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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 | // Copyright (c) 2021 Dmitry Arkhipov (grisumbras@gmail.com) | ||
| 5 | // | ||
| 6 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 7 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 8 | // | ||
| 9 | // Official repository: https://github.com/boostorg/json | ||
| 10 | // | ||
| 11 | |||
| 12 | #ifndef BOOST_JSON_DETAIL_VALUE_TO_HPP | ||
| 13 | #define BOOST_JSON_DETAIL_VALUE_TO_HPP | ||
| 14 | |||
| 15 | #include <boost/core/detail/static_assert.hpp> | ||
| 16 | #include <boost/json/value.hpp> | ||
| 17 | #include <boost/json/conversion.hpp> | ||
| 18 | #include <boost/json/result_for.hpp> | ||
| 19 | #include <boost/describe/enum_from_string.hpp> | ||
| 20 | |||
| 21 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 22 | # include <optional> | ||
| 23 | #endif | ||
| 24 | |||
| 25 | namespace boost { | ||
| 26 | namespace json { | ||
| 27 | |||
| 28 | namespace detail { | ||
| 29 | |||
| 30 | template<class T> | ||
| 31 | using has_reserve_member_helper = decltype(std::declval<T&>().reserve(0)); | ||
| 32 | template<class T> | ||
| 33 | using has_reserve_member = mp11::mp_valid<has_reserve_member_helper, T>; | ||
| 34 | template<class T> | ||
| 35 | using reserve_implementation = mp11::mp_cond< | ||
| 36 | is_tuple_like<T>, mp11::mp_int<2>, | ||
| 37 | has_reserve_member<T>, mp11::mp_int<1>, | ||
| 38 | mp11::mp_true, mp11::mp_int<0>>; | ||
| 39 | |||
| 40 | template<class T> | ||
| 41 | error | ||
| 42 | 78 | try_reserve( | |
| 43 | T&, | ||
| 44 | std::size_t size, | ||
| 45 | mp11::mp_int<2>) | ||
| 46 | { | ||
| 47 | 78 | constexpr std::size_t N = std::tuple_size<remove_cvref<T>>::value; | |
| 48 |
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78 | if ( N != size ) |
| 49 | 60 | return error::size_mismatch; | |
| 50 | 18 | return error(); | |
| 51 | } | ||
| 52 | |||
| 53 | template<typename T> | ||
| 54 | error | ||
| 55 | 147 | try_reserve( | |
| 56 | T& cont, | ||
| 57 | std::size_t size, | ||
| 58 | mp11::mp_int<1>) | ||
| 59 | { | ||
| 60 | 147 | cont.reserve(size); | |
| 61 | 147 | return error(); | |
| 62 | } | ||
| 63 | |||
| 64 | template<typename T> | ||
| 65 | error | ||
| 66 | 114 | try_reserve( | |
| 67 | T&, | ||
| 68 | std::size_t, | ||
| 69 | mp11::mp_int<0>) | ||
| 70 | { | ||
| 71 | 114 | return error(); | |
| 72 | } | ||
| 73 | |||
| 74 | |||
| 75 | // identity conversion | ||
| 76 | template< class Ctx > | ||
| 77 | system::result<value> | ||
| 78 | value_to_impl( | ||
| 79 | value_conversion_tag, | ||
| 80 | try_value_to_tag<value>, | ||
| 81 | value const& jv, | ||
| 82 | Ctx const& ) | ||
| 83 | { | ||
| 84 | return jv; | ||
| 85 | } | ||
| 86 | |||
| 87 | template< class Ctx > | ||
| 88 | value | ||
| 89 | value_to_impl( | ||
| 90 | value_conversion_tag, value_to_tag<value>, value const& jv, Ctx const& ) | ||
| 91 | { | ||
| 92 | return jv; | ||
| 93 | } | ||
| 94 | |||
| 95 | // object | ||
| 96 | template< class Ctx > | ||
| 97 | system::result<object> | ||
| 98 | 24 | value_to_impl( | |
| 99 | object_conversion_tag, | ||
| 100 | try_value_to_tag<object>, | ||
| 101 | value const& jv, | ||
| 102 | Ctx const& ) | ||
| 103 | { | ||
| 104 | 24 | object const* obj = jv.if_object(); | |
| 105 |
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24 | if( obj ) |
| 106 |
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12 | return *obj; |
| 107 | 12 | system::error_code ec; | |
| 108 | 12 | BOOST_JSON_FAIL(ec, error::not_object); | |
| 109 | 12 | return ec; | |
| 110 | } | ||
| 111 | |||
| 112 | // array | ||
| 113 | template< class Ctx > | ||
| 114 | system::result<array> | ||
| 115 | 24 | value_to_impl( | |
| 116 | array_conversion_tag, | ||
| 117 | try_value_to_tag<array>, | ||
| 118 | value const& jv, | ||
| 119 | Ctx const& ) | ||
| 120 | { | ||
| 121 | 24 | array const* arr = jv.if_array(); | |
| 122 |
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24 | if( arr ) |
| 123 |
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12 | return *arr; |
| 124 | 12 | system::error_code ec; | |
| 125 | 12 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 126 | 12 | return ec; | |
| 127 | } | ||
| 128 | |||
| 129 | // string | ||
| 130 | template< class Ctx > | ||
| 131 | system::result<string> | ||
| 132 | 24 | value_to_impl( | |
| 133 | string_conversion_tag, | ||
| 134 | try_value_to_tag<string>, | ||
| 135 | value const& jv, | ||
| 136 | Ctx const& ) | ||
| 137 | { | ||
| 138 | 24 | string const* str = jv.if_string(); | |
| 139 |
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24 | if( str ) |
| 140 |
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12 | return *str; |
| 141 | 12 | system::error_code ec; | |
| 142 | 12 | BOOST_JSON_FAIL(ec, error::not_string); | |
| 143 | 12 | return ec; | |
| 144 | } | ||
| 145 | |||
| 146 | // bool | ||
| 147 | template< class Ctx > | ||
| 148 | system::result<bool> | ||
| 149 | 91 | value_to_impl( | |
| 150 | bool_conversion_tag, try_value_to_tag<bool>, value const& jv, Ctx const& ) | ||
| 151 | { | ||
| 152 | 91 | auto b = jv.if_bool(); | |
| 153 |
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91 | if( b ) |
| 154 | 78 | return *b; | |
| 155 | 13 | system::error_code ec; | |
| 156 | 13 | BOOST_JSON_FAIL(ec, error::not_bool); | |
| 157 | 13 | return {boost::system::in_place_error, ec}; | |
| 158 | } | ||
| 159 | |||
| 160 | // integral and floating point | ||
| 161 | template< class T, class Ctx > | ||
| 162 | system::result<T> | ||
| 163 | 6788 | value_to_impl( | |
| 164 | number_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 165 | { | ||
| 166 | 6788 | system::error_code ec; | |
| 167 | 6788 | auto const n = jv.to_number<T>(ec); | |
| 168 |
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6788 | if( ec.failed() ) |
| 169 | 110 | return {boost::system::in_place_error, ec}; | |
| 170 | 6678 | return {boost::system::in_place_value, n}; | |
| 171 | } | ||
| 172 | |||
| 173 | // null-like conversion | ||
| 174 | template< class T, class Ctx > | ||
| 175 | system::result<T> | ||
| 176 | 112 | value_to_impl( | |
| 177 | null_like_conversion_tag, | ||
| 178 | try_value_to_tag<T>, | ||
| 179 | value const& jv, | ||
| 180 | Ctx const& ) | ||
| 181 | { | ||
| 182 |
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112 | if( jv.is_null() ) |
| 183 | 70 | return {boost::system::in_place_value, T{}}; | |
| 184 | 42 | system::error_code ec; | |
| 185 | 42 | BOOST_JSON_FAIL(ec, error::not_null); | |
| 186 | 42 | return {boost::system::in_place_error, ec}; | |
| 187 | } | ||
| 188 | |||
| 189 | // string-like types | ||
| 190 | template< class T, class Ctx > | ||
| 191 | system::result<T> | ||
| 192 | 145 | value_to_impl( | |
| 193 | string_like_conversion_tag, | ||
| 194 | try_value_to_tag<T>, | ||
| 195 | value const& jv, | ||
| 196 | Ctx const& ) | ||
| 197 | { | ||
| 198 | 145 | auto str = jv.if_string(); | |
| 199 |
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145 | if( str ) |
| 200 |
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121 | return {boost::system::in_place_value, T(str->subview())}; |
| 201 | 24 | system::error_code ec; | |
| 202 | 24 | BOOST_JSON_FAIL(ec, error::not_string); | |
| 203 | 24 | return {boost::system::in_place_error, ec}; | |
| 204 | } | ||
| 205 | |||
| 206 | // map-like containers | ||
| 207 | template< class T, class Ctx > | ||
| 208 | system::result<T> | ||
| 209 | 148 | value_to_impl( | |
| 210 | map_like_conversion_tag, | ||
| 211 | try_value_to_tag<T>, | ||
| 212 | value const& jv, | ||
| 213 | Ctx const& ctx ) | ||
| 214 | { | ||
| 215 | 148 | object const* obj = jv.if_object(); | |
| 216 |
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148 | if( !obj ) |
| 217 | { | ||
| 218 | 24 | system::error_code ec; | |
| 219 | 24 | BOOST_JSON_FAIL(ec, error::not_object); | |
| 220 | 24 | return {boost::system::in_place_error, ec}; | |
| 221 | } | ||
| 222 | |||
| 223 |
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124 | T res; |
| 224 |
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124 | error const e = detail::try_reserve( |
| 225 | res, obj->size(), reserve_implementation<T>()); | ||
| 226 |
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124 | if( e != error() ) |
| 227 | { | ||
| 228 | 24 | system::error_code ec; | |
| 229 | 24 | BOOST_JSON_FAIL( ec, e ); | |
| 230 | 24 | return {boost::system::in_place_error, ec}; | |
| 231 | } | ||
| 232 | |||
| 233 |
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100 | auto ins = detail::inserter(res, inserter_implementation<T>()); |
| 234 |
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294 | for( key_value_pair const& kv: *obj ) |
| 235 | { | ||
| 236 |
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208 | auto elem_res = try_value_to<mapped_type<T>>( kv.value(), ctx ); |
| 237 |
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208 | if( elem_res.has_error() ) |
| 238 | 26 | return {boost::system::in_place_error, elem_res.error()}; | |
| 239 |
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182 | *ins++ = value_type<T>{ |
| 240 |
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364 | key_type<T>(kv.key()), |
| 241 | 182 | std::move(*elem_res)}; | |
| 242 | } | ||
| 243 | 74 | return res; | |
| 244 | 124 | } | |
| 245 | |||
| 246 | // all other containers | ||
| 247 | template< class T, class Ctx > | ||
| 248 | system::result<T> | ||
| 249 | 237 | value_to_impl( | |
| 250 | sequence_conversion_tag, | ||
| 251 | try_value_to_tag<T>, | ||
| 252 | value const& jv, | ||
| 253 | Ctx const& ctx ) | ||
| 254 | { | ||
| 255 | 237 | array const* arr = jv.if_array(); | |
| 256 |
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237 | if( !arr ) |
| 257 | { | ||
| 258 | 24 | system::error_code ec; | |
| 259 | 24 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 260 | 24 | return {boost::system::in_place_error, ec}; | |
| 261 | } | ||
| 262 | |||
| 263 | 157 | T result; | |
| 264 |
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213 | error const e = detail::try_reserve( |
| 265 | result, arr->size(), reserve_implementation<T>()); | ||
| 266 |
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213 | if( e != error() ) |
| 267 | { | ||
| 268 | 36 | system::error_code ec; | |
| 269 | 36 | BOOST_JSON_FAIL( ec, e ); | |
| 270 | 36 | return {boost::system::in_place_error, ec}; | |
| 271 | } | ||
| 272 | |||
| 273 |
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177 | auto ins = detail::inserter(result, inserter_implementation<T>()); |
| 274 |
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6683 | for( value const& val: *arr ) |
| 275 | { | ||
| 276 |
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6454 | auto elem_res = try_value_to<value_type<T>>( val, ctx ); |
| 277 |
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6454 | if( elem_res.has_error() ) |
| 278 | 26 | return {boost::system::in_place_error, elem_res.error()}; | |
| 279 |
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6428 | *ins++ = std::move(*elem_res); |
| 280 | } | ||
| 281 | 151 | return result; | |
| 282 | 157 | } | |
| 283 | |||
| 284 | // tuple-like types | ||
| 285 | template< class T, class Ctx > | ||
| 286 | system::result<T> | ||
| 287 | 456 | try_make_tuple_elem(value const& jv, Ctx const& ctx, system::error_code& ec) | |
| 288 | { | ||
| 289 |
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456 | if( ec.failed() ) |
| 290 | 76 | return {boost::system::in_place_error, ec}; | |
| 291 | |||
| 292 |
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380 | auto result = try_value_to<T>( jv, ctx ); |
| 293 | 380 | ec = result.error(); | |
| 294 | 380 | return result; | |
| 295 | 114 | } | |
| 296 | |||
| 297 | template <class T, class Ctx, std::size_t... Is> | ||
| 298 | system::result<T> | ||
| 299 | 181 | try_make_tuple_like( | |
| 300 | array const& arr, Ctx const& ctx, boost::mp11::index_sequence<Is...>) | ||
| 301 | { | ||
| 302 | 181 | system::error_code ec; | |
| 303 |
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217 | auto items = std::make_tuple( |
| 304 | try_make_tuple_elem< | ||
| 305 |
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221 | typename std::decay<tuple_element_t<Is, T>>::type >( |
| 306 | arr[Is], ctx, ec) | ||
| 307 | ...); | ||
| 308 | #if defined(BOOST_GCC) | ||
| 309 | # pragma GCC diagnostic push | ||
| 310 | # pragma GCC diagnostic ignored "-Wmaybe-uninitialized" | ||
| 311 | #endif | ||
| 312 |
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181 | if( ec.failed() ) |
| 313 | 26 | return {boost::system::in_place_error, ec}; | |
| 314 | #if defined(BOOST_GCC) | ||
| 315 | # pragma GCC diagnostic pop | ||
| 316 | #endif | ||
| 317 | |||
| 318 | return { | ||
| 319 |
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155 | boost::system::in_place_value, T(std::move(*std::get<Is>(items))...)}; |
| 320 | 108 | } | |
| 321 | |||
| 322 | template< class T, class Ctx > | ||
| 323 | system::result<T> | ||
| 324 | 229 | value_to_impl( | |
| 325 | tuple_conversion_tag, | ||
| 326 | try_value_to_tag<T>, | ||
| 327 | value const& jv, | ||
| 328 | Ctx const& ctx ) | ||
| 329 | { | ||
| 330 | 229 | system::error_code ec; | |
| 331 | |||
| 332 | 229 | array const* arr = jv.if_array(); | |
| 333 |
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229 | if( !arr ) |
| 334 | { | ||
| 335 | 24 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 336 | 24 | return {boost::system::in_place_error, ec}; | |
| 337 | } | ||
| 338 | |||
| 339 | 205 | constexpr std::size_t N = std::tuple_size<remove_cvref<T>>::value; | |
| 340 |
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205 | if( N != arr->size() ) |
| 341 | { | ||
| 342 | 24 | BOOST_JSON_FAIL(ec, error::size_mismatch); | |
| 343 | 24 | return {boost::system::in_place_error, ec}; | |
| 344 | } | ||
| 345 | |||
| 346 |
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61 | return try_make_tuple_like<T>( |
| 347 |
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181 | *arr, ctx, boost::mp11::make_index_sequence<N>()); |
| 348 | } | ||
| 349 | |||
| 350 | template< class Ctx, class T > | ||
| 351 | struct to_described_member | ||
| 352 | { | ||
| 353 | static_assert( | ||
| 354 | uniquely_named_members<T>::value, | ||
| 355 | "The type has several described members with the same name."); | ||
| 356 | |||
| 357 | using Ds = described_members<T>; | ||
| 358 | |||
| 359 | system::result<T>& res; | ||
| 360 | object const& obj; | ||
| 361 | Ctx const& ctx; | ||
| 362 | |||
| 363 | template< class I > | ||
| 364 | void | ||
| 365 | operator()(I) | ||
| 366 | { | ||
| 367 | if( !res ) | ||
| 368 | return; | ||
| 369 | |||
| 370 | using D = mp11::mp_at<Ds, I>; | ||
| 371 | using M = described_member_t<T, D>; | ||
| 372 | |||
| 373 | auto const found = obj.find(D::name); | ||
| 374 | if( found == obj.end() ) | ||
| 375 | { | ||
| 376 | BOOST_IF_CONSTEXPR( !is_optional_like<M>::value ) | ||
| 377 | { | ||
| 378 | system::error_code ec; | ||
| 379 | BOOST_JSON_FAIL(ec, error::size_mismatch); | ||
| 380 | res = {boost::system::in_place_error, ec}; | ||
| 381 | } | ||
| 382 | return; | ||
| 383 | } | ||
| 384 | |||
| 385 | #if defined(__GNUC__) && BOOST_GCC_VERSION >= 80000 && BOOST_GCC_VERSION < 11000 | ||
| 386 | # pragma GCC diagnostic push | ||
| 387 | # pragma GCC diagnostic ignored "-Wunused" | ||
| 388 | # pragma GCC diagnostic ignored "-Wunused-variable" | ||
| 389 | #endif | ||
| 390 | auto member_res = try_value_to<M>( found->value(), ctx ); | ||
| 391 | #if defined(__GNUC__) && BOOST_GCC_VERSION >= 80000 && BOOST_GCC_VERSION < 11000 | ||
| 392 | # pragma GCC diagnostic pop | ||
| 393 | #endif | ||
| 394 | if( member_res ) | ||
| 395 | (*res).* D::pointer = std::move(*member_res); | ||
| 396 | else | ||
| 397 | res = {boost::system::in_place_error, member_res.error()}; | ||
| 398 | } | ||
| 399 | }; | ||
| 400 | |||
| 401 | // described classes | ||
| 402 | template< class T, class Ctx > | ||
| 403 | system::result<T> | ||
| 404 | value_to_impl( | ||
| 405 | described_class_conversion_tag, | ||
| 406 | try_value_to_tag<T>, | ||
| 407 | value const& jv, | ||
| 408 | Ctx const& ctx ) | ||
| 409 | { | ||
| 410 | BOOST_CORE_STATIC_ASSERT( std::is_default_constructible<T>::value ); | ||
| 411 | system::result<T> res; | ||
| 412 | |||
| 413 | auto* obj = jv.if_object(); | ||
| 414 | if( !obj ) | ||
| 415 | { | ||
| 416 | system::error_code ec; | ||
| 417 | BOOST_JSON_FAIL(ec, error::not_object); | ||
| 418 | res = {boost::system::in_place_error, ec}; | ||
| 419 | return res; | ||
| 420 | } | ||
| 421 | |||
| 422 | to_described_member<Ctx, T> member_converter{res, *obj, ctx}; | ||
| 423 | |||
| 424 | using Ds = typename decltype(member_converter)::Ds; | ||
| 425 | constexpr std::size_t N = mp11::mp_size<Ds>::value; | ||
| 426 | mp11::mp_for_each< mp11::mp_iota_c<N> >(member_converter); | ||
| 427 | |||
| 428 | if( !res ) | ||
| 429 | return res; | ||
| 430 | |||
| 431 | return res; | ||
| 432 | } | ||
| 433 | |||
| 434 | // described enums | ||
| 435 | template< class T, class Ctx > | ||
| 436 | system::result<T> | ||
| 437 | value_to_impl( | ||
| 438 | described_enum_conversion_tag, | ||
| 439 | try_value_to_tag<T>, | ||
| 440 | value const& jv, | ||
| 441 | Ctx const& ) | ||
| 442 | { | ||
| 443 | T val = {}; | ||
| 444 | (void)jv; | ||
| 445 | #ifdef BOOST_DESCRIBE_CXX14 | ||
| 446 | system::error_code ec; | ||
| 447 | |||
| 448 | auto str = jv.if_string(); | ||
| 449 | if( !str ) | ||
| 450 | { | ||
| 451 | BOOST_JSON_FAIL(ec, error::not_string); | ||
| 452 | return {system::in_place_error, ec}; | ||
| 453 | } | ||
| 454 | |||
| 455 | if( !describe::enum_from_string(str->data(), val) ) | ||
| 456 | { | ||
| 457 | BOOST_JSON_FAIL(ec, error::unknown_name); | ||
| 458 | return {system::in_place_error, ec}; | ||
| 459 | } | ||
| 460 | #endif | ||
| 461 | |||
| 462 | return {system::in_place_value, val}; | ||
| 463 | } | ||
| 464 | |||
| 465 | // optionals | ||
| 466 | template< class T, class Ctx > | ||
| 467 | system::result<T> | ||
| 468 | value_to_impl( | ||
| 469 | optional_conversion_tag, | ||
| 470 | try_value_to_tag<T>, | ||
| 471 | value const& jv, | ||
| 472 | Ctx const& ctx) | ||
| 473 | { | ||
| 474 | using Inner = value_result_type<T>; | ||
| 475 | if( jv.is_null() ) | ||
| 476 | return {}; | ||
| 477 | else | ||
| 478 | return try_value_to<Inner>(jv, ctx); | ||
| 479 | } | ||
| 480 | |||
| 481 | // variants | ||
| 482 | template< class T, class V, class I > | ||
| 483 | using variant_construction_category = mp11::mp_cond< | ||
| 484 | std::is_constructible< T, variant2::in_place_index_t<I::value>, V >, | ||
| 485 | mp11::mp_int<2>, | ||
| 486 | #ifndef BOOST_NO_CXX17_HDR_VARIANT | ||
| 487 | std::is_constructible< T, std::in_place_index_t<I::value>, V >, | ||
| 488 | mp11::mp_int<1>, | ||
| 489 | #endif // BOOST_NO_CXX17_HDR_VARIANT | ||
| 490 | mp11::mp_true, | ||
| 491 | mp11::mp_int<0> >; | ||
| 492 | |||
| 493 | template< class T, class I, class V > | ||
| 494 | T | ||
| 495 | initialize_variant( V&& v, mp11::mp_int<0> ) | ||
| 496 | { | ||
| 497 | T t; | ||
| 498 | t.template emplace<I::value>( std::move(v) ); | ||
| 499 | return t; | ||
| 500 | } | ||
| 501 | |||
| 502 | template< class T, class I, class V > | ||
| 503 | T | ||
| 504 | initialize_variant( V&& v, mp11::mp_int<2> ) | ||
| 505 | { | ||
| 506 | return T( variant2::in_place_index_t<I::value>(), std::move(v) ); | ||
| 507 | } | ||
| 508 | |||
| 509 | #ifndef BOOST_NO_CXX17_HDR_VARIANT | ||
| 510 | template< class T, class I, class V > | ||
| 511 | T | ||
| 512 | initialize_variant( V&& v, mp11::mp_int<1> ) | ||
| 513 | { | ||
| 514 | return T( std::in_place_index_t<I::value>(), std::move(v) ); | ||
| 515 | } | ||
| 516 | #endif // BOOST_NO_CXX17_HDR_VARIANT | ||
| 517 | |||
| 518 | |||
| 519 | template< class T, class Ctx > | ||
| 520 | struct alternative_converter | ||
| 521 | { | ||
| 522 | system::result<T>& res; | ||
| 523 | value const& jv; | ||
| 524 | Ctx const& ctx; | ||
| 525 | |||
| 526 | template< class I > | ||
| 527 | void operator()( I ) const | ||
| 528 | { | ||
| 529 | if( res ) | ||
| 530 | return; | ||
| 531 | |||
| 532 | using V = mp11::mp_at<T, I>; | ||
| 533 | auto attempt = try_value_to<V>(jv, ctx); | ||
| 534 | if( attempt ) | ||
| 535 | { | ||
| 536 | using cat = variant_construction_category<T, V, I>; | ||
| 537 | res = initialize_variant<T, I>( std::move(*attempt), cat() ); | ||
| 538 | } | ||
| 539 | } | ||
| 540 | }; | ||
| 541 | |||
| 542 | template< class T, class Ctx > | ||
| 543 | system::result<T> | ||
| 544 | value_to_impl( | ||
| 545 | variant_conversion_tag, | ||
| 546 | try_value_to_tag<T>, | ||
| 547 | value const& jv, | ||
| 548 | Ctx const& ctx) | ||
| 549 | { | ||
| 550 | system::error_code ec; | ||
| 551 | BOOST_JSON_FAIL(ec, error::exhausted_variants); | ||
| 552 | |||
| 553 | using Is = mp11::mp_iota< mp11::mp_size<T> >; | ||
| 554 | |||
| 555 | system::result<T> res = {system::in_place_error, ec}; | ||
| 556 | mp11::mp_for_each<Is>( alternative_converter<T, Ctx>{res, jv, ctx} ); | ||
| 557 | return res; | ||
| 558 | } | ||
| 559 | |||
| 560 | template< class T, class Ctx > | ||
| 561 | system::result<T> | ||
| 562 | value_to_impl( | ||
| 563 | path_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 564 | { | ||
| 565 | auto str = jv.if_string(); | ||
| 566 | if( !str ) | ||
| 567 | { | ||
| 568 | system::error_code ec; | ||
| 569 | BOOST_JSON_FAIL(ec, error::not_string); | ||
| 570 | return {boost::system::in_place_error, ec}; | ||
| 571 | } | ||
| 572 | |||
| 573 | string_view sv = str->subview(); | ||
| 574 | return {boost::system::in_place_value, T( sv.begin(), sv.end() )}; | ||
| 575 | } | ||
| 576 | |||
| 577 | //---------------------------------------------------------- | ||
| 578 | // User-provided conversions; throwing -> throwing | ||
| 579 | template< class T, class Ctx > | ||
| 580 | mp11::mp_if< mp11::mp_valid<has_user_conversion_to_impl, T>, T > | ||
| 581 | 1 | value_to_impl( | |
| 582 | user_conversion_tag, value_to_tag<T> tag, value const& jv, Ctx const&) | ||
| 583 | { | ||
| 584 | 1 | return tag_invoke(tag, jv); | |
| 585 | } | ||
| 586 | |||
| 587 | template< | ||
| 588 | class T, | ||
| 589 | class Ctx, | ||
| 590 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 591 | > | ||
| 592 | mp11::mp_if< | ||
| 593 | mp11::mp_valid< has_context_conversion_to_impl, typename Sup::type, T>, T > | ||
| 594 | 1 | value_to_impl( | |
| 595 | context_conversion_tag, | ||
| 596 | value_to_tag<T> tag, | ||
| 597 | value const& jv, | ||
| 598 | Ctx const& ctx ) | ||
| 599 | { | ||
| 600 | 1 | return tag_invoke( tag, jv, Sup::get(ctx) ); | |
| 601 | } | ||
| 602 | |||
| 603 | template< | ||
| 604 | class T, | ||
| 605 | class Ctx, | ||
| 606 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 607 | > | ||
| 608 | mp11::mp_if< | ||
| 609 | mp11::mp_valid< | ||
| 610 | has_full_context_conversion_to_impl, typename Sup::type, T>, | ||
| 611 | T> | ||
| 612 | value_to_impl( | ||
| 613 | full_context_conversion_tag, | ||
| 614 | value_to_tag<T> tag, | ||
| 615 | value const& jv, | ||
| 616 | Ctx const& ctx ) | ||
| 617 | { | ||
| 618 | return tag_invoke( tag, jv, Sup::get(ctx), ctx ); | ||
| 619 | } | ||
| 620 | |||
| 621 | //---------------------------------------------------------- | ||
| 622 | // User-provided conversions; throwing -> nonthrowing | ||
| 623 | template< class T, class Ctx > | ||
| 624 | mp11::mp_if_c< !mp11::mp_valid<has_user_conversion_to_impl, T>::value, T> | ||
| 625 | 119 | value_to_impl( | |
| 626 | user_conversion_tag, value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 627 | { | ||
| 628 |
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119 | auto res = tag_invoke(try_value_to_tag<T>(), jv); |
| 629 |
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119 | if( res.has_error() ) |
| 630 | 24 | throw_system_error( res.error() ); | |
| 631 | 190 | return std::move(*res); | |
| 632 | 64 | } | |
| 633 | |||
| 634 | template< | ||
| 635 | class T, | ||
| 636 | class Ctx, | ||
| 637 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 638 | > | ||
| 639 | mp11::mp_if_c< | ||
| 640 | !mp11::mp_valid< | ||
| 641 | has_context_conversion_to_impl, typename Sup::type, T>::value, | ||
| 642 | T> | ||
| 643 | 3 | value_to_impl( | |
| 644 | context_conversion_tag, value_to_tag<T>, value const& jv, Ctx const& ctx ) | ||
| 645 | { | ||
| 646 | 3 | auto res = tag_invoke( try_value_to_tag<T>(), jv, Sup::get(ctx) ); | |
| 647 |
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3 | if( res.has_error() ) |
| 648 | 1 | throw_system_error( res.error() ); | |
| 649 | 4 | return std::move(*res); | |
| 650 | } | ||
| 651 | |||
| 652 | template< | ||
| 653 | class T, | ||
| 654 | class Ctx, | ||
| 655 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 656 | > | ||
| 657 | mp11::mp_if_c< | ||
| 658 | !mp11::mp_valid< | ||
| 659 | has_full_context_conversion_to_impl, typename Sup::type, T>::value, | ||
| 660 | T> | ||
| 661 | value_to_impl( | ||
| 662 | full_context_conversion_tag, | ||
| 663 | value_to_tag<T>, | ||
| 664 | value const& jv, | ||
| 665 | Ctx const& ctx ) | ||
| 666 | { | ||
| 667 | auto res = tag_invoke(try_value_to_tag<T>(), jv, Sup::get(ctx), ctx); | ||
| 668 | if( res.has_error() ) | ||
| 669 | throw_system_error( res.error() ); | ||
| 670 | return std::move(*res); | ||
| 671 | } | ||
| 672 | |||
| 673 | //---------------------------------------------------------- | ||
| 674 | // User-provided conversions; nonthrowing -> nonthrowing | ||
| 675 | template< class T, class Ctx > | ||
| 676 | mp11::mp_if< | ||
| 677 | mp11::mp_valid< | ||
| 678 | has_nonthrowing_user_conversion_to_impl, T>, system::result<T> > | ||
| 679 | 238 | value_to_impl( | |
| 680 | user_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 681 | { | ||
| 682 |
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246 | return tag_invoke(try_value_to_tag<T>(), jv); |
| 683 | } | ||
| 684 | |||
| 685 | template< | ||
| 686 | class T, | ||
| 687 | class Ctx, | ||
| 688 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 689 | > | ||
| 690 | mp11::mp_if< | ||
| 691 | mp11::mp_valid< | ||
| 692 | has_nonthrowing_context_conversion_to_impl, typename Sup::type, T>, | ||
| 693 | system::result<T> > | ||
| 694 | value_to_impl( | ||
| 695 | context_conversion_tag, | ||
| 696 | try_value_to_tag<T> tag, | ||
| 697 | value const& jv, | ||
| 698 | Ctx const& ctx ) | ||
| 699 | { | ||
| 700 | return tag_invoke( tag, jv, Sup::get(ctx) ); | ||
| 701 | } | ||
| 702 | |||
| 703 | template< | ||
| 704 | class T, | ||
| 705 | class Ctx, | ||
| 706 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 707 | > | ||
| 708 | mp11::mp_if< | ||
| 709 | mp11::mp_valid< | ||
| 710 | has_nonthrowing_full_context_conversion_to_impl, | ||
| 711 | typename Sup::type, | ||
| 712 | T>, | ||
| 713 | system::result<T> > | ||
| 714 | value_to_impl( | ||
| 715 | full_context_conversion_tag, | ||
| 716 | try_value_to_tag<T> tag, | ||
| 717 | value const& jv, | ||
| 718 | Ctx const& ctx ) | ||
| 719 | { | ||
| 720 | return tag_invoke( tag, jv, Sup::get(ctx), ctx ); | ||
| 721 | } | ||
| 722 | |||
| 723 | //---------------------------------------------------------- | ||
| 724 | // User-provided conversions; nonthrowing -> throwing | ||
| 725 | |||
| 726 | template< class T, class... Args > | ||
| 727 | system::result<T> | ||
| 728 | 72 | wrap_conversion_exceptions( value_to_tag<T>, Args&& ... args ) | |
| 729 | { | ||
| 730 | #ifndef BOOST_NO_EXCEPTIONS | ||
| 731 | try | ||
| 732 | { | ||
| 733 | #endif | ||
| 734 | return { | ||
| 735 | boost::system::in_place_value, | ||
| 736 |
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72 | tag_invoke( value_to_tag<T>(), static_cast<Args&&>(args)... )}; |
| 737 | #ifndef BOOST_NO_EXCEPTIONS | ||
| 738 | } | ||
| 739 |
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|
60 | catch( std::bad_alloc const&) |
| 740 | { | ||
| 741 | 12 | throw; | |
| 742 | } | ||
| 743 | 24 | catch( system::system_error const& e) | |
| 744 | { | ||
| 745 | 24 | return {boost::system::in_place_error, e.code()}; | |
| 746 | } | ||
| 747 | 24 | catch( ... ) | |
| 748 | { | ||
| 749 | 12 | system::error_code ec; | |
| 750 | 12 | BOOST_JSON_FAIL(ec, error::exception); | |
| 751 | 12 | return {boost::system::in_place_error, ec}; | |
| 752 | } | ||
| 753 | #endif | ||
| 754 | } | ||
| 755 | |||
| 756 | template< class T, class Ctx > | ||
| 757 | mp11::mp_if_c< | ||
| 758 | !mp11::mp_valid<has_nonthrowing_user_conversion_to_impl, T>::value, | ||
| 759 | system::result<T> > | ||
| 760 | 72 | value_to_impl( | |
| 761 | user_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 762 | { | ||
| 763 | 72 | return wrap_conversion_exceptions(value_to_tag<T>(), jv); | |
| 764 | } | ||
| 765 | |||
| 766 | template< | ||
| 767 | class T, | ||
| 768 | class Ctx, | ||
| 769 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 770 | > | ||
| 771 | mp11::mp_if_c< | ||
| 772 | !mp11::mp_valid< | ||
| 773 | has_nonthrowing_context_conversion_to_impl, | ||
| 774 | typename Sup::type, | ||
| 775 | T>::value, | ||
| 776 | system::result<T> > | ||
| 777 | value_to_impl( | ||
| 778 | context_conversion_tag, | ||
| 779 | try_value_to_tag<T>, | ||
| 780 | value const& jv, | ||
| 781 | Ctx const& ctx ) | ||
| 782 | { | ||
| 783 | return wrap_conversion_exceptions( value_to_tag<T>(), jv, Sup::get(ctx) ); | ||
| 784 | } | ||
| 785 | |||
| 786 | template< | ||
| 787 | class T, | ||
| 788 | class Ctx, | ||
| 789 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 790 | > | ||
| 791 | mp11::mp_if_c< | ||
| 792 | !mp11::mp_valid< | ||
| 793 | has_nonthrowing_full_context_conversion_to_impl, | ||
| 794 | typename Sup::type, | ||
| 795 | T>::value, | ||
| 796 | system::result<T> > | ||
| 797 | value_to_impl( | ||
| 798 | full_context_conversion_tag, | ||
| 799 | try_value_to_tag<T>, | ||
| 800 | value const& jv, | ||
| 801 | Ctx const& ctx ) | ||
| 802 | { | ||
| 803 | return wrap_conversion_exceptions( | ||
| 804 | value_to_tag<T>(), jv, Sup::get(ctx), ctx); | ||
| 805 | } | ||
| 806 | |||
| 807 | // no suitable conversion implementation | ||
| 808 | template< class T, class Ctx > | ||
| 809 | T | ||
| 810 | value_to_impl( no_conversion_tag, value_to_tag<T>, value const&, Ctx const& ) | ||
| 811 | { | ||
| 812 | static_assert( | ||
| 813 | !std::is_same<T, T>::value, | ||
| 814 | "No suitable tag_invoke overload found for the type"); | ||
| 815 | } | ||
| 816 | |||
| 817 | // generic wrapper over non-throwing implementations | ||
| 818 | template< class Impl, class T, class Ctx > | ||
| 819 | T | ||
| 820 | 339 | value_to_impl( Impl impl, value_to_tag<T>, value const& jv, Ctx const& ctx ) | |
| 821 | { | ||
| 822 | 339 | return value_to_impl(impl, try_value_to_tag<T>(), jv, ctx).value(); | |
| 823 | } | ||
| 824 | |||
| 825 | template< class Ctx, class T > | ||
| 826 | using value_to_category = conversion_category< | ||
| 827 | Ctx, T, value_to_conversion >; | ||
| 828 | |||
| 829 | } // detail | ||
| 830 | |||
| 831 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 832 | inline | ||
| 833 | system::result<std::nullopt_t> | ||
| 834 | tag_invoke( | ||
| 835 | try_value_to_tag<std::nullopt_t>, | ||
| 836 | value const& jv) | ||
| 837 | { | ||
| 838 | if( jv.is_null() ) | ||
| 839 | return std::nullopt; | ||
| 840 | system::error_code ec; | ||
| 841 | BOOST_JSON_FAIL(ec, error::not_null); | ||
| 842 | return ec; | ||
| 843 | } | ||
| 844 | #endif | ||
| 845 | |||
| 846 | } // namespace json | ||
| 847 | } // namespace boost | ||
| 848 | |||
| 849 | #endif | ||
| 850 |