// Copyright (c) 2001-2011 Hartmut Kaiser | |
// 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_LEX_META_COMPILER_APR_20_2009_0756PM) | |
#define BOOST_SPIRIT_LEX_META_COMPILER_APR_20_2009_0756PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/support/meta_compiler.hpp> | |
#include <boost/spirit/home/lex/domain.hpp> | |
#include <boost/spirit/home/lex/lexer_type.hpp> | |
#include <boost/type_traits/remove_reference.hpp> | |
#include <boost/utility/enable_if.hpp> | |
namespace boost { namespace spirit | |
{ | |
template <typename T> | |
struct use_terminal<lex::domain, T | |
, typename enable_if<traits::is_lexer<T> >::type> // enables lexers | |
: mpl::true_ {}; | |
namespace lex | |
{ | |
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; | |
} | |
// Lex primitive meta-compiler | |
template <> | |
struct make_component<lex::domain, proto::tag::terminal> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename lex::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 lex::make_primitive<term, Modifiers>()(elements.car, modifiers); | |
} | |
}; | |
// Lex composite meta-compiler | |
template <typename Tag> | |
struct make_component<lex::domain, Tag> | |
{ | |
template <typename Sig> | |
struct result; | |
template <typename This, typename Elements, typename Modifiers> | |
struct result<This(Elements, Modifiers)> | |
{ | |
typedef typename | |
lex::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 lex::make_composite<Tag, Elements, Modifiers>()( | |
elements, modifiers); | |
} | |
}; | |
}} | |
#endif |