Add TypeMirror.isSubtypeOf, TypeMirror.isAssignableTo, ClassMirror.isSubclassOf

tests/lib/mirrors/relation_subtype_test.dart

Index: tests/lib/mirrors/relation_subtype_test.dart
diff --git a/tests/lib/mirrors/relation_subtype_test.dart b/tests/lib/mirrors/relation_subtype_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9504c8cc4ed7bc1b487f8315047b53447d5eeb0b
--- /dev/null
+++ b/tests/lib/mirrors/relation_subtype_test.dart
@@ -0,0 +1,303 @@
+// 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.
+
+library test.relation_subtype;
+
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+class Superclass {}
+class Subclass1 extends Superclass {}
+class Subclass2 extends Superclass {}
+
+typedef bool NumberPredicate(num x);
+typedef bool IntegerPredicate(int x);
+typedef bool DoublePredicate(double x);
+
+typedef num NumberGenerator();
+typedef int IntegerGenerator();
+typedef double DoubleGenerator();
+
+class A<T> {}
+class B<T> extends A<T> {}
+class C<T extends num> {}
+
+test(MirrorSystem mirrors) {
+  LibraryMirror coreLibrary = mirrors.findLibrary(#dart.core);
+  LibraryMirror thisLibrary = mirrors.findLibrary(#test.relation_subtype);
+
+  // Classes.
+  TypeMirror Super = thisLibrary.declarations[#Superclass];
+  TypeMirror Sub1 = thisLibrary.declarations[#Subclass1];
+  TypeMirror Sub2 = thisLibrary.declarations[#Subclass2];
+  TypeMirror Obj = coreLibrary.declarations[#Object];
+
+  Expect.isTrue(Obj.isSubtypeOf(Obj));
+  Expect.isTrue(Super.isSubtypeOf(Super));
+  Expect.isTrue(Sub1.isSubtypeOf(Sub1));
+  Expect.isTrue(Sub2.isSubtypeOf(Sub2));
+
+  Expect.isTrue(Sub1.isSubtypeOf(Super));
+  Expect.isFalse(Super.isSubtypeOf(Sub1));
+
+  Expect.isTrue(Sub2.isSubtypeOf(Super));
+  Expect.isFalse(Super.isSubtypeOf(Sub2));
+
+  Expect.isFalse(Sub2.isSubtypeOf(Sub1));
+  Expect.isFalse(Sub1.isSubtypeOf(Sub2));
+
+  Expect.isTrue(Sub1.isSubtypeOf(Obj));
+  Expect.isFalse(Obj.isSubtypeOf(Sub1));
+
+  Expect.isTrue(Sub2.isSubtypeOf(Obj));
+  Expect.isFalse(Obj.isSubtypeOf(Sub2));
+
+  Expect.isTrue(Super.isSubtypeOf(Obj));
+  Expect.isFalse(Obj.isSubtypeOf(Super));
+
+
+  // Function typedef - argument type.
+  TypeMirror Func = coreLibrary.declarations[#Function];
+  TypedefMirror NumPred = thisLibrary.declarations[#NumberPredicate];
+  TypedefMirror IntPred = thisLibrary.declarations[#IntegerPredicate];
+  TypedefMirror DubPred = thisLibrary.declarations[#DoublePredicate];
+
+  Expect.isTrue(Func.isSubtypeOf(Func));
+  Expect.isTrue(NumPred.isSubtypeOf(NumPred));
+  Expect.isTrue(IntPred.isSubtypeOf(IntPred));
+  Expect.isTrue(DubPred.isSubtypeOf(DubPred));
+
+  Expect.isTrue(NumPred.isSubtypeOf(Func));
+  Expect.isTrue(NumPred.isSubtypeOf(IntPred));
+  Expect.isTrue(NumPred.isSubtypeOf(DubPred));
+
+  Expect.isTrue(IntPred.isSubtypeOf(Func));
+  Expect.isTrue(IntPred.isSubtypeOf(NumPred));
+  Expect.isFalse(IntPred.isSubtypeOf(DubPred));
+
+  Expect.isTrue(DubPred.isSubtypeOf(Func));
+  Expect.isTrue(DubPred.isSubtypeOf(NumPred));
+  Expect.isFalse(DubPred.isSubtypeOf(IntPred));
+
+  Expect.isTrue(Func.isSubtypeOf(Obj));
+  Expect.isTrue(NumPred.isSubtypeOf(Obj));
+  Expect.isTrue(IntPred.isSubtypeOf(Obj));
+  Expect.isTrue(DubPred.isSubtypeOf(Obj));
+
+
+  // Function typedef - return type.
+  TypedefMirror NumGen = thisLibrary.declarations[#NumberGenerator];
+  TypedefMirror IntGen = thisLibrary.declarations[#IntegerGenerator];
+  TypedefMirror DubGen = thisLibrary.declarations[#DoubleGenerator];
+
+  Expect.isTrue(NumGen.isSubtypeOf(NumGen));
+  Expect.isTrue(IntGen.isSubtypeOf(IntGen));
+  Expect.isTrue(DubGen.isSubtypeOf(DubGen));
+
+  Expect.isTrue(NumGen.isSubtypeOf(Func));
+  Expect.isTrue(NumGen.isSubtypeOf(IntGen));
+  Expect.isTrue(NumGen.isSubtypeOf(DubGen));
+
+  Expect.isTrue(IntGen.isSubtypeOf(Func));
+  Expect.isTrue(IntGen.isSubtypeOf(NumGen));
+  Expect.isFalse(IntGen.isSubtypeOf(DubGen));
+
+  Expect.isTrue(DubGen.isSubtypeOf(Func));
+  Expect.isTrue(DubGen.isSubtypeOf(NumGen));
+  Expect.isFalse(DubGen.isSubtypeOf(IntGen));
+
+  Expect.isTrue(Func.isSubtypeOf(Obj));
+  Expect.isTrue(NumGen.isSubtypeOf(Obj));
+  Expect.isTrue(IntGen.isSubtypeOf(Obj));
+  Expect.isTrue(DubGen.isSubtypeOf(Obj));
+
+  
+  // Function - argument type.
+  TypeMirror NumPredRef = NumPred.referent;
+  TypeMirror IntPredRef = IntPred.referent;
+  TypeMirror DubPredRef = DubPred.referent;
+
+  Expect.isTrue(Func.isSubtypeOf(Func));
+  Expect.isTrue(NumPredRef.isSubtypeOf(NumPredRef));
+  Expect.isTrue(IntPredRef.isSubtypeOf(IntPredRef));
+  Expect.isTrue(DubPredRef.isSubtypeOf(DubPredRef));
+
+  Expect.isTrue(NumPredRef.isSubtypeOf(Func));
+  Expect.isTrue(NumPredRef.isSubtypeOf(IntPredRef));
+  Expect.isTrue(NumPredRef.isSubtypeOf(DubPredRef));
+
+  Expect.isTrue(IntPredRef.isSubtypeOf(Func));
+  Expect.isTrue(IntPredRef.isSubtypeOf(NumPredRef));
+  Expect.isFalse(IntPredRef.isSubtypeOf(DubPredRef));
+
+  Expect.isTrue(DubPredRef.isSubtypeOf(Func));
+  Expect.isTrue(DubPredRef.isSubtypeOf(NumPredRef));
+  Expect.isFalse(DubPredRef.isSubtypeOf(IntPredRef));
+
+  Expect.isTrue(Func.isSubtypeOf(Obj));
+  Expect.isTrue(NumPredRef.isSubtypeOf(Obj));
+  Expect.isTrue(IntPredRef.isSubtypeOf(Obj));
+  Expect.isTrue(DubPredRef.isSubtypeOf(Obj));
+
+
+  // Function - return type.
+  TypeMirror NumGenRef = NumGen.referent;
+  TypeMirror IntGenRef = IntGen.referent;
+  TypeMirror DubGenRef = DubGen.referent;
+
+  Expect.isTrue(NumGenRef.isSubtypeOf(NumGenRef));
+  Expect.isTrue(IntGenRef.isSubtypeOf(IntGenRef));
+  Expect.isTrue(DubGenRef.isSubtypeOf(DubGenRef));
+
+  Expect.isTrue(NumGenRef.isSubtypeOf(Func));
+  Expect.isTrue(NumGenRef.isSubtypeOf(IntGenRef));
+  Expect.isTrue(NumGenRef.isSubtypeOf(DubGenRef));
+
+  Expect.isTrue(IntGenRef.isSubtypeOf(Func));
+  Expect.isTrue(IntGenRef.isSubtypeOf(NumGenRef));
+  Expect.isFalse(IntGenRef.isSubtypeOf(DubGenRef));
+
+  Expect.isTrue(DubGenRef.isSubtypeOf(Func));
+  Expect.isTrue(DubGenRef.isSubtypeOf(NumGenRef));
+  Expect.isFalse(DubGenRef.isSubtypeOf(IntGenRef));
+
+  Expect.isTrue(Func.isSubtypeOf(Obj));
+  Expect.isTrue(NumGenRef.isSubtypeOf(Obj));
+  Expect.isTrue(IntGenRef.isSubtypeOf(Obj));
+  Expect.isTrue(DubGenRef.isSubtypeOf(Obj));
+
+
+  // Function typedef / function.
+  Expect.isTrue(NumPred.isSubtypeOf(NumPredRef));
+  Expect.isTrue(IntPred.isSubtypeOf(IntPredRef));
+  Expect.isTrue(DubPred.isSubtypeOf(DubPredRef));
+  Expect.isTrue(NumPredRef.isSubtypeOf(NumPred));
+  Expect.isTrue(IntPredRef.isSubtypeOf(IntPred));
+  Expect.isTrue(DubPredRef.isSubtypeOf(DubPred));
+
+
+  // Function typedef / function.
+  Expect.isTrue(NumGen.isSubtypeOf(NumGenRef));
+  Expect.isTrue(IntGen.isSubtypeOf(IntGenRef));
+  Expect.isTrue(DubGen.isSubtypeOf(DubGenRef));
+  Expect.isTrue(NumGenRef.isSubtypeOf(NumGen));
+  Expect.isTrue(IntGenRef.isSubtypeOf(IntGen));
+  Expect.isTrue(DubGenRef.isSubtypeOf(DubGen));
+
+
+  // Type variable.
+  TypeMirror TFromA =
+      (thisLibrary.declarations[#A] as ClassMirror).typeVariables.single;
+  TypeMirror TFromB =
+      (thisLibrary.declarations[#B] as ClassMirror).typeVariables.single;
+  TypeMirror TFromC =
+      (thisLibrary.declarations[#C] as ClassMirror).typeVariables.single;
+
+  Expect.isTrue(TFromA.isSubtypeOf(TFromA));
+  Expect.isTrue(TFromB.isSubtypeOf(TFromB));
+  Expect.isTrue(TFromC.isSubtypeOf(TFromC));
+
+  Expect.isFalse(TFromA.isSubtypeOf(TFromB));
+  Expect.isFalse(TFromA.isSubtypeOf(TFromC));
+  Expect.isFalse(TFromB.isSubtypeOf(TFromA));
+  Expect.isFalse(TFromB.isSubtypeOf(TFromC));
+  Expect.isFalse(TFromC.isSubtypeOf(TFromA));
+  Expect.isFalse(TFromC.isSubtypeOf(TFromB));
+  
+  TypeMirror Num = coreLibrary.declarations[#num];
+  Expect.isTrue(TFromC.isSubtypeOf(Num));
+  Expect.isFalse(Num.isSubtypeOf(TFromC));
+
+
+  // dynamic & void.
+  TypeMirror Dynamic = mirrors.dynamicType;
+  Expect.isTrue(Dynamic.isSubtypeOf(Dynamic));
+  Expect.isTrue(Obj.isSubtypeOf(Dynamic));
+  Expect.isTrue(Super.isSubtypeOf(Dynamic));
+  Expect.isTrue(Sub1.isSubtypeOf(Dynamic));
+  Expect.isTrue(Sub2.isSubtypeOf(Dynamic));
+  Expect.isTrue(NumPred.isSubtypeOf(Dynamic));
+  Expect.isTrue(IntPred.isSubtypeOf(Dynamic));
+  Expect.isTrue(DubPred.isSubtypeOf(Dynamic));
+  Expect.isTrue(NumPredRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(IntPredRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(DubPredRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(NumGen.isSubtypeOf(Dynamic));
+  Expect.isTrue(IntGen.isSubtypeOf(Dynamic));
+  Expect.isTrue(DubGen.isSubtypeOf(Dynamic));
+  Expect.isTrue(NumGenRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(IntGenRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(DubGenRef.isSubtypeOf(Dynamic));
+  Expect.isTrue(TFromA.isSubtypeOf(Dynamic));
+  Expect.isTrue(TFromB.isSubtypeOf(Dynamic));
+  Expect.isTrue(TFromC.isSubtypeOf(Dynamic));
+  Expect.isTrue(Dynamic.isSubtypeOf(Obj));
+  Expect.isTrue(Dynamic.isSubtypeOf(Super));
+  Expect.isTrue(Dynamic.isSubtypeOf(Sub1));
+  Expect.isTrue(Dynamic.isSubtypeOf(Sub2));
+  Expect.isTrue(Dynamic.isSubtypeOf(NumPred));
+  Expect.isTrue(Dynamic.isSubtypeOf(IntPred));
+  Expect.isTrue(Dynamic.isSubtypeOf(DubPred));
+  Expect.isTrue(Dynamic.isSubtypeOf(NumPredRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(IntPredRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(DubPredRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(NumGen));
+  Expect.isTrue(Dynamic.isSubtypeOf(IntGen));
+  Expect.isTrue(Dynamic.isSubtypeOf(DubGen));
+  Expect.isTrue(Dynamic.isSubtypeOf(NumGenRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(IntGenRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(DubGenRef));
+  Expect.isTrue(Dynamic.isSubtypeOf(TFromA));
+  Expect.isTrue(Dynamic.isSubtypeOf(TFromB));
+  Expect.isTrue(Dynamic.isSubtypeOf(TFromC));
+
+  TypeMirror Void = mirrors.voidType;
+  Expect.isTrue(Void.isSubtypeOf(Void));
+  Expect.isFalse(Obj.isSubtypeOf(Void));
+  Expect.isFalse(Super.isSubtypeOf(Void));
+  Expect.isFalse(Sub1.isSubtypeOf(Void));
+  Expect.isFalse(Sub2.isSubtypeOf(Void));
+  Expect.isFalse(NumPred.isSubtypeOf(Void));
+  Expect.isFalse(IntPred.isSubtypeOf(Void));
+  Expect.isFalse(DubPred.isSubtypeOf(Void));
+  Expect.isFalse(NumPredRef.isSubtypeOf(Void));
+  Expect.isFalse(IntPredRef.isSubtypeOf(Void));
+  Expect.isFalse(DubPredRef.isSubtypeOf(Void));
+  Expect.isFalse(NumGen.isSubtypeOf(Void));
+  Expect.isFalse(IntGen.isSubtypeOf(Void));
+  Expect.isFalse(DubGen.isSubtypeOf(Void));
+  Expect.isFalse(NumGenRef.isSubtypeOf(Void));
+  Expect.isFalse(IntGenRef.isSubtypeOf(Void));
+  Expect.isFalse(DubGenRef.isSubtypeOf(Void));
+  Expect.isFalse(TFromA.isSubtypeOf(Void));
+  Expect.isFalse(TFromB.isSubtypeOf(Void));
+  Expect.isFalse(TFromC.isSubtypeOf(Void));
+  Expect.isFalse(Void.isSubtypeOf(Obj));
+  Expect.isFalse(Void.isSubtypeOf(Super));
+  Expect.isFalse(Void.isSubtypeOf(Sub1));
+  Expect.isFalse(Void.isSubtypeOf(Sub2));
+  Expect.isFalse(Void.isSubtypeOf(NumPred));
+  Expect.isFalse(Void.isSubtypeOf(IntPred));
+  Expect.isFalse(Void.isSubtypeOf(DubPred));
+  Expect.isFalse(Void.isSubtypeOf(NumPredRef));
+  Expect.isFalse(Void.isSubtypeOf(IntPredRef));
+  Expect.isFalse(Void.isSubtypeOf(DubPredRef));
+  Expect.isFalse(Void.isSubtypeOf(NumGen));
+  Expect.isFalse(Void.isSubtypeOf(IntGen));
+  Expect.isFalse(Void.isSubtypeOf(DubGen));
+  Expect.isFalse(Void.isSubtypeOf(NumGenRef));
+  Expect.isFalse(Void.isSubtypeOf(IntGenRef));
+  Expect.isFalse(Void.isSubtypeOf(DubGenRef));
+  Expect.isFalse(Void.isSubtypeOf(TFromA));
+  Expect.isFalse(Void.isSubtypeOf(TFromB));
+  Expect.isFalse(Void.isSubtypeOf(TFromC));
+
+  Expect.isTrue(Dynamic.isSubtypeOf(Void));
+  Expect.isTrue(Void.isSubtypeOf(Dynamic));
+}
+
+main() {
+  test(currentMirrorSystem());
+}