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|
// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include <set>
#include <sstream>
#include <string>
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
// Test extending nlohmann::json by using a custom base class.
// Add some metadata to each node and test the behaviour of copy / move
template<class MetaDataType>
class json_metadata
{
public:
using metadata_t = MetaDataType;
metadata_t& metadata()
{
return m_metadata;
}
const metadata_t& metadata() const
{
return m_metadata;
}
private:
metadata_t m_metadata = {};
};
template<class T>
using json_with_metadata =
nlohmann::basic_json <
std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
std::allocator,
nlohmann::adl_serializer,
std::vector<std::uint8_t>,
json_metadata<T>
>;
TEST_CASE("JSON Node Metadata")
{
SECTION("type int")
{
using json = json_with_metadata<int>;
json null;
auto obj = json::object();
auto array = json::array();
null.metadata() = 1;
obj.metadata() = 2;
array.metadata() = 3;
auto copy = array;
CHECK(null.metadata() == 1);
CHECK(obj.metadata() == 2);
CHECK(array.metadata() == 3);
CHECK(copy.metadata() == 3);
}
SECTION("type vector<int>")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
auto copy = value;
value.metadata().emplace_back(2);
CHECK(copy.metadata().size() == 1);
CHECK(copy.metadata().at(0) == 1);
CHECK(value.metadata().size() == 2);
CHECK(value.metadata().at(0) == 1);
CHECK(value.metadata().at(1) == 2);
}
SECTION("copy ctor")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
value.metadata().emplace_back(2);
json copy = value;
CHECK(copy.metadata().size() == 2);
CHECK(copy.metadata().at(0) == 1);
CHECK(copy.metadata().at(1) == 2);
CHECK(value.metadata().size() == 2);
CHECK(value.metadata().at(0) == 1);
CHECK(value.metadata().at(1) == 2);
value.metadata().clear();
CHECK(copy.metadata().size() == 2);
CHECK(value.metadata().size() == 0);
}
SECTION("move ctor")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
value.metadata().emplace_back(2);
const json moved = std::move(value);
CHECK(moved.metadata().size() == 2);
CHECK(moved.metadata().at(0) == 1);
CHECK(moved.metadata().at(1) == 2);
}
SECTION("move assign")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
value.metadata().emplace_back(2);
json moved;
moved = std::move(value);
CHECK(moved.metadata().size() == 2);
CHECK(moved.metadata().at(0) == 1);
CHECK(moved.metadata().at(1) == 2);
}
SECTION("copy assign")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
value.metadata().emplace_back(2);
json copy;
copy = value;
CHECK(copy.metadata().size() == 2);
CHECK(copy.metadata().at(0) == 1);
CHECK(copy.metadata().at(1) == 2);
CHECK(value.metadata().size() == 2);
CHECK(value.metadata().at(0) == 1);
CHECK(value.metadata().at(1) == 2);
value.metadata().clear();
CHECK(copy.metadata().size() == 2);
CHECK(value.metadata().size() == 0);
}
SECTION("type unique_ptr<int>")
{
using json = json_with_metadata<std::unique_ptr<int>>;
json value;
value.metadata().reset(new int(42)); // NOLINT(cppcoreguidelines-owning-memory)
auto moved = std::move(value);
CHECK(moved.metadata() != nullptr);
CHECK(*moved.metadata() == 42);
}
SECTION("type vector<int> in json array")
{
using json = json_with_metadata<std::vector<int>>;
json value;
value.metadata().emplace_back(1);
value.metadata().emplace_back(2);
json const array(10, value);
CHECK(value.metadata().size() == 2);
CHECK(value.metadata().at(0) == 1);
CHECK(value.metadata().at(1) == 2);
for (const auto& val : array)
{
CHECK(val.metadata().size() == 2);
CHECK(val.metadata().at(0) == 1);
CHECK(val.metadata().at(1) == 2);
}
}
}
// Test extending nlohmann::json by using a custom base class.
// Add a custom member function template iterating over the whole json tree.
class visitor_adaptor
{
public:
template <class Fnc>
void visit(const Fnc& fnc) const;
private:
template <class Ptr, class Fnc>
void do_visit(const Ptr& ptr, const Fnc& fnc) const;
};
using json_with_visitor_t = nlohmann::basic_json <
std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
std::allocator,
nlohmann::adl_serializer,
std::vector<std::uint8_t>,
visitor_adaptor
>;
template <class Fnc>
void visitor_adaptor::visit(const Fnc& fnc) const
{
do_visit(json_with_visitor_t::json_pointer{}, fnc);
}
template <class Ptr, class Fnc>
void visitor_adaptor::do_visit(const Ptr& ptr, const Fnc& fnc) const
{
using value_t = nlohmann::detail::value_t;
const json_with_visitor_t& json = *static_cast<const json_with_visitor_t*>(this); // NOLINT(cppcoreguidelines-pro-type-static-cast-downcast)
switch (json.type())
{
case value_t::object:
for (const auto& entry : json.items())
{
entry.value().do_visit(ptr / entry.key(), fnc);
}
break;
case value_t::array:
for (std::size_t i = 0; i < json.size(); ++i)
{
json.at(i).do_visit(ptr / std::to_string(i), fnc);
}
break;
case value_t::discarded:
break;
case value_t::null:
case value_t::string:
case value_t::boolean:
case value_t::number_integer:
case value_t::number_unsigned:
case value_t::number_float:
case value_t::binary:
default:
fnc(ptr, json);
}
}
TEST_CASE("JSON Visit Node")
{
json_with_visitor_t json;
json["null"];
json["int"] = -1;
json["uint"] = 1U;
json["float"] = 1.0;
json["boolean"] = true;
json["string"] = "string";
json["array"].push_back(0);
json["array"].push_back(1);
json["array"].push_back(json);
std::set<std::string> expected
{
"/null - null - null",
"/int - number_integer - -1",
"/uint - number_unsigned - 1",
"/float - number_float - 1.0",
"/boolean - boolean - true",
"/string - string - \"string\"",
"/array/0 - number_integer - 0",
"/array/1 - number_integer - 1",
"/array/2/null - null - null",
"/array/2/int - number_integer - -1",
"/array/2/uint - number_unsigned - 1",
"/array/2/float - number_float - 1.0",
"/array/2/boolean - boolean - true",
"/array/2/string - string - \"string\"",
"/array/2/array/0 - number_integer - 0",
"/array/2/array/1 - number_integer - 1"
};
json.visit(
[&](const json_with_visitor_t::json_pointer & p,
const json_with_visitor_t& j)
{
std::stringstream str;
str << p.to_string() << " - " ;
using value_t = nlohmann::detail::value_t;
switch (j.type())
{
case value_t::object:
str << "object";
break;
case value_t::array:
str << "array";
break;
case value_t::discarded:
str << "discarded";
break;
case value_t::null:
str << "null";
break;
case value_t::string:
str << "string";
break;
case value_t::boolean:
str << "boolean";
break;
case value_t::number_integer:
str << "number_integer";
break;
case value_t::number_unsigned:
str << "number_unsigned";
break;
case value_t::number_float:
str << "number_float";
break;
case value_t::binary:
str << "binary";
break;
default:
str << "error";
break;
}
str << " - " << j.dump();
CHECK(json.at(p) == j);
INFO(str.str());
CHECK(expected.count(str.str()) == 1);
expected.erase(str.str());
}
);
CHECK(expected.empty());
}
|
