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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 CONTINUE statements.
33   */
34  @Immutable
35  public class ContinueNode extends Statement {
36  
37      private IdentNode label;
38  
39      /**
40       * Constructor
41       *
42       * @param lineNumber line number
43       * @param token      token
44       * @param finish     finish
45       * @param label      label for break or null if none
46       */
47      public ContinueNode(final int lineNumber, final long token, final int finish, final IdentNode label) {
48          super(lineNumber, token, finish);
49          this.label = label;
50      }
51  
52      @Override
53      public boolean hasGoto() {
54          return true;
55      }
56  
57      @Override
58      public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
59          if (visitor.enterContinueNode(this)) {
60              return visitor.leaveContinueNode(this);
61          }
62  
63          return this;
64      }
65  
66      /**
67       * Get the label for this break node
68       * @return label, or null if none
69       */
70      public IdentNode getLabel() {
71          return label;
72      }
73  
74      @Override
75      public void toString(final StringBuilder sb) {
76          sb.append("continue");
77  
78          if (label != null) {
79              sb.append(' ');
80              label.toString(sb);
81          }
82      }
83  }
84