source: trunk/yao/share/antlr-2.7.7/lib/cpp/antlr/CharInputBuffer.hpp @ 1

#ifndef INC_CharInputBuffer_hpp__
# define INC_CharInputBuffer_hpp__

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

# include <antlr/config.hpp>
# include <antlr/InputBuffer.hpp>

# ifdef HAS_NOT_CCTYPE_H
#       include <ctype.h>
# else
#       include <cctype>
# endif

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

/** CharInputBuffer.hpp provides an InputBuffer for plain character arrays (buffers).
 */
class CharInputBuffer : public InputBuffer
{
public:
        /** Construct a CharInputBuffer.hpp object with a char* buffer of 'size'
         * if 'owner' is true, then the buffer will be delete[]-ed on destruction.
         * @note it is assumed the buffer was allocated with new[]!
         */
        CharInputBuffer( unsigned char* buf, size_t size, bool owner = false )
        : buffer(buf)
        , ptr(buf)
        , end(buf + size)
        , delete_buffer(owner)
        {
        }

        /** Destructor
         * @note If you're using malloced data, then you probably need to change
         * this destructor. Or better use this class as template for your own.
         */
        ~CharInputBuffer( void )
        {
                if( delete_buffer && buffer )
                        delete [] buffer;
        }

        /** Reset the CharInputBuffer to initial state
         * Called from LexerInputState::reset.
         * @see LexerInputState
         */
        virtual inline void reset( void )
        {
                InputBuffer::reset();
                ptr = buffer;
        }

        virtual int getChar( void )
        {
                return (ptr < end) ? *ptr++ : EOF;
        }

protected:
        unsigned char* buffer;  ///< the buffer with data
        unsigned char* ptr;             ///< position ptr into the buffer
        unsigned char* end;             ///< end sentry for buffer
        bool delete_buffer;             ///< flag signifying if we have to delete the buffer
};

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif