Preliminary checked mirrors (not ready for review yet)

pkg/checked_mirrors/test/logging_and_throws_test.dart

+import 'dart:mirrors' as m;
+import 'package:checked_mirrors/checked_mirrors.dart';
+import 'package:checked_mirrors/control.dart';
+
+import 'package:logging/logging.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/compact_vm_config.dart';
+
+@MirrorsUsed(symbols: 'y', targets: const [B], metaTargets: const[Reflected])
+const checked_mirrors_workaround_for_issue_10360 = 0;
+
+class Reflected { const Reflected(); }
+const reflected = const Reflected();
+
+class A {
+  int x = 1;
+  int y = 2; // declared symbol 'y', but target is not declared either
+}
+
+class B {
+  int x = 3; // covered by class B
+}
+
+@Reflected() // all symbols in this class are declared
+class C {
+  int x = 4;
+  int z = 5;
+}
+
+class D {
+  @reflected int x = 6;
+  int z = 7; // not declared
+}
+
+var a = new A();
+var b = new B();
+var c = new C();
+var d = new D();
+
+main() {
+  hierarchicalLoggingEnabled = true;
+  useCompactVMConfiguration();
+
+  var logger = new Logger('checked_mirrors');
+  logger.level = Level.ALL;
+  final records = [];
+  var firstError = null;
+  var reportedErrors = 0;
+  logger.onRecord.listen((r) {
+    reportedErrors++;
+    if (firstError == null) {
+      firstError = r;
+      return;
+    }
+    records.add(r);
+  });
+  initialize(throwOnWarning: true, log: true, hints: 'my-hint-goes-here');
+
+  tearDown(() {
+    try {
+      // Ensure that each test accounts for all reported warnings.
+      expect(records, hasLength(0));
+      if (reportedErrors > 0) {
+        expect(firstError.message, '${FIRST_ERROR_MESSAGE}my-hint-goes-here');
+      }
+    } finally {
+      records.clear();
+    }
+  });
+
+  group('get name,', () {
+    test('default mirrors', () {
+      expect(m.MirrorSystem.getName(#x), 'x');
+      expect(m.MirrorSystem.getSymbol('x'), #x);
+      expect(m.MirrorSystem.getName(#y), 'y');
+      expect(m.MirrorSystem.getSymbol('y'), #y);
+    });
+
+    test('symbol is declared', () {
+      expect(MirrorSystem.getName(#y), 'y');
+      expect(MirrorSystem.getSymbol('y'), #y);
+    });
+
+    test('symbol is not declared', () {
+      expect(() => MirrorSystem.getName(#x), throws);
+      expect(records.length, 1); // woo hoo! this was detected
+      var r = records.removeLast();
+      expect(r.message,
+          'Symbol "x" was used, but it is missing a @MirrorsUsed annotation.');
+      expect(() => MirrorSystem.getSymbol('x'), throws);
+      expect(records.length, 1);
+      r = records.removeLast();
+      expect(r.message,
+          'Symbol "x" was used, but it is missing a @MirrorsUsed annotation.');
+    });
+
+  });
+  group('get field,', () {
+    test('default mirrors', () {
+      expect(m.reflect(a).getField(#y).reflectee, 2);
+      expect(m.reflect(b).getField(#x).reflectee, 3);
+
+      expect(m.reflect(c).getField(#x).reflectee, 4);
+      expect(m.reflect(c).getField(#z).reflectee, 5);
+
+      expect(m.reflect(d).getField(#x).reflectee, 6);
+      expect(m.reflect(d).getField(#z).reflectee, 7);
+    });
+
+    test('symbol is not declared', () {
+      expect(() => reflect(a).getField(#x), throws);
+      expect(records.length, 1);
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "A.x" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+
+    test('even if symbol is declared', () {
+      expect(() => reflect(a).getField(#y), throws);
+      expect(records.length, 1);
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "A.y" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+
+    test('target is declared', () {
+      expect(reflect(b).getField(#x).reflectee, 3);
+    });
+
+    test('meta target is declared on class', () {
+      expect(reflect(c).getField(#x).reflectee, 4);
+      expect(reflect(c).getField(#z).reflectee, 5);
+    });
+
+    test('meta target is declared on field', () {
+      expect(reflect(d).getField(#x).reflectee, 6);
+      expect(() => reflect(d).getField(#z), throws);
+      expect(records, hasLength(1));
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "D.z" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+  });
+
+  group('set field,', () {
+    test('default mirrors', () {
+      m.reflect(a).setField(#x, 101);
+      m.reflect(a).setField(#y, 102);
+      m.reflect(b).setField(#x, 103);
+      m.reflect(c).setField(#x, 104);
+      m.reflect(c).setField(#z, 105);
+      m.reflect(d).setField(#x, 106);
+      m.reflect(d).setField(#z, 107);
+
+      expect(a.x, 101);
+      expect(a.y, 102);
+      expect(b.x, 103);
+      expect(c.x, 104);
+      expect(c.z, 105);
+      expect(d.x, 106);
+      expect(d.z, 107);
+    });
+
+    test('symbol not declared', () {
+      expect(() => reflect(a).setField(#x, 201), throws);
+      expect(records.length, 1);
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "A.x" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+
+    test('even if symbol is declared', () {
+      expect(() => reflect(a).setField(#y, 202), throws);
+      expect(records.length, 1);
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "A.y" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+
+    test('target is declared', () {
+      reflect(b).setField(#x, 203);
+      expect(b.x, 203);
+    });
+
+    test('meta target is declared on class', () {
+      reflect(c).setField(#x, 204);
+      reflect(c).setField(#z, 205);
+      expect(c.x, 204);
+      expect(c.z, 205);
+    });
+
+    test('meta target is declared on field', () {
+      reflect(d).setField(#x, 206);
+      expect(() => reflect(d).setField(#z, 207), throws);
+      expect(d.x, 206);
+      expect(records, hasLength(1));
+      var r = records.removeLast();
+      expect(r.message, 'Tried to access "D.z" via mirrors, '
+          'but it is missing a @MirrorsUsed annotation.');
+    });
+  });
+}