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- /*=============================================================================
- Copyright (c) 2011 Jamboree
- 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)
- =============================================================================*/
- #ifndef BOOST_SPIRIT_REPOSITORY_QI_SEEK
- #define BOOST_SPIRIT_REPOSITORY_QI_SEEK
- #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/qi/detail/attributes.hpp>
- #include <boost/spirit/home/support/info.hpp>
- #include <boost/spirit/home/support/unused.hpp>
- #include <boost/spirit/home/support/has_semantic_action.hpp>
- #include <boost/spirit/home/support/handles_container.hpp>
- #include <boost/spirit/repository/home/support/seek.hpp>
- namespace boost { namespace spirit
- {
- ///////////////////////////////////////////////////////////////////////////
- // Enablers
- ///////////////////////////////////////////////////////////////////////////
- // enables seek[...]
- template <>
- struct use_directive<qi::domain, repository::tag::seek>
- : mpl::true_ {};
- }} // namespace boost::spirit
- namespace boost { namespace spirit { namespace repository {namespace qi
- {
- #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
- using repository::seek;
- #endif
- using repository::seek_type;
- template <typename Subject>
- struct seek_directive
- : spirit::qi::unary_parser<seek_directive<Subject> >
- {
- typedef Subject subject_type;
- template <typename Context, typename Iterator>
- struct attribute
- {
- typedef typename
- traits::attribute_of<subject_type, Context, Iterator>::type
- type;
- };
- seek_directive(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
- {
- for (Iterator it(first); ; ++it)
- {
- if (subject.parse(it, last, context, skipper, attr))
- {
- first = it;
- return true;
- }
- // fail only after subject fails & no input
- if (it == last)
- return false;
- }
- }
- template <typename Context>
- info what(Context& context) const
- {
- return info("seek", subject.what(context));
- }
- Subject subject;
- };
- }}}} // namespace boost::spirit::repository::qi
- namespace boost { namespace spirit { namespace qi
- {
- ///////////////////////////////////////////////////////////////////////////
- // Parser generators: make_xxx function (objects)
- ///////////////////////////////////////////////////////////////////////////
- template <typename Subject, typename Modifiers>
- struct make_directive<repository::tag::seek, Subject, Modifiers>
- {
- typedef repository::qi::seek_directive<Subject> result_type;
- result_type operator()(unused_type, Subject const& subject, unused_type) const
- {
- return result_type(subject);
- }
- };
- }}} // namespace boost::spirit::qi
- namespace boost { namespace spirit { namespace traits
- {
- ///////////////////////////////////////////////////////////////////////////
- template <typename Subject>
- struct has_semantic_action<repository::qi::seek_directive<Subject> >
- : unary_has_semantic_action<Subject> {};
- ///////////////////////////////////////////////////////////////////////////
- template <typename Subject, typename Attribute, typename Context
- , typename Iterator>
- struct handles_container<repository::qi::seek_directive<Subject>, Attribute
- , Context, Iterator>
- : unary_handles_container<Subject, Attribute, Context, Iterator> {};
- }}} // namespace boost::spirit::traits
- #endif
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