refactor DDC to support --ignore-unrecognized-flags

pkg/analyzer/lib/src/command_line/arguments.dart

 // Copyright (c) 2016, 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.src.command_line.arguments;
 
 import 'dart:collection';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:args/args.dart';
 import 'package:path/path.dart';
 
 const String analysisOptionsFileOption = 'options';
 const String defineVariableOption = 'D';
 const String enableInitializingFormalAccessFlag = 'initializing-formal-access';
 const String enableStrictCallChecksFlag = 'enable-strict-call-checks';
 const String enableSuperInMixinFlag = 'supermixin';
-const String ignoreUnrecognizedFlagsFlag = 'ignore_unrecognized_flags';
+const String ignoreUnrecognizedFlagsFlag = 'ignore-unrecognized-flags';
 const String noImplicitCastsFlag = 'no-implicit-casts';
 const String noImplicitDynamicFlag = 'no-implicit-dynamic';
 const String packageRootOption = 'package-root';
 const String packagesOption = 'packages';
 const String sdkPathOption = 'dart-sdk';
 const String sdkSummaryPathOption = 'dart-sdk-summary';
 const String strongModeFlag = 'strong';
 
 /**
  * Use the given [resourceProvider], [contentCache] and command-line [args] to
@@ skipping 167 matching lines @@
  * Return a list of command-line arguments containing all of the given [args]
  * that are defined by the given [parser]. An argument is considered to be
  * defined by the parser if
  * - it starts with '--' and the rest of the argument (minus any value
  *   introduced by '=') is the name of a known option,
  * - it starts with '-' and the rest of the argument (minus any value
  *   introduced by '=') is the name of a known abbreviation, or
  * - it starts with something other than '--' or '-'.
  *
  * This function allows command-line tools to implement the
- * '--ignore_unrecognized_flags' option.
+ * '--ignore-unrecognized-flags' option.
  */
 List<String> filterUnknownArguments(List<String> args, ArgParser parser) {
   Set<String> knownOptions = new HashSet<String>();
   Set<String> knownAbbreviations = new HashSet<String>();
   parser.options.forEach((String name, Option option) {
     knownOptions.add(name);
     String abbreviation = option.abbreviation;
     if (abbreviation != null) {
       knownAbbreviations.add(abbreviation);
     }
@@ skipping 58 matching lines @@
           .replaceAll('\r\n', '\n')
           .replaceAll('\r', '\n')
           .split('\n')
           .where((String line) => line.isNotEmpty));
     } on FileSystemException catch (e) {
       throw new Exception('Failed to read file specified by $lastArg : $e');
     }
   }
   return args;
 }