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.syntax;
22
23 import org.millscript.millscript.expr.Expr;
24 import org.millscript.millscript.expr.NoneExpr;
25
26 /**
27 * This class implements <code>none</code> syntax.
28 *
29 * <p>
30 * <code>none <expr></code>
31 * </p>
32 *
33 * <p>
34 * The right hand side expression can be anything, regardless of how many
35 * results it might return. Any results returned by the right hand side
36 * expression will be caught and discarded, so the whole expression will never
37 * generate any results.
38 * </p>
39 *
40 * @see NoneExpr
41 */
42 public final class NoneSyntax extends PrefixSyntax {
43
44 /**
45 * @see org.millscript.millscript.syntax.PrefixSyntaxInterface#prefix(java.lang.String, org.millscript.millscript.syntax.Parser)
46 */
47 @Override
48 public Expr prefix( final String sym, final Parser parser ) {
49 return NoneExpr.make( parser.readExprComma() );
50 }
51
52 }