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JSPromise.swift
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165 lines (148 loc) · 6.74 KB
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/// A wrapper around [the JavaScript `Promise` class](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)
public final class JSPromise: JSBridgedClass {
/// The underlying JavaScript `Promise` object.
public let jsObject: JSObject
/// The underlying JavaScript `Promise` object wrapped as `JSValue`.
public func jsValue() -> JSValue {
.object(jsObject)
}
public static var constructor: JSFunction? {
JSObject.global.Promise.function!
}
/// This private initializer assumes that the passed object is a JavaScript `Promise`
public init(unsafelyWrapping object: JSObject) {
jsObject = object
}
/// Creates a new `JSPromise` instance from a given JavaScript `Promise` object. If `jsObject`
/// is not an instance of JavaScript `Promise`, this initializer will return `nil`.
public convenience init?(_ jsObject: JSObject) {
self.init(from: jsObject)
}
/// Creates a new `JSPromise` instance from a given JavaScript `Promise` object. If `value`
/// is not an object and is not an instance of JavaScript `Promise`, this function will
/// return `nil`.
public static func construct(from value: JSValue) -> Self? {
guard case let .object(jsObject) = value else { return nil }
return Self(jsObject)
}
/// Creates a new `JSPromise` instance from a given `resolver` closure.
/// The closure is passed a completion handler. Passing a successful
/// `Result` to the completion handler will cause the promise to resolve
/// with the corresponding value; passing a failure `Result` will cause the
/// promise to reject with the corresponding value.
/// Calling the completion handler more than once will have no effect
/// (per the JavaScript specification).
public convenience init(resolver: @escaping (@escaping (Result<JSValue, JSValue>) -> Void) -> Void) {
let closure = JSOneshotClosure { arguments in
// The arguments are always coming from the `Promise` constructor, so we should be
// safe to assume their type here
let resolve = arguments[0].function!
let reject = arguments[1].function!
resolver {
switch $0 {
case let .success(success):
resolve(success)
case let .failure(error):
reject(error)
}
}
return .undefined
}
self.init(unsafelyWrapping: Self.constructor!.new(closure))
}
#if !hasFeature(Embedded)
public static func resolve(_ value: ConvertibleToJSValue) -> JSPromise {
self.init(unsafelyWrapping: Self.constructor!.resolve!(value).object!)
}
public static func reject(_ reason: ConvertibleToJSValue) -> JSPromise {
self.init(unsafelyWrapping: Self.constructor!.reject!(reason).object!)
}
#else
public static func resolve(_ value: some ConvertibleToJSValue) -> JSPromise {
self.init(unsafelyWrapping: constructor!.resolve!(value).object!)
}
public static func reject(_ reason: some ConvertibleToJSValue) -> JSPromise {
self.init(unsafelyWrapping: constructor!.reject!(reason).object!)
}
#endif
#if !hasFeature(Embedded)
/// Schedules the `success` closure to be invoked on successful completion of `self`.
@discardableResult
public func then(success: @escaping (JSValue) -> ConvertibleToJSValue) -> JSPromise {
let closure = JSOneshotClosure {
success($0[0]).jsValue
}
return JSPromise(unsafelyWrapping: jsObject.then!(closure).object!)
}
#if compiler(>=5.5)
/// Schedules the `success` closure to be invoked on successful completion of `self`.
@available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@discardableResult
public func then(success: @escaping (JSValue) async throws -> ConvertibleToJSValue) -> JSPromise {
let closure = JSOneshotClosure.async {
try await success($0[0]).jsValue
}
return JSPromise(unsafelyWrapping: jsObject.then!(closure).object!)
}
#endif
/// Schedules the `success` closure to be invoked on successful completion of `self`.
@discardableResult
public func then(
success: @escaping (JSValue) -> ConvertibleToJSValue,
failure: @escaping (JSValue) -> ConvertibleToJSValue
) -> JSPromise {
let successClosure = JSOneshotClosure {
success($0[0]).jsValue
}
let failureClosure = JSOneshotClosure {
failure($0[0]).jsValue
}
return JSPromise(unsafelyWrapping: jsObject.then!(successClosure, failureClosure).object!)
}
#if compiler(>=5.5)
/// Schedules the `success` closure to be invoked on successful completion of `self`.
@available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@discardableResult
public func then(success: @escaping (JSValue) async throws -> ConvertibleToJSValue,
failure: @escaping (JSValue) async throws -> ConvertibleToJSValue) -> JSPromise
{
let successClosure = JSOneshotClosure.async {
try await success($0[0]).jsValue
}
let failureClosure = JSOneshotClosure.async {
try await failure($0[0]).jsValue
}
return JSPromise(unsafelyWrapping: jsObject.then!(successClosure, failureClosure).object!)
}
#endif
/// Schedules the `failure` closure to be invoked on rejected completion of `self`.
@discardableResult
public func `catch`(failure: @escaping (JSValue) -> ConvertibleToJSValue) -> JSPromise {
let closure = JSOneshotClosure {
failure($0[0]).jsValue
}
return .init(unsafelyWrapping: jsObject.catch!(closure).object!)
}
#if compiler(>=5.5)
/// Schedules the `failure` closure to be invoked on rejected completion of `self`.
@available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
@discardableResult
public func `catch`(failure: @escaping (JSValue) async throws -> ConvertibleToJSValue) -> JSPromise {
let closure = JSOneshotClosure.async {
try await failure($0[0]).jsValue
}
return .init(unsafelyWrapping: jsObject.catch!(closure).object!)
}
#endif
/// Schedules the `failure` closure to be invoked on either successful or rejected
/// completion of `self`.
@discardableResult
public func finally(successOrFailure: @escaping () -> Void) -> JSPromise {
let closure = JSOneshotClosure { _ in
successOrFailure()
return .undefined
}
return .init(unsafelyWrapping: jsObject.finally!(closure).object!)
}
#endif
}