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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // Copyright (c) 2020 Krystian Stasiowski (sdkrystian@gmail.com) | ||
| 4 | // | ||
| 5 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 6 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 7 | // | ||
| 8 | // Official repository: https://github.com/boostorg/json | ||
| 9 | // | ||
| 10 | |||
| 11 | #ifndef BOOST_JSON_DETAIL_STRING_IMPL_HPP | ||
| 12 | #define BOOST_JSON_DETAIL_STRING_IMPL_HPP | ||
| 13 | |||
| 14 | #include <boost/core/detail/static_assert.hpp> | ||
| 15 | #include <boost/json/detail/config.hpp> | ||
| 16 | #include <boost/json/kind.hpp> | ||
| 17 | #include <boost/json/storage_ptr.hpp> | ||
| 18 | #include <boost/json/detail/value.hpp> | ||
| 19 | #include <algorithm> | ||
| 20 | #include <iterator> | ||
| 21 | |||
| 22 | namespace boost { | ||
| 23 | namespace json { | ||
| 24 | |||
| 25 | class value; | ||
| 26 | class string; | ||
| 27 | |||
| 28 | namespace detail { | ||
| 29 | |||
| 30 | class string_impl | ||
| 31 | { | ||
| 32 | struct table | ||
| 33 | { | ||
| 34 | std::uint32_t size; | ||
| 35 | std::uint32_t capacity; | ||
| 36 | }; | ||
| 37 | |||
| 38 | #if BOOST_JSON_ARCH == 64 | ||
| 39 | static constexpr std::size_t sbo_chars_ = 14; | ||
| 40 | #elif BOOST_JSON_ARCH == 32 | ||
| 41 | static constexpr std::size_t sbo_chars_ = 10; | ||
| 42 | #else | ||
| 43 | # error Unknown architecture | ||
| 44 | #endif | ||
| 45 | |||
| 46 | static | ||
| 47 | constexpr | ||
| 48 | kind | ||
| 49 | short_string_ = | ||
| 50 | static_cast<kind>( | ||
| 51 | ((unsigned char) | ||
| 52 | kind::string) | 0x80); | ||
| 53 | |||
| 54 | static | ||
| 55 | constexpr | ||
| 56 | kind | ||
| 57 | key_string_ = | ||
| 58 | static_cast<kind>( | ||
| 59 | ((unsigned char) | ||
| 60 | kind::string) | 0x40); | ||
| 61 | |||
| 62 | struct sbo | ||
| 63 | { | ||
| 64 | kind k; // must come first | ||
| 65 | char buf[sbo_chars_ + 1]; | ||
| 66 | }; | ||
| 67 | |||
| 68 | struct pointer | ||
| 69 | { | ||
| 70 | kind k; // must come first | ||
| 71 | table* t; | ||
| 72 | }; | ||
| 73 | |||
| 74 | struct key | ||
| 75 | { | ||
| 76 | kind k; // must come first | ||
| 77 | std::uint32_t n; | ||
| 78 | char* s; | ||
| 79 | }; | ||
| 80 | |||
| 81 | union | ||
| 82 | { | ||
| 83 | sbo s_; | ||
| 84 | pointer p_; | ||
| 85 | key k_; | ||
| 86 | }; | ||
| 87 | |||
| 88 | #if BOOST_JSON_ARCH == 64 | ||
| 89 | BOOST_CORE_STATIC_ASSERT( sizeof(sbo) <= 16 ); | ||
| 90 | BOOST_CORE_STATIC_ASSERT( sizeof(pointer) <= 16 ); | ||
| 91 | BOOST_CORE_STATIC_ASSERT( sizeof(key) <= 16 ); | ||
| 92 | #elif BOOST_JSON_ARCH == 32 | ||
| 93 | BOOST_CORE_STATIC_ASSERT( sizeof(sbo) <= 24 ); | ||
| 94 | BOOST_CORE_STATIC_ASSERT( sizeof(pointer) <= 24 ); | ||
| 95 | BOOST_CORE_STATIC_ASSERT( sizeof(key) <= 24 ); | ||
| 96 | #endif | ||
| 97 | |||
| 98 | public: | ||
| 99 | static | ||
| 100 | constexpr | ||
| 101 | std::size_t | ||
| 102 | 153977 | max_size() noexcept | |
| 103 | { | ||
| 104 | // max_size depends on the address model | ||
| 105 | using min = std::integral_constant<std::size_t, | ||
| 106 | std::size_t(-1) - sizeof(table)>; | ||
| 107 | return min::value < BOOST_JSON_MAX_STRING_SIZE ? | ||
| 108 | 153977 | min::value : BOOST_JSON_MAX_STRING_SIZE; | |
| 109 | } | ||
| 110 | |||
| 111 | BOOST_JSON_DECL | ||
| 112 | string_impl() noexcept; | ||
| 113 | |||
| 114 | BOOST_JSON_DECL | ||
| 115 | string_impl( | ||
| 116 | std::size_t new_size, | ||
| 117 | storage_ptr const& sp); | ||
| 118 | |||
| 119 | BOOST_JSON_DECL | ||
| 120 | string_impl( | ||
| 121 | key_t, | ||
| 122 | string_view s, | ||
| 123 | storage_ptr const& sp); | ||
| 124 | |||
| 125 | BOOST_JSON_DECL | ||
| 126 | string_impl( | ||
| 127 | key_t, | ||
| 128 | string_view s1, | ||
| 129 | string_view s2, | ||
| 130 | storage_ptr const& sp); | ||
| 131 | |||
| 132 | BOOST_JSON_DECL | ||
| 133 | string_impl( | ||
| 134 | char** dest, | ||
| 135 | std::size_t len, | ||
| 136 | storage_ptr const& sp); | ||
| 137 | |||
| 138 | template<class InputIt> | ||
| 139 | 16 | string_impl( | |
| 140 | InputIt first, | ||
| 141 | InputIt last, | ||
| 142 | storage_ptr const& sp, | ||
| 143 | std::random_access_iterator_tag) | ||
| 144 | 16 | : string_impl(last - first, sp) | |
| 145 | { | ||
| 146 | 14 | char* out = data(); | |
| 147 | #if defined(_MSC_VER) && _MSC_VER <= 1900 | ||
| 148 | while( first != last ) | ||
| 149 | *out++ = *first++; | ||
| 150 | #else | ||
| 151 | 14 | std::copy(first, last, out); | |
| 152 | #endif | ||
| 153 | 14 | } | |
| 154 | |||
| 155 | template<class InputIt> | ||
| 156 | 55 | string_impl( | |
| 157 | InputIt first, | ||
| 158 | InputIt last, | ||
| 159 | storage_ptr const& sp, | ||
| 160 | std::input_iterator_tag) | ||
| 161 | 55 | : string_impl(0, sp) | |
| 162 | { | ||
| 163 | struct undo | ||
| 164 | { | ||
| 165 | string_impl* s; | ||
| 166 | storage_ptr const& sp; | ||
| 167 | |||
| 168 | 38 | ~undo() | |
| 169 | { | ||
| 170 |
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38 | if(s) |
| 171 | 3 | s->destroy(sp); | |
| 172 | 38 | } | |
| 173 | }; | ||
| 174 | |||
| 175 | 55 | undo u{this, sp}; | |
| 176 | 55 | auto dest = data(); | |
| 177 |
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576 | while(first != last) |
| 178 | { | ||
| 179 |
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527 | if(size() < capacity()) |
| 180 | 505 | size(size() + 1); | |
| 181 | else | ||
| 182 |
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22 | dest = append(1, sp); |
| 183 | 521 | *dest++ = *first++; | |
| 184 | } | ||
| 185 | 49 | term(size()); | |
| 186 | 49 | u.s = nullptr; | |
| 187 | 55 | } | |
| 188 | |||
| 189 | std::size_t | ||
| 190 | 99013 | size() const noexcept | |
| 191 | { | ||
| 192 |
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99013 | return s_.k == kind::string ? |
| 193 | 64299 | p_.t->size : | |
| 194 | sbo_chars_ - | ||
| 195 | 99013 | s_.buf[sbo_chars_]; | |
| 196 | } | ||
| 197 | |||
| 198 | std::size_t | ||
| 199 | 91989 | capacity() const noexcept | |
| 200 | { | ||
| 201 |
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91989 | return s_.k == kind::string ? |
| 202 | 11708 | p_.t->capacity : | |
| 203 | 91989 | sbo_chars_; | |
| 204 | } | ||
| 205 | |||
| 206 | void | ||
| 207 | 10015 | size(std::size_t n) | |
| 208 | { | ||
| 209 |
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10015 | if(s_.k == kind::string) |
| 210 | 9733 | p_.t->size = static_cast< | |
| 211 | std::uint32_t>(n); | ||
| 212 | else | ||
| 213 | 282 | s_.buf[sbo_chars_] = | |
| 214 | static_cast<char>( | ||
| 215 | 282 | sbo_chars_ - n); | |
| 216 | 10015 | } | |
| 217 | |||
| 218 | BOOST_JSON_DECL | ||
| 219 | static | ||
| 220 | std::uint32_t | ||
| 221 | growth( | ||
| 222 | std::size_t new_size, | ||
| 223 | std::size_t capacity); | ||
| 224 | |||
| 225 | char const* | ||
| 226 | 38261 | release_key( | |
| 227 | std::size_t& n) noexcept | ||
| 228 | { | ||
| 229 |
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38261 | BOOST_ASSERT( |
| 230 | k_.k == key_string_); | ||
| 231 | 38261 | n = k_.n; | |
| 232 | 38261 | auto const s = k_.s; | |
| 233 | // prevent deallocate | ||
| 234 | 38261 | k_.k = short_string_; | |
| 235 | 38261 | return s; | |
| 236 | } | ||
| 237 | |||
| 238 | void | ||
| 239 | 57764 | destroy( | |
| 240 | storage_ptr const& sp) noexcept | ||
| 241 | { | ||
| 242 |
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57764 | if(s_.k == kind::string) |
| 243 | { | ||
| 244 | 26671 | sp->deallocate(p_.t, | |
| 245 | sizeof(table) + | ||
| 246 | 26671 | p_.t->capacity + 1, | |
| 247 | alignof(table)); | ||
| 248 | } | ||
| 249 |
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31093 | else if(s_.k != key_string_) |
| 250 | { | ||
| 251 | // do nothing | ||
| 252 | } | ||
| 253 | else | ||
| 254 | { | ||
| 255 |
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146 | BOOST_ASSERT( |
| 256 | s_.k == key_string_); | ||
| 257 | // VFALCO unfortunately the key string | ||
| 258 | // kind increases the cost of the destructor. | ||
| 259 | // This function should be skipped when using | ||
| 260 | // monotonic_resource. | ||
| 261 | 146 | sp->deallocate(k_.s, k_.n + 1); | |
| 262 | } | ||
| 263 | 57764 | } | |
| 264 | |||
| 265 | BOOST_JSON_DECL | ||
| 266 | char* | ||
| 267 | assign( | ||
| 268 | std::size_t new_size, | ||
| 269 | storage_ptr const& sp); | ||
| 270 | |||
| 271 | BOOST_JSON_DECL | ||
| 272 | char* | ||
| 273 | append( | ||
| 274 | std::size_t n, | ||
| 275 | storage_ptr const& sp); | ||
| 276 | |||
| 277 | BOOST_JSON_DECL | ||
| 278 | void | ||
| 279 | insert( | ||
| 280 | std::size_t pos, | ||
| 281 | const char* s, | ||
| 282 | std::size_t n, | ||
| 283 | storage_ptr const& sp); | ||
| 284 | |||
| 285 | BOOST_JSON_DECL | ||
| 286 | char* | ||
| 287 | insert_unchecked( | ||
| 288 | std::size_t pos, | ||
| 289 | std::size_t n, | ||
| 290 | storage_ptr const& sp); | ||
| 291 | |||
| 292 | BOOST_JSON_DECL | ||
| 293 | void | ||
| 294 | replace( | ||
| 295 | std::size_t pos, | ||
| 296 | std::size_t n1, | ||
| 297 | const char* s, | ||
| 298 | std::size_t n2, | ||
| 299 | storage_ptr const& sp); | ||
| 300 | |||
| 301 | BOOST_JSON_DECL | ||
| 302 | char* | ||
| 303 | replace_unchecked( | ||
| 304 | std::size_t pos, | ||
| 305 | std::size_t n1, | ||
| 306 | std::size_t n2, | ||
| 307 | storage_ptr const& sp); | ||
| 308 | |||
| 309 | BOOST_JSON_DECL | ||
| 310 | void | ||
| 311 | shrink_to_fit( | ||
| 312 | storage_ptr const& sp) noexcept; | ||
| 313 | |||
| 314 | void | ||
| 315 | 33679 | term(std::size_t n) noexcept | |
| 316 | { | ||
| 317 |
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33679 | if(s_.k == short_string_) |
| 318 | { | ||
| 319 | 5254 | s_.buf[sbo_chars_] = | |
| 320 | static_cast<char>( | ||
| 321 | 5254 | sbo_chars_ - n); | |
| 322 | 5254 | s_.buf[n] = 0; | |
| 323 | } | ||
| 324 | else | ||
| 325 | { | ||
| 326 | 28425 | p_.t->size = static_cast< | |
| 327 | std::uint32_t>(n); | ||
| 328 | 28425 | data()[n] = 0; | |
| 329 | } | ||
| 330 | 33679 | } | |
| 331 | |||
| 332 | char* | ||
| 333 | 117397 | data() noexcept | |
| 334 | { | ||
| 335 |
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117397 | if(s_.k == short_string_) |
| 336 | 15491 | return s_.buf; | |
| 337 | return reinterpret_cast< | ||
| 338 | 101906 | char*>(p_.t + 1); | |
| 339 | } | ||
| 340 | |||
| 341 | char const* | ||
| 342 | 44124 | data() const noexcept | |
| 343 | { | ||
| 344 |
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44124 | if(s_.k == short_string_) |
| 345 | 4669 | return s_.buf; | |
| 346 | return reinterpret_cast< | ||
| 347 | 39455 | char const*>(p_.t + 1); | |
| 348 | } | ||
| 349 | |||
| 350 | char* | ||
| 351 | 175 | end() noexcept | |
| 352 | { | ||
| 353 | 175 | return data() + size(); | |
| 354 | } | ||
| 355 | |||
| 356 | char const* | ||
| 357 | 10 | end() const noexcept | |
| 358 | { | ||
| 359 | 10 | return data() + size(); | |
| 360 | } | ||
| 361 | }; | ||
| 362 | |||
| 363 | template<class T> | ||
| 364 | string_view | ||
| 365 | 2481 | to_string_view(T const& t) noexcept | |
| 366 | { | ||
| 367 | 2481 | return string_view(t); | |
| 368 | } | ||
| 369 | |||
| 370 | template<class T, class U> | ||
| 371 | using string_and_stringlike = std::integral_constant<bool, | ||
| 372 | std::is_same<T, string>::value && | ||
| 373 | std::is_convertible<U const&, string_view>::value>; | ||
| 374 | |||
| 375 | template<class T, class U> | ||
| 376 | using string_comp_op_requirement | ||
| 377 | = typename std::enable_if< | ||
| 378 | string_and_stringlike<T, U>::value || | ||
| 379 | string_and_stringlike<U, T>::value, | ||
| 380 | bool>::type; | ||
| 381 | |||
| 382 | } // detail | ||
| 383 | } // namespace json | ||
| 384 | } // namespace boost | ||
| 385 | |||
| 386 | #endif | ||
| 387 |