boost/spirit/home/support/context.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_CONTEXT_OCTOBER_31_2008_0654PM)
#define BOOST_SPIRIT_CONTEXT_OCTOBER_31_2008_0654PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/spirit/home/support/nonterminal/expand_arg.hpp>
#include <boost/spirit/home/support/assert_msg.hpp>
#include <boost/spirit/home/support/argument.hpp>
#include <boost/spirit/home/support/limits.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/size.hpp>
#include <boost/fusion/include/as_list.hpp>
#include <boost/fusion/include/transform.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/at.hpp>
#include <boost/phoenix/core/actor.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_ATTRIBUTE(z, n, data) \
typedef phoenix::actor<attribute<n> > \
BOOST_PP_CAT(BOOST_PP_CAT(_r, n), _type); \
phoenix::actor<attribute<n> > const \
BOOST_PP_CAT(_r, n) = BOOST_PP_CAT(BOOST_PP_CAT(_r, n), _type)();
/***/
#define SPIRIT_USING_ATTRIBUTE(z, n, data) \
using spirit::BOOST_PP_CAT(BOOST_PP_CAT(_r, n), _type); \
using spirit::BOOST_PP_CAT(_r, n); \
/***/
#else
#define SPIRIT_DECLARE_ATTRIBUTE(z, n, data) \
typedef phoenix::actor<attribute<n> > \
BOOST_PP_CAT(BOOST_PP_CAT(_r, n), _type); \
/***/
#define SPIRIT_USING_ATTRIBUTE(z, n, data) \
using spirit::BOOST_PP_CAT(BOOST_PP_CAT(_r, n), _type); \
/***/
#endif
namespace boost { namespace spirit
{
template <int>
struct attribute;
template <int>
struct local_variable;
}}
BOOST_PHOENIX_DEFINE_CUSTOM_TERMINAL(
template <int N>
, boost::spirit::attribute<N>
, mpl::false_ // is not nullary
, v2_eval(
proto::make<
boost::spirit::attribute<N>()
>
, proto::call<
functional::env(proto::_state)
>
)
)
BOOST_PHOENIX_DEFINE_CUSTOM_TERMINAL(
template <int N>
, boost::spirit::local_variable<N>
, mpl::false_ // is not nullary
, v2_eval(
proto::make<
boost::spirit::local_variable<N>()
>
, proto::call<
functional::env(proto::_state)
>
)
)
namespace boost { namespace spirit
{
template <typename Attributes, typename Locals>
struct context
{
typedef Attributes attributes_type;
typedef Locals locals_type;
context(typename Attributes::car_type attribute)
: attributes(attribute, fusion::nil_()), locals() {}
template <typename Args, typename Context>
context(
typename Attributes::car_type attribute
, Args const& args
, Context& caller_context
) : attributes(
attribute
, fusion::as_list(
fusion::transform(
args
, detail::expand_arg<Context>(caller_context)
)
)
)
, locals() {}
context(Attributes const& attributes_)
: attributes(attributes_), locals() {}
Attributes attributes; // The attributes
Locals locals; // Local variables
};
template <typename Context>
struct attributes_of
{
typedef typename Context::attributes_type type;
};
template <typename Context>
struct attributes_of<Context const>
{
typedef typename Context::attributes_type const type;
};
template <typename Context>
struct attributes_of<Context &>
: attributes_of<Context>
{};
template <typename Context>
struct locals_of
{
typedef typename Context::locals_type type;
};
template <typename Context>
struct locals_of<Context const>
{
typedef typename Context::locals_type const type;
};
template <typename Context>
struct locals_of<Context &>
{
typedef typename Context::locals_type type;
};
template <int N>
struct attribute
{
typedef mpl::true_ no_nullary;
template <typename Env>
struct result
{
typedef typename
attributes_of<typename
mpl::at_c<typename Env::args_type, 1>::type
>::type
attributes_type;
typedef typename
fusion::result_of::size<attributes_type>::type
attributes_size;
// report invalid argument not found (N is out of bounds)
BOOST_SPIRIT_ASSERT_MSG(
(N < attributes_size::value),
index_is_out_of_bounds, ());
typedef typename
fusion::result_of::at_c<attributes_type, N>::type
type;
};
template <typename Env>
typename result<Env>::type
eval(Env const& env) const
{
return fusion::at_c<N>((fusion::at_c<1>(env.args())).attributes);
}
};
template <int N>
struct local_variable
{
typedef mpl::true_ no_nullary;
template <typename Env>
struct result
{
typedef typename
locals_of<typename
mpl::at_c<typename Env::args_type, 1>::type
>::type
locals_type;
typedef typename
fusion::result_of::size<locals_type>::type
locals_size;
// report invalid argument not found (N is out of bounds)
BOOST_SPIRIT_ASSERT_MSG(
(N < locals_size::value),
index_is_out_of_bounds, ());
typedef typename
fusion::result_of::at_c<locals_type, N>::type
type;
};
template <typename Env>
typename result<Env>::type
eval(Env const& env) const
{
return get_arg<N>((fusion::at_c<1>(env.args())).locals);
}
};
typedef phoenix::actor<attribute<0> > _val_type;
typedef phoenix::actor<attribute<0> > _r0_type;
typedef phoenix::actor<attribute<1> > _r1_type;
typedef phoenix::actor<attribute<2> > _r2_type;
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
// _val refers to the 'return' value of a rule (same as _r0)
// _r1, _r2, ... refer to the rule arguments
_val_type const _val = _val_type();
_r0_type const _r0 = _r0_type();
_r1_type const _r1 = _r1_type();
_r2_type const _r2 = _r2_type();
#endif
// Bring in the rest of the attributes (_r4 .. _rN+1), using PP
BOOST_PP_REPEAT_FROM_TO(
3, SPIRIT_ATTRIBUTES_LIMIT, SPIRIT_DECLARE_ATTRIBUTE, _)
typedef phoenix::actor<local_variable<0> > _a_type;
typedef phoenix::actor<local_variable<1> > _b_type;
typedef phoenix::actor<local_variable<2> > _c_type;
typedef phoenix::actor<local_variable<3> > _d_type;
typedef phoenix::actor<local_variable<4> > _e_type;
typedef phoenix::actor<local_variable<5> > _f_type;
typedef phoenix::actor<local_variable<6> > _g_type;
typedef phoenix::actor<local_variable<7> > _h_type;
typedef phoenix::actor<local_variable<8> > _i_type;
typedef phoenix::actor<local_variable<9> > _j_type;
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
// _a, _b, ... refer to the local variables of a rule
_a_type const _a = _a_type();
_b_type const _b = _b_type();
_c_type const _c = _c_type();
_d_type const _d = _d_type();
_e_type const _e = _e_type();
_f_type const _f = _f_type();
_g_type const _g = _g_type();
_h_type const _h = _h_type();
_i_type const _i = _i_type();
_j_type const _j = _j_type();
#endif
// 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, _)
BOOST_PP_REPEAT(SPIRIT_ATTRIBUTES_LIMIT, SPIRIT_USING_ATTRIBUTE, _)
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
using spirit::_val;
using spirit::_a;
using spirit::_b;
using spirit::_c;
using spirit::_d;
using spirit::_e;
using spirit::_f;
using spirit::_g;
using spirit::_h;
using spirit::_i;
using spirit::_j;
#endif
}
}}
#endif
