1 files changed, 154 insertions, 0 deletions
diff --git a/libcutl/cutl/compiler/code-stream.hxx b/libcutl/cutl/compiler/code-stream.hxx
new file mode 100644
index 0000000..bfd33d0
--- /dev/null
+++ b/libcutl/cutl/compiler/code-stream.hxx
@@ -0,0 +1,154 @@
+// 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