101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
#include <string>
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#include <cstdio>
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#include <iostream>
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#include <sstream>
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#include "json11.hpp"
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#include <cassert>
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using namespace json11;
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using std::string;
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// Check that Json has the properties we want.
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#include <type_traits>
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#define CHECK_TRAIT(x) static_assert(std::x::value, #x)
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CHECK_TRAIT(is_nothrow_constructible<Json>);
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CHECK_TRAIT(is_nothrow_default_constructible<Json>);
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CHECK_TRAIT(is_copy_constructible<Json>);
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CHECK_TRAIT(is_nothrow_move_constructible<Json>);
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CHECK_TRAIT(is_copy_assignable<Json>);
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CHECK_TRAIT(is_nothrow_move_assignable<Json>);
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CHECK_TRAIT(is_nothrow_destructible<Json>);
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void parse_from_stdin() {
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string buf;
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while (!std::cin.eof()) buf += std::cin.get();
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string err;
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auto json = Json::parse(buf, err);
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if (!err.empty()) {
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printf("Failed: %s\n", err.c_str());
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} else {
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printf("Result: %s\n", json.dump().c_str());
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}
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}
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int main(int argc, char **argv) {
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if (argc == 2 && argv[1] == string("--stdin")) {
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parse_from_stdin();
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return 0;
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}
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const string simple_test =
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R"({"k1":"v1", "k2":42, "k3":["a",123,true,false,null]})";
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string err;
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auto json = Json::parse(simple_test, err);
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std::cout << "k1: " << json["k1"].string_value() << "\n";
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std::cout << "k3: " << json["k3"].dump() << "\n";
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for (auto &k : json["k3"].array_items()) {
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std::cout << " - " << k.dump() << "\n";
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}
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// Json literals
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Json obj = Json::object({
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{ "k1", "v1" },
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{ "k2", 42.0 },
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{ "k3", Json::array({ "a", 123.0, true, false, nullptr }) },
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});
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std::cout << "obj: " << obj.dump() << "\n";
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assert(Json("a").number_value() == 0);
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assert(Json("a").string_value() == "a");
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assert(Json().number_value() == 0);
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assert(obj == json);
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assert(Json(42) == Json(42.0));
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assert(Json(42) != Json(42.1));
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const string unicode_escape_test =
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R"([ "blah\ud83d\udca9blah\ud83dblah\udca9blah\u0000blah\u1234" ])";
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const char utf8[] = "blah" "\xf0\x9f\x92\xa9" "blah" "\xed\xa0\xbd" "blah"
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"\xed\xb2\xa9" "blah" "\0" "blah" "\xe1\x88\xb4";
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Json uni = Json::parse(unicode_escape_test, err);
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assert(uni[0].string_value().size() == (sizeof utf8) - 1);
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assert(memcmp(uni[0].string_value().data(), utf8, sizeof utf8) == 0);
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Json my_json = Json::object {
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{ "key1", "value1" },
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{ "key2", false },
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{ "key3", Json::array { 1, 2, 3 } },
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};
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std::string json_str = my_json.dump();
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printf("%s\n", json_str.c_str());
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class Point {
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public:
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int x;
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int y;
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Point (int x, int y) : x(x), y(y) {}
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Json to_json() const { return Json::array { x, y }; }
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};
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std::vector<Point> points = { { 1, 2 }, { 10, 20 }, { 100, 200 } };
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std::string points_json = Json(points).dump();
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printf("%s\n", points_json.c_str());
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}
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