[html5lib] implement querySelector/querySelectorAll

pkg/csslib/lib/src/token.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 csslib.parser;
 
 /**
  * A single token in the Dart language.
  */
 class Token {
@@ skipping 33 matching lines @@
 class LiteralToken extends Token {
   var value;
   LiteralToken(int kind, Span span, this.value) : super(kind, span);
 }
 
 /** A token containing error information. */
 class ErrorToken extends Token {
   String message;
   ErrorToken(int kind, Span span, this.message) : super(kind, span);
 }
+
+/**
+ * CSS ident-token.
+ *
+ * See <http://dev.w3.org/csswg/css-syntax/#typedef-ident-token> and
+ * <http://dev.w3.org/csswg/css-syntax/#ident-token-diagram>.
+ */
+class IdentifierToken extends Token {
+  final String text;
+
+  IdentifierToken(this.text, int kind, Span span)
+      : super(kind, span);
+}