1 ////////////////////////////////////////////////////////////////////////////////
2 // MillScript: an Open Spice interpreter and batch website creation tool
3 // Copyright (C) 2001-2004 Open World Ltd
4 // Copyright (C) 2005 Kevin Rogers
5 //
6 // This file is part of MillScript.
7 //
8 // MillScript is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU General Public License as published by the Free
10 // Software Foundation; either version 2 of the License, or (at your option)
11 // any later version.
12 //
13 // MillScript is distributed in the hope that it will be useful, but WITHOUT
14 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 // more details.
17 //
18 // You should have received a copy of the GNU General Public License along with
19 // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
20 // Place, Suite 330, Boston, MA 02111-1307 USA
21 ////////////////////////////////////////////////////////////////////////////////
22 package org.millscript.millscript.action;
23
24 import org.millscript.commons.util.list.IArrayList;
25 import org.millscript.millscript.vm.Machine;
26
27 /**
28 * This class represents the action for a list expression.
29 *
30 * @see org.millscript.millscript.expr.ListExpr
31 * @see org.millscript.millscript.syntax.ListSyntax
32 */
33 public final class ListAction extends Action {
34
35 /**
36 * The action that generate values for the list.
37 */
38 private Action body;
39
40 /**
41 * Constructs a new list action, to make a list containing the values
42 * generated by the specified body action.
43 *
44 * @param a the action generating results for the list
45 */
46 public ListAction( final Action a ) {
47 body = a;
48 }
49
50 /**
51 * @see org.millscript.millscript.action.Action#action(org.millscript.millscript.vm.Machine)
52 */
53 @Override
54 public void action( final Machine mc ) {
55 // Store the number of values on the stack, before generating the
56 // values for the list
57 int n = mc.getCount();
58 // Generate the results for the list
59 body.act( mc );
60 // Calculate how many results there are, i.e. the size of the list, and
61 // get an array of that number of values off the stack
62 mc.pushObject(
63 new IArrayList< Object >(
64 mc.popArgsArray( mc.getCount() - n ),
65 true
66 )
67 );
68 }
69
70 }