/*=============================================================================
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Copyright (c) 2003 Joel de Guzman
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Copyright (c) 2003 Vaclav Vesely
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http://spirit.sourceforge.net/
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef BOOST_SPIRIT_LAZY_HPP
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#define BOOST_SPIRIT_LAZY_HPP
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////////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/parser.hpp>
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#include <boost/spirit/home/classic/phoenix/actor.hpp>
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////////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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////////////////////////////////////////////////////////////////////////////
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//
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// lazy_parser, holds phoenix actor which returns a spirit parser.
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//
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////////////////////////////////////////////////////////////////////////////
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template<class ActorT>
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struct lazy_parser : parser<lazy_parser<ActorT> >
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{
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typedef lazy_parser<ActorT> self_t;
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typedef typename ::phoenix::actor_result<
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ActorT, ::phoenix::tuple<> >::plain_type actor_result_t;
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template<typename ScannerT>
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struct result
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{
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typedef typename
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parser_result<actor_result_t, ScannerT>::type
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type;
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};
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lazy_parser(ActorT const& actor_)
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: actor(actor_) {}
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template<typename ScannerT>
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typename parser_result<self_t, ScannerT>::type
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parse(ScannerT const& scan) const
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{ return actor().parse(scan); }
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ActorT actor;
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};
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//////////////////////////////
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// lazy_p, returns lazy_parser
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// Usage: lazy_p(actor)
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template<class ActorT>
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lazy_parser<ActorT> lazy_p(ActorT const& actor)
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{ return lazy_parser<ActorT>(actor); }
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif // BOOST_SPIRIT_LAZY_HPP
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