| /* gnu/regexp/RETokenBackRef.java |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.util.regex; |
| |
| import gnu.java.lang.CPStringBuilder; |
| |
| final class RETokenBackRef extends REToken |
| { |
| private int num; |
| private boolean insens; |
| |
| RETokenBackRef (int subIndex, int num, boolean insens) |
| { |
| super (subIndex); |
| this.num = num; |
| this.insens = insens; |
| } |
| |
| // should implement getMinimumLength() -- any ideas? |
| |
| REMatch matchThis (CharIndexed input, REMatch mymatch) |
| { |
| if (num >= mymatch.start.length) |
| return null; |
| if (num >= mymatch.end.length) |
| return null; |
| int b, e; |
| b = mymatch.start[num]; |
| e = mymatch.end[num]; |
| if ((b == -1) || (e == -1)) |
| return null; // this shouldn't happen, but... |
| if (b < 0) |
| b += 1; |
| if (e < 0) |
| e += 1; |
| for (int i = b; i < e; i++) |
| { |
| char c1 = input.charAt (mymatch.index + i - b); |
| char c2 = input.charAt (i); |
| if (c1 != c2) |
| { |
| if (insens) |
| { |
| if (c1 != toLowerCase (c2, unicodeAware) && |
| c1 != toUpperCase (c2, unicodeAware)) |
| { |
| return null; |
| } |
| } |
| else |
| { |
| return null; |
| } |
| } |
| } |
| mymatch.index += e - b; |
| return mymatch; |
| } |
| |
| void dump (CPStringBuilder os) |
| { |
| os.append ('\\').append (num); |
| } |
| } |