Migrate language_2/enum to NNBD.

Change-Id: I6d1045d95d0ea1c7e9a1f9fa8524687ed4dd8480
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142562
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>

tests/language/enum/duplicate_lib.dart

@@ -0,0 +1,14 @@
+// Copyright (c) 2015, 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.
+
+library enum_duplicate_lib;
+
+enum Enum1 {
+  A,
+  B,
+}
+
+class Enum2 {
+  static Iterable get values => ['Enum2.A', 'Enum2.B'];
+}

tests/language/enum/duplicate_test.dart

@@ -0,0 +1,29 @@
+// Copyright (c) 2015, 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.
+
+// Test for duplicate enums.
+
+library enum_duplicate_test;
+
+import 'package:expect/expect.dart';
+
+import 'duplicate_lib.dart' as lib; //# 01: ok
+import 'duplicate_lib.dart' as lib; //# 02: ok
+
+enum Enum1 {
+  A,
+  B,
+}
+
+enum Enum2 {
+  A,
+  B,
+}
+
+main() {
+  Expect.equals('Enum1.A,Enum1.B', Enum1.values.join(','));
+  Expect.equals('Enum1.A,Enum1.B', lib.Enum1.values.join(',')); //# 01: continued
+  Expect.equals('Enum2.A,Enum2.B', Enum2.values.join(','));
+  Expect.equals('Enum2.A,Enum2.B', lib.Enum2.values.join(',')); //# 02: continued
+}

tests/language/enum/enum_test.dart

@@ -0,0 +1,153 @@
+// Copyright (c) 2014, 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.
+
+import 'package:expect/expect.dart';
+
+enum Enum1 { _ }
+enum Enum2 { A }
+enum Enum3 { B, C }
+enum Enum4 {
+  D,
+  E,
+}
+enum Enum5 { F, G, H }
+enum _Enum6 { I, _J }
+
+enum _IsNot { IsNot }
+
+// Regression test for https://github.com/dart-lang/sdk/issues/33348
+enum JSFunctionPrototype {
+  length,
+  prototype,
+  __proto__,
+  arguments,
+  caller,
+  calee,
+  name,
+  constructor,
+  apply,
+  bind,
+  call
+}
+
+void expectIs<T>(T t, bool Function(Object?) test) {
+  Object? obj = t;
+  Expect.isTrue(test(obj), '$obj is $T');
+  Expect.isFalse(obj is _IsNot, '$obj is _IsNot');
+  // test cast
+  t = obj as T;
+  Expect.throwsTypeError(() => obj as _IsNot, '$obj as _IsNot');
+}
+
+main() {
+  expectIs(Enum1._, (e) => e is Enum1);
+  expectIs(Enum2.A, (e) => e is Enum2);
+  expectIs(Enum3.B, (e) => e is Enum3);
+  expectIs(Enum4.E, (e) => e is Enum4);
+  expectIs(Enum5.G, (e) => e is Enum5);
+
+  Expect.equals('Enum1._', Enum1._.toString());
+  Expect.equals(0, Enum1._.index);
+  Expect.listEquals([Enum1._], Enum1.values);
+  Enum1.values.forEach(test1);
+
+  Expect.equals('Enum2.A', Enum2.A.toString());
+  Expect.equals(0, Enum2.A.index);
+  Expect.listEquals([Enum2.A], Enum2.values);
+  Expect.identical(const <Enum2>[Enum2.A], Enum2.values);
+  Enum2.values.forEach(test2);
+
+  Expect.equals('Enum3.B', Enum3.B.toString());
+  Expect.equals('Enum3.C', Enum3.C.toString());
+  Expect.equals(0, Enum3.B.index);
+  Expect.equals(1, Enum3.C.index);
+  Expect.listEquals([Enum3.B, Enum3.C], Enum3.values);
+  Enum3.values.forEach(test3);
+
+  Expect.equals('Enum4.D', Enum4.D.toString());
+  Expect.equals('Enum4.E', Enum4.E.toString());
+  Expect.equals(0, Enum4.D.index);
+  Expect.equals(1, Enum4.E.index);
+  Expect.listEquals([Enum4.D, Enum4.E], Enum4.values);
+  Enum4.values.forEach(test4);
+
+  Expect.equals('Enum5.F', Enum5.F.toString());
+  Expect.equals('Enum5.G', Enum5.G.toString());
+  Expect.equals('Enum5.H', Enum5.H.toString());
+  Expect.equals(0, Enum5.F.index);
+  Expect.equals(1, Enum5.G.index);
+  Expect.equals(2, Enum5.H.index);
+  Expect.listEquals([Enum5.F, Enum5.G, Enum5.H], Enum5.values);
+  Enum5.values.forEach(test5);
+
+  Expect.equals('_Enum6.I', _Enum6.I.toString());
+  Expect.equals('_Enum6._J', _Enum6._J.toString());
+
+  for (var value in JSFunctionPrototype.values) {
+    expectIs(value, (e) => e is JSFunctionPrototype);
+  }
+  Expect.equals(JSFunctionPrototype.length, JSFunctionPrototype.values[0]);
+}
+
+test1(Enum1 e) {
+  int index;
+  switch (e) {
+    case Enum1._:
+      index = 0;
+      break;
+  }
+  Expect.equals(e.index, index);
+}
+
+test2(Enum2 e) {
+  int index;
+  switch (e) {
+    case Enum2.A:
+      index = 0;
+      break;
+  }
+  Expect.equals(e.index, index);
+}
+
+test3(Enum3 e) {
+  int index;
+  switch (e) {
+    case Enum3.C:
+      index = 1;
+      break;
+    case Enum3.B:
+      index = 0;
+      break;
+  }
+  Expect.equals(e.index, index);
+}
+
+test4(Enum4 e) {
+  int index;
+  switch (e) {
+    case Enum4.D:
+      index = 0;
+      break;
+    case Enum4.E:
+      index = 1;
+      break;
+  }
+  Expect.equals(e.index, index);
+}
+
+test5(Enum5 e) {
+  int index;
+  switch (e) {
+    case Enum5.H:
+      index = 2;
+      break;
+    case Enum5.F:
+      index = 0;
+      break;
+    case Enum5.G:
+      index = 1;
+      break;
+  }
+  Expect.equals(e.index, index);
+}

tests/language/enum/index_test.dart

@@ -0,0 +1,28 @@
+// Copyright (c) 2015, 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.
+
+// Test index access for enums.
+
+library enum_index_test;
+
+import 'package:expect/expect.dart';
+
+enum Enum {
+  A,
+  B,
+}
+
+class Class {
+  var index;
+}
+
+main() {
+  test(null, new Class());
+  test(0, Enum.A);
+  test(1, Enum.B);
+}
+
+test(expected, object) {
+  Expect.equals(expected, object.index);
+}

tests/language/enum/initialization_near_stack_overflow_test.dart

@@ -0,0 +1,33 @@
+// Copyright (c) 2018, 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.
+
+// https://github.com/flutter/flutter/issues/25041
+
+// This test may produce a compile time exception from stack overflow during
+// enum initialization or succeed in enum initialization depending on exactly
+// how much stack is left and used by the compiler. It should never crash nor
+// produce a runtime exception.
+
+enum Fruit {
+  apple,
+  banana,
+}
+
+getFruit() => Fruit.apple;
+
+recurse() {
+  try {
+    recurse();
+  } catch (e, st) {
+    print("$e ${getFruit()}");
+  }
+}
+
+main() {
+  try {
+    recurse();
+  } on StackOverflowError catch (e) {
+    // Swallow.
+  }
+}

tests/language/enum/is_keyword_runtime_test.dart

@@ -0,0 +1,13 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2015, 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.
+
+// Test that `enum` is considered a keyword and therefore invalid as the name of
+// declarations.
+
+main() {
+
+}

tests/language/enum/is_keyword_test.dart

@@ -0,0 +1,13 @@
+// Copyright (c) 2015, 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.
+
+// Test that `enum` is considered a keyword and therefore invalid as the name of
+// declarations.
+
+main() {
+  var enum;
+  //  ^^^^
+  // [analyzer] SYNTACTIC_ERROR.MISSING_IDENTIFIER
+  // [cfe] Expected an identifier, but got 'enum'.
+}

tests/language/enum/private_lib.dart

@@ -0,0 +1,10 @@
+// Copyright (c) 2015, 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.
+
+library enum_private_lib;
+
+enum Enum2 {
+  _A,
+  _B,
+}

tests/language/enum/private_runtime_1_test.dart

@@ -0,0 +1,25 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2015, 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.
+
+// Test privacy issue for enums.
+
+library enum_private_test;
+
+import 'package:expect/expect.dart';
+
+import 'private_lib.dart';
+
+enum Enum1 {
+  _A,
+  _B,
+}
+
+main() {
+  Expect.equals('Enum1._A,Enum1._B', Enum1.values.join(','));
+  Expect.equals('Enum2._A,Enum2._B', Enum2.values.join(','));
+
+}

tests/language/enum/private_runtime_test.dart

@@ -0,0 +1,25 @@
+// TODO(multitest): This was automatically migrated from a multitest and may
+// contain strange or dead code.
+
+// Copyright (c) 2015, 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.
+
+// Test privacy issue for enums.
+
+library enum_private_test;
+
+import 'package:expect/expect.dart';
+
+import 'private_lib.dart';
+
+enum Enum1 {
+  _A,
+  _B,
+}
+
+main() {
+  Expect.equals('Enum1._A,Enum1._B', Enum1.values.join(','));
+
+
+}

tests/language/enum/private_test.dart

@@ -0,0 +1,25 @@
+// Copyright (c) 2015, 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.
+
+// Test privacy issue for enums.
+
+library enum_private_test;
+
+import 'package:expect/expect.dart';
+
+import 'private_lib.dart';
+
+enum Enum1 {
+  _A,
+  _B,
+}
+
+main() {
+  Expect.equals('Enum1._A,Enum1._B', Enum1.values.join(','));
+  Expect.equals('Enum2._A,Enum2._B', Enum2.values.join(','));
+  Expect.throwsNoSuchMethodError(() => Enum2._A);
+  //                                         ^^
+  // [analyzer] STATIC_TYPE_WARNING.UNDEFINED_ENUM_CONSTANT
+  // [cfe] Getter not found: '_A'.
+}

tests/language/enum/syntax_test.dart

@@ -0,0 +1,71 @@
+// Copyright (c) 2014, 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.
+
+// Basic syntax test for enumeration types
+
+enum Color { red, orange, yellow, green }
+
+// Additional comma at end of list is ok.
+enum Veggies {
+  carrot,
+  bean,
+  broccolo,
+}
+
+// Need at least one enumeration identifier.
+enum Nada {} // //# 01: syntax error
+
+// Duplicate entries are a compile-time error
+enum ComeAgain { ahau, knust, zipfel, knust, gupf } // //# 02: compile-time error
+
+// Enum entries must not collide with implicitly defined members.
+enum ComeAgain { ahau, knust, zipfel, index } //# 03: compile-time error
+
+enum ComeAgain { ahau, knust, zipfel, values } //# 04: compile-time error
+
+enum ComeAgain { ahau, knust, zipfel, toString } //# 05: compile-time error
+
+// Enum entry must not collide with enum type name.
+enum ComeAgain { ahau, knust, zipfel, ComeAgain } //# 06: compile-time error
+
+// Missing comma.
+enum Numbers { one, two, three four, five } // //# 07: syntax error
+
+// Missing enum type name.
+enum { eins, zwei, drei } // //# 08: syntax error
+
+// Duplicate name in library scope.
+topLevelFunction() => null;
+enum topLevelFunction { bla, blah } // //# 09: compile-time error
+
+class C {}
+enum C { bla, blah } // //# 10: compile-time error
+
+var zzTop;
+enum zzTop { Billy, Dusty, Frank } // //# 11: compile-time error
+
+// Enum type cannot be super type or interface type.
+class Rainbow extends Color {} // //# 20: compile-time error
+class Rainbow implements Color {} // //# 21: compile-time error
+class Rainbow extends List with Color {} // //# 22: compile-time error
+
+main() {
+  Nada x; //# 01: continued
+  var x = ComeAgain.zipfel; // //# 02: continued
+  var x = ComeAgain.zipfel; // //# 03: continued
+  var x = ComeAgain.zipfel; // //# 04: continued
+  var x = ComeAgain.zipfel; // //# 05: continued
+  var x = ComeAgain.zipfel; // //# 06: continued
+  var x = Numbers.four; // //# 07: continued
+  var x = topLevelFunction.bla; // //# 09: continued
+  var x = C.bla; // //# 10: continued
+  var x = zzTop.Frank; // //# 11: continued
+
+  var x = new Rainbow(); // //# 20: continued
+  var x = new Rainbow(); // //# 21: continued
+  var x = new Rainbow(); // //# 22: continued
+
+  // It is a compile-time error to explicitly instantiate an enum instance.
+  var x = new Color(); // //# 30: compile-time error
+}

tests/language/enum/value_name_test.dart

@@ -0,0 +1,11 @@
+// Copyright (c) 2016, 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.
+
+import 'package:expect/expect.dart';
+
+enum ErrorContext { general, name, description, targets }
+
+void main() {
+  Expect.equals(ErrorContext.name, ErrorContext.name);
+}