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// file : backend-elements/indentation/clip.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
#define BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
#include <backend-elements/types.hxx>
#include <backend-elements/indentation/buffer.hxx>
#include <ostream>
namespace BackendElements
{
namespace Indentation
{
template <typename C>
class ToStreambufAdapter: public std::basic_streambuf<C>,
public NonCopyable
{
public:
typedef
typename std::basic_streambuf<C>::traits_type
Traits;
typedef
typename std::basic_streambuf<C>::char_type
AsChar;
typedef
typename std::basic_streambuf<C>::int_type
AsInt;
public:
ToStreambufAdapter (Buffer<C>& buffer)
: buffer_ (buffer)
{
}
virtual AsInt
overflow (AsInt ch)
{
return buffer_.put (Traits::to_char_type (ch));
}
virtual Int
sync ()
{
return 0;
}
private:
Buffer<C>& buffer_;
};
template <typename C>
class FromStreambufAdapter: public Buffer<C>
{
public:
typedef
typename Buffer<C>::Traits
Traits;
typedef
typename Buffer<C>::AsChar
AsChar;
typedef
typename Buffer<C>::AsInt
AsInt;
typedef
typename Buffer<C>::Write
Write;
public:
FromStreambufAdapter (std::basic_streambuf<C>& b)
: buffer_ (b)
{
}
virtual AsInt
put (AsChar ch)
{
return buffer_.sputc (ch);
}
virtual Void
unbuffer ()
{
try
{
if (buffer_.pubsync () == 0) return;
}
catch (std::ios_base::failure const&)
{
}
throw Write ();
}
private:
std::basic_streambuf<C>& buffer_;
};
template <template <typename> class Buffer, typename C = Char>
class Clip: public NonCopyable
{
public:
Clip (std::basic_ostream<C>& os)
: os_ (os),
prev_ (os_.rdbuf ()),
from_adapter_ (*prev_),
buffer_ (from_adapter_),
to_adapter_ (buffer_)
{
os_.rdbuf (&to_adapter_);
}
/*
template <typename Arg0>
Clip (std::basic_ostream<C>& os, Arg0 a0)
: os_ (os),
prev_ (os_.rdbuf ()),
from_adapter_ (*prev_),
buffer_ (from_adapter_, a0),
to_adapter_ (buffer_)
{
os_.rdbuf (&to_adapter_);
}
*/
~Clip ()
{
try
{
buffer_.unbuffer ();
}
catch (...)
{
os_.rdbuf (prev_);
throw;
}
os_.rdbuf (prev_);
}
Buffer<C>&
buffer ()
{
return buffer_;
}
private:
std::basic_ostream<C>& os_;
std::basic_streambuf<C>* prev_;
FromStreambufAdapter<C> from_adapter_;
Buffer<C> buffer_;
ToStreambufAdapter<C> to_adapter_;
};
}
}
#include <backend-elements/indentation/clip.txx>
#endif // BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
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