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Pods/PromisesSwift/Sources/Promises/Promise+Catch.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 Catch = (Error) -> Void
+
+  /// Creates a pending promise which eventually gets resolved with same resolution as `self`.
+  /// If `self` is rejected, then `reject` block is executed asynchronously on the given queue.
+  /// - parameters:
+  ///   - queue: A queue to invoke the `reject` block on.
+  ///   - reject: A block to handle the error that `self` was rejected with.
+  /// - returns: A new pending promise.
+  @discardableResult
+  func `catch`(on queue: DispatchQueue = .promises, _ reject: @escaping Catch) -> Promise {
+    let promise = Promise(objCPromise.__onQueue(queue, catch: {
+      // Convert `NSError` to `PromiseError`, if applicable.
+      let error = PromiseError($0) ?? $0
+      return reject(error as NSError)
+    }))
+    // Keep Swift wrapper alive for chained promise until `ObjCPromise` counterpart is resolved.
+    objCPromise.__addPendingObject(promise)
+    return promise
+  }
+}