Create a new AstFactory class to be used by analyzer and its clients.

pkg/analyzer/lib/dart/ast/comment_type.dart

Index: pkg/analyzer/lib/dart/ast/comment_type.dart
diff --git a/pkg/analyzer/lib/dart/ast/comment_type.dart b/pkg/analyzer/lib/dart/ast/comment_type.dart
new file mode 100644
index 0000000000000000000000000000000000000000..fb9c4da349768e6320515841ac7c9b2eb90030cb
--- /dev/null
+++ b/pkg/analyzer/lib/dart/ast/comment_type.dart
@@ -0,0 +1,36 @@
+// Copyright (c) 2016, 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.
+
+/**
+ * The possible types of comments that are recognized by the parser.
+ */
+class CommentType {
+  /**
+   * A block comment.
+   */
+  static const CommentType BLOCK = const CommentType('BLOCK');
+
+  /**
+   * A documentation comment.
+   */
+  static const CommentType DOCUMENTATION = const CommentType('DOCUMENTATION');
+
+  /**
+   * An end-of-line comment.
+   */
+  static const CommentType END_OF_LINE = const CommentType('END_OF_LINE');
+
+  /**
+   * The name of the comment type.
+   */
+  final String name;
+
+  /**
+   * Initialize a newly created comment type to have the given [name].
+   */
+  const CommentType(this.name);
+
+  @override
+  String toString() => name;
+}