| /*============================================================================= |
| Copyright (c) 2001-2010 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_ARGUMENT_FEBRUARY_17_2007_0339PM) |
| #define BOOST_SPIRIT_ARGUMENT_FEBRUARY_17_2007_0339PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/preprocessor/repetition/repeat_from_to.hpp> |
| #include <boost/preprocessor/arithmetic/inc.hpp> |
| #include <boost/spirit/home/phoenix/core/actor.hpp> |
| #include <boost/spirit/home/phoenix/core/argument.hpp> |
| #include <boost/spirit/home/support/assert_msg.hpp> |
| #include <boost/fusion/include/at.hpp> |
| #include <boost/fusion/include/size.hpp> |
| #include <boost/mpl/size.hpp> |
| #include <boost/mpl/at.hpp> |
| |
| #if !defined(SPIRIT_ARGUMENTS_LIMIT) |
| # define SPIRIT_ARGUMENTS_LIMIT PHOENIX_LIMIT |
| #endif |
| |
| #define SPIRIT_DECLARE_ARG(z, n, data) \ |
| phoenix::actor<argument<n> > const \ |
| BOOST_PP_CAT(_, BOOST_PP_INC(n)) = argument<n>(); |
| |
| #define SPIRIT_USING_ARGUMENT(z, n, data) using spirit::BOOST_PP_CAT(_, n); |
| |
| namespace boost { namespace spirit |
| { |
| namespace result_of |
| { |
| template <typename Sequence, int N> |
| struct get_arg |
| { |
| typedef typename |
| fusion::result_of::size<Sequence>::type |
| sequence_size; |
| |
| // report invalid argument not found (N is out of bounds) |
| BOOST_SPIRIT_ASSERT_MSG( |
| (N < sequence_size::value), |
| index_is_out_of_bounds, ()); |
| |
| typedef typename |
| fusion::result_of::at_c<Sequence, N>::type |
| type; |
| |
| static type call(Sequence& seq) |
| { |
| return fusion::at_c<N>(seq); |
| } |
| }; |
| |
| template <typename Sequence, int N> |
| struct get_arg<Sequence&, N> : get_arg<Sequence, N> |
| { |
| }; |
| } |
| |
| template <int N, typename T> |
| typename result_of::get_arg<T, N>::type |
| get_arg(T& val) |
| { |
| return result_of::get_arg<T, N>::call(val); |
| } |
| |
| struct attribute_context |
| { |
| typedef mpl::true_ no_nullary; |
| |
| template <typename Env> |
| struct result |
| { |
| // FIXME: is this remove_const really necessary? |
| typedef typename |
| remove_const< |
| typename mpl::at_c<typename Env::args_type, 0>::type |
| >::type |
| type; |
| }; |
| |
| template <typename Env> |
| typename result<Env>::type |
| eval(Env const& env) const |
| { |
| return fusion::at_c<0>(env.args()); |
| } |
| }; |
| |
| template <int N> |
| struct argument |
| { |
| typedef mpl::true_ no_nullary; |
| |
| template <typename Env> |
| struct result |
| { |
| typedef typename |
| mpl::at_c<typename Env::args_type, 0>::type |
| arg_type; |
| |
| typedef typename result_of::get_arg<arg_type, N>::type type; |
| }; |
| |
| template <typename Env> |
| typename result<Env>::type |
| eval(Env const& env) const |
| { |
| return get_arg<N>(fusion::at_c<0>(env.args())); |
| } |
| }; |
| |
| // _0 refers to the whole attribute as generated by the lhs parser |
| phoenix::actor<attribute_context> const _0 = attribute_context(); |
| |
| // _1, _2, ... refer to the attributes of the single components the lhs |
| // parser is composed of |
| phoenix::actor<argument<0> > const _1 = argument<0>(); |
| phoenix::actor<argument<1> > const _2 = argument<1>(); |
| phoenix::actor<argument<2> > const _3 = argument<2>(); |
| |
| // '_pass' may be used to make a match fail in retrospective |
| phoenix::actor<phoenix::argument<2> > const _pass = phoenix::argument<2>(); |
| |
| // Bring in the rest of the arguments and attributes (_4 .. _N+1), using PP |
| BOOST_PP_REPEAT_FROM_TO( |
| 3, SPIRIT_ARGUMENTS_LIMIT, SPIRIT_DECLARE_ARG, _) |
| |
| // You can bring these in with the using directive |
| // without worrying about bringing in too much. |
| namespace labels |
| { |
| BOOST_PP_REPEAT(SPIRIT_ARGUMENTS_LIMIT, SPIRIT_USING_ARGUMENT, _) |
| } |
| |
| }} |
| |
| #undef SPIRIT_DECLARE_ARG |
| #endif |