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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/util/regex/REFilterInputStream.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/REFilterInputStream.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/REFilterInputStream.java | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/REFilterInputStream.java b/libjava/classpath/gnu/java/util/regex/REFilterInputStream.java new file mode 100644 index 000000000..c9fb346ba --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/REFilterInputStream.java @@ -0,0 +1,153 @@ +/* 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., 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 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); + } +} |