Warn on private members.

tests/compiler/dart2js/private_test.dart

+// Copyright (c) 2012, 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.
+
+import "package:expect/expect.dart";
+import 'mock_compiler.dart';
+
+import '../../../sdk/lib/_internal/compiler/implementation/source_file.dart';
+import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart'
+    hide SourceString;
+
+const String PRIVATE_SOURCE_URI = 'src:private';
+const String PRIVATE_SOURCE = '''
+
+var _privateVariable;
+void _privateFunction() {}
+
+class _PrivateClass {
+  _PrivateClass();
+  _PrivateClass.publicConstructor();
+  _PrivateClass._privateConstructor();
+
+  var _privateField;
+  get _privateGetter => null;
+  void set _privateSetter(var value) {}
+  void _privateMethod() {}
+
+  var publicField;
+  get publicGetter => null;
+  void set publicSetter(var value) {}
+  void publicMethod() {}
+}
+
+class PublicClass extends _PrivateClass {
+  PublicClass() : super();
+  PublicClass.publicConstructor() : super.publicConstructor();
+  PublicClass._privateConstructor() : super._privateConstructor();
+
+  _PrivateClass get private => this;
+}
+''';
+
+
+void analyze(String text, [expectedWarnings]) {
+  if (expectedWarnings == null) expectedWarnings = [];
+  if (expectedWarnings is !List) expectedWarnings = [expectedWarnings];
+
+  MockCompiler compiler = new MockCompiler(analyzeOnly: true);
+  compiler.registerSource(Uri.parse(PRIVATE_SOURCE_URI), PRIVATE_SOURCE);
+  compiler.diagnosticHandler = (uri, int begin, int end, String message, kind) {
+    SourceFile sourceFile = compiler.sourceFiles[uri.toString()];
+    if (sourceFile != null) {
+      print(sourceFile.getLocationMessage(message, begin, end, true, (x) => x));
+    } else {
+      print(message);
+    }
+  };
+
+  String source = '''
+                  library public;
+
+                  import '$PRIVATE_SOURCE_URI';
+
+                  void main() {
+                    PublicClass publicClass;
+                    $text
+                  }
+                  ''';
+  Uri uri = Uri.parse('src:public');
+  compiler.registerSource(uri, source);
+  compiler.runCompiler(uri);
+  compareWarningKinds(text, expectedWarnings, compiler.warnings);
+}
+
+void main() {
+  // Read from private variable.
+  analyze('var value = _privateVariable;', MessageKind.CANNOT_RESOLVE);
+  // Write to private variable.
+  analyze('_privateVariable = 0;', MessageKind.CANNOT_RESOLVE);
+  // Access private function.
+  analyze('var value = _privateFunction;', MessageKind.CANNOT_RESOLVE);
+  // Call private function.
+  analyze('_privateFunction();', MessageKind.CANNOT_RESOLVE);
+
+  // Call unnamed (public) constructor on private class.
+  analyze('new _PrivateClass();', MessageKind.CANNOT_RESOLVE);
+  // Call public constructor on private class.
+  analyze('new _PrivateClass.publicConstructor();', MessageKind.CANNOT_RESOLVE);
+  // Call private constructor on private class.
+  analyze('new _PrivateClass._privateConstructor();',
+      MessageKind.CANNOT_RESOLVE);
+  // Call public getter of private type.
+  analyze('var value = publicClass.private;');
+  // Read from private field on private class.
+  analyze('var value = publicClass.private._privateField;',
+      MessageKind.PRIVATE_ACCESS);
+  // Write to private field on private class.
+  analyze('publicClass.private._privateField = 0;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private getter on private class.
+  analyze('var value = publicClass.private._privateGetter;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private setter on private class.
+  analyze('publicClass.private._privateSetter = 0;',
+      MessageKind.PRIVATE_ACCESS);
+  // Access private method on private class.
+  analyze('var value = publicClass.private._privateMethod;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private method on private class.
+  analyze('publicClass.private._privateMethod();',
+      MessageKind.PRIVATE_ACCESS);
+
+  // Read from public field on private class.
+  analyze('var value = publicClass.private.publicField;');
+  // Write to public field on private class.
+  analyze('publicClass.private.publicField = 0;');
+  // Call public getter on private class.
+  analyze('var value = publicClass.private.publicGetter;');
+  // Call public setter on private class.
+  analyze('publicClass.private.publicSetter = 0;');
+  // Access public method on private class.
+  analyze('var value = publicClass.private.publicMethod;');
+  // Call public method on private class.
+  analyze('publicClass.private.publicMethod();');
+
+  // Call unnamed (public) constructor on public class.
+  analyze('publicClass = new PublicClass();');
+  // Call public constructor on public class.
+  analyze('publicClass = new PublicClass.publicConstructor();');
+  // Call private constructor on public class.
+  analyze('publicClass = new PublicClass._privateConstructor();',
+      MessageKind.CANNOT_FIND_CONSTRUCTOR);
+  // Read from private field on public class.
+  analyze('var value = publicClass._privateField;',
+      MessageKind.PRIVATE_ACCESS);
+  // Write to private field on public class.
+  analyze('publicClass._privateField = 0;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private getter on public class.
+  analyze('var value = publicClass._privateGetter;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private setter on public class.
+  analyze('publicClass._privateSetter = 0;',
+      MessageKind.PRIVATE_ACCESS);
+  // Access private method on public class.
+  analyze('var value = publicClass._privateMethod;',
+      MessageKind.PRIVATE_ACCESS);
+  // Call private method on public class.
+  analyze('publicClass._privateMethod();',
+      MessageKind.PRIVATE_ACCESS);
+
+  // Read from public field on public class.
+  analyze('var value = publicClass.publicField;');
+  // Write to public field on public class.
+  analyze('publicClass.publicField = 0;');
+  // Call public getter on public class.
+  analyze('var value = publicClass.publicGetter;');
+  // Call public setter on public class.
+  analyze('publicClass.publicSetter = 0;');
+  // Access public method on public class.
+  analyze('var value = publicClass.publicMethod;');
+  // Call public method on public class.
+  analyze('publicClass.publicMethod();');
+}
+