Library privacy.

dart/frog/leg/scanner/token.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.
 
 final int EOF_TOKEN = 0;
 
 final int KEYWORD_TOKEN = $k;
 final int IDENTIFIER_TOKEN = $a;
 final int DOUBLE_TOKEN = $d;
 final int INT_TOKEN = $i;
@@ skipping 122 matching lines @@
 
   /** Gives a [SourceString] that is not including the [initial] first and
    * [terminal] last characters. This is only intended to be used to remove
    * quotes from string literals (including an initial '@' for raw strings).
    */
   SourceString copyWithoutQuotes(int initial, int terminal);
 
   String get stringValue();
 
   bool isEmpty();
+
+  bool isPrivate();
 }
 
 class StringWrapper implements SourceString {
   final String stringValue;
 
   const StringWrapper(String this.stringValue);
 
   int hashCode() => stringValue.hashCode();
 
   bool operator ==(other) {
@@ skipping 12 matching lines @@
 
   SourceString copyWithoutQuotes(int initial, int terminal) {
     assert(0 <= initial);
     assert(0 <= terminal);
     assert(initial + terminal <= stringValue.length);
     return new StringWrapper(
         stringValue.substring(initial, stringValue.length - terminal));
   }
 
   bool isEmpty() => stringValue.isEmpty();
+
+  bool isPrivate() => !isEmpty() && stringValue.charCodeAt(0) === $_;
 }
 
 class StringCodeIterator implements Iterator<int> {
   final String string;
   int index;
   final int end;
 
   StringCodeIterator(String string) :
     this.string = string, index = 0, end = string.length;
 
@@ skipping 239 matching lines @@
 final PrecedenceInfo STRING_INTERPOLATION_INFO =
   const PrecedenceInfo(const SourceString('\${'), 0,
                        STRING_INTERPOLATION_TOKEN);
 
 final PrecedenceInfo HEXADECIMAL_INFO =
   const PrecedenceInfo(const SourceString('hexadecimal'), 0, HEXADECIMAL_TOKEN);
 
 // For reporting lexical errors.
 final PrecedenceInfo ERROR_INFO =
   const PrecedenceInfo(const SourceString('?'), 0, UNKNOWN_TOKEN);