Simplify the generated code for a message.

pkg/intl/lib/message_lookup_by_library.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.
 
 /**
  * Message/plural format library with locale support. This can have different
  * implementations based on the mechanism for finding the localized versions
  * of messages. This version expects them to be in a library named e.g.
  * 'messages_en_US'. The prefix is set in the "initializeMessages" call, which
  * must be made for a locale before any lookups can be done.
@@ skipping 79 matching lines @@
    * The expected usage of this is inside a function that takes as parameters
    * the variables used in the interpolated string.
    *
    * Ultimately, the information about the enclosing function and its arguments
    * will be extracted automatically but for the time being it must be passed
    * explicitly in the [name] and [args] arguments.
    */
   String lookupMessage(String message_str, [final String desc='',
       final Map examples=const {}, String locale,
       String name, List<String> args]) {
-    // If we don't have a name, return the original, and if we have
-    // been recursively invoked, also just return message_str. This
-    // happens because the replacement functions also call Intl.message,
-    // so we assume that when _lookupInProgress is true that we're
-    // already translated.
-    if (name == null || _lookupInProgress) return message_str;
-    _lookupInProgress = true;
-    // Try to apply the function holding the translated version. If there
-    // is an exception, use the original [message_str] as the result.
-    var result = message_str;
-    try {
-      var function = this[name];
-      if (function != null) result = Function.apply(function, args);
-    } finally {
-      _lookupInProgress = false;
-    }
-    return result;
+    if (name == null) return message_str;
+    var function = this[name];
+    return function == null ? message_str :  Function.apply(function, args);
   }
 
   /** Return our message with the given name */
   operator [](String messageName) => messages[messageName];
 
   /**
    * Subclasses should override this to return a list of their message
    * functions.
    */
   Map<String, Function> get messages;
 
   /** Subclasses should override this to return their locale, e.g. 'en_US' */
   String get localeName;
 
   toString() => localeName;
 }