// Copyright (c) 2001-2011 Joel de Guzman | |
// Copyright (c) 2001-2011 Hartmut Kaiser | |
// | |
// 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_GENERATOR_BINDER_APR_17_2009_0952PM) | |
#define BOOST_SPIRIT_GENERATOR_BINDER_APR_17_2009_0952PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/fusion/include/at.hpp> | |
#include <boost/mpl/bool.hpp> | |
#include <boost/spirit/home/support/has_semantic_action.hpp> | |
namespace boost { namespace spirit { namespace karma { namespace detail | |
{ | |
// generator_binder for plain rules | |
template <typename Generator, typename Auto> | |
struct generator_binder | |
{ | |
generator_binder(Generator const& g) | |
: g(g) {} | |
template <typename OutputIterator, typename Delimiter, typename Context> | |
bool call(OutputIterator& sink, Context& context | |
, Delimiter const& delim, mpl::true_) const | |
{ | |
// If DeducedAuto is false (semantic actions is present), the | |
// component's attribute is unused. | |
return g.generate(sink, context, delim, unused); | |
} | |
template <typename OutputIterator, typename Delimiter, typename Context> | |
bool call(OutputIterator& sink, Context& context | |
, Delimiter const& delim, mpl::false_) const | |
{ | |
// If DeducedAuto is true (no semantic action), we pass the rule's | |
// attribute on to the component. | |
return g.generate(sink, context, delim | |
, fusion::at_c<0>(context.attributes)); | |
} | |
template <typename OutputIterator, typename Delimiter, typename Context> | |
bool operator()(OutputIterator& sink, Context& context | |
, Delimiter const& delim) const | |
{ | |
// If Auto is false, we need to deduce whether to apply auto rule | |
typedef typename traits::has_semantic_action<Generator>::type auto_rule; | |
return call(sink, context, delim, auto_rule()); | |
} | |
Generator g; | |
}; | |
// generator_binder for auto rules | |
template <typename Generator> | |
struct generator_binder<Generator, mpl::true_> | |
{ | |
generator_binder(Generator const& g) | |
: g(g) {} | |
template <typename OutputIterator, typename Delimiter, typename Context> | |
bool operator()(OutputIterator& sink, Context& context | |
, Delimiter const& delim) const | |
{ | |
// If Auto is true, the component's attribute is unused. | |
return g.generate(sink, context, delim | |
, fusion::at_c<0>(context.attributes)); | |
} | |
Generator g; | |
}; | |
template <typename Auto, typename Generator> | |
inline generator_binder<Generator, Auto> | |
bind_generator(Generator const& g) | |
{ | |
return generator_binder<Generator, Auto>(g); | |
} | |
}}}} | |
#endif |