/*============================================================================= | |
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 |