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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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#include <boost/url/detail/config.hpp>
 
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#include <boost/url/rfc/query_rule.hpp>
 
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#include "detail/charsets.hpp"
 
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#include <boost/url/error.hpp>
 
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#include <boost/url/grammar/hexdig_chars.hpp>
 
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namespace boost {
 
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namespace urls {
 
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auto
 
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implementation_defined::query_rule_t::
 
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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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    {
 
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        // empty string = 1 param
 
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        core::string_view str(it, 0);
 
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        return params_encoded_view(
 
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            detail::query_ref(str, 0, 1));
 
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    }
 
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    auto const it0 = it;
 
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    std::size_t dn = 0;
 
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    std::size_t nparam = 1;
 
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    while(it != end)
 
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    {
 
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        if(*it == '&')
 
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        {
 
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            ++nparam;
 
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            ++it;
 
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            continue;
 
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        }
 
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        if(detail::query_chars(*it))
 
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        {
 
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            ++it;
 
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            continue;
 
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        }
 
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        if(*it == '%')
 
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        {
 
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            if(end - it < 3 ||
 
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                (!grammar::hexdig_chars(it[1]) ||
 
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                 !grammar::hexdig_chars(it[2])))
 
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            {
 
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                // missing valid HEXDIG
 
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                break;
 
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            }
 
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            it += 3;
 
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            dn += 2;
 
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            continue;
 
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        }
 
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        // got reserved character
 
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        break;
 
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    }
 
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    std::size_t const n(it - it0);
 
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    core::string_view str(it0, n);
 
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    return params_encoded_view(
 
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        detail::query_ref(
 
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            str, n - dn, nparam));
 
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}
 
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} // urls
 
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} // boost
 
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