libs/url/include/boost/url/format.hpp
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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2022 Alan de Freitas (alandefreitas@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/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_FORMAT_HPP | ||
| 11 | #define BOOST_URL_FORMAT_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/config.hpp> | ||
| 14 | #include <boost/core/detail/string_view.hpp> | ||
| 15 | #include <boost/url/url.hpp> | ||
| 16 | #include <boost/url/detail/vformat.hpp> | ||
| 17 | #include <initializer_list> | ||
| 18 | |||
| 19 | #ifdef BOOST_URL_HAS_CONCEPTS | ||
| 20 | #include <concepts> | ||
| 21 | #endif | ||
| 22 | |||
| 23 | namespace boost { | ||
| 24 | namespace urls { | ||
| 25 | |||
| 26 | /** A temporary reference to a named formatting argument | ||
| 27 | |||
| 28 | This class represents a temporary reference | ||
| 29 | to a named formatting argument used by the | ||
| 30 | @ref format function. | ||
| 31 | |||
| 32 | Named arguments should always be created | ||
| 33 | with the @ref arg function. | ||
| 34 | |||
| 35 | Any type that can be formatted into a URL | ||
| 36 | with the @ref format function can also be used | ||
| 37 | in a named argument. All named arguments | ||
| 38 | are convertible to @ref format_arg and | ||
| 39 | can be used in the @ref format function. | ||
| 40 | |||
| 41 | @see | ||
| 42 | @ref arg, | ||
| 43 | @ref format, | ||
| 44 | @ref format_to, | ||
| 45 | @ref format_arg. | ||
| 46 | */ | ||
| 47 | template <class T> | ||
| 48 | using named_arg = detail::named_arg<T>; | ||
| 49 | |||
| 50 | /** A temporary reference to a formatting argument | ||
| 51 | |||
| 52 | This class represents a temporary reference | ||
| 53 | to a formatting argument used by the | ||
| 54 | @ref format function. | ||
| 55 | |||
| 56 | A @ref format argument should always be | ||
| 57 | created by passing the argument to be | ||
| 58 | formatted directly to the @ref format function. | ||
| 59 | |||
| 60 | Any type that can be formatted into a URL | ||
| 61 | with the @ref format function is convertible | ||
| 62 | to this type. | ||
| 63 | |||
| 64 | This includes basic types, types convertible | ||
| 65 | to `core::string_view`, and @ref named_arg. | ||
| 66 | |||
| 67 | @see | ||
| 68 | @ref format, | ||
| 69 | @ref format_to, | ||
| 70 | @ref arg. | ||
| 71 | */ | ||
| 72 | using format_arg = detail::format_arg; | ||
| 73 | |||
| 74 | /** Format arguments into a URL | ||
| 75 | |||
| 76 | Format arguments according to the format | ||
| 77 | URL string into a @ref url. | ||
| 78 | |||
| 79 | The rules for a format URL string are the same | ||
| 80 | as for a `std::format_string`, where replacement | ||
| 81 | fields are delimited by curly braces. | ||
| 82 | |||
| 83 | The URL components to which replacement fields | ||
| 84 | belong are identified before replacement is | ||
| 85 | applied and any invalid characters for that | ||
| 86 | formatted argument are percent-escaped. | ||
| 87 | |||
| 88 | Hence, the delimiters between URL components, | ||
| 89 | such as `:`, `//`, `?`, and `#`, should be | ||
| 90 | included in the URL format string. Likewise, | ||
| 91 | a format string with a single `"{}"` is | ||
| 92 | interpreted as a path and any replacement | ||
| 93 | characters invalid in this component will be | ||
| 94 | encoded to form a valid URL. | ||
| 95 | |||
| 96 | @par Example | ||
| 97 | @code | ||
| 98 | assert(format("{}", "Hello world!").buffer() == "Hello%20world%21"); | ||
| 99 | @endcode | ||
| 100 | |||
| 101 | @note | ||
| 102 | The formatting machinery relies on language and library | ||
| 103 | features that are broken on GCC 4.8 and GCC 5.x, so this | ||
| 104 | function is not supported on those compilers. | ||
| 105 | |||
| 106 | @par Preconditions | ||
| 107 | All replacement fields must be valid and the | ||
| 108 | resulting URL should be valid after arguments | ||
| 109 | are formatted into the URL. | ||
| 110 | |||
| 111 | Because any invalid characters for a URL | ||
| 112 | component are encoded by this function, only | ||
| 113 | replacements in the scheme and port components | ||
| 114 | might be invalid, as these components do not | ||
| 115 | allow percent-encoding of arbitrary | ||
| 116 | characters. | ||
| 117 | |||
| 118 | @return A URL holding the formatted result. | ||
| 119 | |||
| 120 | @param fmt The format URL string. | ||
| 121 | @param args Arguments to be formatted. | ||
| 122 | |||
| 123 | @throws system_error | ||
| 124 | `fmt` contains an invalid format string and | ||
| 125 | the result contains an invalid URL after | ||
| 126 | replacements are applied. | ||
| 127 | |||
| 128 | @par BNF | ||
| 129 | @code | ||
| 130 | replacement_field ::= "{" [arg_id] [":" (format_spec | chrono_format_spec)] "}" | ||
| 131 | arg_id ::= integer | identifier | ||
| 132 | integer ::= digit+ | ||
| 133 | digit ::= "0"..."9" | ||
| 134 | identifier ::= id_start id_continue* | ||
| 135 | id_start ::= "a"..."z" | "A"..."Z" | "_" | ||
| 136 | id_continue ::= id_start | digit | ||
| 137 | @endcode | ||
| 138 | |||
| 139 | @par Specification | ||
| 140 | @li <a href="https://fmt.dev/latest/syntax.html" | ||
| 141 | >Format String Syntax</a> | ||
| 142 | |||
| 143 | @see | ||
| 144 | @ref format_to, | ||
| 145 | @ref arg. | ||
| 146 | */ | ||
| 147 | template <BOOST_URL_CONSTRAINT(std::convertible_to<format_arg>)... Args> | ||
| 148 | url | ||
| 149 | 147 | format( | |
| 150 | core::string_view fmt, | ||
| 151 | Args&&... args) | ||
| 152 | { | ||
| 153 | return detail::vformat( | ||
| 154 |
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157 | fmt, detail::make_format_args( |
| 155 |
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284 | std::forward<Args>(args)...)); |
| 156 | } | ||
| 157 | |||
| 158 | /** Format arguments into a URL | ||
| 159 | |||
| 160 | Format arguments according to the format | ||
| 161 | URL string into a @ref url_base. | ||
| 162 | |||
| 163 | The rules for a format URL string are the same | ||
| 164 | as for a `std::format_string`, where replacement | ||
| 165 | fields are delimited by curly braces. | ||
| 166 | |||
| 167 | The URL components to which replacement fields | ||
| 168 | belong are identified before replacement is | ||
| 169 | applied and any invalid characters for that | ||
| 170 | formatted argument are percent-escaped. | ||
| 171 | |||
| 172 | Hence, the delimiters between URL components, | ||
| 173 | such as `:`, `//`, `?`, and `#`, should be | ||
| 174 | included in the URL format string. Likewise, | ||
| 175 | a format string with a single `"{}"` is | ||
| 176 | interpreted as a path and any replacement | ||
| 177 | characters invalid in this component will be | ||
| 178 | encoded to form a valid URL. | ||
| 179 | |||
| 180 | @par Example | ||
| 181 | @code | ||
| 182 | static_url<30> u; | ||
| 183 | format(u, "{}", "Hello world!"); | ||
| 184 | assert(u.buffer() == "Hello%20world%21"); | ||
| 185 | @endcode | ||
| 186 | |||
| 187 | @par Preconditions | ||
| 188 | All replacement fields must be valid and the | ||
| 189 | resulting URL should be valid after arguments | ||
| 190 | are formatted into the URL. | ||
| 191 | |||
| 192 | Because any invalid characters for a URL | ||
| 193 | component are encoded by this function, only | ||
| 194 | replacements in the scheme and port components | ||
| 195 | might be invalid, as these components do not | ||
| 196 | allow percent-encoding of arbitrary | ||
| 197 | characters. | ||
| 198 | |||
| 199 | @par Exception Safety | ||
| 200 | Strong guarantee. | ||
| 201 | |||
| 202 | @param u An object that derives from @ref url_base. | ||
| 203 | @param fmt The format URL string. | ||
| 204 | @param args Arguments to be formatted. | ||
| 205 | |||
| 206 | @throws system_error | ||
| 207 | `fmt` contains an invalid format string and | ||
| 208 | `u` contains an invalid URL after replacements | ||
| 209 | are applied. | ||
| 210 | |||
| 211 | @par BNF | ||
| 212 | @code | ||
| 213 | replacement_field ::= "{" [arg_id] [":" (format_spec | chrono_format_spec)] "}" | ||
| 214 | arg_id ::= integer | identifier | ||
| 215 | integer ::= digit+ | ||
| 216 | digit ::= "0"..."9" | ||
| 217 | identifier ::= id_start id_continue* | ||
| 218 | id_start ::= "a"..."z" | "A"..."Z" | "_" | ||
| 219 | id_continue ::= id_start | digit | ||
| 220 | @endcode | ||
| 221 | |||
| 222 | @par Specification | ||
| 223 | @li <a href="https://fmt.dev/latest/syntax.html" | ||
| 224 | >Format String Syntax</a> | ||
| 225 | |||
| 226 | @see | ||
| 227 | @ref format. | ||
| 228 | |||
| 229 | */ | ||
| 230 | template <BOOST_URL_CONSTRAINT(std::convertible_to<format_arg>)... Args> | ||
| 231 | void | ||
| 232 | 4 | format_to( | |
| 233 | url_base& u, | ||
| 234 | core::string_view fmt, | ||
| 235 | Args&&... args) | ||
| 236 | { | ||
| 237 |
2/2void boost::urls::format_to<char const (&) [6], char const (&) [13], int, char const (&) [12]>(boost::urls::url_base&, boost::core::basic_string_view<char>, char const (&) [6], char const (&) [13], int&&, char const (&) [12]):
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void boost::urls::format_to<char const (&) [6], char const (&) [14]>(boost::urls::url_base&, boost::core::basic_string_view<char>, char const (&) [6], char const (&) [14]):
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4 | detail::vformat_to( |
| 238 |
2/2void boost::urls::format_to<char const (&) [6], char const (&) [13], int, char const (&) [12]>(boost::urls::url_base&, boost::core::basic_string_view<char>, char const (&) [6], char const (&) [13], int&&, char const (&) [12]):
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void boost::urls::format_to<char const (&) [6], char const (&) [14]>(boost::urls::url_base&, boost::core::basic_string_view<char>, char const (&) [6], char const (&) [14]):
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5 | u, fmt, detail::make_format_args( |
| 239 | std::forward<Args>(args)...)); | ||
| 240 | 3 | } | |
| 241 | |||
| 242 | /** Format arguments into a URL | ||
| 243 | |||
| 244 | Format arguments according to the format | ||
| 245 | URL string into a @ref url. | ||
| 246 | |||
| 247 | This overload allows type-erased arguments | ||
| 248 | to be passed as an initializer_list, which | ||
| 249 | is mostly convenient for named parameters. | ||
| 250 | |||
| 251 | All arguments must be convertible to a | ||
| 252 | implementation defined type able to store a | ||
| 253 | type-erased reference to any valid format | ||
| 254 | argument. | ||
| 255 | |||
| 256 | The rules for a format URL string are the same | ||
| 257 | as for a `std::format_string`, where replacement | ||
| 258 | fields are delimited by curly braces. | ||
| 259 | |||
| 260 | The URL components to which replacement fields | ||
| 261 | belong are identified before replacement is | ||
| 262 | applied and any invalid characters for that | ||
| 263 | formatted argument are percent-escaped. | ||
| 264 | |||
| 265 | Hence, the delimiters between URL components, | ||
| 266 | such as `:`, `//`, `?`, and `#`, should be | ||
| 267 | included in the URL format string. Likewise, | ||
| 268 | a format string with a single `"{}"` is | ||
| 269 | interpreted as a path and any replacement | ||
| 270 | characters invalid in this component will be | ||
| 271 | encoded to form a valid URL. | ||
| 272 | |||
| 273 | @par Example | ||
| 274 | @code | ||
| 275 | assert(format("user/{id}", {{"id", 1}}).buffer() == "user/1"); | ||
| 276 | @endcode | ||
| 277 | |||
| 278 | @par Preconditions | ||
| 279 | All replacement fields must be valid and the | ||
| 280 | resulting URL should be valid after arguments | ||
| 281 | are formatted into the URL. | ||
| 282 | |||
| 283 | Because any invalid characters for a URL | ||
| 284 | component are encoded by this function, only | ||
| 285 | replacements in the scheme and port components | ||
| 286 | might be invalid, as these components do not | ||
| 287 | allow percent-encoding of arbitrary | ||
| 288 | characters. | ||
| 289 | |||
| 290 | @return A URL holding the formatted result. | ||
| 291 | |||
| 292 | @param fmt The format URL string. | ||
| 293 | @param args Arguments to be formatted. | ||
| 294 | |||
| 295 | @throws system_error | ||
| 296 | `fmt` contains an invalid format string and | ||
| 297 | the result contains an invalid URL after | ||
| 298 | replacements are applied. | ||
| 299 | |||
| 300 | @par BNF | ||
| 301 | @code | ||
| 302 | replacement_field ::= "{" [arg_id] [":" (format_spec | chrono_format_spec)] "}" | ||
| 303 | arg_id ::= integer | identifier | ||
| 304 | integer ::= digit+ | ||
| 305 | digit ::= "0"..."9" | ||
| 306 | identifier ::= id_start id_continue* | ||
| 307 | id_start ::= "a"..."z" | "A"..."Z" | "_" | ||
| 308 | id_continue ::= id_start | digit | ||
| 309 | @endcode | ||
| 310 | |||
| 311 | @par Specification | ||
| 312 | @li <a href="https://fmt.dev/latest/syntax.html" | ||
| 313 | >Format String Syntax</a> | ||
| 314 | |||
| 315 | @see | ||
| 316 | @ref format_to. | ||
| 317 | |||
| 318 | */ | ||
| 319 | inline | ||
| 320 | url | ||
| 321 | 3 | format( | |
| 322 | core::string_view fmt, | ||
| 323 | std::initializer_list<format_arg> args) | ||
| 324 | { | ||
| 325 | return detail::vformat( | ||
| 326 | fmt, detail::format_args( | ||
| 327 |
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3 | args.begin(), args.end())); |
| 328 | } | ||
| 329 | |||
| 330 | /** Format arguments into a URL | ||
| 331 | |||
| 332 | Format arguments according to the format | ||
| 333 | URL string into a @ref url_base. | ||
| 334 | |||
| 335 | This overload allows type-erased arguments | ||
| 336 | to be passed as an initializer_list, which | ||
| 337 | is mostly convenient for named parameters. | ||
| 338 | |||
| 339 | All arguments must be convertible to a | ||
| 340 | implementation defined type able to store a | ||
| 341 | type-erased reference to any valid format | ||
| 342 | argument. | ||
| 343 | |||
| 344 | The rules for a format URL string are the same | ||
| 345 | as for a `std::format_string`, where replacement | ||
| 346 | fields are delimited by curly braces. | ||
| 347 | |||
| 348 | The URL components to which replacement fields | ||
| 349 | belong are identified before replacement is | ||
| 350 | applied and any invalid characters for that | ||
| 351 | formatted argument are percent-escaped. | ||
| 352 | |||
| 353 | Hence, the delimiters between URL components, | ||
| 354 | such as `:`, `//`, `?`, and `#`, should be | ||
| 355 | included in the URL format string. Likewise, | ||
| 356 | a format string with a single `"{}"` is | ||
| 357 | interpreted as a path and any replacement | ||
| 358 | characters invalid in this component will be | ||
| 359 | encoded to form a valid URL. | ||
| 360 | |||
| 361 | @par Example | ||
| 362 | @code | ||
| 363 | static_url<30> u; | ||
| 364 | format_to(u, "user/{id}", {{"id", 1}}) | ||
| 365 | assert(u.buffer() == "user/1"); | ||
| 366 | @endcode | ||
| 367 | |||
| 368 | @par Preconditions | ||
| 369 | All replacement fields must be valid and the | ||
| 370 | resulting URL should be valid after arguments | ||
| 371 | are formatted into the URL. | ||
| 372 | |||
| 373 | Because any invalid characters for a URL | ||
| 374 | component are encoded by this function, only | ||
| 375 | replacements in the scheme and port components | ||
| 376 | might be invalid, as these components do not | ||
| 377 | allow percent-encoding of arbitrary | ||
| 378 | characters. | ||
| 379 | |||
| 380 | @par Exception Safety | ||
| 381 | Strong guarantee. | ||
| 382 | |||
| 383 | @param u An object that derives from @ref url_base. | ||
| 384 | @param fmt The format URL string. | ||
| 385 | @param args Arguments to be formatted. | ||
| 386 | |||
| 387 | @throws system_error | ||
| 388 | `fmt` contains an invalid format string and | ||
| 389 | `u` contains an invalid URL after replacements | ||
| 390 | are applied. | ||
| 391 | |||
| 392 | @par BNF | ||
| 393 | @code | ||
| 394 | replacement_field ::= "{" [arg_id] [":" (format_spec | chrono_format_spec)] "}" | ||
| 395 | arg_id ::= integer | identifier | ||
| 396 | integer ::= digit+ | ||
| 397 | digit ::= "0"..."9" | ||
| 398 | identifier ::= id_start id_continue* | ||
| 399 | id_start ::= "a"..."z" | "A"..."Z" | "_" | ||
| 400 | id_continue ::= id_start | digit | ||
| 401 | @endcode | ||
| 402 | |||
| 403 | @par Specification | ||
| 404 | @li <a href="https://fmt.dev/latest/syntax.html" | ||
| 405 | >Format String Syntax</a> | ||
| 406 | |||
| 407 | @see | ||
| 408 | @ref format. | ||
| 409 | |||
| 410 | */ | ||
| 411 | inline | ||
| 412 | void | ||
| 413 | 1 | format_to( | |
| 414 | url_base& u, | ||
| 415 | core::string_view fmt, | ||
| 416 | std::initializer_list<format_arg> args) | ||
| 417 | { | ||
| 418 |
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1 | detail::vformat_to( |
| 419 | u, fmt, detail::format_args( | ||
| 420 | args.begin(), args.end())); | ||
| 421 | 1 | } | |
| 422 | |||
| 423 | /** Designate a named argument for a replacement field | ||
| 424 | |||
| 425 | Construct a named argument for a format URL | ||
| 426 | string that contains named replacement fields. | ||
| 427 | |||
| 428 | The function parameters should be convertible | ||
| 429 | to an implementation defined type able to | ||
| 430 | store the name and a reference to any type | ||
| 431 | potentially used as a format argument. | ||
| 432 | |||
| 433 | @par Example | ||
| 434 | The function should be used to designate a named | ||
| 435 | argument for a replacement field in a format | ||
| 436 | URL string. | ||
| 437 | @code | ||
| 438 | assert(format("user/{id}", arg("id", 1)).buffer() == "user/1"); | ||
| 439 | @endcode | ||
| 440 | |||
| 441 | @return A temporary object with reference | ||
| 442 | semantics for a named argument | ||
| 443 | |||
| 444 | @param name The format argument name | ||
| 445 | @param arg The format argument value | ||
| 446 | |||
| 447 | @see | ||
| 448 | @ref format, | ||
| 449 | @ref format_to. | ||
| 450 | |||
| 451 | */ | ||
| 452 | template <class T> | ||
| 453 | named_arg<T> | ||
| 454 | 20 | arg(core::string_view name, T const& arg) | |
| 455 | { | ||
| 456 | 20 | return {name, arg}; | |
| 457 | } | ||
| 458 | |||
| 459 | } // url | ||
| 460 | } // boost | ||
| 461 | |||
| 462 | #endif | ||
| 463 |