Reflection on generics.

tests/lib/mirrors/generics_test.dart

+// Copyright (c) 2013, 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 test.type_arguments_test;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class A<T> {}
+class B extends A {}            // Same as class B extends A<dynamic>.
+class C extends A<num, int> {}  // Same as class C extends A<dynamic>.
+class D extends A<int> {}
+class E<S> extends A<S> {}
+class F<R> extends A<int> {}
+class G {}
+
+typeParameters(mirror, parameterNames) {
+  Expect.listEquals(parameterNames.map((n) => new Symbol(n)).toList(),
+                    mirror.typeVariables.keys.toList());
+}
+
+typeArguments(mirror, argumentMirrors) {
+  Expect.listEquals(argumentMirrors,
+                    mirror.typeArguments.values.toList());
+  if (!mirror.isOriginalDeclaration) {
+    Expect.listEquals(mirror.typeVariables.keys.toList(),
+                      mirror.typeArguments.keys.toList());
+  }
+}
+
+main() {
+  // Declarations.
+  typeParameters(reflectClass(A), ['T']);
+  typeParameters(reflectClass(B), []);
+  typeParameters(reflectClass(C), []);
+  typeParameters(reflectClass(D), []);
+  typeParameters(reflectClass(E), ['S']);
+  typeParameters(reflectClass(F), ['R']);
+  typeParameters(reflectClass(G), []);
+
+  typeArguments(reflectClass(A), []);
+  typeArguments(reflectClass(B), []);
+  typeArguments(reflectClass(C), []);
+  typeArguments(reflectClass(D), []);
+  typeArguments(reflectClass(E), []);
+  typeArguments(reflectClass(F), []);
+  typeArguments(reflectClass(G), []);
+
+  Expect.isTrue(reflectClass(A).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(B).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(C).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(D).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(E).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(F).isOriginalDeclaration);
+  Expect.isTrue(reflectClass(G).isOriginalDeclaration);
+
+  Expect.equals(reflectClass(A), reflectClass(A).originalDeclaration);
+  Expect.equals(reflectClass(B), reflectClass(B).originalDeclaration);
+  Expect.equals(reflectClass(C), reflectClass(C).originalDeclaration);
+  Expect.equals(reflectClass(D), reflectClass(D).originalDeclaration);
+  Expect.equals(reflectClass(E), reflectClass(E).originalDeclaration);
+  Expect.equals(reflectClass(F), reflectClass(F).originalDeclaration);
+  Expect.equals(reflectClass(G), reflectClass(G).originalDeclaration);
+
+  // Instantiations.
+  typeParameters(reflect(new A<num>()).type, ['T']);
+  typeParameters(reflect(new B<num>()).type, []);
+  typeParameters(reflect(new C()).type, []);
+  typeParameters(reflect(new D()).type, []);
+  typeParameters(reflect(new E()).type, ['S']);
+  typeParameters(reflect(new F<num>()).type, ['R']);
+  typeParameters(reflect(new G()).type, []);
+
+  var numMirror = reflectClass(num);
+  typeArguments(reflect(new A<num>()).type, [numMirror]);
+  typeArguments(reflect(new B()).type, []);
+  typeArguments(reflect(new C()).type, []);
+  typeArguments(reflect(new D()).type, []);
+  typeArguments(reflect(new E<num>()).type, [numMirror]);
+  typeArguments(reflect(new F<num>()).type, [numMirror]);
+  typeArguments(reflect(new G()).type, []);
+
+  Expect.isFalse(reflect(new A<num>()).type.isOriginalDeclaration);
+  Expect.isTrue(reflect(new B()).type.isOriginalDeclaration);
+  Expect.isTrue(reflect(new C()).type.isOriginalDeclaration);
+  Expect.isTrue(reflect(new D()).type.isOriginalDeclaration);
+  Expect.isFalse(reflect(new E<num>()).type.isOriginalDeclaration);
+  Expect.isFalse(reflect(new F<num>()).type.isOriginalDeclaration);
+  Expect.isTrue(reflect(new G()).type.isOriginalDeclaration);
+
+  Expect.equals(reflectClass(A),
+                reflect(new A<num>()).type.originalDeclaration);
+  Expect.equals(reflectClass(B),
+                reflect(new B()).type.originalDeclaration);
+  Expect.equals(reflectClass(C),
+                reflect(new C()).type.originalDeclaration);
+  Expect.equals(reflectClass(D),
+                reflect(new D()).type.originalDeclaration);
+  Expect.equals(reflectClass(E),
+                reflect(new E<num>()).type.originalDeclaration);
+  Expect.equals(reflectClass(F),
+                reflect(new F<num>()).type.originalDeclaration);
+  Expect.equals(reflectClass(G),
+                reflect(new G()).type.originalDeclaration);
+
+  Expect.notEquals(reflect(new A<num>()).type,
+                   reflect(new A<num>()).type.originalDeclaration);
+  Expect.equals(reflect(new B()).type,
+                reflect(new B()).type.originalDeclaration);
+  Expect.equals(reflect(new C()).type,
+                reflect(new C()).type.originalDeclaration);
+  Expect.equals(reflect(new D()).type,
+                reflect(new D()).type.originalDeclaration);
+  Expect.notEquals(reflect(new E<num>()).type,
+                   reflect(new E<num>()).type.originalDeclaration);
+  Expect.notEquals(reflect(new F<num>()).type,
+                   reflect(new F<num>()).type.originalDeclaration);
+  Expect.equals(reflect(new G()).type,
+                reflect(new G()).type.originalDeclaration);
+
+  // Library members are all uninstantaited generics or non-generics.
+  currentMirrorSystem().libraries.values.forEach((libraryMirror) {
+    libraryMirror.classes.values.forEach((classMirror) {
+      // TODO(12282): Deal with generic typedefs.
+      if (classMirror is! TypedefMirror) {
+        Expect.isTrue(classMirror.isOriginalDeclaration);
+        Expect.equals(classMirror, classMirror.originalDeclaration);
+      }
+    });
+  });
+}