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Pods/PromisesSwift/Sources/Promises/Promise+Async.swift

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+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+
+public extension Promise {
+  typealias Async = (@escaping (Value) -> Void, @escaping (Error) -> Void) throws -> Void
+
+  /// Creates a pending promise and executes `work` block asynchronously on the given `queue`.
+  /// - parameters:
+  ///   - queue: A queue to invoke the `work` block on.
+  ///   - work: A block to perform any operations needed to resolve the promise.
+  convenience init(on queue: DispatchQueue = .promises, _ work: @escaping Async) {
+    let objCPromise = ObjCPromise<AnyObject>.__onQueue(queue) { fulfill, reject in
+      do {
+        try work({ value in
+          if type(of: value) is NSError.Type {
+            reject(value as! NSError)
+          } else {
+            fulfill(Promise<Value>.asAnyObject(value))
+          }
+        }, reject)
+      } catch let error {
+        reject(error as NSError)
+      }
+    }
+    self.init(objCPromise)
+    // Keep Swift wrapper alive for chained promise until `ObjCPromise` counterpart is resolved.
+    objCPromise.__addPendingObject(self)
+  }
+}