| // 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; |
| typedef traits::make_attribute<attr_type, Attribute> make_attribute; |
| |
| // 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< |
| typename make_attribute::type, attr_type, domain> transform; |
| |
| typename transform::type attr = |
| traits::pre_transform<domain, attr_type>(make_attribute::call(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 |