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+// file : cutl/compiler/code-stream.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 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>
+
+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;
+
+ struct eof {};
+ struct sync {};
+
+ 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