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.expr;
23
24 import org.millscript.millscript.action.Action;
25 import org.millscript.millscript.alert.Alerts;
26
27 /**
28 * This class represents a directive expression. A directive expression is one
29 * that gives instructions to the compiler.
30 */
31 public abstract class DirectiveExpr extends Expr< Action > {
32
33 /**
34 * Always causes a general fault, as these expressions should not exist
35 * after compilation.
36 *
37 * @return never returns, but has to return <code>null</code> to satisfy
38 * Java
39 */
40 @Override
41 public Action compileIt() {
42 throw(
43 Alerts.fault( "Nested directive" ).mishap()
44 );
45 }
46
47 }