ANTLRReaderStream.cs revision 324c4644fee44b9898524c09511bd33c3f12e2df 
1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2005-2008 Terence Parr
4 * All rights reserved.
5 *
6 * Conversion to C#:
7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33namespace Antlr.Runtime {
34    using TextReader = System.IO.TextReader;
35
36    /** <summary>
37     *  Vacuum all input from a Reader and then treat it like a StringStream.
38     *  Manage the buffer manually to avoid unnecessary data copying.
39     *  </summary>
40     *
41     *  <remarks>
42     *  If you need encoding, use ANTLRInputStream.
43     *  </remarks>
44     */
45    [System.Serializable]
46    public class ANTLRReaderStream : ANTLRStringStream {
47        public const int ReadBufferSize = 1024;
48        public const int InitialBufferSize = 1024;
49
50        public ANTLRReaderStream(TextReader r)
51            : this(r, InitialBufferSize, ReadBufferSize) {
52        }
53
54        public ANTLRReaderStream(TextReader r, int size)
55            : this(r, size, ReadBufferSize) {
56        }
57
58        public ANTLRReaderStream(TextReader r, int size, int readChunkSize) {
59            Load(r, size, readChunkSize);
60        }
61
62        public virtual void Load(TextReader r, int size, int readChunkSize) {
63            if (r == null) {
64                return;
65            }
66            if (size <= 0) {
67                size = InitialBufferSize;
68            }
69            if (readChunkSize <= 0) {
70                readChunkSize = ReadBufferSize;
71            }
72            // System.out.println("load "+size+" in chunks of "+readChunkSize);
73            try {
74                data = r.ReadToEnd().ToCharArray();
75                base.n = data.Length;
76            } finally {
77                r.Close();
78            }
79        }
80    }
81}
82