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#include "myobject.h"
napi_ref MyObject::constructor;
MyObject::MyObject(double value)
: value_(value), env_(nullptr), wrapper_(nullptr) {}
MyObject::~MyObject() { napi_delete_reference(env_, wrapper_); }
void MyObject::Destructor(
napi_env env, void* nativeObject, void* /*finalize_hint*/) {
MyObject* obj = static_cast<MyObject*>(nativeObject);
delete obj;
}
#define DECLARE_NAPI_METHOD(name, func) \
{ name, func, 0, 0, 0, napi_default, 0 }
void MyObject::Init(napi_env env, napi_value exports) {
napi_status status;
napi_property_descriptor properties[] = {
{ "value", nullptr, GetValue, SetValue, 0, napi_default, 0 },
DECLARE_NAPI_METHOD("plusOne", PlusOne),
DECLARE_NAPI_METHOD("multiply", Multiply),
};
napi_value cons;
status =
napi_define_class(env, "MyObject", New, nullptr, 3, properties, &cons);
if (status != napi_ok) return;
status = napi_create_reference(env, cons, 1, &constructor);
if (status != napi_ok) return;
status = napi_set_named_property(env, exports, "MyObject", cons);
if (status != napi_ok) return;
}
void MyObject::New(napi_env env, napi_callback_info info) {
napi_status status;
bool is_constructor;
status = napi_is_construct_call(env, info, &is_constructor);
if (status != napi_ok) return;
if (is_constructor) {
// Invoked as constructor: `new MyObject(...)`
napi_value args[1];
status = napi_get_cb_args(env, info, args, 1);
if (status != napi_ok) return;
double value = 0;
napi_valuetype valuetype;
status = napi_typeof(env, args[0], &valuetype);
if (status != napi_ok) return;
if (valuetype != napi_undefined) {
status = napi_get_value_double(env, args[0], &value);
if (status != napi_ok) return;
}
MyObject* obj = new MyObject(value);
napi_value jsthis;
status = napi_get_cb_this(env, info, &jsthis);
if (status != napi_ok) return;
obj->env_ = env;
status = napi_wrap(env,
jsthis,
obj,
MyObject::Destructor,
nullptr, // finalize_hint
&obj->wrapper_);
if (status != napi_ok) return;
status = napi_set_return_value(env, info, jsthis);
if (status != napi_ok) return;
} else {
// Invoked as plain function `MyObject(...)`, turn into construct call.
napi_value args[1];
status = napi_get_cb_args(env, info, args, 1);
if (status != napi_ok) return;
const int argc = 1;
napi_value argv[argc] = {args[0]};
napi_value cons;
status = napi_get_reference_value(env, constructor, &cons);
if (status != napi_ok) return;
napi_value instance;
status = napi_new_instance(env, cons, argc, argv, &instance);
if (status != napi_ok) return;
status = napi_set_return_value(env, info, instance);
if (status != napi_ok) return;
}
}
void MyObject::GetValue(napi_env env, napi_callback_info info) {
napi_status status;
napi_value jsthis;
status = napi_get_cb_this(env, info, &jsthis);
if (status != napi_ok) return;
MyObject* obj;
status = napi_unwrap(env, jsthis, reinterpret_cast<void**>(&obj));
if (status != napi_ok) return;
napi_value num;
status = napi_create_number(env, obj->value_, &num);
if (status != napi_ok) return;
status = napi_set_return_value(env, info, num);
if (status != napi_ok) return;
}
void MyObject::SetValue(napi_env env, napi_callback_info info) {
napi_status status;
napi_value value;
status = napi_get_cb_args(env, info, &value, 1);
if (status != napi_ok) return;
napi_value jsthis;
status = napi_get_cb_this(env, info, &jsthis);
if (status != napi_ok) return;
MyObject* obj;
status = napi_unwrap(env, jsthis, reinterpret_cast<void**>(&obj));
if (status != napi_ok) return;
status = napi_get_value_double(env, value, &obj->value_);
if (status != napi_ok) return;
}
void MyObject::PlusOne(napi_env env, napi_callback_info info) {
napi_status status;
napi_value jsthis;
status = napi_get_cb_this(env, info, &jsthis);
if (status != napi_ok) return;
MyObject* obj;
status = napi_unwrap(env, jsthis, reinterpret_cast<void**>(&obj));
if (status != napi_ok) return;
obj->value_ += 1;
napi_value num;
status = napi_create_number(env, obj->value_, &num);
if (status != napi_ok) return;
status = napi_set_return_value(env, info, num);
if (status != napi_ok) return;
}
void MyObject::Multiply(napi_env env, napi_callback_info info) {
napi_status status;
napi_value args[1];
status = napi_get_cb_args(env, info, args, 1);
if (status != napi_ok) return;
napi_valuetype valuetype;
status = napi_typeof(env, args[0], &valuetype);
if (status != napi_ok) return;
double multiple = 1;
if (valuetype != napi_undefined) {
status = napi_get_value_double(env, args[0], &multiple);
if (status != napi_ok) return;
}
napi_value jsthis;
status = napi_get_cb_this(env, info, &jsthis);
if (status != napi_ok) return;
MyObject* obj;
status = napi_unwrap(env, jsthis, reinterpret_cast<void**>(&obj));
if (status != napi_ok) return;
napi_value cons;
status = napi_get_reference_value(env, constructor, &cons);
if (status != napi_ok) return;
const int kArgCount = 1;
napi_value argv[kArgCount];
status = napi_create_number(env, obj->value_ * multiple, argv);
if (status != napi_ok) return;
napi_value instance;
status = napi_new_instance(env, cons, kArgCount, argv, &instance);
if (status != napi_ok) return;
status = napi_set_return_value(env, info, instance);
if (status != napi_ok) return;
}
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