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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 {
     35     using TextReader = System.IO.TextReader;
     36 
     37     /** <summary>
     38      *  Vacuum all input from a Reader and then treat it like a StringStream.
     39      *  Manage the buffer manually to avoid unnecessary data copying.
     40      *  </summary>
     41      *
     42      *  <remarks>
     43      *  If you need encoding, use ANTLRInputStream.
     44      *  </remarks>
     45      */
     46     [System.Serializable]
     47     public class ANTLRReaderStream : ANTLRStringStream
     48     {
     49         public const int ReadBufferSize = 1024;
     50         public const int InitialBufferSize = 1024;
     51 
     52         public ANTLRReaderStream( TextReader r )
     53             : this( r, InitialBufferSize, ReadBufferSize )
     54         {
     55         }
     56 
     57         public ANTLRReaderStream( TextReader r, int size )
     58             : this( r, size, ReadBufferSize )
     59         {
     60         }
     61 
     62         public ANTLRReaderStream( TextReader r, int size, int readChunkSize )
     63         {
     64             Load( r, size, readChunkSize );
     65         }
     66 
     67         public virtual void Load( TextReader r, int size, int readChunkSize )
     68         {
     69             if ( r == null )
     70             {
     71                 return;
     72             }
     73             if ( size <= 0 )
     74             {
     75                 size = InitialBufferSize;
     76             }
     77             if ( readChunkSize <= 0 )
     78             {
     79                 readChunkSize = ReadBufferSize;
     80             }
     81             // System.out.println("load "+size+" in chunks of "+readChunkSize);
     82             try
     83             {
     84                 data = r.ReadToEnd().ToCharArray();
     85                 base.n = data.Length;
     86             }
     87             finally
     88             {
     89                 r.Close();
     90             }
     91         }
     92     }
     93 }
     94