| /*============================================================================= |
| Copyright (c) 2001-2010 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_KLEENE_JANUARY_07_2007_0818AM) |
| #define SPIRIT_KLEENE_JANUARY_07_2007_0818AM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/qi/parser.hpp> |
| #include <boost/spirit/home/support/container.hpp> |
| #include <boost/spirit/home/qi/detail/attributes.hpp> |
| #include <boost/spirit/home/support/info.hpp> |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| //[composite_parsers_kleene_enable_ |
| template <> |
| struct use_operator<qi::domain, proto::tag::dereference> // enables *p |
| : mpl::true_ {}; |
| //] |
| }} |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| |
| //[composite_parsers_kleene |
| template <typename Subject> |
| struct kleene : unary_parser<kleene<Subject> > |
| { |
| typedef Subject subject_type; |
| |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| // Build a std::vector from the subject's attribute. Note |
| // that build_std_vector may return unused_type if the |
| // subject's attribute is an unused_type. |
| typedef typename |
| traits::build_std_vector< |
| typename traits:: |
| attribute_of<Subject, Context, Iterator>::type |
| >::type |
| type; |
| }; |
| |
| kleene(Subject const& subject) |
| : subject(subject) {} |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr) const |
| { |
| // create a local value if Attribute is not unused_type |
| typedef typename traits::container_value<Attribute>::type |
| value_type; |
| value_type val = value_type(); |
| |
| // Repeat while subject parses ok |
| Iterator save = first; |
| while (subject.parse(save, last, context, skipper, val) && |
| traits::push_back(attr, val)) // push the parsed value into our attribute |
| { |
| first = save; |
| traits::clear(val); |
| } |
| return true; |
| } |
| |
| template <typename Context> |
| info what(Context& context) const |
| { |
| return info("kleene", subject.what(context)); |
| } |
| |
| Subject subject; |
| }; |
| //] |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| //[composite_parsers_kleene_generator |
| template <typename Elements, typename Modifiers> |
| struct make_composite<proto::tag::dereference, Elements, Modifiers> |
| : make_unary_composite<Elements, kleene> |
| {}; |
| //] |
| |
| // /////////////////////////////////////////////////////////////////////////// |
| // // Define what attributes are compatible with a kleene |
| // template <typename Attribute, typename Subject, typename Context, typename Iterator> |
| // struct is_attribute_compatible<Attribute, kleene<Subject>, Context, Iterator> |
| // : traits::is_container_compatible<qi::domain, Attribute |
| // , kleene<Subject>, Context, Iterator> |
| // {}; |
| }}} |
| |
| namespace boost { namespace spirit { namespace traits |
| { |
| template <typename Subject> |
| struct has_semantic_action<qi::kleene<Subject> > |
| : unary_has_semantic_action<Subject> {}; |
| }}} |
| |
| #endif |