/interpreter/tags/at2dist170907/src/edu/vub/util/regexp/RETokenBackRef.java
http://ambienttalk.googlecode.com/ · Java · 84 lines · 38 code · 9 blank · 37 comment · 11 complexity · c6bca46c85cbff4d9587fcf4f1f3593c MD5 · raw file
- /* gnu/regexp/RETokenBackRef.java
- Copyright (C) 1998-2001, 2004 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 edu.vub.util.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) {
- if (num >= mymatch.start.length) return false;
- if (num >= mymatch.end.length) return false;
- 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++) {
- char c1 = input.charAt(mymatch.index+i-b);
- char c2 = input.charAt(i);
- if (c1 != c2) {
- if (insens) {
- if (c1 != Character.toLowerCase(c2) &&
- c1 != Character.toUpperCase(c2)) {
- return false;
- }
- }
- else {
- return false;
- }
- }
- }
- mymatch.index += e-b;
- return next(input, mymatch);
- }
-
- void dump(StringBuffer os) {
- os.append('\\').append(num);
- }
- }