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

    Copyright (c) 2002-2003 Joel de Guzman

    Copyright (c) 2002-2003 Hartmut Kaiser

    http://spirit.sourceforge.net/



    Use, modification and distribution is subject to 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(BOOST_SPIRIT_AS_PARSER_HPP)

#define BOOST_SPIRIT_AS_PARSER_HPP



#include <boost/spirit/core/primitives/primitives.hpp>



namespace boost { namespace spirit {



    ///////////////////////////////////////////////////////////////////////////

    //

    //  Helper templates to derive the parser type from an auxilliary type

    //  and to generate an object of the required parser type given an

    //  auxilliary object. Supported types to convert are parsers,

    //  single characters and character strings.

    //

    ///////////////////////////////////////////////////////////////////////////

    namespace impl

    {

        template<typename T>

        struct default_as_parser

        {

            typedef T type;

            static type const& convert(type const& p)

            {

                return p;

            }

        };



        struct char_as_parser

        {

            typedef chlit<char> type;

            static type convert(char ch)

            {

                return type(ch);

            }

        };



        struct wchar_as_parser

        {

            typedef chlit<wchar_t> type;

            static type convert(wchar_t ch)

            {

                return type(ch);

            }

        };



        struct string_as_parser

        {

            typedef strlit<char const*> type;

            static type convert(char const* str)

            {

                return type(str);

            }

        };



        struct wstring_as_parser

        {

            typedef strlit<wchar_t const*> type;

            static type convert(wchar_t const* str)

            {

                return type(str);

            }

        };

    }



    template<typename T>

    struct as_parser : impl::default_as_parser<T> {};



    template<>

    struct as_parser<char> : impl::char_as_parser {};



    template<>

    struct as_parser<wchar_t> : impl::wchar_as_parser {};



    template<>

    struct as_parser<char*> : impl::string_as_parser {};



    template<>

    struct as_parser<char const*> : impl::string_as_parser {};



    template<>

    struct as_parser<wchar_t*> : impl::wstring_as_parser {};



    template<>

    struct as_parser<wchar_t const*> : impl::wstring_as_parser {};



    template<int N>

    struct as_parser<char[N]> : impl::string_as_parser {};



    template<int N>

    struct as_parser<wchar_t[N]> : impl::wstring_as_parser {};



    template<int N>

    struct as_parser<char const[N]> : impl::string_as_parser {};



    template<int N>

    struct as_parser<wchar_t const[N]> : impl::wstring_as_parser {};



}} // namespace boost::spirit



#endif

