boost/spirit/home/support/argument.hpp
/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2001-2011 Hartmut Kaiser
Copyright (c) 2011 Thomas Heller
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/support/assert_msg.hpp>
#include <boost/spirit/home/support/limits.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/size.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/at.hpp>
#include <boost/phoenix/core/actor.hpp>
#include <boost/phoenix/core/argument.hpp>
#include <boost/phoenix/core/terminal.hpp>
#include <boost/phoenix/core/v2_eval.hpp>
#include <boost/proto/proto_fwd.hpp> // for transform placeholders
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
#define SPIRIT_DECLARE_ARG(z, n, data) \
typedef phoenix::actor<argument<n> > \
BOOST_PP_CAT(BOOST_PP_CAT(_, BOOST_PP_INC(n)), _type); \
phoenix::actor<argument<n> > const \
BOOST_PP_CAT(_, BOOST_PP_INC(n)) = \
BOOST_PP_CAT(BOOST_PP_CAT(_, BOOST_PP_INC(n)), _type)(); \
/***/
#define SPIRIT_USING_ARGUMENT(z, n, data) \
using spirit::BOOST_PP_CAT(BOOST_PP_CAT(_, n), _type); \
using spirit::BOOST_PP_CAT(_, n); \
/***/
#else
#define SPIRIT_DECLARE_ARG(z, n, data) \
typedef phoenix::actor<argument<n> > \
BOOST_PP_CAT(BOOST_PP_CAT(_, BOOST_PP_INC(n)), _type); \
/***/
#define SPIRIT_USING_ARGUMENT(z, n, data) \
using spirit::BOOST_PP_CAT(BOOST_PP_CAT(_, n), _type); \
/***/
#endif
namespace boost { namespace spirit
{
template <int N>
struct argument;
template <typename Dummy>
struct attribute_context;
}}
BOOST_PHOENIX_DEFINE_CUSTOM_TERMINAL(
template <int N>
, boost::spirit::argument<N>
, mpl::false_ // is not nullary
, v2_eval(
proto::make<
boost::spirit::argument<N>()
>
, proto::call<
functional::env(proto::_state)
>
)
)
BOOST_PHOENIX_DEFINE_CUSTOM_TERMINAL(
template <typename Dummy>
, boost::spirit::attribute_context<Dummy>
, mpl::false_ // is not nullary
, v2_eval(
proto::make<
boost::spirit::attribute_context<Dummy>()
>
, proto::call<
functional::env(proto::_state)
>
)
)
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);
}
template <typename>
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
typedef phoenix::actor<attribute_context<void> > _0_type;
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
_0_type const _0 = _0_type();
#endif
// _1, _2, ... refer to the attributes of the single components the lhs
// parser is composed of
typedef phoenix::actor<argument<0> > _1_type;
typedef phoenix::actor<argument<1> > _2_type;
typedef phoenix::actor<argument<2> > _3_type;
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
_1_type const _1 = _1_type();
_2_type const _2 = _2_type();
_3_type const _3 = _3_type();
#endif
// '_pass' may be used to make a match fail in retrospective
typedef phoenix::arg_names::_3_type _pass_type;
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
_pass_type const _pass = _pass_type();
#endif
// 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, _)
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
// 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, _)
}
#endif
}}
#undef SPIRIT_DECLARE_ARG
#endif
