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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_GRAMMAR_IMPL_VARIANT_RULE_HPP | ||
| 11 | #define BOOST_URL_GRAMMAR_IMPL_VARIANT_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/url/grammar/error.hpp> | ||
| 14 | #include <boost/url/grammar/parse.hpp> | ||
| 15 | #include <boost/core/detail/static_assert.hpp> | ||
| 16 | #include <cstdint> | ||
| 17 | #include <type_traits> | ||
| 18 | |||
| 19 | namespace boost { | ||
| 20 | namespace urls { | ||
| 21 | namespace grammar { | ||
| 22 | |||
| 23 | namespace detail { | ||
| 24 | |||
| 25 | // must come first | ||
| 26 | template< | ||
| 27 | class R0, | ||
| 28 | class... Rn, | ||
| 29 | std::size_t I> | ||
| 30 | auto | ||
| 31 | 1139 | parse_variant( | |
| 32 | char const*&, | ||
| 33 | char const*, | ||
| 34 | detail::tuple< | ||
| 35 | R0, Rn...> const&, | ||
| 36 | std::integral_constant< | ||
| 37 | std::size_t, I> const&, | ||
| 38 | std::false_type const&) -> | ||
| 39 | system::result<variant2::variant< | ||
| 40 | typename R0::value_type, | ||
| 41 | typename Rn::value_type...>> | ||
| 42 | { | ||
| 43 | // no match | ||
| 44 | 1139 | BOOST_URL_RETURN_EC( | |
| 45 | error::mismatch); | ||
| 46 | } | ||
| 47 | |||
| 48 | template< | ||
| 49 | class R0, | ||
| 50 | class... Rn, | ||
| 51 | std::size_t I> | ||
| 52 | auto | ||
| 53 | 11370 | parse_variant( | |
| 54 | char const*& it, | ||
| 55 | char const* const end, | ||
| 56 | detail::tuple< | ||
| 57 | R0, Rn...> const& rn, | ||
| 58 | std::integral_constant< | ||
| 59 | std::size_t, I> const&, | ||
| 60 | std::true_type const&) -> | ||
| 61 | system::result<variant2::variant< | ||
| 62 | typename R0::value_type, | ||
| 63 | typename Rn::value_type...>> | ||
| 64 | { | ||
| 65 | 11370 | auto const it0 = it; | |
| 66 |
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11370 | auto rv = parse( |
| 67 | it, end, get<I>(rn)); | ||
| 68 |
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11370 | if( rv ) |
| 69 | return variant2::variant< | ||
| 70 | typename R0::value_type, | ||
| 71 | typename Rn::value_type...>{ | ||
| 72 |
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5946 | variant2::in_place_index_t<I>{}, *rv}; |
| 73 | 5424 | it = it0; | |
| 74 |
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2564 | return parse_variant( |
| 75 | it, end, rn, | ||
| 76 | std::integral_constant< | ||
| 77 | std::size_t, I+1>{}, | ||
| 78 | std::integral_constant<bool, | ||
| 79 | ((I + 1) < (1 + | ||
| 80 |
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5424 | sizeof...(Rn)))>{}); |
| 81 | 864 | } | |
| 82 | |||
| 83 | } // detail | ||
| 84 | |||
| 85 | template<class R0, class... Rn> | ||
| 86 | auto | ||
| 87 | 3711 | implementation_defined::variant_rule_t<R0, Rn...>:: | |
| 88 | parse( | ||
| 89 | char const*& it, | ||
| 90 | char const* end) const -> | ||
| 91 | system::result<value_type> | ||
| 92 | { | ||
| 93 | 728 | return detail::parse_variant( | |
| 94 |
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3711 | it, end, rn_, |
| 95 | std::integral_constant< | ||
| 96 | std::size_t, 0>{}, | ||
| 97 |
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4439 | std::true_type{}); |
| 98 | } | ||
| 99 | |||
| 100 | //------------------------------------------------ | ||
| 101 | |||
| 102 | template<BOOST_URL_CONSTRAINT(Rule) R0, BOOST_URL_CONSTRAINT(Rule)... Rn> | ||
| 103 | auto | ||
| 104 | constexpr | ||
| 105 | 2515 | variant_rule( | |
| 106 | R0 const& r0, | ||
| 107 | Rn const&... rn) noexcept -> | ||
| 108 | implementation_defined::variant_rule_t<R0, Rn...> | ||
| 109 | { | ||
| 110 | BOOST_CORE_STATIC_ASSERT( | ||
| 111 | mp11::mp_all< | ||
| 112 | is_rule<R0>, | ||
| 113 | is_rule<Rn>...>::value); | ||
| 114 | 2515 | return { r0, rn... }; | |
| 115 | } | ||
| 116 | |||
| 117 | } // grammar | ||
| 118 | } // urls | ||
| 119 | } // boost | ||
| 120 | |||
| 121 | #endif | ||
| 122 |