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Pods/PromisesSwift/Sources/Promises/Promise+Do.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 {
+  // swiftlint:disable:next type_name
+  typealias Do<T> = () throws -> T
+
+  /// Creates a pending promise to be resolved with the return value of `work` block which is
+  /// executed asynchronously on the given `queue`.
+  /// - parameters:
+  ///   - queue: A queue to invoke the `work` block on.
+  ///   - work: A block that returns a value used to resolve the new promise.
+  convenience init<T>(on queue: DispatchQueue = .promises, _ work: @escaping Do<T>) {
+    let objCPromise = ObjCPromise<AnyObject>.__onQueue(queue) {
+      do {
+        let resolution = try work()
+        return type(of: resolution) is NSError.Type
+          ? resolution as! NSError : Promise<T>.asAnyObject(resolution)
+      } catch let error {
+        return error as NSError
+      }
+    }
+    self.init(objCPromise)
+    // Keep Swift wrapper alive for chained promise until `ObjCPromise` counterpart is resolved.
+    objCPromise.__addPendingObject(self)
+  }
+
+  /// Creates a pending promise to be resolved with the same resolution as the promise returned from
+  /// `work` block which is executed asynchronously on the given `queue`.
+  /// - parameters:
+  ///   - queue: A queue to invoke the `work` block on.
+  ///   - work: A block that returns a promise used to resolve the new promise.
+  convenience init<T>(
+    on queue: DispatchQueue = .promises,
+    _ work: @escaping Do<Promise<T>>
+  ) {
+    let objCPromise = ObjCPromise<AnyObject>.__onQueue(queue) {
+      do {
+        return try work().objCPromise
+      } catch let error {
+        return error as NSError
+      }
+    }
+    self.init(objCPromise)
+    // Keep Swift wrapper alive for chained promise until `ObjCPromise` counterpart is resolved.
+    objCPromise.__addPendingObject(self)
+  }
+}