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.OrAbsentExpr;
25
26 /**
27 * This class implements <code>||</code> syntax.
28 *
29 * <p>
30 * <code><expr> || <expr></code>
31 * </p>
32 *
33 * <p>
34 * The expression on the right hand side will only be executed if the left hand
35 * side returns <code>null</code>, e.g. it is equivalent to writing:
36 * <code>if x == absent then y else absent endif</code>
37 * </p>
38 *
39 * @see OrAbsentExpr
40 */
41 public final class OrAbsentSyntax extends SimplePostfixSyntax {
42
43 /**
44 * @see org.millscript.millscript.syntax.SimplePostfixSyntax#simple(org.millscript.millscript.expr.Expr, org.millscript.millscript.expr.Expr)
45 */
46 @Override
47 public OrAbsentExpr simple( final Expr lhs, final Expr rhs ) {
48 return new OrAbsentExpr( lhs, rhs );
49 }
50
51 }