Add --hide-package-warnings option.

tests/compiler/dart2js/hide_package_warnings_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.
+
+// Test that the '--hide-package-warnings' option works as intended.
+
+import 'package:async_helper/async_helper.dart';
+import 'package:expect/expect.dart';
+
+import 'memory_compiler.dart';
+
+/// Error code that creates 1 warning, 1 hint, and 1 info.
+const ERROR_CODE = """
+m(Object o) {
+  if (o is String) {
+    o = o.length;
+  }
+}""";
+
+const SOURCE = const {
+  'main.dart': """
+import 'package:pkg_error1/pkg_error1.dart';
+import 'package:pkg_error2/pkg_error2.dart';
+import 'package:pkg_noerror/pkg_noerror.dart';
+import 'error.dart';               
+""",
+
+  'error.dart': ERROR_CODE,
+
+  'pkg/pkg_error1/pkg_error1.dart': """
+import 'package:pkg_error2/pkg_error2.dart';
+import 'package:pkg_noerror/pkg_noerror.dart';
+$ERROR_CODE""",
+
+  'pkg/pkg_error2/pkg_error2.dart': """
+import 'package:pkg_error1/pkg_error1.dart';
+import 'package:pkg_noerror/pkg_noerror.dart';
+$ERROR_CODE""",
+
+  'pkg/pkg_noerror/pkg_noerror.dart': """
+import 'package:pkg_error1/pkg_error1.dart';
+import 'package:pkg_error2/pkg_error2.dart';
+"""};
+
+void test(List<Uri> entryPoints,
+          {bool hidePackageWarnings: false,
+           int warnings: 0,
+           int hints: 0,
+           int infos: 0}) {
+  var options = ['--analyze-only', '--analyze-all'];
+  if (hidePackageWarnings) {
+    options.add('--hide-package-warnings');
+  }
+  var collector = new DiagnosticCollector();
+  var compiler = compilerFor(SOURCE,
+                             options: options,
+                             packageRoot: Uri.parse('memory:pkg/'),
+                             diagnosticHandler: collector);
+  Uri mainUri = null;
+  if (entryPoints.length == 1) {
+    mainUri = entryPoints[0];
+  } else {
+    compiler.librariesToAnalyzeWhenRun = entryPoints;
+  }
+  asyncTest(() => compiler.run(mainUri).then((_) {
+    print('==================================================================');
+    print('test: $entryPoints hidePackageWarnings=$hidePackageWarnings');
+    Expect.equals(0, collector.errors.length,
+                  'Unexpected errors: ${collector.errors}');
+    Expect.equals(warnings, collector.warnings.length,
+                  'Unexpected warnings: ${collector.warnings}');
+    Expect.equals(hints, collector.hints.length,
+                  'Unexpected hints: ${collector.hints}');
+    Expect.equals(infos, collector.infos.length,
+                  'Unexpected infos: ${collector.infos}');
+    print('==================================================================');
+  }));
+}
+
+void main() {
+  test([Uri.parse('memory:main.dart')],
+       hidePackageWarnings: false,
+       // From error.dart, package:pkg_error1 and package:pkg_error2:
+       warnings: 3, hints: 3, infos: 3);
+  test([Uri.parse('memory:main.dart')],
+       hidePackageWarnings: true,
+       // From error.dart only:
+       warnings: 1, hints: 1, infos: 1);
+  test([Uri.parse('package:pkg_error1/pkg_error1.dart')],
+       hidePackageWarnings: false,
+       // From package:pkg_error1 and package:pkg_error2:
+       warnings: 2, hints: 2, infos: 2);
+  test([Uri.parse('package:pkg_error1/pkg_error1.dart')],
+       hidePackageWarnings: true,
+       // From package:pkg_error1/pkg_error1.dart only:
+       warnings: 1, hints: 1, infos: 1);
+  test([Uri.parse('package:pkg_noerror/pkg_noerror.dart')],
+       hidePackageWarnings: false,
+       // From package:pkg_error1 and package:pkg_error2:
+       warnings: 2, hints: 2, infos: 2);
+  test([Uri.parse('package:pkg_noerror/pkg_noerror.dart')],
+       hidePackageWarnings: true);
+}
+