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      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 
     33 namespace 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