| 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 | #include <boost/url/grammar/type_traits.hpp> | ||
| 18 | |||
| 19 | namespace boost { | ||
| 20 | namespace urls { | ||
| 21 | namespace grammar { | ||
| 22 | |||
| 23 | namespace implementation_defined { | ||
| 24 | template< | ||
| 25 | class R0, class... Rn> | ||
| 26 | class variant_rule_t | ||
| 27 | { | ||
| 28 | public: | ||
| 29 | using value_type = variant2::variant< | ||
| 30 | typename R0::value_type, | ||
| 31 | typename Rn::value_type...>; | ||
| 32 | |||
| 33 | auto | ||
| 34 | parse( | ||
| 35 | char const*& it, | ||
| 36 | char const* end) const -> | ||
| 37 | system::result<value_type>; | ||
| 38 | |||
| 39 | constexpr | ||
| 40 | 2515 | variant_rule_t( | |
| 41 | R0 const& r0, | ||
| 42 | Rn const&... rn) noexcept | ||
| 43 | 2515 | : rn_(r0, rn...) | |
| 44 | { | ||
| 45 | 2515 | } | |
| 46 | |||
| 47 | private: | ||
| 48 | |||
| 49 | detail::tuple<R0, Rn...> rn_; | ||
| 50 | }; | ||
| 51 | } // implementation_defined | ||
| 52 | |||
| 53 | /** Match one of a set of rules | ||
| 54 | |||
| 55 | Each specified rule is tried in sequence. | ||
| 56 | When the first match occurs, the result | ||
| 57 | is stored and returned in the variant. If | ||
| 58 | no match occurs, an error is returned. | ||
| 59 | |||
| 60 | @param r0 The first rule to match | ||
| 61 | @param rn A list of one or more rules to match | ||
| 62 | @return The variant rule | ||
| 63 | |||
| 64 | @par Value Type | ||
| 65 | @code | ||
| 66 | using value_type = variant< typename Rules::value_type... >; | ||
| 67 | @endcode | ||
| 68 | |||
| 69 | @par Example | ||
| 70 | Rules are used with the function @ref parse. | ||
| 71 | @code | ||
| 72 | // request-target = origin-form | ||
| 73 | // / absolute-form | ||
| 74 | // / authority-form | ||
| 75 | // / asterisk-form | ||
| 76 | |||
| 77 | system::result< variant< url_view, url_view, authority_view, core::string_view > > rv = grammar::parse( | ||
| 78 | "/index.html?width=full", | ||
| 79 | variant_rule( | ||
| 80 | origin_form_rule, | ||
| 81 | absolute_uri_rule, | ||
| 82 | authority_rule, | ||
| 83 | delim_rule('*') ) ); | ||
| 84 | @endcode | ||
| 85 | |||
| 86 | @par BNF | ||
| 87 | @code | ||
| 88 | variant = rule1 / rule2 / rule3... | ||
| 89 | @endcode | ||
| 90 | |||
| 91 | @par Specification | ||
| 92 | @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#section-3.2" | ||
| 93 | >3.2. Alternatives (rfc5234)</a> | ||
| 94 | @li <a href="https://datatracker.ietf.org/doc/html/rfc7230#section-5.3" | ||
| 95 | >5.3. Request Target (rfc7230)</a> | ||
| 96 | |||
| 97 | @see | ||
| 98 | @ref absolute_uri_rule, | ||
| 99 | @ref authority_rule, | ||
| 100 | @ref delim_rule, | ||
| 101 | @ref parse, | ||
| 102 | @ref origin_form_rule, | ||
| 103 | @ref url_view. | ||
| 104 | */ | ||
| 105 | template< | ||
| 106 | BOOST_URL_CONSTRAINT(Rule) R0, | ||
| 107 | BOOST_URL_CONSTRAINT(Rule)... Rn> | ||
| 108 | constexpr | ||
| 109 | auto | ||
| 110 | variant_rule( | ||
| 111 | R0 const& r0, | ||
| 112 | Rn const&... rn) noexcept -> | ||
| 113 | implementation_defined::variant_rule_t<R0, Rn...>; | ||
| 114 | |||
| 115 | } // grammar | ||
| 116 | } // urls | ||
| 117 | } // boost | ||
| 118 | |||
| 119 | #include <boost/url/grammar/impl/variant_rule.hpp> | ||
| 120 | |||
| 121 | #endif | ||
| 122 |