| 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_TUPLE_RULE_HPP | ||
| 11 | #define BOOST_URL_GRAMMAR_TUPLE_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/config.hpp> | ||
| 14 | #include <boost/url/error_types.hpp> | ||
| 15 | #include <boost/url/grammar/error.hpp> | ||
| 16 | #include <boost/url/grammar/detail/tuple.hpp> | ||
| 17 | #include <boost/mp11/algorithm.hpp> | ||
| 18 | #include <boost/core/empty_value.hpp> | ||
| 19 | #include <tuple> | ||
| 20 | |||
| 21 | namespace boost { | ||
| 22 | namespace urls { | ||
| 23 | namespace grammar { | ||
| 24 | |||
| 25 | /** Match a series of rules in order | ||
| 26 | |||
| 27 | This matches a series of rules in the | ||
| 28 | order specified. Upon success the input | ||
| 29 | is adjusted to point to the first | ||
| 30 | unconsumed character. There is no | ||
| 31 | implicit specification of linear white | ||
| 32 | space between each rule. | ||
| 33 | |||
| 34 | @par Value Type | ||
| 35 | @code | ||
| 36 | using value_type = __see_below__; | ||
| 37 | @endcode | ||
| 38 | |||
| 39 | The sequence rule usually returns a | ||
| 40 | `std::tuple` containing the the `value_type` | ||
| 41 | of each corresponding rule in the sequence, | ||
| 42 | except that `void` values are removed. | ||
| 43 | However, if there is exactly one non-void | ||
| 44 | value type `T`, then the sequence rule | ||
| 45 | returns `system::result<T>` instead of | ||
| 46 | `system::result<tuple<...>>`. | ||
| 47 | |||
| 48 | @par Example | ||
| 49 | Rules are used with the function @ref parse. | ||
| 50 | @code | ||
| 51 | system::result< std::tuple< unsigned char, unsigned char, unsigned char, unsigned char > > rv = | ||
| 52 | parse( "192.168.0.1", | ||
| 53 | tuple_rule( | ||
| 54 | dec_octet_rule, | ||
| 55 | squelch( delim_rule('.') ), | ||
| 56 | dec_octet_rule, | ||
| 57 | squelch( delim_rule('.') ), | ||
| 58 | dec_octet_rule, | ||
| 59 | squelch( delim_rule('.') ), | ||
| 60 | dec_octet_rule ) ); | ||
| 61 | @endcode | ||
| 62 | |||
| 63 | @par BNF | ||
| 64 | @code | ||
| 65 | sequence = rule1 rule2 rule3... | ||
| 66 | @endcode | ||
| 67 | |||
| 68 | @par Specification | ||
| 69 | @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#section-3.1" | ||
| 70 | >3.1. Concatenation (rfc5234)</a> | ||
| 71 | |||
| 72 | @param rn A list of one or more rules to match | ||
| 73 | |||
| 74 | @see | ||
| 75 | @ref dec_octet_rule, | ||
| 76 | @ref delim_rule, | ||
| 77 | @ref parse, | ||
| 78 | @ref squelch. | ||
| 79 | */ | ||
| 80 | #ifdef BOOST_URL_DOCS | ||
| 81 | template<class... Rules> | ||
| 82 | constexpr | ||
| 83 | __implementation_defined__ | ||
| 84 | tuple_rule( Rules... rn ) noexcept; | ||
| 85 | #else | ||
| 86 | template< | ||
| 87 | class R0, | ||
| 88 | class... Rn> | ||
| 89 | class tuple_rule_t | ||
| 90 | : empty_value< | ||
| 91 | detail::tuple<R0, Rn...>> | ||
| 92 | { | ||
| 93 | using T = mp11::mp_remove< | ||
| 94 | std::tuple< | ||
| 95 | typename R0::value_type, | ||
| 96 | typename Rn::value_type...>, | ||
| 97 | void>; | ||
| 98 | static constexpr bool IsList = | ||
| 99 | mp11::mp_size<T>::value != 1; | ||
| 100 | |||
| 101 | public: | ||
| 102 | using value_type = | ||
| 103 | mp11::mp_eval_if_c<IsList, | ||
| 104 | T, mp11::mp_first, T>; | ||
| 105 | |||
| 106 | template< | ||
| 107 | class R0_, | ||
| 108 | class... Rn_> | ||
| 109 | friend | ||
| 110 | constexpr | ||
| 111 | auto | ||
| 112 | tuple_rule( | ||
| 113 | R0_ const& r0, | ||
| 114 | Rn_ const&... rn) noexcept -> | ||
| 115 | tuple_rule_t<R0_, Rn_...>; | ||
| 116 | |||
| 117 | system::result<value_type> | ||
| 118 | parse( | ||
| 119 | char const*& it, | ||
| 120 | char const* end) const; | ||
| 121 | |||
| 122 | private: | ||
| 123 | constexpr | ||
| 124 | 8248 | tuple_rule_t( | |
| 125 | R0 const& r0, | ||
| 126 | Rn const&... rn) noexcept | ||
| 127 | : empty_value< | ||
| 128 | detail::tuple<R0, Rn...>>( | ||
| 129 | empty_init, | ||
| 130 | 8248 | r0, rn...) | |
| 131 | { | ||
| 132 | 8248 | } | |
| 133 | }; | ||
| 134 | |||
| 135 | template< | ||
| 136 | class R0, | ||
| 137 | class... Rn> | ||
| 138 | constexpr | ||
| 139 | auto | ||
| 140 | 8248 | tuple_rule( | |
| 141 | R0 const& r0, | ||
| 142 | Rn const&... rn) noexcept -> | ||
| 143 | tuple_rule_t< | ||
| 144 | R0, Rn...> | ||
| 145 | { | ||
| 146 | 8248 | return { r0, rn... }; | |
| 147 | } | ||
| 148 | #endif | ||
| 149 | |||
| 150 | #ifndef BOOST_URL_DOCS | ||
| 151 | namespace detail { | ||
| 152 | |||
| 153 | template<class Rule> | ||
| 154 | struct squelch_rule_t | ||
| 155 | : empty_value<Rule> | ||
| 156 | { | ||
| 157 | using value_type = void; | ||
| 158 | |||
| 159 | constexpr | ||
| 160 | 11264 | squelch_rule_t( | |
| 161 | Rule const& r) noexcept | ||
| 162 | : empty_value<Rule>( | ||
| 163 | 11264 | empty_init, r) | |
| 164 | { | ||
| 165 | 11264 | } | |
| 166 | |||
| 167 | system::result<value_type> | ||
| 168 | 7994 | parse( | |
| 169 | char const*& it, | ||
| 170 | char const* end) const | ||
| 171 | { | ||
| 172 | 8107 | auto rv = this->get().parse(it, end); | |
| 173 |
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7994 | if(rv.error()) |
| 174 | 3309 | return rv.error(); | |
| 175 | 4685 | return {}; // void | |
| 176 | } | ||
| 177 | }; | ||
| 178 | |||
| 179 | } // detail | ||
| 180 | #endif | ||
| 181 | |||
| 182 | /** Squelch the value of a rule | ||
| 183 | |||
| 184 | This function returns a new rule which | ||
| 185 | matches the specified rule, and converts | ||
| 186 | its value type to `void`. This is useful | ||
| 187 | for matching delimiters in a grammar, | ||
| 188 | where the value for the delimiter is not | ||
| 189 | needed. | ||
| 190 | |||
| 191 | @par Value Type | ||
| 192 | @code | ||
| 193 | using value_type = void; | ||
| 194 | @endcode | ||
| 195 | |||
| 196 | @par Example 1 | ||
| 197 | With `squelch`: | ||
| 198 | @code | ||
| 199 | system::result< std::tuple< decode_view, core::string_view > > rv = parse( | ||
| 200 | "www.example.com:443", | ||
| 201 | tuple_rule( | ||
| 202 | pct_encoded_rule(unreserved_chars + '-' + '.'), | ||
| 203 | squelch( delim_rule( ':' ) ), | ||
| 204 | token_rule( digit_chars ) ) ); | ||
| 205 | @endcode | ||
| 206 | |||
| 207 | @par Example 2 | ||
| 208 | Without `squelch`: | ||
| 209 | @code | ||
| 210 | system::result< std::tuple< decode_view, core::string_view, core::string_view > > rv = parse( | ||
| 211 | "www.example.com:443", | ||
| 212 | tuple_rule( | ||
| 213 | pct_encoded_rule(unreserved_chars + '-' + '.'), | ||
| 214 | delim_rule( ':' ), | ||
| 215 | token_rule( digit_chars ) ) ); | ||
| 216 | @endcode | ||
| 217 | |||
| 218 | @param r The rule to squelch | ||
| 219 | |||
| 220 | @see | ||
| 221 | @ref delim_rule, | ||
| 222 | @ref digit_chars, | ||
| 223 | @ref parse, | ||
| 224 | @ref tuple_rule, | ||
| 225 | @ref token_rule, | ||
| 226 | @ref decode_view, | ||
| 227 | @ref pct_encoded_rule, | ||
| 228 | @ref unreserved_chars. | ||
| 229 | */ | ||
| 230 | template<class Rule> | ||
| 231 | constexpr | ||
| 232 | #ifdef BOOST_URL_DOCS | ||
| 233 | __implementation_defined__ | ||
| 234 | #else | ||
| 235 | detail::squelch_rule_t<Rule> | ||
| 236 | #endif | ||
| 237 | 11264 | squelch( Rule const& r ) noexcept | |
| 238 | { | ||
| 239 | 11264 | return { r }; | |
| 240 | } | ||
| 241 | |||
| 242 | } // grammar | ||
| 243 | } // urls | ||
| 244 | } // boost | ||
| 245 | |||
| 246 | #include <boost/url/grammar/impl/tuple_rule.hpp> | ||
| 247 | |||
| 248 | #endif | ||
| 249 |