boost/boost/spirit/home/x3/operator/list.hpp

/*=============================================================================
    Copyright (c) 2001-2014 Joel de Guzman
    Copyright (c) 2001-2011 Hartmut Kaiser

    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(SPIRIT_LIST_MARCH_24_2007_1031AM)
#define SPIRIT_LIST_MARCH_24_2007_1031AM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/spirit/home/x3/core/parser.hpp>
#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
#include <boost/spirit/home/x3/support/traits/attribute_of.hpp>
#include <boost/spirit/home/x3/core/detail/parse_into_container.hpp>

namespace boost { namespace spirit { namespace x3
{
    template <typename Left, typename Right>
    struct list : binary_parser<Left, Right, list<Left, Right>>
    {
        typedef binary_parser<Left, Right, list<Left, Right>> base_type;
        static bool const handles_container = true;
        static bool const has_attribute = true;

        list(Left const& left, Right const& right)
          : base_type(left, right) {}

        template <typename Iterator, typename Context
          , typename RContext, typename Attribute>
        bool parse(Iterator& first, Iterator const& last
          , Context const& context, RContext& rcontext, Attribute& attr) const
        {
            // in order to succeed we need to match at least one element
            if (!detail::parse_into_container(
                this->left, first, last, context, rcontext, attr))
                return false;

            Iterator save = first;
            while (this->right.parse(first, last, context, rcontext, unused)
                && detail::parse_into_container(
                    this->left, first, last, context, rcontext, attr))
            {
                save = first;
            }

            first = save;
            return true;
        }
    };

    template <typename Left, typename Right>
    inline list<
        typename extension::as_parser<Left>::value_type
      , typename extension::as_parser<Right>::value_type>
    operator%(Left const& left, Right const& right)
    {
        return {as_parser(left), as_parser(right)};
    }
}}}

namespace boost { namespace spirit { namespace x3 { namespace traits
{
    template <typename Left, typename Right, typename Context>
    struct attribute_of<x3::list<Left, Right>, Context>
        : traits::build_container<
            typename attribute_of<Left, Context>::type> {};
}}}}

#endif