203 lines
7.0 KiB
C++
203 lines
7.0 KiB
C++
/*=============================================================================
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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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#ifndef BOOST_SPIRIT_QI_DIRECTIVE_SKIP_HPP
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#define BOOST_SPIRIT_QI_DIRECTIVE_SKIP_HPP
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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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#include <boost/utility/enable_if.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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typename enable_if<detail::is_unused_skipper<Skipper>, bool>::type
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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 Iterator, typename Context
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, typename Skipper, typename Attribute>
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typename disable_if<detail::is_unused_skipper<Skipper>, bool>::type
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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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return subject.parse(first, last, context
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, 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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};
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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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