simdjson-simdjson/tests/builder/static_reflection_comprehensive_tests.cpp

#include "simdjson.h"
#include "test_builder.h"
#include <string>
#include <string_view>
#include <vector>
#include <set>
#include <map>
#include <optional>
#include <memory>

using namespace simdjson;

namespace builder_tests {

#if SIMDJSON_STATIC_REFLECTION
  // Custom type for testing tag_invoke with extract_into
  struct Price {
    double amount;
    std::string currency;

    // Custom deserializer that applies currency conversion
    friend error_code tag_invoke(deserialize_tag,
                                ondemand::value& val,
                                Price& price) noexcept {
      ondemand::object obj;
      auto error = val.get_object().get(obj);
      if (error) return error;

      // Get the raw amount
      error = obj["amount"].get(price.amount);
      if (error) return error;

      // Get the currency
      std::string_view currency_sv;
      error = obj["currency"].get(currency_sv);
      if (error) return error;
      price.currency = std::string(currency_sv);

      // Custom logic: Convert EUR to USD for consistency
      if (price.currency == "EUR") {
        price.amount = price.amount * 1.1;  // Simplified conversion
        price.currency = "USD";
      }

      return SUCCESS;
    }
  };

  struct Product {
    std::string name;
    Price price;  // Custom deserializable type
    int stock;
  };

  // Another custom type for testing
  struct Dimensions {
    double value;
    std::string unit;

    // Custom deserializer that converts to metric
    friend error_code tag_invoke(deserialize_tag,
                                ondemand::value& val,
                                Dimensions& dim) noexcept {
      ondemand::object obj;
      auto error = val.get_object().get(obj);
      if (error) return error;

      error = obj["value"].get(dim.value);
      if (error) return error;

      std::string_view unit_sv;
      error = obj["unit"].get(unit_sv);
      if (error) return error;
      dim.unit = std::string(unit_sv);

      // Convert inches to cm
      if (dim.unit == "inches") {
        dim.value = dim.value * 2.54;
        dim.unit = "cm";
      }

      return SUCCESS;
    }
  };

  struct Package {
    std::string id;
    Dimensions weight;
    Dimensions length;
  };
#endif

  bool test_primitive_types() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct PrimitiveTypes {
      bool bool_val;
      char char_val;
      int int_val;
      double double_val;
      float float_val;
    };

    PrimitiveTypes test{true, 'X', 42, 3.14159, 2.71f};

    auto result = builder::to_json_string(test);
    ASSERT_SUCCESS(result);

    std::string json = result.value();
    ASSERT_TRUE(json.find("\"bool_val\":true") != std::string::npos);
    ASSERT_TRUE(json.find("\"char_val\":\"X\"") != std::string::npos);
    ASSERT_TRUE(json.find("\"int_val\":42") != std::string::npos);
    ASSERT_TRUE(json.find("\"double_val\":3.14159") != std::string::npos);

    // Test round-trip
    ondemand::parser parser;
    auto doc_result = parser.iterate(pad(json));
    ASSERT_SUCCESS(doc_result);

    auto get_result = doc_result.value().get<PrimitiveTypes>();
    ASSERT_SUCCESS(get_result);

    PrimitiveTypes deserialized = std::move(get_result.value());
    ASSERT_EQUAL(deserialized.bool_val, test.bool_val);
    ASSERT_EQUAL(deserialized.char_val, test.char_val);
    ASSERT_EQUAL(deserialized.int_val, test.int_val);
    ASSERT_EQUAL(deserialized.double_val, test.double_val);
#endif
    TEST_SUCCEED();
  }

  bool test_string_types() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct StringTypes {
      std::string string_val;
      std::string_view string_view_val;
    };

    StringTypes test{"hello world", "test_view"};

    auto result = builder::to_json_string(test);
    ASSERT_SUCCESS(result);

    std::string json = result.value();
    ASSERT_TRUE(json.find("\"string_val\":\"hello world\"") != std::string::npos);
    ASSERT_TRUE(json.find("\"string_view_val\":\"test_view\"") != std::string::npos);

    // Test round-trip
    ondemand::parser parser;
    auto doc_result = parser.iterate(pad(json));
    ASSERT_SUCCESS(doc_result);

    auto get_result = doc_result.value().get<StringTypes>();
    ASSERT_SUCCESS(get_result);

    StringTypes deserialized = std::move(get_result.value());
    ASSERT_EQUAL(deserialized.string_val, test.string_val);
#endif
    TEST_SUCCEED();
  }

  bool test_optional_types() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct OptionalTypes {
      std::optional<int> opt_int_with_value;
      std::optional<std::string> opt_string_with_value;
      std::optional<int> opt_int_null;
      std::optional<std::string> opt_string_null;
    };

    OptionalTypes test;
    test.opt_int_with_value = 42;
    test.opt_string_with_value = "optional_test";
    test.opt_int_null = std::nullopt;
    test.opt_string_null = std::nullopt;

    auto result = builder::to_json_string(test);
    ASSERT_SUCCESS(result);

    std::string json = result.value();
    ASSERT_TRUE(json.find("\"opt_int_with_value\":42") != std::string::npos);
    ASSERT_TRUE(json.find("\"opt_string_with_value\":\"optional_test\"") != std::string::npos);
    ASSERT_TRUE(json.find("\"opt_int_null\":null") != std::string::npos);
    ASSERT_TRUE(json.find("\"opt_string_null\":null") != std::string::npos);

    // Test round-trip
    ondemand::parser parser;
    auto doc_result = parser.iterate(pad(json));
    ASSERT_SUCCESS(doc_result);

    auto get_result = doc_result.value().get<OptionalTypes>();
    ASSERT_SUCCESS(get_result);

    OptionalTypes deserialized = std::move(get_result.value());
    ASSERT_TRUE(deserialized.opt_int_with_value.has_value());
    ASSERT_EQUAL(*deserialized.opt_int_with_value, 42);
    ASSERT_TRUE(deserialized.opt_string_with_value.has_value());
    ASSERT_EQUAL(*deserialized.opt_string_with_value, "optional_test");
    ASSERT_FALSE(deserialized.opt_int_null.has_value());
    ASSERT_FALSE(deserialized.opt_string_null.has_value());
#endif
    TEST_SUCCEED();
  }

  bool test_smart_pointer_types() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct SmartPointerTypes {
      std::unique_ptr<int> unique_int_with_value;
      std::shared_ptr<std::string> shared_string_with_value;
      std::unique_ptr<bool> unique_bool_with_value;
      std::unique_ptr<int> unique_int_null;
      std::shared_ptr<std::string> shared_string_null;
    };

    SmartPointerTypes test;
    test.unique_int_with_value = std::make_unique<int>(123);
    test.shared_string_with_value = std::make_shared<std::string>("shared_test");
    test.unique_bool_with_value = std::make_unique<bool>(true);
    test.unique_int_null = nullptr;
    test.shared_string_null = nullptr;

    auto result = builder::to_json_string(test);
    ASSERT_SUCCESS(result);

    std::string json = result.value();
    ASSERT_TRUE(json.find("\"unique_int_with_value\":123") != std::string::npos);
    ASSERT_TRUE(json.find("\"shared_string_with_value\":\"shared_test\"") != std::string::npos);
    ASSERT_TRUE(json.find("\"unique_bool_with_value\":true") != std::string::npos);
    ASSERT_TRUE(json.find("\"unique_int_null\":null") != std::string::npos);
    ASSERT_TRUE(json.find("\"shared_string_null\":null") != std::string::npos);

    // Test round-trip
    ondemand::parser parser;
    auto doc_result = parser.iterate(pad(json));
    ASSERT_SUCCESS(doc_result);

    auto get_result = doc_result.value().get<SmartPointerTypes>();
    ASSERT_SUCCESS(get_result);

    SmartPointerTypes deserialized = std::move(get_result.value());
    ASSERT_TRUE(deserialized.unique_int_with_value != nullptr);
    ASSERT_EQUAL(*deserialized.unique_int_with_value, 123);
    ASSERT_TRUE(deserialized.shared_string_with_value != nullptr);
    ASSERT_EQUAL(*deserialized.shared_string_with_value, "shared_test");
    ASSERT_TRUE(deserialized.unique_bool_with_value != nullptr);
    ASSERT_EQUAL(*deserialized.unique_bool_with_value, true);
    ASSERT_TRUE(deserialized.unique_int_null == nullptr);
    ASSERT_TRUE(deserialized.shared_string_null == nullptr);
#endif
    TEST_SUCCEED();
  }

  bool test_container_types() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct ContainerTypes {
      std::vector<int> int_vector;
      std::set<std::string> string_set;
      std::map<std::string, int> string_map;
    };

    ContainerTypes test;
    test.int_vector = {1, 2, 3, 4, 5};
    test.string_set = {"apple", "banana", "cherry"};
    test.string_map = {{"key1", 10}, {"key2", 20}, {"key3", 30}};

    auto result = builder::to_json_string(test);
    ASSERT_SUCCESS(result);

    std::string json = result.value();
    ASSERT_TRUE(json.find("\"int_vector\":[1,2,3,4,5]") != std::string::npos);
    ASSERT_TRUE(json.find("\"string_set\":[") != std::string::npos);
    ASSERT_TRUE(json.find("\"string_map\":{") != std::string::npos);

    // Test round-trip
    ondemand::parser parser;
    auto doc_result = parser.iterate(pad(json));
    ASSERT_SUCCESS(doc_result);

    auto get_result = doc_result.value().get<ContainerTypes>();
    ASSERT_SUCCESS(get_result);

    ContainerTypes deserialized = std::move(get_result.value());
    ASSERT_EQUAL(deserialized.int_vector.size(), 5);
    ASSERT_EQUAL(deserialized.string_set.size(), 3);
    ASSERT_EQUAL(deserialized.string_map.size(), 3);
    ASSERT_EQUAL(deserialized.int_vector[0], 1);
    ASSERT_EQUAL(deserialized.int_vector[4], 5);
#endif
    TEST_SUCCEED();
  }

  bool test_extract_into() {
    TEST_START();
#if SIMDJSON_STATIC_REFLECTION
    struct Car {
      std::string make;
      std::string model;
      int year;
      double price;
      std::optional<std::string> color;
    };

    ondemand::parser parser;

    // Test 1: Extract only specific fields
    {
      std::string json_str = R"({
        "make": "Toyota",
        "model": "Camry",
        "year": 2024,
        "price": 28999.99,
        "color": "Blue",
        "engine": "V6",
        "transmission": "Automatic"
      })";

      auto padded = pad(json_str);
      Car car{};
      auto doc = parser.iterate(padded);
      ASSERT_SUCCESS(doc);

      ondemand::object obj;
      auto obj_result = doc.get_object().get(obj);
      ASSERT_SUCCESS(obj_result);

      // Extract only 'make' and 'model'
      auto error = obj.extract_into<"make", "model">(car);
      ASSERT_SUCCESS(error);

      ASSERT_EQUAL(car.make, "Toyota");
      ASSERT_EQUAL(car.model, "Camry");
      ASSERT_EQUAL(car.year, 0);  // Not extracted
      ASSERT_EQUAL(car.price, 0);  // Not extracted
    }

    // Test 2: Extract with optional field
    {
      std::string json_str = R"({
        "make": "Honda",
        "model": "Accord",
        "year": 2023,
        "price": 26999.99,
        "color": "Red"
      })";

      auto padded = pad(json_str);
      Car car{};
      auto doc = parser.iterate(padded);
      ASSERT_SUCCESS(doc);

      ondemand::object obj;
      auto obj_result = doc.get_object().get(obj);
      ASSERT_SUCCESS(obj_result);

      // Extract including optional 'color'
      auto error = obj.extract_into<"make", "model", "color">(car);
      ASSERT_SUCCESS(error);

      ASSERT_EQUAL(car.make, "Honda");
      ASSERT_EQUAL(car.model, "Accord");
      ASSERT_TRUE(car.color.has_value());
      ASSERT_EQUAL(*car.color, "Red");
    }

    // Test 3: Extract with missing optional field
    {
      std::string json_str = R"({
        "make": "Ford",
        "model": "F-150",
        "year": 2024,
        "price": 35999.99
      })";

      auto padded = pad(json_str);
      Car car{};
      auto doc = parser.iterate(padded);
      ASSERT_SUCCESS(doc);

      ondemand::object obj;
      auto obj_result = doc.get_object().get(obj);
      ASSERT_SUCCESS(obj_result);

      // Try to extract including optional 'color' which doesn't exist
      auto error = obj.extract_into<"make", "model", "color">(car);
      ASSERT_SUCCESS(error);

      ASSERT_EQUAL(car.make, "Ford");
      ASSERT_EQUAL(car.model, "F-150");
      ASSERT_FALSE(car.color.has_value());  // Should be empty
    }

    // Test 4: Extract with custom deserializable type using tag_invoke
    {
      // Test using the Price struct defined at namespace level

      std::string json_str = R"({
        "name": "Laptop",
        "price": {
          "amount": 1000,
          "currency": "EUR"
        },
        "stock": 15,
        "description": "High-end gaming laptop"
      })";

      auto padded = pad(json_str);
      Product product{};
      auto doc = parser.iterate(padded);
      ASSERT_SUCCESS(doc);

      ondemand::object obj;
      auto obj_result = doc.get_object().get(obj);
      ASSERT_SUCCESS(obj_result);

      // Extract including price field with custom deserializer
      auto error = obj.extract_into<"name", "price">(product);
      ASSERT_SUCCESS(error);

      ASSERT_EQUAL(product.name, "Laptop");
      // Verify custom deserializer was invoked: EUR should be converted to USD
      ASSERT_EQUAL(product.price.currency, "USD");  // Should be converted from EUR
      // Verify custom deserializer was invoked: amount should be 1100 (1000 * 1.1)
      ASSERT_EQUAL(product.price.amount, 1100);  // Should be exactly 1100 after conversion
      ASSERT_EQUAL(product.stock, 0);  // Not extracted
    }

    // Test 5: Extract with nested custom deserializable types
    {
      // Test using the Dimensions struct defined at namespace level

      std::string json_str = R"({
        "id": "PKG123",
        "weight": {
          "value": 10,
          "unit": "pounds"
        },
        "length": {
          "value": 12,
          "unit": "inches"
        },
        "fragile": true
      })";

      auto padded = pad(json_str);
      Package pkg{};
      auto doc = parser.iterate(padded);
      ASSERT_SUCCESS(doc);

      ondemand::object obj;
      auto obj_result = doc.get_object().get(obj);
      ASSERT_SUCCESS(obj_result);

      // Extract only length (with custom deserializer), skip weight
      auto error = obj.extract_into<"id", "length">(pkg);
      ASSERT_SUCCESS(error);

      ASSERT_EQUAL(pkg.id, "PKG123");
      // Verify custom deserializer was invoked: inches should be converted to cm
      ASSERT_EQUAL(pkg.length.unit, "cm");  // Should be converted from inches
      // Verify exact conversion: 12 inches * 2.54 = 30.48 cm
      ASSERT_EQUAL(pkg.length.value, 30.48);  // Should be exactly 30.48 after conversion
      ASSERT_EQUAL(pkg.weight.unit, "");  // Weight not extracted
      ASSERT_EQUAL(pkg.weight.value, 0);  // Weight value should remain at default
    }
#endif
    TEST_SUCCEED();
  }


  bool run() {
    return test_primitive_types() &&
           test_string_types() &&
           test_optional_types() &&
           test_smart_pointer_types() &&
           test_container_types() &&
           test_extract_into();
  }

} // namespace builder_tests

int main(int argc, char *argv[]) {
  return test_main(argc, argv, builder_tests::run);
}