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napi-inl.h
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napi-inl.h
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#ifndef SRC_NAPI_INL_H_
#define SRC_NAPI_INL_H_
////////////////////////////////////////////////////////////////////////////////
// N-API C++ Wrapper Classes
//
// Inline header-only implementations for "N-API" ABI-stable C APIs for Node.js.
////////////////////////////////////////////////////////////////////////////////
// Note: Do not include this file directly! Include "napi.h" instead.
#include <algorithm>
#include <cstring>
#include <mutex>
#include <type_traits>
namespace Napi {
// Helpers to handle functions exposed from C++.
namespace details {
// Attach a data item to an object and delete it when the object gets
// garbage-collected.
// TODO: Replace this code with `napi_add_finalizer()` whenever it becomes
// available on all supported versions of Node.js.
template <typename FreeType>
static inline napi_status AttachData(napi_env env,
napi_value obj,
FreeType* data,
napi_finalize finalizer = nullptr,
void* hint = nullptr) {
napi_status status;
if (finalizer == nullptr) {
finalizer = [](napi_env /*env*/, void* data, void* /*hint*/) {
delete static_cast<FreeType*>(data);
};
}
#if (NAPI_VERSION < 5)
napi_value symbol, external;
status = napi_create_symbol(env, nullptr, &symbol);
if (status == napi_ok) {
status = napi_create_external(env,
data,
finalizer,
hint,
&external);
if (status == napi_ok) {
napi_property_descriptor desc = {
nullptr,
symbol,
nullptr,
nullptr,
nullptr,
external,
napi_default,
nullptr
};
status = napi_define_properties(env, obj, 1, &desc);
}
}
#else // NAPI_VERSION >= 5
status = napi_add_finalizer(env, obj, data, finalizer, hint, nullptr);
#endif
return status;
}
// For use in JS to C++ callback wrappers to catch any Napi::Error exceptions
// and rethrow them as JavaScript exceptions before returning from the callback.
template <typename Callable>
inline napi_value WrapCallback(Callable callback) {
#ifdef NAPI_CPP_EXCEPTIONS
try {
return callback();
} catch (const Error& e) {
e.ThrowAsJavaScriptException();
return nullptr;
}
#else // NAPI_CPP_EXCEPTIONS
// When C++ exceptions are disabled, errors are immediately thrown as JS
// exceptions, so there is no need to catch and rethrow them here.
return callback();
#endif // NAPI_CPP_EXCEPTIONS
}
template <typename Callable, typename Return>
struct CallbackData {
static inline
napi_value Wrapper(napi_env env, napi_callback_info info) {
return details::WrapCallback([&] {
CallbackInfo callbackInfo(env, info);
CallbackData* callbackData =
static_cast<CallbackData*>(callbackInfo.Data());
callbackInfo.SetData(callbackData->data);
return callbackData->callback(callbackInfo);
});
}
Callable callback;
void* data;
};
template <typename Callable>
struct CallbackData<Callable, void> {
static inline
napi_value Wrapper(napi_env env, napi_callback_info info) {
return details::WrapCallback([&] {
CallbackInfo callbackInfo(env, info);
CallbackData* callbackData =
static_cast<CallbackData*>(callbackInfo.Data());
callbackInfo.SetData(callbackData->data);
callbackData->callback(callbackInfo);
return nullptr;
});
}
Callable callback;
void* data;
};
template <typename T, typename Finalizer, typename Hint = void>
struct FinalizeData {
static inline
void Wrapper(napi_env env, void* data, void* finalizeHint) {
FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
finalizeData->callback(Env(env), static_cast<T*>(data));
delete finalizeData;
}
static inline
void WrapperWithHint(napi_env env, void* data, void* finalizeHint) {
FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
finalizeData->callback(Env(env), static_cast<T*>(data), finalizeData->hint);
delete finalizeData;
}
Finalizer callback;
Hint* hint;
};
#if (NAPI_VERSION > 3)
template <typename ContextType=void,
typename Finalizer=std::function<void(Env, void*, ContextType*)>,
typename FinalizerDataType=void>
struct ThreadSafeFinalize {
static inline
void Wrapper(napi_env env, void* rawFinalizeData, void* /* rawContext */) {
if (rawFinalizeData == nullptr)
return;
ThreadSafeFinalize* finalizeData =
static_cast<ThreadSafeFinalize*>(rawFinalizeData);
finalizeData->callback(Env(env));
delete finalizeData;
}
static inline
void FinalizeWrapperWithData(napi_env env,
void* rawFinalizeData,
void* /* rawContext */) {
if (rawFinalizeData == nullptr)
return;
ThreadSafeFinalize* finalizeData =
static_cast<ThreadSafeFinalize*>(rawFinalizeData);
finalizeData->callback(Env(env), finalizeData->data);
delete finalizeData;
}
static inline
void FinalizeWrapperWithContext(napi_env env,
void* rawFinalizeData,
void* rawContext) {
if (rawFinalizeData == nullptr)
return;
ThreadSafeFinalize* finalizeData =
static_cast<ThreadSafeFinalize*>(rawFinalizeData);
finalizeData->callback(Env(env), static_cast<ContextType*>(rawContext));
delete finalizeData;
}
static inline
void FinalizeFinalizeWrapperWithDataAndContext(napi_env env,
void* rawFinalizeData,
void* rawContext) {
if (rawFinalizeData == nullptr)
return;
ThreadSafeFinalize* finalizeData =
static_cast<ThreadSafeFinalize*>(rawFinalizeData);
finalizeData->callback(Env(env), finalizeData->data,
static_cast<ContextType*>(rawContext));
delete finalizeData;
}
FinalizerDataType* data;
Finalizer callback;
};
#endif
template <typename Getter, typename Setter>
struct AccessorCallbackData {
static inline
napi_value GetterWrapper(napi_env env, napi_callback_info info) {
return details::WrapCallback([&] {
CallbackInfo callbackInfo(env, info);
AccessorCallbackData* callbackData =
static_cast<AccessorCallbackData*>(callbackInfo.Data());
callbackInfo.SetData(callbackData->data);
return callbackData->getterCallback(callbackInfo);
});
}
static inline
napi_value SetterWrapper(napi_env env, napi_callback_info info) {
return details::WrapCallback([&] {
CallbackInfo callbackInfo(env, info);
AccessorCallbackData* callbackData =
static_cast<AccessorCallbackData*>(callbackInfo.Data());
callbackInfo.SetData(callbackData->data);
callbackData->setterCallback(callbackInfo);
return nullptr;
});
}
Getter getterCallback;
Setter setterCallback;
void* data;
};
} // namespace details
#ifndef NODE_ADDON_API_DISABLE_DEPRECATED
# include "napi-inl.deprecated.h"
#endif // !NODE_ADDON_API_DISABLE_DEPRECATED
////////////////////////////////////////////////////////////////////////////////
// Module registration
////////////////////////////////////////////////////////////////////////////////
#define NODE_API_MODULE(modname, regfunc) \
napi_value __napi_ ## regfunc(napi_env env, \
napi_value exports) { \
return Napi::RegisterModule(env, exports, regfunc); \
} \
NAPI_MODULE(modname, __napi_ ## regfunc)
// Adapt the NAPI_MODULE registration function:
// - Wrap the arguments in NAPI wrappers.
// - Catch any NAPI errors and rethrow as JS exceptions.
inline napi_value RegisterModule(napi_env env,
napi_value exports,
ModuleRegisterCallback registerCallback) {
return details::WrapCallback([&] {
return napi_value(registerCallback(Napi::Env(env),
Napi::Object(env, exports)));
});
}
////////////////////////////////////////////////////////////////////////////////
// Env class
////////////////////////////////////////////////////////////////////////////////
inline Env::Env(napi_env env) : _env(env) {
}
inline Env::operator napi_env() const {
return _env;
}
inline Object Env::Global() const {
napi_value value;
napi_status status = napi_get_global(*this, &value);
NAPI_THROW_IF_FAILED(*this, status, Object());
return Object(*this, value);
}
inline Value Env::Undefined() const {
napi_value value;
napi_status status = napi_get_undefined(*this, &value);
NAPI_THROW_IF_FAILED(*this, status, Value());
return Value(*this, value);
}
inline Value Env::Null() const {
napi_value value;
napi_status status = napi_get_null(*this, &value);
NAPI_THROW_IF_FAILED(*this, status, Value());
return Value(*this, value);
}
inline bool Env::IsExceptionPending() const {
bool result;
napi_status status = napi_is_exception_pending(_env, &result);
if (status != napi_ok) result = false; // Checking for a pending exception shouldn't throw.
return result;
}
inline Error Env::GetAndClearPendingException() {
napi_value value;
napi_status status = napi_get_and_clear_last_exception(_env, &value);
if (status != napi_ok) {
// Don't throw another exception when failing to get the exception!
return Error();
}
return Error(_env, value);
}
inline Value Env::RunScript(const char* utf8script) {
String script = String::New(_env, utf8script);
return RunScript(script);
}
inline Value Env::RunScript(const std::string& utf8script) {
return RunScript(utf8script.c_str());
}
inline Value Env::RunScript(String script) {
napi_value result;
napi_status status = napi_run_script(_env, script, &result);
NAPI_THROW_IF_FAILED(_env, status, Undefined());
return Value(_env, result);
}
#if NAPI_VERSION > 5
template <typename T, Env::Finalizer<T> fini>
inline void Env::SetInstanceData(T* data) {
napi_status status =
napi_set_instance_data(_env, data, [](napi_env env, void* data, void*) {
fini(env, static_cast<T*>(data));
}, nullptr);
NAPI_THROW_IF_FAILED_VOID(_env, status);
}
template <typename DataType,
typename HintType,
Napi::Env::FinalizerWithHint<DataType, HintType> fini>
inline void Env::SetInstanceData(DataType* data, HintType* hint) {
napi_status status =
napi_set_instance_data(_env, data,
[](napi_env env, void* data, void* hint) {
fini(env, static_cast<DataType*>(data), static_cast<HintType*>(hint));
}, hint);
NAPI_THROW_IF_FAILED_VOID(_env, status);
}
template <typename T>
inline T* Env::GetInstanceData() {
void* data = nullptr;
napi_status status = napi_get_instance_data(_env, &data);
NAPI_THROW_IF_FAILED(_env, status, nullptr);
return static_cast<T*>(data);
}
template <typename T> void Env::DefaultFini(Env, T* data) {
delete data;
}
template <typename DataType, typename HintType>
void Env::DefaultFiniWithHint(Env, DataType* data, HintType*) {
delete data;
}
#endif // NAPI_VERSION > 5
////////////////////////////////////////////////////////////////////////////////
// Value class
////////////////////////////////////////////////////////////////////////////////
inline Value::Value() : _env(nullptr), _value(nullptr) {
}
inline Value::Value(napi_env env, napi_value value) : _env(env), _value(value) {
}
inline Value::operator napi_value() const {
return _value;
}
inline bool Value::operator ==(const Value& other) const {
return StrictEquals(other);
}
inline bool Value::operator !=(const Value& other) const {
return !this->operator ==(other);
}
inline bool Value::StrictEquals(const Value& other) const {
bool result;
napi_status status = napi_strict_equals(_env, *this, other, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline Napi::Env Value::Env() const {
return Napi::Env(_env);
}
inline bool Value::IsEmpty() const {
return _value == nullptr;
}
inline napi_valuetype Value::Type() const {
if (IsEmpty()) {
return napi_undefined;
}
napi_valuetype type;
napi_status status = napi_typeof(_env, _value, &type);
NAPI_THROW_IF_FAILED(_env, status, napi_undefined);
return type;
}
inline bool Value::IsUndefined() const {
return Type() == napi_undefined;
}
inline bool Value::IsNull() const {
return Type() == napi_null;
}
inline bool Value::IsBoolean() const {
return Type() == napi_boolean;
}
inline bool Value::IsNumber() const {
return Type() == napi_number;
}
#if NAPI_VERSION > 5
inline bool Value::IsBigInt() const {
return Type() == napi_bigint;
}
#endif // NAPI_VERSION > 5
#if (NAPI_VERSION > 4)
inline bool Value::IsDate() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_date(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
#endif
inline bool Value::IsString() const {
return Type() == napi_string;
}
inline bool Value::IsSymbol() const {
return Type() == napi_symbol;
}
inline bool Value::IsArray() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_array(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsArrayBuffer() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_arraybuffer(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsTypedArray() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_typedarray(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsObject() const {
return Type() == napi_object || IsFunction();
}
inline bool Value::IsFunction() const {
return Type() == napi_function;
}
inline bool Value::IsPromise() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_promise(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsDataView() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_dataview(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsBuffer() const {
if (IsEmpty()) {
return false;
}
bool result;
napi_status status = napi_is_buffer(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
inline bool Value::IsExternal() const {
return Type() == napi_external;
}
template <typename T>
inline T Value::As() const {
return T(_env, _value);
}
inline Boolean Value::ToBoolean() const {
napi_value result;
napi_status status = napi_coerce_to_bool(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, Boolean());
return Boolean(_env, result);
}
inline Number Value::ToNumber() const {
napi_value result;
napi_status status = napi_coerce_to_number(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, Number());
return Number(_env, result);
}
inline String Value::ToString() const {
napi_value result;
napi_status status = napi_coerce_to_string(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, String());
return String(_env, result);
}
inline Object Value::ToObject() const {
napi_value result;
napi_status status = napi_coerce_to_object(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, Object());
return Object(_env, result);
}
////////////////////////////////////////////////////////////////////////////////
// Boolean class
////////////////////////////////////////////////////////////////////////////////
inline Boolean Boolean::New(napi_env env, bool val) {
napi_value value;
napi_status status = napi_get_boolean(env, val, &value);
NAPI_THROW_IF_FAILED(env, status, Boolean());
return Boolean(env, value);
}
inline Boolean::Boolean() : Napi::Value() {
}
inline Boolean::Boolean(napi_env env, napi_value value) : Napi::Value(env, value) {
}
inline Boolean::operator bool() const {
return Value();
}
inline bool Boolean::Value() const {
bool result;
napi_status status = napi_get_value_bool(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, false);
return result;
}
////////////////////////////////////////////////////////////////////////////////
// Number class
////////////////////////////////////////////////////////////////////////////////
inline Number Number::New(napi_env env, double val) {
napi_value value;
napi_status status = napi_create_double(env, val, &value);
NAPI_THROW_IF_FAILED(env, status, Number());
return Number(env, value);
}
inline Number::Number() : Value() {
}
inline Number::Number(napi_env env, napi_value value) : Value(env, value) {
}
inline Number::operator int32_t() const {
return Int32Value();
}
inline Number::operator uint32_t() const {
return Uint32Value();
}
inline Number::operator int64_t() const {
return Int64Value();
}
inline Number::operator float() const {
return FloatValue();
}
inline Number::operator double() const {
return DoubleValue();
}
inline int32_t Number::Int32Value() const {
int32_t result;
napi_status status = napi_get_value_int32(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
inline uint32_t Number::Uint32Value() const {
uint32_t result;
napi_status status = napi_get_value_uint32(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
inline int64_t Number::Int64Value() const {
int64_t result;
napi_status status = napi_get_value_int64(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
inline float Number::FloatValue() const {
return static_cast<float>(DoubleValue());
}
inline double Number::DoubleValue() const {
double result;
napi_status status = napi_get_value_double(_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
#if NAPI_VERSION > 5
////////////////////////////////////////////////////////////////////////////////
// BigInt Class
////////////////////////////////////////////////////////////////////////////////
inline BigInt BigInt::New(napi_env env, int64_t val) {
napi_value value;
napi_status status = napi_create_bigint_int64(env, val, &value);
NAPI_THROW_IF_FAILED(env, status, BigInt());
return BigInt(env, value);
}
inline BigInt BigInt::New(napi_env env, uint64_t val) {
napi_value value;
napi_status status = napi_create_bigint_uint64(env, val, &value);
NAPI_THROW_IF_FAILED(env, status, BigInt());
return BigInt(env, value);
}
inline BigInt BigInt::New(napi_env env, int sign_bit, size_t word_count, const uint64_t* words) {
napi_value value;
napi_status status = napi_create_bigint_words(env, sign_bit, word_count, words, &value);
NAPI_THROW_IF_FAILED(env, status, BigInt());
return BigInt(env, value);
}
inline BigInt::BigInt() : Value() {
}
inline BigInt::BigInt(napi_env env, napi_value value) : Value(env, value) {
}
inline int64_t BigInt::Int64Value(bool* lossless) const {
int64_t result;
napi_status status = napi_get_value_bigint_int64(
_env, _value, &result, lossless);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
inline uint64_t BigInt::Uint64Value(bool* lossless) const {
uint64_t result;
napi_status status = napi_get_value_bigint_uint64(
_env, _value, &result, lossless);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
inline size_t BigInt::WordCount() const {
size_t word_count;
napi_status status = napi_get_value_bigint_words(
_env, _value, nullptr, &word_count, nullptr);
NAPI_THROW_IF_FAILED(_env, status, 0);
return word_count;
}
inline void BigInt::ToWords(int* sign_bit, size_t* word_count, uint64_t* words) {
napi_status status = napi_get_value_bigint_words(
_env, _value, sign_bit, word_count, words);
NAPI_THROW_IF_FAILED_VOID(_env, status);
}
#endif // NAPI_VERSION > 5
#if (NAPI_VERSION > 4)
////////////////////////////////////////////////////////////////////////////////
// Date Class
////////////////////////////////////////////////////////////////////////////////
inline Date Date::New(napi_env env, double val) {
napi_value value;
napi_status status = napi_create_date(env, val, &value);
NAPI_THROW_IF_FAILED(env, status, Date());
return Date(env, value);
}
inline Date::Date() : Value() {
}
inline Date::Date(napi_env env, napi_value value) : Value(env, value) {
}
inline Date::operator double() const {
return ValueOf();
}
inline double Date::ValueOf() const {
double result;
napi_status status = napi_get_date_value(
_env, _value, &result);
NAPI_THROW_IF_FAILED(_env, status, 0);
return result;
}
#endif
////////////////////////////////////////////////////////////////////////////////
// Name class
////////////////////////////////////////////////////////////////////////////////
inline Name::Name() : Value() {
}
inline Name::Name(napi_env env, napi_value value) : Value(env, value) {
}
////////////////////////////////////////////////////////////////////////////////
// String class
////////////////////////////////////////////////////////////////////////////////
inline String String::New(napi_env env, const std::string& val) {
return String::New(env, val.c_str(), val.size());
}
inline String String::New(napi_env env, const std::u16string& val) {
return String::New(env, val.c_str(), val.size());
}
inline String String::New(napi_env env, const char* val) {
napi_value value;
napi_status status = napi_create_string_utf8(env, val, std::strlen(val), &value);
NAPI_THROW_IF_FAILED(env, status, String());
return String(env, value);
}
inline String String::New(napi_env env, const char16_t* val) {
napi_value value;
napi_status status = napi_create_string_utf16(env, val, std::u16string(val).size(), &value);
NAPI_THROW_IF_FAILED(env, status, String());
return String(env, value);
}
inline String String::New(napi_env env, const char* val, size_t length) {
napi_value value;
napi_status status = napi_create_string_utf8(env, val, length, &value);
NAPI_THROW_IF_FAILED(env, status, String());
return String(env, value);
}
inline String String::New(napi_env env, const char16_t* val, size_t length) {
napi_value value;
napi_status status = napi_create_string_utf16(env, val, length, &value);
NAPI_THROW_IF_FAILED(env, status, String());
return String(env, value);
}
inline String::String() : Name() {
}
inline String::String(napi_env env, napi_value value) : Name(env, value) {
}
inline String::operator std::string() const {
return Utf8Value();
}
inline String::operator std::u16string() const {
return Utf16Value();
}
inline std::string String::Utf8Value() const {
size_t length;
napi_status status = napi_get_value_string_utf8(_env, _value, nullptr, 0, &length);
NAPI_THROW_IF_FAILED(_env, status, "");
std::string value;
value.reserve(length + 1);
value.resize(length);
status = napi_get_value_string_utf8(_env, _value, &value[0], value.capacity(), nullptr);
NAPI_THROW_IF_FAILED(_env, status, "");
return value;
}
inline std::u16string String::Utf16Value() const {
size_t length;
napi_status status = napi_get_value_string_utf16(_env, _value, nullptr, 0, &length);
NAPI_THROW_IF_FAILED(_env, status, NAPI_WIDE_TEXT(""));
std::u16string value;
value.reserve(length + 1);
value.resize(length);
status = napi_get_value_string_utf16(_env, _value, &value[0], value.capacity(), nullptr);
NAPI_THROW_IF_FAILED(_env, status, NAPI_WIDE_TEXT(""));
return value;
}
////////////////////////////////////////////////////////////////////////////////
// Symbol class
////////////////////////////////////////////////////////////////////////////////
inline Symbol Symbol::New(napi_env env, const char* description) {
napi_value descriptionValue = description != nullptr ?
String::New(env, description) : static_cast<napi_value>(nullptr);
return Symbol::New(env, descriptionValue);
}
inline Symbol Symbol::New(napi_env env, const std::string& description) {
napi_value descriptionValue = String::New(env, description);
return Symbol::New(env, descriptionValue);
}
inline Symbol Symbol::New(napi_env env, String description) {
napi_value descriptionValue = description;
return Symbol::New(env, descriptionValue);
}
inline Symbol Symbol::New(napi_env env, napi_value description) {
napi_value value;
napi_status status = napi_create_symbol(env, description, &value);
NAPI_THROW_IF_FAILED(env, status, Symbol());
return Symbol(env, value);
}
inline Symbol Symbol::WellKnown(napi_env env, const std::string& name) {
return Napi::Env(env).Global().Get("Symbol").As<Object>().Get(name).As<Symbol>();
}
inline Symbol::Symbol() : Name() {
}
inline Symbol::Symbol(napi_env env, napi_value value) : Name(env, value) {
}
////////////////////////////////////////////////////////////////////////////////
// Automagic value creation
////////////////////////////////////////////////////////////////////////////////
namespace details {
template <typename T>
struct vf_number {
static Number From(napi_env env, T value) {
return Number::New(env, static_cast<double>(value));
}
};
template<>
struct vf_number<bool> {
static Boolean From(napi_env env, bool value) {
return Boolean::New(env, value);
}
};
struct vf_utf8_charp {
static String From(napi_env env, const char* value) {
return String::New(env, value);
}
};
struct vf_utf16_charp {
static String From(napi_env env, const char16_t* value) {
return String::New(env, value);
}
};
struct vf_utf8_string {
static String From(napi_env env, const std::string& value) {
return String::New(env, value);
}
};
struct vf_utf16_string {
static String From(napi_env env, const std::u16string& value) {
return String::New(env, value);
}
};
template <typename T>
struct vf_fallback {
static Value From(napi_env env, const T& value) {
return Value(env, value);
}
};
template <typename...> struct disjunction : std::false_type {};
template <typename B> struct disjunction<B> : B {};
template <typename B, typename... Bs>
struct disjunction<B, Bs...>
: std::conditional<bool(B::value), B, disjunction<Bs...>>::type {};
template <typename T>
struct can_make_string
: disjunction<typename std::is_convertible<T, const char *>::type,
typename std::is_convertible<T, const char16_t *>::type,
typename std::is_convertible<T, std::string>::type,
typename std::is_convertible<T, std::u16string>::type> {};
}
template <typename T>
Value Value::From(napi_env env, const T& value) {
using Helper = typename std::conditional<
std::is_integral<T>::value || std::is_floating_point<T>::value,
details::vf_number<T>,
typename std::conditional<
details::can_make_string<T>::value,
String,
details::vf_fallback<T>
>::type
>::type;
return Helper::From(env, value);
}
template <typename T>
String String::From(napi_env env, const T& value) {
struct Dummy {};
using Helper = typename std::conditional<
std::is_convertible<T, const char*>::value,
details::vf_utf8_charp,
typename std::conditional<
std::is_convertible<T, const char16_t*>::value,
details::vf_utf16_charp,
typename std::conditional<
std::is_convertible<T, std::string>::value,
details::vf_utf8_string,
typename std::conditional<
std::is_convertible<T, std::u16string>::value,
details::vf_utf16_string,
Dummy
>::type
>::type
>::type
>::type;
return Helper::From(env, value);
}
////////////////////////////////////////////////////////////////////////////////
// Object class
////////////////////////////////////////////////////////////////////////////////
template <typename Key>
inline Object::PropertyLValue<Key>::operator Value() const {
return Object(_env, _object).Get(_key);
}
template <typename Key> template <typename ValueType>
inline Object::PropertyLValue<Key>& Object::PropertyLValue<Key>::operator =(ValueType value) {
Object(_env, _object).Set(_key, value);
return *this;
}