accept-language.hpp

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/*
 * RESTinio
 */

 
#pragma once
 
#include <restinio/helpers/http_field_parsers/basics.hpp>
 
namespace restinio
{
 
namespace http_field_parsers
{
 
namespace accept_language_details
{
 
namespace ep_impl = restinio::easy_parser::impl;
namespace hfp_impl = restinio::http_field_parsers::impl;
 
[[nodiscard]]
inline auto
make_language_tag_p()
{
    return produce<std::string>(
            repeat(1u, 8u, alpha_symbol_p() >> to_container()),
            repeat(0u, N,
                    symbol_p('-') >> to_container(),
                    repeat(1u, 8u, alphanum_symbol_p() >> to_container())
            )
    );
}
 
[[nodiscard]]
inline auto
make_language_range_p()
{
    return produce<std::string>(
            alternatives(
                    symbol_p('*') >> to_container(),
                    make_language_tag_p() >> as_result()
            )
    );
}
 
} /* namespace accept_language_details */
 
//
// accept_language_value_t
//
struct accept_language_value_t
{
    struct item_t
    {
        std::string language_range;
        qvalue_t weight{ qvalue_t::maximum };
    };
 
    using item_container_t = std::vector< item_t >;
 
    item_container_t languages;

    [[nodiscard]]
    static auto
    make_parser()
    {
        using namespace accept_language_details;
 
        return produce< accept_language_value_t >(
            non_empty_comma_separated_list_p< item_container_t >(
                produce< item_t >(
                    make_language_range_p() >> &item_t::language_range,
                    maybe( weight_p() >> &item_t::weight )
                )
            ) >> &accept_language_value_t::languages
        );
    }

    [[nodiscard]]
    static expected_t< accept_language_value_t, restinio::easy_parser::parse_error_t >
    try_parse( string_view_t what )
    {
        return restinio::easy_parser::try_parse( what, make_parser() );
    }
};
 
} /* namespace http_field_parsers */
 
} /* namespace restinio */