ByteBuffer.cs :  » Inversion-of-Control-Dependency-Injection » Spring.net » Spring » Expressions » Parser » antlr » C# / CSharp Open Source

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C# / CSharp Open Source » Inversion of Control Dependency Injection » Spring.net 
Spring.net » Spring » Expressions » Parser » antlr » ByteBuffer.cs
using System;
using System.Runtime.InteropServices;
using StreamSystem.IO.Stream;
using BinaryReaderSystem.IO.BinaryReader;
using IOExceptionSystem.IO.IOException;

namespace Spring.Expressions.Parser.antlr{
  /*ANTLR Translator Generator
  * Project led by Terence Parr at http://www.jGuru.com
  * Software rights: http://www.antlr.org/license.html
  *
  * $Id:$
  */

  //
  // ANTLR C# Code Generator by Micheal Jordan
  //                            Kunle Odutola       : kunle UNDERSCORE odutola AT hotmail DOT com
  //                            Anthony Oguntimehin
  //
  // With many thanks to Eric V. Smith from the ANTLR list.
  //

  /*A Stream of characters fed to the lexer from a InputStream that can
  * be rewound via mark()/rewind() methods.
  * <p>
  * A dynamic array is used to buffer up all the input characters.  Normally,
  * "k" characters are stored in the buffer.  More characters may be stored during
  * guess mode (testing syntactic predicate), or when LT(i>k) is referenced.
  * Consumption of characters is deferred.  In other words, reading the next
  * character is not done by conume(), but deferred until needed by LA or LT.
  * <p>
  */

  // SAS: added this class to handle Binary input w/ FileInputStream
  
  public class ByteBuffer:InputBuffer
  {
    
    // char source
    [NonSerialized()]
    internal Stream input;
    
    private const int BUF_SIZE = 16;
    /// <summary>
    /// Small buffer used to avoid reading individual chars
    /// </summary>
    private byte[] buf = new byte[BUF_SIZE];

    
    /*Create a character buffer */
    public ByteBuffer(Stream input_) : base()
    {
      input = input_;
    }
    
    /*Ensure that the character buffer is sufficiently full */
    override public void  fill(int amount)
    {
//      try
//      {
      syncConsume();
      // Fill the buffer sufficiently to hold needed characters
      int bytesToRead = (amount + markerOffset) - queue.Count;
      int c;

      while (bytesToRead > 0)
      {
        // Read a few characters
        c = input.Read(buf, 0, BUF_SIZE);
        for (int i = 0; i < c; i++)
        {
          // Append the next character
          queue.Add(unchecked((char) buf[i]));
        }
        if (c < BUF_SIZE)
        {
          while ((bytesToRead-- > 0) && (queue.Count < BUF_SIZE))
          {
            queue.Add(CharScanner.EOF_CHAR);
          }
          break;
        }
        bytesToRead -= c;
      }
      //      }
//      catch (IOException io)
//      {
//        throw new CharStreamIOException(io);
//      }
    }
  }
}
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