// Copyright (c) 2001-2011 Joel de Guzman
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// Copyright (c) 2001-2011 Hartmut Kaiser
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//
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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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#if !defined(BOOST_SPIRIT_GENERATOR_BINDER_APR_17_2009_0952PM)
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#define BOOST_SPIRIT_GENERATOR_BINDER_APR_17_2009_0952PM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/fusion/include/at.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/spirit/home/support/has_semantic_action.hpp>
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namespace boost { namespace spirit { namespace karma { namespace detail
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{
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// generator_binder for plain rules
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template <typename Generator, typename Auto>
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struct generator_binder
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{
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generator_binder(Generator const& g)
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: g(g) {}
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template <typename OutputIterator, typename Delimiter, typename Context>
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bool call(OutputIterator& sink, Context& context
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, Delimiter const& delim, mpl::true_) const
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{
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// If DeducedAuto is false (semantic actions is present), the
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// component's attribute is unused.
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return g.generate(sink, context, delim, unused);
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}
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template <typename OutputIterator, typename Delimiter, typename Context>
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bool call(OutputIterator& sink, Context& context
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, Delimiter const& delim, mpl::false_) const
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{
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// If DeducedAuto is true (no semantic action), we pass the rule's
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// attribute on to the component.
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return g.generate(sink, context, delim
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, fusion::at_c<0>(context.attributes));
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}
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template <typename OutputIterator, typename Delimiter, typename Context>
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bool operator()(OutputIterator& sink, Context& context
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, Delimiter const& delim) const
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{
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// If Auto is false, we need to deduce whether to apply auto rule
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typedef typename traits::has_semantic_action<Generator>::type auto_rule;
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return call(sink, context, delim, auto_rule());
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}
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Generator g;
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};
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// generator_binder for auto rules
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template <typename Generator>
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struct generator_binder<Generator, mpl::true_>
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{
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generator_binder(Generator const& g)
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: g(g) {}
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template <typename OutputIterator, typename Delimiter, typename Context>
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bool operator()(OutputIterator& sink, Context& context
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, Delimiter const& delim) const
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{
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// If Auto is true, the component's attribute is unused.
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return g.generate(sink, context, delim
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, fusion::at_c<0>(context.attributes));
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}
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Generator g;
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};
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template <typename Auto, typename Generator>
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inline generator_binder<Generator, Auto>
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bind_generator(Generator const& g)
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{
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return generator_binder<Generator, Auto>(g);
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}
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}}}}
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#endif
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