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

    Copyright (c) 2003 Joel de Guzman

    Copyright (c) 2003 Vaclav Vesely

    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)

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

#ifndef BOOST_SPIRIT_LAZY_HPP

#define BOOST_SPIRIT_LAZY_HPP



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

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

#include <boost/spirit/phoenix/actor.hpp>



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



namespace boost { namespace spirit

{

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

    //

    // lazy_parser, holds phoenix actor which returns a spirit parser.

    //

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



    template<class ActorT>

    struct lazy_parser : parser<lazy_parser<ActorT> >

    {

        typedef lazy_parser<ActorT> self_t;

        typedef typename phoenix::actor_result<

            ActorT, phoenix::tuple<> >::plain_type actor_result_t;



        template<typename ScannerT>

        struct result

        {

            typedef typename

                parser_result<actor_result_t, ScannerT>::type

            type;

        };



        lazy_parser(ActorT const& actor_)

        : actor(actor_) {}



        template<typename ScannerT>

        typename parser_result<self_t, ScannerT>::type

        parse(ScannerT const& scan) const

        { return actor().parse(scan); }



        ActorT actor;

    };



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

    // lazy_p, returns lazy_parser

    // Usage: lazy_p(actor)

    template<class ActorT>

    lazy_parser<ActorT> lazy_p(ActorT const& actor)

    { return lazy_parser<ActorT>(actor); }



}} // namespace boost::spirit



#endif // BOOST_SPIRIT_LAZY_HPP

