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import _CJavaScriptKit
/// Objects that can be converted to a JavaScript value, preferably in a lossless manner.
public protocol ConvertibleToJSValue {
/// Create a JSValue that represents this object
var jsValue: JSValue { get }
}
extension ConvertibleToJSValue {
@available(*, deprecated, message: "Use the .jsValue property instead")
public func jsValue() -> JSValue { jsValue }
}
public typealias JSValueCompatible = ConvertibleToJSValue & ConstructibleFromJSValue
extension JSValue: JSValueCompatible {
public static func construct(from value: JSValue) -> Self? {
return value
}
public var jsValue: JSValue { self }
}
extension Bool: ConvertibleToJSValue {
public var jsValue: JSValue { .boolean(self) }
}
extension Int: ConvertibleToJSValue {
public var jsValue: JSValue {
assert(Self.bitWidth == 32)
return .number(Double(self))
}
}
extension UInt: ConvertibleToJSValue {
public var jsValue: JSValue {
assert(Self.bitWidth == 32)
return .number(Double(self))
}
}
extension Float: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension Double: ConvertibleToJSValue {
public var jsValue: JSValue { .number(self) }
}
extension String: ConvertibleToJSValue {
public var jsValue: JSValue { .string(JSString(self)) }
}
extension UInt8: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension UInt16: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension UInt32: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension Int8: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension Int16: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension Int32: ConvertibleToJSValue {
public var jsValue: JSValue { .number(Double(self)) }
}
extension JSString: ConvertibleToJSValue {
public var jsValue: JSValue { .string(self) }
}
extension JSObject: JSValueCompatible {
// `JSObject.jsValue` is defined in JSObject.swift to be able to overridden
// from `JSFunction`
}
private let objectConstructor = JSObject.global.Object.function!
private let arrayConstructor = JSObject.global.Array.function!
extension Dictionary where Value == ConvertibleToJSValue, Key == String {
public var jsValue: JSValue {
let object = objectConstructor.new()
for (key, value) in self {
object[key] = value.jsValue
}
return .object(object)
}
}
extension Dictionary: ConvertibleToJSValue where Value: ConvertibleToJSValue, Key == String {
public var jsValue: JSValue {
let object = objectConstructor.new()
for (key, value) in self {
object[key] = value.jsValue
}
return .object(object)
}
}
extension Dictionary: ConstructibleFromJSValue where Value: ConstructibleFromJSValue, Key == String {
public static func construct(from value: JSValue) -> Self? {
guard
let objectRef = value.object,
let keys: [String] = objectConstructor.keys!(objectRef.jsValue).fromJSValue()
else { return nil }
var entries = [(String, Value)]()
entries.reserveCapacity(keys.count)
for key in keys {
guard let value: Value = objectRef[key].fromJSValue() else {
return nil
}
entries.append((key, value))
}
return Dictionary(uniqueKeysWithValues: entries)
}
}
extension Optional: ConstructibleFromJSValue where Wrapped: ConstructibleFromJSValue {
public static func construct(from value: JSValue) -> Self? {
switch value {
case .null, .undefined:
return nil
default:
return Wrapped.construct(from: value)
}
}
}
extension Optional: ConvertibleToJSValue where Wrapped: ConvertibleToJSValue {
public var jsValue: JSValue {
switch self {
case .none: return .null
case let .some(wrapped): return wrapped.jsValue
}
}
}
extension Array: ConvertibleToJSValue where Element: ConvertibleToJSValue {
public var jsValue: JSValue {
let array = arrayConstructor.new(count)
for (index, element) in enumerated() {
array[index] = element.jsValue
}
return .object(array)
}
}
extension Array where Element == ConvertibleToJSValue {
public var jsValue: JSValue {
let array = arrayConstructor.new(count)
for (index, element) in enumerated() {
array[index] = element.jsValue
}
return .object(array)
}
}
extension Array: ConstructibleFromJSValue where Element: ConstructibleFromJSValue {
public static func construct(from value: JSValue) -> [Element]? {
guard
let objectRef = value.object,
objectRef.isInstanceOf(JSObject.global.Array.function!)
else { return nil }
let count: Int = objectRef.length.fromJSValue()!
var array = [Element]()
array.reserveCapacity(count)
for i in 0 ..< count {
guard let value: Element = objectRef[i].fromJSValue() else { return nil }
array.append(value)
}
return array
}
}
extension RawJSValue: ConvertibleToJSValue {
public var jsValue: JSValue {
switch kind {
case .boolean:
return .boolean(payload1 != 0)
case .number:
return .number(payload2)
case .string:
return .string(JSString(jsRef: payload1))
case .object:
return .object(JSObject(id: UInt32(payload1)))
case .null:
return .null
case .undefined:
return .undefined
case .function:
return .function(JSFunction(id: UInt32(payload1)))
case .symbol:
return .symbol(JSSymbol(id: UInt32(payload1)))
case .bigInt:
return .bigInt(JSBigInt(id: UInt32(payload1)))
}
}
}
extension JSValue {
func withRawJSValue<T>(_ body: (RawJSValue) -> T) -> T {
let kind: JavaScriptValueKind
let payload1: JavaScriptPayload1
var payload2: JavaScriptPayload2 = 0
switch self {
case let .boolean(boolValue):
kind = .boolean
payload1 = boolValue ? 1 : 0
case let .number(numberValue):
kind = .number
payload1 = 0
payload2 = numberValue
case let .string(string):
return string.withRawJSValue(body)
case let .object(ref):
kind = .object
payload1 = JavaScriptPayload1(ref.id)
case .null:
kind = .null
payload1 = 0
case .undefined:
kind = .undefined
payload1 = 0
case let .function(functionRef):
kind = .function
payload1 = JavaScriptPayload1(functionRef.id)
case let .symbol(symbolRef):
kind = .symbol
payload1 = JavaScriptPayload1(symbolRef.id)
case let .bigInt(bigIntRef):
kind = .bigInt
payload1 = JavaScriptPayload1(bigIntRef.id)
}
let rawValue = RawJSValue(kind: kind, payload1: payload1, payload2: payload2)
return body(rawValue)
}
}
extension Array where Element == ConvertibleToJSValue {
func withRawJSValues<T>(_ body: ([RawJSValue]) -> T) -> T {
// fast path for empty array
guard self.count != 0 else { return body([]) }
func _withRawJSValues(
_ values: [ConvertibleToJSValue], _ index: Int,
_ results: inout [RawJSValue], _ body: ([RawJSValue]) -> T
) -> T {
if index == values.count { return body(results) }
return values[index].jsValue.withRawJSValue { (rawValue) -> T in
results.append(rawValue)
return _withRawJSValues(values, index + 1, &results, body)
}
}
var _results = [RawJSValue]()
return _withRawJSValues(self, 0, &_results, body)
}
}
extension Array where Element: ConvertibleToJSValue {
func withRawJSValues<T>(_ body: ([RawJSValue]) -> T) -> T {
[ConvertibleToJSValue].withRawJSValues(self)(body)
}
}