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// file : CCF/CompilerElements/TokenStream.hpp
// author : Boris Kolpackov <boris@dre.vanderbilt.edu>
// cvs-id : $Id$
#ifndef CCF_COMPILER_ELEMENTS_TOKEN_STREAM_HPP
#define CCF_COMPILER_ELEMENTS_TOKEN_STREAM_HPP
#include <string>
#include <istream>
namespace CCF
{
namespace CompilerElements
{
template <typename Token>
class TokenStream
{
public:
// (JP 06-04-06) Not required by C++ spec, but it
// eliminates buggy GCC warnings.
virtual ~TokenStream () {}
virtual Token
next () = 0;
};
template <>
class TokenStream<char>
{
public:
typedef
std::char_traits<char>
traits;
typedef
traits::int_type
int_type;
typedef
traits::char_type
char_type;
public:
virtual int_type
next () = 0;
static char_type
to_char_type (int_type i)
{
return traits::to_char_type (i);
}
static int_type
eos ()
{
return traits::eof ();
}
};
class InputStreamAdapter : public TokenStream<char>
{
public:
InputStreamAdapter (std::istream& is)
: is_ (is)
{
}
public:
virtual int_type
next ()
{
return is_.get ();
}
private:
std::istream& is_;
};
}
}
#endif // CCF_COMPILER_ELEMENTS_TOKEN_STREAM_HPP
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