/*============================================================================= | |
Copyright (c) 2001-2011 Joel de Guzman | |
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) | |
==============================================================================*/ | |
#if !defined(BOOST_SPIRIT_META_COMPILER_OCTOBER_16_2008_0347PM) | |
#define BOOST_SPIRIT_META_COMPILER_OCTOBER_16_2008_0347PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/support/meta_compiler.hpp> | |
#include <boost/spirit/home/qi/domain.hpp> | |
#include <boost/spirit/home/qi/parser.hpp> | |
#include <boost/spirit/home/support/string_traits.hpp> | |
#include <boost/type_traits/remove_reference.hpp> | |
#include <boost/utility/enable_if.hpp> | |
#include <boost/fusion/include/at.hpp> | |
namespace boost { namespace spirit | |
{ | |
template <typename T> | |
struct use_terminal<qi::domain, T | |
, typename enable_if<traits::is_parser<T> >::type> // enables parsers | |
: mpl::true_ {}; | |
namespace qi | |
{ | |
template <typename T, typename Modifiers, typename Enable = void> | |
struct make_primitive // by default, return it as-is | |
{ | |
typedef T result_type; | |
template <typename T_> | |
T_& operator()(T_& val, unused_type) const | |
{ | |
return val; | |
} | |
template <typename T_> | |
T_ const& operator()(T_ const& val, unused_type) const | |
{ | |
return val; | |
} | |
}; | |
template <typename Tag, typename Elements | |
, typename Modifiers, typename Enable = void> | |
struct make_composite; | |
template <typename Directive, typename Body | |
, typename Modifiers, typename Enable = void> | |
struct make_directive | |
{ | |
typedef Body result_type; | |
result_type operator()(unused_type, Body const& body, unused_type) const | |
{ | |
return body; // By default, a directive simply returns its subject | |
} | |
}; | |
} | |
// Qi primitive meta-compiler | |
template <> | |
struct make_component<qi::domain, proto::tag::terminal> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename qi::make_primitive< | |
typename remove_const<typename Elements::car_type>::type, | |
typename remove_reference<Modifiers>::type>::result_type | |
type; | |
}; | |
template <typename Elements, typename Modifiers> | |
typename result<make_component(Elements, Modifiers)>::type | |
operator()(Elements const& elements, Modifiers const& modifiers) const | |
{ | |
typedef typename remove_const<typename Elements::car_type>::type term; | |
return qi::make_primitive<term, Modifiers>()(elements.car, modifiers); | |
} | |
}; | |
// Qi composite meta-compiler | |
template <typename Tag> | |
struct make_component<qi::domain, Tag> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename | |
qi::make_composite<Tag, Elements, | |
typename remove_reference<Modifiers>::type>::result_type | |
type; | |
}; | |
template <typename Elements, typename Modifiers> | |
typename result<make_component(Elements, Modifiers)>::type | |
operator()(Elements const& elements, Modifiers const& modifiers) const | |
{ | |
return qi::make_composite<Tag, Elements, Modifiers>()( | |
elements, modifiers); | |
} | |
}; | |
// Qi function meta-compiler | |
template <> | |
struct make_component<qi::domain, proto::tag::function> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename | |
qi::make_composite< | |
typename remove_const<typename Elements::car_type>::type, | |
typename Elements::cdr_type, | |
typename remove_reference<Modifiers>::type | |
>::result_type | |
type; | |
}; | |
template <typename Elements, typename Modifiers> | |
typename result<make_component(Elements, Modifiers)>::type | |
operator()(Elements const& elements, Modifiers const& modifiers) const | |
{ | |
return qi::make_composite< | |
typename remove_const<typename Elements::car_type>::type, | |
typename Elements::cdr_type, | |
Modifiers>()(elements.cdr, modifiers); | |
} | |
}; | |
// Qi directive meta-compiler | |
template <> | |
struct make_component<qi::domain, tag::directive> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename | |
qi::make_directive< | |
typename remove_const<typename Elements::car_type>::type, | |
typename remove_const<typename Elements::cdr_type::car_type>::type, | |
typename remove_reference<Modifiers>::type | |
>::result_type | |
type; | |
}; | |
template <typename Elements, typename Modifiers> | |
typename result<make_component(Elements, Modifiers)>::type | |
operator()(Elements const& elements, Modifiers const& modifiers) const | |
{ | |
return qi::make_directive< | |
typename remove_const<typename Elements::car_type>::type, | |
typename remove_const<typename Elements::cdr_type::car_type>::type, | |
Modifiers>()(elements.car, elements.cdr.car, modifiers); | |
} | |
}; | |
}} | |
#endif |