1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
#include "simdjson.h"
#include "test_ondemand.h"
#include <iostream>
#include <vector>
using namespace simdjson;
/**
* A custom type that we want to parse.
*/
struct Car {
std::string make{};
std::string model{};
int64_t year{};
std::vector<double> tire_pressure{};
bool operator==(const Car &other) const {
return make == other.make && model == other.model && year == other.year &&
tire_pressure == other.tire_pressure;
}
};
std::ostream &operator<<(std::ostream &os, const Car &c) {
os << c.make << " " << c.model << " " << c.year << " ";
for (auto p : c.tire_pressure) {
os << p << " ";
}
return os;
}
#if !SIMDJSON_SUPPORTS_CONCEPTS
// This code is not necessary if you have a C++20 compliant system:
template <>
simdjson_inline simdjson_result<std::vector<double>>
simdjson::ondemand::value::get() noexcept {
ondemand::array array;
auto error = get_array().get(array);
if (error) {
return error;
}
std::vector<double> vec;
for (auto v : array) {
double val;
error = v.get_double().get(val);
if (error) {
return error;
}
vec.push_back(val);
}
return vec;
}
#endif
template <>
simdjson_inline simdjson_result<Car> simdjson::ondemand::value::get() noexcept {
ondemand::object obj;
auto error = get_object().get(obj);
if (error) {
return error;
}
Car car;
if ((error = obj["make"].get_string(car.make))) {
return error;
}
if ((error = obj["model"].get_string(car.model))) {
return error;
}
if ((error = obj["year"].get_int64().get(car.year))) {
return error;
}
if ((error = obj["tire_pressure"].get<std::vector<double>>().get(
car.tire_pressure))) {
return error;
}
return car;
}
template <>
simdjson_inline simdjson_result<Car>
simdjson::ondemand::document::get() &noexcept {
ondemand::object obj;
auto error = get_object().get(obj);
if (error) {
return error;
}
Car car;
if ((error = obj["make"].get_string(car.make))) {
return error;
}
if ((error = obj["model"].get_string(car.model))) {
return error;
}
if ((error = obj["year"].get_int64().get(car.year))) {
return error;
}
if ((error = obj["tire_pressure"].get<std::vector<double>>().get(
car.tire_pressure))) {
return error;
}
return car;
}
template <>
simdjson_inline simdjson_result<Car>
simdjson::ondemand::document_reference::get() &noexcept {
ondemand::object obj;
auto error = get_object().get(obj);
if (error) {
return error;
}
Car car;
if ((error = obj["make"].get_string(car.make))) {
return error;
}
if ((error = obj["model"].get_string(car.model))) {
return error;
}
if ((error = obj["year"].get_int64().get(car.year))) {
return error;
}
if ((error = obj["tire_pressure"].get<std::vector<double>>().get(
car.tire_pressure))) {
return error;
}
return car;
}
int main_should_compile(void) {
padded_string json =
R"( [ { "make": "Toyota", "model": "Camry", "year": 2018,
"tire_pressure": [ 40.1, 39.9 ] },
{ "make": "Kia", "model": "Soul", "year": 2012,
"tire_pressure": [ 30.1, 31.0 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999,
"tire_pressure": [ 29.8, 30.0 ] }
])"_padded;
ondemand::parser parser;
ondemand::document doc;
[[maybe_unused]] auto doc_error = parser.iterate(json).get(doc);
for (auto val : doc) {
#if SIMDJSON_EXCEPTIONS
Car c(val); // an exception may be thrown
#else
Car c;
if (auto error = val.get<Car>().get(c)) {
std::cerr << error << std::endl;
return EXIT_FAILURE;
}
#endif
}
return EXIT_SUCCESS;
}
namespace car_error_tests {
bool car_deserialize() {
TEST_START();
padded_string json =
R"( [ { "make": "Toyota", "model": "Camry", "year": 2018,
"tire_pressure": [ 40.1, 39.9 ] },
{ "make": "Kia", "model": "Soul", "year": 2012,
"tire_pressure": [ 30.1, 31.0 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999,
"tire_pressure": [ 29.8, 30.0 ] }
])"_padded;
ondemand::parser parser;
ondemand::document doc;
[[maybe_unused]] auto doc_error = parser.iterate(json).get(doc);
std::vector<Car> cars;
for (auto val : doc) {
#if SIMDJSON_EXCEPTIONS
Car c(val); // an exception may be thrown
#else
Car c;
if (auto error = val.get<Car>().get(c)) {
std::cerr << error << std::endl;
return EXIT_FAILURE;
}
#endif
cars.push_back(c);
std::cout << c.make << std::endl;
}
std::vector<Car> expected = {{"Toyota", "Camry", 2018, {40.1, 39.9}},
{"Kia", "Soul", 2012, {30.1, 31.0}},
{"Toyota", "Tercel", 1999, {29.8, 30.0}}};
ASSERT_EQUAL(cars.size(), expected.size());
for (size_t i = 0; i < cars.size(); i++) {
ASSERT_EQUAL(cars[i], expected[i]);
}
TEST_SUCCEED();
}
bool car_doc_deserialize() {
TEST_START();
padded_string json = R"( { "make": "Toyota", "model": "Camry", "year": 2018,
"tire_pressure": [ 40.1, 39.9 ] }
)"_padded;
ondemand::parser parser;
ondemand::document doc;
[[maybe_unused]] auto doc_error = parser.iterate(json).get(doc);
#if SIMDJSON_EXCEPTIONS
Car c(doc); // an exception may be thrown
#else
Car c;
if (auto error = doc.get<Car>().get(c)) {
std::cerr << error << std::endl;
return EXIT_FAILURE;
}
#endif
Car expected = {"Toyota", "Camry", 2018, {40.1, 39.9}};
ASSERT_EQUAL(c, expected);
TEST_SUCCEED();
}
bool car_stream_deserialize() {
TEST_START();
padded_string json =
R"( { "make": "Toyota", "model": "Camry", "year": 2018,
"tire_pressure": [ 40.1, 39.9 ] }
{ "make": "Kia", "model": "Soul", "year": 2012,
"tire_pressure": [ 30.1, 31.0 ] }
{ "make": "Toyota", "model": "Tercel", "year": 1999,
"tire_pressure": [ 29.8, 30.0 ] }
)"_padded;
ondemand::parser parser;
ondemand::document_stream stream;
auto error = parser.iterate_many(json).get(stream);
if(error) {
std::cerr << error << std::endl;
return EXIT_FAILURE;
}
std::vector<Car> cars;
#if SIMDJSON_EXCEPTIONS
for(ondemand::document_reference doc : stream) {
//Car c(doc); // an exception may be thrown
cars.push_back(Car(doc)); // an exception may be thrown
}
#else
for(auto doc : stream) {
Car c;
if ((error = doc.get<Car>().get(c))) {
std::cerr << error << std::endl;
return EXIT_FAILURE;
}
cars.push_back(c);
}
#endif
std::vector<Car> expected = {{"Toyota", "Camry", 2018, {40.1, 39.9}},
{"Kia", "Soul", 2012, {30.1, 31.0}},
{"Toyota", "Tercel", 1999, {29.8, 30.0}}};
ASSERT_EQUAL(cars.size(), expected.size());
for (size_t i = 0; i < cars.size(); i++) {
ASSERT_EQUAL(cars[i], expected[i]);
}
TEST_SUCCEED();
}
bool run() { return car_stream_deserialize() && car_doc_deserialize() && car_deserialize(); }
} // namespace car_error_tests
int main(int argc, char *argv[]) {
return test_main(argc, argv, car_error_tests::run);
}
|
