Language/Types/Function_Types/subtype_optional_args_t02.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion A function type (T1,...Tk,[Tk+1,...,Tn+m]) -> T is a subtype of
/// the function type (S1,...,Sk+j,[Sk+j+1,...,Sn]) -> S, if all of the following
/// conditions are met:
/// 1. Either
///    • S is void, or
///    • T <=> S.
/// 2. ∀i ∈ 1..n, Ti ⇐⇒ Si.
/// @description Checks that this statement is true for functions with several
/// positional optional parameters (class, generic, function, Dynamic).
/// @author iefremov

import "../../../Utils/expect.dart";

class A {}

class A1 {}

class A2 {}

class B implements A, A1, A2 {}

class C implements B {}

class D implements C {}

class G<T, S, U, W> {}

typedef classesFunc([A? a, B? b, C? c, D? d]);
typedef genericsFunc([Map<num, int>? m, List<List<B>>? l, G<A, B, C, D>? g]);
typedef dynamicFunc([var x, var y, var z, var v]);
typedef funcFunc([classesFunc? f1, genericsFunc? f2, dynamicFunc? f3]);
typedef mixFunc([var x, B? b, G<A, B, C, D>? g, funcFunc? f]);

typedef okWithClassesFunc_1([A? a, A1? b, A1? c, A1? d]);
typedef okWithClassesFunc_2([D? a, D? b, D? c, D? d]);

typedef okWithGenericsFunc_1(
    [Map<num, num>? m, List<List<A1>>? l, G<A, A1, A1, A1>? g]);
typedef okWithGenericsFunc_2(
    [Map<int, int>? m, List<List<D>>? l, G<D, D, D, D>? g]);

typedef okWithDynamicFunc_1([A x, G y, mixFunc z, var v]);
typedef okWithDynamicFunc_2([int? x, bool? y, List<Map>? z, classesFunc? v]);

main() {
  Expect.isFalse(([D? a, B? b, C? c, A? d]) {} is classesFunc);
  Expect.isTrue(([A? a, A? b, A? c, A? d]) {} is classesFunc);
  Expect.isFalse(([D? a, A1? b, A1? c, A1? d]) {} is classesFunc);
  Expect.isFalse(([D? a, A2? b, A2? c, A2? d]) {} is classesFunc);
  Expect.isFalse(([D? a, D? b, D? c, D? d]) {} is classesFunc);
  Expect.isTrue(([var a, var b, var c, var d]) {} is classesFunc);
  Expect.isTrue(
      ([Object? a, Object? b, Object? c, Object? d]) {} is classesFunc);
  Expect.runtimeIsNotType<classesFunc>(([D? a, B? b, C? c, A? d]) {});
  Expect.runtimeIsType<classesFunc>(([A? a, A? b, A? c, A? d]) {});
  Expect.runtimeIsNotType<classesFunc>(([D? a, A1? b, A1? c, A1? d]) {});
  Expect.runtimeIsNotType<classesFunc>(([D? a, A2? b, A2? c, A2? d]) {});
  Expect.runtimeIsNotType<classesFunc>(([D? a, D? b, D? c, D? d]) {});
  Expect.runtimeIsType<classesFunc>(([var a, var b, var c, var d]) {});
  Expect.runtimeIsType<classesFunc>(
      ([Object? a, Object? b, Object? c, Object? d]) {});

  Expect.isTrue(([Map<num, num>? m, List<List<A1>>? l, G<A, A1, A1, A1>? g]) {}
      is genericsFunc);
  Expect.isFalse(([Map<int, int>? m, List<List<D>>? l, G<D, D, D, D>? g]) {}
      is genericsFunc);
  Expect.isTrue(([var m, var l, var g]) {} is genericsFunc);
  Expect.isTrue(([Object? m, Object? l, Object? g]) {} is genericsFunc);
  Expect.runtimeIsType<genericsFunc>(
      ([Map<num, num>? m, List<List<A1>>? l, G<A, A1, A1, A1>? g]) {});
  Expect.runtimeIsNotType<genericsFunc>(
      ([Map<int, int>? m, List<List<D>>? l, G<D, D, D, D>? g]) {});

  Expect.runtimeIsType<genericsFunc>(([var m, var l, var g]) {});
  Expect.runtimeIsType<genericsFunc>(([Object? m, Object? l, Object? g]) {});

  Expect.isFalse(([A? x, G? y, mixFunc? z, var v]) {} is dynamicFunc);
  Expect.isFalse(
      ([int? x, bool? y, List<Map>? z, classesFunc? v]) {} is dynamicFunc);
  Expect.runtimeIsNotType<dynamicFunc>(([A? x, G? y, mixFunc? z, var v]) {});
  Expect.runtimeIsNotType<dynamicFunc>(
      ([int? x, bool? y, List<Map>? z, classesFunc? v]) {});

  Expect.isFalse((
      [okWithClassesFunc_1? f1,
      okWithGenericsFunc_1? f2,
      okWithDynamicFunc_1? f3]) {} is funcFunc);
  Expect.isTrue((
      [okWithClassesFunc_2? f1,
      okWithGenericsFunc_2? f2,
      okWithDynamicFunc_2? f3]) {} is funcFunc);
  Expect.runtimeIsNotType<funcFunc>((
      [okWithClassesFunc_1? f1,
      okWithGenericsFunc_1? f2,
      okWithDynamicFunc_1? f3]) {});
  Expect.runtimeIsType<funcFunc>((
      [okWithClassesFunc_2? f1,
      okWithGenericsFunc_2? f2,
      okWithDynamicFunc_2? f3]) {});
}