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1   /*
2    * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package jdk.nashorn.internal.ir;
27  
28  import jdk.nashorn.internal.ir.annotations.Immutable;
29  import jdk.nashorn.internal.ir.visitor.NodeVisitor;
30  
31  /**
32   * IR representation for an empty statement.
33   */
34  @Immutable
35  public final class EmptyNode extends Statement {
36  
37      /**
38       * Constructor
39       *
40       * @param node node to wrap
41       */
42      public EmptyNode(final Statement node) {
43          super(node);
44      }
45  
46      /**
47       * Constructor
48       *
49       * @param lineNumber line number
50       * @param token      token
51       * @param finish     finish
52       */
53      public EmptyNode(final int lineNumber, final long token, final int finish) {
54          super(lineNumber, token, finish);
55      }
56  
57  
58      @Override
59      public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
60          if (visitor.enterEmptyNode(this)) {
61              return visitor.leaveEmptyNode(this);
62          }
63          return this;
64      }
65  
66      @Override
67      public void toString(final StringBuilder sb) {
68          sb.append(';');
69      }
70  
71  }