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travel/admin/node_modules/node-addon-api/napi.h

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2024-06-24 11:28:18 +08:00
#ifndef SRC_NAPI_H_
#define SRC_NAPI_H_
#include <node_api.h>
#include <functional>
#include <initializer_list>
#include <memory>
#include <string>
#include <vector>
// VS2015 RTM has bugs with constexpr, so require min of VS2015 Update 3 (known good version)
#if !defined(_MSC_VER) || _MSC_FULL_VER >= 190024210
#define NAPI_HAS_CONSTEXPR 1
#endif
// VS2013 does not support char16_t literal strings, so we'll work around it using wchar_t strings
// and casting them. This is safe as long as the character sizes are the same.
#if defined(_MSC_VER) && _MSC_VER <= 1800
static_assert(sizeof(char16_t) == sizeof(wchar_t), "Size mismatch between char16_t and wchar_t");
#define NAPI_WIDE_TEXT(x) reinterpret_cast<char16_t*>(L ## x)
#else
#define NAPI_WIDE_TEXT(x) u ## x
#endif
// If C++ exceptions are not explicitly enabled or disabled, enable them
// if exceptions were enabled in the compiler settings.
#if !defined(NAPI_CPP_EXCEPTIONS) && !defined(NAPI_DISABLE_CPP_EXCEPTIONS)
#if defined(_CPPUNWIND) || defined (__EXCEPTIONS)
#define NAPI_CPP_EXCEPTIONS
#else
#error Exception support not detected. \
Define either NAPI_CPP_EXCEPTIONS or NAPI_DISABLE_CPP_EXCEPTIONS.
#endif
#endif
#ifdef _NOEXCEPT
#define NAPI_NOEXCEPT _NOEXCEPT
#else
#define NAPI_NOEXCEPT noexcept
#endif
#ifdef NAPI_CPP_EXCEPTIONS
// When C++ exceptions are enabled, Errors are thrown directly. There is no need
// to return anything after the throw statements. The variadic parameter is an
// optional return value that is ignored.
// We need _VOID versions of the macros to avoid warnings resulting from
// leaving the NAPI_THROW_* `...` argument empty.
#define NAPI_THROW(e, ...) throw e
#define NAPI_THROW_VOID(e) throw e
#define NAPI_THROW_IF_FAILED(env, status, ...) \
if ((status) != napi_ok) throw Napi::Error::New(env);
#define NAPI_THROW_IF_FAILED_VOID(env, status) \
if ((status) != napi_ok) throw Napi::Error::New(env);
#else // NAPI_CPP_EXCEPTIONS
// When C++ exceptions are disabled, Errors are thrown as JavaScript exceptions,
// which are pending until the callback returns to JS. The variadic parameter
// is an optional return value; usually it is an empty result.
// We need _VOID versions of the macros to avoid warnings resulting from
// leaving the NAPI_THROW_* `...` argument empty.
#define NAPI_THROW(e, ...) \
do { \
(e).ThrowAsJavaScriptException(); \
return __VA_ARGS__; \
} while (0)
#define NAPI_THROW_VOID(e) \
do { \
(e).ThrowAsJavaScriptException(); \
return; \
} while (0)
#define NAPI_THROW_IF_FAILED(env, status, ...) \
if ((status) != napi_ok) { \
Napi::Error::New(env).ThrowAsJavaScriptException(); \
return __VA_ARGS__; \
}
#define NAPI_THROW_IF_FAILED_VOID(env, status) \
if ((status) != napi_ok) { \
Napi::Error::New(env).ThrowAsJavaScriptException(); \
return; \
}
#endif // NAPI_CPP_EXCEPTIONS
#define NAPI_FATAL_IF_FAILED(status, location, message) \
do { \
if ((status) != napi_ok) { \
Napi::Error::Fatal((location), (message)); \
} \
} while (0)
////////////////////////////////////////////////////////////////////////////////
/// N-API C++ Wrapper Classes
///
/// These classes wrap the "N-API" ABI-stable C APIs for Node.js, providing a
/// C++ object model and C++ exception-handling semantics with low overhead.
/// The wrappers are all header-only so that they do not affect the ABI.
////////////////////////////////////////////////////////////////////////////////
namespace Napi {
// Forward declarations
class Env;
class Value;
class Boolean;
class Number;
// currently experimental guard with version of NAPI_VERSION that it is
// released in once it is no longer experimental
#if (NAPI_VERSION > 2147483646)
class BigInt;
#endif // NAPI_EXPERIMENTAL
class String;
class Object;
class Array;
class Function;
template <typename T> class Buffer;
class Error;
class PropertyDescriptor;
class CallbackInfo;
template <typename T> class Reference;
class TypedArray;
template <typename T> class TypedArrayOf;
typedef TypedArrayOf<int8_t> Int8Array; ///< Typed-array of signed 8-bit integers
typedef TypedArrayOf<uint8_t> Uint8Array; ///< Typed-array of unsigned 8-bit integers
typedef TypedArrayOf<int16_t> Int16Array; ///< Typed-array of signed 16-bit integers
typedef TypedArrayOf<uint16_t> Uint16Array; ///< Typed-array of unsigned 16-bit integers
typedef TypedArrayOf<int32_t> Int32Array; ///< Typed-array of signed 32-bit integers
typedef TypedArrayOf<uint32_t> Uint32Array; ///< Typed-array of unsigned 32-bit integers
typedef TypedArrayOf<float> Float32Array; ///< Typed-array of 32-bit floating-point values
typedef TypedArrayOf<double> Float64Array; ///< Typed-array of 64-bit floating-point values
// currently experimental guard with version of NAPI_VERSION that it is
// released in once it is no longer experimental
#if (NAPI_VERSION > 2147483646)
typedef TypedArrayOf<int64_t> BigInt64Array; ///< Typed array of signed 64-bit integers
typedef TypedArrayOf<uint64_t> BigUint64Array; ///< Typed array of unsigned 64-bit integers
#endif // NAPI_EXPERIMENTAL
/// Defines the signature of a N-API C++ module's registration callback (init) function.
typedef Object (*ModuleRegisterCallback)(Env env, Object exports);
class MemoryManagement;
/// Environment for N-API values and operations.
///
/// All N-API values and operations must be associated with an environment. An environment
/// instance is always provided to callback functions; that environment must then be used for any
/// creation of N-API values or other N-API operations within the callback. (Many methods infer
/// the environment from the `this` instance that the method is called on.)
///
/// In the future, multiple environments per process may be supported, although current
/// implementations only support one environment per process.
///
/// In the V8 JavaScript engine, a N-API environment approximately corresponds to an Isolate.
class Env {
public:
Env(napi_env env);
operator napi_env() const;
Object Global() const;
Value Undefined() const;
Value Null() const;
bool IsExceptionPending() const;
Error GetAndClearPendingException();
private:
napi_env _env;
};
/// A JavaScript value of unknown type.
///
/// For type-specific operations, convert to one of the Value subclasses using a `To*` or `As()`
/// method. The `To*` methods do type coercion; the `As()` method does not.
///
/// Napi::Value value = ...
/// if (!value.IsString()) throw Napi::TypeError::New(env, "Invalid arg...");
/// Napi::String str = value.As<Napi::String>(); // Cast to a string value
///
/// Napi::Value anotherValue = ...
/// bool isTruthy = anotherValue.ToBoolean(); // Coerce to a boolean value
class Value {
public:
Value(); ///< Creates a new _empty_ Value instance.
Value(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
/// Creates a JS value from a C++ primitive.
///
/// `value` may be any of:
/// - bool
/// - Any integer type
/// - Any floating point type
/// - const char* (encoded using UTF-8, null-terminated)
/// - const char16_t* (encoded using UTF-16-LE, null-terminated)
/// - std::string (encoded using UTF-8)
/// - std::u16string
/// - napi::Value
/// - napi_value
template <typename T>
static Value From(napi_env env, const T& value);
/// Converts to a N-API value primitive.
///
/// If the instance is _empty_, this returns `nullptr`.
operator napi_value() const;
/// Tests if this value strictly equals another value.
bool operator ==(const Value& other) const;
/// Tests if this value does not strictly equal another value.
bool operator !=(const Value& other) const;
/// Tests if this value strictly equals another value.
bool StrictEquals(const Value& other) const;
/// Gets the environment the value is associated with.
Napi::Env Env() const;
/// Checks if the value is empty (uninitialized).
///
/// An empty value is invalid, and most attempts to perform an operation on an empty value
/// will result in an exception. Note an empty value is distinct from JavaScript `null` or
/// `undefined`, which are valid values.
///
/// When C++ exceptions are disabled at compile time, a method with a `Value` return type may
/// return an empty value to indicate a pending exception. So when not using C++ exceptions,
/// callers should check whether the value is empty before attempting to use it.
bool IsEmpty() const;
napi_valuetype Type() const; ///< Gets the type of the value.
bool IsUndefined() const; ///< Tests if a value is an undefined JavaScript value.
bool IsNull() const; ///< Tests if a value is a null JavaScript value.
bool IsBoolean() const; ///< Tests if a value is a JavaScript boolean.
bool IsNumber() const; ///< Tests if a value is a JavaScript number.
// currently experimental guard with version of NAPI_VERSION that it is
// released in once it is no longer experimental
#if (NAPI_VERSION > 2147483646)
bool IsBigInt() const; ///< Tests if a value is a JavaScript bigint.
#endif // NAPI_EXPERIMENTAL
bool IsString() const; ///< Tests if a value is a JavaScript string.
bool IsSymbol() const; ///< Tests if a value is a JavaScript symbol.
bool IsArray() const; ///< Tests if a value is a JavaScript array.
bool IsArrayBuffer() const; ///< Tests if a value is a JavaScript array buffer.
bool IsTypedArray() const; ///< Tests if a value is a JavaScript typed array.
bool IsObject() const; ///< Tests if a value is a JavaScript object.
bool IsFunction() const; ///< Tests if a value is a JavaScript function.
bool IsPromise() const; ///< Tests if a value is a JavaScript promise.
bool IsDataView() const; ///< Tests if a value is a JavaScript data view.
bool IsBuffer() const; ///< Tests if a value is a Node buffer.
bool IsExternal() const; ///< Tests if a value is a pointer to external data.
/// Casts to another type of `Napi::Value`, when the actual type is known or assumed.
///
/// This conversion does NOT coerce the type. Calling any methods inappropriate for the actual
/// value type will throw `Napi::Error`.
template <typename T> T As() const;
Boolean ToBoolean() const; ///< Coerces a value to a JavaScript boolean.
Number ToNumber() const; ///< Coerces a value to a JavaScript number.
String ToString() const; ///< Coerces a value to a JavaScript string.
Object ToObject() const; ///< Coerces a value to a JavaScript object.
protected:
/// !cond INTERNAL
napi_env _env;
napi_value _value;
/// !endcond
};
/// A JavaScript boolean value.
class Boolean : public Value {
public:
static Boolean New(
napi_env env, ///< N-API environment
bool value ///< Boolean value
);
Boolean(); ///< Creates a new _empty_ Boolean instance.
Boolean(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
operator bool() const; ///< Converts a Boolean value to a boolean primitive.
bool Value() const; ///< Converts a Boolean value to a boolean primitive.
};
/// A JavaScript number value.
class Number : public Value {
public:
static Number New(
napi_env env, ///< N-API environment
double value ///< Number value
);
Number(); ///< Creates a new _empty_ Number instance.
Number(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
operator int32_t() const; ///< Converts a Number value to a 32-bit signed integer value.
operator uint32_t() const; ///< Converts a Number value to a 32-bit unsigned integer value.
operator int64_t() const; ///< Converts a Number value to a 64-bit signed integer value.
operator float() const; ///< Converts a Number value to a 32-bit floating-point value.
operator double() const; ///< Converts a Number value to a 64-bit floating-point value.
int32_t Int32Value() const; ///< Converts a Number value to a 32-bit signed integer value.
uint32_t Uint32Value() const; ///< Converts a Number value to a 32-bit unsigned integer value.
int64_t Int64Value() const; ///< Converts a Number value to a 64-bit signed integer value.
float FloatValue() const; ///< Converts a Number value to a 32-bit floating-point value.
double DoubleValue() const; ///< Converts a Number value to a 64-bit floating-point value.
};
// currently experimental guard with version of NAPI_VERSION that it is
// released in once it is no longer experimental
#if (NAPI_VERSION > 2147483646)
/// A JavaScript bigint value.
class BigInt : public Value {
public:
static BigInt New(
napi_env env, ///< N-API environment
int64_t value ///< Number value
);
static BigInt New(
napi_env env, ///< N-API environment
uint64_t value ///< Number value
);
/// Creates a new BigInt object using a specified sign bit and a
/// specified list of digits/words.
/// The resulting number is calculated as:
/// (-1)^sign_bit * (words[0] * (2^64)^0 + words[1] * (2^64)^1 + ...)
static BigInt New(
napi_env env, ///< N-API environment
int sign_bit, ///< Sign bit. 1 if negative.
size_t word_count, ///< Number of words in array
const uint64_t* words ///< Array of words
);
BigInt(); ///< Creates a new _empty_ BigInt instance.
BigInt(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
int64_t Int64Value(bool* lossless) const; ///< Converts a BigInt value to a 64-bit signed integer value.
uint64_t Uint64Value(bool* lossless) const; ///< Converts a BigInt value to a 64-bit unsigned integer value.
size_t WordCount() const; ///< The number of 64-bit words needed to store the result of ToWords().
/// Writes the contents of this BigInt to a specified memory location.
/// `sign_bit` must be provided and will be set to 1 if this BigInt is negative.
/// `*word_count` has to be initialized to the length of the `words` array.
/// Upon return, it will be set to the actual number of words that would
/// be needed to store this BigInt (i.e. the return value of `WordCount()`).
void ToWords(int* sign_bit, size_t* word_count, uint64_t* words);
};
#endif // NAPI_EXPERIMENTAL
/// A JavaScript string or symbol value (that can be used as a property name).
class Name : public Value {
public:
Name(); ///< Creates a new _empty_ Name instance.
Name(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
};
/// A JavaScript string value.
class String : public Name {
public:
/// Creates a new String value from a UTF-8 encoded C++ string.
static String New(
napi_env env, ///< N-API environment
const std::string& value ///< UTF-8 encoded C++ string
);
/// Creates a new String value from a UTF-16 encoded C++ string.
static String New(
napi_env env, ///< N-API environment
const std::u16string& value ///< UTF-16 encoded C++ string
);
/// Creates a new String value from a UTF-8 encoded C string.
static String New(
napi_env env, ///< N-API environment
const char* value ///< UTF-8 encoded null-terminated C string
);
/// Creates a new String value from a UTF-16 encoded C string.
static String New(
napi_env env, ///< N-API environment
const char16_t* value ///< UTF-16 encoded null-terminated C string
);
/// Creates a new String value from a UTF-8 encoded C string with specified length.
static String New(
napi_env env, ///< N-API environment
const char* value, ///< UTF-8 encoded C string (not necessarily null-terminated)
size_t length ///< length of the string in bytes
);
/// Creates a new String value from a UTF-16 encoded C string with specified length.
static String New(
napi_env env, ///< N-API environment
const char16_t* value, ///< UTF-16 encoded C string (not necessarily null-terminated)
size_t length ///< Length of the string in 2-byte code units
);
/// Creates a new String based on the original object's type.
///
/// `value` may be any of:
/// - const char* (encoded using UTF-8, null-terminated)
/// - const char16_t* (encoded using UTF-16-LE, null-terminated)
/// - std::string (encoded using UTF-8)
/// - std::u16string
template <typename T>
static String From(napi_env env, const T& value);
String(); ///< Creates a new _empty_ String instance.
String(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
operator std::string() const; ///< Converts a String value to a UTF-8 encoded C++ string.
operator std::u16string() const; ///< Converts a String value to a UTF-16 encoded C++ string.
std::string Utf8Value() const; ///< Converts a String value to a UTF-8 encoded C++ string.
std::u16string Utf16Value() const; ///< Converts a String value to a UTF-16 encoded C++ string.
};
/// A JavaScript symbol value.
class Symbol : public Name {
public:
/// Creates a new Symbol value with an optional description.
static Symbol New(
napi_env env, ///< N-API environment
const char* description = nullptr ///< Optional UTF-8 encoded null-terminated C string
/// describing the symbol
);
/// Creates a new Symbol value with a description.
static Symbol New(
napi_env env, ///< N-API environment
const std::string& description ///< UTF-8 encoded C++ string describing the symbol
);
/// Creates a new Symbol value with a description.
static Symbol New(
napi_env env, ///< N-API environment
String description ///< String value describing the symbol
);
/// Creates a new Symbol value with a description.
static Symbol New(
napi_env env, ///< N-API environment
napi_value description ///< String value describing the symbol
);
/// Get a public Symbol (e.g. Symbol.iterator).
static Symbol WellKnown(napi_env, const std::string& name);
Symbol(); ///< Creates a new _empty_ Symbol instance.
Symbol(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
};
/// A JavaScript object value.
class Object : public Value {
public:
/// Enables property and element assignments using indexing syntax.
///
/// Example:
///
/// Napi::Value propertyValue = object1['A'];
/// object2['A'] = propertyValue;
/// Napi::Value elementValue = array[0];
/// array[1] = elementValue;
template <typename Key>
class PropertyLValue {
public:
/// Converts an L-value to a value.
operator Value() const;
/// Assigns a value to the property. The type of value can be
/// anything supported by `Object::Set`.
template <typename ValueType>
PropertyLValue& operator =(ValueType value);
private:
PropertyLValue() = delete;
PropertyLValue(Object object, Key key);
napi_env _env;
napi_value _object;
Key _key;
friend class Napi::Object;
};
/// Creates a new Object value.
static Object New(
napi_env env ///< N-API environment
);
Object(); ///< Creates a new _empty_ Object instance.
Object(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
/// Gets or sets a named property.
PropertyLValue<std::string> operator [](
const char* utf8name ///< UTF-8 encoded null-terminated property name
);
/// Gets or sets a named property.
PropertyLValue<std::string> operator [](
const std::string& utf8name ///< UTF-8 encoded property name
);
/// Gets or sets an indexed property or array element.
PropertyLValue<uint32_t> operator [](
uint32_t index /// Property / element index
);
/// Gets a named property.
Value operator [](
const char* utf8name ///< UTF-8 encoded null-terminated property name
) const;
/// Gets a named property.
Value operator [](
const std::string& utf8name ///< UTF-8 encoded property name
) const;
/// Gets an indexed property or array element.
Value operator [](
uint32_t index ///< Property / element index
) const;
/// Checks whether a property is present.
bool Has(
napi_value key ///< Property key primitive
) const;
/// Checks whether a property is present.
bool Has(
Value key ///< Property key
) const;
/// Checks whether a named property is present.
bool Has(
const char* utf8name ///< UTF-8 encoded null-terminated property name
) const;
/// Checks whether a named property is present.
bool Has(
const std::string& utf8name ///< UTF-8 encoded property name
) const;
/// Checks whether a own property is present.
bool HasOwnProperty(
napi_value key ///< Property key primitive
) const;
/// Checks whether a own property is present.
bool HasOwnProperty(
Value key ///< Property key
) const;
/// Checks whether a own property is present.
bool HasOwnProperty(
const char* utf8name ///< UTF-8 encoded null-terminated property name
) const;
/// Checks whether a own property is present.
bool HasOwnProperty(
const std::string& utf8name ///< UTF-8 encoded property name
) const;
/// Gets a property.
Value Get(
napi_value key ///< Property key primitive
) const;
/// Gets a property.
Value Get(
Value key ///< Property key
) const;
/// Gets a named property.
Value Get(
const char* utf8name ///< UTF-8 encoded null-terminated property name
) const;
/// Gets a named property.
Value Get(
const std::string& utf8name ///< UTF-8 encoded property name
) const;
/// Sets a property.
template <typename ValueType>
void Set(
napi_value key, ///< Property key primitive
const ValueType& value ///< Property value primitive
);
/// Sets a property.
template <typename ValueType>
void Set(
Value key, ///< Property key
const ValueType& value ///< Property value
);
/// Sets a named property.
template <typename ValueType>
void Set(
const char* utf8name, ///< UTF-8 encoded null-terminated property name
const ValueType& value
);
/// Sets a named property.
template <typename ValueType>
void Set(
const std::string& utf8name, ///< UTF-8 encoded property name
const ValueType& value ///< Property value primitive
);
/// Delete property.
bool Delete(
napi_value key ///< Property key primitive
);
/// Delete property.
bool Delete(
Value key ///< Property key
);
/// Delete property.
bool Delete(
const char* utf8name ///< UTF-8 encoded null-terminated property name
);
/// Delete property.
bool Delete(
const std::string& utf8name ///< UTF-8 encoded property name
);
/// Checks whether an indexed property is present.
bool Has(
uint32_t index ///< Property / element index
) const;
/// Gets an indexed property or array element.
Value Get(
uint32_t index ///< Property / element index
) const;
/// Sets an indexed property or array element.
template <typename ValueType>
void Set(
uint32_t index, ///< Property / element index
const ValueType& value ///< Property value primitive
);
/// Deletes an indexed property or array element.
bool Delete(
uint32_t index ///< Property / element index
);
Array GetPropertyNames() const; ///< Get all property names
/// Defines a property on the object.
void DefineProperty(
const PropertyDescriptor& property ///< Descriptor for the property to be defined
);
/// Defines properties on the object.
void DefineProperties(
const std::initializer_list<PropertyDescriptor>& properties
///< List of descriptors for the properties to be defined
);
/// Defines properties on the object.
void DefineProperties(
const std::vector<PropertyDescriptor>& properties
///< Vector of descriptors for the properties to be defined
);
/// Checks if an object is an instance created by a constructor function.
///
/// This is equivalent to the JavaScript `instanceof` operator.
bool InstanceOf(
const Function& constructor ///< Constructor function
) const;
};
template <typename T>
class External : public Value {
public:
static External New(napi_env env, T* data);
// Finalizer must implement `void operator()(Env env, T* data)`.
template <typename Finalizer>
static External New(napi_env env,
T* data,
Finalizer finalizeCallback);
// Finalizer must implement `void operator()(Env env, T* data, Hint* hint)`.
template <typename Finalizer, typename Hint>
static External New(napi_env env,
T* data,
Finalizer finalizeCallback,
Hint* finalizeHint);
External();
External(napi_env env, napi_value value);
T* Data() const;
};
class Array : public Object {
public:
static Array New(napi_env env);
static Array New(napi_env env, size_t length);
Array();
Array(napi_env env, napi_value value);
uint32_t Length() const;
};
/// A JavaScript array buffer value.
class ArrayBuffer : public Object {
public:
/// Creates a new ArrayBuffer instance over a new automatically-allocated buffer.
static ArrayBuffer New(
napi_env env, ///< N-API environment
size_t byteLength ///< Length of the buffer to be allocated, in bytes
);
/// Creates a new ArrayBuffer instance, using an external buffer with specified byte length.
static ArrayBuffer New(
napi_env env, ///< N-API environment
void* externalData, ///< Pointer to the external buffer to be used by the array
size_t byteLength ///< Length of the external buffer to be used by the array, in bytes
);
/// Creates a new ArrayBuffer instance, using an external buffer with specified byte length.
template <typename Finalizer>
static ArrayBuffer New(
napi_env env, ///< N-API environment
void* externalData, ///< Pointer to the external buffer to be used by the array
size_t byteLength, ///< Length of the external buffer to be used by the array,
/// in bytes
Finalizer finalizeCallback ///< Function to be called when the array buffer is destroyed;
/// must implement `void operator()(Env env, void* externalData)`
);
/// Creates a new ArrayBuffer instance, using an external buffer with specified byte length.
template <typename Finalizer, typename Hint>
static ArrayBuffer New(
napi_env env, ///< N-API environment
void* externalData, ///< Pointer to the external buffer to be used by the array
size_t byteLength, ///< Length of the external buffer to be used by the array,
/// in bytes
Finalizer finalizeCallback, ///< Function to be called when the array buffer is destroyed;
/// must implement `void operator()(Env env, void* externalData, Hint* hint)`
Hint* finalizeHint ///< Hint (second parameter) to be passed to the finalize callback
);
ArrayBuffer(); ///< Creates a new _empty_ ArrayBuffer instance.
ArrayBuffer(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
void* Data(); ///< Gets a pointer to the data buffer.
size_t ByteLength(); ///< Gets the length of the array buffer in bytes.
private:
mutable void* _data;
mutable size_t _length;
ArrayBuffer(napi_env env, napi_value value, void* data, size_t length);
void EnsureInfo() const;
};
/// A JavaScript typed-array value with unknown array type.
///
/// For type-specific operations, cast to a `TypedArrayOf<T>` instance using the `As()`
/// method:
///
/// Napi::TypedArray array = ...
/// if (t.TypedArrayType() == napi_int32_array) {
/// Napi::Int32Array int32Array = t.As<Napi::Int32Array>();
/// }
class TypedArray : public Object {
public:
TypedArray(); ///< Creates a new _empty_ TypedArray instance.
TypedArray(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
napi_typedarray_type TypedArrayType() const; ///< Gets the type of this typed-array.
Napi::ArrayBuffer ArrayBuffer() const; ///< Gets the backing array buffer.
uint8_t ElementSize() const; ///< Gets the size in bytes of one element in the array.
size_t ElementLength() const; ///< Gets the number of elements in the array.
size_t ByteOffset() const; ///< Gets the offset into the buffer where the array starts.
size_t ByteLength() const; ///< Gets the length of the array in bytes.
protected:
/// !cond INTERNAL
napi_typedarray_type _type;
size_t _length;
TypedArray(napi_env env, napi_value value, napi_typedarray_type type, size_t length);
static const napi_typedarray_type unknown_array_type = static_cast<napi_typedarray_type>(-1);
template <typename T>
static
#if defined(NAPI_HAS_CONSTEXPR)
constexpr
#endif
napi_typedarray_type TypedArrayTypeForPrimitiveType() {
return std::is_same<T, int8_t>::value ? napi_int8_array
: std::is_same<T, uint8_t>::value ? napi_uint8_array
: std::is_same<T, int16_t>::value ? napi_int16_array
: std::is_same<T, uint16_t>::value ? napi_uint16_array
: std::is_same<T, int32_t>::value ? napi_int32_array
: std::is_same<T, uint32_t>::value ? napi_uint32_array
: std::is_same<T, float>::value ? napi_float32_array
: std::is_same<T, double>::value ? napi_float64_array
// currently experimental guard with version of NAPI_VERSION that it is
// released in once it is no longer experimental
#if (NAPI_VERSION > 2147483646)
: std::is_same<T, int64_t>::value ? napi_bigint64_array
: std::is_same<T, uint64_t>::value ? napi_biguint64_array
#endif // NAPI_EXPERIMENTAL
: unknown_array_type;
}
/// !endcond
};
/// A JavaScript typed-array value with known array type.
///
/// Note while it is possible to create and access Uint8 "clamped" arrays using this class,
/// the _clamping_ behavior is only applied in JavaScript.
template <typename T>
class TypedArrayOf : public TypedArray {
public:
/// Creates a new TypedArray instance over a new automatically-allocated array buffer.
///
/// The array type parameter can normally be omitted (because it is inferred from the template
/// parameter T), except when creating a "clamped" array:
///
/// Uint8Array::New(env, length, napi_uint8_clamped_array)
static TypedArrayOf New(
napi_env env, ///< N-API environment
size_t elementLength, ///< Length of the created array, as a number of elements
#if defined(NAPI_HAS_CONSTEXPR)
napi_typedarray_type type = TypedArray::TypedArrayTypeForPrimitiveType<T>()
#else
napi_typedarray_type type
#endif
///< Type of array, if different from the default array type for the template parameter T.
);
/// Creates a new TypedArray instance over a provided array buffer.
///
/// The array type parameter can normally be omitted (because it is inferred from the template
/// parameter T), except when creating a "clamped" array:
///
/// Uint8Array::New(env, length, buffer, 0, napi_uint8_clamped_array)
static TypedArrayOf New(
napi_env env, ///< N-API environment
size_t elementLength, ///< Length of the created array, as a number of elements
Napi::ArrayBuffer arrayBuffer, ///< Backing array buffer instance to use
size_t bufferOffset, ///< Offset into the array buffer where the typed-array starts
#if defined(NAPI_HAS_CONSTEXPR)
napi_typedarray_type type = TypedArray::TypedArrayTypeForPrimitiveType<T>()
#else
napi_typedarray_type type
#endif
///< Type of array, if different from the default array type for the template parameter T.
);
TypedArrayOf(); ///< Creates a new _empty_ TypedArrayOf instance.
TypedArrayOf(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
T& operator [](size_t index); ///< Gets or sets an element in the array.
const T& operator [](size_t index) const; ///< Gets an element in the array.
/// Gets a pointer to the array's backing buffer.
///
/// This is not necessarily the same as the `ArrayBuffer::Data()` pointer, because the
/// typed-array may have a non-zero `ByteOffset()` into the `ArrayBuffer`.
T* Data();
/// Gets a pointer to the array's backing buffer.
///
/// This is not necessarily the same as the `ArrayBuffer::Data()` pointer, because the
/// typed-array may have a non-zero `ByteOffset()` into the `ArrayBuffer`.
const T* Data() const;
private:
T* _data;
TypedArrayOf(napi_env env,
napi_value value,
napi_typedarray_type type,
size_t length,
T* data);
};
/// The DataView provides a low-level interface for reading/writing multiple
/// number types in an ArrayBuffer irrespective of the platform's endianness.
class DataView : public Object {
public:
static DataView New(napi_env env,
Napi::ArrayBuffer arrayBuffer);
static DataView New(napi_env env,
Napi::ArrayBuffer arrayBuffer,
size_t byteOffset);
static DataView New(napi_env env,
Napi::ArrayBuffer arrayBuffer,
size_t byteOffset,
size_t byteLength);
DataView(); ///< Creates a new _empty_ DataView instance.
DataView(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
Napi::ArrayBuffer ArrayBuffer() const; ///< Gets the backing array buffer.
size_t ByteOffset() const; ///< Gets the offset into the buffer where the array starts.
size_t ByteLength() const; ///< Gets the length of the array in bytes.
void* Data() const;
float GetFloat32(size_t byteOffset) const;
double GetFloat64(size_t byteOffset) const;
int8_t GetInt8(size_t byteOffset) const;
int16_t GetInt16(size_t byteOffset) const;
int32_t GetInt32(size_t byteOffset) const;
uint8_t GetUint8(size_t byteOffset) const;
uint16_t GetUint16(size_t byteOffset) const;
uint32_t GetUint32(size_t byteOffset) const;
void SetFloat32(size_t byteOffset, float value) const;
void SetFloat64(size_t byteOffset, double value) const;
void SetInt8(size_t byteOffset, int8_t value) const;
void SetInt16(size_t byteOffset, int16_t value) const;
void SetInt32(size_t byteOffset, int32_t value) const;
void SetUint8(size_t byteOffset, uint8_t value) const;
void SetUint16(size_t byteOffset, uint16_t value) const;
void SetUint32(size_t byteOffset, uint32_t value) const;
private:
template <typename T>
T ReadData(size_t byteOffset) const;
template <typename T>
void WriteData(size_t byteOffset, T value) const;
void* _data;
size_t _length;
};
class Function : public Object {
public:
/// Callable must implement operator() accepting a const CallbackInfo&
/// and return either void or Value.
template <typename Callable>
static Function New(napi_env env,
Callable cb,
const char* utf8name = nullptr,
void* data = nullptr);
/// Callable must implement operator() accepting a const CallbackInfo&
/// and return either void or Value.
template <typename Callable>
static Function New(napi_env env,
Callable cb,
const std::string& utf8name,
void* data = nullptr);
Function();
Function(napi_env env, napi_value value);
Value operator ()(const std::initializer_list<napi_value>& args) const;
Value Call(const std::initializer_list<napi_value>& args) const;
Value Call(const std::vector<napi_value>& args) const;
Value Call(size_t argc, const napi_value* args) const;
Value Call(napi_value recv, const std::initializer_list<napi_value>& args) const;
Value Call(napi_value recv, const std::vector<napi_value>& args) const;
Value Call(napi_value recv, size_t argc, const napi_value* args) const;
Value MakeCallback(napi_value recv,
const std::initializer_list<napi_value>& args,
napi_async_context context = nullptr) const;
Value MakeCallback(napi_value recv,
const std::vector<napi_value>& args,
napi_async_context context = nullptr) const;
Value MakeCallback(napi_value recv,
size_t argc,
const napi_value* args,
napi_async_context context = nullptr) const;
Object New(const std::initializer_list<napi_value>& args) const;
Object New(const std::vector<napi_value>& args) const;
Object New(size_t argc, const napi_value* args) const;
};
class Promise : public Object {
public:
class Deferred {
public:
static Deferred New(napi_env env);
Deferred(napi_env env);
Napi::Promise Promise() const;
Napi::Env Env() const;
void Resolve(napi_value value) const;
void Reject(napi_value value) const;
private:
napi_env _env;
napi_deferred _deferred;
napi_value _promise;
};
Promise(napi_env env, napi_value value);
};
template <typename T>
class Buffer : public Uint8Array {
public:
static Buffer<T> New(napi_env env, size_t length);
static Buffer<T> New(napi_env env, T* data, size_t length);
// Finalizer must implement `void operator()(Env env, T* data)`.
template <typename Finalizer>
static Buffer<T> New(napi_env env, T* data,
size_t length,
Finalizer finalizeCallback);
// Finalizer must implement `void operator()(Env env, T* data, Hint* hint)`.
template <typename Finalizer, typename Hint>
static Buffer<T> New(napi_env env, T* data,
size_t length,
Finalizer finalizeCallback,
Hint* finalizeHint);
static Buffer<T> Copy(napi_env env, const T* data, size_t length);
Buffer();
Buffer(napi_env env, napi_value value);
size_t Length() const;
T* Data() const;
private:
mutable size_t _length;
mutable T* _data;
Buffer(napi_env env, napi_value value, size_t length, T* data);
void EnsureInfo() const;
};
/// Holds a counted reference to a value; initially a weak reference unless otherwise specified,
/// may be changed to/from a strong reference by adjusting the refcount.
///
/// The referenced value is not immediately destroyed when the reference count is zero; it is
/// merely then eligible for garbage-collection if there are no other references to the value.
template <typename T>
class Reference {
public:
static Reference<T> New(const T& value, uint32_t initialRefcount = 0);
Reference();
Reference(napi_env env, napi_ref ref);
~Reference();
// A reference can be moved but cannot be copied.
Reference(Reference<T>&& other);
Reference<T>& operator =(Reference<T>&& other);
Reference<T>& operator =(Reference<T>&) = delete;
operator napi_ref() const;
bool operator ==(const Reference<T> &other) const;
bool operator !=(const Reference<T> &other) const;
Napi::Env Env() const;
bool IsEmpty() const;
// Note when getting the value of a Reference it is usually correct to do so
// within a HandleScope so that the value handle gets cleaned up efficiently.
T Value() const;
uint32_t Ref();
uint32_t Unref();
void Reset();
void Reset(const T& value, uint32_t refcount = 0);
// Call this on a reference that is declared as static data, to prevent its destructor
// from running at program shutdown time, which would attempt to reset the reference when
// the environment is no longer valid.
void SuppressDestruct();
protected:
Reference(const Reference<T>&);
/// !cond INTERNAL
napi_env _env;
napi_ref _ref;
/// !endcond
private:
bool _suppressDestruct;
};
class ObjectReference: public Reference<Object> {
public:
ObjectReference();
ObjectReference(napi_env env, napi_ref ref);
// A reference can be moved but cannot be copied.
ObjectReference(Reference<Object>&& other);
ObjectReference& operator =(Reference<Object>&& other);
ObjectReference(ObjectReference&& other);
ObjectReference& operator =(ObjectReference&& other);
ObjectReference& operator =(ObjectReference&) = delete;
Napi::Value Get(const char* utf8name) const;
Napi::Value Get(const std::string& utf8name) const;
void Set(const char* utf8name, napi_value value);
void Set(const char* utf8name, Napi::Value value);
void Set(const char* utf8name, const char* utf8value);
void Set(const char* utf8name, bool boolValue);
void Set(const char* utf8name, double numberValue);
void Set(const std::string& utf8name, napi_value value);
void Set(const std::string& utf8name, Napi::Value value);
void Set(const std::string& utf8name, std::string& utf8value);
void Set(const std::string& utf8name, bool boolValue);
void Set(const std::string& utf8name, double numberValue);
Napi::Value Get(uint32_t index) const;
void Set(uint32_t index, const napi_value value);
void Set(uint32_t index, const Napi::Value value);
void Set(uint32_t index, const char* utf8value);
void Set(uint32_t index, const std::string& utf8value);
void Set(uint32_t index, bool boolValue);
void Set(uint32_t index, double numberValue);
protected:
ObjectReference(const ObjectReference&);
};
class FunctionReference: public Reference<Function> {
public:
FunctionReference();
FunctionReference(napi_env env, napi_ref ref);
// A reference can be moved but cannot be copied.
FunctionReference(Reference<Function>&& other);
FunctionReference& operator =(Reference<Function>&& other);
FunctionReference(FunctionReference&& other);
FunctionReference& operator =(FunctionReference&& other);
FunctionReference(const FunctionReference&) = delete;
FunctionReference& operator =(FunctionReference&) = delete;
Napi::Value operator ()(const std::initializer_list<napi_value>& args) const;
Napi::Value Call(const std::initializer_list<napi_value>& args) const;
Napi::Value Call(const std::vector<napi_value>& args) const;
Napi::Value Call(napi_value recv, const std::initializer_list<napi_value>& args) const;
Napi::Value Call(napi_value recv, const std::vector<napi_value>& args) const;
Napi::Value Call(napi_value recv, size_t argc, const napi_value* args) const;
Napi::Value MakeCallback(napi_value recv,
const std::initializer_list<napi_value>& args,
napi_async_context context = nullptr) const;
Napi::Value MakeCallback(napi_value recv,
const std::vector<napi_value>& args,
napi_async_context context = nullptr) const;
Napi::Value MakeCallback(napi_value recv,
size_t argc,
const napi_value* args,
napi_async_context context = nullptr) const;
Object New(const std::initializer_list<napi_value>& args) const;
Object New(const std::vector<napi_value>& args) const;
};
// Shortcuts to creating a new reference with inferred type and refcount = 0.
template <typename T> Reference<T> Weak(T value);
ObjectReference Weak(Object value);
FunctionReference Weak(Function value);
// Shortcuts to creating a new reference with inferred type and refcount = 1.
template <typename T> Reference<T> Persistent(T value);
ObjectReference Persistent(Object value);
FunctionReference Persistent(Function value);
/// A persistent reference to a JavaScript error object. Use of this class depends somewhat
/// on whether C++ exceptions are enabled at compile time.
///
/// ### Handling Errors With C++ Exceptions
///
/// If C++ exceptions are enabled, then the `Error` class extends `std::exception` and enables
/// integrated error-handling for C++ exceptions and JavaScript exceptions.
///
/// If a N-API call fails without executing any JavaScript code (for example due to an invalid
/// argument), then the N-API wrapper automatically converts and throws the error as a C++
/// exception of type `Napi::Error`. Or if a JavaScript function called by C++ code via N-API
/// throws a JavaScript exception, then the N-API wrapper automatically converts and throws it as
/// a C++ exception of type `Napi::Error`.
///
/// If a C++ exception of type `Napi::Error` escapes from a N-API C++ callback, then the N-API
/// wrapper automatically converts and throws it as a JavaScript exception. Therefore, catching
/// a C++ exception of type `Napi::Error` prevents a JavaScript exception from being thrown.
///
/// #### Example 1A - Throwing a C++ exception:
///
/// Napi::Env env = ...
/// throw Napi::Error::New(env, "Example exception");
///
/// Following C++ statements will not be executed. The exception will bubble up as a C++
/// exception of type `Napi::Error`, until it is either caught while still in C++, or else
/// automatically propataged as a JavaScript exception when the callback returns to JavaScript.
///
/// #### Example 2A - Propagating a N-API C++ exception:
///
/// Napi::Function jsFunctionThatThrows = someObj.As<Napi::Function>();
/// Napi::Value result = jsFunctionThatThrows({ arg1, arg2 });
///
/// Following C++ statements will not be executed. The exception will bubble up as a C++
/// exception of type `Napi::Error`, until it is either caught while still in C++, or else
/// automatically propagated as a JavaScript exception when the callback returns to JavaScript.
///
/// #### Example 3A - Handling a N-API C++ exception:
///
/// Napi::Function jsFunctionThatThrows = someObj.As<Napi::Function>();
/// Napi::Value result;
/// try {
/// result = jsFunctionThatThrows({ arg1, arg2 });
/// } catch (const Napi::Error& e) {
/// cerr << "Caught JavaScript exception: " + e.what();
/// }
///
/// Since the exception was caught here, it will not be propagated as a JavaScript exception.
///
/// ### Handling Errors Without C++ Exceptions
///
/// If C++ exceptions are disabled (by defining `NAPI_DISABLE_CPP_EXCEPTIONS`) then this class
/// does not extend `std::exception`, and APIs in the `Napi` namespace do not throw C++
/// exceptions when they fail. Instead, they raise _pending_ JavaScript exceptions and
/// return _empty_ `Value`s. Calling code should check `Value::IsEmpty()` before attempting
/// to use a returned value, and may use methods on the `Env` class to check for, get, and
/// clear a pending JavaScript exception. If the pending exception is not cleared, it will
/// be thrown when the native callback returns to JavaScript.
///
/// #### Example 1B - Throwing a JS exception
///
/// Napi::Env env = ...
/// Napi::Error::New(env, "Example exception").ThrowAsJavaScriptException();
/// return;
///
/// After throwing a JS exception, the code should generally return immediately from the native
/// callback, after performing any necessary cleanup.
///
/// #### Example 2B - Propagating a N-API JS exception:
///
/// Napi::Function jsFunctionThatThrows = someObj.As<Napi::Function>();
/// Napi::Value result = jsFunctionThatThrows({ arg1, arg2 });
/// if (result.IsEmpty()) return;
///
/// An empty value result from a N-API call indicates an error occurred, and a JavaScript
/// exception is pending. To let the exception propagate, the code should generally return
/// immediately from the native callback, after performing any necessary cleanup.
///
/// #### Example 3B - Handling a N-API JS exception:
///
/// Napi::Function jsFunctionThatThrows = someObj.As<Napi::Function>();
/// Napi::Value result = jsFunctionThatThrows({ arg1, arg2 });
/// if (result.IsEmpty()) {
/// Napi::Error e = env.GetAndClearPendingException();
/// cerr << "Caught JavaScript exception: " + e.Message();
/// }
///
/// Since the exception was cleared here, it will not be propagated as a JavaScript exception
/// after the native callback returns.
class Error : public ObjectReference
#ifdef NAPI_CPP_EXCEPTIONS
, public std::exception
#endif // NAPI_CPP_EXCEPTIONS
{
public:
static Error New(napi_env env);
static Error New(napi_env env, const char* message);
static Error New(napi_env env, const std::string& message);
static NAPI_NO_RETURN void Fatal(const char* location, const char* message);
Error();
Error(napi_env env, napi_value value);
// An error can be moved or copied.
Error(Error&& other);
Error& operator =(Error&& other);
Error(const Error&);
Error& operator =(Error&);
const std::string& Message() const NAPI_NOEXCEPT;
void ThrowAsJavaScriptException() const;
#ifdef NAPI_CPP_EXCEPTIONS
const char* what() const NAPI_NOEXCEPT override;
#endif // NAPI_CPP_EXCEPTIONS
protected:
/// !cond INTERNAL
typedef napi_status (*create_error_fn)(napi_env envb, napi_value code, napi_value msg, napi_value* result);
template <typename TError>
static TError New(napi_env env,
const char* message,
size_t length,
create_error_fn create_error);
/// !endcond
private:
mutable std::string _message;
};
class TypeError : public Error {
public:
static TypeError New(napi_env env, const char* message);
static TypeError New(napi_env env, const std::string& message);
TypeError();
TypeError(napi_env env, napi_value value);
};
class RangeError : public Error {
public:
static RangeError New(napi_env env, const char* message);
static RangeError New(napi_env env, const std::string& message);
RangeError();
RangeError(napi_env env, napi_value value);
};
class CallbackInfo {
public:
CallbackInfo(napi_env env, napi_callback_info info);
~CallbackInfo();
// Disallow copying to prevent multiple free of _dynamicArgs
CallbackInfo(CallbackInfo const &) = delete;
void operator=(CallbackInfo const &) = delete;
Napi::Env Env() const;
Value NewTarget() const;
bool IsConstructCall() const;
size_t Length() const;
const Value operator [](size_t index) const;
Value This() const;
void* Data() const;
void SetData(void* data);
private:
const size_t _staticArgCount = 6;
napi_env _env;
napi_callback_info _info;
napi_value _this;
size_t _argc;
napi_value* _argv;
napi_value _staticArgs[6];
napi_value* _dynamicArgs;
void* _data;
};
class PropertyDescriptor {
public:
#ifndef NODE_ADDON_API_DISABLE_DEPRECATED
template <typename Getter>
static PropertyDescriptor Accessor(const char* utf8name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter>
static PropertyDescriptor Accessor(const std::string& utf8name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter>
static PropertyDescriptor Accessor(napi_value name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter>
static PropertyDescriptor Accessor(Name name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(const char* utf8name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(const std::string& utf8name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(napi_value name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(Name name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(const char* utf8name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(const std::string& utf8name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(napi_value name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(Name name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
#endif // !NODE_ADDON_API_DISABLE_DEPRECATED
template <typename Getter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
const char* utf8name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
const std::string& utf8name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
Name name,
Getter getter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
const char* utf8name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
const std::string& utf8name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Getter, typename Setter>
static PropertyDescriptor Accessor(Napi::Env env,
Napi::Object object,
Name name,
Getter getter,
Setter setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(Napi::Env env,
Napi::Object object,
const char* utf8name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(Napi::Env env,
Napi::Object object,
const std::string& utf8name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
template <typename Callable>
static PropertyDescriptor Function(Napi::Env env,
Napi::Object object,
Name name,
Callable cb,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor Value(const char* utf8name,
napi_value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor Value(const std::string& utf8name,
napi_value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor Value(napi_value name,
napi_value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor Value(Name name,
Napi::Value value,
napi_property_attributes attributes = napi_default);
PropertyDescriptor(napi_property_descriptor desc);
operator napi_property_descriptor&();
operator const napi_property_descriptor&() const;
private:
napi_property_descriptor _desc;
};
/// Property descriptor for use with `ObjectWrap::DefineClass()`.
///
/// This is different from the standalone `PropertyDescriptor` because it is specific to each
/// `ObjectWrap<T>` subclass. This prevents using descriptors from a different class when
/// defining a new class (preventing the callbacks from having incorrect `this` pointers).
template <typename T>
class ClassPropertyDescriptor {
public:
ClassPropertyDescriptor(napi_property_descriptor desc) : _desc(desc) {}
operator napi_property_descriptor&() { return _desc; }
operator const napi_property_descriptor&() const { return _desc; }
private:
napi_property_descriptor _desc;
};
/// Base class to be extended by C++ classes exposed to JavaScript; each C++ class instance gets
/// "wrapped" by a JavaScript object that is managed by this class.
///
/// At initialization time, the `DefineClass()` method must be used to
/// hook up the accessor and method callbacks. It takes a list of
/// property descriptors, which can be constructed via the various
/// static methods on the base class.
///
/// #### Example:
///
/// class Example: public Napi::ObjectWrap<Example> {
/// public:
/// static void Initialize(Napi::Env& env, Napi::Object& target) {
/// Napi::Function constructor = DefineClass(env, "Example", {
/// InstanceAccessor("value", &Example::GetSomething, &Example::SetSomething),
/// InstanceMethod("doSomething", &Example::DoSomething),
/// });
/// target.Set("Example", constructor);
/// }
///
/// Example(const Napi::CallbackInfo& info); // Constructor
/// Napi::Value GetSomething(const Napi::CallbackInfo& info);
/// void SetSomething(const Napi::CallbackInfo& info, const Napi::Value& value);
/// Napi::Value DoSomething(const Napi::CallbackInfo& info);
/// }
template <typename T>
class ObjectWrap : public Reference<Object> {
public:
ObjectWrap(const CallbackInfo& callbackInfo);
static T* Unwrap(Object wrapper);
// Methods exposed to JavaScript must conform to one of these callback signatures.
typedef void (*StaticVoidMethodCallback)(const CallbackInfo& info);
typedef Napi::Value (*StaticMethodCallback)(const CallbackInfo& info);
typedef Napi::Value (*StaticGetterCallback)(const CallbackInfo& info);
typedef void (*StaticSetterCallback)(const CallbackInfo& info, const Napi::Value& value);
typedef void (T::*InstanceVoidMethodCallback)(const CallbackInfo& info);
typedef Napi::Value (T::*InstanceMethodCallback)(const CallbackInfo& info);
typedef Napi::Value (T::*InstanceGetterCallback)(const CallbackInfo& info);
typedef void (T::*InstanceSetterCallback)(const CallbackInfo& info, const Napi::Value& value);
typedef ClassPropertyDescriptor<T> PropertyDescriptor;
static Function DefineClass(Napi::Env env,
const char* utf8name,
const std::initializer_list<PropertyDescriptor>& properties,
void* data = nullptr);
static Function DefineClass(Napi::Env env,
const char* utf8name,
const std::vector<PropertyDescriptor>& properties,
void* data = nullptr);
static PropertyDescriptor StaticMethod(const char* utf8name,
StaticVoidMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticMethod(const char* utf8name,
StaticMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticMethod(Symbol name,
StaticVoidMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticMethod(Symbol name,
StaticMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticAccessor(const char* utf8name,
StaticGetterCallback getter,
StaticSetterCallback setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticAccessor(Symbol name,
StaticGetterCallback getter,
StaticSetterCallback setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceMethod(const char* utf8name,
InstanceVoidMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceMethod(const char* utf8name,
InstanceMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceMethod(Symbol name,
InstanceVoidMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceMethod(Symbol name,
InstanceMethodCallback method,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceAccessor(const char* utf8name,
InstanceGetterCallback getter,
InstanceSetterCallback setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor InstanceAccessor(Symbol name,
InstanceGetterCallback getter,
InstanceSetterCallback setter,
napi_property_attributes attributes = napi_default,
void* data = nullptr);
static PropertyDescriptor StaticValue(const char* utf8name,
Napi::Value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor StaticValue(Symbol name,
Napi::Value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor InstanceValue(const char* utf8name,
Napi::Value value,
napi_property_attributes attributes = napi_default);
static PropertyDescriptor InstanceValue(Symbol name,
Napi::Value value,
napi_property_attributes attributes = napi_default);
private:
static napi_value ConstructorCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value StaticVoidMethodCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value StaticMethodCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value StaticGetterCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value StaticSetterCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value InstanceVoidMethodCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value InstanceMethodCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value InstanceGetterCallbackWrapper(napi_env env, napi_callback_info info);
static napi_value InstanceSetterCallbackWrapper(napi_env env, napi_callback_info info);
static void FinalizeCallback(napi_env env, void* data, void* hint);
static Function DefineClass(Napi::Env env,
const char* utf8name,
const size_t props_count,
const napi_property_descriptor* props,
void* data = nullptr);
template <typename TCallback>
struct MethodCallbackData {
TCallback callback;
void* data;
};
typedef MethodCallbackData<StaticVoidMethodCallback> StaticVoidMethodCallbackData;
typedef MethodCallbackData<StaticMethodCallback> StaticMethodCallbackData;
typedef MethodCallbackData<InstanceVoidMethodCallback> InstanceVoidMethodCallbackData;
typedef MethodCallbackData<InstanceMethodCallback> InstanceMethodCallbackData;
template <typename TGetterCallback, typename TSetterCallback>
struct AccessorCallbackData {
TGetterCallback getterCallback;
TSetterCallback setterCallback;
void* data;
};
typedef AccessorCallbackData<StaticGetterCallback, StaticSetterCallback>
StaticAccessorCallbackData;
typedef AccessorCallbackData<InstanceGetterCallback, InstanceSetterCallback>
InstanceAccessorCallbackData;
};
class HandleScope {
public:
HandleScope(napi_env env, napi_handle_scope scope);
explicit HandleScope(Napi::Env env);
~HandleScope();
operator napi_handle_scope() const;
Napi::Env Env() const;
private:
napi_env _env;
napi_handle_scope _scope;
};
class EscapableHandleScope {
public:
EscapableHandleScope(napi_env env, napi_escapable_handle_scope scope);
explicit EscapableHandleScope(Napi::Env env);
~EscapableHandleScope();
operator napi_escapable_handle_scope() const;
Napi::Env Env() const;
Value Escape(napi_value escapee);
private:
napi_env _env;
napi_escapable_handle_scope _scope;
};
#if (NAPI_VERSION > 2)
class CallbackScope {
public:
CallbackScope(napi_env env, napi_callback_scope scope);
CallbackScope(napi_env env, napi_async_context context);
virtual ~CallbackScope();
operator napi_callback_scope() const;
Napi::Env Env() const;
private:
napi_env _env;
napi_callback_scope _scope;
};
#endif
class AsyncContext {
public:
explicit AsyncContext(napi_env env, const char* resource_name);
explicit AsyncContext(napi_env env, const char* resource_name, const Object& resource);
virtual ~AsyncContext();
AsyncContext(AsyncContext&& other);
AsyncContext& operator =(AsyncContext&& other);
AsyncContext(const AsyncContext&) = delete;
AsyncContext& operator =(AsyncContext&) = delete;
operator napi_async_context() const;
private:
napi_env _env;
napi_async_context _context;
};
class AsyncWorker {
public:
virtual ~AsyncWorker();
// An async worker can be moved but cannot be copied.
AsyncWorker(AsyncWorker&& other);
AsyncWorker& operator =(AsyncWorker&& other);
AsyncWorker(const AsyncWorker&) = delete;
AsyncWorker& operator =(AsyncWorker&) = delete;
operator napi_async_work() const;
Napi::Env Env() const;
void Queue();
void Cancel();
void SuppressDestruct();
ObjectReference& Receiver();
FunctionReference& Callback();
protected:
explicit AsyncWorker(const Function& callback);
explicit AsyncWorker(const Function& callback,
const char* resource_name);
explicit AsyncWorker(const Function& callback,
const char* resource_name,
const Object& resource);
explicit AsyncWorker(const Object& receiver,
const Function& callback);
explicit AsyncWorker(const Object& receiver,
const Function& callback,
const char* resource_name);
explicit AsyncWorker(const Object& receiver,
const Function& callback,
const char* resource_name,
const Object& resource);
explicit AsyncWorker(Napi::Env env);
explicit AsyncWorker(Napi::Env env,
const char* resource_name);
explicit AsyncWorker(Napi::Env env,
const char* resource_name,
const Object& resource);
virtual void Execute() = 0;
virtual void OnOK();
virtual void OnError(const Error& e);
virtual void Destroy();
virtual std::vector<napi_value> GetResult(Napi::Env env);
void SetError(const std::string& error);
private:
static void OnExecute(napi_env env, void* this_pointer);
static void OnWorkComplete(napi_env env,
napi_status status,
void* this_pointer);
napi_env _env;
napi_async_work _work;
ObjectReference _receiver;
FunctionReference _callback;
std::string _error;
bool _suppress_destruct;
};
#if (NAPI_VERSION > 3)
class ThreadSafeFunction {
public:
// This API may only be called from the main thread.
template <typename ResourceString>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context);
// This API may only be called from the main thread.
template <typename ResourceString, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
Finalizer finalizeCallback);
// This API may only be called from the main thread.
template <typename ResourceString, typename Finalizer,
typename FinalizerDataType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
Finalizer finalizeCallback,
FinalizerDataType* data);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context,
Finalizer finalizeCallback);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType,
typename Finalizer, typename FinalizerDataType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context,
Finalizer finalizeCallback,
FinalizerDataType* data);
// This API may only be called from the main thread.
template <typename ResourceString>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context);
// This API may only be called from the main thread.
template <typename ResourceString, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
Finalizer finalizeCallback);
// This API may only be called from the main thread.
template <typename ResourceString, typename Finalizer,
typename FinalizerDataType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
Finalizer finalizeCallback,
FinalizerDataType* data);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context,
Finalizer finalizeCallback);
// This API may only be called from the main thread.
template <typename ResourceString, typename ContextType,
typename Finalizer, typename FinalizerDataType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context,
Finalizer finalizeCallback,
FinalizerDataType* data);
ThreadSafeFunction();
ThreadSafeFunction(napi_threadsafe_function tsFunctionValue);
ThreadSafeFunction(ThreadSafeFunction&& other);
ThreadSafeFunction& operator=(ThreadSafeFunction&& other);
// This API may be called from any thread.
napi_status BlockingCall() const;
// This API may be called from any thread.
template <typename Callback>
napi_status BlockingCall(Callback callback) const;
// This API may be called from any thread.
template <typename DataType, typename Callback>
napi_status BlockingCall(DataType* data, Callback callback) const;
// This API may be called from any thread.
napi_status NonBlockingCall() const;
// This API may be called from any thread.
template <typename Callback>
napi_status NonBlockingCall(Callback callback) const;
// This API may be called from any thread.
template <typename DataType, typename Callback>
napi_status NonBlockingCall(DataType* data, Callback callback) const;
// This API may be called from any thread.
napi_status Acquire() const;
// This API may be called from any thread.
napi_status Release();
// This API may be called from any thread.
napi_status Abort();
struct ConvertibleContext
{
template <class T>
operator T*() { return static_cast<T*>(context); }
void* context;
};
// This API may be called from any thread.
ConvertibleContext GetContext() const;
private:
using CallbackWrapper = std::function<void(Napi::Env, Napi::Function)>;
template <typename ResourceString, typename ContextType,
typename Finalizer, typename FinalizerDataType>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
const Object& resource,
ResourceString resourceName,
size_t maxQueueSize,
size_t initialThreadCount,
ContextType* context,
Finalizer finalizeCallback,
FinalizerDataType* data,
napi_finalize wrapper);
napi_status CallInternal(CallbackWrapper* callbackWrapper,
napi_threadsafe_function_call_mode mode) const;
static void CallJS(napi_env env,
napi_value jsCallback,
void* context,
void* data);
std::unique_ptr<napi_threadsafe_function> _tsfn;
};
#endif
// Memory management.
class MemoryManagement {
public:
static int64_t AdjustExternalMemory(Env env, int64_t change_in_bytes);
};
// Version management
class VersionManagement {
public:
static uint32_t GetNapiVersion(Env env);
static const napi_node_version* GetNodeVersion(Env env);
};
} // namespace Napi
// Inline implementations of all the above class methods are included here.
#include "napi-inl.h"
#endif // SRC_NAPI_H_