/*=============================================================================

    Copyright (c) 1999-2003 Jaakko Järvi

    Copyright (c) 1999-2003 Jeremiah Willcock

    Copyright (c) 2001-2006 Joel de Guzman



    Distributed under the Boost Software License, Version 1.0. (See accompanying 

    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

==============================================================================*/

#if !defined(FUSION_IN_05052005_0121)

#define FUSION_IN_05052005_0121



#include <istream>

#include <boost/fusion/sequence/io/detail/manip.hpp>



#include <boost/mpl/bool.hpp>

#include <boost/fusion/sequence/intrinsic/begin.hpp>

#include <boost/fusion/sequence/intrinsic/end.hpp>

#include <boost/fusion/iterator/deref.hpp>

#include <boost/fusion/iterator/next.hpp>

#include <boost/fusion/iterator/equal_to.hpp>



namespace boost { namespace fusion { namespace detail

{

    template <typename Tag>

    struct delimiter_in

    {

        // read a delimiter

        template <typename IS>

        static void

        read(IS& is, char const* delim, mpl::false_ = mpl::false_())

        {

            detail::string_ios_manip<Tag, IS> manip(is);

            manip.read(delim);

        }



        template <typename IS>

        static void

        read(IS& is, char const* delim, mpl::true_)

        {

        }

    };



    struct read_sequence_loop

    {

        template <typename IS, typename First, typename Last>

        static void

        call(IS& is, First const&, Last const&, mpl::true_)

        {

        }



        template <typename IS, typename First, typename Last>

        static void

        call(IS& is, First const& first, Last const& last, mpl::false_)

        {

            result_of::equal_to<

                typename result_of::next<First>::type

              , Last

            >

            is_last;



            is >> *first;

            delimiter_in<tuple_delimiter_tag>::read(is, " ", is_last);

            call(is, fusion::next(first), last, is_last);

        }



        template <typename IS, typename First, typename Last>

        static void

        call(IS& is, First const& first, Last const& last)

        {

            result_of::equal_to<First, Last> eq;

            call(is, first, last, eq);

        }

    };



    template <typename IS, typename Sequence>

    inline void

    read_sequence(IS& is, Sequence& seq)

    {

        delimiter_in<tuple_open_tag>::read(is, "(");

        read_sequence_loop::call(is, fusion::begin(seq), fusion::end(seq));

        delimiter_in<tuple_close_tag>::read(is, ")");

    }

}}}



#endif

