| // 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/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> | |
| /////////////////////////////////////////////////////////////////////////////// | |
| 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) | |
| template <typename Element> | |
| typename result<element_properties(Element)>::type | |
| operator()(Element&) const; | |
| }; | |
| 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 | |
| { | |
| namespace detail | |
| { | |
| /////////////////////////////////////////////////////////////////////// | |
| // This is a wrapper for any iterator allowing to pass a reference of it | |
| // to the components of the sequence | |
| template <typename Iterator> | |
| class indirect_iterator | |
| : public boost::iterator_facade< | |
| indirect_iterator<Iterator> | |
| , typename boost::detail::iterator_traits<Iterator>::value_type | |
| , boost::forward_traversal_tag | |
| , typename boost::detail::iterator_traits<Iterator>::value_type const&> | |
| { | |
| typedef typename boost::detail::iterator_traits<Iterator>::value_type | |
| base_value_type; | |
| typedef boost::iterator_facade< | |
| indirect_iterator<Iterator>, base_value_type | |
| , boost::forward_traversal_tag, base_value_type const& | |
| > base_type; | |
| public: | |
| indirect_iterator(Iterator& iter) | |
| : iter_(&iter) | |
| {} | |
| indirect_iterator(indirect_iterator const& iter) | |
| : iter_(iter.iter_) | |
| {} | |
| private: | |
| friend class boost::iterator_core_access; | |
| void increment() | |
| { | |
| ++*iter_; | |
| } | |
| bool equal(indirect_iterator const& other) const | |
| { | |
| return *iter_ == *other.iter_; | |
| } | |
| typename base_type::reference dereference() const | |
| { | |
| return **iter_; | |
| } | |
| private: | |
| Iterator* iter_; | |
| }; | |
| template <typename Iterator> | |
| struct make_indirect_iterator | |
| { | |
| typedef indirect_iterator<Iterator> type; | |
| }; | |
| template <typename Iterator> | |
| struct make_indirect_iterator<indirect_iterator<Iterator> > | |
| { | |
| typedef indirect_iterator<Iterator> type; | |
| }; | |
| template <> | |
| struct make_indirect_iterator<unused_type const*> | |
| { | |
| typedef unused_type const* type; | |
| }; | |
| } | |
| 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<Attribute const>::type | |
| iterator_type; | |
| typedef typename detail::make_indirect_iterator<iterator_type>::type | |
| indirect_iterator_type; | |
| typedef detail::pass_container< | |
| fail_function, Attribute, indirect_iterator_type, Strict> | |
| 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> | |
| : nary_handles_container<Elements, Attribute, Context, Iterator> {}; | |
| template <typename Elements, typename Attribute, typename Context | |
| , typename Iterator> | |
| struct handles_container<karma::strict_sequence<Elements>, Attribute | |
| , Context, Iterator> | |
| : nary_handles_container<Elements, Attribute, Context, Iterator> {}; | |
| }}} | |
| #endif |