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//
 
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
 
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//
 
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
 
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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//
 
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// Official repository: https://github.com/boostorg/url
 
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//
 
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#ifndef BOOST_URL_RFC_DETAIL_QUERY_PART_RULE_HPP
 
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#define BOOST_URL_RFC_DETAIL_QUERY_PART_RULE_HPP
 
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#include "boost/url/detail/config.hpp"
 
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#include "boost/url/error_types.hpp"
 
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#include "boost/url/pct_string_view.hpp"
 
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#include "boost/url/rfc/query_rule.hpp"
 
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#include "boost/url/grammar/parse.hpp"
 
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#include <cstdlib>
 
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namespace boost {
 
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namespace urls {
 
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namespace detail {
 
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/** Rule for query-part
 
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    @par BNF
 
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    @code
 
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    query-part    = [ "?" query ]
 
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    @endcode
 
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*/
 
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struct query_part_rule_t
 
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{
 
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    struct value_type
 
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    {
 
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        pct_string_view query;
 
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        std::size_t count = 0;
 
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        bool has_query = false;
 
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    };
 
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    auto
 
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    parse(
 
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        char const*& it,
 
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        char const* end
 
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            ) const noexcept ->
 
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        system::result<value_type>
 
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    {
 
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        if( it == end ||
 
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            *it != '?')
 
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            return {};
 
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        ++it;
 
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        auto rv = grammar::parse(
 
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            it, end, query_rule);
 
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        // query_rule is optionally empty and must not fail
 
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        BOOST_ASSERT( rv );
 
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        value_type t;
 
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        t.query = rv->buffer();
 
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        t.count = rv->size();
 
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        // a query_rule represents at least one parameter:
 
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        // <empty key, no value>
 
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        BOOST_ASSERT( t.count );
 
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        t.has_query = true;
 
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        return t;
 
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    }
 
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};
 
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constexpr query_part_rule_t query_part_rule{};
 
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} // detail
 
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} // urls
 
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} // boost
 
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#endif