/interpreter/tags/at2dist130208/src/edu/vub/util/regexp/RETokenStart.java
http://ambienttalk.googlecode.com/ · Java · 91 lines · 42 code · 10 blank · 39 comment · 13 complexity · 21e3ca1bc0e3b49b27ef9d6a890c210a MD5 · raw file
- /* gnu/regexp/RETokenStart.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;
- class RETokenStart extends REToken {
- private String newline; // matches after a newline
-
- RETokenStart(int subIndex, String newline) {
- super(subIndex);
- this.newline = newline;
- }
- int getMaximumLength() {
- return 0;
- }
-
- boolean match(CharIndexed input, REMatch mymatch) {
- // charAt(index-n) may be unknown on a Reader/InputStream. FIXME
- // Match after a newline if in multiline mode
-
- if (newline != null) {
- int len = newline.length();
- if (mymatch.offset >= len) {
- boolean found = true;
- char z;
- int i = 0; // position in REToken.newline
- char ch = input.charAt(mymatch.index - len);
- do {
- z = newline.charAt(i);
- if (ch != z) {
- found = false;
- break;
- }
- ++i;
- ch = input.charAt(mymatch.index - len + i);
- } while (i < len);
-
- if (found) return next(input, mymatch);
- }
- }
-
- // Don't match at all if REG_NOTBOL is set.
- if ((mymatch.eflags & RE.REG_NOTBOL) > 0) return false;
-
- if ((mymatch.eflags & RE.REG_ANCHORINDEX) > 0)
- return (mymatch.anchor == mymatch.offset) ?
- next(input, mymatch) : false;
- else
- return ((mymatch.index == 0) && (mymatch.offset == 0)) ?
- next(input, mymatch) : false;
- }
-
- void dump(StringBuffer os) {
- os.append('^');
- }
- }