Parse comma-separated multiple values.

lib/src/option.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.
 
 library args.src.option;
 
 import 'dart:collection';
 
 /// Creates a new [Option].
 ///
 /// Since [Option] doesn't have a public constructor, this lets [ArgParser]
 /// get to it. This function isn't exported to the public API of the package.
 Option newOption(String name, String abbreviation, String help,
     String valueHelp, List<String> allowed, Map<String, String> allowedHelp,
     defaultValue, Function callback, OptionType type,
-    {bool negatable, bool hide: false}) {
+    {bool negatable, bool splitCommas, bool hide: false}) {
   return new Option._(name, abbreviation, help, valueHelp, allowed, allowedHelp,
-      defaultValue, callback, type, negatable: negatable, hide: hide);
+      defaultValue, callback, type, negatable: negatable,
+      splitCommas: splitCommas, hide: hide);
 }
 
 /// A command-line option. Includes both flags and options which take a value.
 class Option {
   final String name;
   final String abbreviation;
   final List<String> allowed;
   final defaultValue;
   final Function callback;
   final String help;
   final String valueHelp;
   final Map<String, String> allowedHelp;
   final OptionType type;
   final bool negatable;
+  final bool splitCommas;
   final bool hide;
 
   /// Whether the option is boolean-valued flag.
   bool get isFlag => type == OptionType.FLAG;
 
   /// Whether the option takes a single value.
   bool get isSingle => type == OptionType.SINGLE;
 
   /// Whether the option allows multiple values.
   bool get isMultiple => type == OptionType.MULTIPLE;
 
   Option._(this.name, this.abbreviation, this.help, this.valueHelp,
       List<String> allowed, Map<String, String> allowedHelp, this.defaultValue,
-      this.callback, this.type, {this.negatable, this.hide: false})
+      this.callback, OptionType type, {this.negatable, bool splitCommas,
+      this.hide: false})
       : this.allowed = allowed == null
           ? null
           : new UnmodifiableListView(allowed),
         this.allowedHelp = allowedHelp == null
             ? null
-            : new UnmodifiableMapView(allowedHelp) {
+            : new UnmodifiableMapView(allowedHelp),
+        this.type = type,
+        // If the user doesn't specify [splitCommas], it defaults to true for
+        // multiple options.
+        this.splitCommas = splitCommas == null
+            ? type == OptionType.MULTIPLE
+            : splitCommas {
     if (name.isEmpty) {
       throw new ArgumentError('Name cannot be empty.');
     } else if (name.startsWith('-')) {
       throw new ArgumentError('Name $name cannot start with "-".');
     }
 
     // Ensure name does not contain any invalid characters.
     if (_invalidChars.hasMatch(name)) {
       throw new ArgumentError('Name "$name" contains invalid characters.');
     }
@@ skipping 53 matching lines @@
   ///     --output text --output xml
   ///
   /// In the parsed [ArgResults], a multiple-valued option will always return
   /// a list, even if one or no values were passed.
   static const MULTIPLE = const OptionType._("OptionType.MULTIPLE");
 
   final String name;
 
   const OptionType._(this.name);
 }