Format enums. Fix #120.

lib/src/dart_formatter.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 dart_style.src.code_formatter;
 
 import 'package:analyzer/src/string_source.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 129 matching lines @@
       } else {
         lineEnding = "\n";
       }
     }
 
     errorListener.throwIfErrors();
 
     // Parse it.
     var parser = new Parser(stringSource, errorListener);
     parser.parseAsync = true;
+    parser.parseEnum = true;

[pquitslund, 2015/01/08 04:49:25]

Depending on what version of the analyzer we're pulling in, these bits may not
be necessary.  IOW: they may be on by default.

[Bob Nystrom, 2015/01/08 17:35:35]

Right now dart_style is constrained to an older version of the analyzer that
does still require these. Today, if you have the time, you and Brian and I
should sort out what constraint dart_style should have. I'll follow up with you
guys on the other email thread about it.

 
     var node;
     if (source.isCompilationUnit) {
       node = parser.parseCompilationUnit(startToken);
     } else {
       node = parser.parseStatement(startToken);
     }
 
     errorListener.throwIfErrors();
 
     // Format it.
     var visitor = new SourceVisitor(this, lineInfo, source);
     return visitor.run(node);
   }
 }