 1;
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trymatch.end[i] -= diff;
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if (trymatch.end[i] < 0)
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trymatch.end[i] -= 1;
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}
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}
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trymatch.index = mymatch.index;
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trymatch.offset = mymatch.offset;
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return trymatch;
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}
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else
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{
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if (negative)
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return mymatch;
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return null;
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}
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}
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void dump (CPStringBuilder os)
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{
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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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private static class RETokenMatchHereOnly extends REToken
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{
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int getMaximumLength ()
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{
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return 0;
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}
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private int index;
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RETokenMatchHereOnly (int index)
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{
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super (0);
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this.index = index;
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}
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REMatch matchThis (CharIndexed input, REMatch mymatch)
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{
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return (index == mymatch.index ? mymatch : null);
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}
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void dump (CPStringBuilder os)
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{
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}
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}
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}
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