| /*============================================================================= | |
| Copyright (c) 2001-2011 Joel de Guzman | |
| 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_MAKE_COMPONENT_OCTOBER_16_2008_1250PM | |
| #define BOOST_SPIRIT_MAKE_COMPONENT_OCTOBER_16_2008_1250PM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/proto/proto.hpp> | |
| #include <boost/spirit/home/support/detail/make_cons.hpp> | |
| #include <boost/spirit/home/support/modify.hpp> | |
| namespace boost { namespace spirit | |
| { | |
| // There is no real "component" class. Each domain is responsible | |
| // for creating its own components. You need to specialize this for | |
| // each component in your domain. Use this as a guide. | |
| template <typename Domain, typename Tag, typename Enable = void> | |
| struct make_component | |
| { | |
| template <typename Sig> | |
| struct result; | |
| template <typename This, typename Elements, typename Modifiers> | |
| struct result<This(Elements, Modifiers)>; | |
| template <typename Elements, typename Modifiers> | |
| typename result<make_component(Elements, Modifiers)>::type | |
| operator()(Elements const& elements, Modifiers const& modifiers) const; | |
| }; | |
| namespace tag | |
| { | |
| // Normally, we use proto tags as-is to distinguish operators. | |
| // The special case is proto::tag::subscript. Spirit uses this | |
| // as either sementic actions or directives. To distinguish between | |
| // the two, we use these special tags below. | |
| struct directive; | |
| struct action; | |
| } | |
| template <typename Domain, typename T, typename Enable = void> | |
| struct flatten_tree; | |
| }} | |
| namespace boost { namespace spirit { namespace detail | |
| { | |
| template <typename Domain> | |
| struct make_terminal : proto::transform<make_terminal<Domain> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename | |
| proto::result_of::value<Expr>::type | |
| value; | |
| typedef typename result_of::make_cons<value>::type elements; | |
| typedef | |
| make_component<Domain, proto::tag::terminal> | |
| make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param /*state*/ | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| return typename impl::make_component_()( | |
| detail::make_cons(proto::value(expr)) | |
| , data | |
| ); | |
| } | |
| }; | |
| }; | |
| template <typename Domain, typename Tag, typename Grammar> | |
| struct make_unary : proto::transform<make_unary<Domain, Tag, Grammar> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename | |
| proto::result_of::child_c<Expr, 0>::type | |
| child; | |
| typedef typename Grammar:: | |
| template result<Grammar(child, State, Data)>::type | |
| child_component; | |
| typedef typename | |
| result_of::make_cons<child_component>::type | |
| elements; | |
| typedef make_component<Domain, Tag> make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| return typename impl::make_component_()( | |
| detail::make_cons( | |
| Grammar()(proto::child(expr), state, data)) | |
| , data | |
| ); | |
| } | |
| }; | |
| }; | |
| // un-flattened version | |
| template <typename Domain, typename Tag, typename Grammar, | |
| bool flatten = flatten_tree<Domain, Tag>::value> | |
| struct make_binary | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename Grammar:: | |
| template result<Grammar( | |
| typename proto::result_of::child_c<Expr, 0>::type | |
| , State, Data)>::type | |
| lhs_component; | |
| typedef typename Grammar:: | |
| template result<Grammar( | |
| typename proto::result_of::child_c<Expr, 1>::type | |
| , State, Data)>::type | |
| rhs_component; | |
| typedef typename | |
| result_of::make_cons< | |
| lhs_component | |
| , typename result_of::make_cons<rhs_component>::type | |
| >::type | |
| elements_type; | |
| typedef make_component<Domain, Tag> make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements_type, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| elements_type elements = | |
| detail::make_cons( | |
| Grammar()( | |
| proto::child_c<0>(expr), state, data) // LHS | |
| , detail::make_cons( | |
| Grammar()( | |
| proto::child_c<1>(expr), state, data) // RHS | |
| ) | |
| ); | |
| return make_component_()(elements, data); | |
| } | |
| }; | |
| }; | |
| template <typename Grammar> | |
| struct make_binary_helper : proto::transform<make_binary_helper<Grammar> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename Grammar:: | |
| template result<Grammar(Expr, State, Data)>::type | |
| lhs; | |
| typedef typename result_of::make_cons<lhs, State>::type result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| return detail::make_cons(Grammar()(expr, state, data), state); | |
| } | |
| }; | |
| }; | |
| // Flattened version | |
| template <typename Domain, typename Tag, typename Grammar> | |
| struct make_binary<Domain, Tag, Grammar, true> | |
| : proto::transform<make_binary<Domain, Tag, Grammar> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename | |
| proto::reverse_fold_tree< | |
| proto::_ | |
| , proto::make<fusion::nil> | |
| , make_binary_helper<Grammar> | |
| >::template impl<Expr, State, Data> | |
| reverse_fold_tree; | |
| typedef typename reverse_fold_tree::result_type elements; | |
| typedef make_component<Domain, Tag> make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| return make_component_()( | |
| reverse_fold_tree()(expr, state, data), data); | |
| } | |
| }; | |
| }; | |
| template <typename Domain, typename Grammar> | |
| struct make_directive : proto::transform<make_directive<Domain, Grammar> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename | |
| proto::result_of::child_c<Expr, 0>::type | |
| lhs; | |
| typedef typename | |
| proto::result_of::value<lhs>::type | |
| tag_type; | |
| typedef typename modify<Domain>:: | |
| template result<modify<Domain>(tag_type, Data)>::type | |
| modifier_type; | |
| typedef typename Grammar:: | |
| template result<Grammar( | |
| typename proto::result_of::child_c<Expr, 1>::type | |
| , State | |
| , modifier_type | |
| )>::type | |
| rhs_component; | |
| typedef typename | |
| result_of::make_cons< | |
| tag_type | |
| , typename result_of::make_cons<rhs_component>::type | |
| >::type | |
| elements_type; | |
| typedef make_component<Domain, tag::directive> make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements_type, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| tag_type tag = proto::value(proto::child_c<0>(expr)); | |
| typename remove_reference<modifier_type>::type | |
| modifier = modify<Domain>()(tag, data); | |
| elements_type elements = | |
| detail::make_cons( | |
| tag // LHS | |
| , detail::make_cons( | |
| Grammar()( | |
| proto::child_c<1>(expr) // RHS | |
| , state, modifier) | |
| ) | |
| ); | |
| return make_component_()(elements, data); | |
| } | |
| }; | |
| }; | |
| template <typename Domain, typename Grammar> | |
| struct make_action : proto::transform<make_action<Domain, Grammar> > | |
| { | |
| template<typename Expr, typename State, typename Data> | |
| struct impl : proto::transform_impl<Expr, State, Data> | |
| { | |
| typedef typename Grammar:: | |
| template result<Grammar( | |
| typename proto::result_of::child_c<Expr, 0>::type | |
| , State | |
| , Data | |
| )>::type | |
| lhs_component; | |
| typedef typename | |
| proto::result_of::value< | |
| typename proto::result_of::child_c<Expr, 1>::type | |
| >::type | |
| rhs_component; | |
| typedef typename | |
| result_of::make_cons< | |
| lhs_component | |
| , typename result_of::make_cons<rhs_component>::type | |
| >::type | |
| elements_type; | |
| typedef make_component<Domain, tag::action> make_component_; | |
| typedef typename | |
| make_component_::template | |
| result<make_component_(elements_type, Data)>::type | |
| result_type; | |
| result_type operator()( | |
| typename impl::expr_param expr | |
| , typename impl::state_param state | |
| , typename impl::data_param data | |
| ) const | |
| { | |
| elements_type elements = | |
| detail::make_cons( | |
| Grammar()( | |
| proto::child_c<0>(expr), state, data) // LHS | |
| , detail::make_cons( | |
| proto::value(proto::child_c<1>(expr))) // RHS | |
| ); | |
| return make_component_()(elements, data); | |
| } | |
| }; | |
| }; | |
| }}} | |
| #endif |