Change core lib, dart2js, and more for new optional parameters syntax

pkg/args/lib/args.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.
 
 /**
  * This library lets you define parsers for parsing raw command-line arguments
  * into a set of options and values using [GNU][] and [POSIX][] style options.
  *
  * ## Defining options ##
  *
@@ skipping 212 matching lines @@
   ArgParser()
     : _options = <String, _Option>{},
       _optionNames = <String>[];
 
   /**
    * Defines a flag. Throws an [ArgumentError] if:
    *
    * * There is already an option named [name].
    * * There is already an option using abbreviation [abbr].
    */
-  void addFlag(String name, [String abbr, String help, bool defaultsTo = false,
-      bool negatable = true, void callback(bool value)]) {
+  void addFlag(String name, {String abbr, String help, bool defaultsTo: false,
+      bool negatable: true, void callback(bool value)}) {
     _addOption(name, abbr, help, null, null, defaultsTo, callback,
         isFlag: true, negatable: negatable);
   }
 
   /**
    * Defines a value-taking option. Throws an [ArgumentError] if:
    *
    * * There is already an option with name [name].
    * * There is already an option using abbreviation [abbr].
    */
   void addOption(String name, [String abbr, String help, List<String> allowed,
       Map<String, String> allowedHelp, String defaultsTo,
       void callback(value), bool allowMultiple = false]) {
     _addOption(name, abbr, help, allowed, allowedHelp, defaultsTo,
         callback, isFlag: false, allowMultiple: allowMultiple);
   }
 
   void _addOption(String name, String abbr, String help, List<String> allowed,
       Map<String, String> allowedHelp, defaultsTo,
-      void callback(value), [bool isFlag, bool negatable = false,
-      bool allowMultiple = false]) {
+      void callback(value), {bool isFlag, bool negatable: false,
+      bool allowMultiple: false}) {
     // Make sure the name isn't in use.
     if (_options.containsKey(name)) {
       throw new ArgumentError('Duplicate option "$name".');
     }
 
     // Make sure the abbreviation isn't too long or in use.
     if (abbr != null) {
       if (abbr.length > 1) {
         throw new ArgumentError(
             'Abbreviation "$abbr" is longer than one character.');
@@ skipping 287 matching lines @@
   final List allowed;
   final defaultValue;
   final Function callback;
   final String help;
   final Map<String, String> allowedHelp;
   final bool isFlag;
   final bool negatable;
   final bool allowMultiple;
 
   _Option(this.name, this.abbreviation, this.help, this.allowed,
-      this.allowedHelp, this.defaultValue, this.callback, [this.isFlag,
-      this.negatable, this.allowMultiple = false]);
+      this.allowedHelp, this.defaultValue, this.callback, {this.isFlag,
+      this.negatable, this.allowMultiple: false});
 }
 
 /**
  * Takes an [ArgParser] and generates a string of usage (i.e. help) text for its
  * defined options. Internally, it works like a tabular printer. The output is
  * divided into three horizontal columns, like so:
  *
  *     -h, --help  Prints the usage information
  *     |  |        |                                 |
  *
@@ skipping 201 matching lines @@
       allowedBuffer.add(allowed);
       if (allowed == option.defaultValue) {
         allowedBuffer.add(' (default)');
       }
       first = false;
     }
     allowedBuffer.add(']');
     return allowedBuffer.toString();
   }
 }