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simdjson-simdjson/tests/ondemand/ondemand_readme_examples.cpp
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Daniel Lemire 6a47cda07f guarding
2025-09-26 22:34:36 -04:00

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#include "simdjson.h"
#include "test_ondemand.h"
#if __cpp_lib_optional >= 201606L
#include <optional>
#endif
#if SIMDJSON_CPLUSPLUS17
#include <charconv>
#endif
using namespace std;
using namespace simdjson;
using error_code = simdjson::error_code;
bool fatal_error() {
TEST_START();
padded_string badjson = R"( { "make": "Toyota", "model": "Camry", "year"})"_padded;
ondemand::parser parser;
ondemand::document doc;
auto errordoc = parser.iterate(badjson).get(doc);
if(errordoc != simdjson::SUCCESS) { return false; }
simdjson::ondemand::value v;
auto error = doc.get_object()["year"].get(v);
ASSERT_TRUE(simdjson::is_fatal(error));
ASSERT_FALSE(doc.is_alive());
TEST_SUCCEED();
}
bool to_string_object() {
TEST_START();
auto json = R"({"\u0062\u0065\u0062\u0065": 2} })"_padded;
ondemand::parser parser;
ondemand::document doc;
auto error = parser.iterate(json).get(doc);
if(error) { return false; }
ondemand::object object;
error = doc.get_object().get(object);
if(error) { return false; }
for (auto field : object) {
std::string key;
error = field.unescaped_key().get(key);
if(error) { return false; }
}
return true;
}
bool simplepad() {
std::string json = "[1]";
ondemand::parser parser;
ondemand::document doc;
auto error = parser.iterate(simdjson::pad(json)).get(doc);
return error == SUCCESS;
}
bool string1() {
const char * data = "my data"; // 7 bytes
simdjson::padded_string my_padded_data(data, 7); // copies to a padded buffer
std::cout << my_padded_data << std::endl;
TEST_SUCCEED();
}
bool string2() {
std::string data = "my data";
simdjson::padded_string my_padded_data(data); // copies to a padded buffer
std::cout << my_padded_data << std::endl;
TEST_SUCCEED();
}
bool to_string_example_no_except() {
TEST_START();
auto json = R"({
"name": "Daniel",
"age": 42
})"_padded;
ondemand::parser parser;
ondemand::document doc;
auto err = parser.iterate(json).get(doc);
if(err) { return false; }
std::string name;
err = doc["name"].get_string(name);
if(err) { return false; }
TEST_SUCCEED();
}
struct Car {
Car() : make(), model(), year(), tire_pressure() {}
std::string make;
std::string model;
int64_t year;
std::vector<double> tire_pressure;
};
#ifndef __cpp_concepts
template <>
simdjson_inline simdjson_result<std::vector<double>>
simdjson::ondemand::value::get() noexcept {
// This works on a value, if the std::vector<double> is the document, we need to also implement
// simdjson::ondemand::document::get<std::vector<double>>.
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;
}
int custom_type_without_exceptions() {
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;
auto error = parser.iterate(json).get(doc);
if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
for (auto val : doc) {
Car c;
error = val.get<Car>().get(c);
if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
std::cout << c.make << std::endl;
}
return 0;
}
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;
// Instead of repeatedly obj["something"], we iterate through the object which
// we expect to be faster.
for (auto field : obj) {
raw_json_string key;
error = field.key().get(key);
if (error) { return error; }
if (key == "make") {
error = field.value().get_string(car.make);
if (error) { return error; }
} else if (key == "model") {
error = field.value().get_string(car.model);
if (error) { return error; }
} else if (key == "year") {
error = field.value().get_int64().get(car.year);
if (error) { return error; }
} else if (key == "tire_pressure") {
error = field.value().get<std::vector<double>>().get(car.tire_pressure);
if (error) { return error; }
}
}
return car;
}
#if SIMDJSON_EXCEPTIONS
void main_capture() {
padded_string json_padded = "{\"a\":[1,2,3], \"b\": 2, \"c\": \"hello\"}"_padded;
std::vector<std::string_view> fields;
ondemand::parser parser;
auto doc = parser.iterate(json_padded);
auto object = doc.get_object();
for (auto field : object) {
fields.push_back(field.value().raw_json());
}
// Output the fields
// Expected output:
// [1,2,3]
// 2
// "hello"
for (std::string_view field_ref : fields) {
std::cout << field_ref << std::endl;
}
}
int custom_type_on_document() {
padded_string json = R"( { "make": "Toyota", "model": "Camry", "year": 2018,
"tire_pressure": [ 40.1, 39.9 ] } )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
Car c(doc);
std::cout << c.make << std::endl;
return 0;
}
int custom_type_with_exceptions() {
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 = parser.iterate(json);
for (auto value : doc) {
Car c(value);
std::cout << c.make << std::endl;
}
return 0;
}
bool to_string_example() {
TEST_START();
auto json = R"({
"name": "Daniel",
"age": 42
})"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
std::string name;
ASSERT_SUCCESS(doc["name"].get_string(name));
ASSERT_EQUAL(name, "Daniel");
TEST_SUCCEED();
}
#if SIMDJSON_STATIC_REFLECTION
bool partial_car_extract() {
TEST_START();
auto json = R"( {
"make": "Toyota",
"model": "Camry",
"year": 2024,
"tire_pressure": [ 40.1, 39.9 ]
} )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
Car car{};
ASSERT_SUCCESS( (doc.extract_into<"make","model">(car)) );
ASSERT_EQUAL(car.make, "Toyota");
ASSERT_EQUAL(car.model, "Camry");
ASSERT_EQUAL(car.year, 0); // Not extracted
ASSERT_EQUAL(car.tire_pressure.size(), 0); // Not extracted
TEST_SUCCEED();
}
bool temperature_example() {
TEST_START();
struct complicated_weather_data {
std::vector<std::string> time;
std::vector<float> temperature;
};
auto padded = R"({"time":["2023-03-15T12:00:00Z"],"temperature":[42]})"_padded;
simdjson::ondemand::parser parser;
simdjson::ondemand::document doc = parser.iterate(padded);
complicated_weather_data p = doc.get<complicated_weather_data>();
ASSERT_EQUAL(p.time.size(), 1);
ASSERT_EQUAL(p.time[0], "2023-03-15T12:00:00Z");
ASSERT_EQUAL(p.temperature.size(), 1);
ASSERT_EQUAL(p.temperature[0], 42);
TEST_SUCCEED();
}
#endif // SIMDJSON_STATIC_REFLECTION
bool gen_raw1() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string docdata = R"({"value":123})"_padded;
simdjson::ondemand::document doc = parser.iterate(docdata);
simdjson::ondemand::object obj = doc.get_object();
string_view token = obj.raw_json(); // gives you `{"value":123}`
ASSERT_EQUAL(token, R"({"value":123})");
TEST_SUCCEED();
}
bool gen_raw2() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string docdata = R"([1,2,3])"_padded;
simdjson::ondemand::document doc = parser.iterate(docdata);
simdjson::ondemand::array arr = doc.get_array();
string_view token = arr.raw_json(); // gives you `[1,2,3]`
ASSERT_EQUAL(token, R"([1,2,3])");
TEST_SUCCEED();
}
bool jsondollar() {
TEST_START();
auto json = R"( { "c" :{ "foo": { "a": [ 10, 20, 30 ] }}, "d": { "foo2": { "a": [ 10, 20, 30 ] }} , "e": 120 })"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
ondemand::object obj = doc.get_object();
int64_t x = obj.at_path("$.c.foo.a[1]"); // 20
ASSERT_EQUAL(x, 20);
x = obj.at_path("$.d.foo2.a.2"); // 30
ASSERT_EQUAL(x, 30);
TEST_SUCCEED();
}
bool gen_raw3() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string docdata = R"({"value":123})"_padded;
simdjson::ondemand::document doc = parser.iterate(docdata);
simdjson::ondemand::object obj = doc.get_object();
string_view token = obj.raw_json(); // gives you `{"value":123}`
ASSERT_EQUAL(token, R"({"value":123})");
obj.reset(); // revise the object
uint64_t x = obj["value"]; // gives me 123
ASSERT_EQUAL(x, 123);
TEST_SUCCEED();
}
bool at_end() {
TEST_START();
auto json = R"([1, 2] foo ])"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
ondemand::array array = doc.get_array();
for (uint64_t values : array) {
std::cout << values << std::endl;
}
if(!doc.at_end()) {
std::cerr << "trailing content at byte index " << doc.current_location() - json.data() << std::endl;
}
TEST_SUCCEED();
}
bool at_end_array() {
TEST_START();
auto json = R"(["extra close"]])"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
ondemand::array array = doc.get_array();
for (std::string_view values : array) {
std::cout << values << std::endl;
}
if(!doc.at_end()) {
std::cerr << "trailing content at byte index " << doc.current_location() - json.data() << std::endl;
}
TEST_SUCCEED();
}
bool examplecrt() {
TEST_START();
padded_string padded_input_json = R"([
{ "monitor": [
{ "id": "monitor", "type": "toggle", "label": "monitor" },
{ "id": "profile", "type": "selector", "label": "collection" },
{ "id": "overlay", "type": "selector", "label": "overlay" },
{ "id": "zoom", "type": "toggleSlider", "label": "zoom" }
] },
{ "crt": [
{ "id": "system", "type": "multi", "label": "system", "choices": "PAL, NTSC" },
{ "type": "spacer" },
{ "id": "brightness", "type": "slider", "icon": "brightness" },
{ "id": "contrast", "type": "slider", "icon": "contrast" },
{ "id": "saturation", "type": "slider", "icon": "saturation" },
{ "type": "spacer" },
{ "id": "overscan", "type": "toggleSlider", "label": "overscan" },
{ "type": "spacer" },
{ "id": "emulation", "type": "toggle", "label": "CRT emulation" },
{ "type": "spacer" },
{ "id": "curve", "type": "toggleSlider", "label": "curve" },
{ "id": "bleed", "type": "toggleSlider", "label": "bleed" },
{ "id": "vignette", "type": "toggleSlider", "label": "vignette" },
{ "id": "scanlines", "type": "toggleSlider", "label": "scanlines" },
{ "id": "gridlines", "type": "toggleSlider", "label": "gridlines" },
{ "id": "glow", "type": "toggleSlider", "label": "glow" },
{ "id": "flicker", "type": "toggleSlider", "label": "flicker" },
{ "id": "noise", "type": "toggleSlider", "label": "noise" },
{}
] }
])"_padded;
auto parser = ondemand::parser{};
auto doc = parser.iterate(padded_input_json);
auto root_array = doc.get_array();
// the root should be an object, not an array, but that's the JSON we are
// given.
for (ondemand::object node : root_array) {
// We know that we are going to have just one element in the object.
for (auto field : node) {
std::cout << "\n\ntop level:" << field.key() << std::endl;
// You can get a proper std::string_view for the key with:
// std::string_view key = field.unescaped_key();
// and second for-range loop to get child-elements here
for (ondemand::object inner_object : field.value()) {
auto i = inner_object.begin();
if (i == inner_object.end()) {
std::cout << "empty object" << std::endl;
continue;
} else {
for (; i != inner_object.end(); ++i) {
auto inner_field = *i;
std::cout << '"' << inner_field.key()
<< "\" : " << inner_field.value() << ", ";
// You can get proper std::string_view for the key and value with:
// std::string_view inner_key = field.unescaped_key();
// std::string_view value_str = field.value();
}
}
std::cout << std::endl;
}
// You can break here if you only want just the first element.
// break;
}
}
TEST_SUCCEED();
}
bool examplecrt_realloc() {
TEST_START();
std::string unpadded_input_json = R"([
{ "monitor": [
{ "id": "monitor", "type": "toggle", "label": "monitor" },
{ "id": "profile", "type": "selector", "label": "collection" },
{ "id": "overlay", "type": "selector", "label": "overlay" },
{ "id": "zoom", "type": "toggleSlider", "label": "zoom" }
] },
{ "crt": [
{ "id": "system", "type": "multi", "label": "system", "choices": "PAL, NTSC" },
{ "type": "spacer" },
{ "id": "brightness", "type": "slider", "icon": "brightness" },
{ "id": "contrast", "type": "slider", "icon": "contrast" },
{ "id": "saturation", "type": "slider", "icon": "saturation" },
{ "type": "spacer" },
{ "id": "overscan", "type": "toggleSlider", "label": "overscan" },
{ "type": "spacer" },
{ "id": "emulation", "type": "toggle", "label": "CRT emulation" },
{ "type": "spacer" },
{ "id": "curve", "type": "toggleSlider", "label": "curve" },
{ "id": "bleed", "type": "toggleSlider", "label": "bleed" },
{ "id": "vignette", "type": "toggleSlider", "label": "vignette" },
{ "id": "scanlines", "type": "toggleSlider", "label": "scanlines" },
{ "id": "gridlines", "type": "toggleSlider", "label": "gridlines" },
{ "id": "glow", "type": "toggleSlider", "label": "glow" },
{ "id": "flicker", "type": "toggleSlider", "label": "flicker" },
{ "id": "noise", "type": "toggleSlider", "label": "noise" },
{}
] }
])";
unpadded_input_json.shrink_to_fit();
auto parser = ondemand::parser{};
auto doc = parser.iterate(unpadded_input_json);
auto root_array = doc.get_array();
// the root should be an object, not an array, but that's the JSON we are
// given.
for (ondemand::object node : root_array) {
// We know that we are going to have just one element in the object.
for (auto field : node) {
std::cout << "\n\ntop level:" << field.key() << std::endl;
// You can get a proper std::string_view for the key with:
// std::string_view key = field.unescaped_key();
// and second for-range loop to get child-elements here
for (ondemand::object inner_object : field.value()) {
auto i = inner_object.begin();
if (i == inner_object.end()) {
std::cout << "empty object" << std::endl;
continue;
} else {
for (; i != inner_object.end(); ++i) {
auto inner_field = *i;
std::cout << '"' << inner_field.key()
<< "\" : " << inner_field.value() << ", ";
// You can get proper std::string_view for the key and value with:
// std::string_view inner_key = field.unescaped_key();
// std::string_view value_str = field.value();
}
}
std::cout << std::endl;
}
// You can break here if you only want just the first element.
// break;
}
}
TEST_SUCCEED();
}
#if SIMDJSON_CPLUSPLUS17
bool big_int_array() {
TEST_START();
ondemand::parser parser;
padded_string docdata = R"([-9223372036854775809, 18446744073709551617, 99999999999999999999999 ])"_padded;
std::string expected[] = {"-9223372036854775809", "18446744073709551617", "99999999999999999999999 "};
ondemand::document doc = parser.iterate(docdata);
ondemand::array arr = doc.get_array();
size_t i = 0;
for(ondemand::value val : arr) {
if(i > 3) {
std::cerr << "unexpected number of elements" << std::endl;
return false;
}
if(val.get_number_type() != ondemand::number_type::big_integer) {
std::cerr << "unexpected number type" << std::endl;
std::cout << val.get_number_type() << std::endl;
std::cout << val.raw_json_token() << std::endl;
return false;
}
std::string_view token = val.raw_json_token();
std::string_view expected_token = expected[i];
if(token != expected_token) {
std::cerr << "unexpected token: " << token << " expected: " << expected_token << std::endl;
return false;
}
i++;
}
if(i != 3) {
std::cerr << "unexpected number of elements" << std::endl;
return false;
}
TEST_SUCCEED();
}
#endif
bool big_int_array_as_double() {
TEST_START();
ondemand::parser parser;
padded_string docdata = R"([-9223372036854775809, 18446744073709551617, 99999999999999999999999 ])"_padded;
double dexpected[] = {-9223372036854775808.0, 18446744073709551616.0, 1e23};
ondemand::document doc = parser.iterate(docdata);
ondemand::array arr = doc.get_array();
size_t i = 0;
for(ondemand::value val : arr) {
if(i > 3) {
std::cerr << "unexpected number of elements" << std::endl;
return false;
}
if((val.get_number_type() != ondemand::number_type::big_integer) || (dexpected[i] != val.get_double())) {
return false;
}
i++;
}
if(i != 3) {
std::cerr << "unexpected number of elements" << std::endl;
return false;
}
TEST_SUCCEED();
}
bool number_tests() {
TEST_START();
ondemand::parser parser;
padded_string docdata = R"([1.0, 3, 1, 3.1415,-13231232,9999999999999999999,12345678901234567890123])"_padded;
ondemand::document doc = parser.iterate(docdata);
ondemand::array arr = doc.get_array();
for(ondemand::value val : arr) {
std::cout << val << " ";
std::cout << "negative: " << val.is_negative() << " ";
std::cout << "is_integer: " << val.is_integer() << " ";
// direct computation without materializing the number:
ondemand::number_type dt = val.get_number_type();
ondemand::number num;
auto res = val.get_number().get(num);
ondemand::number_type t = num.get_number_type();
if(t != dt && res != BIGINT_ERROR) { throw std::runtime_error("bug"); }
switch(dt) {
case ondemand::number_type::signed_integer:
std::cout << "integer: " << int64_t(num) << " ";
std::cout << "integer: " << num.get_int64() << std::endl;
break;
case ondemand::number_type::unsigned_integer:
std::cout << "large 64-bit integer: " << uint64_t(num) << " ";
std::cout << "large 64-bit integer: " << num.get_uint64() << std::endl;
break;
case ondemand::number_type::floating_point_number:
std::cout << "float: " << double(num) << " ";
std::cout << "float: " << num.get_double() << std::endl;
break;
case ondemand::number_type::big_integer:
std::cout << "big-integer: " << val.raw_json_token() << std::endl;
break;
}
}
TEST_SUCCEED();
}
bool recursive_print_json(ondemand::value element) {
TEST_START();
bool add_comma;
switch (element.type()) {
case ondemand::json_type::array:
cout << "[";
add_comma = false;
for (auto child : element.get_array()) {
if (add_comma) {
cout << ",";
}
// We need the call to value() to get
// an ondemand::value type.
recursive_print_json(child.value());
add_comma = true;
}
cout << "]";
break;
case ondemand::json_type::object:
cout << "{";
add_comma = false;
for (auto field : element.get_object()) {
if (add_comma) {
cout << ",";
}
// key() returns the key as it appears in the raw
// JSON document, if we want the unescaped key,
// we should do field.unescaped_key().
cout << "\"" << field.key() << "\": ";
recursive_print_json(field.value());
add_comma = true;
}
cout << "}\n";
break;
case ondemand::json_type::number:
// assume it fits in a double
cout << element.get_double();
break;
case ondemand::json_type::string:
// get_string() would return escaped string, but
// we are happy with unescaped string.
cout << "\"" << element.get_raw_json_string() << "\"";
break;
case ondemand::json_type::boolean:
cout << element.get_bool();
break;
case ondemand::json_type::null:
// we check that the value is indeed null
// otherwise: an error is thrown.
if(element.is_null()) {
cout << "null";
}
break;
case ondemand::json_type::unknown:
cout << "undefined";
break;
}
TEST_SUCCEED();
}
bool basics_treewalk() {
TEST_START();
padded_string json[3] = {R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded, R"( {"key":"value"} )"_padded, "[12,3]"_padded};
ondemand::parser parser;
for(size_t i = 0 ; i < 3; i++) {
ondemand::document doc = parser.iterate(json[i]);
ondemand::value val = doc;
recursive_print_json(val);
std::cout << std::endl;
}
TEST_SUCCEED();
}
bool print_depth_space(ondemand::value element) {
TEST_START();
for(auto i = 0; i < element.current_depth(); i++) {
cout << " ";
}
TEST_SUCCEED();
}
bool recursive_print_json_breakline(ondemand::value element) {
TEST_START();
bool add_comma;
switch (element.type()) {
case ondemand::json_type::array:
cout << endl;
print_depth_space(element);
cout << "[";
add_comma = false;
for (auto child : element.get_array()) {
if (add_comma) {
print_depth_space(element);
cout << ",";
}
// We need the call to value() to get
// an ondemand::value type.
recursive_print_json_breakline(child.value());
add_comma = true;
}
cout << "]";
break;
case ondemand::json_type::object:
cout << endl;
print_depth_space(element);
cout << "{";
add_comma = false;
for (auto field : element.get_object()) {
if (add_comma) {
print_depth_space(element);
cout << ",";
}
// key() returns the key as it appears in the raw
// JSON document, if we want the unescaped key,
// we should do field.unescaped_key().
cout << "\"" << field.key() << "\": ";
recursive_print_json_breakline(field.value());
add_comma = true;
}
cout << "}\n";
break;
case ondemand::json_type::number:
// assume it fits in a double
cout << element.get_double();
break;
case ondemand::json_type::string:
// get_string() would return escaped string, but
// we are happy with unescaped string.
cout << "\"" << element.get_raw_json_string() << "\"";
break;
case ondemand::json_type::boolean:
cout << element.get_bool();
break;
case ondemand::json_type::null:
// We check that the value is indeed null
// otherwise: an error is thrown.
if(element.is_null()) {
cout << "null";
}
break;
case ondemand::json_type::unknown:
cout << "undefined";
break;
}
TEST_SUCCEED();
}
bool basics_treewalk_breakline() {
TEST_START();
padded_string json[3] = {R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded, R"( {"key":"value"} )"_padded, "[12,3]"_padded};
ondemand::parser parser;
for(size_t i = 0 ; i < 3; i++) {
ondemand::document doc = parser.iterate(json[i]);
ondemand::value val = doc;
recursive_print_json_breakline(val);
std::cout << std::endl;
}
TEST_SUCCEED();
}
bool basics_1() {
TEST_START();
ondemand::parser parser;
auto json = padded_string::load("twitter.json");
ondemand::document doc = parser.iterate(json); // load and parse a file
simdjson_unused auto unused_doc = doc.get_object();
TEST_SUCCEED();
}
bool basics_2() {
TEST_START();
ondemand::parser parser;
auto json = "[1,2,3]"_padded; // The _padded suffix creates a simdjson::padded_string instance
ondemand::document doc = parser.iterate(json); // parse a string
simdjson_unused auto unused_doc = doc.get_array();
TEST_SUCCEED();
}
bool basics_3() {
TEST_START();
ondemand::parser parser;
char json[3+SIMDJSON_PADDING];
strcpy(json, "[1]");
ondemand::document doc = parser.iterate(json, strlen(json), sizeof(json));
simdjson_unused auto unused_doc = doc.get_array();
TEST_SUCCEED();
}
bool json_array_with_array_count() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [ 40.1, 39.9, 37.7, 40.4 ] )"_padded;
auto doc = parser.iterate(cars_json);
auto arr = doc.get_array();
size_t count = arr.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
// We deliberately do it twice:
count = arr.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
// Next, we check whether we can iterate normally:
std::vector<double> values(count);
size_t index = 0;
for(double x : arr) { values[index++] = x; }
ASSERT_EQUAL(index, count);
TEST_SUCCEED();
}
bool json_value_with_array_count() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( {"array":[ 40.1, 39.9, 37.7, 40.4 ]} )"_padded;
auto doc = parser.iterate(cars_json);
auto val = doc["array"];
size_t count = val.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
// We deliberately do it twice:
count = val.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
std::vector<double> values(count);
// Next, we check whether we can iterate normally:
size_t index = 0;
for(double x : val) { values[index++] = x; }
ASSERT_EQUAL(index, count);
TEST_SUCCEED();
}
bool json_array_count() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [ 40.1, 39.9, 37.7, 40.4 ] )"_padded;
auto doc = parser.iterate(cars_json);
size_t count = doc.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
// We deliberately do it twice:
count = doc.count_elements();
ASSERT_EQUAL(4, count);
std::cout << count << std::endl;
std::vector<double> values(count);
size_t index = 0;
for(double x : doc) { values[index++] = x; }
ASSERT_EQUAL(index, count);
TEST_SUCCEED();
}
bool json_array_count_complex() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( { "test":[ { "val1":1, "val2":2 }, { "val1":1, "val2":2 }, { "val1":1, "val2":2 } ] } )"_padded;
auto doc = parser.iterate(cars_json);
auto test_array = doc.find_field("test").get_array();
size_t count = test_array.count_elements();
std::cout << "Number of elements: " << count << std::endl;
size_t c = 0;
for(ondemand::object elem : test_array) {
std::cout << simdjson::to_json_string(elem);
c++;
}
std::cout << std::endl;
ASSERT_EQUAL(c, count);
TEST_SUCCEED();
}
bool json_object_count() {
TEST_START();
auto json = R"( { "test":{ "val1":1, "val2":2 } } )"_padded;
ondemand::parser parser;
ondemand::document doc;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
size_t count;
ASSERT_SUCCESS(doc.count_fields().get(count));
ASSERT_EQUAL(count,1);
ondemand::object object;
size_t new_count;
ASSERT_SUCCESS(doc.find_field("test").get_object().get(object));
ASSERT_SUCCESS(object.count_fields().get(new_count));
ASSERT_EQUAL(new_count, 2);
TEST_SUCCEED();
}
bool using_the_parsed_json_1() {
TEST_START();
try {
ondemand::parser parser;
auto json = R"( { "x": 1, "y": 2 } )"_padded;
auto doc = parser.iterate(json);
double y = doc.find_field("y"); // The cursor is now after the 2 (at })
double x = doc.find_field("x"); // This fails, because there are no more fields after "y"
cout << x << ", " << y << endl;
} catch (...) {
TEST_SUCCEED();
}
TEST_FAIL("expected an exception");
}
bool using_the_parsed_json_2() {
TEST_START();
ondemand::parser parser;
auto json = R"( { "x": 1, "y": 2 } )"_padded;
auto doc = parser.iterate(json);
double y = doc["y"]; // The cursor is now after the 2 (at })
double x = doc["x"]; // Success: [] loops back around to find "x"
cout << x << ", " << y << endl;
TEST_SUCCEED();
}
bool big_integer() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string docdata = R"({"value":12321323213213213213213213213211223})"_padded;
simdjson::ondemand::document doc = parser.iterate(docdata);
simdjson::ondemand::object obj = doc.get_object();
string_view token = obj["value"].raw_json_token();
std::cout << token << std::endl;
// token == "12321323213213213213213213213211223"
TEST_SUCCEED();
}
bool big_integer_in_string() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string docdata = R"({"value":"12321323213213213213213213213211223"})"_padded;
simdjson::ondemand::document doc = parser.iterate(docdata);
simdjson::ondemand::object obj = doc.get_object();
string_view token = obj["value"].raw_json_token();
std::cout << token << std::endl;
// token == "\"12321323213213213213213213213211223\""
TEST_SUCCEED();
}
bool using_the_parsed_json_3() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded;
// Iterating through an array of objects
for (ondemand::object car : parser.iterate(cars_json)) {
// Accessing a field by name
cout << "Make/Model: " << std::string_view(car["make"]) << "/" << std::string_view(car["model"]) << endl;
// Casting a JSON element to an integer
uint64_t year = car["year"];
cout << "- This car is " << 2020 - year << " years old." << endl;
// Iterating through an array of floats
double total_tire_pressure = 0;
for (double tire_pressure : car["tire_pressure"]) {
total_tire_pressure += tire_pressure;
}
cout << "- Average tire pressure: " << (total_tire_pressure / 4) << endl;
}
TEST_SUCCEED();
}
bool using_the_parsed_json_3b() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( {
"identifier1":{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
"identifier2":{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
"identifier3":{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
} )"_padded;
// Iterating through an array of objects
ondemand::document doc = parser.iterate(cars_json);
for (ondemand::field key_car : doc.get_object()) {
// If I need a string_view and/or, I can use key_car.unescaped_key() instead, but
// key_car.key() will be more performant otherwise.
cout << "identifier : " << key_car.key() << std::endl;
// I can now access the subobject:
ondemand::object car = key_car.value();
// Accessing a field by name
cout << "Make/Model: " << std::string_view(car["make"]) << "/" << std::string_view(car["model"]) << endl;
// Casting a JSON element to an integer
uint64_t year = car["year"];
cout << "- This car is " << 2020 - year << "years old." << endl;
// Iterating through an array of floats
double total_tire_pressure = 0;
for (double tire_pressure : car["tire_pressure"]) {
total_tire_pressure += tire_pressure;
}
cout << "- Average tire pressure: " << (total_tire_pressure / 4) << endl;
}
TEST_SUCCEED();
}
bool using_the_parsed_json_rewind() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded;
auto doc = parser.iterate(cars_json);
size_t count = 0;
for (simdjson_unused ondemand::object car : doc) {
if(car["make"] == "Toyota") { count++; }
}
std::cout << "We have " << count << " Toyota cars.\n";
doc.rewind();
for (ondemand::object car : doc) {
cout << "Make/Model: " << std::string_view(car["make"]) << "/" << std::string_view(car["model"]) << endl;
}
TEST_SUCCEED();
}
bool using_the_parsed_json_rewind_array() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded;
auto doc = parser.iterate(cars_json);
ondemand::array arr = doc.get_array();
size_t count = 0;
for (simdjson_unused ondemand::object car : arr) {
if(car["make"] == "Toyota") { count++; }
}
std::cout << "We have " << count << " Toyota cars.\n";
arr.reset();
for (ondemand::object car : arr) {
cout << "Make/Model: " << std::string_view(car["make"]) << "/" << std::string_view(car["model"]) << endl;
}
TEST_SUCCEED();
}
bool using_the_parsed_json_4() {
TEST_START();
ondemand::parser parser;
auto points_json = R"( [
{ "12345" : {"x":12.34, "y":56.78, "z": 9998877} },
{ "12545" : {"x":11.44, "y":12.78, "z": 11111111} }
] )"_padded;
// Parse and iterate through an array of objects
for (ondemand::object points : parser.iterate(points_json)) {
// Iterating through an object, you iterate through key-value pairs (a 'field').
for (auto point : points) {
// Get the key corresponding the the field 'point'.
cout << "id: " << std::string_view(point.unescaped_key()) << ": (";
// Get the value corresponding the the field 'point'.
ondemand::object xyz = point.value();
cout << xyz["x"].get_double() << ", ";
cout << xyz["y"].get_double() << ", ";
cout << xyz["z"].get_int64() << endl;
}
}
TEST_SUCCEED();
}
bool using_the_parsed_json_5() {
TEST_START();
auto abstract_json = R"(
{ "str" : { "123" : {"abc" : 3.14 } } }
)"_padded;
ondemand::parser parser;
auto doc = parser.iterate(abstract_json);
cout << doc["str"]["123"]["abc"].get_double() << endl; // Prints 3.14
TEST_SUCCEED();
}
#endif // SIMDJSON_EXCEPTIONS
bool using_the_parsed_json_no_exceptions() {
TEST_START();
ondemand::parser parser;
auto cars_json = R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded;
ondemand::document doc;
// Iterating through an array of objects
auto error = parser.iterate(cars_json).get(doc);
if(error) { std::cerr << error << std::endl; return false; }
ondemand::array cars;
error = doc.get_array().get(cars);
for (auto car_value : cars) {
ondemand::object car;
error = car_value.get_object().get(car);
if(error) { std::cerr << error << std::endl; return false; }
// Accessing a field by name
std::string_view make;
std::string_view model;
error = car["make"].get(make);
if(error) { std::cerr << error << std::endl; return false; }
error = car["model"].get(model);
if(error) { std::cerr << error << std::endl; return false; }
cout << "Make/Model: " << make << "/" << model << endl;
// Casting a JSON element to an integer
uint64_t year{};
error = car["year"].get(year);
if(error) { std::cerr << error << std::endl; return false; }
cout << "- This car is " << 2020 - year << " years old." << endl;
// Iterating through an array of floats
double total_tire_pressure = 0;
ondemand::array pressures;
error = car["tire_pressure"].get_array().get(pressures);
if(error) { std::cerr << error << std::endl; return false; }
for (auto tire_pressure_value : pressures) {
double tire_pressure;
error = tire_pressure_value.get_double().get(tire_pressure);
if(error) { std::cerr << error << std::endl; return false; }
total_tire_pressure += tire_pressure;
}
cout << "- Average tire pressure: " << (total_tire_pressure / 4) << endl;
}
TEST_SUCCEED();
}
int using_the_parsed_json_6_process() {
auto abstract_json = R"(
{ "str" : { "123" : {"abc" : 3.14 } } }
)"_padded;
ondemand::parser parser;
double value;
auto doc = parser.iterate(abstract_json);
auto error = doc["str"]["123"]["abc"].get(value);
if (error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
cout << value << endl; // Prints 3.14
return EXIT_SUCCESS;
}
bool exception_free_object_loop() {
auto json = R"({"k\u0065y": 1})"_padded;
ondemand::parser parser;
ondemand::document doc;
auto error = parser.iterate(json).get(doc);
if(error) { return false; }
ondemand::object object;
error = doc.get_object().get(object);
if(error) { return false; }
for(auto field : object) {
std::string_view keyv;
error = field.unescaped_key().get(keyv);
if(error) { return false; }
if(keyv == "key") {
uint64_t intvalue;
error = field.value().get(intvalue);
if(error) { return false; }
std::cout << intvalue;
}
}
return true;
}
bool exception_free_object_loop_no_escape() {
auto json = R"({"k\u0065y": 1})"_padded;
ondemand::parser parser;
ondemand::document doc;
auto error = parser.iterate(json).get(doc);
if(error) { return false; }
ondemand::object object;
error = doc.get_object().get(object);
if(error) { return false; }
for(auto field : object) {
ondemand::raw_json_string keyv;
error = field.key().get(keyv);
/**
* If you need to escape the keys, you can do
* std::string_view keyv;
* error = field.unescaped_key().get(keyv);
*/
if(error) { return false; }
if(keyv == "key") {
uint64_t intvalue;
error = field.value().get(intvalue);
if(error) { return false; }
std::cout << intvalue;
}
}
return true;
}
bool using_the_parsed_json_6() {
TEST_START();
ASSERT_EQUAL(using_the_parsed_json_6_process(), EXIT_SUCCESS);
TEST_SUCCEED();
}
const padded_string cars_json = R"( [
{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
{ "make": "Kia", "model": "Soul", "year": 2012, "tire_pressure": [ 30.1, 31.0, 28.6, 28.7 ] },
{ "make": "Toyota", "model": "Tercel", "year": 1999, "tire_pressure": [ 29.8, 30.0, 30.2, 30.5 ] }
] )"_padded;
bool json_pointer_simple() {
TEST_START();
ondemand::parser parser;
ondemand::document cars;
double x;
ASSERT_SUCCESS(parser.iterate(cars_json).get(cars));
ASSERT_SUCCESS(cars.at_pointer("/0/tire_pressure/1").get(x));
ASSERT_EQUAL(x,39.9);
TEST_SUCCEED();
}
bool json_pointer_unicode() {
TEST_START();
const padded_string json = u8"{\"\u00E9\":123}"_padded;
ondemand::parser parser;
ondemand::document doc;
int64_t x;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
ASSERT_SUCCESS(doc.at_pointer((const char*)u8"/\u00E9").get(x));
ASSERT_EQUAL(x,123);
const padded_string json2 = "{\"\\u00E9\":123}"_padded;
ASSERT_SUCCESS(parser.iterate(json2).get(doc));
ASSERT_SUCCESS(doc.at_pointer("/\\u00E9").get(x));
ASSERT_ERROR(doc.at_pointer((const char*)u8"/\u00E9"), NO_SUCH_FIELD);
ASSERT_EQUAL(x,123);
TEST_SUCCEED();
}
bool json_path_simple() {
TEST_START();
ondemand::parser parser;
ondemand::document cars;
double x;
ASSERT_SUCCESS(parser.iterate(cars_json).get(cars));
ASSERT_SUCCESS(cars.at_path("[0].tire_pressure[1]").get(x));
ASSERT_EQUAL(x,39.9);
TEST_SUCCEED();
}
bool json_path_unicode() {
TEST_START();
ondemand::parser parser;
ondemand::document doc;
const padded_string json = u8"{\"\u00E9\":123}"_padded;
int64_t x;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
ASSERT_SUCCESS(doc.at_path((const char*)u8".\u00E9").get(x));
ASSERT_EQUAL(x,123);
const padded_string json2 = "{\"\\u00E9\":123}"_padded;
ASSERT_SUCCESS(parser.iterate(json2).get(doc));
ASSERT_SUCCESS(doc.at_path(".\\u00E9").get(x));
ASSERT_ERROR(doc.at_path((const char*)u8".\u00E9"), NO_SUCH_FIELD);
ASSERT_EQUAL(x,123);
TEST_SUCCEED();
}
bool invalid_json_path() {
TEST_START();
ondemand::parser parser;
ondemand::document cars;
double x;
ASSERT_SUCCESS(parser.iterate(cars_json).get(cars));
ASSERT_ERROR(cars.at_path("[0].tire_presure[1").get(x), INVALID_JSON_POINTER); // Fails on conversion to JSON Pointer
ASSERT_ERROR(cars.at_path("[0].incorrect_field[1]").get(x), NO_SUCH_FIELD); // Fails on at_pointer()
TEST_SUCCEED();
}
bool json_pointer_multiple() {
TEST_START();
using namespace std::string_literals;
ondemand::parser parser;
ondemand::document cars;
size_t size;
ASSERT_SUCCESS(parser.iterate(cars_json).get(cars));
ASSERT_SUCCESS(cars.count_elements().get(size));
double expected[] = {39.9, 31, 30};
for (size_t i = 0; i < size; i++) {
std::string json_pointer = "/"s + std::to_string(i) + "/tire_pressure/1"s;
double x;
ASSERT_SUCCESS(cars.at_pointer(json_pointer).get(x));
ASSERT_EQUAL(x,expected[i]);
}
TEST_SUCCEED();
}
bool json_path_multiple() {
TEST_START();
ondemand::parser parser;
ondemand::document cars;
size_t size;
ASSERT_SUCCESS(parser.iterate(cars_json).get(cars));
ASSERT_SUCCESS(cars.count_elements().get(size));
double expected[] = {39.9, 31, 30};
for (size_t i = 0; i < size; i++) {
std::string json_path = "["s + std::to_string(i) + "].tire_pressure[1]"s;
double x;
ASSERT_SUCCESS(cars.at_path(json_path).get(x));
ASSERT_EQUAL(x,expected[i]);
}
TEST_SUCCEED();
}
bool json_pointer_rewind() {
TEST_START();
auto json = R"( {
"k0": 27,
"k1": [13,26],
"k2": true
} )"_padded;
ondemand::parser parser;
ondemand::document doc;
uint64_t i;
bool b;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
ASSERT_SUCCESS(doc.at_pointer("/k1/1").get(i));
ASSERT_EQUAL(i,26);
ASSERT_SUCCESS(doc.at_pointer("/k2").get(b));
ASSERT_EQUAL(b,true);
doc.rewind(); // Need to manually rewind to be able to use find_field properly from start of document
ASSERT_SUCCESS(doc.find_field("k0").get(i));
ASSERT_EQUAL(i,27);
TEST_SUCCEED();
}
bool iterate_many_example() {
TEST_START();
auto json = R"([1,2,3] {"1":1,"2":3,"4":4} [1,2,3] )"_padded;
simdjson::ondemand::parser parser;
simdjson::ondemand::document_stream stream;
ASSERT_SUCCESS(parser.iterate_many(json).get(stream));
auto i = stream.begin();
size_t count{0};
size_t expected_indexes[3] = {0,9,29};
std::string_view expected_doc[3] = {"[1,2,3]", R"({"1":1,"2":3,"4":4})", "[1,2,3]"};
for(; i != stream.end(); ++i) {
auto doc = *i;
ASSERT_SUCCESS(doc.type());
ASSERT_SUCCESS(i.error());
ASSERT_EQUAL(i.current_index(),expected_indexes[count]);
ASSERT_EQUAL(i.source(),expected_doc[count]);
count++;
}
TEST_SUCCEED();
}
std::string my_string(ondemand::document& doc) {
std::stringstream ss;
ss << doc;
return ss.str();
}
bool iterate_many_truncated_example() {
TEST_START();
auto json = R"([1,2,3] {"1":1,"2":3,"4":4} {"key":"intentionally unclosed string )"_padded;
simdjson::ondemand::parser parser;
simdjson::ondemand::document_stream stream;
ASSERT_SUCCESS( parser.iterate_many(json,json.size()).get(stream) );
std::string_view expected[2] = {"[1,2,3]", R"({"1":1,"2":3,"4":4})"};
size_t count{0};
for(auto i = stream.begin(); i != stream.end(); ++i) {
ASSERT_EQUAL(i.source(),expected[count++]);
}
size_t truncated = stream.truncated_bytes();
ASSERT_EQUAL(truncated,39);
TEST_SUCCEED();
}
bool ndjson_basics_example() {
TEST_START();
auto json = R"({ "foo": 1 } { "foo": 2 } { "foo": 3 } )"_padded;
ondemand::parser parser;
ondemand::document_stream docs;
ASSERT_SUCCESS( parser.iterate_many(json).get(docs) );
size_t count{0};
int64_t expected[3] = {1,2,3};
for (auto doc : docs) {
int64_t actual{};
ASSERT_SUCCESS( doc["foo"].get(actual) );
ASSERT_EQUAL( actual, expected[count++] );
}
TEST_SUCCEED();
}
bool stream_capacity_example() {
auto json = R"([1,2,3,4,5] [1,2,3,4,5] [1,2,3,4,5] [1,2,3,4,5] [1,2,3,4,5] [1,2,3,4,5] [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])"_padded;
ondemand::parser parser;
ondemand::document_stream stream;
size_t counter{0};
auto error = parser.iterate_many(json, 50).get(stream);
if( error ) { /* handle the error */ }
for (auto doc: stream) {
if(counter < 6) {
int64_t val{};
error = doc.at_pointer("/4").get(val);
if( error ) { /* handle the error */ }
std::cout << "5 = " << val << std::endl;
} else {
ondemand::value val;
error = doc.at_pointer("/4").get(val);
// error == simdjson::CAPACITY
if(error) {
std::cerr << error << std::endl;
// We left 293 bytes unprocessed at the tail end of the input.
std::cout << " unprocessed bytes at the end: " << stream.truncated_bytes() << std::endl;
break;
}
}
counter++;
}
return true;
}
bool simple_error_example() {
ondemand::parser parser;
auto json = R"({"bad number":3.14.1 })"_padded;
ondemand::document doc;
if( parser.iterate(json).get(doc) != SUCCESS ) { return false; }
double x;
auto error = doc["bad number"].get_double().get(x);
// returns "simdjson::NUMBER_ERROR"
if(error != SUCCESS) {
std::cout << error << std::endl;
return false;
}
std::cout << "Got " << x << std::endl;
return true;
}
#if SIMDJSON_EXCEPTIONS
#include "simdjson.h"
#include <iostream>
void scan_json_object_keys() {
auto json = R"({"price": 123.456789, "volume": 9999,
"timestamp": "2025-09-04T09:45:00Z",
"symbol": "XYZ", "currency": "USD", "change": 1.23,
"isActive": true})"_padded;
simdjson::ondemand::parser parser;
simdjson::ondemand::document doc = parser.iterate(json);
for(auto keyvalue : doc.get_object()) {
simdjson::ondemand::raw_json_string key = keyvalue.key();
switch(key[0]) {
case 'p': // price
if (key == "price") {
std::string_view price_str = keyvalue.value().raw_json();
std::cout << "Price: " << price_str << std::endl;
}
break;
case 'v': // volume
if (key == "volume") {
std::string_view volume_str = keyvalue.value().raw_json();
std::cout << "Volume: " << volume_str << std::endl;
}
break;
case 't': // timestamp
if (key == "timestamp") {
std::string_view timestamp = keyvalue.value();
std::cout << "Timestamp: " << timestamp << std::endl;
}
break;
default: break;
}
}
}
// prints the content of the array as hexadecimal 64-bit integers
void f(simdjson::ondemand::array v) {
for(uint64_t val : v) {
std::cout << "0x" << std::hex << val << std::endl;
}
}
int callf(void) {
simdjson::padded_string json = R"( [ 897314173811950000, 3122321 ])"_padded;
simdjson::ondemand::parser parser;
simdjson::ondemand::document doc = parser.iterate(json);
f(doc.get_array());
return EXIT_SUCCESS;
}
bool key_raw_json_token() {
TEST_START();
auto json = R"( {"name" : "Jack The Ripper \u0033"} )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
for (auto key_value : doc.get_object()) {
std::string_view keysv = key_value.key_raw_json_token();
ASSERT_EQUAL(keysv,"\"name\" ");
}
TEST_SUCCEED();
}
bool raw_string() {
TEST_START();
auto json = R"( {"name": "Jack The Ripper \u0033"} )"_padded;
// We create a buffer large enough to store all strings we need:
std::unique_ptr<uint8_t[]> buffer(new uint8_t[json.size() + simdjson::SIMDJSON_PADDING]);
uint8_t * ptr = buffer.get();
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
// We store our strings as 'string_view' instances in a vector:
std::vector<std::string_view> mystrings;
for (auto key_value : doc.get_object()) {
std::string_view keysv = parser.unescape(key_value.key(), ptr);// writes 'name'
mystrings.push_back(keysv);
std::string_view valuesv = parser.unescape(key_value.value().get_raw_json_string(), ptr);
// writes 'Jack The Ripper 3', escaping the \u0033
mystrings.push_back(valuesv);
}
ASSERT_EQUAL(mystrings[0],"name");
ASSERT_EQUAL(mystrings[1],"Jack The Ripper 3");
TEST_SUCCEED();
}
bool simple_error_example_except() {
TEST_START();
ondemand::parser parser;
auto json = R"({"bad number":3.14.1 })"_padded;
try {
ondemand::document doc = parser.iterate(json);
double x = doc["bad number"].get_double();
std::cout << "Got " << x << std::endl;
TEST_SUCCEED();
} catch(simdjson_error& e) {
// e.error() == NUMBER_ERROR
std::cout << e.error() << std::endl;
TEST_FAIL("I did not expect an exception");
}
}
int64_t current_location_tape_error_with_except() {
TEST_START();
auto broken_json = R"( {"double": 13.06, false, "integer": -343} )"_padded;
ondemand::parser parser;
ondemand::document doc;
try {
doc = parser.iterate(broken_json);
return int64_t(doc["integer"]);
} catch(simdjson_error& err) {
std::cout << err.error() << std::endl;
std::cout << doc.current_location() << std::endl;
TEST_SUCCEED();
}
TEST_FAIL("I expected an exception!");
}
#endif
int load_example() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::ondemand::document tweets;
padded_string json;
auto error = padded_string::load("twitter.json").get(json);
if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
error = parser.iterate(json).get(tweets);
if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
uint64_t identifier;
error = tweets["statuses"].at(0)["id"].get(identifier);
if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
std::cout << identifier << std::endl;
return EXIT_SUCCESS;
}
int example_1() {
TEST_START();
simdjson::ondemand::parser parser;
//auto error = padded_string::load("twitter.json").get(json);
// if(error) { std::cerr << error << std::endl; return EXIT_FAILURE; }
padded_string json = R"( {
"statuses": [
{
"id": 505874924095815700
},
{
"id": 505874922023837700
}
],
"search_metadata": {
"count": 100
}
} )"_padded;
simdjson::ondemand::document tweets;
auto error = parser.iterate(json).get(tweets);
if( error ) { return EXIT_FAILURE; }
simdjson::ondemand::value res;
error = tweets["search_metadata"]["count"].get(res);
if (error != SUCCESS) {
std::cerr << "could not access keys" << std::endl;
return EXIT_FAILURE;
}
std::cout << res << " results." << std::endl;
return true;
}
#if SIMDJSON_EXCEPTIONS
int load_example_except() {
TEST_START();
simdjson::ondemand::parser parser;
padded_string json = padded_string::load("twitter.json");
simdjson::ondemand::document tweets = parser.iterate(json);
uint64_t identifier = tweets["statuses"].at(0)["id"];
std::cout << identifier << std::endl;
return EXIT_SUCCESS;
}
int load_example_except_morecomplete(void) {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::padded_string json_string;
simdjson::ondemand::document doc;
try {
json_string = padded_string::load("twitter.json");
doc = parser.iterate(json_string);
uint64_t identifier = doc["statuses"].at(0)["id"];
std::cout << identifier << std::endl;
} catch (simdjson::simdjson_error &error) {
std::cerr << "JSON error: " << error.what() << " near "
<< doc.current_location() << " in " << json_string << std::endl;
}
return EXIT_SUCCESS;
}
bool allow_comma_separated_example() {
TEST_START();
auto json = R"( 1, 2, 3, 4, "a", "b", "c", {"hello": "world"} , [1, 2, 3])"_padded;
ondemand::parser parser;
ondemand::document_stream doc_stream;
// We pass '32' as the batch size, but it is a bogus parameter because, since
// we pass 'true' to the allow_comma parameter, the batch size will be set to at least
// the document size.
auto error = parser.iterate_many(json, 32, true).get(doc_stream);
if(error) { std::cerr << error << std::endl; return false; }
for (auto doc : doc_stream) {
std::cout << doc.type() << std::endl;
}
TEST_SUCCEED();
}
bool issue2215() {
TEST_START();
ondemand::parser parser;
const padded_string json = R"({ "parent": {"child1": {"name": "John"} , "child2": {"name": "Daniel"}} })"_padded;
auto doc = parser.iterate(json);
ondemand::object parent = doc["parent"];
// parent owns the focus
ondemand::object c1 = parent["child1"];
// c1 owns the focus
//
std::string_view as1 = c1["name"];
// We have that as1 == "John", as long as 'parser' and 'json' live
// c2 attempts to grab the focus from parent but fails
ondemand::object c2 = parent["child2"];
// c2 owns the focus, at this point c1 is invalid
std::string_view as2 = c2["name"];
// We have that as2 == "Daniel", as long as 'parser' and 'json' live
ASSERT_EQUAL(as1, "John");
ASSERT_EQUAL(as2, "Daniel");
std::cout << as1 << " " << as2 << std::endl;
TEST_SUCCEED();
}
#endif
bool test_load_example() {
TEST_START();
simdjson::ondemand::parser parser;
simdjson::ondemand::document tweets;
padded_string json = R"( {"statuses":[{"id":1234}]} )"_padded;
auto error = parser.iterate(json).get(tweets);
if(error) { std::cerr << error << std::endl; return false; }
uint64_t identifier;
error = tweets["statuses"].at(0)["id"].get(identifier);
if(error) { std::cerr << error << std::endl; return false; }
std::cout << identifier << std::endl;
return identifier == 1234;
}
bool current_location_tape_error() {
TEST_START();
auto broken_json = R"( {"double": 13.06, false, "integer": -343} )"_padded;
ondemand::parser parser;
ondemand::document doc;
ASSERT_SUCCESS(parser.iterate(broken_json).get(doc));
const char * ptr;
int64_t i;
ASSERT_ERROR(doc["integer"].get_int64().get(i), TAPE_ERROR);
ASSERT_SUCCESS(doc.current_location().get(ptr));
std::string expected = "false, \"integer\": -343} ";
ASSERT_EQUAL(std::string(ptr,expected.size()), expected);
TEST_SUCCEED();
}
bool current_location_user_error() {
TEST_START();
auto json = R"( [1,2,3] )"_padded;
ondemand::parser parser;
ondemand::document doc;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
const char * ptr;
int64_t i;
ASSERT_ERROR(doc["integer"].get_int64().get(i), INCORRECT_TYPE);
ASSERT_SUCCESS(doc.current_location().get(ptr));
std::string expected = "[1,2,3] ";
ASSERT_EQUAL(std::string(ptr, expected.size()), expected);
TEST_SUCCEED();
}
bool current_location_out_of_bounds() {
TEST_START();
auto json = R"( [1,2,3] )"_padded;
ondemand::parser parser;
ondemand::document doc;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
uint64_t expected[3] = {1, 2, 3};
size_t count{0};
for (auto val : doc) {
uint64_t i;
ASSERT_SUCCESS(val.get_uint64().get(i));
ASSERT_EQUAL(i, expected[count++]);
}
ASSERT_EQUAL(count, 3);
ASSERT_ERROR(doc.current_location(), OUT_OF_BOUNDS);
TEST_SUCCEED();
}
bool current_location_no_error() {
TEST_START();
auto json = R"( [[1,2,3], -23.4, {"key": "value"}, true] )"_padded;
ondemand::parser parser;
ondemand::document doc;
ASSERT_SUCCESS(parser.iterate(json).get(doc));
const char * ptr;
for (auto val : doc) {
ondemand::object obj;
auto error = val.get_object().get(obj);
if (!error) {
ASSERT_SUCCESS(doc.current_location().get(ptr));
std::string expected = "\"key\": \"value\"}, true] ";
ASSERT_EQUAL(std::string(ptr, expected.size()), expected);
}
}
TEST_SUCCEED();
}
struct ZuluBBox {
double xmin;
double ymin;
double width;
double height;
void print() {
std::cout << xmin << ", " << ymin << ", " << width << ", " << height
<< std::endl;
}
};
#if SIMDJSON_EXCEPTIONS
bool example1956() {
auto json = R"+( {
"ZuluROI": {
"ZuluBBox": {
"xmin": 0,
"ymin": 0,
"width": 1,
"height": 1
},
"SubObjects": [
{
"ZuluDetection": {
"label": "car",
"class_id": 3,
"confidence": 0.7587034106254578,
"ZuluBBox": {
"xmin": 0.3843536376953125,
"ymin": 0.4532909393310547,
"width": 0.09115534275770187,
"height": 0.04127710685133934
},
"SubObjects": []
}
},
{
"ZuluDetection": {
"label": "car",
"class_id": 3,
"confidence": 0.6718865633010864,
"ZuluBBox": {
"xmin": 0.7500002980232239,
"ymin": 0.5212296843528748,
"width": 0.07592231780290604,
"height": 0.038947589695453644
},
"SubObjects": []
}
},
{
"ZuluDetection": {
"label": "car",
"class_id": 3,
"confidence": 0.5806200504302979,
"ZuluBBox": {
"xmin": 0.9025363922119141,
"ymin": 0.5925348401069641,
"width": 0.05478987470269203,
"height": 0.046337299048900604
},
"SubObjects": []
}
}
]
},
"timestamp (ms)": 1677085594421,
"buffer_offset": 35673
} )+"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
ondemand::object root_object = doc.get_object();
ondemand::object roi_object = root_object["ZuluROI"];
ondemand::object box_roi_object = roi_object["ZuluBBox"];
ZuluBBox box = {
double(box_roi_object["xmin"]), double(box_roi_object["ymin"]),
double(box_roi_object["width"]), double(box_roi_object["height"])};
box.print();
for (ondemand::object value : roi_object["SubObjects"]) {
ondemand::object detect = value["ZuluDetection"];
std::cout << detect["label"].get_string() << std::endl;
std::cout << detect["class_id"].get_uint64() << std::endl;
std::cout << detect["confidence"].get_double() << std::endl;
ondemand::object vbox_roi_object = detect["ZuluBBox"];
ZuluBBox vbox = {
double(vbox_roi_object["xmin"]), double(vbox_roi_object["ymin"]),
double(vbox_roi_object["width"]), double(vbox_roi_object["height"])};
vbox.print();
}
std::cout << root_object["timestamp (ms)"].get_uint64() << std::endl;
std::cout << root_object["buffer_offset"].get_uint64() << std::endl;
return true;
}
bool example1958() {
auto json = R"+( {
"5f08a730b280e54fd1e75a7046b93fdc": {
"file": "/DEMOS/0-9/10_Orbyte.sid",
"len": [
"1:17"
],
"loud": [
"-22.8"
],
"name": "10 Orbyte",
"author": "Michael Becker (Premium)",
"release": "2014 Tristar & Red Sector Inc.",
"bits": 20
},
"2727236ead44a62f0c6e01f6dd4dc484": {
"file": "/DEMOS/0-9/12345.sid",
"len": [
"0:56"
],
"loud": [
"-33.3"
],
"name": "12345",
"author": "Beal",
"release": "1988 Beal",
"bits": 20
},
"7ea765fce6c0f92570b18adc7bf52f54": {
"file": "/DEMOS/0-9/128_Byte_Blues_BASIC.sid",
"len": [
"0:18"
],
"loud": [
"-27.1"
],
"name": "128 Byte Blues",
"author": "Leonard J. Paul (Freaky DNA)",
"release": "2005 Freaky DNA",
"bits": 62
}
} )+"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
ondemand::object root_object = doc.get_object();
for(auto key_value : root_object) {
// could get std::string_view with 'unescaped_key()':
std::cout << "key: " << key_value.key() << std::endl;
ondemand::object obj = key_value.value();
std::cout << "file: " << std::string_view(obj["file"]) << std::endl;
std::cout << "len: ";
for(std::string_view values : obj["len"]) {
std::cout << values << std::endl;
}
std::cout << std::endl;
std::cout << "loud: ";
for(std::string_view values : obj["loud"]) {
std::cout << values << std::endl;
}
std::cout << std::endl;
std::cout << "name: " << std::string_view(obj["name"]) << std::endl;
std::cout << "author: " << std::string_view(obj["author"]) << std::endl;
std::cout << "release: " << std::string_view(obj["release"]) << std::endl;
std::cout << "bits: " << uint64_t(obj["bits"]) << std::endl;
}
return true;
}
bool to_optional() {
TEST_START();
auto json = R"({ "foo1": "3.1416" } )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
#if __cpp_lib_optional >= 201606L
std::optional<std::string> value;
ASSERT_SUCCESS(doc["foo1"].get_string(value));
std::cout << value.value() << std::endl;
#else
std::string value;
ASSERT_SUCCESS(doc["foo1"].get_string(value));
std::cout << value << std::endl;
#endif
TEST_SUCCEED();
}
bool value_raw_json_array() {
TEST_START();
auto json = R"( [1,2,"fds", {"a":1}, [1,344]] )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
std::string_view expected[] = {"1", "2", "\"fds\"", "{\"a\":1}", "[1,344]"};
size_t counter = 0;
for(auto array: doc) {
std::string_view raw = array.raw_json();
ASSERT_EQUAL(raw, expected[counter++]);
}
TEST_SUCCEED();
}
bool value_raw_json_object() {
TEST_START();
auto json = R"( {"key1":1,"key2":2,"key3":"fds", "key4":{"a":1}, "key5":[1,344]} )"_padded;
ondemand::parser parser;
ondemand::document doc = parser.iterate(json);
std::string_view expected[] = {"1", "2", "\"fds\"", "{\"a\":1}", "[1,344]"};
size_t counter = 0;
for(auto key_value: doc.get_object()) {
std::string_view raw = key_value.value().raw_json();
ASSERT_EQUAL(raw, expected[counter++]);
}
TEST_SUCCEED();
}
#endif
bool run() {
return true
&& fatal_error()
#if SIMDJSON_EXCEPTIONS
#if SIMDJSON_CPLUSPLUS17
&& big_int_array()
#endif // SIMDJSON_CPLUSPLUS17
&& jsondollar()
&& big_int_array_as_double()
&& key_raw_json_token()
&& to_optional()
&& value_raw_json_array() && value_raw_json_object()
&& gen_raw1() && gen_raw2() && gen_raw3()
&& at_end()
&& example1956() && example1958()
&& allow_comma_separated_example()
// && basics_1() // Fails because twitter.json is not in current directory. Compile test only.
&& basics_treewalk()
&& basics_treewalk_breakline()
&& json_value_with_array_count()
&& json_array_with_array_count()
&& json_array_count_complex()
&& json_array_count()
&& json_object_count()
&& using_the_parsed_json_rewind()
&& using_the_parsed_json_rewind_array()
&& basics_2()
&& using_the_parsed_json_1()
&& using_the_parsed_json_2()
&& big_integer()
&& big_integer_in_string()
&& using_the_parsed_json_3()
&& using_the_parsed_json_3b()
&& using_the_parsed_json_4()
&& using_the_parsed_json_5()
#endif
&& simplepad()
&& using_the_parsed_json_6()
&& json_pointer_simple()
&& json_pointer_unicode()
&& json_path_simple()
&& json_path_unicode()
&& invalid_json_path()
&& json_pointer_multiple()
&& json_path_multiple()
&& json_pointer_rewind()
&& iterate_many_example()
&& iterate_many_truncated_example()
&& ndjson_basics_example()
&& stream_capacity_example()
&& test_load_example()
&& example_1()
&& using_the_parsed_json_no_exceptions()
&& current_location_tape_error()
&& current_location_user_error()
&& current_location_out_of_bounds()
&& current_location_no_error()
&& to_string_example_no_except()
#if SIMDJSON_EXCEPTIONS
&& issue2215()
&& to_string_example()
&& raw_string()
&& number_tests()
&& current_location_tape_error_with_except()
&& examplecrt()
&& examplecrt_realloc()
&& at_end_array()
#endif
;
}
int main(int argc, char *argv[]) {
return test_main(argc, argv, run);
}
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