| /* |
| __ _____ _____ _____ |
| __| | __| | | | JSON for Modern C++ (test suite) |
| | | |__ | | | | | | version 3.9.0 |
| |_____|_____|_____|_|___| https://github.com/nlohmann/json |
| |
| Licensed under the MIT License <http://opensource.org/licenses/MIT>. |
| SPDX-License-Identifier: MIT |
| Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), to deal |
| in the Software without restriction, including without limitation the rights |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| copies of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included in all |
| copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| SOFTWARE. |
| */ |
| |
| #include "doctest_compatibility.h" |
| DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal") |
| |
| #include <nlohmann/json.hpp> |
| using nlohmann::json; |
| |
| #include <deque> |
| #include <forward_list> |
| #include <list> |
| #include <set> |
| #include <unordered_map> |
| #include <unordered_set> |
| #include <iostream> |
| #include <sstream> |
| #include <iomanip> |
| |
| #if defined(_MSC_VER) |
| #pragma warning (push) |
| #pragma warning (disable : 4189) // local variable is initialized but not referenced |
| #endif |
| |
| TEST_CASE("README" * doctest::skip()) |
| { |
| { |
| // redirect std::cout for the README file |
| auto old_cout_buffer = std::cout.rdbuf(); |
| std::ostringstream new_stream; |
| std::cout.rdbuf(new_stream.rdbuf()); |
| { |
| // create an empty structure (null) |
| json j; |
| |
| // add a number that is stored as double (note the implicit conversion of j to an object) |
| j["pi"] = 3.141; |
| |
| // add a Boolean that is stored as bool |
| j["happy"] = true; |
| |
| // add a string that is stored as std::string |
| j["name"] = "Niels"; |
| |
| // add another null object by passing nullptr |
| j["nothing"] = nullptr; |
| |
| // add an object inside the object |
| j["answer"]["everything"] = 42; |
| |
| // add an array that is stored as std::vector (using an initializer list) |
| j["list"] = { 1, 0, 2 }; |
| |
| // add another object (using an initializer list of pairs) |
| j["object"] = { {"currency", "USD"}, {"value", 42.99} }; |
| |
| // instead, you could also write (which looks very similar to the JSON above) |
| json j2 = |
| { |
| {"pi", 3.141}, |
| {"happy", true}, |
| {"name", "Niels"}, |
| {"nothing", nullptr}, |
| { |
| "answer", { |
| {"everything", 42} |
| } |
| }, |
| {"list", {1, 0, 2}}, |
| { |
| "object", { |
| {"currency", "USD"}, |
| {"value", 42.99} |
| } |
| } |
| }; |
| } |
| |
| { |
| // ways to express the empty array [] |
| json empty_array_implicit = {{}}; |
| CHECK(empty_array_implicit.is_array()); |
| json empty_array_explicit = json::array(); |
| CHECK(empty_array_explicit.is_array()); |
| |
| // a way to express the empty object {} |
| json empty_object_explicit = json::object(); |
| CHECK(empty_object_explicit.is_object()); |
| |
| // a way to express an _array_ of key/value pairs [["currency", "USD"], ["value", 42.99]] |
| json array_not_object = json::array({ {"currency", "USD"}, {"value", 42.99} }); |
| CHECK(array_not_object.is_array()); |
| CHECK(array_not_object.size() == 2); |
| CHECK(array_not_object[0].is_array()); |
| CHECK(array_not_object[1].is_array()); |
| } |
| |
| { |
| // create object from string literal |
| json j = "{ \"happy\": true, \"pi\": 3.141 }"_json; |
| |
| // or even nicer with a raw string literal |
| auto j2 = R"( |
| { |
| "happy": true, |
| "pi": 3.141 |
| } |
| )"_json; |
| |
| // or explicitly |
| auto j3 = json::parse("{ \"happy\": true, \"pi\": 3.141 }"); |
| |
| // explicit conversion to string |
| std::string s = j.dump(); // {\"happy\":true,\"pi\":3.141} |
| |
| // serialization with pretty printing |
| // pass in the amount of spaces to indent |
| std::cout << j.dump(4) << std::endl; |
| // { |
| // "happy": true, |
| // "pi": 3.141 |
| // } |
| |
| std::cout << std::setw(2) << j << std::endl; |
| } |
| |
| { |
| // create an array using push_back |
| json j; |
| j.push_back("foo"); |
| j.push_back(1); |
| j.push_back(true); |
| |
| // comparison |
| bool x = (j == "[\"foo\", 1, true]"_json); // true |
| CHECK(x == true); |
| |
| // iterate the array |
| for (json::iterator it = j.begin(); it != j.end(); ++it) |
| { |
| std::cout << *it << '\n'; |
| } |
| |
| // range-based for |
| for (auto element : j) |
| { |
| std::cout << element << '\n'; |
| } |
| |
| // getter/setter |
| const auto tmp = j[0].get<std::string>(); |
| j[1] = 42; |
| bool foo{j.at(2)}; |
| CHECK(foo == true); |
| |
| // other stuff |
| j.size(); // 3 entries |
| j.empty(); // false |
| j.type(); // json::value_t::array |
| j.clear(); // the array is empty again |
| |
| // create an object |
| json o; |
| o["foo"] = 23; |
| o["bar"] = false; |
| o["baz"] = 3.141; |
| |
| // find an entry |
| if (o.find("foo") != o.end()) |
| { |
| // there is an entry with key "foo" |
| } |
| } |
| |
| { |
| std::vector<int> c_vector {1, 2, 3, 4}; |
| json j_vec(c_vector); |
| // [1, 2, 3, 4] |
| |
| std::deque<float> c_deque {1.2f, 2.3f, 3.4f, 5.6f}; |
| json j_deque(c_deque); |
| // [1.2, 2.3, 3.4, 5.6] |
| |
| std::list<bool> c_list {true, true, false, true}; |
| json j_list(c_list); |
| // [true, true, false, true] |
| |
| std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543}; |
| json j_flist(c_flist); |
| // [12345678909876, 23456789098765, 34567890987654, 45678909876543] |
| |
| std::array<unsigned long, 4> c_array {{1, 2, 3, 4}}; |
| json j_array(c_array); |
| // [1, 2, 3, 4] |
| |
| std::set<std::string> c_set {"one", "two", "three", "four", "one"}; |
| json j_set(c_set); // only one entry for "one" is used |
| // ["four", "one", "three", "two"] |
| |
| std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"}; |
| json j_uset(c_uset); // only one entry for "one" is used |
| // maybe ["two", "three", "four", "one"] |
| |
| std::multiset<std::string> c_mset {"one", "two", "one", "four"}; |
| json j_mset(c_mset); // both entries for "one" are used |
| // maybe ["one", "two", "one", "four"] |
| |
| std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"}; |
| json j_umset(c_umset); // both entries for "one" are used |
| // maybe ["one", "two", "one", "four"] |
| } |
| |
| { |
| std::map<std::string, int> c_map { {"one", 1}, {"two", 2}, {"three", 3} }; |
| json j_map(c_map); |
| // {"one": 1, "two": 2, "three": 3} |
| |
| std::unordered_map<const char*, float> c_umap { {"one", 1.2f}, {"two", 2.3f}, {"three", 3.4f} }; |
| json j_umap(c_umap); |
| // {"one": 1.2, "two": 2.3, "three": 3.4} |
| |
| std::multimap<std::string, bool> c_mmap { {"one", true}, {"two", true}, {"three", false}, {"three", true} }; |
| json j_mmap(c_mmap); // only one entry for key "three" is used |
| // maybe {"one": true, "two": true, "three": true} |
| |
| std::unordered_multimap<std::string, bool> c_ummap { {"one", true}, {"two", true}, {"three", false}, {"three", true} }; |
| json j_ummap(c_ummap); // only one entry for key "three" is used |
| // maybe {"one": true, "two": true, "three": true} |
| } |
| |
| { |
| // strings |
| std::string s1 = "Hello, world!"; |
| json js = s1; |
| auto s2 = js.get<std::string>(); |
| |
| // Booleans |
| bool b1 = true; |
| json jb = b1; |
| bool b2{jb}; |
| CHECK(b2 == true); |
| |
| // numbers |
| int i = 42; |
| json jn = i; |
| double f{jn}; |
| CHECK(f == 42); |
| |
| // etc. |
| |
| std::string vs = js.get<std::string>(); |
| bool vb = jb.get<bool>(); |
| CHECK(vb == true); |
| int vi = jn.get<int>(); |
| CHECK(vi == 42); |
| |
| // etc. |
| } |
| |
| { |
| // a JSON value |
| json j_original = R"({ |
| "baz": ["one", "two", "three"], |
| "foo": "bar" |
| })"_json; |
| |
| // access members with a JSON pointer (RFC 6901) |
| j_original["/baz/1"_json_pointer]; |
| // "two" |
| |
| // a JSON patch (RFC 6902) |
| json j_patch = R"([ |
| { "op": "replace", "path": "/baz", "value": "boo" }, |
| { "op": "add", "path": "/hello", "value": ["world"] }, |
| { "op": "remove", "path": "/foo"} |
| ])"_json; |
| |
| // apply the patch |
| json j_result = j_original.patch(j_patch); |
| // { |
| // "baz": "boo", |
| // "hello": ["world"] |
| // } |
| |
| // calculate a JSON patch from two JSON values |
| auto res = json::diff(j_result, j_original); |
| // [ |
| // { "op":" replace", "path": "/baz", "value": ["one", "two", "three"] }, |
| // { "op":"remove","path":"/hello" }, |
| // { "op":"add","path":"/foo","value":"bar" } |
| // ] |
| } |
| |
| // restore old std::cout |
| std::cout.rdbuf(old_cout_buffer); |
| } |
| } |
| |
| #if defined(_MSC_VER) |
| #pragma warning (pop) |
| #endif |
