refactor DDC to support --ignore-unrecognized-flags

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/file_system/physical_file_system.dart';
 import 'package:analyzer/src/command_line/arguments.dart';
-import 'package:analyzer/src/command_line/command_line_parser.dart';
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:args/args.dart';
 import 'package:cli_util/cli_util.dart' show getSdkDir;
 
 const _binaryName = 'dartanalyzer';
 
 /// Shared exit handler.
 ///
 /// *Visible for testing.*
 ExitHandler exitHandler = exit;
@@ skipping 253 matching lines @@
     }
   }
 
   static CommandLineOptions _parse(List<String> args) {
     args = preprocessArgs(PhysicalResourceProvider.INSTANCE, args);
 
     bool verbose = args.contains('-v') || args.contains('--verbose');
     bool hide = !verbose;
 
     args = args.expand((String arg) => arg.split('=')).toList();
-    var parser = new CommandLineParser()
+    var parser = new ArgParser(allowTrailingOptions: true)
       ..addFlag('batch',
           abbr: 'b',
           help: 'Read commands from standard input (for testing).',
           defaultsTo: false,
           negatable: false)
       ..addOption('dart-sdk', help: 'The path to the Dart SDK.')
       ..addOption('dart-sdk-summary',
           help: 'The path to the Dart SDK summary file.', hide: true)
       ..addOption('packages',
           help:
@@ skipping 15 matching lines @@
           help: 'Print the analyzer version.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('lints',
           help: 'Show lint results.', defaultsTo: false, negatable: false)
       ..addFlag('no-hints',
           help: 'Do not show hint results.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('disable-cache-flushing', defaultsTo: false, hide: true)
+      ..addFlag(ignoreUnrecognizedFlagsFlag,
+          help: 'Ignore unrecognized command line flags.',
+          defaultsTo: false,
+          negatable: false)
       ..addFlag('fatal-hints',
           help: 'Treat hints as fatal.', defaultsTo: false, negatable: false)
       ..addFlag('fatal-warnings',
           help: 'Treat non-type warnings as fatal.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('fatal-lints',
           help: 'Treat lints as fatal.', defaultsTo: false, negatable: false)
       ..addFlag('package-warnings',
           help: 'Show warnings from package: imports.',
@@ skipping 151 matching lines @@
       ..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>{};
       args = extractDefinedVariables(args, definedVariables);
+      if (args.contains('--$ignoreUnrecognizedFlagsFlag')) {
+        args = filterUnknownArguments(args, parser);
+      }
       var results = parser.parse(args);
 
       // Persistent worker.
       if (args.contains('--persistent_worker')) {
         bool validArgs;
         if (!args.contains('--build-mode')) {
           validArgs = false;
         } else if (args.length == 2) {
           validArgs = true;
         } else if (args.length == 4 && args.contains('--dart-sdk')) {
@@ skipping 54 matching lines @@
 
   static _showUsage(parser) {
     errorSink
         .writeln('Usage: $_binaryName [options...] <libraries to analyze...>');
     errorSink.writeln(parser.getUsage());
     errorSink.writeln('');
     errorSink.writeln(
         'For more information, see http://www.dartlang.org/tools/analyzer.');
   }
 }