1 ////////////////////////////////////////////////////////////////////////////////
2 // MillScript: an Open Spice interpreter and batch website creation tool
3 // Copyright (C) 2001-2004 Open World Ltd
4 //
5 // This file is part of MillScript.
6 //
7 // MillScript is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 2 of the License, or (at your option)
10 // any later version.
11 //
12 // MillScript is distributed in the hope that it will be useful, but WITHOUT
13 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 // more details.
16 //
17 // You should have received a copy of the GNU General Public License along with
18 // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
19 // Place, Suite 330, Boston, MA 02111-1307 USA
20 ////////////////////////////////////////////////////////////////////////////////
21 package org.millscript.millscript.action;
22
23 import org.millscript.millscript.vm.Machine;
24
25 /**
26 * This class represents a block action. A block is a region of code that can
27 * have local variables. This is primarily used for <code>while</code> loops
28 * and <code>if</code> statement bodies.
29 */
30 public final class BlockAction extends Action {
31
32 /**
33 * The action for the body of this block action.
34 */
35 private Action body;
36
37 /**
38 * Constructs a new block action, which will perform the specified action
39 * as its body.
40 *
41 * @param a the body action for this block
42 */
43 public BlockAction( final Action a ) {
44 this.body = a;
45 }
46
47 /**
48 * @see org.millscript.millscript.action.Action#action(org.millscript.millscript.vm.Machine)
49 */
50 @Override
51 public void action( final Machine mc ) {
52 // Start saving variables
53 mc.startSaving();
54 // Perform the body of this block
55 body.act( mc );
56 // Restore any previous values for local? variables
57 mc.restoreSaved();
58 }
59
60 }