Add a limited version of ParameterMirrors that can only tell whether they are

lib/mirrors/mirrors.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.
 
 // #library("mirrors");
 
 // The dart:mirrors library provides reflective access for Dart program.
 //
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
@@ skipping 337 matching lines @@
 
   /**
    * Does this mirror reflect a redirecting constructor?
    */
   bool isRedirectingConstructor;
 
   /**
    * Does this mirror reflect a factory constructor?
    */
   bool isFactoryConstructor;
+
+  /**
+   * Returns the list of parameters for this method.
+   */
+  List<ParameterMirror> parameters();
 }
 
+/**
+ * A formal parameter.

[turnidge, 2012/07/13 23:37:12]

Make this comment look more like others in the file.

/*
 *A [Blah] is a blah.

+ */
+interface ParameterMirror extends VariableMirror {
+  /**
+   * Returns the type of this parameter.
+   */
+  TypeMirror type();
+
+  /**
+   * Returns the default value for this parameter.
+   */
+  String defaultValue();
+
+  /**
+   * Returns true if this parameter has a default value.
+   */
+  bool hasDefaultValue();
+
+  /**
+   * Returns true if this parameter is optional.
+   */
+  bool isOptional();
+}
 
 /**
  * A [VariableMirror] reflects a Dart language variable.
  */
 interface VariableMirror {
   /**
    * The name of this variable
    */
   final String simpleName;
 
@@ skipping 100 matching lines @@
 
 /**
  * A [MirrorException] is used to indicate errors within the mirrors
  * framework.
  */
 class MirrorException implements Exception {
   const MirrorException(String this._message);
   String toString() => "MirrorException: '$_message'";
   final String _message;
 }