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

tests/lib/mirrors/relation_assignable_test.dart

+// 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_assignable;
+
+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_assignable);
+
+  // Classes.
+  TypeMirror Super = thisLibrary.declarations[#Superclass];
+  TypeMirror Sub1 = thisLibrary.declarations[#Subclass1];
+  TypeMirror Sub2 = thisLibrary.declarations[#Subclass2];
+  TypeMirror Obj = coreLibrary.declarations[#Object];
+
+  Expect.isTrue(Obj.isAssignableTo(Obj));
+  Expect.isTrue(Super.isAssignableTo(Super));
+  Expect.isTrue(Sub1.isAssignableTo(Sub1));
+  Expect.isTrue(Sub2.isAssignableTo(Sub2));
+
+  Expect.isTrue(Sub1.isAssignableTo(Super));
+  Expect.isTrue(Super.isAssignableTo(Sub1));
+
+  Expect.isTrue(Sub2.isAssignableTo(Super));
+  Expect.isTrue(Super.isAssignableTo(Sub2));
+
+  Expect.isFalse(Sub2.isAssignableTo(Sub1));
+  Expect.isFalse(Sub1.isAssignableTo(Sub2));
+
+  Expect.isTrue(Sub1.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Sub1));
+
+  Expect.isTrue(Sub2.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Sub2));
+
+  Expect.isTrue(Super.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(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.isAssignableTo(Func));
+  Expect.isTrue(NumPred.isAssignableTo(NumPred));
+  Expect.isTrue(IntPred.isAssignableTo(IntPred));
+  Expect.isTrue(DubPred.isAssignableTo(DubPred));
+
+  Expect.isTrue(NumPred.isAssignableTo(Func));
+  Expect.isTrue(NumPred.isAssignableTo(IntPred));
+  Expect.isTrue(NumPred.isAssignableTo(DubPred));
+
+  Expect.isTrue(IntPred.isAssignableTo(Func));
+  Expect.isTrue(IntPred.isAssignableTo(NumPred));
+  Expect.isFalse(IntPred.isAssignableTo(DubPred));
+
+  Expect.isTrue(DubPred.isAssignableTo(Func));
+  Expect.isTrue(DubPred.isAssignableTo(NumPred));
+  Expect.isFalse(DubPred.isAssignableTo(IntPred));
+
+  Expect.isTrue(Func.isAssignableTo(Obj));
+  Expect.isTrue(NumPred.isAssignableTo(Obj));
+  Expect.isTrue(IntPred.isAssignableTo(Obj));
+  Expect.isTrue(DubPred.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Func));
+  Expect.isTrue(Obj.isAssignableTo(NumPred));
+  Expect.isTrue(Obj.isAssignableTo(IntPred));
+  Expect.isTrue(Obj.isAssignableTo(DubPred));
+
+
+  // Function typedef - return type.
+  TypedefMirror NumGen = thisLibrary.declarations[#NumberGenerator];
+  TypedefMirror IntGen = thisLibrary.declarations[#IntegerGenerator];
+  TypedefMirror DubGen = thisLibrary.declarations[#DoubleGenerator];
+
+  Expect.isTrue(NumGen.isAssignableTo(NumGen));
+  Expect.isTrue(IntGen.isAssignableTo(IntGen));
+  Expect.isTrue(DubGen.isAssignableTo(DubGen));
+
+  Expect.isTrue(NumGen.isAssignableTo(Func));
+  Expect.isTrue(NumGen.isAssignableTo(IntGen));
+  Expect.isTrue(NumGen.isAssignableTo(DubGen));
+
+  Expect.isTrue(IntGen.isAssignableTo(Func));
+  Expect.isTrue(IntGen.isAssignableTo(NumGen));
+  Expect.isFalse(IntGen.isAssignableTo(DubGen));
+
+  Expect.isTrue(DubGen.isAssignableTo(Func));
+  Expect.isTrue(DubGen.isAssignableTo(NumGen));
+  Expect.isFalse(DubGen.isAssignableTo(IntGen));
+
+  Expect.isTrue(Func.isAssignableTo(Obj));
+  Expect.isTrue(NumGen.isAssignableTo(Obj));
+  Expect.isTrue(IntGen.isAssignableTo(Obj));
+  Expect.isTrue(DubGen.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Func));
+  Expect.isTrue(Obj.isAssignableTo(NumGen));
+  Expect.isTrue(Obj.isAssignableTo(IntGen));
+  Expect.isTrue(Obj.isAssignableTo(DubGen));
+
+  
+  // Function - argument type.
+  TypeMirror NumPredRef = NumPred.referent;
+  TypeMirror IntPredRef = IntPred.referent;
+  TypeMirror DubPredRef = DubPred.referent;
+
+  Expect.isTrue(Func.isAssignableTo(Func));
+  Expect.isTrue(NumPredRef.isAssignableTo(NumPredRef));
+  Expect.isTrue(IntPredRef.isAssignableTo(IntPredRef));
+  Expect.isTrue(DubPredRef.isAssignableTo(DubPredRef));
+
+  Expect.isTrue(NumPredRef.isAssignableTo(Func));
+  Expect.isTrue(NumPredRef.isAssignableTo(IntPredRef));
+  Expect.isTrue(NumPredRef.isAssignableTo(DubPredRef));
+
+  Expect.isTrue(IntPredRef.isAssignableTo(Func));
+  Expect.isTrue(IntPredRef.isAssignableTo(NumPredRef));
+  Expect.isFalse(IntPredRef.isAssignableTo(DubPredRef));
+
+  Expect.isTrue(DubPredRef.isAssignableTo(Func));
+  Expect.isTrue(DubPredRef.isAssignableTo(NumPredRef));
+  Expect.isFalse(DubPredRef.isAssignableTo(IntPredRef));
+
+  Expect.isTrue(Func.isAssignableTo(Obj));
+  Expect.isTrue(NumPredRef.isAssignableTo(Obj));
+  Expect.isTrue(IntPredRef.isAssignableTo(Obj));
+  Expect.isTrue(DubPredRef.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Func));
+  Expect.isTrue(Obj.isAssignableTo(NumPredRef));
+  Expect.isTrue(Obj.isAssignableTo(IntPredRef));
+  Expect.isTrue(Obj.isAssignableTo(DubPredRef));
+
+
+  // Function - return type.
+  TypeMirror NumGenRef = NumGen.referent;
+  TypeMirror IntGenRef = IntGen.referent;
+  TypeMirror DubGenRef = DubGen.referent;
+
+  Expect.isTrue(NumGenRef.isAssignableTo(NumGenRef));
+  Expect.isTrue(IntGenRef.isAssignableTo(IntGenRef));
+  Expect.isTrue(DubGenRef.isAssignableTo(DubGenRef));
+
+  Expect.isTrue(NumGenRef.isAssignableTo(Func));
+  Expect.isTrue(NumGenRef.isAssignableTo(IntGenRef));
+  Expect.isTrue(NumGenRef.isAssignableTo(DubGenRef));
+
+  Expect.isTrue(IntGenRef.isAssignableTo(Func));
+  Expect.isTrue(IntGenRef.isAssignableTo(NumGenRef));
+  Expect.isFalse(IntGenRef.isAssignableTo(DubGenRef));
+
+  Expect.isTrue(DubGenRef.isAssignableTo(Func));
+  Expect.isTrue(DubGenRef.isAssignableTo(NumGenRef));
+  Expect.isFalse(DubGenRef.isAssignableTo(IntGenRef));
+
+  Expect.isTrue(Func.isAssignableTo(Obj));
+  Expect.isTrue(NumGenRef.isAssignableTo(Obj));
+  Expect.isTrue(IntGenRef.isAssignableTo(Obj));
+  Expect.isTrue(DubGenRef.isAssignableTo(Obj));
+  Expect.isTrue(Obj.isAssignableTo(Func));
+  Expect.isTrue(Obj.isAssignableTo(NumGenRef));
+  Expect.isTrue(Obj.isAssignableTo(IntGenRef));
+  Expect.isTrue(Obj.isAssignableTo(DubGenRef));
+
+
+  // Function typedef / function.
+  Expect.isTrue(NumPred.isAssignableTo(NumPredRef));
+  Expect.isTrue(IntPred.isAssignableTo(IntPredRef));
+  Expect.isTrue(DubPred.isAssignableTo(DubPredRef));
+  Expect.isTrue(NumPredRef.isAssignableTo(NumPred));
+  Expect.isTrue(IntPredRef.isAssignableTo(IntPred));
+  Expect.isTrue(DubPredRef.isAssignableTo(DubPred));
+
+
+  // Function typedef / function.
+  Expect.isTrue(NumGen.isAssignableTo(NumGenRef));
+  Expect.isTrue(IntGen.isAssignableTo(IntGenRef));
+  Expect.isTrue(DubGen.isAssignableTo(DubGenRef));
+  Expect.isTrue(NumGenRef.isAssignableTo(NumGen));
+  Expect.isTrue(IntGenRef.isAssignableTo(IntGen));
+  Expect.isTrue(DubGenRef.isAssignableTo(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.isAssignableTo(TFromA));
+  Expect.isTrue(TFromB.isAssignableTo(TFromB));
+  Expect.isTrue(TFromC.isAssignableTo(TFromC));
+
+  Expect.isFalse(TFromA.isAssignableTo(TFromB));
+  Expect.isFalse(TFromA.isAssignableTo(TFromC));
+  Expect.isFalse(TFromB.isAssignableTo(TFromA));
+  Expect.isFalse(TFromB.isAssignableTo(TFromC));
+  Expect.isFalse(TFromC.isAssignableTo(TFromA));
+  Expect.isFalse(TFromC.isAssignableTo(TFromB));
+  
+  TypeMirror Num = coreLibrary.declarations[#num];
+  Expect.isTrue(TFromC.isAssignableTo(Num));
+  Expect.isTrue(Num.isAssignableTo(TFromC));
+
+
+  // dynamic & void.
+  TypeMirror Dynamic = mirrors.dynamicType;
+  Expect.isTrue(Dynamic.isAssignableTo(Dynamic));
+  Expect.isTrue(Obj.isAssignableTo(Dynamic));
+  Expect.isTrue(Super.isAssignableTo(Dynamic));
+  Expect.isTrue(Sub1.isAssignableTo(Dynamic));
+  Expect.isTrue(Sub2.isAssignableTo(Dynamic));
+  Expect.isTrue(NumPred.isAssignableTo(Dynamic));
+  Expect.isTrue(IntPred.isAssignableTo(Dynamic));
+  Expect.isTrue(DubPred.isAssignableTo(Dynamic));
+  Expect.isTrue(NumPredRef.isAssignableTo(Dynamic));
+  Expect.isTrue(IntPredRef.isAssignableTo(Dynamic));
+  Expect.isTrue(DubPredRef.isAssignableTo(Dynamic));
+  Expect.isTrue(NumGen.isAssignableTo(Dynamic));
+  Expect.isTrue(IntGen.isAssignableTo(Dynamic));
+  Expect.isTrue(DubGen.isAssignableTo(Dynamic));
+  Expect.isTrue(NumGenRef.isAssignableTo(Dynamic));
+  Expect.isTrue(IntGenRef.isAssignableTo(Dynamic));
+  Expect.isTrue(DubGenRef.isAssignableTo(Dynamic));
+  Expect.isTrue(TFromA.isAssignableTo(Dynamic));
+  Expect.isTrue(TFromB.isAssignableTo(Dynamic));
+  Expect.isTrue(TFromC.isAssignableTo(Dynamic));
+  Expect.isTrue(Dynamic.isAssignableTo(Obj));
+  Expect.isTrue(Dynamic.isAssignableTo(Super));
+  Expect.isTrue(Dynamic.isAssignableTo(Sub1));
+  Expect.isTrue(Dynamic.isAssignableTo(Sub2));
+  Expect.isTrue(Dynamic.isAssignableTo(NumPred));
+  Expect.isTrue(Dynamic.isAssignableTo(IntPred));
+  Expect.isTrue(Dynamic.isAssignableTo(DubPred));
+  Expect.isTrue(Dynamic.isAssignableTo(NumPredRef));
+  Expect.isTrue(Dynamic.isAssignableTo(IntPredRef));
+  Expect.isTrue(Dynamic.isAssignableTo(DubPredRef));
+  Expect.isTrue(Dynamic.isAssignableTo(NumGen));
+  Expect.isTrue(Dynamic.isAssignableTo(IntGen));
+  Expect.isTrue(Dynamic.isAssignableTo(DubGen));
+  Expect.isTrue(Dynamic.isAssignableTo(NumGenRef));
+  Expect.isTrue(Dynamic.isAssignableTo(IntGenRef));
+  Expect.isTrue(Dynamic.isAssignableTo(DubGenRef));
+  Expect.isTrue(Dynamic.isAssignableTo(TFromA));
+  Expect.isTrue(Dynamic.isAssignableTo(TFromB));
+  Expect.isTrue(Dynamic.isAssignableTo(TFromC));
+
+  TypeMirror Void = mirrors.voidType;
+  Expect.isTrue(Void.isAssignableTo(Void));
+  Expect.isFalse(Obj.isAssignableTo(Void));
+  Expect.isFalse(Super.isAssignableTo(Void));
+  Expect.isFalse(Sub1.isAssignableTo(Void));
+  Expect.isFalse(Sub2.isAssignableTo(Void));
+  Expect.isFalse(NumPred.isAssignableTo(Void));
+  Expect.isFalse(IntPred.isAssignableTo(Void));
+  Expect.isFalse(DubPred.isAssignableTo(Void));
+  Expect.isFalse(NumPredRef.isAssignableTo(Void));
+  Expect.isFalse(IntPredRef.isAssignableTo(Void));
+  Expect.isFalse(DubPredRef.isAssignableTo(Void));
+  Expect.isFalse(NumGen.isAssignableTo(Void));
+  Expect.isFalse(IntGen.isAssignableTo(Void));
+  Expect.isFalse(DubGen.isAssignableTo(Void));
+  Expect.isFalse(NumGenRef.isAssignableTo(Void));
+  Expect.isFalse(IntGenRef.isAssignableTo(Void));
+  Expect.isFalse(DubGenRef.isAssignableTo(Void));
+  Expect.isFalse(TFromA.isAssignableTo(Void));
+  Expect.isFalse(TFromB.isAssignableTo(Void));
+  Expect.isFalse(TFromC.isAssignableTo(Void));
+  Expect.isFalse(Void.isAssignableTo(Obj));
+  Expect.isFalse(Void.isAssignableTo(Super));
+  Expect.isFalse(Void.isAssignableTo(Sub1));
+  Expect.isFalse(Void.isAssignableTo(Sub2));
+  Expect.isFalse(Void.isAssignableTo(NumPred));
+  Expect.isFalse(Void.isAssignableTo(IntPred));
+  Expect.isFalse(Void.isAssignableTo(DubPred));
+  Expect.isFalse(Void.isAssignableTo(NumPredRef));
+  Expect.isFalse(Void.isAssignableTo(IntPredRef));
+  Expect.isFalse(Void.isAssignableTo(DubPredRef));
+  Expect.isFalse(Void.isAssignableTo(NumGen));
+  Expect.isFalse(Void.isAssignableTo(IntGen));
+  Expect.isFalse(Void.isAssignableTo(DubGen));
+  Expect.isFalse(Void.isAssignableTo(NumGenRef));
+  Expect.isFalse(Void.isAssignableTo(IntGenRef));
+  Expect.isFalse(Void.isAssignableTo(DubGenRef));
+  Expect.isFalse(Void.isAssignableTo(TFromA));
+  Expect.isFalse(Void.isAssignableTo(TFromB));
+  Expect.isFalse(Void.isAssignableTo(TFromC));
+
+  Expect.isTrue(Dynamic.isAssignableTo(Void));
+  Expect.isTrue(Void.isAssignableTo(Dynamic));
+}
+
+main() {
+  test(currentMirrorSystem());
+}