node/test/addons-napi/test_properties/test_properties.c

#include <node_api.h>
#include "../common.h"

static double value_ = 1;

napi_value GetValue(napi_env env, napi_callback_info info) {
  size_t argc = 0;
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, NULL, NULL, NULL));

  NAPI_ASSERT(env, argc == 0, "Wrong number of arguments");

  napi_value number;
  NAPI_CALL(env, napi_create_double(env, value_, &number));

  return number;
}

napi_value SetValue(napi_env env, napi_callback_info info) {
  size_t argc = 1;
  napi_value args[1];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc == 1, "Wrong number of arguments");

  NAPI_CALL(env, napi_get_value_double(env, args[0], &value_));

  return NULL;
}

napi_value Echo(napi_env env, napi_callback_info info) {
  size_t argc = 1;
  napi_value args[1];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc == 1, "Wrong number of arguments");

  return args[0];
}

napi_value HasNamedProperty(napi_env env, napi_callback_info info) {
  size_t argc = 2;
  napi_value args[2];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc == 2, "Wrong number of arguments");

  // Extract the name of the property to check
  char buffer[128];
  size_t copied;
  NAPI_CALL(env,
    napi_get_value_string_utf8(env, args[1], buffer, sizeof(buffer), &copied));

  // do the check and create the boolean return value
  bool value;
  napi_value result;
  NAPI_CALL(env, napi_has_named_property(env, args[0], buffer, &value));
  NAPI_CALL(env, napi_get_boolean(env, value, &result));

  return result;
}

void Init(napi_env env, napi_value exports, napi_value module, void* priv) {
  napi_value number;
  NAPI_CALL_RETURN_VOID(env, napi_create_double(env, value_, &number));

  napi_value name_value;
  NAPI_CALL_RETURN_VOID(env, napi_create_string_utf8(env,
                                                     "NameKeyValue",
                                                     -1,
                                                     &name_value));

  napi_value symbol_description;
  napi_value name_symbol;
  NAPI_CALL_RETURN_VOID(env, napi_create_string_utf8(env,
                                                     "NameKeySymbol",
                                                      -1,
                                                     &symbol_description));
  NAPI_CALL_RETURN_VOID(env, napi_create_symbol(env,
                                                symbol_description,
                                                &name_symbol));

  napi_property_descriptor properties[] = {
    { "echo", 0, Echo, 0, 0, 0, napi_enumerable, 0 },
    { "readwriteValue", 0, 0, 0, 0, number, napi_enumerable | napi_writable, 0 },
    { "readonlyValue", 0, 0, 0, 0, number, napi_enumerable, 0},
    { "hiddenValue", 0, 0, 0, 0, number, napi_default, 0},
    { NULL, name_value, 0, 0, 0, number, napi_enumerable, 0},
    { NULL, name_symbol, 0, 0, 0, number, napi_enumerable, 0},
    { "readwriteAccessor1", 0, 0, GetValue, SetValue, 0, napi_default, 0},
    { "readwriteAccessor2", 0, 0, GetValue, SetValue, 0, napi_writable, 0},
    { "readonlyAccessor1", 0, 0, GetValue, NULL, 0, napi_default, 0},
    { "readonlyAccessor2", 0, 0, GetValue, NULL, 0, napi_writable, 0},
    { "hasNamedProperty", 0, HasNamedProperty, 0, 0, 0, napi_default, 0 },
  };

  NAPI_CALL_RETURN_VOID(env, napi_define_properties(
    env, exports, sizeof(properties) / sizeof(*properties), properties));
}

NAPI_MODULE(addon, Init)