| // Copyright (c) 2001-2011 Hartmut Kaiser |
| // Copyright (c) 2001-2011 Joel de Guzman |
| // |
| // 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(SPIRIT_KARMA_SEQUENCE_FEB_28_2007_0247PM) |
| #define SPIRIT_KARMA_SEQUENCE_FEB_28_2007_0247PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/karma/domain.hpp> |
| #include <boost/spirit/home/karma/generator.hpp> |
| #include <boost/spirit/home/karma/meta_compiler.hpp> |
| #include <boost/spirit/home/karma/detail/fail_function.hpp> |
| #include <boost/spirit/home/karma/detail/pass_container.hpp> |
| #include <boost/spirit/home/karma/detail/get_stricttag.hpp> |
| #include <boost/spirit/home/support/info.hpp> |
| #include <boost/spirit/home/support/detail/what_function.hpp> |
| #include <boost/spirit/home/karma/detail/attributes.hpp> |
| #include <boost/spirit/home/karma/detail/indirect_iterator.hpp> |
| #include <boost/spirit/home/support/algorithm/any_if.hpp> |
| #include <boost/spirit/home/support/unused.hpp> |
| #include <boost/spirit/home/support/sequence_base_id.hpp> |
| #include <boost/spirit/home/support/has_semantic_action.hpp> |
| #include <boost/spirit/home/support/handles_container.hpp> |
| #include <boost/spirit/home/support/attributes.hpp> |
| #include <boost/fusion/include/vector.hpp> |
| #include <boost/fusion/include/as_vector.hpp> |
| #include <boost/fusion/include/for_each.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| #include <boost/mpl/bitor.hpp> |
| #include <boost/mpl/int.hpp> |
| #include <boost/mpl/and.hpp> |
| #include <boost/mpl/not.hpp> |
| #include <boost/fusion/include/transform.hpp> |
| #include <boost/mpl/accumulate.hpp> |
| #include <boost/config.hpp> |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <> |
| struct use_operator<karma::domain, proto::tag::shift_left> // enables << |
| : mpl::true_ {}; |
| |
| template <> |
| struct flatten_tree<karma::domain, proto::tag::shift_left> // flattens << |
| : mpl::true_ {}; |
| }} |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| namespace boost { namespace spirit { namespace traits |
| { |
| // specialization for sequences |
| template <typename Elements> |
| struct sequence_properties |
| { |
| struct element_properties |
| { |
| template <typename T> |
| struct result; |
| |
| template <typename F, typename Element> |
| struct result<F(Element)> |
| { |
| typedef properties_of<Element> type; |
| }; |
| |
| // never called, but needed for decltype-based result_of (C++0x) |
| #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES |
| template <typename Element> |
| typename result<element_properties(Element)>::type |
| operator()(Element&&) const; |
| #endif |
| }; |
| |
| typedef typename mpl::accumulate< |
| typename fusion::result_of::transform< |
| Elements, element_properties>::type |
| , mpl::int_<karma::generator_properties::no_properties> |
| , mpl::bitor_<mpl::_2, mpl::_1> |
| >::type type; |
| }; |
| }}} |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| namespace boost { namespace spirit { namespace karma |
| { |
| template <typename Elements, typename Strict, typename Derived> |
| struct base_sequence : nary_generator<Derived> |
| { |
| typedef typename traits::sequence_properties<Elements>::type properties; |
| |
| base_sequence(Elements const& elements) |
| : elements(elements) {} |
| |
| typedef Elements elements_type; |
| struct sequence_base_id; |
| |
| template <typename Context, typename Iterator = unused_type> |
| struct attribute |
| { |
| // Put all the element attributes in a tuple |
| typedef typename traits::build_attribute_sequence< |
| Elements, Context, traits::sequence_attribute_transform |
| , Iterator, karma::domain |
| >::type all_attributes; |
| |
| // Now, build a fusion vector over the attributes. Note |
| // that build_fusion_vector 1) removes all unused attributes |
| // and 2) may return unused_type if all elements have |
| // unused_type(s). |
| typedef typename |
| traits::build_fusion_vector<all_attributes>::type |
| type_; |
| |
| // Finally, strip single element vectors into its |
| // naked form: vector1<T> --> T |
| typedef typename |
| traits::strip_single_element_vector<type_>::type |
| type; |
| }; |
| |
| // standard case. Attribute is a fusion tuple |
| template < |
| typename OutputIterator, typename Context, typename Delimiter |
| , typename Attribute, typename Pred1, typename Pred2> |
| bool generate_impl(OutputIterator& sink, Context& ctx |
| , Delimiter const& d, Attribute& attr_, Pred1, Pred2) const |
| { |
| typedef detail::fail_function< |
| OutputIterator, Context, Delimiter> fail_function; |
| typedef traits::attribute_not_unused<Context> predicate; |
| |
| // wrap the attribute in a tuple if it is not a tuple or if the |
| // attribute of this sequence is a single element tuple |
| typedef typename attribute<Context>::type_ attr_type_; |
| typename traits::wrap_if_not_tuple<Attribute |
| , typename mpl::and_< |
| traits::one_element_sequence<attr_type_> |
| , mpl::not_<traits::one_element_sequence<Attribute> > |
| >::type |
| >::type attr(attr_); |
| |
| // return false if *any* of the generators fail |
| bool r = spirit::any_if(elements, attr |
| , fail_function(sink, ctx, d), predicate()); |
| |
| typedef typename traits::attribute_size<Attribute>::type size_type; |
| |
| // fail generating if sequences have not the same (logical) length |
| return !r && (!Strict::value || |
| // This ignores container element count (which is not good), |
| // but allows valid attributes to succeed. This will lead to |
| // false positives (failing generators, even if they shouldn't) |
| // if the embedded component is restricting the number of |
| // container elements it consumes (i.e. repeat). This solution |
| // is not optimal but much better than letting _all_ repetitive |
| // components fail. |
| Pred1::value || |
| size_type(traits::sequence_size<attr_type_>::value) == traits::size(attr_)); |
| } |
| |
| // Special case when Attribute is an stl container and the sequence's |
| // attribute is not a one element sequence |
| template < |
| typename OutputIterator, typename Context, typename Delimiter |
| , typename Attribute> |
| bool generate_impl(OutputIterator& sink, Context& ctx |
| , Delimiter const& d, Attribute const& attr_ |
| , mpl::true_, mpl::false_) const |
| { |
| // return false if *any* of the generators fail |
| typedef detail::fail_function< |
| OutputIterator, Context, Delimiter> fail_function; |
| |
| typedef typename traits::container_iterator< |
| typename add_const<Attribute>::type |
| >::type iterator_type; |
| |
| typedef |
| typename traits::make_indirect_iterator<iterator_type>::type |
| indirect_iterator_type; |
| typedef detail::pass_container< |
| fail_function, Attribute, indirect_iterator_type, mpl::true_> |
| pass_container; |
| |
| iterator_type begin = traits::begin(attr_); |
| iterator_type end = traits::end(attr_); |
| |
| pass_container pass(fail_function(sink, ctx, d), |
| indirect_iterator_type(begin), indirect_iterator_type(end)); |
| bool r = fusion::any(elements, pass); |
| |
| // fail generating if sequences have not the same (logical) length |
| return !r && (!Strict::value || begin == end); |
| } |
| |
| // main generate function. Dispatches to generate_impl depending |
| // on the Attribute type. |
| template < |
| typename OutputIterator, typename Context, typename Delimiter |
| , typename Attribute> |
| bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d |
| , Attribute const& attr) const |
| { |
| typedef typename traits::is_container<Attribute>::type |
| is_container; |
| |
| typedef typename attribute<Context>::type_ attr_type_; |
| typedef typename traits::one_element_sequence<attr_type_>::type |
| is_one_element_sequence; |
| |
| return generate_impl(sink, ctx, d, attr, is_container() |
| , is_one_element_sequence()); |
| } |
| |
| template <typename Context> |
| info what(Context& context) const |
| { |
| info result("sequence"); |
| fusion::for_each(elements, |
| spirit::detail::what_function<Context>(result, context)); |
| return result; |
| } |
| |
| Elements elements; |
| }; |
| |
| template <typename Elements> |
| struct sequence |
| : base_sequence<Elements, mpl::false_, sequence<Elements> > |
| { |
| typedef base_sequence<Elements, mpl::false_, sequence> base_sequence_; |
| |
| sequence(Elements const& subject) |
| : base_sequence_(subject) {} |
| }; |
| |
| template <typename Elements> |
| struct strict_sequence |
| : base_sequence<Elements, mpl::true_, strict_sequence<Elements> > |
| { |
| typedef base_sequence<Elements, mpl::true_, strict_sequence> |
| base_sequence_; |
| |
| strict_sequence(Elements const& subject) |
| : base_sequence_(subject) {} |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Generator generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| namespace detail |
| { |
| template <typename Elements, bool strict_mode = false> |
| struct make_sequence |
| : make_nary_composite<Elements, sequence> |
| {}; |
| |
| template <typename Elements> |
| struct make_sequence<Elements, true> |
| : make_nary_composite<Elements, strict_sequence> |
| {}; |
| } |
| |
| template <typename Elements, typename Modifiers> |
| struct make_composite<proto::tag::shift_left, Elements, Modifiers> |
| : detail::make_sequence<Elements, detail::get_stricttag<Modifiers>::value> |
| {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Helper template allowing to get the required container type for a rule |
| // attribute, which is part of a sequence. |
| template <typename Iterator> |
| struct make_sequence_iterator_range |
| { |
| typedef iterator_range<detail::indirect_iterator<Iterator> > type; |
| }; |
| }}} |
| |
| namespace boost { namespace spirit { namespace traits |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Elements> |
| struct has_semantic_action<karma::sequence<Elements> > |
| : nary_has_semantic_action<Elements> {}; |
| |
| template <typename Elements> |
| struct has_semantic_action<karma::strict_sequence<Elements> > |
| : nary_has_semantic_action<Elements> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Elements, typename Attribute, typename Context |
| , typename Iterator> |
| struct handles_container<karma::sequence<Elements>, Attribute, Context |
| , Iterator> |
| : mpl::true_ {}; |
| |
| template <typename Elements, typename Attribute, typename Context |
| , typename Iterator> |
| struct handles_container<karma::strict_sequence<Elements>, Attribute |
| , Context, Iterator> |
| : mpl::true_ {}; |
| }}} |
| |
| #endif |
