include/boost/url/rfc/impl/uri_reference_rule.hpp

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include/boost/url/rfc/impl/uri_reference_rule.hpp
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1 //
2 // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
3 // Copyright (c) 2023 Alan de Freitas (alandefreitas@gmail.com)
4 //
5 // Distributed under the Boost Software License, Version 1.0. (See accompanying
6 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 //
8 // Official repository: https://github.com/boostorg/url
9 //
10
11 #ifndef BOOST_URL_RFC_IMPL_URI_REFERENCE_RULE_HPP
12 #define BOOST_URL_RFC_IMPL_URI_REFERENCE_RULE_HPP
13
14 #include <boost/url/detail/config.hpp>
15 #include <boost/url/url_view.hpp>
16 #include <boost/url/rfc/uri_rule.hpp>
17 #include <boost/url/rfc/relative_ref_rule.hpp>
18 #include <boost/url/grammar/error.hpp>
19 #include <boost/url/grammar/parse.hpp>
20
21 namespace boost {
22 namespace urls {
23
24 BOOST_URL_CXX20_CONSTEXPR_OR_INLINE
25 auto
26 12721 implementation_defined::uri_reference_rule_t::
27 parse(
28 char const*& it,
29 char const* const end
30 ) const noexcept ->
31 system::result<value_type>
32 {
33 // Try URI first, then relative-ref.
34 // Use separate variables for each parse attempt
35 // to avoid variant2 cross-alternative reassignment,
36 // which uses placement new (not constexpr before C++26).
37 12721 auto const it0 = it;
38 12721 auto rv1 = grammar::parse(
39 it, end, uri_rule);
40 12721 if(rv1)
41 2822 return *rv1;
42 9899 it = it0;
43 9899 auto rv2 = grammar::parse(
44 it, end, relative_ref_rule);
45 9899 if(rv2)
46 9541 return *rv2;
47 358 BOOST_URL_CONSTEXPR_RETURN_EC(
48 grammar::error::mismatch);
49 }
50
51 } // urls
52 } // boost
53
54
55 #endif
56