Scanner for UTF-8 byte arrays

sdk/lib/_internal/compiler/implementation/tree/prettyprint.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.
 
 part of tree;
 
 /**
  * Pretty-prints Node tree in XML-like format.
  *
  * TODO(smok): Add main() to run from command-line to print out tree for given
@@ skipping 72 matching lines @@
     addTypeWithParams(tag);
     sb.write(">\n");
   }
 
   void addTypeWithParams(String type, [Map params]) {
     if (params == null) params = new Map();
     sb.write("${type}");
     params.forEach((k, v) {
       String value;
       if (v != null) {
-        value = v
+        var str = v;
+        if (v is Token) str = v.value;
+        value = str
             .replaceAll("<", "&lt;")
             .replaceAll(">", "&gt;")
             .replaceAll('"', "'");
       } else {
         value = "[null]";
       }
       sb.write(' $k="$value"');
     });
   }
 
@@ skipping 369 matching lines @@
   }
 
   visitStringNode(StringNode node) {
     unimplemented('visitNode', node: node);
   }
 
   unimplemented(String message, {Node node}) {
     throw message;
   }
 }