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134 lines
4.6 KiB
134 lines
4.6 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Copyright (c) 2001-2011 Hartmut Kaiser |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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=============================================================================*/ |
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#if !defined(SPIRIT_KLEENE_JANUARY_07_2007_0818AM) |
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#define SPIRIT_KLEENE_JANUARY_07_2007_0818AM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/parser.hpp> |
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#include <boost/spirit/home/support/container.hpp> |
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#include <boost/spirit/home/qi/detail/attributes.hpp> |
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#include <boost/spirit/home/qi/detail/fail_function.hpp> |
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#include <boost/spirit/home/qi/detail/pass_container.hpp> |
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#include <boost/spirit/home/support/has_semantic_action.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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namespace boost { namespace spirit |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// Enablers |
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/////////////////////////////////////////////////////////////////////////// |
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//[composite_parsers_kleene_enable_ |
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template <> |
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struct use_operator<qi::domain, proto::tag::dereference> // enables *p |
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: mpl::true_ {}; |
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//] |
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}} |
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namespace boost { namespace spirit { namespace qi |
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{ |
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//[composite_parsers_kleene |
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template <typename Subject> |
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struct kleene : unary_parser<kleene<Subject> > |
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{ |
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typedef Subject subject_type; |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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// Build a std::vector from the subject's attribute. Note |
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// that build_std_vector may return unused_type if the |
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// subject's attribute is an unused_type. |
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typedef typename |
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traits::build_std_vector< |
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typename traits:: |
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attribute_of<Subject, Context, Iterator>::type |
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>::type |
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type; |
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}; |
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kleene(Subject const& subject) |
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: subject(subject) {} |
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template <typename F> |
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bool parse_container(F f) const |
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{ |
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while (!f (subject)) |
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; |
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return true; |
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} |
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template <typename Iterator, typename Context |
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, typename Skipper, typename Attribute> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper |
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, Attribute& attr) const |
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{ |
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// ensure the attribute is actually a container type |
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traits::make_container(attr); |
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typedef detail::fail_function<Iterator, Context, Skipper> |
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fail_function; |
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Iterator iter = first; |
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fail_function f(iter, last, context, skipper); |
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parse_container(detail::make_pass_container(f, attr)); |
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first = f.first; |
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return true; |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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return info("kleene", subject.what(context)); |
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} |
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Subject subject; |
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}; |
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//] |
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/////////////////////////////////////////////////////////////////////////// |
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// Parser generators: make_xxx function (objects) |
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/////////////////////////////////////////////////////////////////////////// |
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//[composite_parsers_kleene_generator |
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template <typename Elements, typename Modifiers> |
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struct make_composite<proto::tag::dereference, Elements, Modifiers> |
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: make_unary_composite<Elements, kleene> |
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{}; |
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//] |
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// /////////////////////////////////////////////////////////////////////////// |
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// // Define what attributes are compatible with a kleene |
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// template <typename Attribute, typename Subject, typename Context, typename Iterator> |
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// struct is_attribute_compatible<Attribute, kleene<Subject>, Context, Iterator> |
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// : traits::is_container_compatible<qi::domain, Attribute |
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// , kleene<Subject>, Context, Iterator> |
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// {}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject> |
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struct has_semantic_action<qi::kleene<Subject> > |
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: unary_has_semantic_action<Subject> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<qi::kleene<Subject>, Attribute |
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, Context, Iterator> |
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: mpl::true_ {}; |
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}}} |
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#endif
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