1 |
769 |
jeremybenn |
/* gnu/regexp/REFilterInputStream.java
|
2 |
|
|
Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
|
3 |
|
|
|
4 |
|
|
This file is part of GNU Classpath.
|
5 |
|
|
|
6 |
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
7 |
|
|
it under the terms of the GNU General Public License as published by
|
8 |
|
|
the Free Software Foundation; either version 2, or (at your option)
|
9 |
|
|
any later version.
|
10 |
|
|
|
11 |
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
12 |
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
|
|
General Public License for more details.
|
15 |
|
|
|
16 |
|
|
You should have received a copy of the GNU General Public License
|
17 |
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
18 |
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 |
|
|
02110-1301 USA.
|
20 |
|
|
|
21 |
|
|
Linking this library statically or dynamically with other modules is
|
22 |
|
|
making a combined work based on this library. Thus, the terms and
|
23 |
|
|
conditions of the GNU General Public License cover the whole
|
24 |
|
|
combination.
|
25 |
|
|
|
26 |
|
|
As a special exception, the copyright holders of this library give you
|
27 |
|
|
permission to link this library with independent modules to produce an
|
28 |
|
|
executable, regardless of the license terms of these independent
|
29 |
|
|
modules, and to copy and distribute the resulting executable under
|
30 |
|
|
terms of your choice, provided that you also meet, for each linked
|
31 |
|
|
independent module, the terms and conditions of the license of that
|
32 |
|
|
module. An independent module is a module which is not derived from
|
33 |
|
|
or based on this library. If you modify this library, you may extend
|
34 |
|
|
this exception to your version of the library, but you are not
|
35 |
|
|
obligated to do so. If you do not wish to do so, delete this
|
36 |
|
|
exception statement from your version. */
|
37 |
|
|
|
38 |
|
|
|
39 |
|
|
package gnu.java.util.regex;
|
40 |
|
|
import java.io.FilterInputStream;
|
41 |
|
|
import java.io.InputStream;
|
42 |
|
|
|
43 |
|
|
/**
|
44 |
|
|
* Replaces instances of a given RE found within an InputStream
|
45 |
|
|
* with replacement text. The replacements are interpolated into the
|
46 |
|
|
* stream when a match is found.
|
47 |
|
|
*
|
48 |
|
|
* @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
|
49 |
|
|
* @deprecated This class cannot properly handle all character
|
50 |
|
|
* encodings. For proper handling, use the REFilterReader
|
51 |
|
|
* class instead.
|
52 |
|
|
*/
|
53 |
|
|
|
54 |
|
|
public class REFilterInputStream extends FilterInputStream
|
55 |
|
|
{
|
56 |
|
|
|
57 |
|
|
private RE expr;
|
58 |
|
|
private String replace;
|
59 |
|
|
private String buffer;
|
60 |
|
|
private int bufpos;
|
61 |
|
|
private int offset;
|
62 |
|
|
private CharIndexedInputStream stream;
|
63 |
|
|
|
64 |
|
|
/**
|
65 |
|
|
* Creates an REFilterInputStream. When reading from this stream,
|
66 |
|
|
* occurrences of patterns matching the supplied regular expression
|
67 |
|
|
* will be replaced with the supplied replacement text (the
|
68 |
|
|
* metacharacters $0 through $9 may be used to refer to the full
|
69 |
|
|
* match or subexpression matches).
|
70 |
|
|
*
|
71 |
|
|
* @param stream The InputStream to be filtered.
|
72 |
|
|
* @param expr The regular expression to search for.
|
73 |
|
|
* @param replace The text pattern to replace matches with.
|
74 |
|
|
*/
|
75 |
|
|
public REFilterInputStream (InputStream stream, RE expr, String replace)
|
76 |
|
|
{
|
77 |
|
|
super (stream);
|
78 |
|
|
this.stream = new CharIndexedInputStream (stream, 0);
|
79 |
|
|
this.expr = expr;
|
80 |
|
|
this.replace = replace;
|
81 |
|
|
}
|
82 |
|
|
|
83 |
|
|
/**
|
84 |
|
|
* Reads the next byte from the stream per the general contract of
|
85 |
|
|
* InputStream.read(). Returns -1 on error or end of stream.
|
86 |
|
|
*/
|
87 |
|
|
public int read ()
|
88 |
|
|
{
|
89 |
|
|
// If we have buffered replace data, use it.
|
90 |
|
|
if ((buffer != null) && (bufpos < buffer.length ()))
|
91 |
|
|
{
|
92 |
|
|
return (int) buffer.charAt (bufpos++);
|
93 |
|
|
}
|
94 |
|
|
|
95 |
|
|
// check if input is at a valid position
|
96 |
|
|
if (!stream.isValid ())
|
97 |
|
|
return -1;
|
98 |
|
|
|
99 |
|
|
REMatch mymatch = new REMatch (expr.getNumSubs (), offset, 0);
|
100 |
|
|
if (expr.match (stream, mymatch))
|
101 |
|
|
{
|
102 |
|
|
mymatch.end[0] = mymatch.index;
|
103 |
|
|
mymatch.finish (stream);
|
104 |
|
|
stream.move (mymatch.toString ().length ());
|
105 |
|
|
offset += mymatch.toString ().length ();
|
106 |
|
|
buffer = mymatch.substituteInto (replace);
|
107 |
|
|
bufpos = 1;
|
108 |
|
|
|
109 |
|
|
// This is prone to infinite loops if replace string turns out empty.
|
110 |
|
|
if (buffer.length () > 0)
|
111 |
|
|
{
|
112 |
|
|
return buffer.charAt (0);
|
113 |
|
|
}
|
114 |
|
|
}
|
115 |
|
|
char ch = stream.charAt (0);
|
116 |
|
|
if (ch == CharIndexed.OUT_OF_BOUNDS)
|
117 |
|
|
return -1;
|
118 |
|
|
stream.move (1);
|
119 |
|
|
offset++;
|
120 |
|
|
return ch;
|
121 |
|
|
}
|
122 |
|
|
|
123 |
|
|
/**
|
124 |
|
|
* Returns false. REFilterInputStream does not support mark() and
|
125 |
|
|
* reset() methods.
|
126 |
|
|
*/
|
127 |
|
|
public boolean markSupported ()
|
128 |
|
|
{
|
129 |
|
|
return false;
|
130 |
|
|
}
|
131 |
|
|
|
132 |
|
|
/** Reads from the stream into the provided array. */
|
133 |
|
|
public int read (byte[]b, int off, int len)
|
134 |
|
|
{
|
135 |
|
|
int i;
|
136 |
|
|
int ok = 0;
|
137 |
|
|
while (len-- > 0)
|
138 |
|
|
{
|
139 |
|
|
i = read ();
|
140 |
|
|
if (i == -1)
|
141 |
|
|
return (ok == 0) ? -1 : ok;
|
142 |
|
|
b[off++] = (byte) i;
|
143 |
|
|
ok++;
|
144 |
|
|
}
|
145 |
|
|
return ok;
|
146 |
|
|
}
|
147 |
|
|
|
148 |
|
|
/** Reads from the stream into the provided array. */
|
149 |
|
|
public int read (byte[]b)
|
150 |
|
|
{
|
151 |
|
|
return read (b, 0, b.length);
|
152 |
|
|
}
|
153 |
|
|
}
|