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// file : cutl/compiler/code-stream.hxx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef CUTL_COMPILER_CODE_STREAM_HXX
#define CUTL_COMPILER_CODE_STREAM_HXX
#include <memory> // std::auto_ptr
#include <ostream>
#include <cutl/exception.hxx>
namespace cutl
{
namespace compiler
{
//
//
template <typename C>
class code_stream
{
public:
code_stream () {}
virtual
~code_stream ();
public:
virtual void
put (C) = 0;
// Unbuffer flushes internal formatting buffers (if any).
// Note that unbuffer is not exactly flushing since it can
// result in formatting errors and in general can not be
// called at arbitrary points. Natural use case would be
// to call unbuffer at the end of the stream when no more
// data is expected.
//
virtual void
unbuffer () = 0;
private:
code_stream (code_stream const&);
code_stream&
operator= (code_stream const&);
};
//
//
template <typename C>
class from_streambuf_adapter: public code_stream<C>
{
public:
typedef typename std::basic_streambuf<C>::traits_type traits_type;
typedef typename std::basic_streambuf<C>::int_type int_type;
class eof: exception {};
class sync: exception {};
public:
from_streambuf_adapter (std::basic_streambuf<C>& stream)
: stream_ (stream)
{
}
private:
from_streambuf_adapter (from_streambuf_adapter const&);
from_streambuf_adapter&
operator= (from_streambuf_adapter const&);
public:
virtual void
put (C c);
virtual void
unbuffer ();
private:
std::basic_streambuf<C>& stream_;
};
//
//
template <typename C>
class to_streambuf_adapter: public std::basic_streambuf<C>
{
public:
typedef typename std::basic_streambuf<C>::traits_type traits_type;
typedef typename std::basic_streambuf<C>::int_type int_type;
public:
to_streambuf_adapter (code_stream<C>& stream)
: stream_ (stream)
{
}
private:
to_streambuf_adapter (to_streambuf_adapter const&);
to_streambuf_adapter&
operator= (to_streambuf_adapter const&);
public:
virtual int_type
overflow (int_type i);
// Does nothing since calling unbuffer here would be dangerous.
// See the note in code_stream.
//
virtual int
sync ();
private:
code_stream<C>& stream_;
};
//
//
template <template <typename> class S, typename C>
class ostream_filter
{
public:
typedef S<C> stream_type;
ostream_filter (std::basic_ostream<C>& os);
~ostream_filter ();
stream_type&
stream ()
{
return stream_;
}
private:
ostream_filter (ostream_filter const&);
ostream_filter&
operator= (ostream_filter const&);
private:
std::basic_ostream<C>& os_;
std::basic_streambuf<C>* prev_;
from_streambuf_adapter<C> from_adapter_;
stream_type stream_;
to_streambuf_adapter<C> to_adapter_;
};
}
}
#include <cutl/compiler/code-stream.txx>
#endif // CUTL_COMPILER_CODE_STREAM_HXX
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