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Diffstat (limited to 'boost/spirit/home/x3/operator/detail/sequence.hpp')
| -rw-r--r-- | boost/spirit/home/x3/operator/detail/sequence.hpp | 501 |
1 files changed, 501 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/operator/detail/sequence.hpp b/boost/spirit/home/x3/operator/detail/sequence.hpp new file mode 100644 index 0000000000..1163707128 --- /dev/null +++ b/boost/spirit/home/x3/operator/detail/sequence.hpp @@ -0,0 +1,501 @@ +/*============================================================================= + Copyright (c) 2001-2014 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_SEQUENCE_DETAIL_JAN_06_2013_1015AM) +#define SPIRIT_SEQUENCE_DETAIL_JAN_06_2013_1015AM + +#if defined(_MSC_VER) +#pragma once +#endif + +#include <boost/spirit/home/x3/support/traits/attribute_of.hpp> +#include <boost/spirit/home/x3/support/traits/attribute_category.hpp> +#include <boost/spirit/home/x3/support/traits/make_attribute.hpp> +#include <boost/spirit/home/x3/support/traits/has_attribute.hpp> +#include <boost/spirit/home/x3/support/traits/is_substitute.hpp> +#include <boost/spirit/home/x3/support/traits/container_traits.hpp> +#include <boost/spirit/home/x3/core/detail/parse_into_container.hpp> + +#include <boost/fusion/include/begin.hpp> +#include <boost/fusion/include/end.hpp> +#include <boost/fusion/include/advance.hpp> +#include <boost/fusion/include/empty.hpp> +#include <boost/fusion/include/front.hpp> +#include <boost/fusion/include/iterator_range.hpp> +#include <boost/fusion/include/as_deque.hpp> +#include <boost/fusion/include/mpl.hpp> + +#include <boost/mpl/copy_if.hpp> +#include <boost/mpl/not.hpp> +#include <boost/mpl/if.hpp> +#include <boost/mpl/eval_if.hpp> +#include <boost/mpl/vector.hpp> +#include <boost/mpl/eval_if.hpp> +#include <boost/mpl/identity.hpp> + +#include <boost/type_traits/add_reference.hpp> +#include <boost/type_traits/is_same.hpp> + +namespace boost { namespace spirit { namespace x3 +{ + template <typename Left, typename Right> + struct sequence; +}}} + +namespace boost { namespace spirit { namespace x3 { namespace detail +{ + template <typename Parser, typename Context, typename Enable = void> + struct sequence_size + { + static int const value = traits::has_attribute<Parser, Context>::value; + }; + + template <typename Parser, typename Context> + struct sequence_size_subject + : sequence_size<typename Parser::subject_type, Context> {}; + + template <typename Parser, typename Context> + struct sequence_size<Parser, Context + , typename enable_if_c<(Parser::is_pass_through_unary)>::type> + : sequence_size_subject<Parser, Context> {}; + + template <typename L, typename R, typename Context> + struct sequence_size<sequence<L, R>, Context> + { + static int const value = + sequence_size<L, Context>::value + + sequence_size<R, Context>::value; + }; + + struct pass_sequence_attribute_unused + { + typedef unused_type type; + + template <typename T> + static unused_type + call(T&) + { + return unused_type(); + } + }; + + template <typename Attribute> + struct pass_sequence_attribute_front + { + typedef typename fusion::result_of::front<Attribute>::type type; + + static typename add_reference<type>::type + call(Attribute& attr) + { + return fusion::front(attr); + } + }; + + template <typename Attribute> + struct pass_through_sequence_attribute + { + typedef Attribute& type; + + template <typename Attribute_> + static Attribute_& + call(Attribute_& attr) + { + return attr; + } + }; + + template <typename Parser, typename Attribute> + struct pass_sequence_attribute_used : + mpl::if_< + traits::is_size_one_sequence<Attribute> + , pass_sequence_attribute_front<Attribute> + , pass_through_sequence_attribute<Attribute>>::type {}; + + template <typename Parser, typename Attribute, typename Enable = void> + struct pass_sequence_attribute : + mpl::if_< + fusion::result_of::empty<Attribute> + , pass_sequence_attribute_unused + , pass_sequence_attribute_used<Parser, Attribute>>::type {}; + + template <typename L, typename R, typename Attribute> + struct pass_sequence_attribute<sequence<L, R>, Attribute> + : pass_through_sequence_attribute<Attribute> {}; + + template <typename Parser, typename Attribute> + struct pass_sequence_attribute_subject : + pass_sequence_attribute<typename Parser::subject_type, Attribute> {}; + + template <typename Parser, typename Attribute> + struct pass_sequence_attribute<Parser, Attribute + , typename enable_if_c<(Parser::is_pass_through_unary)>::type> + : pass_sequence_attribute_subject<Parser, Attribute> {}; + + template <typename L, typename R, typename Attribute, typename Context + , typename Enable = void> + struct partition_attribute + { + static int const l_size = sequence_size<L, Context>::value; + static int const r_size = sequence_size<R, Context>::value; + + // If you got an error here, then you are trying to pass + // a fusion sequence with the wrong number of elements + // as that expected by the (sequence) parser. + static_assert( + fusion::result_of::size<Attribute>::value == (l_size + r_size) + , "Attribute does not have the expected size." + ); + + typedef typename fusion::result_of::begin<Attribute>::type l_begin; + typedef typename fusion::result_of::advance_c<l_begin, l_size>::type l_end; + typedef typename fusion::result_of::end<Attribute>::type r_end; + typedef fusion::iterator_range<l_begin, l_end> l_part; + typedef fusion::iterator_range<l_end, r_end> r_part; + typedef pass_sequence_attribute<L, l_part> l_pass; + typedef pass_sequence_attribute<R, r_part> r_pass; + + static l_part left(Attribute& s) + { + auto i = fusion::begin(s); + return l_part(i, fusion::advance_c<l_size>(i)); + } + + static r_part right(Attribute& s) + { + return r_part( + fusion::advance_c<l_size>(fusion::begin(s)) + , fusion::end(s)); + } + }; + + template <typename L, typename R, typename Attribute, typename Context> + struct partition_attribute<L, R, Attribute, Context, + typename enable_if_c<(!traits::has_attribute<L, Context>::value && + traits::has_attribute<R, Context>::value)>::type> + { + typedef unused_type l_part; + typedef Attribute& r_part; + typedef pass_sequence_attribute_unused l_pass; + typedef pass_sequence_attribute<R, Attribute> r_pass; + + static unused_type left(Attribute&) + { + return unused; + } + + static Attribute& right(Attribute& s) + { + return s; + } + }; + + template <typename L, typename R, typename Attribute, typename Context> + struct partition_attribute<L, R, Attribute, Context, + typename enable_if_c<(traits::has_attribute<L, Context>::value && + !traits::has_attribute<R, Context>::value)>::type> + { + typedef Attribute& l_part; + typedef unused_type r_part; + typedef pass_sequence_attribute<L, Attribute> l_pass; + typedef pass_sequence_attribute_unused r_pass; + + static Attribute& left(Attribute& s) + { + return s; + } + + static unused_type right(Attribute&) + { + return unused; + } + }; + + template <typename L, typename R, typename Attribute, typename Context> + struct partition_attribute<L, R, Attribute, Context, + typename enable_if_c<(!traits::has_attribute<L, Context>::value && + !traits::has_attribute<R, Context>::value)>::type> + { + typedef unused_type l_part; + typedef unused_type r_part; + typedef pass_sequence_attribute_unused l_pass; + typedef pass_sequence_attribute_unused r_pass; + + static unused_type left(Attribute&) + { + return unused; + } + + static unused_type right(Attribute&) + { + return unused; + } + }; + + template <typename L, typename R, typename C> + struct get_sequence_types + { + typedef + mpl::vector< + typename traits::attribute_of<L, C>::type + , typename traits::attribute_of<R, C>::type + > + type; + }; + + template <typename LL, typename LR, typename R, typename C> + struct get_sequence_types<sequence<LL, LR>, R, C> + { + typedef typename + mpl::push_back< + typename get_sequence_types<LL, LR, C>::type + , typename traits::attribute_of<R, C>::type + >::type + type; + }; + + template <typename L, typename RL, typename RR, typename C> + struct get_sequence_types<L, sequence<RL, RR>, C> + { + typedef typename + mpl::push_front< + typename get_sequence_types<RL, RR, C>::type + , typename traits::attribute_of<L, C>::type + >::type + type; + }; + + template <typename LL, typename LR, typename RL, typename RR, typename C> + struct get_sequence_types<sequence<LL, LR>, sequence<RL, RR>, C> + { + typedef + mpl::joint_view< + typename get_sequence_types<LL, LR, C>::type + , typename get_sequence_types<RL, RR, C>::type + > + type; + }; + + template <typename L, typename R, typename C> + struct attribute_of_sequence + { + // Get all sequence attribute types + typedef typename get_sequence_types<L, R, C>::type all_types; + + // Filter all unused_types + typedef typename + mpl::copy_if< + all_types + , mpl::not_<is_same<mpl::_1, unused_type>> + , mpl::back_inserter<mpl::vector<>> + >::type + filtered_types; + + // Build a fusion::deque if filtered_types is not empty, + // else just return unused_type + typedef typename + mpl::eval_if< + mpl::empty<filtered_types> + , mpl::identity<unused_type> + , mpl::if_<mpl::equal_to<mpl::size<filtered_types>, mpl::int_<1> >, + typename mpl::front<filtered_types>::type + , typename fusion::result_of::as_deque<filtered_types>::type > + >::type + type; + }; + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence( + Parser const& parser, Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr + , traits::tuple_attribute) + { + typedef typename Parser::left_type Left; + typedef typename Parser::right_type Right; + typedef partition_attribute<Left, Right, Attribute, Context> partition; + typedef typename partition::l_pass l_pass; + typedef typename partition::r_pass r_pass; + + typename partition::l_part l_part = partition::left(attr); + typename partition::r_part r_part = partition::right(attr); + typename l_pass::type l_attr = l_pass::call(l_part); + typename r_pass::type r_attr = r_pass::call(r_part); + + Iterator save = first; + if (parser.left.parse(first, last, context, rcontext, l_attr) + && parser.right.parse(first, last, context, rcontext, r_attr)) + return true; + first = save; + return false; + } + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence( + Parser const& parser , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr + , traits::plain_attribute) + { + typedef typename Parser::left_type Left; + typedef typename Parser::right_type Right; + typedef typename traits::attribute_of<Left, Context>::type l_attr_type; + typedef typename traits::attribute_of<Right, Context>::type r_attr_type; + typedef traits::make_attribute<l_attr_type, Attribute> l_make_attribute; + typedef traits::make_attribute<r_attr_type, Attribute> r_make_attribute; + + typename l_make_attribute::type l_attr = l_make_attribute::call(attr); + typename r_make_attribute::type r_attr = r_make_attribute::call(attr); + + Iterator save = first; + if (parser.left.parse(first, last, context, rcontext, l_attr) + && parser.right.parse(first, last, context, rcontext, r_attr)) + return true; + first = save; + return false; + } + + template <typename Left, typename Right, typename Iterator + , typename Context, typename RContext, typename Attribute> + bool parse_sequence( + Left const& left, Right const& right + , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr + , traits::container_attribute); + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence( + Parser const& parser , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr + , traits::container_attribute) + { + Iterator save = first; + if (parse_into_container(parser.left, first, last, context, rcontext, attr) + && parse_into_container(parser.right, first, last, context, rcontext, attr)) + return true; + first = save; + return false; + } + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence_assoc( + Parser const& parser , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr, mpl::false_ /*should_split*/) + { + return parse_into_container(parser, first, last, context, rcontext, attr); + } + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence_assoc( + Parser const& parser , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr, mpl::true_ /*should_split*/) + { + Iterator save = first; + if (parser.left.parse( first, last, context, rcontext, attr) + && parser.right.parse(first, last, context, rcontext, attr)) + return true; + first = save; + return false; + } + + template <typename Parser, typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse_sequence( + Parser const& parser, Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr + , traits::associative_attribute) + { + // we can come here in 2 cases: + // - when sequence is key >> value and therefore must + // be parsed with tuple synthesized attribute and then + // that tuple is used to save into associative attribute provided here. + // Example: key >> value; + // + // - when either this->left or this->right provides full key-value + // pair (like in case 1) and another one provides nothing. + // Example: eps >> rule<class x; fusion::map<...> > + // + // first case must be parsed as whole, and second one should + // be parsed separately for left and right. + + typedef typename traits::attribute_of< + decltype(parser.left), Context>::type l_attr_type; + typedef typename traits::attribute_of< + decltype(parser.right), Context>::type r_attr_type; + + typedef typename + mpl::or_< + is_same<l_attr_type, unused_type> + , is_same<r_attr_type, unused_type> > + should_split; + + return parse_sequence_assoc(parser, first, last, context, rcontext, attr + , should_split()); + } + + template <typename Left, typename Right, typename Context, typename RContext> + struct parse_into_container_impl<sequence<Left, Right>, Context, RContext> + { + typedef sequence<Left, Right> parser_type; + + template <typename Iterator, typename Attribute> + static bool call( + parser_type const& parser + , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr, mpl::false_) + { + // inform user what went wrong if we jumped here in attempt to + // parse incompatible sequence into fusion::map + static_assert(!is_same< typename traits::attribute_category<Attribute>::type, + traits::associative_attribute>::value, + "To parse directly into fusion::map sequence must produce tuple attribute " + "where type of first element is existing key in fusion::map and second element " + "is value to be stored under that key"); + + Attribute attr_; + if (!parse_sequence(parser + , first, last, context, rcontext, attr_, traits::container_attribute())) + { + return false; + } + traits::append(attr, traits::begin(attr_), traits::end(attr_)); + return true; + } + + template <typename Iterator, typename Attribute> + static bool call( + parser_type const& parser + , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr, mpl::true_) + { + return parse_into_container_base_impl<parser_type>::call( + parser, first, last, context, rcontext, attr); + } + + template <typename Iterator, typename Attribute> + static bool call( + parser_type const& parser + , Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr) + { + typedef typename + traits::attribute_of<parser_type, Context>::type + attribute_type; + + typedef typename + traits::container_value<Attribute>::type + value_type; + + return call(parser, first, last, context, rcontext, attr + , typename traits::is_substitute<attribute_type, value_type>::type()); + } + }; + +}}}} + +#endif |