TokenBuffer.hpp

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#ifndef INC_TokenBuffer_hpp__
#define INC_TokenBuffer_hpp__
 
/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/TokenBuffer.hpp#2 $
 */
 
#include <antlr/config.hpp>
#include <antlr/TokenStream.hpp>
#include <antlr/CircularQueue.hpp>
 
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

class ANTLR_API TokenBuffer {
public:
   TokenBuffer(TokenStream& input_);
   virtual ~TokenBuffer();

   inline void reset( void )
   {
      nMarkers = 0;
      markerOffset = 0;
      numToConsume = 0;
      queue.clear();
   }

   int LA( unsigned int i );

   RefToken LT( unsigned int i );

   unsigned int mark();

   void rewind(unsigned int mark);

   inline void consume()
   {
      numToConsume++;
   }

   virtual unsigned int entries() const;
 
private:
   void fill(unsigned int amount);
   void syncConsume();
 
protected:
   TokenStream& input;

   unsigned int nMarkers;

   unsigned int markerOffset;

   unsigned int numToConsume;

   CircularQueue<RefToken> queue;
 
private:
   TokenBuffer(const TokenBuffer& other);
   const TokenBuffer& operator=(const TokenBuffer& other);
};

inline void TokenBuffer::syncConsume()
{
   if (numToConsume > 0)
   {
      if (nMarkers > 0)
         markerOffset += numToConsume;
      else
         queue.removeItems( numToConsume );
 
      numToConsume = 0;
   }
}
 
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
 
#endif //INC_TokenBuffer_hpp__