Creates `reflectors`, as a meta-meta feature that enables dynamic selection of a "mirror system".

test_reflectable/test/meta_reflectors_user.dart

+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// File being transformed by the reflectable transformer.
+// Part of the entry point 'reflectors_test.dart'.
+//
+// Independence: This library depends on the domain classes `M1`..`M3`,
+// `A`..`D`, `P`, and it dynamically uses the reflectors, but it does not
+// statically depend on 'meta_reflectors_definer.dart' nor on
+// 'meta_reflectors_domain_definer.dart'.
+
+library test_reflectable.test.meta_reflectors_user;
+
+import "package:reflectable/reflectable.dart";
+import "package:unittest/unittest.dart";
+import "meta_reflectors_meta.dart";
+import "meta_reflectors_domain.dart";
+
+testReflector(Reflectable reflector, String desc) {
+  test("Mixin, $desc", () {
+    ClassMirror aMirror = reflector.reflectType(A);
+    ClassMirror bMirror = reflector.reflectType(B);
+    ClassMirror cMirror = reflector.reflectType(C);
+    ClassMirror dMirror = reflector.reflectType(D);
+    ClassMirror m1Mirror = reflector.reflectType(M1);
+    ClassMirror m2Mirror = reflector.reflectType(M2);
+    ClassMirror m3Mirror = reflector.reflectType(M3);
+    expect(aMirror.mixin, aMirror);
+    expect(bMirror.mixin, bMirror);
+    expect(cMirror.mixin, cMirror);
+    expect(m1Mirror.mixin, m1Mirror);
+    expect(m2Mirror.mixin, m2Mirror);
+    expect(m3Mirror.mixin, m3Mirror);
+    expect(bMirror.superclass.mixin, m1Mirror);
+    expect(cMirror.superclass.superclass.mixin, m2Mirror);
+    expect(cMirror.superclass.mixin, m3Mirror);
+    expect(cMirror.superclass.superclass.superclass, bMirror);
+    expect(dMirror.mixin, m1Mirror);
+    expect(dMirror.superclass.mixin, aMirror);
+    expect(bMirror.superclass.declarations["foo"].owner, m1Mirror);
+    expect(bMirror.superclass.declarations["field"].owner, m1Mirror);
+    expect(bMirror.superclass.declarations["staticBar"], null);
+    expect(bMirror.superclass.hasReflectedType, true);
+    expect(bMirror.superclass.reflectedType, const isInstanceOf<Type>());
+    expect(bMirror.superclass.superclass.reflectedType,
+        const isInstanceOf<Type>());
+  });
+}
+
+Matcher throwsANoSuchCapabilityException =
+    throwsA(const isInstanceOf<NoSuchCapabilityError>());
+
+Iterable<String> getNames(Iterable<Reflectable> reflectables) {
+  return reflectables.map((Reflectable reflector) {
+    String fullString = reflector.toString();
+    return fullString.substring(13, fullString.length - 1);
+  });
+}
+
+runTests() {
+  List<Reflectable> reflectors =
+      const AllReflectorsMetaReflector().reflectors.toList();
+
+  test("MetaReflector, set of reflectors", () {
+    expect(
+        getNames(reflectors).toSet(),
+        [
+          "Reflector",
+          "Reflector2",
+          "ReflectorUpwardsClosed",
+          "ReflectorUpwardsClosedToA",
+          "ReflectorUpwardsClosedUntilA",
+          "ScopeMetaReflector",
+          "AllReflectorsMetaReflector"
+        ].toSet());
+    expect(getNames(const ScopeMetaReflector().reflectablesOfScope("polymer")),
+        ["Reflector", "ReflectorUpwardsClosed"].toSet());
+    expect(getNames(const ScopeMetaReflector().reflectablesOfScope("observe")),
+        ["Reflector2", "ReflectorUpwardsClosed"].toSet());
+  });
+
+  const ScopeMetaReflector().reflectablesOfScope("polymer").forEach(
+      (Reflectable reflector) => testReflector(reflector, "$reflector"));
+
+  test("MetaReflector, select by name", () {
+    var reflector2 = reflectors
+        .firstWhere((Reflectable reflector) => "$reflector".contains("2"));
+    ClassMirror bMirror = reflector2.reflectType(B);
+    ClassMirror cMirror = reflector2.reflectType(C);
+    ClassMirror dMirror = reflector2.reflectType(D);
+    ClassMirror m1Mirror = reflector2.reflectType(M1);
+    ClassMirror m2Mirror = reflector2.reflectType(M2);
+    ClassMirror m3Mirror = reflector2.reflectType(M3);
+    expect(bMirror.mixin, bMirror);
+    expect(cMirror.mixin, cMirror);
+    expect(dMirror.mixin, m1Mirror);
+    expect(m1Mirror.mixin, m1Mirror);
+    // Test that metadata is preserved.
+    expect(m1Mirror.metadata, contains(const P()));
+    expect(m2Mirror.mixin, m2Mirror);
+    expect(m3Mirror.mixin, m3Mirror);
+    expect(bMirror.superclass.mixin, m1Mirror);
+    // Test that the mixin-application does not inherit the metadata from its
+    // mixin.
+    expect(bMirror.superclass.metadata, isEmpty);
+    expect(
+        () => bMirror.superclass.superclass, throwsANoSuchCapabilityException);
+    expect(cMirror.superclass.superclass.mixin, m2Mirror);
+    expect(cMirror.superclass.mixin, m3Mirror);
+    expect(cMirror.superclass.superclass.superclass, bMirror);
+    expect(() => dMirror.superclass, throwsANoSuchCapabilityException);
+  });
+
+  test("MetaReflector, select by capability", () {
+    var reflector = reflectors.firstWhere((Reflectable reflector) {
+      return (reflector.capabilities.any((ReflectCapability capability) =>
+          capability is SuperclassQuantifyCapability &&
+              capability.upperBound == A &&
+              !capability.excludeUpperBound));
+    });
+    ClassMirror aMirror = reflector.reflectType(A);
+    ClassMirror bMirror = reflector.reflectType(B);
+    ClassMirror cMirror = reflector.reflectType(C);
+    ClassMirror dMirror = reflector.reflectType(D);
+    expect(() => reflector.reflectType(M1), throwsANoSuchCapabilityException);
+    expect(() => reflector.reflectType(M2), throwsANoSuchCapabilityException);
+    expect(() => reflector.reflectType(M3), throwsANoSuchCapabilityException);
+    expect(() => bMirror.superclass.mixin, throwsANoSuchCapabilityException);
+    expect(bMirror.superclass.superclass, aMirror);
+    expect(() => cMirror.superclass.mixin, throwsANoSuchCapabilityException);
+    expect(() => cMirror.superclass.superclass.mixin,
+        throwsANoSuchCapabilityException);
+    expect(cMirror.superclass.superclass.superclass, bMirror);
+    expect(() => dMirror.mixin, throwsANoSuchCapabilityException);
+    expect(dMirror.superclass, aMirror);
+  });
+}