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- /*=============================================================================
- Copyright (c) 2003 Joel de Guzman
- Copyright (c) 2003 Vaclav Vesely
- http://spirit.sourceforge.net/
- 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)
- =============================================================================*/
- #ifndef BOOST_SPIRIT_LAZY_HPP
- #define BOOST_SPIRIT_LAZY_HPP
- ////////////////////////////////////////////////////////////////////////////////
- #include <boost/spirit/home/classic/namespace.hpp>
- #include <boost/spirit/home/classic/core/parser.hpp>
- #include <boost/spirit/home/classic/phoenix/actor.hpp>
- ////////////////////////////////////////////////////////////////////////////////
- namespace boost { namespace spirit {
- BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
- ////////////////////////////////////////////////////////////////////////////
- //
- // 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); }
- BOOST_SPIRIT_CLASSIC_NAMESPACE_END
- }} // namespace BOOST_SPIRIT_CLASSIC_NS
- #endif // BOOST_SPIRIT_LAZY_HPP
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