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import _CJavaScriptKit
/// `JSValue` represents a value in JavaScript.
@dynamicMemberLookup
public enum JSValue: Equatable {
case boolean(Bool)
case string(JSString)
case number(Double)
case object(JSObject)
case null
case undefined
case function(JSFunction)
case symbol(JSSymbol)
case bigInt(JSBigInt)
/// Returns the `Bool` value of this JS value if its type is boolean.
/// If not, returns `nil`.
public var boolean: Bool? {
switch self {
case let .boolean(boolean): return boolean
default: return nil
}
}
/// Returns the `String` value of this JS value if the type is string.
/// If not, returns `nil`.
///
/// Note that this accessor may copy the JS string value into Swift side memory.
///
/// To avoid the copying, please consider the `jsString` instead.
public var string: String? {
jsString.map(String.init)
}
/// Returns the `JSString` value of this JS value if the type is string.
/// If not, returns `nil`.
///
public var jsString: JSString? {
switch self {
case let .string(string): return string
default: return nil
}
}
/// Returns the `Double` value of this JS value if the type is number.
/// If not, returns `nil`.
public var number: Double? {
switch self {
case let .number(number): return number
default: return nil
}
}
/// Returns the `JSObject` of this JS value if its type is object.
/// If not, returns `nil`.
public var object: JSObject? {
switch self {
case let .object(object): return object
default: return nil
}
}
/// Returns the `JSFunction` of this JS value if its type is function.
/// If not, returns `nil`.
public var function: JSFunction? {
switch self {
case let .function(function): return function
default: return nil
}
}
/// Returns the `JSSymbol` of this JS value if its type is function.
/// If not, returns `nil`.
public var symbol: JSSymbol? {
switch self {
case let .symbol(symbol): return symbol
default: return nil
}
}
/// Returns the `JSBigInt` of this JS value if its type is function.
/// If not, returns `nil`.
public var bigInt: JSBigInt? {
switch self {
case let .bigInt(bigInt): return bigInt
default: return nil
}
}
/// Returns the `true` if this JS value is null.
/// If not, returns `false`.
public var isNull: Bool {
return self == .null
}
/// Returns the `true` if this JS value is undefined.
/// If not, returns `false`.
public var isUndefined: Bool {
return self == .undefined
}
}
public extension JSValue {
/// An unsafe convenience method of `JSObject.subscript(_ name: String) -> ((ConvertibleToJSValue...) -> JSValue)?`
/// - Precondition: `self` must be a JavaScript Object and specified member should be a callable object.
subscript(dynamicMember name: String) -> ((ConvertibleToJSValue...) -> JSValue) {
object![dynamicMember: name]!
}
/// An unsafe convenience method of `JSObject.subscript(_ index: Int) -> JSValue`
/// - Precondition: `self` must be a JavaScript Object.
subscript(dynamicMember name: String) -> JSValue {
get { self.object![name] }
set { self.object![name] = newValue }
}
/// An unsafe convenience method of `JSObject.subscript(_ index: Int) -> JSValue`
/// - Precondition: `self` must be a JavaScript Object.
subscript(_ index: Int) -> JSValue {
get { object![index] }
set { object![index] = newValue }
}
}
extension JSValue: Swift.Error {}
public extension JSValue {
func fromJSValue<Type>() -> Type? where Type: ConstructibleFromJSValue {
return Type.construct(from: self)
}
}
public extension JSValue {
static func string(_ value: String) -> JSValue {
.string(JSString(value))
}
/// Deprecated: Please create `JSClosure` directly and manage its lifetime manually.
///
/// Migrate this usage
///
/// ```swift
/// button.addEventListener!("click", JSValue.function { _ in
/// ...
/// return JSValue.undefined
/// })
/// ```
///
/// into below code.
///
/// ```swift
/// let eventListenter = JSClosure { _ in
/// ...
/// return JSValue.undefined
/// }
///
/// button.addEventListener!("click", JSValue.function(eventListenter))
/// ...
/// button.removeEventListener!("click", JSValue.function(eventListenter))
/// eventListenter.release()
/// ```
@available(*, deprecated, message: "Please create JSClosure directly and manage its lifetime manually.")
static func function(_ body: @escaping ([JSValue]) -> JSValue) -> JSValue {
.object(JSClosure(body))
}
@available(*, deprecated, renamed: "object", message: "JSClosure is no longer a subclass of JSFunction. Use .object(closure) instead.")
static func function(_ closure: JSClosure) -> JSValue {
.object(closure)
}
}
extension JSValue: ExpressibleByStringLiteral {
public init(stringLiteral value: String) {
self = .string(JSString(value))
}
}
extension JSValue: ExpressibleByIntegerLiteral {
public init(integerLiteral value: Int32) {
self = .number(Double(value))
}
}
extension JSValue: ExpressibleByFloatLiteral {
public init(floatLiteral value: Double) {
self = .number(value)
}
}
extension JSValue: ExpressibleByNilLiteral {
public init(nilLiteral _: ()) {
self = .null
}
}
public func getJSValue(this: JSObject, name: JSString) -> JSValue {
var rawValue = RawJSValue()
let rawBitPattern = _get_prop(
this.id, name.asInternalJSRef(),
&rawValue.payload1, &rawValue.payload2
)
rawValue.kind = unsafeBitCast(rawBitPattern, to: JavaScriptValueKind.self)
return rawValue.jsValue
}
public func setJSValue(this: JSObject, name: JSString, value: JSValue) {
value.withRawJSValue { rawValue in
_set_prop(this.id, name.asInternalJSRef(), rawValue.kind, rawValue.payload1, rawValue.payload2)
}
}
public func getJSValue(this: JSObject, index: Int32) -> JSValue {
var rawValue = RawJSValue()
let rawBitPattern = _get_subscript(
this.id, index,
&rawValue.payload1, &rawValue.payload2
)
rawValue.kind = unsafeBitCast(rawBitPattern, to: JavaScriptValueKind.self)
return rawValue.jsValue
}
public func setJSValue(this: JSObject, index: Int32, value: JSValue) {
value.withRawJSValue { rawValue in
_set_subscript(this.id, index,
rawValue.kind,
rawValue.payload1, rawValue.payload2)
}
}
public func getJSValue(this: JSObject, symbol: JSSymbol) -> JSValue {
var rawValue = RawJSValue()
let rawBitPattern = _get_prop(
this.id, symbol.id,
&rawValue.payload1, &rawValue.payload2
)
rawValue.kind = unsafeBitCast(rawBitPattern, to: JavaScriptValueKind.self)
return rawValue.jsValue
}
public func setJSValue(this: JSObject, symbol: JSSymbol, value: JSValue) {
value.withRawJSValue { rawValue in
_set_prop(this.id, symbol.id, rawValue.kind, rawValue.payload1, rawValue.payload2)
}
}
public extension JSValue {
/// Return `true` if this value is an instance of the passed `constructor` function.
/// Returns `false` for everything except objects and functions.
/// - Parameter constructor: The constructor function to check.
/// - Returns: The result of `instanceof` in the JavaScript environment.
func isInstanceOf(_ constructor: JSFunction) -> Bool {
switch self {
case .boolean, .string, .number, .null, .undefined, .symbol, .bigInt:
return false
case let .object(ref):
return ref.isInstanceOf(constructor)
case let .function(ref):
return ref.isInstanceOf(constructor)
}
}
}
extension JSValue: CustomStringConvertible {
public var description: String {
// per https://tc39.es/ecma262/multipage/text-processing.html#sec-string-constructor-string-value
// this always returns a string
JSObject.global.String.function!(self).string!
}
}