| Line | Branch | Exec | Source |
|---|---|---|---|
| 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/json/value.hpp> | ||
| 16 | #include <boost/json/conversion.hpp> | ||
| 17 | #include <boost/json/result_for.hpp> | ||
| 18 | #include <boost/describe/enum_from_string.hpp> | ||
| 19 | |||
| 20 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 21 | # include <optional> | ||
| 22 | #endif | ||
| 23 | |||
| 24 | namespace boost { | ||
| 25 | namespace json { | ||
| 26 | |||
| 27 | namespace detail { | ||
| 28 | |||
| 29 | template<class T> | ||
| 30 | using has_reserve_member_helper = decltype(std::declval<T&>().reserve(0)); | ||
| 31 | template<class T> | ||
| 32 | using has_reserve_member = mp11::mp_valid<has_reserve_member_helper, T>; | ||
| 33 | template<class T> | ||
| 34 | using reserve_implementation = mp11::mp_cond< | ||
| 35 | is_tuple_like<T>, mp11::mp_int<2>, | ||
| 36 | has_reserve_member<T>, mp11::mp_int<1>, | ||
| 37 | mp11::mp_true, mp11::mp_int<0>>; | ||
| 38 | |||
| 39 | template<class T> | ||
| 40 | error | ||
| 41 | 78 | try_reserve( | |
| 42 | T&, | ||
| 43 | std::size_t size, | ||
| 44 | mp11::mp_int<2>) | ||
| 45 | { | ||
| 46 | 78 | constexpr std::size_t N = std::tuple_size<remove_cvref<T>>::value; | |
| 47 |
2/2✓ Branch 0 taken 30 times.
✓ Branch 1 taken 11 times.
|
78 | if ( N != size ) |
| 48 | 60 | return error::size_mismatch; | |
| 49 | 18 | return error(); | |
| 50 | } | ||
| 51 | |||
| 52 | template<typename T> | ||
| 53 | error | ||
| 54 | 147 | try_reserve( | |
| 55 | T& cont, | ||
| 56 | std::size_t size, | ||
| 57 | mp11::mp_int<1>) | ||
| 58 | { | ||
| 59 | 147 | cont.reserve(size); | |
| 60 | 147 | return error(); | |
| 61 | } | ||
| 62 | |||
| 63 | template<typename T> | ||
| 64 | error | ||
| 65 | 114 | try_reserve( | |
| 66 | T&, | ||
| 67 | std::size_t, | ||
| 68 | mp11::mp_int<0>) | ||
| 69 | { | ||
| 70 | 114 | return error(); | |
| 71 | } | ||
| 72 | |||
| 73 | |||
| 74 | // identity conversion | ||
| 75 | template< class Ctx > | ||
| 76 | system::result<value> | ||
| 77 | value_to_impl( | ||
| 78 | value_conversion_tag, | ||
| 79 | try_value_to_tag<value>, | ||
| 80 | value const& jv, | ||
| 81 | Ctx const& ) | ||
| 82 | { | ||
| 83 | return jv; | ||
| 84 | } | ||
| 85 | |||
| 86 | template< class Ctx > | ||
| 87 | value | ||
| 88 | value_to_impl( | ||
| 89 | value_conversion_tag, value_to_tag<value>, value const& jv, Ctx const& ) | ||
| 90 | { | ||
| 91 | return jv; | ||
| 92 | } | ||
| 93 | |||
| 94 | // object | ||
| 95 | template< class Ctx > | ||
| 96 | system::result<object> | ||
| 97 | 24 | value_to_impl( | |
| 98 | object_conversion_tag, | ||
| 99 | try_value_to_tag<object>, | ||
| 100 | value const& jv, | ||
| 101 | Ctx const& ) | ||
| 102 | { | ||
| 103 | 24 | object const* obj = jv.if_object(); | |
| 104 |
2/2✓ Branch 0 taken 6 times.
✓ Branch 1 taken 6 times.
|
24 | if( obj ) |
| 105 |
1/1✓ Branch 1 taken 6 times.
|
12 | return *obj; |
| 106 | 12 | system::error_code ec; | |
| 107 | 12 | BOOST_JSON_FAIL(ec, error::not_object); | |
| 108 | 12 | return ec; | |
| 109 | } | ||
| 110 | |||
| 111 | // array | ||
| 112 | template< class Ctx > | ||
| 113 | system::result<array> | ||
| 114 | 24 | value_to_impl( | |
| 115 | array_conversion_tag, | ||
| 116 | try_value_to_tag<array>, | ||
| 117 | value const& jv, | ||
| 118 | Ctx const& ) | ||
| 119 | { | ||
| 120 | 24 | array const* arr = jv.if_array(); | |
| 121 |
2/2✓ Branch 0 taken 6 times.
✓ Branch 1 taken 6 times.
|
24 | if( arr ) |
| 122 |
1/1✓ Branch 1 taken 6 times.
|
12 | return *arr; |
| 123 | 12 | system::error_code ec; | |
| 124 | 12 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 125 | 12 | return ec; | |
| 126 | } | ||
| 127 | |||
| 128 | // string | ||
| 129 | template< class Ctx > | ||
| 130 | system::result<string> | ||
| 131 | 24 | value_to_impl( | |
| 132 | string_conversion_tag, | ||
| 133 | try_value_to_tag<string>, | ||
| 134 | value const& jv, | ||
| 135 | Ctx const& ) | ||
| 136 | { | ||
| 137 | 24 | string const* str = jv.if_string(); | |
| 138 |
2/2✓ Branch 0 taken 6 times.
✓ Branch 1 taken 6 times.
|
24 | if( str ) |
| 139 |
1/1✓ Branch 1 taken 6 times.
|
12 | return *str; |
| 140 | 12 | system::error_code ec; | |
| 141 | 12 | BOOST_JSON_FAIL(ec, error::not_string); | |
| 142 | 12 | return ec; | |
| 143 | } | ||
| 144 | |||
| 145 | // bool | ||
| 146 | template< class Ctx > | ||
| 147 | system::result<bool> | ||
| 148 | 91 | value_to_impl( | |
| 149 | bool_conversion_tag, try_value_to_tag<bool>, value const& jv, Ctx const& ) | ||
| 150 | { | ||
| 151 | 91 | auto b = jv.if_bool(); | |
| 152 |
2/2✓ Branch 0 taken 42 times.
✓ Branch 1 taken 7 times.
|
91 | if( b ) |
| 153 | 78 | return *b; | |
| 154 | 13 | system::error_code ec; | |
| 155 | 13 | BOOST_JSON_FAIL(ec, error::not_bool); | |
| 156 | 13 | return {boost::system::in_place_error, ec}; | |
| 157 | } | ||
| 158 | |||
| 159 | // integral and floating point | ||
| 160 | template< class T, class Ctx > | ||
| 161 | system::result<T> | ||
| 162 | 6788 | value_to_impl( | |
| 163 | number_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 164 | { | ||
| 165 | 6788 | system::error_code ec; | |
| 166 | 6788 | auto const n = jv.to_number<T>(ec); | |
| 167 |
2/2✓ Branch 1 taken 55 times.
✓ Branch 2 taken 3341 times.
|
6788 | if( ec.failed() ) |
| 168 | 110 | return {boost::system::in_place_error, ec}; | |
| 169 | 6678 | return {boost::system::in_place_value, n}; | |
| 170 | } | ||
| 171 | |||
| 172 | // null-like conversion | ||
| 173 | template< class T, class Ctx > | ||
| 174 | system::result<T> | ||
| 175 | 112 | value_to_impl(null_category, try_value_to_tag<T>, value const& jv, Ctx const&) | |
| 176 | { | ||
| 177 |
2/2✓ Branch 1 taken 35 times.
✓ Branch 2 taken 21 times.
|
112 | if( jv.is_null() ) |
| 178 | 70 | return {boost::system::in_place_value, T{}}; | |
| 179 | 42 | system::error_code ec; | |
| 180 | 42 | BOOST_JSON_FAIL(ec, error::not_null); | |
| 181 | 42 | return {boost::system::in_place_error, ec}; | |
| 182 | } | ||
| 183 | |||
| 184 | // string-like types | ||
| 185 | template< class T, class Ctx > | ||
| 186 | system::result<T> | ||
| 187 | 145 | value_to_impl( | |
| 188 | string_category, try_value_to_tag<T>, value const& jv, Ctx const&) | ||
| 189 | { | ||
| 190 | 145 | auto str = jv.if_string(); | |
| 191 |
2/2✓ Branch 0 taken 67 times.
✓ Branch 1 taken 12 times.
|
145 | if( str ) |
| 192 |
1/1✓ Branch 2 taken 67 times.
|
121 | return {boost::system::in_place_value, T(str->subview())}; |
| 193 | 24 | system::error_code ec; | |
| 194 | 24 | BOOST_JSON_FAIL(ec, error::not_string); | |
| 195 | 24 | return {boost::system::in_place_error, ec}; | |
| 196 | } | ||
| 197 | |||
| 198 | // map-like containers | ||
| 199 | template< class T, class Ctx > | ||
| 200 | system::result<T> | ||
| 201 | 148 | value_to_impl( | |
| 202 | map_category, try_value_to_tag<T>, value const& jv, Ctx const& ctx) | ||
| 203 | { | ||
| 204 | 148 | object const* obj = jv.if_object(); | |
| 205 |
2/2✓ Branch 0 taken 12 times.
✓ Branch 1 taken 62 times.
|
148 | if( !obj ) |
| 206 | { | ||
| 207 | 24 | system::error_code ec; | |
| 208 | 24 | BOOST_JSON_FAIL(ec, error::not_object); | |
| 209 | 24 | return {boost::system::in_place_error, ec}; | |
| 210 | } | ||
| 211 | |||
| 212 |
1/1✓ Branch 1 taken 12 times.
|
124 | T res; |
| 213 |
1/1✓ Branch 2 taken 6 times.
|
124 | error const e = detail::try_reserve( |
| 214 | res, obj->size(), reserve_implementation<T>()); | ||
| 215 |
2/2✓ Branch 0 taken 12 times.
✓ Branch 1 taken 50 times.
|
124 | if( e != error() ) |
| 216 | { | ||
| 217 | 24 | system::error_code ec; | |
| 218 | 24 | BOOST_JSON_FAIL( ec, e ); | |
| 219 | 24 | return {boost::system::in_place_error, ec}; | |
| 220 | } | ||
| 221 | |||
| 222 |
1/1✓ Branch 1 taken 50 times.
|
100 | auto ins = detail::inserter(res, inserter_implementation<T>()); |
| 223 |
4/5✓ Branch 2 taken 98 times.
✓ Branch 3 taken 36 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 6 times.
✓ Branch 6 taken 7 times.
|
294 | for( key_value_pair const& kv: *obj ) |
| 224 | { | ||
| 225 |
1/1✓ Branch 2 taken 43 times.
|
208 | auto elem_res = try_value_to<mapped_type<T>>( kv.value(), ctx ); |
| 226 |
2/2✓ Branch 1 taken 13 times.
✓ Branch 2 taken 91 times.
|
208 | if( elem_res.has_error() ) |
| 227 | 26 | return {boost::system::in_place_error, elem_res.error()}; | |
| 228 |
2/2✓ Branch 1 taken 91 times.
✓ Branch 6 taken 91 times.
|
182 | *ins++ = value_type<T>{ |
| 229 |
1/1✓ Branch 2 taken 91 times.
|
364 | key_type<T>(kv.key()), |
| 230 | 182 | std::move(*elem_res)}; | |
| 231 | } | ||
| 232 | 74 | return res; | |
| 233 | 124 | } | |
| 234 | |||
| 235 | // all other containers | ||
| 236 | template< class T, class Ctx > | ||
| 237 | system::result<T> | ||
| 238 | 237 | value_to_impl( | |
| 239 | sequence_category, try_value_to_tag<T>, value const& jv, Ctx const& ctx) | ||
| 240 | { | ||
| 241 | 237 | array const* arr = jv.if_array(); | |
| 242 |
2/2✓ Branch 0 taken 12 times.
✓ Branch 1 taken 107 times.
|
237 | if( !arr ) |
| 243 | { | ||
| 244 | 24 | system::error_code ec; | |
| 245 | 24 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 246 | 24 | return {boost::system::in_place_error, ec}; | |
| 247 | } | ||
| 248 | |||
| 249 | 157 | T result; | |
| 250 |
1/1✓ Branch 2 taken 67 times.
|
213 | error const e = detail::try_reserve( |
| 251 | result, arr->size(), reserve_implementation<T>()); | ||
| 252 |
2/2✓ Branch 0 taken 18 times.
✓ Branch 1 taken 89 times.
|
213 | if( e != error() ) |
| 253 | { | ||
| 254 | 36 | system::error_code ec; | |
| 255 | 36 | BOOST_JSON_FAIL( ec, e ); | |
| 256 | 36 | return {boost::system::in_place_error, ec}; | |
| 257 | } | ||
| 258 | |||
| 259 |
1/1✓ Branch 1 taken 79 times.
|
177 | auto ins = detail::inserter(result, inserter_implementation<T>()); |
| 260 |
4/5✓ Branch 2 taken 3190 times.
✓ Branch 3 taken 100 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 39 times.
✓ Branch 6 taken 15 times.
|
6683 | for( value const& val: *arr ) |
| 261 | { | ||
| 262 |
1/1✓ Branch 1 taken 110 times.
|
6454 | auto elem_res = try_value_to<value_type<T>>( val, ctx ); |
| 263 |
2/2✓ Branch 1 taken 13 times.
✓ Branch 2 taken 3216 times.
|
6454 | if( elem_res.has_error() ) |
| 264 | 26 | return {boost::system::in_place_error, elem_res.error()}; | |
| 265 |
1/1✓ Branch 5 taken 200 times.
|
6428 | *ins++ = std::move(*elem_res); |
| 266 | } | ||
| 267 | 151 | return result; | |
| 268 | 157 | } | |
| 269 | |||
| 270 | // tuple-like types | ||
| 271 | template< class T, class Ctx > | ||
| 272 | system::result<T> | ||
| 273 | 456 | try_make_tuple_elem(value const& jv, Ctx const& ctx, system::error_code& ec) | |
| 274 | { | ||
| 275 |
2/2✓ Branch 1 taken 38 times.
✓ Branch 2 taken 192 times.
|
456 | if( ec.failed() ) |
| 276 | 76 | return {boost::system::in_place_error, ec}; | |
| 277 | |||
| 278 |
1/1✓ Branch 1 taken 73 times.
|
380 | auto result = try_value_to<T>( jv, ctx ); |
| 279 | 380 | ec = result.error(); | |
| 280 | 380 | return result; | |
| 281 | 114 | } | |
| 282 | |||
| 283 | template <class T, class Ctx, std::size_t... Is> | ||
| 284 | system::result<T> | ||
| 285 | 181 | try_make_tuple_like( | |
| 286 | array const& arr, Ctx const& ctx, boost::mp11::index_sequence<Is...>) | ||
| 287 | { | ||
| 288 | 181 | system::error_code ec; | |
| 289 |
3/3✓ Branch 1 taken 37 times.
✓ Branch 9 taken 10 times.
✓ Branch 5 taken 44 times.
|
217 | auto items = std::make_tuple( |
| 290 | try_make_tuple_elem< | ||
| 291 |
4/4✓ Branch 2 taken 13 times.
✓ Branch 6 taken 13 times.
✓ Branch 10 taken 1 times.
✓ Branch 14 taken 1 times.
|
221 | typename std::decay<tuple_element_t<Is, T>>::type >( |
| 292 | arr[Is], ctx, ec) | ||
| 293 | ...); | ||
| 294 | #if defined(BOOST_GCC) | ||
| 295 | # pragma GCC diagnostic push | ||
| 296 | # pragma GCC diagnostic ignored "-Wmaybe-uninitialized" | ||
| 297 | #endif | ||
| 298 |
2/2✓ Branch 1 taken 13 times.
✓ Branch 2 taken 78 times.
|
181 | if( ec.failed() ) |
| 299 | 26 | return {boost::system::in_place_error, ec}; | |
| 300 | #if defined(BOOST_GCC) | ||
| 301 | # pragma GCC diagnostic pop | ||
| 302 | #endif | ||
| 303 | |||
| 304 | return { | ||
| 305 |
1/1✓ Branch 8 taken 18 times.
|
155 | boost::system::in_place_value, T(std::move(*std::get<Is>(items))...)}; |
| 306 | 108 | } | |
| 307 | |||
| 308 | template< class T, class Ctx > | ||
| 309 | system::result<T> | ||
| 310 | 229 | value_to_impl( | |
| 311 | tuple_category, try_value_to_tag<T>, value const& jv, Ctx const& ctx) | ||
| 312 | { | ||
| 313 | 229 | system::error_code ec; | |
| 314 | |||
| 315 | 229 | array const* arr = jv.if_array(); | |
| 316 |
2/2✓ Branch 0 taken 12 times.
✓ Branch 1 taken 103 times.
|
229 | if( !arr ) |
| 317 | { | ||
| 318 | 24 | BOOST_JSON_FAIL(ec, error::not_array); | |
| 319 | 24 | return {boost::system::in_place_error, ec}; | |
| 320 | } | ||
| 321 | |||
| 322 | 205 | constexpr std::size_t N = std::tuple_size<remove_cvref<T>>::value; | |
| 323 |
2/2✓ Branch 1 taken 12 times.
✓ Branch 2 taken 91 times.
|
205 | if( N != arr->size() ) |
| 324 | { | ||
| 325 | 24 | BOOST_JSON_FAIL(ec, error::size_mismatch); | |
| 326 | 24 | return {boost::system::in_place_error, ec}; | |
| 327 | } | ||
| 328 | |||
| 329 |
1/1✓ Branch 1 taken 31 times.
|
61 | return try_make_tuple_like<T>( |
| 330 |
1/1✓ Branch 1 taken 60 times.
|
181 | *arr, ctx, boost::mp11::make_index_sequence<N>()); |
| 331 | } | ||
| 332 | |||
| 333 | template< class Ctx, class T > | ||
| 334 | struct to_described_member | ||
| 335 | { | ||
| 336 | static_assert( | ||
| 337 | uniquely_named_members<T>::value, | ||
| 338 | "The type has several described members with the same name."); | ||
| 339 | |||
| 340 | using Ds = described_members<T>; | ||
| 341 | |||
| 342 | system::result<T>& res; | ||
| 343 | object const& obj; | ||
| 344 | Ctx const& ctx; | ||
| 345 | |||
| 346 | template< class I > | ||
| 347 | void | ||
| 348 | operator()(I) | ||
| 349 | { | ||
| 350 | if( !res ) | ||
| 351 | return; | ||
| 352 | |||
| 353 | using D = mp11::mp_at<Ds, I>; | ||
| 354 | using M = described_member_t<T, D>; | ||
| 355 | |||
| 356 | auto const found = obj.find(D::name); | ||
| 357 | if( found == obj.end() ) | ||
| 358 | { | ||
| 359 | BOOST_IF_CONSTEXPR( !is_optional_like<M>::value ) | ||
| 360 | { | ||
| 361 | system::error_code ec; | ||
| 362 | BOOST_JSON_FAIL(ec, error::size_mismatch); | ||
| 363 | res = {boost::system::in_place_error, ec}; | ||
| 364 | } | ||
| 365 | return; | ||
| 366 | } | ||
| 367 | |||
| 368 | #if defined(__GNUC__) && BOOST_GCC_VERSION >= 80000 && BOOST_GCC_VERSION < 11000 | ||
| 369 | # pragma GCC diagnostic push | ||
| 370 | # pragma GCC diagnostic ignored "-Wunused" | ||
| 371 | # pragma GCC diagnostic ignored "-Wunused-variable" | ||
| 372 | #endif | ||
| 373 | auto member_res = try_value_to<M>( found->value(), ctx ); | ||
| 374 | #if defined(__GNUC__) && BOOST_GCC_VERSION >= 80000 && BOOST_GCC_VERSION < 11000 | ||
| 375 | # pragma GCC diagnostic pop | ||
| 376 | #endif | ||
| 377 | if( member_res ) | ||
| 378 | (*res).* D::pointer = std::move(*member_res); | ||
| 379 | else | ||
| 380 | res = {boost::system::in_place_error, member_res.error()}; | ||
| 381 | } | ||
| 382 | }; | ||
| 383 | |||
| 384 | // described classes | ||
| 385 | template< class T, class Ctx > | ||
| 386 | system::result<T> | ||
| 387 | value_to_impl( | ||
| 388 | described_class_category, | ||
| 389 | try_value_to_tag<T>, | ||
| 390 | value const& jv, | ||
| 391 | Ctx const& ctx ) | ||
| 392 | { | ||
| 393 | BOOST_STATIC_ASSERT( std::is_default_constructible<T>::value ); | ||
| 394 | system::result<T> res; | ||
| 395 | |||
| 396 | auto* obj = jv.if_object(); | ||
| 397 | if( !obj ) | ||
| 398 | { | ||
| 399 | system::error_code ec; | ||
| 400 | BOOST_JSON_FAIL(ec, error::not_object); | ||
| 401 | res = {boost::system::in_place_error, ec}; | ||
| 402 | return res; | ||
| 403 | } | ||
| 404 | |||
| 405 | to_described_member<Ctx, T> member_converter{res, *obj, ctx}; | ||
| 406 | |||
| 407 | using Ds = typename decltype(member_converter)::Ds; | ||
| 408 | constexpr std::size_t N = mp11::mp_size<Ds>::value; | ||
| 409 | mp11::mp_for_each< mp11::mp_iota_c<N> >(member_converter); | ||
| 410 | |||
| 411 | if( !res ) | ||
| 412 | return res; | ||
| 413 | |||
| 414 | return res; | ||
| 415 | } | ||
| 416 | |||
| 417 | // described enums | ||
| 418 | template< class T, class Ctx > | ||
| 419 | system::result<T> | ||
| 420 | value_to_impl( | ||
| 421 | described_enum_category, try_value_to_tag<T>, value const& jv, Ctx const&) | ||
| 422 | { | ||
| 423 | T val = {}; | ||
| 424 | (void)jv; | ||
| 425 | #ifdef BOOST_DESCRIBE_CXX14 | ||
| 426 | system::error_code ec; | ||
| 427 | |||
| 428 | auto str = jv.if_string(); | ||
| 429 | if( !str ) | ||
| 430 | { | ||
| 431 | BOOST_JSON_FAIL(ec, error::not_string); | ||
| 432 | return {system::in_place_error, ec}; | ||
| 433 | } | ||
| 434 | |||
| 435 | if( !describe::enum_from_string(str->data(), val) ) | ||
| 436 | { | ||
| 437 | BOOST_JSON_FAIL(ec, error::unknown_name); | ||
| 438 | return {system::in_place_error, ec}; | ||
| 439 | } | ||
| 440 | #endif | ||
| 441 | |||
| 442 | return {system::in_place_value, val}; | ||
| 443 | } | ||
| 444 | |||
| 445 | // optionals | ||
| 446 | template< class T, class Ctx > | ||
| 447 | system::result<T> | ||
| 448 | value_to_impl( | ||
| 449 | optional_category, try_value_to_tag<T>, value const& jv, Ctx const& ctx) | ||
| 450 | { | ||
| 451 | using Inner = value_result_type<T>; | ||
| 452 | if( jv.is_null() ) | ||
| 453 | return {}; | ||
| 454 | else | ||
| 455 | return try_value_to<Inner>(jv, ctx); | ||
| 456 | } | ||
| 457 | |||
| 458 | // variants | ||
| 459 | template< class T, class V, class I > | ||
| 460 | using variant_construction_category = mp11::mp_cond< | ||
| 461 | std::is_constructible< T, variant2::in_place_index_t<I::value>, V >, | ||
| 462 | mp11::mp_int<2>, | ||
| 463 | #ifndef BOOST_NO_CXX17_HDR_VARIANT | ||
| 464 | std::is_constructible< T, std::in_place_index_t<I::value>, V >, | ||
| 465 | mp11::mp_int<1>, | ||
| 466 | #endif // BOOST_NO_CXX17_HDR_VARIANT | ||
| 467 | mp11::mp_true, | ||
| 468 | mp11::mp_int<0> >; | ||
| 469 | |||
| 470 | template< class T, class I, class V > | ||
| 471 | T | ||
| 472 | initialize_variant( V&& v, mp11::mp_int<0> ) | ||
| 473 | { | ||
| 474 | T t; | ||
| 475 | t.template emplace<I::value>( std::move(v) ); | ||
| 476 | return t; | ||
| 477 | } | ||
| 478 | |||
| 479 | template< class T, class I, class V > | ||
| 480 | T | ||
| 481 | initialize_variant( V&& v, mp11::mp_int<2> ) | ||
| 482 | { | ||
| 483 | return T( variant2::in_place_index_t<I::value>(), std::move(v) ); | ||
| 484 | } | ||
| 485 | |||
| 486 | #ifndef BOOST_NO_CXX17_HDR_VARIANT | ||
| 487 | template< class T, class I, class V > | ||
| 488 | T | ||
| 489 | initialize_variant( V&& v, mp11::mp_int<1> ) | ||
| 490 | { | ||
| 491 | return T( std::in_place_index_t<I::value>(), std::move(v) ); | ||
| 492 | } | ||
| 493 | #endif // BOOST_NO_CXX17_HDR_VARIANT | ||
| 494 | |||
| 495 | |||
| 496 | template< class T, class Ctx > | ||
| 497 | struct alternative_converter | ||
| 498 | { | ||
| 499 | system::result<T>& res; | ||
| 500 | value const& jv; | ||
| 501 | Ctx const& ctx; | ||
| 502 | |||
| 503 | template< class I > | ||
| 504 | void operator()( I ) const | ||
| 505 | { | ||
| 506 | if( res ) | ||
| 507 | return; | ||
| 508 | |||
| 509 | using V = mp11::mp_at<T, I>; | ||
| 510 | auto attempt = try_value_to<V>(jv, ctx); | ||
| 511 | if( attempt ) | ||
| 512 | { | ||
| 513 | using cat = variant_construction_category<T, V, I>; | ||
| 514 | res = initialize_variant<T, I>( std::move(*attempt), cat() ); | ||
| 515 | } | ||
| 516 | } | ||
| 517 | }; | ||
| 518 | |||
| 519 | template< class T, class Ctx > | ||
| 520 | system::result<T> | ||
| 521 | value_to_impl( | ||
| 522 | variant_category, try_value_to_tag<T>, value const& jv, Ctx const& ctx) | ||
| 523 | { | ||
| 524 | system::error_code ec; | ||
| 525 | BOOST_JSON_FAIL(ec, error::exhausted_variants); | ||
| 526 | |||
| 527 | using Is = mp11::mp_iota< mp11::mp_size<T> >; | ||
| 528 | |||
| 529 | system::result<T> res = {system::in_place_error, ec}; | ||
| 530 | mp11::mp_for_each<Is>( alternative_converter<T, Ctx>{res, jv, ctx} ); | ||
| 531 | return res; | ||
| 532 | } | ||
| 533 | |||
| 534 | template< class T, class Ctx > | ||
| 535 | system::result<T> | ||
| 536 | value_to_impl(path_category, try_value_to_tag<T>, value const& jv, Ctx const&) | ||
| 537 | { | ||
| 538 | auto str = jv.if_string(); | ||
| 539 | if( !str ) | ||
| 540 | { | ||
| 541 | system::error_code ec; | ||
| 542 | BOOST_JSON_FAIL(ec, error::not_string); | ||
| 543 | return {boost::system::in_place_error, ec}; | ||
| 544 | } | ||
| 545 | |||
| 546 | string_view sv = str->subview(); | ||
| 547 | return {boost::system::in_place_value, T( sv.begin(), sv.end() )}; | ||
| 548 | } | ||
| 549 | |||
| 550 | //---------------------------------------------------------- | ||
| 551 | // User-provided conversions; throwing -> throwing | ||
| 552 | template< class T, class Ctx > | ||
| 553 | mp11::mp_if< mp11::mp_valid<has_user_conversion_to_impl, T>, T > | ||
| 554 | 1 | value_to_impl( | |
| 555 | user_conversion_tag, value_to_tag<T> tag, value const& jv, Ctx const&) | ||
| 556 | { | ||
| 557 | 1 | return tag_invoke(tag, jv); | |
| 558 | } | ||
| 559 | |||
| 560 | template< | ||
| 561 | class T, | ||
| 562 | class Ctx, | ||
| 563 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 564 | > | ||
| 565 | mp11::mp_if< | ||
| 566 | mp11::mp_valid< has_context_conversion_to_impl, typename Sup::type, T>, T > | ||
| 567 | 1 | value_to_impl( | |
| 568 | context_conversion_tag, | ||
| 569 | value_to_tag<T> tag, | ||
| 570 | value const& jv, | ||
| 571 | Ctx const& ctx ) | ||
| 572 | { | ||
| 573 | 1 | return tag_invoke( tag, jv, Sup::get(ctx) ); | |
| 574 | } | ||
| 575 | |||
| 576 | template< | ||
| 577 | class T, | ||
| 578 | class Ctx, | ||
| 579 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 580 | > | ||
| 581 | mp11::mp_if< | ||
| 582 | mp11::mp_valid< | ||
| 583 | has_full_context_conversion_to_impl, typename Sup::type, T>, | ||
| 584 | T> | ||
| 585 | value_to_impl( | ||
| 586 | full_context_conversion_tag, | ||
| 587 | value_to_tag<T> tag, | ||
| 588 | value const& jv, | ||
| 589 | Ctx const& ctx ) | ||
| 590 | { | ||
| 591 | return tag_invoke( tag, jv, Sup::get(ctx), ctx ); | ||
| 592 | } | ||
| 593 | |||
| 594 | //---------------------------------------------------------- | ||
| 595 | // User-provided conversions; throwing -> nonthrowing | ||
| 596 | template< class T, class Ctx > | ||
| 597 | mp11::mp_if_c< !mp11::mp_valid<has_user_conversion_to_impl, T>::value, T> | ||
| 598 | 119 | value_to_impl( | |
| 599 | user_conversion_tag, value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 600 | { | ||
| 601 |
1/1✓ Branch 1 taken 48 times.
|
119 | auto res = tag_invoke(try_value_to_tag<T>(), jv); |
| 602 |
2/2✓ Branch 1 taken 12 times.
✓ Branch 2 taken 48 times.
|
119 | if( res.has_error() ) |
| 603 | 24 | throw_system_error( res.error() ); | |
| 604 | 190 | return std::move(*res); | |
| 605 | 64 | } | |
| 606 | |||
| 607 | template< | ||
| 608 | class T, | ||
| 609 | class Ctx, | ||
| 610 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 611 | > | ||
| 612 | mp11::mp_if_c< | ||
| 613 | !mp11::mp_valid< | ||
| 614 | has_context_conversion_to_impl, typename Sup::type, T>::value, | ||
| 615 | T> | ||
| 616 | 3 | value_to_impl( | |
| 617 | context_conversion_tag, value_to_tag<T>, value const& jv, Ctx const& ctx ) | ||
| 618 | { | ||
| 619 | 3 | auto res = tag_invoke( try_value_to_tag<T>(), jv, Sup::get(ctx) ); | |
| 620 |
2/2✓ Branch 1 taken 1 times.
✓ Branch 2 taken 2 times.
|
3 | if( res.has_error() ) |
| 621 | 1 | throw_system_error( res.error() ); | |
| 622 | 4 | return std::move(*res); | |
| 623 | } | ||
| 624 | |||
| 625 | template< | ||
| 626 | class T, | ||
| 627 | class Ctx, | ||
| 628 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 629 | > | ||
| 630 | mp11::mp_if_c< | ||
| 631 | !mp11::mp_valid< | ||
| 632 | has_full_context_conversion_to_impl, typename Sup::type, T>::value, | ||
| 633 | T> | ||
| 634 | value_to_impl( | ||
| 635 | full_context_conversion_tag, | ||
| 636 | value_to_tag<T>, | ||
| 637 | value const& jv, | ||
| 638 | Ctx const& ctx ) | ||
| 639 | { | ||
| 640 | auto res = tag_invoke(try_value_to_tag<T>(), jv, Sup::get(ctx), ctx); | ||
| 641 | if( res.has_error() ) | ||
| 642 | throw_system_error( res.error() ); | ||
| 643 | return std::move(*res); | ||
| 644 | } | ||
| 645 | |||
| 646 | //---------------------------------------------------------- | ||
| 647 | // User-provided conversions; nonthrowing -> nonthrowing | ||
| 648 | template< class T, class Ctx > | ||
| 649 | mp11::mp_if< | ||
| 650 | mp11::mp_valid< | ||
| 651 | has_nonthrowing_user_conversion_to_impl, T>, system::result<T> > | ||
| 652 | 238 | value_to_impl( | |
| 653 | user_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 654 | { | ||
| 655 |
1/1✓ Branch 1 taken 10 times.
|
246 | return tag_invoke(try_value_to_tag<T>(), jv); |
| 656 | } | ||
| 657 | |||
| 658 | template< | ||
| 659 | class T, | ||
| 660 | class Ctx, | ||
| 661 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 662 | > | ||
| 663 | mp11::mp_if< | ||
| 664 | mp11::mp_valid< | ||
| 665 | has_nonthrowing_context_conversion_to_impl, typename Sup::type, T>, | ||
| 666 | system::result<T> > | ||
| 667 | value_to_impl( | ||
| 668 | context_conversion_tag, | ||
| 669 | try_value_to_tag<T> tag, | ||
| 670 | value const& jv, | ||
| 671 | Ctx const& ctx ) | ||
| 672 | { | ||
| 673 | return tag_invoke( tag, jv, Sup::get(ctx) ); | ||
| 674 | } | ||
| 675 | |||
| 676 | template< | ||
| 677 | class T, | ||
| 678 | class Ctx, | ||
| 679 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 680 | > | ||
| 681 | mp11::mp_if< | ||
| 682 | mp11::mp_valid< | ||
| 683 | has_nonthrowing_full_context_conversion_to_impl, | ||
| 684 | typename Sup::type, | ||
| 685 | T>, | ||
| 686 | system::result<T> > | ||
| 687 | value_to_impl( | ||
| 688 | full_context_conversion_tag, | ||
| 689 | try_value_to_tag<T> tag, | ||
| 690 | value const& jv, | ||
| 691 | Ctx const& ctx ) | ||
| 692 | { | ||
| 693 | return tag_invoke( tag, jv, Sup::get(ctx), ctx ); | ||
| 694 | } | ||
| 695 | |||
| 696 | //---------------------------------------------------------- | ||
| 697 | // User-provided conversions; nonthrowing -> throwing | ||
| 698 | |||
| 699 | template< class T, class... Args > | ||
| 700 | system::result<T> | ||
| 701 | 72 | wrap_conversion_exceptions( value_to_tag<T>, Args&& ... args ) | |
| 702 | { | ||
| 703 | #ifndef BOOST_NO_EXCEPTIONS | ||
| 704 | try | ||
| 705 | { | ||
| 706 | #endif | ||
| 707 | return { | ||
| 708 | boost::system::in_place_value, | ||
| 709 |
1/1✓ Branch 1 taken 12 times.
|
72 | tag_invoke( value_to_tag<T>(), static_cast<Args&&>(args)... )}; |
| 710 | #ifndef BOOST_NO_EXCEPTIONS | ||
| 711 | } | ||
| 712 |
3/3✓ Branch 0 taken 6 times.
✓ Branch 1 taken 12 times.
✓ Branch 2 taken 6 times.
|
60 | catch( std::bad_alloc const&) |
| 713 | { | ||
| 714 | 12 | throw; | |
| 715 | } | ||
| 716 | 24 | catch( system::system_error const& e) | |
| 717 | { | ||
| 718 | 24 | return {boost::system::in_place_error, e.code()}; | |
| 719 | } | ||
| 720 | 24 | catch( ... ) | |
| 721 | { | ||
| 722 | 12 | system::error_code ec; | |
| 723 | 12 | BOOST_JSON_FAIL(ec, error::exception); | |
| 724 | 12 | return {boost::system::in_place_error, ec}; | |
| 725 | } | ||
| 726 | #endif | ||
| 727 | } | ||
| 728 | |||
| 729 | template< class T, class Ctx > | ||
| 730 | mp11::mp_if_c< | ||
| 731 | !mp11::mp_valid<has_nonthrowing_user_conversion_to_impl, T>::value, | ||
| 732 | system::result<T> > | ||
| 733 | 72 | value_to_impl( | |
| 734 | user_conversion_tag, try_value_to_tag<T>, value const& jv, Ctx const& ) | ||
| 735 | { | ||
| 736 | 72 | return wrap_conversion_exceptions(value_to_tag<T>(), jv); | |
| 737 | } | ||
| 738 | |||
| 739 | template< | ||
| 740 | class T, | ||
| 741 | class Ctx, | ||
| 742 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 743 | > | ||
| 744 | mp11::mp_if_c< | ||
| 745 | !mp11::mp_valid< | ||
| 746 | has_nonthrowing_context_conversion_to_impl, | ||
| 747 | typename Sup::type, | ||
| 748 | T>::value, | ||
| 749 | system::result<T> > | ||
| 750 | value_to_impl( | ||
| 751 | context_conversion_tag, | ||
| 752 | try_value_to_tag<T>, | ||
| 753 | value const& jv, | ||
| 754 | Ctx const& ctx ) | ||
| 755 | { | ||
| 756 | return wrap_conversion_exceptions( value_to_tag<T>(), jv, Sup::get(ctx) ); | ||
| 757 | } | ||
| 758 | |||
| 759 | template< | ||
| 760 | class T, | ||
| 761 | class Ctx, | ||
| 762 | class Sup = supported_context<Ctx, T, value_to_conversion> | ||
| 763 | > | ||
| 764 | mp11::mp_if_c< | ||
| 765 | !mp11::mp_valid< | ||
| 766 | has_nonthrowing_full_context_conversion_to_impl, | ||
| 767 | typename Sup::type, | ||
| 768 | T>::value, | ||
| 769 | system::result<T> > | ||
| 770 | value_to_impl( | ||
| 771 | full_context_conversion_tag, | ||
| 772 | try_value_to_tag<T>, | ||
| 773 | value const& jv, | ||
| 774 | Ctx const& ctx ) | ||
| 775 | { | ||
| 776 | return wrap_conversion_exceptions( | ||
| 777 | value_to_tag<T>(), jv, Sup::get(ctx), ctx); | ||
| 778 | } | ||
| 779 | |||
| 780 | // no suitable conversion implementation | ||
| 781 | template< class T, class Ctx > | ||
| 782 | T | ||
| 783 | value_to_impl(unknown_category, value_to_tag<T>, value const&, Ctx const&) | ||
| 784 | { | ||
| 785 | static_assert( | ||
| 786 | !std::is_same<T, T>::value, | ||
| 787 | "No suitable tag_invoke overload found for the type"); | ||
| 788 | } | ||
| 789 | |||
| 790 | // generic wrapper over non-throwing implementations | ||
| 791 | template< class Impl, class T, class Ctx > | ||
| 792 | T | ||
| 793 | 339 | value_to_impl( Impl impl, value_to_tag<T>, value const& jv, Ctx const& ctx ) | |
| 794 | { | ||
| 795 | 339 | return value_to_impl(impl, try_value_to_tag<T>(), jv, ctx).value(); | |
| 796 | } | ||
| 797 | |||
| 798 | template< class Ctx, class T > | ||
| 799 | using value_to_category = conversion_category< | ||
| 800 | Ctx, T, value_to_conversion >; | ||
| 801 | |||
| 802 | } // detail | ||
| 803 | |||
| 804 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 805 | inline | ||
| 806 | system::result<std::nullopt_t> | ||
| 807 | tag_invoke( | ||
| 808 | try_value_to_tag<std::nullopt_t>, | ||
| 809 | value const& jv) | ||
| 810 | { | ||
| 811 | if( jv.is_null() ) | ||
| 812 | return std::nullopt; | ||
| 813 | system::error_code ec; | ||
| 814 | BOOST_JSON_FAIL(ec, error::not_null); | ||
| 815 | return ec; | ||
| 816 | } | ||
| 817 | #endif | ||
| 818 | |||
| 819 | } // namespace json | ||
| 820 | } // namespace boost | ||
| 821 | |||
| 822 | #endif | ||
| 823 |