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// file : frontend-elements/token-stream.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef FRONTEND_ELEMENTS_TOKEN_STREAM_HXX
#define FRONTEND_ELEMENTS_TOKEN_STREAM_HXX
#include <frontend-elements/types.hxx>
#include <string> // std::char_traits
#include <istream>
namespace FrontendElements
{
//
//
template <typename Token>
class TokenStream
{
public:
virtual
~TokenStream ()
{
}
public:
virtual Token
next () = 0;
};
//
//
template <>
class TokenStream<Char>
{
public:
typedef
std::char_traits<FrontendElements::Char>
Traits;
typedef
Traits::int_type
AsInt;
typedef
Traits::char_type
AsChar;
public:
virtual
~TokenStream ()
{
}
public:
virtual AsInt
next () = 0;
static AsChar
to_char (AsInt i)
{
return Traits::to_char_type (i);
}
static AsInt
eos ()
{
return Traits::eof ();
}
};
class InputStreamAdapter: public TokenStream<Char>
{
public:
virtual
~InputStreamAdapter ()
{
}
InputStreamAdapter (std::istream& is)
: is_ (is)
{
}
public:
virtual AsInt
next ()
{
return is_.get ();
}
private:
std::istream& is_;
};
}
#endif // FRONTEND_ELEMENTS_TOKEN_STREAM_HXX
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