121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Copyright (c) 2013 Agustin Berge
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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(BOOST_SPIRIT_X3_SKIP_JANUARY_26_2008_0422PM)
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#define BOOST_SPIRIT_X3_SKIP_JANUARY_26_2008_0422PM
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#include <boost/spirit/home/x3/support/context.hpp>
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#include <boost/spirit/home/x3/support/unused.hpp>
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#include <boost/spirit/home/x3/core/skip_over.hpp>
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#include <boost/spirit/home/x3/core/parser.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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template <typename Subject>
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struct reskip_directive : unary_parser<Subject, reskip_directive<Subject>>
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{
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typedef unary_parser<Subject, reskip_directive<Subject>> base_type;
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static bool const is_pass_through_unary = true;
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static bool const handles_container = Subject::handles_container;
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constexpr reskip_directive(Subject const& subject)
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: base_type(subject) {}
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template <typename Iterator, typename Context
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, typename RContext, typename Attribute>
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typename disable_if<has_skipper<Context>, bool>::type
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parse(Iterator& first, Iterator const& last
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, Context const& context, RContext& rcontext, Attribute& attr) const
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{
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auto const& skipper =
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detail::get_unused_skipper(x3::get<skipper_tag>(context));
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return this->subject.parse(
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first, last
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, make_context<skipper_tag>(skipper, context)
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, rcontext
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, attr);
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}
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template <typename Iterator, typename Context
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, typename RContext, typename Attribute>
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typename enable_if<has_skipper<Context>, bool>::type
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parse(Iterator& first, Iterator const& last
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, Context const& context, RContext& rcontext, Attribute& attr) const
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{
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return this->subject.parse(
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first, last
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, context
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, rcontext
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, attr);
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}
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};
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template <typename Subject, typename Skipper>
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struct skip_directive : unary_parser<Subject, skip_directive<Subject, Skipper>>
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{
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typedef unary_parser<Subject, skip_directive<Subject, Skipper>> base_type;
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static bool const is_pass_through_unary = true;
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static bool const handles_container = Subject::handles_container;
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constexpr skip_directive(Subject const& subject, Skipper const& skipper)
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: base_type(subject)
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, skipper(skipper)
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{}
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template <typename Iterator, typename Context
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, typename RContext, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, RContext& rcontext, Attribute& attr) const
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{
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return this->subject.parse(
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first, last
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, make_context<skipper_tag>(skipper, context)
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, rcontext
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, attr);
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}
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Skipper const skipper;
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};
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struct reskip_gen
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{
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template <typename Skipper>
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struct skip_gen
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{
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constexpr skip_gen(Skipper const& skipper)
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: skipper_(skipper) {}
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template <typename Subject>
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constexpr skip_directive<typename extension::as_parser<Subject>::value_type, Skipper>
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operator[](Subject const& subject) const
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{
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return { as_parser(subject), skipper_ };
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}
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Skipper skipper_;
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};
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template <typename Skipper>
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constexpr skip_gen<Skipper> const operator()(Skipper const& skipper) const
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{
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return { skipper };
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}
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template <typename Subject>
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constexpr reskip_directive<typename extension::as_parser<Subject>::value_type>
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operator[](Subject const& subject) const
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{
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return { as_parser(subject) };
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}
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};
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constexpr auto skip = reskip_gen{};
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}}}
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#endif
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