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//
 
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
 
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// Copyright (c) 2023 Alan de Freitas (alandefreitas@gmail.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_IMPL_SCHEME_HPP
 
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#define BOOST_URL_IMPL_SCHEME_HPP
 
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#include <boost/url/detail/config.hpp>
 
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#include <boost/url/grammar/ci_string.hpp>
 
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namespace boost {
 
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namespace urls {
 
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inline BOOST_URL_CXX20_CONSTEXPR
 
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scheme
 
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string_to_scheme(
 
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    core::string_view s) noexcept
 
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{
 
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    using grammar::to_lower;
 
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    switch(s.size())
 
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    {
 
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    case 0: // none
 
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        return scheme::none;
 
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    case 2: // ws
 
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        if( to_lower(s[0]) == 'w' &&
 
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            to_lower(s[1]) == 's')
 
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            return scheme::ws;
 
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        break;
 
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    case 3:
 
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        switch(to_lower(s[0]))
 
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        {
 
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        case 'w': // wss
 
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            if( to_lower(s[1]) == 's' &&
 
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                to_lower(s[2]) == 's')
 
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                return scheme::wss;
 
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            break;
 
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        case 'f': // ftp
 
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            if( to_lower(s[1]) == 't' &&
 
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                to_lower(s[2]) == 'p')
 
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                return scheme::ftp;
 
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            break;
 
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        default:
 
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            break;
 
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        }
 
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        break;
 
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    case 4:
 
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        switch(to_lower(s[0]))
 
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        {
 
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        case 'f': // file
 
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            if( to_lower(s[1]) == 'i' &&
 
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                to_lower(s[2]) == 'l' &&
 
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                to_lower(s[3]) == 'e')
 
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                return scheme::file;
 
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            break;
 
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        case 'h': // http
 
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            if( to_lower(s[1]) == 't' &&
 
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                to_lower(s[2]) == 't' &&
 
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                to_lower(s[3]) == 'p')
 
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                return scheme::http;
 
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            break;
 
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        default:
 
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            break;
 
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        }
 
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        break;
 
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    case 5: // https
 
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        if( to_lower(s[0]) == 'h' &&
 
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            to_lower(s[1]) == 't' &&
 
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            to_lower(s[2]) == 't' &&
 
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            to_lower(s[3]) == 'p' &&
 
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            to_lower(s[4]) == 's')
 
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            return scheme::https;
 
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        break;
 
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    default:
 
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        break;
 
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    }
 
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    return scheme::unknown;
 
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}
 
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} // urls
 
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} // boost
 
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#endif