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/*=============================================================================
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/spirit/include/phoenix_core.hpp>
#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 Expr, typename State, typename Data, typename Domain>
struct make_terminal_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 make_terminal_impl::expr_param expr
, typename make_terminal_impl::state_param /*state*/
, typename make_terminal_impl::data_param data
) const
{
return typename make_terminal_impl::make_component_()(
detail::make_cons(proto::value(expr))
, data
);
}
};
template <typename Expr, typename State, typename Data, typename Domain>
struct make_terminal_impl<phoenix::actor<Expr>, State, Data, Domain>
: proto::transform_impl<phoenix::actor<Expr>, State, Data>
{
typedef phoenix::actor<Expr> 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 make_terminal_impl::expr_param expr
, typename make_terminal_impl::state_param /*state*/
, typename make_terminal_impl::data_param data
) const
{
return typename make_terminal_impl::make_component_()(
detail::make_cons(expr)
, data
);
}
};
template <typename Expr, typename State, typename Data, typename Domain>
struct make_terminal_impl<phoenix::actor<Expr> &, State, Data, Domain>
: make_terminal_impl<phoenix::actor<Expr>, State, Data, Domain>
{};
template <typename Expr, typename State, typename Data, typename Domain>
struct make_terminal_impl<phoenix::actor<Expr> const &, State, Data, Domain>
: make_terminal_impl<phoenix::actor<Expr>, State, Data, Domain>
{};
template <typename Domain>
struct make_terminal : proto::transform<make_terminal<Domain> >
{
template<typename Expr, typename State, typename Data>
struct impl : make_terminal_impl<Expr, State, Data, Domain> {};
};
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 mpl::eval_if_c<
phoenix::is_actor<
typename proto::result_of::child_c<Expr, 1>::type
>::type::value
, proto::result_of::child_c<Expr, 1>
, 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
{
return
(*this)(
expr
, state
, data
, typename phoenix::is_actor<
typename proto::result_of::child_c<Expr, 1>::type
>::type()
);
}
result_type operator()(
typename impl::expr_param expr
, typename impl::state_param state
, typename impl::data_param data
, mpl::false_
) 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);
}
result_type operator()(
typename impl::expr_param expr
, typename impl::state_param state
, typename impl::data_param data
, mpl::true_
) const
{
elements_type elements =
detail::make_cons(
Grammar()(
proto::child_c<0>(expr), state, data) // LHS
, detail::make_cons(
proto::child_c<1>(expr)) // RHS
);
return make_component_()(elements, data);
}
};
};
}}}
#endif
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