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-/* gnu/regexp/REFilterInputStream.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., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 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.regexp;
-import java.io.FilterInputStream;
-import java.io.InputStream;
-
-/**
- * Replaces instances of a given RE found within an InputStream
- * with replacement text. The replacements are interpolated into the
- * stream when a match is found.
- *
- * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
- * @deprecated This class cannot properly handle all character
- * encodings. For proper handling, use the REFilterReader
- * class instead.
- */
-
-public class REFilterInputStream extends FilterInputStream {
-
- private RE expr;
- private String replace;
- private String buffer;
- private int bufpos;
- private int offset;
- private CharIndexedInputStream stream;
-
- /**
- * Creates an REFilterInputStream. When reading from this stream,
- * occurrences of patterns matching the supplied regular expression
- * will be replaced with the supplied replacement text (the
- * metacharacters $0 through $9 may be used to refer to the full
- * match or subexpression matches).
- *
- * @param stream The InputStream to be filtered.
- * @param expr The regular expression to search for.
- * @param replace The text pattern to replace matches with.
- */
- public REFilterInputStream(InputStream stream, RE expr, String replace) {
- super(stream);
- this.stream = new CharIndexedInputStream(stream,0);
- this.expr = expr;
- this.replace = replace;
- }
-
- /**
- * Reads the next byte from the stream per the general contract of
- * InputStream.read(). Returns -1 on error or end of stream.
- */
- public int read() {
- // If we have buffered replace data, use it.
- if ((buffer != null) && (bufpos < buffer.length())) {
- return (int) buffer.charAt(bufpos++);
- }
-
- // check if input is at a valid position
- if (!stream.isValid()) return -1;
-
- REMatch mymatch = new REMatch(expr.getNumSubs(),offset,0);
- if (expr.match(stream, mymatch)) {
- mymatch.end[0] = mymatch.index;
- mymatch.finish(stream);
- stream.move(mymatch.toString().length());
- offset += mymatch.toString().length();
- buffer = mymatch.substituteInto(replace);
- bufpos = 1;
-
- // This is prone to infinite loops if replace string turns out empty.
- if (buffer.length() > 0) {
- return buffer.charAt(0);
- }
- }
- char ch = stream.charAt(0);
- if (ch == CharIndexed.OUT_OF_BOUNDS) return -1;
- stream.move(1);
- offset++;
- return ch;
- }
-
- /**
- * Returns false. REFilterInputStream does not support mark() and
- * reset() methods.
- */
- public boolean markSupported() {
- return false;
- }
-
- /** Reads from the stream into the provided array. */
- public int read(byte[] b, int off, int len) {
- int i;
- int ok = 0;
- while (len-- > 0) {
- i = read();
- if (i == -1) return (ok == 0) ? -1 : ok;
- b[off++] = (byte) i;
- ok++;
- }
- return ok;
- }
-
- /** Reads from the stream into the provided array. */
- public int read(byte[] b) {
- return read(b,0,b.length);
- }
-}