/*=============================================================================
    Copyright (c) 2011 Jamboree
    Copyright (c) 2014 Lee Clagett

    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)
==============================================================================*/
#if !defined(BOOST_SPIRIT_X3_SEEK_APRIL_13_2014_1920PM)
#define BOOST_SPIRIT_X3_SEEK_APRIL_13_2014_1920PM

#include <boost/spirit/home/x3/core/parser.hpp>

namespace boost {
namespace spirit {
namespace x3 {
template<typename Subject>
struct seek_directive : unary_parser<Subject, seek_directive<Subject>>
{
    typedef unary_parser<Subject, seek_directive<Subject>> base_type;
    static bool const is_pass_through_unary = true;
    static bool const handles_container = Subject::handles_container;

    constexpr
    seek_directive(Subject const& subject) :
        base_type(subject) {}

    template<typename Iterator, typename Context
             , typename RContext, typename Attribute>
    bool
    parse(
        Iterator& first, Iterator const& last
        , Context const& context, RContext& rcontext, Attribute& attr) const
    {
        for (Iterator current(first);; ++current)
        {
            if (this->subject.parse(current, last, context, rcontext, attr))
            {
                first = current;
                return true;
            }

            // fail only after subject fails & no input
            if (current == last)
            {
                return false;
            }
        }
    }
};

struct seek_gen
{
    template<typename Subject>
    constexpr seek_directive<typename extension::as_parser<Subject>::value_type>
    operator[](Subject const& subject) const
    {
        return { as_parser(subject) };
    }
};

constexpr auto seek = seek_gen{};
}
}
}

#endif
