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//
 
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@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_DETAIL_PATH_HPP
 
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#define BOOST_URL_DETAIL_PATH_HPP
 
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#include <boost/core/detail/string_view.hpp>
 
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namespace boost {
 
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namespace urls {
 
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namespace detail {
 
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// Return the number of characters at
 
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// the front of the path that are reserved
 
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inline
 
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std::size_t
 
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path_prefix(
 
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    char const* p,
 
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    std::size_t n) noexcept
 
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{
 
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    switch(n)
 
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    {
 
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    case 0:
 
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        return 0;
 
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    case 1:
 
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        if(p[0] == '/')
 
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            return 1;
 
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        return 0;
 
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    case 2:
 
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        if(p[0] == '/')
 
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            return 1;
 
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        if( p[0] == '.' &&
 
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            p[1] == '/')
 
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            return 2;
 
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        return 0;
 
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    default:
 
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        if(p[0] == '/')
 
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        {
 
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            if( p[1] == '.' &&
 
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                p[2] == '/')
 
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                return 3;
 
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            return 1;
 
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        }
 
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        if( p[0] == '.' &&
 
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            p[1] == '/')
 
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            return 2;
 
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        break;
 
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    }
 
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    return 0;
 
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}
 
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// VFALCO DEPRECATED
 
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inline
 
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std::size_t
 
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path_prefix(
 
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    core::string_view s) noexcept
 
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{
 
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    return path_prefix(
 
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        s.data(), s.size());
 
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}
 
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// returns the number of adjusted
 
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// segments based on the malleable prefix.
 
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inline
 
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std::size_t
 
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path_segments(
 
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    core::string_view s,
 
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    std::size_t nseg) noexcept
 
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{
 
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    switch(s.size())
 
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    {
 
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    case 0:
 
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        BOOST_ASSERT(nseg == 0);
 
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        return 0;
 
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    case 1:
 
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        BOOST_ASSERT(nseg == 1);
 
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        if(s[0] == '/')
 
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            return 0;
 
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        return 1;
 
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    case 2:
 
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        if(s[0] == '/')
 
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            return nseg;
 
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        if( s[0] == '.' &&
 
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            s[1] == '/')
 
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        {
 
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            BOOST_ASSERT(nseg > 1);
 
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            return nseg - 1;
 
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        }
 
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        return nseg;
 
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    default:
 
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        if(s[0] == '/')
 
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        {
 
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            if( s[1] == '.' &&
 
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                s[2] == '/')
 
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            {
 
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                BOOST_ASSERT(nseg > 1);
 
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                return nseg - 1;
 
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            }
 
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            return nseg;
 
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        }
 
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        if( s[0] == '.' &&
 
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            s[1] == '/')
 
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        {
 
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            BOOST_ASSERT(nseg > 1);
 
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            return nseg - 1;
 
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        }
 
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        break;
 
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    }
 
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    return nseg;
 
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}
 
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// Trim reserved characters from
 
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// the front of the path.
 
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inline
 
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core::string_view
 
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clean_path(
 
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    core::string_view s) noexcept
 
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{
 
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    s.remove_prefix(
 
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        path_prefix(s));
 
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    return s;
 
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}
 
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} // detail
 
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} // urls
 
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} // boost
 
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#endif