/* *  gnu/regexp/RETokenBackRef.java *  Copyright (C) 1998-2001 Wes Biggs * *  This library is free software; you can redistribute it and/or modify *  it under the terms of the GNU Lesser General Public License as published *  by the Free Software Foundation; either version 2.1 of the License, or *  (at your option) any later version. * *  This library 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 Lesser General Public License for more details. * *  You should have received a copy of the GNU Lesser General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */package gnu.regexp;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?    boolean match(CharIndexed input, REMatch mymatch) {	int b,e;	b = mymatch.start[num];	e = mymatch.end[num];	if ((b==-1)||(e==-1)) return false; // this shouldn't happen, but...	for (int i=b; i<e; i++) {	    if (input.charAt(mymatch.index+i-b) != input.charAt(i)) {		return false;	    }	}	mymatch.index += e-b;	return next(input, mymatch);    }        void dump(StringBuffer os) {	os.append('\\').append(num);    }}