#include <limits.h> // INT_MAX

#include <cmath>

#define NAPI_EXPERIMENTAL

#include "js_native_api_v8.h"

#include "js_native_api.h"

#define CHECK_MAYBE_NOTHING(env, maybe, status) \

RETURN_STATUS_IF_FALSE((env), !((maybe).IsNothing()), (status))

#define CHECK_TO_NUMBER(env, context, result, src) \

CHECK_TO_TYPE((env), Number, (context), (result), (src), napi_number_expected)

#define CHECK_TO_BOOL(env, context, result, src) \

CHECK_TO_TYPE((env), Boolean, (context), (result), (src), \

napi_boolean_expected)

// n-api defines NAPI_AUTO_LENGHTH as the indicator that a string

// is null terminated. For V8 the equivalent is -1. The assert

// validates that our cast of NAPI_AUTO_LENGTH results in -1 as

// needed by V8.

#define CHECK_NEW_FROM_UTF8_LEN(env, result, str, len) \

do { \

static_assert(static_cast<int>(NAPI_AUTO_LENGTH) == -1, \

"Casting NAPI_AUTO_LENGTH to int must result in -1"); \

RETURN_STATUS_IF_FALSE((env), \

(len == NAPI_AUTO_LENGTH) || len <= INT_MAX, \

napi_invalid_arg); \

auto str_maybe = v8::String::NewFromUtf8( \

(env)->isolate, (str), v8::NewStringType::kInternalized, \

static_cast<int>(len)); \

CHECK_MAYBE_EMPTY((env), str_maybe, napi_generic_failure); \

(result) = str_maybe.ToLocalChecked(); \

} while (0)

#define CHECK_NEW_FROM_UTF8(env, result, str) \

CHECK_NEW_FROM_UTF8_LEN((env), (result), (str), NAPI_AUTO_LENGTH)

#define CREATE_TYPED_ARRAY( \

env, type, size_of_element, buffer, byte_offset, length, out) \

do { \

if ((size_of_element) > 1) { \

THROW_RANGE_ERROR_IF_FALSE( \

(env), (byte_offset) % (size_of_element) == 0, \

"ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT", \

"start offset of "#type" should be a multiple of "#size_of_element); \

} \

THROW_RANGE_ERROR_IF_FALSE((env), (length) * (size_of_element) + \

(byte_offset) <= buffer->ByteLength(), \

"ERR_NAPI_INVALID_TYPEDARRAY_LENGTH", \

"Invalid typed array length"); \

(out) = v8::type::New((buffer), (byte_offset), (length)); \

} while (0)

namespace v8impl {

namespace {

inline static napi_status

V8NameFromPropertyDescriptor(napi_env env,

const napi_property_descriptor* p,

v8::Local<v8::Name>* result) {

if (p->utf8name != nullptr) {

CHECK_NEW_FROM_UTF8(env, *result, p->utf8name);

} else {

v8::Local<v8::Value> property_value =

v8impl::V8LocalValueFromJsValue(p->name);

RETURN_STATUS_IF_FALSE(env, property_value->IsName(), napi_name_expected);

*result = property_value.As<v8::Name>();

}

return napi_ok;

}

// convert from n-api property attributes to v8::PropertyAttribute

inline static v8::PropertyAttribute V8PropertyAttributesFromDescriptor(

const napi_property_descriptor* descriptor) {

unsigned int attribute_flags = v8::PropertyAttribute::None;

if (descriptor->getter != nullptr || descriptor->setter != nullptr) {

// The napi_writable attribute is ignored for accessor descriptors, but

// V8 requires the ReadOnly attribute to match nonexistence of a setter.

attribute_flags |= (descriptor->setter == nullptr ?

v8::PropertyAttribute::ReadOnly : v8::PropertyAttribute::None);

} else if ((descriptor->attributes & napi_writable) == 0) {

attribute_flags |= v8::PropertyAttribute::ReadOnly;

}

if ((descriptor->attributes & napi_enumerable) == 0) {

attribute_flags |= v8::PropertyAttribute::DontEnum;

}

if ((descriptor->attributes & napi_configurable) == 0) {

attribute_flags |= v8::PropertyAttribute::DontDelete;

}

return static_cast<v8::PropertyAttribute>(attribute_flags);

}

inline static napi_deferred

JsDeferredFromNodePersistent(v8impl::Persistent<v8::Value>* local) {

return reinterpret_cast<napi_deferred>(local);

}

inline static v8impl::Persistent<v8::Value>*

NodePersistentFromJsDeferred(napi_deferred local) {

return reinterpret_cast<v8impl::Persistent<v8::Value>*>(local);

}

class HandleScopeWrapper {

public:

explicit HandleScopeWrapper(v8::Isolate* isolate) : scope(isolate) {}

private:

v8::HandleScope scope;

};

// In node v0.10 version of v8, there is no EscapableHandleScope and the

// node v0.10 port use HandleScope::Close(Local<T> v) to mimic the behavior

// of a EscapableHandleScope::Escape(Local<T> v), but it is not the same

// semantics. This is an example of where the api abstraction fail to work

// across different versions.

class EscapableHandleScopeWrapper {

public:

explicit EscapableHandleScopeWrapper(v8::Isolate* isolate)

: scope(isolate), escape_called_(false) {}

bool escape_called() const {

return escape_called_;

}

template <typename T>

v8::Local<T> Escape(v8::Local<T> handle) {

escape_called_ = true;

return scope.Escape(handle);

}

private:

v8::EscapableHandleScope scope;

bool escape_called_;

};

inline static napi_handle_scope

JsHandleScopeFromV8HandleScope(HandleScopeWrapper* s) {

return reinterpret_cast<napi_handle_scope>(s);

}

inline static HandleScopeWrapper*

V8HandleScopeFromJsHandleScope(napi_handle_scope s) {

return reinterpret_cast<HandleScopeWrapper*>(s);

}

inline static napi_escapable_handle_scope

JsEscapableHandleScopeFromV8EscapableHandleScope(

EscapableHandleScopeWrapper* s) {

return reinterpret_cast<napi_escapable_handle_scope>(s);

}

inline static EscapableHandleScopeWrapper*

V8EscapableHandleScopeFromJsEscapableHandleScope(

napi_escapable_handle_scope s) {

return reinterpret_cast<EscapableHandleScopeWrapper*>(s);

}

inline static napi_status ConcludeDeferred(napi_env env,

napi_deferred deferred,

napi_value result,

bool is_resolved) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

v8::Local<v8::Context> context = env->isolate->GetCurrentContext();

v8impl::Persistent<v8::Value>* deferred_ref =

NodePersistentFromJsDeferred(deferred);

v8::Local<v8::Value> v8_deferred =

v8::Local<v8::Value>::New(env->isolate, *deferred_ref);

auto v8_resolver = v8::Local<v8::Promise::Resolver>::Cast(v8_deferred);

v8::Maybe<bool> success = is_resolved ?

v8_resolver->Resolve(context, v8impl::V8LocalValueFromJsValue(result)) :

v8_resolver->Reject(context, v8impl::V8LocalValueFromJsValue(result));

delete deferred_ref;

RETURN_STATUS_IF_FALSE(env, success.FromMaybe(false), napi_generic_failure);

return GET_RETURN_STATUS(env);

}

// Wrapper around v8impl::Persistent that implements reference counting.

class Reference : private Finalizer {

private:

Reference(napi_env env,

v8::Local<v8::Value> value,

uint32_t initial_refcount,

bool delete_self,

napi_finalize finalize_callback,

void* finalize_data,

void* finalize_hint)

: Finalizer(env, finalize_callback, finalize_data, finalize_hint),

_persistent(env->isolate, value),

_refcount(initial_refcount),

_delete_self(delete_self) {

if (initial_refcount == 0) {

_persistent.SetWeak(

this, FinalizeCallback, v8::WeakCallbackType::kParameter);

}

}

public:

void* Data() {

return _finalize_data;

}

static Reference* New(napi_env env,

v8::Local<v8::Value> value,

uint32_t initial_refcount,

bool delete_self,

napi_finalize finalize_callback = nullptr,

void* finalize_data = nullptr,

void* finalize_hint = nullptr) {

return new Reference(env,

value,

initial_refcount,

delete_self,

finalize_callback,

finalize_data,

finalize_hint);

}

static void Delete(Reference* reference) {

delete reference;

}

uint32_t Ref() {

if (++_refcount == 1) {

_persistent.ClearWeak();

}

return _refcount;

}

uint32_t Unref() {

if (_refcount == 0) {

return 0;

}

if (--_refcount == 0) {

_persistent.SetWeak(

this, FinalizeCallback, v8::WeakCallbackType::kParameter);

}

return _refcount;

}

uint32_t RefCount() {

return _refcount;

}

v8::Local<v8::Value> Get() {

if (_persistent.IsEmpty()) {

return v8::Local<v8::Value>();

} else {

return v8::Local<v8::Value>::New(_env->isolate, _persistent);

}

}

private:

static void FinalizeCallback(const v8::WeakCallbackInfo<Reference>& data) {

Reference* reference = data.GetParameter();

reference->_persistent.Reset();

// Check before calling the finalize callback, because the callback might

// delete it.

bool delete_self = reference->_delete_self;

napi_env env = reference->_env;

if (reference->_finalize_callback != nullptr) {

NAPI_CALL_INTO_MODULE_THROW(env,

reference->_finalize_callback(

reference->_env,

reference->_finalize_data,

reference->_finalize_hint));

}

if (delete_self) {

Delete(reference);

}

}

v8impl::Persistent<v8::Value> _persistent;

uint32_t _refcount;

bool _delete_self;

};

enum UnwrapAction {

KeepWrap,

RemoveWrap

};

inline static napi_status Unwrap(napi_env env,

napi_value js_object,

void** result,

UnwrapAction action) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, js_object);

if (action == KeepWrap) {

CHECK_ARG(env, result);

}

v8::Isolate* isolate = env->isolate;

v8::Local<v8::Context> context = isolate->GetCurrentContext();

v8::Local<v8::Value> value = v8impl::V8LocalValueFromJsValue(js_object);

RETURN_STATUS_IF_FALSE(env, value->IsObject(), napi_invalid_arg);

v8::Local<v8::Object> obj = value.As<v8::Object>();

auto val = obj->GetPrivate(context, NAPI_PRIVATE_KEY(context, wrapper))

.ToLocalChecked();

RETURN_STATUS_IF_FALSE(env, val->IsExternal(), napi_invalid_arg);

Reference* reference =

static_cast<v8impl::Reference*>(val.As<v8::External>()->Value());

if (result) {

*result = reference->Data();

}

if (action == RemoveWrap) {

CHECK(obj->DeletePrivate(context, NAPI_PRIVATE_KEY(context, wrapper))

.FromJust());

Reference::Delete(reference);

}

return GET_RETURN_STATUS(env);

}

//=== Function napi_callback wrapper =================================

// Use this data structure to associate callback data with each N-API function

// exposed to JavaScript. The structure is stored in a v8::External which gets

// passed into our callback wrapper. This reduces the performance impact of

// calling through N-API.

// Ref: benchmark/misc/function_call

// Discussion (incl. perf. data): https://github.com/nodejs/node/pull/21072

struct CallbackBundle {

// Bind the lifecycle of `this` C++ object to a JavaScript object.

// We never delete a CallbackBundle C++ object directly.

void BindLifecycleTo(v8::Isolate* isolate, v8::Local<v8::Value> target) {

handle.Reset(isolate, target);

handle.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);

}

napi_env env; // Necessary to invoke C++ NAPI callback

void* cb_data; // The user provided callback data

napi_callback function_or_getter;

napi_callback setter;

v8impl::Persistent<v8::Value> handle; // Die with this JavaScript object

private:

static void WeakCallback(v8::WeakCallbackInfo<CallbackBundle> const& info) {

// Use the "WeakCallback mechanism" to delete the C++ `bundle` object.

// This will be called when the v8::External containing `this` pointer

// is being GC-ed.

CallbackBundle* bundle = info.GetParameter();

if (bundle != nullptr) {

delete bundle;

}

}

};

// Base class extended by classes that wrap V8 function and property callback

// info.

class CallbackWrapper {

public:

CallbackWrapper(napi_value this_arg, size_t args_length, void* data)

: _this(this_arg), _args_length(args_length), _data(data) {}

virtual napi_value GetNewTarget() = 0;

virtual void Args(napi_value* buffer, size_t bufferlength) = 0;

virtual void SetReturnValue(napi_value value) = 0;

napi_value This() { return _this; }

size_t ArgsLength() { return _args_length; }

void* Data() { return _data; }

protected:

const napi_value _this;

const size_t _args_length;

void* _data;

};

template <typename Info, napi_callback CallbackBundle::*FunctionField>

class CallbackWrapperBase : public CallbackWrapper {

public:

CallbackWrapperBase(const Info& cbinfo, const size_t args_length)

: CallbackWrapper(JsValueFromV8LocalValue(cbinfo.This()),

args_length,

nullptr),

_cbinfo(cbinfo) {

_bundle = reinterpret_cast<CallbackBundle*>(

v8::Local<v8::External>::Cast(cbinfo.Data())->Value());

_data = _bundle->cb_data;

}

napi_value GetNewTarget() override { return nullptr; }

protected:

void InvokeCallback() {

napi_callback_info cbinfo_wrapper = reinterpret_cast<napi_callback_info>(

static_cast<CallbackWrapper*>(this));

// All other pointers we need are stored in `_bundle`

napi_env env = _bundle->env;

napi_callback cb = _bundle->*FunctionField;

napi_value result;

NAPI_CALL_INTO_MODULE_THROW(env, result = cb(env, cbinfo_wrapper));

if (result != nullptr) {

this->SetReturnValue(result);

}

}

const Info& _cbinfo;

CallbackBundle* _bundle;

};

class FunctionCallbackWrapper

: public CallbackWrapperBase<v8::FunctionCallbackInfo<v8::Value>,

&CallbackBundle::function_or_getter> {

public:

static void Invoke(const v8::FunctionCallbackInfo<v8::Value>& info) {

FunctionCallbackWrapper cbwrapper(info);

cbwrapper.InvokeCallback();

}

explicit FunctionCallbackWrapper(

const v8::FunctionCallbackInfo<v8::Value>& cbinfo)

: CallbackWrapperBase(cbinfo, cbinfo.Length()) {}

napi_value GetNewTarget() override {

if (_cbinfo.IsConstructCall()) {

return v8impl::JsValueFromV8LocalValue(_cbinfo.NewTarget());

} else {

return nullptr;

}

}

/*virtual*/

void Args(napi_value* buffer, size_t buffer_length) override {

size_t i = 0;

size_t min = std::min(buffer_length, _args_length);

for (; i < min; i += 1) {

buffer[i] = v8impl::JsValueFromV8LocalValue(_cbinfo[i]);

}

if (i < buffer_length) {

napi_value undefined =

v8impl::JsValueFromV8LocalValue(v8::Undefined(_cbinfo.GetIsolate()));

for (; i < buffer_length; i += 1) {

buffer[i] = undefined;

}

}

}

/*virtual*/

void SetReturnValue(napi_value value) override {

v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);

_cbinfo.GetReturnValue().Set(val);

}

};

class GetterCallbackWrapper

: public CallbackWrapperBase<v8::PropertyCallbackInfo<v8::Value>,

&CallbackBundle::function_or_getter> {

public:

static void Invoke(v8::Local<v8::Name> property,

const v8::PropertyCallbackInfo<v8::Value>& info) {

GetterCallbackWrapper cbwrapper(info);

cbwrapper.InvokeCallback();

}

explicit GetterCallbackWrapper(

const v8::PropertyCallbackInfo<v8::Value>& cbinfo)

: CallbackWrapperBase(cbinfo, 0) {}

/*virtual*/

void Args(napi_value* buffer, size_t buffer_length) override {

if (buffer_length > 0) {

napi_value undefined =

v8impl::JsValueFromV8LocalValue(v8::Undefined(_cbinfo.GetIsolate()));

for (size_t i = 0; i < buffer_length; i += 1) {

buffer[i] = undefined;

}

}

}

/*virtual*/

void SetReturnValue(napi_value value) override {

v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);

_cbinfo.GetReturnValue().Set(val);

}

};

class SetterCallbackWrapper

: public CallbackWrapperBase<v8::PropertyCallbackInfo<void>,

&CallbackBundle::setter> {

public:

static void Invoke(v8::Local<v8::Name> property,

v8::Local<v8::Value> value,

const v8::PropertyCallbackInfo<void>& info) {

SetterCallbackWrapper cbwrapper(info, value);

cbwrapper.InvokeCallback();

}

SetterCallbackWrapper(const v8::PropertyCallbackInfo<void>& cbinfo,

const v8::Local<v8::Value>& value)

: CallbackWrapperBase(cbinfo, 1), _value(value) {}

/*virtual*/

void Args(napi_value* buffer, size_t buffer_length) override {

if (buffer_length > 0) {

buffer[0] = v8impl::JsValueFromV8LocalValue(_value);

if (buffer_length > 1) {

napi_value undefined = v8impl::JsValueFromV8LocalValue(

v8::Undefined(_cbinfo.GetIsolate()));

for (size_t i = 1; i < buffer_length; i += 1) {

buffer[i] = undefined;

}

}

}

}

/*virtual*/

void SetReturnValue(napi_value value) override {

// Ignore any value returned from a setter callback.

}

private:

const v8::Local<v8::Value>& _value;

};

// Creates an object to be made available to the static function callback

// wrapper, used to retrieve the native callback function and data pointer.

static

v8::Local<v8::Value> CreateFunctionCallbackData(napi_env env,

napi_callback cb,

void* data) {

CallbackBundle* bundle = new CallbackBundle();

bundle->function_or_getter = cb;

bundle->cb_data = data;

bundle->env = env;

v8::Local<v8::Value> cbdata = v8::External::New(env->isolate, bundle);

bundle->BindLifecycleTo(env->isolate, cbdata);

return cbdata;

}

// Creates an object to be made available to the static getter/setter

// callback wrapper, used to retrieve the native getter/setter callback

// function and data pointer.

inline v8::Local<v8::Value> CreateAccessorCallbackData(napi_env env,

napi_callback getter,

napi_callback setter,

void* data) {

CallbackBundle* bundle = new CallbackBundle();

bundle->function_or_getter = getter;

bundle->setter = setter;

bundle->cb_data = data;

bundle->env = env;

v8::Local<v8::Value> cbdata = v8::External::New(env->isolate, bundle);

bundle->BindLifecycleTo(env->isolate, cbdata);

return cbdata;

}

enum WrapType {

retrievable,

anonymous

};

template <WrapType wrap_type>

inline napi_status Wrap(napi_env env,

napi_value js_object,

void* native_object,

napi_finalize finalize_cb,

void* finalize_hint,

napi_ref* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, js_object);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Value> value = v8impl::V8LocalValueFromJsValue(js_object);

RETURN_STATUS_IF_FALSE(env, value->IsObject(), napi_invalid_arg);

v8::Local<v8::Object> obj = value.As<v8::Object>();

if (wrap_type == retrievable) {

// If we've already wrapped this object, we error out.

RETURN_STATUS_IF_FALSE(env,

!obj->HasPrivate(context, NAPI_PRIVATE_KEY(context, wrapper))

.FromJust(),

napi_invalid_arg);

} else if (wrap_type == anonymous) {

// If no finalize callback is provided, we error out.

CHECK_ARG(env, finalize_cb);

}

v8impl::Reference* reference = nullptr;

if (result != nullptr) {

// The returned reference should be deleted via napi_delete_reference()

// ONLY in response to the finalize callback invocation. (If it is deleted

// before then, then the finalize callback will never be invoked.)

// Therefore a finalize callback is required when returning a reference.

CHECK_ARG(env, finalize_cb);

reference = v8impl::Reference::New(

env, obj, 0, false, finalize_cb, native_object, finalize_hint);

*result = reinterpret_cast<napi_ref>(reference);

} else {

// Create a self-deleting reference.

reference = v8impl::Reference::New(env, obj, 0, true, finalize_cb,

native_object, finalize_cb == nullptr ? nullptr : finalize_hint);

}

if (wrap_type == retrievable) {

CHECK(obj->SetPrivate(context, NAPI_PRIVATE_KEY(context, wrapper),

v8::External::New(env->isolate, reference)).FromJust());

}

return GET_RETURN_STATUS(env);

}

} // end of anonymous namespace

} // end of namespace v8impl

// Warning: Keep in-sync with napi_status enum

static

const char* error_messages[] = {nullptr,

"Invalid argument",

"An object was expected",

"A string was expected",

"A string or symbol was expected",

"A function was expected",

"A number was expected",

"A boolean was expected",

"An array was expected",

"Unknown failure",

"An exception is pending",

"The async work item was cancelled",

"napi_escape_handle already called on scope",

"Invalid handle scope usage",

"Invalid callback scope usage",

"Thread-safe function queue is full",

"Thread-safe function handle is closing",

"A bigint was expected",

};

napi_status napi_get_last_error_info(napi_env env,

const napi_extended_error_info** result) {

CHECK_ENV(env);

CHECK_ARG(env, result);

// you must update this assert to reference the last message

// in the napi_status enum each time a new error message is added.

// We don't have a napi_status_last as this would result in an ABI

// change each time a message was added.

static_assert(

NAPI_ARRAYSIZE(error_messages) == napi_bigint_expected + 1,

"Count of error messages must match count of error values");

CHECK_LE(env->last_error.error_code, napi_callback_scope_mismatch);

// Wait until someone requests the last error information to fetch the error

// message string

env->last_error.error_message =

error_messages[env->last_error.error_code];

*result = &(env->last_error);

return napi_ok;

}

napi_status napi_create_function(napi_env env,

const char* utf8name,

size_t length,

napi_callback cb,

void* callback_data,

napi_value* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

CHECK_ARG(env, cb);

v8::Isolate* isolate = env->isolate;

v8::Local<v8::Function> return_value;

v8::EscapableHandleScope scope(isolate);

v8::Local<v8::Value> cbdata =

v8impl::CreateFunctionCallbackData(env, cb, callback_data);

RETURN_STATUS_IF_FALSE(env, !cbdata.IsEmpty(), napi_generic_failure);

v8::Local<v8::Context> context = env->context();

v8::MaybeLocal<v8::Function> maybe_function =

v8::Function::New(context,

v8impl::FunctionCallbackWrapper::Invoke,

cbdata);

CHECK_MAYBE_EMPTY(env, maybe_function, napi_generic_failure);

return_value = scope.Escape(maybe_function.ToLocalChecked());

if (utf8name != nullptr) {

v8::Local<v8::String> name_string;

CHECK_NEW_FROM_UTF8_LEN(env, name_string, utf8name, length);

return_value->SetName(name_string);

}

*result = v8impl::JsValueFromV8LocalValue(return_value);

return GET_RETURN_STATUS(env);

}

napi_status napi_define_class(napi_env env,

const char* utf8name,

size_t length,

napi_callback constructor,

void* callback_data,

size_t property_count,

const napi_property_descriptor* properties,

napi_value* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

CHECK_ARG(env, constructor);

v8::Isolate* isolate = env->isolate;

v8::EscapableHandleScope scope(isolate);

v8::Local<v8::Value> cbdata =

v8impl::CreateFunctionCallbackData(env, constructor, callback_data);

RETURN_STATUS_IF_FALSE(env, !cbdata.IsEmpty(), napi_generic_failure);

v8::Local<v8::FunctionTemplate> tpl = v8::FunctionTemplate::New(

isolate, v8impl::FunctionCallbackWrapper::Invoke, cbdata);

v8::Local<v8::String> name_string;

CHECK_NEW_FROM_UTF8_LEN(env, name_string, utf8name, length);

tpl->SetClassName(name_string);

size_t static_property_count = 0;

for (size_t i = 0; i < property_count; i++) {

const napi_property_descriptor* p = properties + i;

if ((p->attributes & napi_static) != 0) {

// Static properties are handled separately below.

static_property_count++;

continue;

}

v8::Local<v8::Name> property_name;

napi_status status =

v8impl::V8NameFromPropertyDescriptor(env, p, &property_name);

if (status != napi_ok) {

return napi_set_last_error(env, status);

}

v8::PropertyAttribute attributes =

v8impl::V8PropertyAttributesFromDescriptor(p);

// This code is similar to that in napi_define_properties(); the

// difference is it applies to a template instead of an object.

if (p->getter != nullptr || p->setter != nullptr) {

v8::Local<v8::Value> cbdata = v8impl::CreateAccessorCallbackData(

env, p->getter, p->setter, p->data);

tpl->PrototypeTemplate()->SetAccessor(

property_name,

p->getter ? v8impl::GetterCallbackWrapper::Invoke : nullptr,

p->setter ? v8impl::SetterCallbackWrapper::Invoke : nullptr,

cbdata,

v8::AccessControl::DEFAULT,

attributes);

} else if (p->method != nullptr) {

v8::Local<v8::Value> cbdata =

v8impl::CreateFunctionCallbackData(env, p->method, p->data);

RETURN_STATUS_IF_FALSE(env, !cbdata.IsEmpty(), napi_generic_failure);

v8::Local<v8::FunctionTemplate> t =

v8::FunctionTemplate::New(isolate,

v8impl::FunctionCallbackWrapper::Invoke,

cbdata,

v8::Signature::New(isolate, tpl));

tpl->PrototypeTemplate()->Set(property_name, t, attributes);

} else {

v8::Local<v8::Value> value = v8impl::V8LocalValueFromJsValue(p->value);

tpl->PrototypeTemplate()->Set(property_name, value, attributes);

}

}

v8::Local<v8::Context> context = env->context();

*result = v8impl::JsValueFromV8LocalValue(

scope.Escape(tpl->GetFunction(context).ToLocalChecked()));

if (static_property_count > 0) {

std::vector<napi_property_descriptor> static_descriptors;

static_descriptors.reserve(static_property_count);

for (size_t i = 0; i < property_count; i++) {

const napi_property_descriptor* p = properties + i;

if ((p->attributes & napi_static) != 0) {

static_descriptors.push_back(*p);

}

}

napi_status status =

napi_define_properties(env,

*result,

static_descriptors.size(),

static_descriptors.data());

if (status != napi_ok) return status;

}

return GET_RETURN_STATUS(env);

}

napi_status napi_get_property_names(napi_env env,

napi_value object,

napi_value* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

auto maybe_propertynames = obj->GetPropertyNames(context);

CHECK_MAYBE_EMPTY(env, maybe_propertynames, napi_generic_failure);

*result = v8impl::JsValueFromV8LocalValue(

maybe_propertynames.ToLocalChecked());

return GET_RETURN_STATUS(env);

}

napi_status napi_set_property(napi_env env,

napi_value object,

napi_value key,

napi_value value) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, key);

CHECK_ARG(env, value);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Local<v8::Value> k = v8impl::V8LocalValueFromJsValue(key);

v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);

v8::Maybe<bool> set_maybe = obj->Set(context, k, val);

RETURN_STATUS_IF_FALSE(env, set_maybe.FromMaybe(false), napi_generic_failure);

return GET_RETURN_STATUS(env);

}

napi_status napi_has_property(napi_env env,

napi_value object,

napi_value key,

bool* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

CHECK_ARG(env, key);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Local<v8::Value> k = v8impl::V8LocalValueFromJsValue(key);

v8::Maybe<bool> has_maybe = obj->Has(context, k);

CHECK_MAYBE_NOTHING(env, has_maybe, napi_generic_failure);

*result = has_maybe.FromMaybe(false);

return GET_RETURN_STATUS(env);

}

napi_status napi_get_property(napi_env env,

napi_value object,

napi_value key,

napi_value* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, key);

CHECK_ARG(env, result);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Value> k = v8impl::V8LocalValueFromJsValue(key);

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

auto get_maybe = obj->Get(context, k);

CHECK_MAYBE_EMPTY(env, get_maybe, napi_generic_failure);

v8::Local<v8::Value> val = get_maybe.ToLocalChecked();

*result = v8impl::JsValueFromV8LocalValue(val);

return GET_RETURN_STATUS(env);

}

napi_status napi_delete_property(napi_env env,

napi_value object,

napi_value key,

bool* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, key);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Value> k = v8impl::V8LocalValueFromJsValue(key);

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Maybe<bool> delete_maybe = obj->Delete(context, k);

CHECK_MAYBE_NOTHING(env, delete_maybe, napi_generic_failure);

if (result != nullptr)

*result = delete_maybe.FromMaybe(false);

return GET_RETURN_STATUS(env);

}

napi_status napi_has_own_property(napi_env env,

napi_value object,

napi_value key,

bool* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, key);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Local<v8::Value> k = v8impl::V8LocalValueFromJsValue(key);

RETURN_STATUS_IF_FALSE(env, k->IsName(), napi_name_expected);

v8::Maybe<bool> has_maybe = obj->HasOwnProperty(context, k.As<v8::Name>());

CHECK_MAYBE_NOTHING(env, has_maybe, napi_generic_failure);

*result = has_maybe.FromMaybe(false);

return GET_RETURN_STATUS(env);

}

napi_status napi_set_named_property(napi_env env,

napi_value object,

const char* utf8name,

napi_value value) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, value);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Local<v8::Name> key;

CHECK_NEW_FROM_UTF8(env, key, utf8name);

v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);

v8::Maybe<bool> set_maybe = obj->Set(context, key, val);

RETURN_STATUS_IF_FALSE(env, set_maybe.FromMaybe(false), napi_generic_failure);

return GET_RETURN_STATUS(env);

}

napi_status napi_has_named_property(napi_env env,

napi_value object,

const char* utf8name,

bool* result) {

NAPI_PREAMBLE(env);

CHECK_ARG(env, result);

v8::Local<v8::Context> context = env->context();

v8::Local<v8::Object> obj;

CHECK_TO_OBJECT(env, context, obj, object);

v8::Local<v8::Name> key;

CHECK_NEW_FROM_UTF8(env, key, utf8name);

v8::Maybe<bool> has_maybe = obj->Has(context, key);

CHECK_MAYBE_NOTHING(env, has_maybe, napi_generic_failure);

*result = has_maybe.FromMaybe(false);

return GET_RETURN_STATUS(env);

}

napi_status napi_get_named_property(napi_env env,