Scanner for UTF-8 byte arrays

sdk/lib/_internal/compiler/implementation/source_map_builder.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 source_map_builder;
 
 
 import 'util/util.dart';
 import 'scanner/scannerlib.dart' show Token;
 import 'source_file.dart';
@@ skipping 178 matching lines @@
     return line;
   }
 
   int getColumn() => sourceFile.getColumn(getLine(), token.charOffset);
 
   String getSourceName() {
     if (token.isIdentifier()) return token.value;
     return null;
   }
 
-  bool isValid() => token.charOffset < sourceFile.text.length;
+  bool isValid() => token.charOffset < sourceFile.length;
 }