107 lines
3.7 KiB
C++
Executable File
107 lines
3.7 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2001-2007 Joel de Guzman
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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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#if !defined(BOOST_SPIRIT_LAZY_MARCH_27_2007_1002AM)
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#define BOOST_SPIRIT_LAZY_MARCH_27_2007_1002AM
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/qi/skip.hpp>
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#include <boost/spirit/home/support/attribute_of.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/fusion/include/at.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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namespace boost { namespace spirit { namespace qi
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{
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struct lazy_parser
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{
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template <typename Component, typename Context, typename Iterator>
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struct attribute
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{
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typedef typename
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result_of::subject<Component>::type
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subject_type;
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typedef typename
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remove_reference<
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typename boost::result_of<subject_type(unused_type, Context)>::type
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>::type
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expr_type;
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typedef typename
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result_of::as_component<qi::domain, expr_type>::type
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component_type;
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typedef typename
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traits::attribute_of<
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qi::domain, component_type, Context, Iterator>::type
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type;
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};
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template <
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typename Component
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, typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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static bool parse(
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Component const& component
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, Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper
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, Attribute& attr)
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{
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typedef typename
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result_of::subject<Component>::type
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subject_type;
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typedef typename
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remove_reference<
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typename boost::result_of<subject_type(unused_type, Context)>::type
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>::type
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expr_type;
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typedef typename
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result_of::as_component<qi::domain, expr_type>::type
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component_type;
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component_type subject
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= spirit::as_component(
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qi::domain(), fusion::at_c<0>(component.elements)(unused, context));
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return component_type::director::
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parse(subject, first, last, context, skipper, attr);
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}
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template <typename Component, typename Context>
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static std::string what(Component const& component, Context const& ctx)
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{
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//~ typedef typename
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//~ result_of::subject<Component>::type
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//~ subject_type;
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//~ typedef typename
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//~ remove_reference<
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//~ typename boost::result_of<subject_type(unused_type, unused_type)>::type
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//~ >::type
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//~ expr_type;
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//~ typedef typename
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//~ result_of::as_component<qi::domain, expr_type>::type
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//~ component_type;
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//~ component_type subject
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//~ = spirit::as_component(
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//~ qi::domain(), fusion::at_c<0>(component.elements)(unused, unused));
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std::string result = "lazy[";
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//~ result += component_type::director::what(subject, ctx);
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result += "]";
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return result;
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}
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};
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}}}
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#endif
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