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190 lines
6.5 KiB
190 lines
6.5 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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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_SKIP_JANUARY_26_2008_0422PM) |
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#define SPIRIT_SKIP_JANUARY_26_2008_0422PM |
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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/qi/auxiliary/lazy.hpp> |
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#include <boost/spirit/home/qi/operator/kleene.hpp> |
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#include <boost/spirit/home/qi/directive/lexeme.hpp> |
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#include <boost/spirit/home/qi/skip_over.hpp> |
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#include <boost/spirit/home/qi/detail/unused_skipper.hpp> |
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#include <boost/spirit/home/support/container.hpp> |
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#include <boost/spirit/home/support/common_terminals.hpp> |
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#include <boost/spirit/home/qi/detail/attributes.hpp> |
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#include <boost/spirit/home/support/info.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/fusion/include/at.hpp> |
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#include <boost/fusion/include/vector.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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template <> |
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struct use_directive<qi::domain, tag::skip> // enables skip[p] |
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: mpl::true_ {}; |
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template <typename T> |
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struct use_directive<qi::domain |
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, terminal_ex<tag::skip // enables skip(s)[p] |
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, fusion::vector1<T> > |
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> : boost::spirit::traits::matches<qi::domain, T> {}; |
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template <> // enables *lazy* skip(s)[p] |
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struct use_lazy_directive< |
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qi::domain |
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, tag::skip |
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, 1 // arity |
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> : mpl::true_ {}; |
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}} |
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namespace boost { namespace spirit { namespace qi |
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{ |
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
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using spirit::skip; |
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#endif |
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using spirit::skip_type; |
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template <typename Subject> |
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struct reskip_parser : unary_parser<reskip_parser<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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typedef typename |
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traits::attribute_of<Subject, Context, Iterator>::type |
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type; |
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}; |
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reskip_parser(Subject const& subject) |
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: subject(subject) {} |
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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& u // --> The skipper is reintroduced |
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, Attribute& attr) const |
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{ |
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return subject.parse(first, last, context |
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, detail::get_skipper(u), attr); |
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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("skip", subject.what(context)); |
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} |
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Subject subject; |
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}; |
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template <typename Subject, typename Skipper> |
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struct skip_parser : unary_parser<skip_parser<Subject, Skipper> > |
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{ |
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typedef Subject subject_type; |
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typedef Skipper skipper_type; |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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typedef typename |
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traits::attribute_of<Subject, Context, Iterator>::type |
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type; |
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}; |
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skip_parser(Subject const& subject, Skipper const& skipper) |
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: subject(subject), skipper(skipper) {} |
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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 --> bypass the supplied skipper |
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, Attribute& attr) const |
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{ |
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return subject.parse(first, last, context, skipper, attr); |
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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("skip", subject.what(context)); |
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} |
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Subject subject; |
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Skipper skipper; |
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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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template <typename Subject, typename Modifiers> |
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struct make_directive<tag::skip, Subject, Modifiers> |
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{ |
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typedef reskip_parser<Subject> result_type; |
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result_type operator()(unused_type, Subject const& subject, unused_type) const |
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{ |
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return result_type(subject); |
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} |
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}; |
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template <typename Skipper, typename Subject, typename Modifiers> |
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struct make_directive< |
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terminal_ex<tag::skip, fusion::vector1<Skipper> >, Subject, Modifiers> |
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{ |
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typedef typename |
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result_of::compile<qi::domain, Skipper, Modifiers>::type |
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skipper_type; |
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typedef skip_parser<Subject, skipper_type> result_type; |
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template <typename Terminal> |
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result_type operator()(Terminal const& term, Subject const& subject |
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, Modifiers const& modifiers) const |
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{ |
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return result_type(subject |
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, compile<qi::domain>(fusion::at_c<0>(term.args), modifiers)); |
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} |
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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::reskip_parser<Subject> > |
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: unary_has_semantic_action<Subject> {}; |
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template <typename Subject, typename Skipper> |
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struct has_semantic_action<qi::skip_parser<Subject, Skipper> > |
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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::reskip_parser<Subject>, Attribute |
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, Context, Iterator> |
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: unary_handles_container<Subject, Attribute, Context, Iterator> {}; |
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template <typename Subject, typename Skipper, typename Attribute |
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, typename Context, typename Iterator> |
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struct handles_container<qi::skip_parser<Subject, Skipper>, Attribute |
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, Context, Iterator> |
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: unary_handles_container<Subject, Attribute, Context, Iterator> {}; |
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}}} |
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#endif
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