swift-mirror/test/refactoring/ConvertAsync/convert_function.swift

enum CustomError : Error {
  case Bad
}

func simple(_ completion: (String) -> Void) { }
func simple2(arg: String, _ completion: (String) -> Void) { }
func simpleErr(arg: String, _ completion: (String?, Error?) -> Void) { }
func simpleRes(arg: String, _ completion: (Result<String, Error>) -> Void) { }
func run(block: () -> Bool) -> Bool { return false }

// RUN: %refactor -convert-to-async -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=NESTED %s
func nested() {
  simple {
    simple2(arg: $0) { str2 in
      print(str2)
    }
  }
}
// NESTED: func nested() async {
// NESTED-NEXT: let val0 = await simple()
// NESTED-NEXT: let str2 = await simple2(arg: val0)
// NESTED-NEXT: print(str2)
// NESTED-NEXT: }

// RUN: %refactor -convert-to-async -dump-text -source-filename %s -pos=%(line+2):9 | %FileCheck -check-prefix=ATTRIBUTES %s
@available(*, deprecated, message: "Deprecated")
private func functionWithAttributes() {
  simple { str in
    print(str)
  }
}
// ATTRIBUTES: convert_function.swift [[# @LINE-6]]:1 -> [[# @LINE-1]]:2
// ATTRIBUTES-NEXT: @available(*, deprecated, message: "Deprecated")
// ATTRIBUTES-NEXT: private func functionWithAttributes() async {
// ATTRIBUTES-NEXT: let str = await simple()
// ATTRIBUTES-NEXT: print(str)
// ATTRIBUTES-NEXT: }

// RUN: %refactor -convert-to-async -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=MANY-NESTED %s
func manyNested() {
  simple { str1 in
    print("simple")
    simple2(arg: str1) { str2 in
      print("simple2")
      simpleErr(arg: str2) { str3, err in
        print("simpleErr")
        guard let str3 = str3, err == nil else {
          return
        }
        simpleRes(arg: str3) { res in
          print("simpleRes")
          if case .success(let str4) = res {
            print("\(str1) \(str2) \(str3) \(str4)")
            print("after")
          }
        }
      }
    }
  }
}
// MANY-NESTED: func manyNested() async {
// MANY-NESTED-NEXT: let str1 = await simple()
// MANY-NESTED-NEXT: print("simple")
// MANY-NESTED-NEXT: let str2 = await simple2(arg: str1)
// MANY-NESTED-NEXT: print("simple2")
// MANY-NESTED-NEXT: let str3 = try await simpleErr(arg: str2)
// MANY-NESTED-NEXT: print("simpleErr")
// MANY-NESTED-NEXT: let str4 = try await simpleRes(arg: str3)
// MANY-NESTED-NEXT: print("simpleRes")
// MANY-NESTED-NEXT: print("\(str1) \(str2) \(str3) \(str4)")
// MANY-NESTED-NEXT: print("after")
// MANY-NESTED-NEXT: }

// RUN: %refactor -add-async-alternative -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=ASYNC-SIMPLE %s
func asyncParams(arg: String, _ completion: (String?, Error?) -> Void) {
  simpleErr(arg: arg) { str, err in
    print("simpleErr")
    guard let str = str, err == nil else {
      completion(nil, err!)
      return
    }
    completion(str, nil)
    print("after")
  }
}
// ASYNC-SIMPLE: func {{[a-zA-Z_]+}}(arg: String) async throws -> String {
// ASYNC-SIMPLE-NEXT: let str = try await simpleErr(arg: arg)
// ASYNC-SIMPLE-NEXT: print("simpleErr")
// ASYNC-SIMPLE-NEXT: return str
// ASYNC-SIMPLE-NEXT: print("after")
// ASYNC-SIMPLE-NEXT: }

// RUN: %refactor -add-async-alternative -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=ASYNC-SIMPLE %s
func asyncResErrPassed(arg: String, _ completion: (Result<String, Error>) -> Void) {
  simpleErr(arg: arg) { str, err in
    print("simpleErr")
    guard let str = str, err == nil else {
      completion(.failure(err!))
      return
    }
    completion(.success(str))
    print("after")
  }
}

// RUN: %refactor -add-async-alternative -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=ASYNC-ERR %s
func asyncResNewErr(arg: String, _ completion: (Result<String, Error>) -> Void) {
  simpleErr(arg: arg) { str, err in
    print("simpleErr")
    guard let str = str, err == nil else {
      completion(.failure(CustomError.Bad))
      return
    }
    completion(.success(str))
    print("after")
  }
}
// ASYNC-ERR: func asyncResNewErr(arg: String) async throws -> String {
// ASYNC-ERR-NEXT: do {
// ASYNC-ERR-NEXT: let str = try await simpleErr(arg: arg)
// ASYNC-ERR-NEXT: print("simpleErr")
// ASYNC-ERR-NEXT: return str
// ASYNC-ERR-NEXT: print("after")
// ASYNC-ERR-NEXT: } catch let err {
// ASYNC-ERR-NEXT: throw CustomError.Bad
// ASYNC-ERR-NEXT: }
// ASYNC-ERR-NEXT: }

// RUN: %refactor -add-async-alternative -dump-text -source-filename %s -pos=%(line+1):1 | %FileCheck -check-prefix=ASYNC-UNHANDLED %s
func asyncUnhandledCompletion(_ completion: (String) -> Void) {
  simple { str in
    let success = run {
      completion(str)
      return true
    }
    if !success {
      completion("bad")
    }
  }
}
// ASYNC-UNHANDLED: func asyncUnhandledCompletion() async -> String {
// ASYNC-UNHANDLED-NEXT: let str = await simple()
// ASYNC-UNHANDLED-NEXT: let success = run {
// ASYNC-UNHANDLED-NEXT: <#completion#>(str)
// ASYNC-UNHANDLED-NEXT: return true
// ASYNC-UNHANDLED-NEXT: }
// ASYNC-UNHANDLED-NEXT: if !success {
// ASYNC-UNHANDLED-NEXT: return "bad"
// ASYNC-UNHANDLED-NEXT: }
// ASYNC-UNHANDLED-NEXT: }