231 lines
7.9 KiB
C++
231 lines
7.9 KiB
C++
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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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#ifndef BOOST_SPIRIT_KARMA_DIRECTIVE_DUPLICATE_HPP
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#define BOOST_SPIRIT_KARMA_DIRECTIVE_DUPLICATE_HPP
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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/meta_compiler.hpp>
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#include <boost/spirit/home/karma/generator.hpp>
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#include <boost/spirit/home/karma/domain.hpp>
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#include <boost/spirit/home/karma/detail/attributes.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/common_terminals.hpp>
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#include <boost/spirit/home/support/assert_msg.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/fusion/include/cons.hpp>
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#include <boost/fusion/include/make_cons.hpp>
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#include <boost/fusion/include/vector.hpp>
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#include <boost/fusion/include/at_c.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <>
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struct use_directive<karma::domain, tag::duplicate> // enables duplicate
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: mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace karma
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{
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
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using spirit::duplicate;
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#endif
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using spirit::duplicate_type;
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///////////////////////////////////////////////////////////////////////////
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namespace detail
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{
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///////////////////////////////////////////////////////////////////////
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template <typename T
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, bool IsSequence = fusion::traits::is_sequence<T>::value>
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struct attribute_count
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: fusion::result_of::size<T>
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{};
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template <>
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struct attribute_count<unused_type, false>
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: mpl::int_<0>
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{};
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template <typename T>
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struct attribute_count<T, false>
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: mpl::int_<1>
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{};
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///////////////////////////////////////////////////////////////////////
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template <typename T
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, bool IsSequence = fusion::traits::is_sequence<T>::value>
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struct first_attribute_of_subject
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: remove_reference<typename fusion::result_of::at_c<T, 0>::type>
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{};
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template <typename T>
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struct first_attribute_of_subject<T, false>
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: mpl::identity<T>
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{};
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template <typename T, typename Context, typename Iterator>
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struct first_attribute_of
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: first_attribute_of_subject<
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typename traits::attribute_of<T, Context, Iterator>::type>
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{};
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///////////////////////////////////////////////////////////////////////
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template <typename Attribute, typename T, int N>
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struct duplicate_sequence_attribute
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{
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typedef typename fusion::result_of::make_cons<
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reference_wrapper<T const>
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, typename duplicate_sequence_attribute<Attribute, T, N-1>::type
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>::type type;
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static type call(T const& t)
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{
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return fusion::make_cons(boost::cref(t)
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, duplicate_sequence_attribute<Attribute, T, N-1>::call(t));
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}
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};
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template <typename Attribute, typename T>
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struct duplicate_sequence_attribute<Attribute, T, 1>
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{
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typedef typename fusion::result_of::make_cons<
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reference_wrapper<T const> >::type type;
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static type call(T const& t)
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{
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return fusion::make_cons(boost::cref(t));
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}
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};
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///////////////////////////////////////////////////////////////////////
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template <typename Attribute, typename T
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, int N = attribute_count<Attribute>::value
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, bool IsSequence = fusion::traits::is_sequence<Attribute>::value>
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struct duplicate_attribute
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{
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BOOST_SPIRIT_ASSERT_MSG(N > 0, invalid_duplication_count, (Attribute));
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typedef typename duplicate_sequence_attribute<Attribute, T, N>::type
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cons_type;
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typedef typename fusion::result_of::as_vector<cons_type>::type type;
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static type call(T const& t)
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{
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return fusion::as_vector(
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duplicate_sequence_attribute<Attribute, T, N>::call(t));
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}
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};
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template <typename Attribute, typename T>
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struct duplicate_attribute<Attribute, T, 0, false>
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{
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typedef unused_type type;
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static type call(T const&)
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{
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return unused;
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}
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};
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template <typename Attribute, typename T, int N>
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struct duplicate_attribute<Attribute, T, N, false>
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{
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typedef Attribute const& type;
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static type call(T const& t)
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{
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return t;
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}
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};
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}
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template <typename Attribute, typename T>
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inline typename detail::duplicate_attribute<Attribute, T>::type
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duplicate_attribute(T const& t)
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{
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return detail::duplicate_attribute<Attribute, T>::call(t);
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}
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///////////////////////////////////////////////////////////////////////////
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// duplicate_directive duplicate its attribute for all elements of the
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// subject generator without generating anything itself
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject>
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struct duplicate_directive : unary_generator<duplicate_directive<Subject> >
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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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duplicate_directive(Subject const& subject)
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: subject(subject) {}
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template <typename Context, typename Iterator = unused_type>
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struct attribute
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: detail::first_attribute_of<Subject, Context, Iterator>
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{};
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template <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 traits::attribute_of<Subject, Context>::type
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subject_attr_type;
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return subject.generate(sink, ctx, d
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, duplicate_attribute<subject_attr_type>(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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return info("duplicate", subject.what(context));
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}
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Subject subject;
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};
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///////////////////////////////////////////////////////////////////////////
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// Generator generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject, typename Modifiers>
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struct make_directive<tag::duplicate, Subject, Modifiers>
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{
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typedef duplicate_directive<Subject> result_type;
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result_type operator()(unused_type, Subject const& subject
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, unused_type) const
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{
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return result_type(subject);
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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>
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struct has_semantic_action<karma::duplicate_directive<Subject> >
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: unary_has_semantic_action<Subject> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject, typename Attribute, typename Context
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, typename Iterator>
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struct handles_container<karma::duplicate_directive<Subject>, 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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