mirror of git://gcc.gnu.org/git/gcc.git
101 lines
3.1 KiB
Java
101 lines
3.1 KiB
Java
/* gnu/regexp/RETokenBackRef.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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final class RETokenBackRef extends REToken
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{
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private int num;
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private boolean insens;
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RETokenBackRef (int subIndex, int num, boolean insens)
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{
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super (subIndex);
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this.num = num;
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this.insens = insens;
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}
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// should implement getMinimumLength() -- any ideas?
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REMatch matchThis (CharIndexed input, REMatch mymatch)
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{
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if (num >= mymatch.start.length)
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return null;
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if (num >= mymatch.end.length)
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return null;
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int b, e;
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b = mymatch.start[num];
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e = mymatch.end[num];
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if ((b == -1) || (e == -1))
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return null; // this shouldn't happen, but...
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if (b < 0)
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b += 1;
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if (e < 0)
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e += 1;
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for (int i = b; i < e; i++)
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{
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char c1 = input.charAt (mymatch.index + i - b);
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char c2 = input.charAt (i);
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if (c1 != c2)
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{
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if (insens)
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{
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if (c1 != toLowerCase (c2, unicodeAware) &&
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c1 != toUpperCase (c2, unicodeAware))
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{
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return null;
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}
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}
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else
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{
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return null;
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}
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}
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}
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mymatch.index += e - b;
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return mymatch;
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}
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void dump (CPStringBuilder os)
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{
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os.append ('\\').append (num);
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}
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}
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