| Line | Branch | Exec | Source |
|---|---|---|---|
| 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_VARIANT_RULE_HPP | ||
| 11 | #define BOOST_URL_GRAMMAR_VARIANT_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/config.hpp> | ||
| 14 | #include <boost/url/error_types.hpp> | ||
| 15 | #include <boost/url/variant.hpp> | ||
| 16 | #include <boost/url/grammar/detail/tuple.hpp> | ||
| 17 | |||
| 18 | namespace boost { | ||
| 19 | namespace urls { | ||
| 20 | namespace grammar { | ||
| 21 | |||
| 22 | /** Match one of a set of rules | ||
| 23 | |||
| 24 | Each specified rule is tried in sequence. | ||
| 25 | When the first match occurs, the result | ||
| 26 | is stored and returned in the variant. If | ||
| 27 | no match occurs, an error is returned. | ||
| 28 | |||
| 29 | @par Value Type | ||
| 30 | @code | ||
| 31 | using value_type = variant< typename Rules::value_type... >; | ||
| 32 | @endcode | ||
| 33 | |||
| 34 | @par Example | ||
| 35 | Rules are used with the function @ref parse. | ||
| 36 | @code | ||
| 37 | // request-target = origin-form | ||
| 38 | // / absolute-form | ||
| 39 | // / authority-form | ||
| 40 | // / asterisk-form | ||
| 41 | |||
| 42 | system::result< variant< url_view, url_view, authority_view, core::string_view > > rv = grammar::parse( | ||
| 43 | "/index.html?width=full", | ||
| 44 | variant_rule( | ||
| 45 | origin_form_rule, | ||
| 46 | absolute_uri_rule, | ||
| 47 | authority_rule, | ||
| 48 | delim_rule('*') ) ); | ||
| 49 | @endcode | ||
| 50 | |||
| 51 | @par BNF | ||
| 52 | @code | ||
| 53 | variant = rule1 / rule2 / rule3... | ||
| 54 | @endcode | ||
| 55 | |||
| 56 | @par Specification | ||
| 57 | @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#section-3.2" | ||
| 58 | >3.2. Alternatives (rfc5234)</a> | ||
| 59 | @li <a href="https://datatracker.ietf.org/doc/html/rfc7230#section-5.3" | ||
| 60 | >5.3. Request Target (rfc7230)</a> | ||
| 61 | |||
| 62 | @see | ||
| 63 | @ref absolute_uri_rule, | ||
| 64 | @ref authority_rule, | ||
| 65 | @ref delim_rule, | ||
| 66 | @ref parse, | ||
| 67 | @ref origin_form_rule, | ||
| 68 | @ref url_view. | ||
| 69 | */ | ||
| 70 | #ifdef BOOST_URL_DOCS | ||
| 71 | template<class... Rules> | ||
| 72 | constexpr | ||
| 73 | __implementation_defined__ | ||
| 74 | variant_rule( Rules... rn ) noexcept; | ||
| 75 | #else | ||
| 76 | template< | ||
| 77 | class R0, class... Rn> | ||
| 78 | class variant_rule_t | ||
| 79 | { | ||
| 80 | public: | ||
| 81 | using value_type = variant< | ||
| 82 | typename R0::value_type, | ||
| 83 | typename Rn::value_type...>; | ||
| 84 | |||
| 85 | auto | ||
| 86 | parse( | ||
| 87 | char const*& it, | ||
| 88 | char const* end) const -> | ||
| 89 | system::result<value_type>; | ||
| 90 | |||
| 91 | template< | ||
| 92 | class R0_, | ||
| 93 | class... Rn_> | ||
| 94 | friend | ||
| 95 | constexpr | ||
| 96 | auto | ||
| 97 | variant_rule( | ||
| 98 | R0_ const& r0, | ||
| 99 | Rn_ const&... rn) noexcept -> | ||
| 100 | variant_rule_t<R0_, Rn_...>; | ||
| 101 | |||
| 102 | private: | ||
| 103 | constexpr | ||
| 104 | 2470 | variant_rule_t( | |
| 105 | R0 const& r0, | ||
| 106 | Rn const&... rn) noexcept | ||
| 107 | 2470 | : rn_(r0, rn...) | |
| 108 | { | ||
| 109 | 2470 | } | |
| 110 | |||
| 111 | detail::tuple<R0, Rn...> rn_; | ||
| 112 | }; | ||
| 113 | |||
| 114 | template< | ||
| 115 | class R0, | ||
| 116 | class... Rn> | ||
| 117 | constexpr | ||
| 118 | auto | ||
| 119 | variant_rule( | ||
| 120 | R0 const& r0, | ||
| 121 | Rn const&... rn) noexcept -> | ||
| 122 | variant_rule_t<R0, Rn...>; | ||
| 123 | #endif | ||
| 124 | |||
| 125 | } // grammar | ||
| 126 | } // urls | ||
| 127 | } // boost | ||
| 128 | |||
| 129 | #include <boost/url/grammar/impl/variant_rule.hpp> | ||
| 130 | |||
| 131 | #endif | ||
| 132 |