| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2021 Vinnie Falco (vinnie.falco@gmail.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/cppalliance/http_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_HTTP_PROTO_RFC_LIST_RULE_HPP | ||
| 11 | #define BOOST_HTTP_PROTO_RFC_LIST_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/http_proto/detail/config.hpp> | ||
| 14 | #include <boost/url/grammar/range_rule.hpp> | ||
| 15 | #include <boost/core/empty_value.hpp> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace http_proto { | ||
| 19 | |||
| 20 | namespace implementation_defined { | ||
| 21 | template<class Rule> | ||
| 22 | struct list_rule_t | ||
| 23 | : private empty_value<Rule> | ||
| 24 | { | ||
| 25 | using value_type = grammar::range< | ||
| 26 | typename Rule::value_type>; | ||
| 27 | |||
| 28 | constexpr | ||
| 29 | 8760 | list_rule_t( | |
| 30 | Rule const& r, | ||
| 31 | std::size_t n, | ||
| 32 | std::size_t m) noexcept | ||
| 33 | : empty_value<Rule>( | ||
| 34 | empty_init, r) | ||
| 35 | 8760 | , n_(n) | |
| 36 | 8760 | , m_(m) | |
| 37 | { | ||
| 38 | 8760 | } | |
| 39 | |||
| 40 | auto | ||
| 41 | parse( | ||
| 42 | char const*& it, | ||
| 43 | char const* end) const -> | ||
| 44 | system::result<value_type>; | ||
| 45 | |||
| 46 | private: | ||
| 47 | struct first_rule; | ||
| 48 | struct next_rule; | ||
| 49 | |||
| 50 | std::size_t n_; | ||
| 51 | std::size_t m_; | ||
| 52 | }; | ||
| 53 | } // implementation_defined | ||
| 54 | |||
| 55 | /** Rule for a comma-delimited list of elements | ||
| 56 | |||
| 57 | This rule defines a list containing | ||
| 58 | at least n and at most m of Element, | ||
| 59 | each separated by at least one comma | ||
| 60 | and optional whitespace. | ||
| 61 | |||
| 62 | @par BNF | ||
| 63 | @code | ||
| 64 | #element => [ 1#element ] | ||
| 65 | 1#element => element *( OWS "," OWS element ) | ||
| 66 | <n>#<m>element => element <n-1>*<m-1>( OWS "," OWS element ) | ||
| 67 | @endcode | ||
| 68 | |||
| 69 | Senders must emit compliant values, but | ||
| 70 | receivers should accept values generated | ||
| 71 | with the legacy production rules: | ||
| 72 | |||
| 73 | @par Legacy BNF | ||
| 74 | @code | ||
| 75 | #element => [ ( "," / element ) *( OWS "," [ OWS element ] ) ] | ||
| 76 | |||
| 77 | 1#element => *( "," OWS ) element *( OWS "," [ OWS element ] ) | ||
| 78 | @endcode | ||
| 79 | |||
| 80 | @tparam Rule The rule type. | ||
| 81 | |||
| 82 | @param r The rule to use for elements. | ||
| 83 | @param n The minimum number of elements, which may be zero. | ||
| 84 | @param m The maximum number of elements. | ||
| 85 | |||
| 86 | @return A rule that matches the list. | ||
| 87 | |||
| 88 | @par Specification | ||
| 89 | @li <a href="https://datatracker.ietf.org/doc/html/rfc7230#section-7" | ||
| 90 | >5.6.1. Lists (#rule ABNF Extension) (rfc7230)</a> | ||
| 91 | */ | ||
| 92 | template<class Rule> | ||
| 93 | constexpr | ||
| 94 | auto | ||
| 95 | 4530 | list_rule( | |
| 96 | Rule const& r, | ||
| 97 | std::size_t n = 0, | ||
| 98 | std::size_t m = | ||
| 99 | std::size_t(-1)) noexcept -> | ||
| 100 | implementation_defined::list_rule_t<Rule> | ||
| 101 | { | ||
| 102 | 4530 | return implementation_defined::list_rule_t<Rule>(r, n, m); | |
| 103 | } | ||
| 104 | |||
| 105 | } // http_proto | ||
| 106 | } // boost | ||
| 107 | |||
| 108 | #include <boost/http_proto/rfc/impl/list_rule.hpp> | ||
| 109 | |||
| 110 | #endif | ||
| 111 |