/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(BOOST_SPIRIT_X3_CALL_CONTEXT_MAY_26_2014_0234PM)
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#define BOOST_SPIRIT_X3_CALL_CONTEXT_MAY_26_2014_0234PM
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#include <type_traits>
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#include <boost/spirit/home/x3/support/context.hpp>
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#include <boost/spirit/home/x3/support/utility/is_callable.hpp>
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#include <boost/range/iterator_range_core.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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////////////////////////////////////////////////////////////////////////////
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struct rule_val_context_tag;
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template <typename Context>
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inline decltype(auto) _val(Context const& context)
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{
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return x3::get<rule_val_context_tag>(context);
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}
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////////////////////////////////////////////////////////////////////////////
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struct where_context_tag;
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template <typename Context>
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inline decltype(auto) _where(Context const& context)
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{
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return x3::get<where_context_tag>(context);
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}
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////////////////////////////////////////////////////////////////////////////
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struct attr_context_tag;
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template <typename Context>
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inline decltype(auto) _attr(Context const& context)
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{
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return x3::get<attr_context_tag>(context);
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}
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////////////////////////////////////////////////////////////////////////////
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namespace detail
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{
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template <typename F, typename Context>
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auto call(F f, Context const& context, mpl::true_)
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{
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return f(context);
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}
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template <typename F, typename Context>
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auto call(F f, Context const& /* context */, mpl::false_)
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{
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return f();
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}
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}
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template <
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typename F, typename Iterator
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, typename Context, typename RuleContext, typename Attribute>
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auto call(
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F f, Iterator& first, Iterator const& last
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, Context const& context, RuleContext& rcontext, Attribute& attr)
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{
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boost::iterator_range<Iterator> rng(first, last);
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auto val_context = make_context<rule_val_context_tag>(rcontext, context);
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auto where_context = make_context<where_context_tag>(rng, val_context);
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auto attr_context = make_context<attr_context_tag>(attr, where_context);
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return detail::call(f, attr_context, is_callable<F(decltype(attr_context) const&)>());
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}
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}}}
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#endif
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