fix #26782, add no-implicit-casts, no-implicit-dynamic options

pkg/analyzer_cli/lib/src/options.dart

 // Copyright (c) 2015, 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 analyzer_cli.src.options;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:args/args.dart';
@@ skipping 132 matching lines @@
 
   /// The source files to analyze
   final List<String> sourceFiles;
 
   /// Whether to treat warnings as fatal
   final bool warningsAreFatal;
 
   /// Whether to use strong static checking.
   final bool strongMode;
 
+  /// Whether implicit casts are enabled (in strong mode)
+  final bool implicitCasts;
+
+  /// Whether implicit dynamic is enabled (mainly for strong mode users)
+  final bool implicitDynamic;
+
   /// Whether to treat lints as fatal
   final bool lintsAreFatal;
 
   /// Initialize options from the given parsed [args].
   CommandLineOptions._fromArgs(
       ArgResults args, Map<String, String> definedVariables)
       : buildAnalysisOutput = args['build-analysis-output'],
         buildMode = args['build-mode'],
         buildModePersistentWorker = args['persistent_worker'],
         buildSummaryFallback = args['build-summary-fallback'],
@@ skipping 27 matching lines @@
         perfReport = args['x-perf-report'],
         shouldBatch = args['batch'],
         showPackageWarnings = args['show-package-warnings'] ||
             args['package-warnings'] ||
             args['x-package-warnings-prefix'] != null,
         showPackageWarningsPrefix = args['x-package-warnings-prefix'],
         showSdkWarnings = args['show-sdk-warnings'] || args['warnings'],
         sourceFiles = args.rest,
         warningsAreFatal = args['fatal-warnings'],
         strongMode = args['strong'],
+        implicitCasts = !args['no-implicit-casts'],
+        implicitDynamic = !args['no-implicit-dynamic'],
         lintsAreFatal = args['fatal-lints'];
 
   /// Parse [args] into [CommandLineOptions] describing the specified
   /// analyzer options. In case of a format error, calls [printAndFail], which
   /// by default prints an error message to stderr and exits.
   static CommandLineOptions parse(List<String> args,
       [printAndFail(String msg) = printAndFail]) {
     CommandLineOptions options = _parse(args);
     // Check SDK.
     if (!options.buildModePersistentWorker) {
@@ skipping 261 matching lines @@
           help: 'Log additional messages and exceptions.',
           defaultsTo: false,
           negatable: false,
           hide: true)
       ..addFlag('enable_type_checks',
           help: 'Check types in constant evaluation.',
           defaultsTo: false,
           negatable: false,
           hide: true)
       ..addFlag('strong',
-          help: 'Enable strong static checks (https://goo.gl/DqcBsw)');
+          help: 'Enable strong static checks (https://goo.gl/DqcBsw)')
+      ..addFlag('no-implicit-casts',
+          negatable: false,
+          help: 'Disable implicit casts in strong mode (https://goo.gl/cTLz40)')
+      ..addFlag('no-implicit-dynamic',
+          negatable: false,
+          help: 'Disable implicit dynamic (https://goo.gl/m0UgXD)');
 
     try {
       // TODO(scheglov) https://code.google.com/p/dart/issues/detail?id=11061
       args =
           args.map((String arg) => arg == '-batch' ? '--batch' : arg).toList();
       Map<String, String> definedVariables = <String, String>{};
       var results = parser.parse(args, definedVariables);
 
       // Persistent worker.
       if (args.contains('--persistent_worker')) {
@@ skipping 202 matching lines @@
 
   int _getNextFlagIndex(args, i) {
     for (; i < args.length; ++i) {
       if (args[i].startsWith('--')) {
         return i;
       }
     }
     return i;
   }
 }