Lab8/json_test.cpp - master - Oppq/Labs

Lab8/json_test.cpp
373 строки12 KB
Oppq
Lab8
21 май 2026, 07:41
21 май 2026, 07:412cd3883
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include "json.hpp"
#include "json_menu.h"

using namespace std;
using json = nlohmann::json;

void test_create()
{
    int choice;
    do
    {
        showCreateMenu();
        cin >> choice;
        
        switch(choice)
        {
            case 1:
            {
                json j;
                cout << "Пустой JSON: " << j << endl;
                break;
            }
            case 2:
            {
                json j = {{"name", "Alice"}, {"age", 25}, {"city", "Moscow"}};
                cout << "Объект: " << j.dump(2) << endl;
                break;
            }
            case 3:
            {
                json j = {10, 20, 30, 40, 50};
                cout << "Массив: " << j.dump() << endl;
                break;
            }
            case 4:
            {
                json j = {{"user", {{"name", "Bob"}, {"age", 30}}}, {"scores", {100, 90, 80}}};
                cout << "Вложенный объект:\n" << j.dump(2) << endl;
                break;
            }
            case 5:
            {
                json j;
                j["null_val"] = nullptr;
                j["bool_val"] = true;
                j["int_val"] = 42;
                j["float_val"] = 3.14;
                j["string_val"] = "hello";
                j["array_val"] = {1, 2, 3};
                j["object_val"] = {{"key", "value"}};
                cout << "Разные типы:\n" << j.dump(2) << endl;
                break;
            }
            case 0: break;
            default: cout << "Неверный выбор" << endl;
        }
    } while(choice != 0);
}

void test_access()
{
    json j = {{"name", "Bob"}, {"age", 30}, {"scores", {95, 87, 92}}, {"address", {{"city", "SPb"}, {"street", "Nevsky"}}}};
    
    cout << "Исходный объект:\n" << j.dump(2) << endl;
    
    int choice;
    do
    {
        showAccessMenu();
        cin >> choice;
        
        switch(choice)
        {
            case 1:
            {
                cout << "j[\"name\"] = " << j["name"] << endl;
                cout << "j[\"scores\"][0] = " << j["scores"][0] << endl;
                break;
            }
            case 2:
            {
                try {
                    cout << "j.at(\"name\") = " << j.at("name") << endl;
                    cout << "j.at(\"bad\") = " << j.at("bad") << endl;
                } catch (json::out_of_range& e) {
                    cout << "Ошибка: ключ не найден" << endl;
                }
                break;
            }
            case 3:
            {
                string name = j.value("name", "no name");
                string phone = j.value("phone", "no phone");
                int age = j.value("age", 0);
                cout << "name = " << name << endl;
                cout << "phone = " << phone << endl;
                cout << "age = " << age << endl;
                break;
            }
            case 4:
            {
                cout << "Есть 'name': " << j.contains("name") << endl;
                cout << "Есть 'phone': " << j.contains("phone") << endl;
                break;
            }
            case 5:
            {
                cout << "Размер объекта: " << j.size() << endl;
                cout << "Размер scores: " << j["scores"].size() << endl;
                break;
            }
            case 6:
            {
                json empty;
                cout << "Объект пуст? " << j.empty() << endl;
                cout << "Пустой JSON пуст? " << empty.empty() << endl;
                break;
            }
            case 7:
            {
                cout << "Все ключи:\n";
                for (auto& item : j.items()) {
                    cout << "  " << item.key() << " = " << item.value() << endl;
                }
                break;
            }
            case 0: break;
            default: cout << "Неверный выбор" << endl;
        }
    } while(choice != 0);
}

void test_modify()
{
    int choice;
    do
    {
        showModifyMenu();
        cin >> choice;
        
        switch(choice)
        {
            case 1:
            {
                json j;
                j["name"] = "Alice";
                j["age"] = 25;
                j["city"] = "Moscow";
                cout << "Результат: " << j.dump(2) << endl;
                break;
            }
            case 2:
            {
                json j = {1, 2, 3};
                j.push_back(4);
                j.push_back(5);
                j.push_back(6);
                cout << "После push_back: " << j.dump() << endl;
                break;
            }
            case 3:
            {
                json j = {{"a", 1}, {"b", 2}};
                j.emplace("c", 3);
                j.emplace("d", 4);
                cout << "После добавления: " << j.dump() << endl;
                break;
            }
            case 4:
            {
                json j = {{"a", 1}, {"b", 2}, {"c", 3}, {"d", 4}};
                j.erase("b");
                j.erase("c");
                cout << "После erase: " << j.dump() << endl;
                break;
            }
            case 5:
            {
                json j = {{"a", 1}, {"b", 2}, {"c", 3}};
                cout << "До clear, размер: " << j.size() << endl;
                j.clear();
                cout << "После clear, размер: " << j.size() << endl;
                break;
            }
            case 6:
            {
                json j = {{"name", "Test"}, {"value", 123}, {"active", true}};
                cout << "dump() без форматирования: " << j.dump() << endl;
                cout << "dump(4) с форматированием:\n" << j.dump(4) << endl;
                break;
            }
            case 7:
            {
                json j = 123;
                int val = j.get<int>();
                cout << "JSON 123 -> int: " << val << endl;
                break;
            }
            case 8:
            {
                json j = "Hello World";
                string val = j.get<string>();
                cout << "JSON Hello World -> string: " << val << endl;
                break;
            }
            case 0: break;
            default: cout << "Неверный выбор" << endl;
        }
    } while(choice != 0);
}

void test_file()
{
    int choice;
    do
    {
        showFileMenu();
        cin >> choice;
        
        switch(choice)
        {
            case 1:
            {
                json j = {{"name", "MyData"}, {"value", 12345}, {"date", "2025-05-21"}, {"tags", {"json", "cpp", "test"}}};
                ofstream file("output.json");
                file << j.dump(4);
                file.close();
                cout << "Сохранено в output.json" << endl;
                break;
            }
            case 2:
            {
                ifstream file("output.json");
                if (file.is_open()) {
                    json j;
                    file >> j;
                    cout << "Прочитано из файла:\n" << j.dump(2) << endl;
                } else {
                    cout << "Файл output.json не найден" << endl;
                }
                break;
            }
            case 3:
            {
                string json_str = R"({"name":"John","age":30,"city":"New York"})";
                json j = json::parse(json_str);
                cout << "Результат парсинга:\n" << j.dump(2) << endl;
                
                string bad_json = "{bad json}";
                try {
                    json j2 = json::parse(bad_json);
                } catch (json::parse_error& e) {
                    cout << "Ошибка парсинга: некорректный JSON" << endl;
                }
                break;
            }
            case 0: break;
            default: cout << "Неверный выбор" << endl;
        }
    } while(choice != 0);
}

void test_types()
{
    cout << "\n========== ПРОВЕРКА ТИПОВ ==========\n";
    
    json j_null = nullptr;
    json j_bool = true;
    json j_number = 123;
    json j_float = 3.14;
    json j_string = "hello";
    json j_array = {1, 2, 3, 4, 5};
    json j_object = {{"key1", "value1"}, {"key2", 42}};
    
    cout << "null.is_null(): " << j_null.is_null() << endl;
    cout << "123.is_number(): " << j_number.is_number() << endl;
    cout << "123.is_number_integer(): " << j_number.is_number_integer() << endl;
    cout << "3.14.is_number_float(): " << j_float.is_number_float() << endl;
    cout << "hello.is_string(): " << j_string.is_string() << endl;
    cout << "[1,2,3,4,5].is_array(): " << j_array.is_array() << endl;
    cout << "объект.is_object(): " << j_object.is_object() << endl;
    cout << "true.is_boolean(): " << j_bool.is_boolean() << endl;
}

void test_comparison()
{
    cout << "\n========== ОПЕРАТОРЫ СРАВНЕНИЯ ==========\n";
    
    json j1 = {{"a", 1}, {"b", 2}, {"c", 3}};
    json j2 = {{"a", 1}, {"b", 2}, {"c", 3}};
    json j3 = {{"a", 1}, {"b", 2}, {"c", 4}};
    
    cout << "j1 == j2: " << (j1 == j2) << endl;
    cout << "j1 == j3: " << (j1 == j3) << endl;
    cout << "j1 != j3: " << (j1 != j3) << endl;
    
    json num1 = 10;
    json num2 = 20;
    cout << "10 < 20: " << (num1 < num2) << endl;
    
    json arr1 = {1, 2, 3};
    json arr2 = {1, 2, 4};
    cout << "[1,2,3] < [1,2,4]: " << (arr1 < arr2) << endl;
}

void test_json_pointer()
{
    cout << "\nJSON POINTER\n";
    
    json j;
    j["store"]["book"]["title"] = "C++";
    j["store"]["book"]["price"] = 49.99;
    j["user"]["name"] = "Alice";
    
    cout << "Исходный JSON:\n" << j.dump(2) << endl;
    
    string title = j["/store/book/title"_json_pointer];
    double price = j["/store/book/price"_json_pointer];
    string name = j["/user/name"_json_pointer];
    
    cout << "/store/book/title -> " << title << endl;
    cout << "/store/book/price -> " << price << endl;
    cout << "/user/name -> " << name << endl;
    
    j["/store/book/price"_json_pointer] = 39.99;
    j["/user/last_login"_json_pointer] = "2025-05-21";
    
    cout << "После изменения:\n" << j.dump(2) << endl;
}

int main()
{
    int choice;
    do
    {
        showMainMenu();
        cin >> choice;
        
        switch(choice)
        {
            case 1: test_create(); break;
            case 2: test_access(); break;
            case 3: test_modify(); break;
            case 4: test_file(); break;
            case 5:
            {
                int advChoice;
                do
                {
                    showAdvancedMenu();
                    cin >> advChoice;
                    switch(advChoice)
                    {
                        case 1: test_types(); break;
                        case 2: test_comparison(); break;
                        case 3: test_json_pointer(); break;
                        case 0: break;
                        default: cout << "Неверный выбор" << endl;
                    }
                } while(advChoice != 0);
                break;
            }
            case 0: cout << "До свидания!" << endl; break;
            default: cout << "Неверный выбор" << endl;
        }
    } while(choice != 0);
    
    return 0;
}