Added .scss transform

pkg/csslib/lib/parser.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 csslib.parser;
 
+import 'dart:async';
 import 'dart:math' as math;
 
+import 'package:barback/barback.dart';

[Siggi Cherem (dart-lang), 2013/09/08 20:31:33]

note barback.dart depends on dart:io, so you might want to pull the transformer
code to be on a separate library.

(I thought so far you needed to have the parser independent of dart:io so it
could be used in the client-side.)

+
 import 'package:source_maps/span.dart' show SourceFile, Span, FileSpan;
 
 import "visitor.dart";
 import 'src/messages.dart';
 import 'src/options.dart';
 
 part 'src/analyzer.dart';
 part 'src/property.dart';
 part 'src/token.dart';
 part 'src/tokenizer_base.dart';
 part 'src/tokenizer.dart';
 part 'src/tokenkind.dart';
 
-
 /** Used for parser lookup ahead (used for nested selectors Less support). */
 class ParserState extends TokenizerState {
   final Token peekToken;
   final Token previousToken;
 
   ParserState(this.peekToken, this.previousToken, Tokenizer tokenizer)
       : super(tokenizer);
 }
 
 void _createMessages({List errors, List options}) {
@@ skipping 2360 matching lines @@
 
     if (replace != null && result == null) {
       result = new StringBuffer(text.substring(0, i));
     }
 
     if (result != null) result.write(replace != null ? replace : text[i]);
   }
 
   return result == null ? text : result.toString();
 }