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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/url
//
#ifndef BOOST_URL_RFC_IMPL_PCT_ENCODED_RULE_HPP
#define BOOST_URL_RFC_IMPL_PCT_ENCODED_RULE_HPP
#include <boost/url/grammar/charset.hpp>
#include <boost/url/grammar/error.hpp>
#include <boost/url/grammar/hexdig_chars.hpp>
namespace boost {
namespace urls {
namespace detail {
template<class CharSet>
auto
parse_encoded(
char const*& it,
char const* end,
CharSet const& cs) noexcept ->
system::result<pct_string_view>
{
auto const start = it;
std::size_t n = 0;
char const* it0;
skip:
it0 = it;
it = grammar::find_if_not(
it0, end, cs);
n += it - it0;
if(it == end)
goto finish;
if(*it != '%')
goto finish;
for(;;)
{
++it;
if(it == end)
{
// expected HEXDIG
BOOST_URL_RETURN_EC(
grammar::error::invalid);
}
auto r = grammar::hexdig_value(*it);
if(r < 0)
{
// expected HEXDIG
BOOST_URL_RETURN_EC(
grammar::error::invalid);
}
++it;
if(it == end)
{
// expected HEXDIG
BOOST_URL_RETURN_EC(
grammar::error::invalid);
}
r = grammar::hexdig_value(*it);
if(r < 0)
{
// expected HEXDIG
BOOST_URL_RETURN_EC(
grammar::error::invalid);
}
++n;
++it;
if(it == end)
break;
if(*it != '%')
goto skip;
}
finish:
return make_pct_string_view_unsafe(
start, it - start, n);
}
} // detail
//------------------------------------------------
template<class CharSet>
auto
pct_encoded_rule_t<CharSet>::
parse(
char const*& it,
char const* end) const noexcept ->
system::result<value_type>
{
return detail::parse_encoded(
it, end, cs_);
}
} // urls
} // boost
#endif
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