accept-encoding.hpp

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/*
 * RESTinio
 */

/*!
 * @file
 * @brief Stuff related to value of Accept-Encoding HTTP-field.
 *
 * @since v.0.6.2
 */

#pragma once

#include <restinio/helpers/http_field_parsers/basics.hpp>

namespace restinio
{

namespace http_field_parsers
{

//
// accept_encoding_value_t
//
/*!
 * @brief Tools for working with the value of Accept-Encoding HTTP-field.
 *
 * This struct represents parsed value of HTTP-field Accept-Encoding
 * (see https://tools.ietf.org/html/rfc7231#section-5.3.4):
@verbatim
Accept-Encoding  = #( codings [ weight ] )
codings          = content-coding / "identity" / "*"
content-coding   = token
@endverbatim
 *
 * @note
 * Values of `condings` are converted to lower case during the parsing.
 *
 * @since v.0.6.2
 */
struct accept_encoding_value_t
{
    struct item_t
    {
        std::string content_coding;
        qvalue_t weight{ qvalue_t::maximum };
    };

    using item_container_t = std::vector< item_t >;

    item_container_t codings;

    /*!
     * @brief A factory function for a parser of Accept-Encoding value.
     *
     * @since v.0.6.2
     */
    [[nodiscard]]
    static auto
    make_parser()
    {
        return produce< accept_encoding_value_t >(
            maybe_empty_comma_separated_list_p< item_container_t >(
                produce< item_t >(
                    token_p() >> to_lower() >> &item_t::content_coding,
                    maybe( weight_p() >> &item_t::weight )
                )
            ) >> &accept_encoding_value_t::codings
        );
    }

    /*!
     * @brief An attempt to parse Accept-Encoding HTTP-field.
     *
     * @since v.0.6.2
     */
    [[nodiscard]]
    static expected_t< accept_encoding_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 */