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// 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_KARMA_ACTION_MAR_07_2007_0851AM) #define BOOST_SPIRIT_KARMA_ACTION_MAR_07_2007_0851AM #if defined(_MSC_VER) #pragma once #endif #include <boost/spirit/home/karma/detail/attributes.hpp> #include <boost/spirit/home/support/argument.hpp> #include <boost/spirit/home/support/context.hpp> #include <boost/spirit/home/support/unused.hpp> #include <boost/spirit/home/support/info.hpp> #include <boost/spirit/home/support/action_dispatch.hpp> #include <boost/spirit/home/support/has_semantic_action.hpp> #include <boost/spirit/home/support/handles_container.hpp> #include <boost/spirit/home/karma/domain.hpp> #include <boost/spirit/home/karma/meta_compiler.hpp> #include <boost/spirit/home/karma/generator.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/if.hpp> #include <boost/type_traits/remove_const.hpp> #include <boost/type_traits/is_same.hpp> namespace boost { namespace spirit { namespace karma { /////////////////////////////////////////////////////////////////////////// BOOST_PP_REPEAT(SPIRIT_ARGUMENTS_LIMIT, SPIRIT_USING_ARGUMENT, _) template <typename Subject, typename Action> struct action : unary_generator<action<Subject, Action> > { typedef Subject subject_type; typedef typename subject_type::properties properties; template <typename Context, typename Iterator> struct attribute : traits::attribute_of<Subject, Context, Iterator> {}; action(Subject const& subject, Action f) : subject(subject), f(f) {} template < typename OutputIterator, typename Context, typename Delimiter , typename Attribute> bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d , Attribute const& attr_) const { typedef typename attribute<Context, unused_type>::type attr_type; // create a attribute if none is supplied // this creates a _copy_ of the attribute because the semantic // action will likely change parts of this typedef traits::transform_attribute< Attribute const, attr_type, domain> transform; attr_type attr = transform::pre(attr_); // call the function, passing the attribute, the context and a bool // flag that the client can set to false to fail generating. return traits::action_dispatch<Subject>()(f, attr, ctx) && subject.generate(sink, ctx, d, attr); } template <typename Context> info what(Context& context) const { // the action is transparent (does not add any info) return subject.what(context); } subject_type subject; Action f; }; }}} /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // Karma action meta-compiler template <> struct make_component<karma::domain, tag::action> { template <typename Sig> struct result; template <typename This, typename Elements, typename Modifiers> struct result<This(Elements, Modifiers)> { typedef typename remove_const<typename Elements::car_type>::type subject_type; typedef typename remove_const<typename Elements::cdr_type::car_type>::type action_type; typedef karma::action<subject_type, action_type> type; }; template <typename Elements> typename result<make_component(Elements, unused_type)>::type operator()(Elements const& elements, unused_type) const { typename result<make_component(Elements, unused_type)>::type result(elements.car, elements.cdr.car); return result; } }; }} namespace boost { namespace spirit { namespace traits { /////////////////////////////////////////////////////////////////////////// template <typename Subject, typename Action> struct has_semantic_action<karma::action<Subject, Action> > : mpl::true_ {}; /////////////////////////////////////////////////////////////////////////// template <typename Subject, typename Action, typename Attribute , typename Context, typename Iterator> struct handles_container<karma::action<Subject, Action>, Attribute , Context, Iterator> : unary_handles_container<Subject, Attribute, Context, Iterator> {}; }}} #endif