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/*=============================================================================
Copyright (c) 2001-2014 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_X3_CALL_CONTEXT_MAY_26_2014_0234PM)
#define BOOST_SPIRIT_X3_CALL_CONTEXT_MAY_26_2014_0234PM
#include <type_traits>
#include <boost/spirit/home/x3/support/context.hpp>
#include <boost/spirit/home/x3/support/utility/is_callable.hpp>
#include <boost/range/iterator_range.hpp>
namespace boost { namespace spirit { namespace x3
{
////////////////////////////////////////////////////////////////////////////
struct rule_val_context_tag;
template <typename Context>
inline decltype(auto) _val(Context const& context)
{
return x3::get<rule_val_context_tag>(context);
}
////////////////////////////////////////////////////////////////////////////
struct where_context_tag;
template <typename Context>
inline decltype(auto) _where(Context const& context)
{
return x3::get<where_context_tag>(context);
}
////////////////////////////////////////////////////////////////////////////
struct attr_context_tag;
template <typename Context>
inline decltype(auto) _attr(Context const& context)
{
return x3::get<attr_context_tag>(context);
}
////////////////////////////////////////////////////////////////////////////
namespace detail
{
template <typename F, typename Context>
auto call(F f, Context const& context, mpl::true_)
{
return f(context);
}
template <typename F, typename Context>
auto call(F f, Context const& /* context */, mpl::false_)
{
return f();
}
}
template <
typename F, typename Iterator
, typename Context, typename RuleContext, typename Attribute>
auto call(
F f, Iterator& first, Iterator const& last
, Context const& context, RuleContext& rcontext, Attribute& attr)
{
boost::iterator_range<Iterator> rng(first, last);
auto val_context = make_context<rule_val_context_tag>(rcontext, context);
auto where_context = make_context<where_context_tag>(rng, val_context);
auto attr_context = make_context<attr_context_tag>(attr, where_context);
return detail::call(f, attr_context, is_callable<F(decltype(attr_context) const&)>());
}
}}}
#endif
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