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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 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/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_DETAIL_ANY_PARAMS_ITER_HPP | ||
| 11 | #define BOOST_URL_DETAIL_ANY_PARAMS_ITER_HPP | ||
| 12 | |||
| 13 | #include <boost/url/param.hpp> | ||
| 14 | #include <boost/url/pct_string_view.hpp> | ||
| 15 | #include <boost/static_assert.hpp> | ||
| 16 | #include <cstddef> | ||
| 17 | #include <iterator> | ||
| 18 | #include <type_traits> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace urls { | ||
| 22 | namespace detail { | ||
| 23 | |||
| 24 | //------------------------------------------------ | ||
| 25 | // | ||
| 26 | // any_params_iter | ||
| 27 | // | ||
| 28 | //------------------------------------------------ | ||
| 29 | |||
| 30 | /* An iterator to a type-erased, | ||
| 31 | possibly encoded sequence of | ||
| 32 | query params_ref. | ||
| 33 | */ | ||
| 34 | struct BOOST_SYMBOL_VISIBLE | ||
| 35 | any_params_iter | ||
| 36 | { | ||
| 37 | protected: | ||
| 38 | 138 | any_params_iter( | |
| 39 | bool empty_, | ||
| 40 | core::string_view s0_ = {}, | ||
| 41 | core::string_view s1_ = {}) noexcept | ||
| 42 | 138 | : s0(s0_) | |
| 43 | 138 | , s1(s1_) | |
| 44 | 138 | , empty(empty_) | |
| 45 | { | ||
| 46 | 138 | } | |
| 47 | |||
| 48 | public: | ||
| 49 | // these are adjusted | ||
| 50 | // when self-intersecting | ||
| 51 | core::string_view s0; | ||
| 52 | core::string_view s1; | ||
| 53 | |||
| 54 | // True if the sequence is empty | ||
| 55 | bool empty = false; | ||
| 56 | |||
| 57 | BOOST_URL_DECL | ||
| 58 | virtual | ||
| 59 | ~any_params_iter() noexcept = 0; | ||
| 60 | |||
| 61 | // Rewind the iterator to the beginning | ||
| 62 | virtual | ||
| 63 | void | ||
| 64 | rewind() noexcept = 0; | ||
| 65 | |||
| 66 | // Measure and increment current element | ||
| 67 | // element. | ||
| 68 | // Returns false on end of range. | ||
| 69 | // n is increased by encoded size. | ||
| 70 | // Can throw on bad percent-escape | ||
| 71 | virtual | ||
| 72 | bool | ||
| 73 | measure(std::size_t& n) = 0; | ||
| 74 | |||
| 75 | // Copy and increment the current | ||
| 76 | // element. encoding is performed | ||
| 77 | // if needed. | ||
| 78 | virtual | ||
| 79 | void | ||
| 80 | copy( | ||
| 81 | char*& dest, | ||
| 82 | char const* end) noexcept = 0; | ||
| 83 | }; | ||
| 84 | |||
| 85 | //------------------------------------------------ | ||
| 86 | // | ||
| 87 | // query_iter | ||
| 88 | // | ||
| 89 | //------------------------------------------------ | ||
| 90 | |||
| 91 | // A string of plain query params | ||
| 92 | struct BOOST_SYMBOL_VISIBLE | ||
| 93 | query_iter | ||
| 94 | : any_params_iter | ||
| 95 | { | ||
| 96 | // ne = never empty | ||
| 97 | BOOST_URL_DECL | ||
| 98 | explicit | ||
| 99 | query_iter( | ||
| 100 | core::string_view s, | ||
| 101 | bool ne = false) noexcept; | ||
| 102 | |||
| 103 | private: | ||
| 104 | core::string_view s_; | ||
| 105 | std::size_t n_; | ||
| 106 | char const* p_; | ||
| 107 | bool at_end_; | ||
| 108 | |||
| 109 | void rewind() noexcept override; | ||
| 110 | bool measure(std::size_t&) noexcept override; | ||
| 111 | void copy(char*&, char const*) noexcept override; | ||
| 112 | void increment() noexcept; | ||
| 113 | }; | ||
| 114 | |||
| 115 | //------------------------------------------------ | ||
| 116 | // | ||
| 117 | // param_iter | ||
| 118 | // | ||
| 119 | //------------------------------------------------ | ||
| 120 | |||
| 121 | // A 1-param range allowing | ||
| 122 | // self-intersection | ||
| 123 | struct BOOST_SYMBOL_VISIBLE | ||
| 124 | param_iter | ||
| 125 | : any_params_iter | ||
| 126 | { | ||
| 127 | explicit | ||
| 128 | param_iter( | ||
| 129 | param_view const&) noexcept; | ||
| 130 | |||
| 131 | private: | ||
| 132 | bool has_value_; | ||
| 133 | bool at_end_ = false; | ||
| 134 | |||
| 135 | void rewind() noexcept override; | ||
| 136 | bool measure(std::size_t&) noexcept override; | ||
| 137 | void copy(char*&, char const*) noexcept override; | ||
| 138 | }; | ||
| 139 | |||
| 140 | //------------------------------------------------ | ||
| 141 | // | ||
| 142 | // params_iter_base | ||
| 143 | // | ||
| 144 | //------------------------------------------------ | ||
| 145 | |||
| 146 | struct params_iter_base | ||
| 147 | { | ||
| 148 | protected: | ||
| 149 | // return encoded size | ||
| 150 | BOOST_URL_DECL | ||
| 151 | static | ||
| 152 | void | ||
| 153 | measure_impl( | ||
| 154 | std::size_t& n, | ||
| 155 | param_view const& p) noexcept; | ||
| 156 | |||
| 157 | // encode to dest | ||
| 158 | BOOST_URL_DECL | ||
| 159 | static | ||
| 160 | void | ||
| 161 | copy_impl( | ||
| 162 | char*& dest, | ||
| 163 | char const* end, | ||
| 164 | param_view const& v) noexcept; | ||
| 165 | }; | ||
| 166 | |||
| 167 | //------------------------------------------------ | ||
| 168 | |||
| 169 | // A range of plain query params_ref | ||
| 170 | template<class FwdIt> | ||
| 171 | struct params_iter | ||
| 172 | : any_params_iter | ||
| 173 | , private params_iter_base | ||
| 174 | { | ||
| 175 | BOOST_STATIC_ASSERT( | ||
| 176 | std::is_convertible< | ||
| 177 | typename std::iterator_traits< | ||
| 178 | FwdIt>::reference, | ||
| 179 | param_view>::value); | ||
| 180 | |||
| 181 | 33 | params_iter( | |
| 182 | FwdIt first, | ||
| 183 | FwdIt last) noexcept | ||
| 184 | : any_params_iter( | ||
| 185 | 2 | first == last) | |
| 186 | 33 | , it0_(first) | |
| 187 | 33 | , it_(first) | |
| 188 | 35 | , end_(last) | |
| 189 | { | ||
| 190 | 33 | } | |
| 191 | |||
| 192 | private: | ||
| 193 | FwdIt it0_; | ||
| 194 | FwdIt it_; | ||
| 195 | FwdIt end_; | ||
| 196 | |||
| 197 | void | ||
| 198 | 33 | rewind() noexcept override | |
| 199 | { | ||
| 200 | 33 | it_ = it0_; | |
| 201 | 33 | } | |
| 202 | |||
| 203 | bool | ||
| 204 | 103 | measure( | |
| 205 | std::size_t& n) noexcept override | ||
| 206 | { | ||
| 207 |
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103 | if(it_ == end_) |
| 208 | 33 | return false; | |
| 209 | 70 | measure_impl(n, | |
| 210 | 72 | param_view(*it_++)); | |
| 211 | 70 | return true; | |
| 212 | } | ||
| 213 | |||
| 214 | void | ||
| 215 | 70 | copy( | |
| 216 | char*& dest, | ||
| 217 | char const* end) noexcept override | ||
| 218 | { | ||
| 219 | 70 | copy_impl(dest, end, | |
| 220 | 72 | param_view(*it_++)); | |
| 221 | 70 | } | |
| 222 | }; | ||
| 223 | |||
| 224 | //------------------------------------------------ | ||
| 225 | // | ||
| 226 | // param_encoded_iter | ||
| 227 | // | ||
| 228 | //------------------------------------------------ | ||
| 229 | |||
| 230 | // A 1-param encoded range | ||
| 231 | // allowing self-intersection | ||
| 232 | struct BOOST_SYMBOL_VISIBLE | ||
| 233 | param_encoded_iter | ||
| 234 | : any_params_iter | ||
| 235 | { | ||
| 236 | explicit | ||
| 237 | param_encoded_iter( | ||
| 238 | param_pct_view const&) noexcept; | ||
| 239 | |||
| 240 | private: | ||
| 241 | bool has_value_; | ||
| 242 | bool at_end_ = false; | ||
| 243 | |||
| 244 | void rewind() noexcept override; | ||
| 245 | bool measure(std::size_t&) noexcept override; | ||
| 246 | void copy(char*&, char const*) noexcept override; | ||
| 247 | }; | ||
| 248 | |||
| 249 | //------------------------------------------------ | ||
| 250 | // | ||
| 251 | // params_encoded_iter | ||
| 252 | // | ||
| 253 | //------------------------------------------------ | ||
| 254 | |||
| 255 | // Validating and copying from | ||
| 256 | // a string of encoded params | ||
| 257 | struct params_encoded_iter_base | ||
| 258 | { | ||
| 259 | protected: | ||
| 260 | BOOST_URL_DECL | ||
| 261 | static | ||
| 262 | void | ||
| 263 | measure_impl( | ||
| 264 | std::size_t& n, | ||
| 265 | param_view const& v) noexcept; | ||
| 266 | |||
| 267 | BOOST_URL_DECL | ||
| 268 | static | ||
| 269 | void | ||
| 270 | copy_impl( | ||
| 271 | char*& dest, | ||
| 272 | char const* end, | ||
| 273 | param_view const& v) noexcept; | ||
| 274 | }; | ||
| 275 | |||
| 276 | //------------------------------------------------ | ||
| 277 | |||
| 278 | // A range of encoded query params_ref | ||
| 279 | template<class FwdIt> | ||
| 280 | struct params_encoded_iter | ||
| 281 | : any_params_iter | ||
| 282 | , private params_encoded_iter_base | ||
| 283 | { | ||
| 284 | BOOST_STATIC_ASSERT( | ||
| 285 | std::is_convertible< | ||
| 286 | typename std::iterator_traits< | ||
| 287 | FwdIt>::reference, | ||
| 288 | param_view>::value); | ||
| 289 | |||
| 290 | 48 | params_encoded_iter( | |
| 291 | FwdIt first, | ||
| 292 | FwdIt last) noexcept | ||
| 293 | : any_params_iter( | ||
| 294 | 2 | first == last) | |
| 295 | 48 | , it0_(first) | |
| 296 | 48 | , it_(first) | |
| 297 | 50 | , end_(last) | |
| 298 | { | ||
| 299 | 48 | } | |
| 300 | |||
| 301 | private: | ||
| 302 | FwdIt it0_; | ||
| 303 | FwdIt it_; | ||
| 304 | FwdIt end_; | ||
| 305 | |||
| 306 | void | ||
| 307 | 43 | rewind() noexcept override | |
| 308 | { | ||
| 309 | 43 | it_ = it0_; | |
| 310 | 43 | } | |
| 311 | |||
| 312 | bool | ||
| 313 | 137 | measure( | |
| 314 | std::size_t& n) override | ||
| 315 | { | ||
| 316 |
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137 | if(it_ == end_) |
| 317 | 43 | return false; | |
| 318 | // throw on invalid input | ||
| 319 | 89 | measure_impl(n, | |
| 320 |
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107 | param_pct_view( |
| 321 |
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94 | param_view(*it_++))); |
| 322 | 89 | return true; | |
| 323 | } | ||
| 324 | |||
| 325 | void | ||
| 326 | 89 | copy( | |
| 327 | char*& dest, | ||
| 328 | char const* end | ||
| 329 | ) noexcept override | ||
| 330 | { | ||
| 331 | 89 | copy_impl(dest, end, | |
| 332 | 89 | param_view(*it_++)); | |
| 333 | 89 | } | |
| 334 | }; | ||
| 335 | |||
| 336 | //------------------------------------------------ | ||
| 337 | // | ||
| 338 | // param_value_iter | ||
| 339 | // | ||
| 340 | //------------------------------------------------ | ||
| 341 | |||
| 342 | // An iterator which outputs | ||
| 343 | // one value on an existing key | ||
| 344 | struct param_value_iter | ||
| 345 | : any_params_iter | ||
| 346 | { | ||
| 347 | 9 | param_value_iter( | |
| 348 | std::size_t nk, | ||
| 349 | core::string_view const& value, | ||
| 350 | bool has_value) noexcept | ||
| 351 | 9 | : any_params_iter( | |
| 352 | false, | ||
| 353 | value) | ||
| 354 | 9 | , nk_(nk) | |
| 355 | 9 | , has_value_(has_value) | |
| 356 | { | ||
| 357 | 9 | } | |
| 358 | |||
| 359 | private: | ||
| 360 | std::size_t nk_ = 0; | ||
| 361 | bool has_value_ = false; | ||
| 362 | bool at_end_ = false; | ||
| 363 | |||
| 364 | void rewind() noexcept override; | ||
| 365 | bool measure(std::size_t&) noexcept override; | ||
| 366 | void copy(char*&, char const*) noexcept override; | ||
| 367 | }; | ||
| 368 | |||
| 369 | //------------------------------------------------ | ||
| 370 | // | ||
| 371 | // param_encoded_value_iter | ||
| 372 | // | ||
| 373 | //------------------------------------------------ | ||
| 374 | |||
| 375 | // An iterator which outputs one | ||
| 376 | // encoded value on an existing key | ||
| 377 | struct param_encoded_value_iter | ||
| 378 | : any_params_iter | ||
| 379 | { | ||
| 380 | 8 | param_encoded_value_iter( | |
| 381 | std::size_t nk, | ||
| 382 | pct_string_view const& value, | ||
| 383 | bool has_value) noexcept | ||
| 384 | 8 | : any_params_iter( | |
| 385 | false, | ||
| 386 | value) | ||
| 387 | 8 | , nk_(nk) | |
| 388 | 8 | , has_value_(has_value) | |
| 389 | { | ||
| 390 | 8 | } | |
| 391 | |||
| 392 | private: | ||
| 393 | std::size_t nk_ = 0; | ||
| 394 | bool has_value_ = false; | ||
| 395 | bool at_end_ = false; | ||
| 396 | |||
| 397 | void rewind() noexcept override; | ||
| 398 | bool measure(std::size_t&) noexcept override; | ||
| 399 | void copy(char*&, char const*) noexcept override; | ||
| 400 | }; | ||
| 401 | |||
| 402 | //------------------------------------------------ | ||
| 403 | |||
| 404 | template<class FwdIt> | ||
| 405 | params_iter<FwdIt> | ||
| 406 | 31 | make_params_iter( | |
| 407 | FwdIt first, FwdIt last) | ||
| 408 | { | ||
| 409 | return params_iter< | ||
| 410 | 31 | FwdIt>(first, last); | |
| 411 | } | ||
| 412 | |||
| 413 | template<class FwdIt> | ||
| 414 | params_encoded_iter<FwdIt> | ||
| 415 | 29 | make_params_encoded_iter( | |
| 416 | FwdIt first, FwdIt last) | ||
| 417 | { | ||
| 418 | return params_encoded_iter< | ||
| 419 | 29 | FwdIt>(first, last); | |
| 420 | } | ||
| 421 | |||
| 422 | } // detail | ||
| 423 | } // urls | ||
| 424 | } // boost | ||
| 425 | |||
| 426 | #endif | ||
| 427 |