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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) 2022 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_FROM_HPP | ||
| 13 | #define BOOST_JSON_DETAIL_VALUE_FROM_HPP | ||
| 14 | |||
| 15 | #include <boost/json/conversion.hpp> | ||
| 16 | #include <boost/describe/enum_to_string.hpp> | ||
| 17 | #include <boost/mp11/algorithm.hpp> | ||
| 18 | |||
| 19 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 20 | # include <optional> | ||
| 21 | #endif | ||
| 22 | |||
| 23 | namespace boost { | ||
| 24 | namespace json { | ||
| 25 | |||
| 26 | namespace detail { | ||
| 27 | |||
| 28 | template< class Ctx, class T > | ||
| 29 | struct append_tuple_element { | ||
| 30 | array& arr; | ||
| 31 | Ctx const& ctx; | ||
| 32 | T&& t; | ||
| 33 | |||
| 34 | template<std::size_t I> | ||
| 35 | void | ||
| 36 | 590 | operator()(mp11::mp_size_t<I>) const | |
| 37 | { | ||
| 38 | using std::get; | ||
| 39 |
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1180 | arr.emplace_back(value_from( |
| 40 |
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1200 | get<I>(std::forward<T>(t)), ctx, arr.storage() )); |
| 41 | 590 | } | |
| 42 | }; | ||
| 43 | |||
| 44 | //---------------------------------------------------------- | ||
| 45 | // User-provided conversion | ||
| 46 | |||
| 47 | template< class T, class Ctx > | ||
| 48 | void | ||
| 49 | 65 | value_from_impl( user_conversion_tag, value& jv, T&& from, Ctx const& ) | |
| 50 | { | ||
| 51 |
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65 | tag_invoke( value_from_tag(), jv, static_cast<T&&>(from) ); |
| 52 | 65 | } | |
| 53 | |||
| 54 | template< class T, class Ctx > | ||
| 55 | void | ||
| 56 | 51 | value_from_impl( context_conversion_tag, value& jv, T&& from, Ctx const& ctx) | |
| 57 | { | ||
| 58 | using Sup = supported_context<Ctx, T, value_from_conversion>; | ||
| 59 |
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51 | tag_invoke( value_from_tag(), jv, static_cast<T&&>(from), Sup::get(ctx) ); |
| 60 | 51 | } | |
| 61 | |||
| 62 | template< class T, class Ctx > | ||
| 63 | void | ||
| 64 | 2 | value_from_impl( | |
| 65 | full_context_conversion_tag, value& jv, T&& from, Ctx const& ctx) | ||
| 66 | { | ||
| 67 | using Sup = supported_context<Ctx, T, value_from_conversion>; | ||
| 68 | 2 | tag_invoke( | |
| 69 | 2 | value_from_tag(), jv, static_cast<T&&>(from), Sup::get(ctx), ctx ); | |
| 70 | 2 | } | |
| 71 | |||
| 72 | //---------------------------------------------------------- | ||
| 73 | // Native conversion | ||
| 74 | |||
| 75 | template< class T, class Ctx > | ||
| 76 | void | ||
| 77 | 13078 | value_from_impl( native_conversion_tag, value& jv, T&& from, Ctx const& ) | |
| 78 | { | ||
| 79 | 13078 | jv = std::forward<T>(from); | |
| 80 | 13078 | } | |
| 81 | |||
| 82 | // null-like types | ||
| 83 | template< class T, class Ctx > | ||
| 84 | void | ||
| 85 | 22 | value_from_impl(null_category, value& jv, T&&, Ctx const&) | |
| 86 | { | ||
| 87 | // do nothing | ||
| 88 |
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22 | BOOST_ASSERT(jv.is_null()); |
| 89 | (void)jv; | ||
| 90 | 22 | } | |
| 91 | |||
| 92 | // string-like types | ||
| 93 | template< class T, class Ctx > | ||
| 94 | void | ||
| 95 | 137 | value_from_impl(string_category, value& jv, T&& from, Ctx const&) | |
| 96 | { | ||
| 97 | 137 | auto sv = static_cast<string_view>(from); | |
| 98 |
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137 | jv.emplace_string().assign(sv); |
| 99 | 137 | } | |
| 100 | |||
| 101 | // map-like types | ||
| 102 | template< class T, class Ctx > | ||
| 103 | void | ||
| 104 | 92 | value_from_impl(map_category, value& jv, T&& from, Ctx const& ctx) | |
| 105 | { | ||
| 106 | using std::get; | ||
| 107 | 92 | object& obj = jv.emplace_object(); | |
| 108 | 92 | obj.reserve(detail::try_size(from, size_implementation<T>())); | |
| 109 |
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290 | for (auto&& elem : from) |
| 110 |
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594 | obj.emplace( |
| 111 | 198 | get<0>(elem), | |
| 112 | 198 | value_from( get<1>(elem), ctx, obj.storage() )); | |
| 113 | 92 | } | |
| 114 | |||
| 115 | // ranges | ||
| 116 | template< class T, class Ctx > | ||
| 117 | void | ||
| 118 | 194 | value_from_impl(sequence_category, value& jv, T&& from, Ctx const& ctx) | |
| 119 | { | ||
| 120 | 194 | array& result = jv.emplace_array(); | |
| 121 | 194 | result.reserve(detail::try_size(from, size_implementation<T>())); | |
| 122 | using ForwardedValue = forwarded_value<T&&>; | ||
| 123 |
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12682 | for (auto&& elem : from) |
| 124 |
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12824 | result.emplace_back( |
| 125 | value_from( | ||
| 126 | // not a static_cast in order to appease clang < 4.0 | ||
| 127 |
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336 | ForwardedValue(elem), |
| 128 | ctx, | ||
| 129 | result.storage() )); | ||
| 130 | 194 | } | |
| 131 | |||
| 132 | // tuple-like types | ||
| 133 | template< class T, class Ctx > | ||
| 134 | void | ||
| 135 | 278 | value_from_impl(tuple_category, value& jv, T&& from, Ctx const& ctx) | |
| 136 | { | ||
| 137 | 278 | constexpr std::size_t n = | |
| 138 | std::tuple_size<remove_cvref<T>>::value; | ||
| 139 | 278 | array& arr = jv.emplace_array(); | |
| 140 | 278 | arr.reserve(n); | |
| 141 |
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278 | mp11::mp_for_each<mp11::mp_iota_c<n>>( |
| 142 | 278 | append_tuple_element< Ctx, T >{ arr, ctx, std::forward<T>(from) }); | |
| 143 | 278 | } | |
| 144 | |||
| 145 | // no suitable conversion implementation | ||
| 146 | template< class T, class Ctx > | ||
| 147 | void | ||
| 148 | value_from_impl(unknown_category, value&, T&&, Ctx const&) | ||
| 149 | { | ||
| 150 | static_assert( | ||
| 151 | !std::is_same<T, T>::value, | ||
| 152 | "No suitable tag_invoke overload found for the type"); | ||
| 153 | } | ||
| 154 | |||
| 155 | template< class Ctx, class T > | ||
| 156 | struct from_described_member | ||
| 157 | { | ||
| 158 | static_assert( | ||
| 159 | uniquely_named_members< remove_cvref<T> >::value, | ||
| 160 | "The type has several described members with the same name."); | ||
| 161 | |||
| 162 | using Ds = described_members< remove_cvref<T> >; | ||
| 163 | |||
| 164 | object& obj; | ||
| 165 | Ctx const& ctx; | ||
| 166 | T&& from; | ||
| 167 | |||
| 168 | template< class I > | ||
| 169 | void | ||
| 170 | operator()(I) const | ||
| 171 | { | ||
| 172 | using D = mp11::mp_at<Ds, I>; | ||
| 173 | obj.emplace( | ||
| 174 | D::name, | ||
| 175 | value_from( | ||
| 176 | static_cast<T&&>(from).* D::pointer, | ||
| 177 | ctx, | ||
| 178 | obj.storage())); | ||
| 179 | } | ||
| 180 | }; | ||
| 181 | |||
| 182 | // described classes | ||
| 183 | template< class T, class Ctx > | ||
| 184 | void | ||
| 185 | value_from_impl(described_class_category, value& jv, T&& from, Ctx const& ctx) | ||
| 186 | { | ||
| 187 | object& obj = jv.emplace_object(); | ||
| 188 | from_described_member<Ctx, T> member_converter{ | ||
| 189 | obj, ctx, static_cast<T&&>(from)}; | ||
| 190 | |||
| 191 | using Ds = typename decltype(member_converter)::Ds; | ||
| 192 | constexpr std::size_t N = mp11::mp_size<Ds>::value; | ||
| 193 | obj.reserve(N); | ||
| 194 | mp11::mp_for_each< mp11::mp_iota_c<N> >(member_converter); | ||
| 195 | } | ||
| 196 | |||
| 197 | // described enums | ||
| 198 | template< class T, class Ctx > | ||
| 199 | void | ||
| 200 | value_from_impl(described_enum_category, value& jv, T from, Ctx const&) | ||
| 201 | { | ||
| 202 | (void)jv; | ||
| 203 | (void)from; | ||
| 204 | #ifdef BOOST_DESCRIBE_CXX14 | ||
| 205 | char const* const name = describe::enum_to_string(from, nullptr); | ||
| 206 | if( name ) | ||
| 207 | { | ||
| 208 | string& str = jv.emplace_string(); | ||
| 209 | str.assign(name); | ||
| 210 | } | ||
| 211 | else | ||
| 212 | { | ||
| 213 | using Integer = typename std::underlying_type< remove_cvref<T> >::type; | ||
| 214 | jv = static_cast<Integer>(from); | ||
| 215 | } | ||
| 216 | #endif | ||
| 217 | } | ||
| 218 | |||
| 219 | // optionals | ||
| 220 | template< class T, class Ctx > | ||
| 221 | void | ||
| 222 | value_from_impl(optional_category, value& jv, T&& from, Ctx const& ctx) | ||
| 223 | { | ||
| 224 | if( from ) | ||
| 225 | value_from( *from, ctx, jv ); | ||
| 226 | else | ||
| 227 | jv = nullptr; | ||
| 228 | } | ||
| 229 | |||
| 230 | // variants | ||
| 231 | template< class Ctx > | ||
| 232 | struct value_from_visitor | ||
| 233 | { | ||
| 234 | value& jv; | ||
| 235 | Ctx const& ctx; | ||
| 236 | |||
| 237 | template<class T> | ||
| 238 | void | ||
| 239 | operator()(T&& t) | ||
| 240 | { | ||
| 241 | value_from( static_cast<T&&>(t), ctx, jv ); | ||
| 242 | } | ||
| 243 | }; | ||
| 244 | |||
| 245 | template< class Ctx, class T > | ||
| 246 | void | ||
| 247 | value_from_impl(variant_category, value& jv, T&& from, Ctx const& ctx) | ||
| 248 | { | ||
| 249 | visit( value_from_visitor<Ctx>{ jv, ctx }, static_cast<T&&>(from) ); | ||
| 250 | } | ||
| 251 | |||
| 252 | template< class Ctx, class T > | ||
| 253 | void | ||
| 254 | value_from_impl(path_category, value& jv, T&& from, Ctx const&) | ||
| 255 | { | ||
| 256 | std::string s = from.generic_string(); | ||
| 257 | string_view sv = s; | ||
| 258 | jv.emplace_string().assign(sv); | ||
| 259 | } | ||
| 260 | |||
| 261 | //---------------------------------------------------------- | ||
| 262 | // Contextual conversions | ||
| 263 | |||
| 264 | template< class Ctx, class T > | ||
| 265 | using value_from_category = conversion_category< | ||
| 266 | Ctx, T, value_from_conversion >; | ||
| 267 | |||
| 268 | } // detail | ||
| 269 | |||
| 270 | #ifndef BOOST_NO_CXX17_HDR_OPTIONAL | ||
| 271 | inline | ||
| 272 | void | ||
| 273 | tag_invoke( | ||
| 274 | value_from_tag, | ||
| 275 | value& jv, | ||
| 276 | std::nullopt_t) | ||
| 277 | { | ||
| 278 | // do nothing | ||
| 279 | BOOST_ASSERT(jv.is_null()); | ||
| 280 | (void)jv; | ||
| 281 | } | ||
| 282 | #endif | ||
| 283 | |||
| 284 | } // namespace json | ||
| 285 | } // namespace boost | ||
| 286 | |||
| 287 | #endif | ||
| 288 |