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naah_inl.h
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naah_inl.h
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#ifndef SRC_NAAH_INL_H_
#define SRC_NAAH_INL_H_
#include <string_view>
#include <tuple>
#include <type_traits>
#include <variant>
namespace naah {
namespace details {
template <typename T, typename Enable = void>
struct is_optional : std::false_type {};
template <typename T>
struct is_optional<std::optional<T>> : std::true_type {};
template <class T>
struct remove_optional {
typedef T type;
};
template <class T>
struct remove_optional<std::optional<T>> {
typedef T type;
};
template <typename T>
struct get_class_of_member_function;
template <typename C, typename R, typename... Args>
struct get_class_of_member_function<R (C::*)(Args...) const> {
typedef C type;
};
template <typename C, typename R, typename... Args>
struct get_class_of_member_function<R (C::*)(Args...)> {
typedef C type;
};
// inspired by https://stackoverflow.com/a/12283159
template <typename T>
struct get_signature : public get_signature<decltype(&T::operator())> {};
template <typename C, typename R, typename... Args>
struct get_signature<R (C::*)(Args...) const> {
typedef R ret;
typedef std::tuple<Args...> args;
};
template <typename C, typename R, typename... Args>
struct get_signature<R (C::*)(Args...)> {
typedef R ret;
typedef std::tuple<Args...> args;
};
template <typename R, typename... Args>
struct get_signature<R (*)(Args...)> {
typedef R ret;
typedef std::tuple<Args...> args;
};
template <typename R, typename... Args>
struct get_signature<R(Args...)> {
typedef R ret;
typedef std::tuple<Args...> args;
};
template <typename T>
struct get_tuple_elements;
template <>
struct get_tuple_elements<std::tuple<>> {
typedef void head;
typedef std::tuple<> rest;
};
template <typename Head, typename... Rest>
struct get_tuple_elements<std::tuple<Head, Rest...>> {
typedef Head head;
typedef std::tuple<Rest...> rest;
};
template <typename T>
class ArgsConverter;
template <>
class ArgsConverter<std::tuple<>> {
public:
template <typename Args>
static std::optional<std::tuple<>> Get(Args &&, size_t) {
return std::tuple<>();
}
};
template <typename Head, typename... Rest>
class ArgsConverter<std::tuple<Head, Rest...>> {
public:
template <typename Args>
static std::optional<std::tuple<Head, Rest...>> Get(Args &&args, size_t i) {
using Real = typename remove_optional<Head>::type;
std::optional<Real> opt_head = ValueTransformer<Real>::FromJS(args[i]);
if constexpr (!is_optional<Head>::value) {
if (!opt_head.has_value()) {
return {};
}
}
std::optional<std::tuple<Rest...>> rest =
ArgsConverter<std::tuple<Rest...>>::Get(std::forward<Args>(args),
i + 1);
if (!rest.has_value()) {
return {};
}
if constexpr (is_optional<Head>::value) {
return std::tuple_cat(std::make_tuple(std::move(opt_head)),
std::move(*rest));
} else {
return std::tuple_cat(std::make_tuple(std::move(*opt_head)),
std::move(*rest));
}
}
};
template <typename T, typename Enable = void>
struct is_result : std::false_type {};
template <typename T, typename E>
struct is_result<Result<T, E>> : std::true_type {};
template <class T>
struct result_type;
template <typename T_, typename E_>
struct result_type<Result<T_, E_>> {
typedef T_ T;
typedef E_ E;
};
} // namespace details
template <>
struct ValueTransformer<Undefined> {
static std::optional<Undefined> FromJS(Napi::Value v) {
if (!v.IsUndefined()) {
return {};
}
return Undefined{};
}
static Napi::Value ToJS(Napi::Env env, Undefined) { return env.Undefined(); }
};
template <>
struct ValueTransformer<Null> {
static std::optional<Null> FromJS(Napi::Value v) {
if (!v.IsNull()) {
return {};
}
return Null{};
}
static Napi::Value ToJS(Napi::Env env, Null) { return env.Null(); }
};
template <>
struct ValueTransformer<Napi::Value> {
static std::optional<Napi::Value> FromJS(Napi::Value v) { return v; }
static Napi::Value ToJS(Napi::Env, Napi::Value val) { return val; }
};
template <typename T, bool (Napi::Value::*IsT)() const>
struct JSValueTransformer {
static std::optional<T> FromJS(Napi::Value value) {
if (!(value.*IsT)()) {
return {};
}
return value.As<T>();
}
static Napi::Value ToJS(Napi::Env, T val) { return val; }
};
template <>
struct ValueTransformer<Napi::Boolean>
: public JSValueTransformer<Napi::Boolean, &Napi::Value::IsBoolean> {};
template <>
struct ValueTransformer<Napi::Number>
: public JSValueTransformer<Napi::Number, &Napi::Value::IsNumber> {};
#if NAPI_VERSION > 5
template <>
struct ValueTransformer<Napi::BigInt>
: public JSValueTransformer<Napi::BigInt, &Napi::Value::IsBigInt> {};
#endif
#if (NAPI_VERSION > 4)
template <>
struct ValueTransformer<Napi::Date>
: public JSValueTransformer<Napi::Date, &Napi::Value::IsDate> {};
#endif
template <>
struct ValueTransformer<Napi::String>
: public JSValueTransformer<Napi::String, &Napi::Value::IsString> {};
template <>
struct ValueTransformer<Napi::Symbol>
: public JSValueTransformer<Napi::Symbol, &Napi::Value::IsSymbol> {};
template <>
struct ValueTransformer<Napi::Array>
: public JSValueTransformer<Napi::Array, &Napi::Value::IsArray> {};
template <>
struct ValueTransformer<Napi::ArrayBuffer>
: public JSValueTransformer<Napi::ArrayBuffer,
&Napi::Value::IsArrayBuffer> {};
template <>
struct ValueTransformer<Napi::TypedArray>
: public JSValueTransformer<Napi::TypedArray, &Napi::Value::IsTypedArray> {
};
template <>
struct ValueTransformer<Napi::Object>
: public JSValueTransformer<Napi::Object, &Napi::Value::IsObject> {};
template <>
struct ValueTransformer<Napi::Function>
: public JSValueTransformer<Napi::Function, &Napi::Value::IsFunction> {};
template <>
struct ValueTransformer<Napi::Promise>
: public JSValueTransformer<Napi::Promise, &Napi::Value::IsPromise> {};
template <>
struct ValueTransformer<Napi::DataView>
: public JSValueTransformer<Napi::DataView, &Napi::Value::IsDataView> {};
template <typename T>
struct ValueTransformer<Napi::Buffer<T>>
: public JSValueTransformer<Napi::Buffer<T>, &Napi::Value::IsBuffer> {};
template <typename T>
struct ValueTransformer<Napi::External<T>>
: public JSValueTransformer<Napi::External<T>, &Napi::Value::IsExternal> {};
template <typename T, napi_typedarray_type type>
struct TypedArrayTransformer {
static std::optional<T> FromJS(Napi::Value value) {
if (!value.IsTypedArray()) {
return {};
}
Napi::TypedArray arr = value.As<Napi::TypedArray>();
if (arr.TypedArrayType() != type) {
return {};
}
return value.As<T>();
}
static Napi::Value ToJS(Napi::Env, T val) { return val; }
};
template <>
struct ValueTransformer<Napi::Int8Array>
: public TypedArrayTransformer<Napi::Int8Array, napi_int8_array> {};
template <>
struct ValueTransformer<Napi::Uint8Array> {
static std::optional<Napi::Uint8Array> FromJS(Napi::Value value) {
if (!value.IsTypedArray()) {
return {};
}
Napi::TypedArray arr = value.As<Napi::TypedArray>();
if (arr.TypedArrayType() != napi_uint8_array &&
arr.TypedArrayType() != napi_uint8_clamped_array) {
return {};
}
return value.As<Napi::Uint8Array>();
}
static Napi::Value ToJS(Napi::Env, Napi::Uint8Array val) { return val; }
};
template <>
struct ValueTransformer<Napi::Int16Array>
: public TypedArrayTransformer<Napi::Int16Array, napi_int16_array> {};
template <>
struct ValueTransformer<Napi::Uint16Array>
: public TypedArrayTransformer<Napi::Uint16Array, napi_uint16_array> {};
template <>
struct ValueTransformer<Napi::Int32Array>
: public TypedArrayTransformer<Napi::Int32Array, napi_int32_array> {};
template <>
struct ValueTransformer<Napi::Uint32Array>
: public TypedArrayTransformer<Napi::Uint32Array, napi_uint32_array> {};
template <>
struct ValueTransformer<Napi::Float32Array>
: public TypedArrayTransformer<Napi::Float32Array, napi_float32_array> {};
template <>
struct ValueTransformer<Napi::Float64Array>
: public TypedArrayTransformer<Napi::Float64Array, napi_float64_array> {};
#if NAPI_VERSION > 5
template <>
struct ValueTransformer<Napi::BigInt64Array>
: public TypedArrayTransformer<Napi::BigInt64Array, napi_bigint64_array> {};
template <>
struct ValueTransformer<Napi::BigUint64Array>
: public TypedArrayTransformer<Napi::BigUint64Array, napi_biguint64_array> {
};
#endif
template <>
struct ValueTransformer<bool> {
static std::optional<bool> FromJS(Napi::Value value) {
if (!value.IsBoolean()) {
return {};
}
return value.As<Napi::Boolean>().Value();
}
static Napi::Value ToJS(Napi::Env env, bool num) {
return Napi::Boolean::New(env, num);
}
};
template <>
struct ValueTransformer<double> {
static std::optional<double> FromJS(Napi::Value value) {
if (!value.IsNumber()) {
return {};
}
return value.As<Napi::Number>().DoubleValue();
}
static Napi::Value ToJS(Napi::Env env, double num) {
return Napi::Number::New(env, num);
}
};
template <>
struct ValueTransformer<float> {
static std::optional<float> FromJS(Napi::Value value) {
if (!value.IsNumber()) {
return {};
}
return value.As<Napi::Number>().FloatValue();
}
static Napi::Value ToJS(Napi::Env env, float num) {
return Napi::Number::New(env, num);
}
};
template <typename Uint>
struct ValueTransformer<Uint,
std::enable_if_t<std::is_same_v<Uint, uint8_t> ||
std::is_same_v<Uint, uint16_t> ||
std::is_same_v<Uint, uint32_t>>> {
static std::optional<Uint> FromJS(Napi::Value value) {
if (!value.IsNumber()) {
return {};
}
return value.As<Napi::Number>().Uint32Value();
}
static Napi::Value ToJS(Napi::Env env, Uint num) {
return Napi::Number::New(env, num);
}
};
template <typename Int>
struct ValueTransformer<Int, std::enable_if_t<std::is_same_v<Int, int8_t> ||
std::is_same_v<Int, int16_t> ||
std::is_same_v<Int, int32_t>>> {
static std::optional<Int> FromJS(Napi::Value value) {
if (!value.IsNumber()) {
return {};
}
return value.As<Napi::Number>().Int32Value();
}
static Napi::Value ToJS(Napi::Env env, Int num) {
return Napi::Number::New(env, num);
}
};
#if NAPI_VERSION > 5
template <>
struct ValueTransformer<int64_t> {
static std::optional<int64_t> FromJS(Napi::Value value) {
if (!value.IsBigInt()) {
return {};
}
bool lossless = true;
return value.As<Napi::BigInt>().Int64Value(&lossless);
}
static Napi::Value ToJS(Napi::Env env, int64_t num) {
return Napi::BigInt::New(env, num);
}
};
template <>
struct ValueTransformer<uint64_t> {
static std::optional<uint64_t> FromJS(Napi::Value value) {
if (!value.IsBigInt()) {
return {};
}
bool lossless = true;
return value.As<Napi::BigInt>().Uint64Value(&lossless);
}
static Napi::Value ToJS(Napi::Env env, uint64_t num) {
return Napi::BigInt::New(env, num);
}
};
#endif
template <typename T>
struct ValueTransformer<
T, std::enable_if_t<std::is_convertible_v<T, const char *>>> {
public:
static Napi::Value ToJS(Napi::Env env, T str) {
return Napi::String::New(env, str);
}
};
template <>
struct ValueTransformer<std::string_view> {
static Napi::Value ToJS(Napi::Env env, std::string_view str) {
return Napi::String::New(env, str.data(), str.size());
}
};
template <>
struct ValueTransformer<std::u16string_view> {
static Napi::Value ToJS(Napi::Env env, std::u16string_view str) {
return Napi::String::New(env, str.data(), str.size());
}
};
template <>
struct ValueTransformer<std::string> {
static std::optional<std::string> FromJS(Napi::Value value) {
if (!value.IsString()) {
return {};
}
return value.As<Napi::String>().Utf8Value();
}
static Napi::Value ToJS(Napi::Env env, std::string str) {
return Napi::String::New(env, str);
}
};
template <>
struct ValueTransformer<std::u16string> {
static std::optional<std::u16string> FromJS(Napi::Value value) {
if (!value.IsString()) {
return {};
}
return value.As<Napi::String>().Utf16Value();
}
static Napi::Value ToJS(Napi::Env env, std::u16string str) {
return Napi::String::New(env, str);
}
};
template <typename T>
struct ValueTransformer<std::optional<T>> {
static Napi::Value ToJS(Napi::Env env, std::optional<T> val) {
if (val.has_value()) {
return ValueTransformer<T>::ToJS(env, std::move(*val));
}
return env.Undefined();
}
};
template <typename... Args>
struct ValueTransformer<std::variant<Args...>> {
private:
using Variants = std::variant<Args...>;
template <size_t I>
static std::optional<Variants> FromJS([[maybe_unused]] Napi::Value value) {
if constexpr (I < sizeof...(Args)) {
using TypeI = std::variant_alternative_t<I, Variants>;
std::optional<TypeI> result = ValueTransformer<TypeI>::FromJS(value);
if (result.has_value()) {
return std::move(*result);
}
return FromJS<I + 1>(value);
} else {
return {};
}
}
public:
static std::optional<Variants> FromJS(Napi::Value value) {
return FromJS<0>(value);
}
static Napi::Value ToJS(Napi::Env env, Variants v) {
return std::visit(
[&](auto &&arg) -> Napi::Value {
using T = std::decay_t<decltype(arg)>;
return ValueTransformer<T>::ToJS(env, std::move(arg));
},
v);
}
};
template <typename... Args>
struct ValueTransformer<std::tuple<Args...>> {
private:
using Tuple = std::tuple<Args...>;
template <size_t... Is>
static std::vector<napi_value> ToVectorImpl([[maybe_unused]] Napi::Env env,
[[maybe_unused]] Tuple t,
std::index_sequence<Is...>) {
std::vector<napi_value> result(std::tuple_size_v<Tuple>);
((result[Is] = ValueTransformer<std::tuple_element_t<Is, Tuple>>::ToJS(
env, std::move(std::get<Is>(t)))),
...);
return result;
}
public:
static std::vector<napi_value> ToVector(Napi::Env env, Tuple t) {
return ToVectorImpl(env, std::move(t), std::index_sequence_for<Args...>{});
}
static std::optional<Tuple> FromJS(Napi::Value value) {
if (!value.IsArray()) {
return {};
}
return details::ArgsConverter<Tuple>::Get(value.As<Napi::Array>(), 0);
}
static Napi::Value ToJS(Napi::Env env, Tuple t) {
return std::apply(
[&](auto &&...elements) -> Napi::Array {
constexpr size_t size = sizeof...(elements);
Napi::Array result = Napi::Array::New(env, size);
std::vector<napi_value> vec = ToVector(env, std::move(t));
for (uint32_t i = 0; i < vec.size(); i++) {
result.Set(i, Napi::Value(env, vec[i]));
}
return result;
},
t);
}
};
template <typename T>
struct ValueTransformer<std::vector<T>> {
static std::optional<std::vector<T>> FromJS(Napi::Value value) {
if (!value.IsArray()) {
return {};
}
Napi::Array arr = value.As<Napi::Array>();
uint32_t len = arr.Length();
std::vector<T> result;
result.reserve(len);
for (uint32_t i = 0; i < len; i++) {
std::optional<T> item = ValueTransformer<T>::FromJS(arr.Get(i));
if (!item.has_value()) {
return {};
}
result.push_back(std::move(*item));
}
return result;
}
static Napi::Value ToJS(Napi::Env env, std::vector<T> arr) {
Napi::Array result = Napi::Array::New(env, arr.size());
for (uint32_t i = 0; i < arr.size(); i++) {
result.Set(i, ValueTransformer<T>::ToJS(env, std::move(arr[i])));
}
return result;
}
};
template <>
struct ValueTransformer<ArrayBuffer> {
static std::optional<ArrayBuffer> FromJS(Napi::Value value) {
if (!value.IsArrayBuffer()) {
return {};
}
Napi::ArrayBuffer buf = value.As<Napi::ArrayBuffer>();
return ArrayBuffer(static_cast<char *>(buf.Data()),
static_cast<char *>(buf.Data()) + buf.ByteLength());
}
static Napi::Value ToJS(Napi::Env env, ArrayBuffer arr) {
ArrayBuffer *arr_ptr = new ArrayBuffer(std::move(arr));
return Napi::ArrayBuffer::New(
env, arr_ptr->data(), arr_ptr->size(),
[](napi_env, void *, void *hint) {
delete static_cast<ArrayBuffer *>(hint);
},
arr_ptr);
}
};
template <typename E, napi_typedarray_type type>
struct ValueTransformer<TypedArrayOf<E, type>> {
private:
using T = TypedArrayOf<E, type>;
public:
static std::optional<T> FromJS(Napi::Value value) {
if (!value.IsTypedArray()) {
return {};
}
Napi::TypedArray arr = value.As<Napi::TypedArray>();
if (arr.TypedArrayType() != type) {
return {};
}
Napi::TypedArrayOf<E> typed_arr = arr.As<Napi::TypedArrayOf<E>>();
return T(typed_arr->Data(), typed_arr->Data() + typed_arr->Length());
}
static Napi::Value ToJS(Napi::Env env, T arr) {
T *arr_ptr = new T(std::move(arr));
Napi::ArrayBuffer buf = Napi::ArrayBuffer::New(
env, arr_ptr->data(), arr_ptr->size() * sizeof(T),
[](napi_env, void *, void *hint) { delete static_cast<T *>(hint); },
arr_ptr);
return Napi::TypedArrayOf<E>::New(env, arr_ptr->size(), buf, 0, type);
}
};
template <typename E>
struct ValueTransformer<E,
std::enable_if_t<std::is_base_of_v<naah::Error, E>>> {
public:
static Napi::Value ToJS(Napi::Env env, E e) {
return E::JSError::New(env, e.Message()).Value();
}
};
namespace details {
template <typename T>
class TSFNContainer;
template <typename... Args>
class TSFNContainer<std::function<void(Args...)>> {
public:
NAPI_DISALLOW_ASSIGN_COPY(TSFNContainer)
TSFNContainer(Napi::Function fun)
: _tsfn(TSFN::New(fun.Env(), fun, "naah::details::TSFNContainer", 0, 1)) {
}
~TSFNContainer() { _tsfn.Release(); }
static std::function<void(Args...)> Create(Napi::Function fun) {
return [tsfn = std::make_shared<TSFNContainer>(fun)](Args... args) {
tsfn->Call(std::move(args)...);
};
}
private:
using Tuple = std::tuple<Args...>;
void Call(Args &&...args) {
std::unique_ptr<Tuple> t =
std::make_unique<Tuple>(std::forward<Args>(args)...);
if (_tsfn.NonBlockingCall(t.get()) == napi_ok) {
t.release();
}
}
static void CallJS(Napi::Env env, Napi::Function fun, std::nullptr_t *,
Tuple *_data) {
std::unique_ptr<Tuple> t(_data); // RAII
std::vector<napi_value> args =
ValueTransformer<Tuple>::ToVector(env, std::move(*t));
#ifdef NAPI_CPP_EXCEPTIONS
try {
fun.Call(args);
} catch (const Napi::Error &e) {
napi_fatal_exception(env, e.Value());
}
#else
Napi::Value result = fun.Call(args);
if (result.IsEmpty()) {
Napi::Error e = env.GetAndClearPendingException();
napi_fatal_exception(env, e.Value());
}
#endif
}
using TSFN = Napi::TypedThreadSafeFunction<std::nullptr_t, Tuple, CallJS>;
TSFN _tsfn;
};
template <typename T, typename Enable = void>
struct is_std_function : std::false_type {};
template <typename Ret, typename... Args>
struct is_std_function<std::function<Ret(Args...)>> : std::true_type {};
class Invoker {
private:
template <typename Ret, typename Callable>
static Ret CallInternal(const Napi::CallbackInfo &info, Callable &&fn) {}
template <typename Ret>
static Napi::Value ToJS(const Napi::CallbackInfo &info, Ret ret) {
if constexpr (details::is_result<Ret>::value) {
using T = typename result_type<Ret>::T;
using E = typename result_type<Ret>::E;
if (ret.value.has_value()) {
return ValueTransformer<T>::ToJS(info.Env(), std::move(*ret.value));
} else {
E::JSError::New(info.Env(), (*ret.error).Message())
.ThrowAsJavaScriptException();
return info.Env().Undefined();
}
} else {
return ValueTransformer<Ret>::ToJS(info.Env(), std::move(ret));
}
}
template <typename Callable>
static auto WrapCallback([[maybe_unused]] const Napi::CallbackInfo &info,
Callable fn) {
#ifdef NAPI_CPP_EXCEPTIONS
try {
return fn();
} catch (const RangeError &err) {
throw RangeError::JSError::New(info.Env(), err.Message());
} catch (const TypeError &err) {
throw TypeError::JSError::New(info.Env(), err.Message());
} catch (const Error &err) {
throw Error::JSError::New(info.Env(), err.Message());
}
#else
return fn();
#endif
}
template <typename Callable>
static auto CallInternal(const Napi::CallbackInfo &info, Callable &&fn) {
using Signature = get_signature<std::decay_t<Callable>>;
using OriginArgs = typename Signature::args;
constexpr bool head_is_cb_info =
std::is_same_v<typename get_tuple_elements<OriginArgs>::head,
const Napi::CallbackInfo &>;
using Args = typename std::conditional_t<
head_is_cb_info, typename get_tuple_elements<OriginArgs>::rest,
OriginArgs>;
std::optional<Args> args = ArgsConverter<Args>::Get(info, 0);
if (!args.has_value()) {
NAPI_THROW(Napi::TypeError::New(info.Env(), "bad arguments"),
typename Signature::ret());
}
if constexpr (head_is_cb_info) {
return std::apply(
std::forward<Callable>(fn),
std::tuple_cat(std::make_tuple(std::cref(info)), std::move(*args)));
} else {
return std::apply(std::forward<Callable>(fn), std::move(*args));
}
}
template <typename Callable>
static auto CallJSInternal(const Napi::CallbackInfo &info, Callable &&fn) {
using Signature = get_signature<std::decay_t<Callable>>;
using OriginArgs = typename Signature::args;
using Ret = typename Signature::ret;
constexpr bool ret_is_void = std::is_void_v<Ret>;
constexpr bool head_is_cb_info =
std::is_same_v<typename get_tuple_elements<OriginArgs>::head,
const Napi::CallbackInfo &>;
using Args = typename std::conditional_t<
head_is_cb_info, typename get_tuple_elements<OriginArgs>::rest,
OriginArgs>;
std::optional<Args> args = ArgsConverter<Args>::Get(info, 0);
if (!args.has_value()) {
NAPI_THROW(Napi::TypeError::New(info.Env(), "bad arguments"),
typename std::conditional_t<ret_is_void, void, Napi::Value>());
}
if constexpr (head_is_cb_info) {
if constexpr (ret_is_void) {
return std::apply(
std::forward<Callable>(fn),
std::tuple_cat(std::make_tuple(std::cref(info)), std::move(*args)));
} else {
return ToJS<Ret>(
info, std::apply(std::forward<Callable>(fn),
std::tuple_cat(std::make_tuple(std::cref(info)),
std::move(*args))));
}
} else {
if constexpr (ret_is_void) {
return std::apply(std::forward<Callable>(fn), std::move(*args));
} else {
return ToJS<Ret>(
info, std::apply(std::forward<Callable>(fn), std::move(*args)));
}
}
}
public:
template <typename Callable>
static auto Call(const Napi::CallbackInfo &info, Callable &&fn) {
return WrapCallback(
info, [&] { return CallInternal(info, std::forward<Callable>(fn)); });
}
template <typename Callable>
static auto CallJS(const Napi::CallbackInfo &info, Callable &&fn) {
return WrapCallback(
info, [&] { return CallJSInternal(info, std::forward<Callable>(fn)); });
}
template <auto fn>
static auto FunctionCallback(const Napi::CallbackInfo &info) {
return CallJS(info, fn);
}
template <class T, typename Ret, typename... Args>
static auto InstanceCall(T *c, Ret (T::*m)(Args...)) {
return [=](Args... args) -> Ret { return (c->*m)(std::move(args)...); };
}
template <class T, typename Ret, typename... Args>
static auto InstanceCall(T *c, Ret (T::*m)(Args...) const) {
return [=](Args... args) -> Ret { return (c->*m)(std::move(args)...); };
}
};
class Function {
public:
template <auto fn>
static Napi::Function New(Napi::Env env, const char *utf8name = nullptr,
void *data = nullptr);
template <auto fn>
static Napi::Function New(Napi::Env env, const std::string &utf8name,
void *data = nullptr);
template <typename Callable>
static Napi::Function New(Napi::Env env, Callable fn,
const char *utf8name = nullptr,
void *data = nullptr);
template <typename Callable>
static Napi::Function New(Napi::Env env, Callable fn,
const std::string &utf8name, void *data = nullptr);
};
template <auto fn>
inline Napi::Function Function::New(Napi::Env env, const char *utf8name,
void *data) {
return Napi::Function::New<details::Invoker::FunctionCallback<fn>>(
env, utf8name, data);
}
template <auto fn>
inline Napi::Function Function::New(Napi::Env env, const std::string &utf8name,
void *data) {
return New<fn>(env, utf8name.c_str(), data);
}
template <typename Callable>
inline Napi::Function Function::New(Napi::Env env, Callable fn,
const char *utf8name, void *data) {
return Napi::Function::New(
env,
[fn = std::move(fn)](const Napi::CallbackInfo &info) -> auto {
return details::Invoker::CallJS(info, fn);
},
utf8name, data);
}
template <typename Callable>
inline Napi::Function Function::New(Napi::Env env, Callable fn,
const std::string &utf8name, void *data) {
return New(env, fn, utf8name.c_str(), data);
}
} // namespace details
template <typename Callable>
struct ValueTransformer<
Callable,
std::enable_if_t<
std::is_function_v<std::remove_pointer_t<Callable>> ||
std::is_member_function_pointer_v<decltype(&Callable::operator())>>> {
static std::optional<Callable> FromJS(Napi::Value value) {
static_assert(details::is_std_function<Callable>::value,
"arguments fn can only be std::function<void(Args...)>");
if (!value.IsFunction()) {
return {};
}
Napi::Function fun = value.As<Napi::Function>();
return details::TSFNContainer<Callable>::Create(fun);
}
static Napi::Value ToJS(Napi::Env env, Callable v) {
return details::Function::New(env, std::move(v));
}
};
template <typename Ret>
template <typename Arg>
inline AsyncWork<Ret>::AsyncWork(Arg &&arg) : task(std::forward<Arg>(arg)) {}
template <typename T, typename E>
inline Result<T, E>::Result(T t) : value(std::move(t)) {}
template <typename T, typename E>
inline Result<T, E>::Result(E e) : error(std::move(e)) {}
namespace details {
class AsyncWorkWorker : public Napi::AsyncWorker {
public:
AsyncWorkWorker(Napi::Env env, AsyncWork<void> task)
: Napi::AsyncWorker(env), _task(std::move(task)) {}
~AsyncWorkWorker() {}
void Execute() override { _task.task(); }
private:
AsyncWork<void> _task;
};
template <typename T>
class PromiseAsyncWorker : public Napi::AsyncWorker {
public:
PromiseAsyncWorker(Napi::Env env, AsyncWork<T> task)
: Napi::AsyncWorker(env), _task(std::move(task)), _deferred(env) {}
~PromiseAsyncWorker() {}
Napi::Promise Promise() { return _deferred.Promise(); }
void Execute() override { _result = _task.task(); }
void OnOK() override {
if (_result.has_value()) {
if constexpr (is_result<T>::value) {
using Resolve = typename result_type<T>::T;
using Reject = typename result_type<T>::E;
auto &promise_result = _result.value();
if (promise_result.value.has_value()) {
_deferred.Resolve(ValueTransformer<Resolve>::ToJS(
Env(), std::move(*promise_result.value)));
} else {
if constexpr (!std::is_same_v<Reject, std::nullptr_t>) {
if (_result.value().error.has_value()) {
_deferred.Reject(ValueTransformer<Reject>::ToJS(
Env(), std::move(*promise_result.error)));
}
}
}
} else {
_deferred.Resolve(
ValueTransformer<T>::ToJS(Env(), std::move(*_result)));
}
}
}
private:
AsyncWork<T> _task;
std::optional<T> _result;