Implement part-of directive.

dart/lib/compiler/implementation/warnings.dart

 // Copyright (c) 2011, 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.
 
 class MessageKind {
   final String template;
   const MessageKind(this.template);
 
   static const GENERIC = const MessageKind('#{1}');
 
@@ skipping 241 matching lines @@
 
   static const CANNOT_RESOLVE_GETTER = const MessageKind(
       'cannot resolve getter.');
 
   static const CANNOT_RESOLVE_SETTER = const MessageKind(
       'cannot resolve setter.');
 
   static const VOID_NOT_ALLOWED = const MessageKind(
       'type void is only allowed in a return type.');
 
+  static const BEFORE_TOP_LEVEL = const MessageKind(
+      'Error: part header must come before top-level definitions.');

[Johnni Winther, 2012/10/09 07:43:36]

Why do some messages include 'Error:' and 'Warning:' and others not? Shouldn't
the report mechanism determine and print out the message kind?

[ahe, 2012/10/09 07:48:09]

Historic reasons.
No. That is a problem for localization.

[karlklose, 2012/10/09 07:49:47]

See also http://code.google.com/p/dart/issues/detail?id=5177

+
+  static const LIBRARY_NAME_MISMATCH = const MessageKind(
+      'Warning: expected part of library name "#{1}".');
+
+  static const DUPLICATED_PART_OF = const MessageKind(
+      'Error: duplicated part-of directive.');
+
+  static const ILLEGAL_DIRECTIVE = const MessageKind(
+      'Error: directive not allowed here.');
+
+  static const DUPLICATED_LIBRARY_NAME = const MessageKind(
+      'Warning: duplicated library name "#{1}".');
+
   static const INVALID_SOURCE_FILE_LOCATION = const MessageKind('''
 Invalid offset (#{1}) in source map.
 File: #{2}
 Length: #{3}''');
 
   static const PATCH_RETURN_TYPE_MISMATCH = const MessageKind(
       "Patch return type '#{3}' doesn't match '#{2}' on origin method '#{1}'.");
 
   static const PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH = const MessageKind(
       "Required parameter count of patch method (#{3}) doesn't match parameter "
@@ skipping 102 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }