| /*============================================================================= |
| Copyright (c) 2001-2011 Joel de Guzman |
| Copyright (c) 2011-2012 Thomas Bernard |
| |
| 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_KEYWORDS_OR_MARCH_13_2007_1145PM) |
| #define SPIRIT_KEYWORDS_OR_MARCH_13_2007_1145PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/qi/domain.hpp> |
| #include <boost/spirit/home/qi/detail/permute_function.hpp> |
| #include <boost/spirit/home/qi/detail/attributes.hpp> |
| #include <boost/spirit/home/support/detail/what_function.hpp> |
| #include <boost/spirit/home/support/info.hpp> |
| #include <boost/spirit/home/support/unused.hpp> |
| #include <boost/fusion/include/iter_fold.hpp> |
| #include <boost/fusion/include/at.hpp> |
| #include <boost/fusion/include/value_at.hpp> |
| #include <boost/fusion/include/mpl.hpp> |
| #include <boost/optional.hpp> |
| #include <boost/foreach.hpp> |
| #include <boost/array.hpp> |
| #include <boost/spirit/home/qi/string/symbols.hpp> |
| #include <boost/spirit/home/qi/string/lit.hpp> |
| #include <boost/spirit/home/qi/action/action.hpp> |
| #include <boost/spirit/home/qi/directive/hold.hpp> |
| #include <boost/mpl/count_if.hpp> |
| #include <boost/mpl/range_c.hpp> |
| #include <boost/mpl/copy.hpp> |
| #include <boost/mpl/size.hpp> |
| #include <boost/mpl/equal_to.hpp> |
| #include <boost/mpl/back_inserter.hpp> |
| #include <boost/mpl/filter_view.hpp> |
| #include <boost/fusion/include/zip_view.hpp> |
| #include <boost/fusion/include/as_vector.hpp> |
| #include <boost/variant/static_visitor.hpp> |
| #include <boost/type_traits/remove_const.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| #include <boost/spirit/repository/home/qi/operator/detail/keywords.hpp> |
| #include <boost/fusion/include/any.hpp> |
| |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <> |
| struct use_operator<qi::domain, proto::tag::divides > // enables / |
| : mpl::true_ {}; |
| |
| template <> |
| struct flatten_tree<qi::domain, proto::tag::divides> // flattens / |
| : mpl::true_ {}; |
| }} |
| |
| namespace boost { namespace spirit { namespace repository { namespace qi |
| { |
| |
| // kwd directive parser type identification |
| namespace detail |
| { |
| BOOST_MPL_HAS_XXX_TRAIT_DEF(kwd_parser_id) |
| BOOST_MPL_HAS_XXX_TRAIT_DEF(complex_kwd_parser_id) |
| |
| |
| } |
| |
| // kwd directive type query |
| template <typename T> |
| struct is_kwd_parser : detail::has_kwd_parser_id<T> {}; |
| |
| template <typename Subject, typename Action> |
| struct is_kwd_parser<spirit::qi::action<Subject,Action> > : detail::has_kwd_parser_id<Subject> {}; |
| |
| template <typename Subject> |
| struct is_kwd_parser<spirit::qi::hold_directive<Subject> > : detail::has_kwd_parser_id<Subject> {}; |
| |
| template <typename T> |
| struct is_complex_kwd_parser : detail::has_complex_kwd_parser_id<T> {}; |
| |
| template <typename Subject, typename Action> |
| struct is_complex_kwd_parser<spirit::qi::action<Subject,Action> > : detail::has_complex_kwd_parser_id<Subject> {}; |
| |
| template <typename Subject> |
| struct is_complex_kwd_parser<spirit::qi::hold_directive<Subject> > : detail::has_complex_kwd_parser_id<Subject> {}; |
| |
| |
| // Keywords operator |
| template <typename Elements, typename Modifiers> |
| struct keywords : spirit::qi::nary_parser<keywords<Elements,Modifiers> > |
| { |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| // Put all the element attributes in a tuple |
| typedef typename traits::build_attribute_sequence< |
| Elements, Context, traits::sequence_attribute_transform, Iterator, spirit::qi::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; |
| }; |
| |
| /// Make sure that all subjects are of the kwd type |
| typedef typename mpl::count_if< |
| Elements, |
| mpl::not_< |
| mpl::or_< |
| is_kwd_parser< |
| mpl::_1 |
| > , |
| is_complex_kwd_parser< |
| mpl::_1 |
| > |
| > |
| > |
| > non_kwd_subject_count; |
| |
| /// If the assertion fails here then you probably forgot to wrap a |
| /// subject of the / operator in a kwd directive |
| BOOST_MPL_ASSERT_RELATION( non_kwd_subject_count::value, ==, 0 ); |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // build_parser_tags |
| // |
| // Builds a boost::variant from an mpl::range_c in order to "mark" every |
| // parser of the fusion sequence. The integer constant is used in the parser |
| // dispatcher functor in order to use the parser corresponding to the recognised |
| // keyword. |
| /////////////////////////////////////////////////////////////////////////// |
| |
| template <typename Sequence> |
| struct build_parser_tags |
| { |
| // Get the sequence size |
| typedef typename mpl::size< Sequence >::type sequence_size; |
| |
| // Create an integer_c constant for every parser in the sequence |
| typedef typename mpl::range_c<int, 0, sequence_size::value>::type int_range; |
| |
| // Transform the range_c to an mpl vector in order to be able to transform it into a variant |
| typedef typename mpl::copy<int_range, mpl::back_inserter<mpl::vector<> > >::type type; |
| |
| }; |
| // Build an index mpl vector |
| typedef typename build_parser_tags< Elements >::type parser_index_vector; |
| |
| template <typename idx> |
| struct is_complex_kwd_parser_filter : is_complex_kwd_parser< typename mpl::at<Elements, idx>::type > |
| {}; |
| |
| template <typename idx> |
| struct is_kwd_parser_filter : is_kwd_parser< typename mpl::at<Elements, idx>::type > |
| {}; |
| |
| // filter out the string kwd directives |
| typedef typename mpl::filter_view< Elements, is_kwd_parser<mpl::_> >::type string_keywords; |
| |
| typedef typename mpl::filter_view< parser_index_vector , |
| is_kwd_parser_filter< mpl::_ > |
| >::type string_keyword_indexes; |
| // filter out the complex keywords |
| typedef typename mpl::filter_view< parser_index_vector , |
| is_complex_kwd_parser_filter< mpl::_ > |
| >::type complex_keywords_indexes; |
| |
| //typedef typename fusion::filter_view< Elements, is_complex_kwd_parser< mpl::_ > > complex_keywords_view; |
| |
| typedef typename mpl::if_< |
| typename mpl::empty<complex_keywords_indexes>::type, |
| detail::empty_keywords_list, |
| detail::complex_keywords< complex_keywords_indexes > |
| >::type complex_keywords_type; |
| |
| // build a bool array and an integer array which will be used to |
| // check that the repetition constraints of the kwd parsers are |
| // met and bail out a soon as possible |
| typedef boost::array<bool, fusion::result_of::size<Elements>::value> flags_type; |
| typedef boost::array<int, fusion::result_of::size<Elements>::value> counters_type; |
| |
| typedef typename mpl::if_< |
| typename mpl::empty<string_keyword_indexes>::type, |
| detail::empty_keywords_list, |
| detail::string_keywords< |
| Elements, |
| string_keywords, |
| string_keyword_indexes, |
| flags_type, |
| Modifiers> |
| >::type string_keywords_type; |
| |
| keywords(Elements const& elements_) : |
| elements(elements_) |
| , string_keywords_inst(elements,flags_init) |
| , complex_keywords_inst(elements,flags_init) |
| { |
| } |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr_) const |
| { |
| // Select which parse function to call |
| // We need to handle the case where kwd / ikwd directives have been mixed |
| // This is where we decide which function should be called. |
| return parse_impl(first, last, context, skipper, attr_, |
| typename string_keywords_type::requires_one_pass() |
| ); |
| } |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse_impl(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr_,mpl::true_ /* one pass */) const |
| { |
| |
| // wrap the attribute in a tuple if it is not a tuple |
| typename traits::wrap_if_not_tuple<Attribute>::type attr(attr_); |
| |
| flags_type flags(flags_init); |
| //flags.assign(false); |
| |
| counters_type counters; |
| counters.assign(0); |
| |
| typedef repository::qi::detail::parse_dispatcher<Elements,Iterator, Context, Skipper |
| , flags_type, counters_type |
| , typename traits::wrap_if_not_tuple<Attribute>::type |
| , mpl::false_ > parser_visitor_type; |
| |
| parser_visitor_type parse_visitor(elements, first, last |
| , context, skipper, flags |
| , counters, attr); |
| |
| typedef repository::qi::detail::complex_kwd_function< parser_visitor_type > complex_kwd_function_type; |
| |
| complex_kwd_function_type |
| complex_function(first,last,context,skipper,parse_visitor); |
| |
| // We have a bool array 'flags' with one flag for each parser as well as a 'counter' |
| // array. |
| // The kwd directive sets and increments the counter when a successeful parse occured |
| // as well as the slot of the corresponding parser to true in the flags array as soon |
| // the minimum repetition requirement is met and keeps that value to true as long as |
| // the maximum repetition requirement is met. |
| // The parsing takes place here in two steps: |
| // 1) parse a keyword and fetch the parser index associated with that keyword |
| // 2) call the associated parser and store the parsed value in the matching attribute. |
| |
| while(true) |
| { |
| |
| spirit::qi::skip_over(first, last, skipper); |
| Iterator save = first; |
| if (string_keywords_inst.parse(first, last,parse_visitor,skipper)) |
| { |
| save = first; |
| } |
| else { |
| // restore the position to the last successful keyword parse |
| first = save; |
| if(!complex_keywords_inst.parse(complex_function)) |
| { |
| first = save; |
| // Check that we are leaving the keywords parser in a successfull state |
| BOOST_FOREACH(bool &valid,flags) |
| { |
| if(!valid) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| else |
| save = first; |
| } |
| } |
| return false; |
| } |
| |
| // Handle the mixed kwd and ikwd case |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse_impl(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr_,mpl::false_ /* two passes */) const |
| { |
| |
| // wrap the attribute in a tuple if it is not a tuple |
| typename traits::wrap_if_not_tuple<Attribute>::type attr(attr_); |
| |
| flags_type flags(flags_init); |
| //flags.assign(false); |
| |
| counters_type counters; |
| counters.assign(0); |
| |
| typedef detail::parse_dispatcher<Elements, Iterator, Context, Skipper |
| , flags_type, counters_type |
| , typename traits::wrap_if_not_tuple<Attribute>::type |
| , mpl::false_> parser_visitor_type; |
| |
| typedef detail::parse_dispatcher<Elements, Iterator, Context, Skipper |
| , flags_type, counters_type |
| , typename traits::wrap_if_not_tuple<Attribute>::type |
| , mpl::true_> no_case_parser_visitor_type; |
| |
| |
| parser_visitor_type parse_visitor(elements,first,last |
| ,context,skipper,flags,counters,attr); |
| no_case_parser_visitor_type no_case_parse_visitor(elements,first,last |
| ,context,skipper,flags,counters,attr); |
| |
| typedef repository::qi::detail::complex_kwd_function< parser_visitor_type > complex_kwd_function_type; |
| |
| complex_kwd_function_type |
| complex_function(first,last,context,skipper,parse_visitor); |
| |
| |
| // We have a bool array 'flags' with one flag for each parser as well as a 'counter' |
| // array. |
| // The kwd directive sets and increments the counter when a successeful parse occured |
| // as well as the slot of the corresponding parser to true in the flags array as soon |
| // the minimum repetition requirement is met and keeps that value to true as long as |
| // the maximum repetition requirement is met. |
| // The parsing takes place here in two steps: |
| // 1) parse a keyword and fetch the parser index associated with that keyword |
| // 2) call the associated parser and store the parsed value in the matching attribute. |
| |
| while(true) |
| { |
| spirit::qi::skip_over(first, last, skipper); |
| Iterator save = first; |
| // String keywords pass |
| if (string_keywords_inst.parse(first,last,parse_visitor,no_case_parse_visitor,skipper)) |
| { |
| save = first; |
| } |
| else { |
| first = save; |
| |
| if(!complex_keywords_inst.parse(complex_function)) |
| { |
| first = save; |
| // Check that we are leaving the keywords parser in a successfull state |
| BOOST_FOREACH(bool &valid,flags) |
| { |
| if(!valid) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| else |
| { |
| save = first; |
| } |
| } |
| } |
| return false; |
| } |
| |
| template <typename Context> |
| info what(Context& context) const |
| { |
| info result("keywords"); |
| fusion::for_each(elements, |
| spirit::detail::what_function<Context>(result, context)); |
| return result; |
| } |
| flags_type flags_init; |
| Elements elements; |
| string_keywords_type string_keywords_inst; |
| complex_keywords_type complex_keywords_inst; |
| |
| }; |
| }}}} |
| |
| namespace boost { namespace spirit { namespace qi { |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Elements, typename Modifiers > |
| struct make_composite<proto::tag::divides, Elements, Modifiers > |
| { |
| typedef repository::qi::keywords<Elements,Modifiers> result_type; |
| result_type operator()(Elements ref, unused_type) const |
| { |
| return result_type(ref); |
| } |
| }; |
| |
| |
| }}} |
| |
| namespace boost { namespace spirit { namespace traits |
| { |
| // We specialize this for keywords (see support/attributes.hpp). |
| // For keywords, we only wrap the attribute in a tuple IFF |
| // it is not already a fusion tuple. |
| template <typename Elements, typename Modifiers,typename Attribute> |
| struct pass_attribute<repository::qi::keywords<Elements,Modifiers>, Attribute> |
| : wrap_if_not_tuple<Attribute> {}; |
| |
| template <typename Elements, typename Modifiers> |
| struct has_semantic_action<repository::qi::keywords<Elements, Modifiers> > |
| : nary_has_semantic_action<Elements> {}; |
| |
| template <typename Elements, typename Attribute, typename Context |
| , typename Iterator, typename Modifiers> |
| struct handles_container<repository::qi::keywords<Elements,Modifiers>, Attribute |
| , Context, Iterator> |
| : nary_handles_container<Elements, Attribute, Context, Iterator> {}; |
| |
| |
| }}} |
| |
| #endif |
| |
