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