01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Scott Ferguson
28: */
29:
30: package com.caucho.quercus.expr;
31:
32: import com.caucho.quercus.Location;
33: import com.caucho.quercus.env.Env;
34: import com.caucho.quercus.env.Value;
35:
36: /**
37: * Represents a PHP subtract expression.
38: */
39: public class SubExpr extends BinaryExpr {
40: protected SubExpr(Location location, Expr left, Expr right) {
41: super (location, left, right);
42: }
43:
44: protected SubExpr(Expr left, Expr right) {
45: super (left, right);
46: }
47:
48: /**
49: * Evaluates the expression returning the expression value.
50: *
51: * @param env the quercus environment
52: * @return the resulting value
53: */
54: public Value eval(Env env) {
55: Value lValue = _left.eval(env);
56: Value rValue = _right.eval(env);
57:
58: return lValue.sub(rValue);
59: }
60:
61: public String toString() {
62: return "(" + _left + " + " + _right + ")";
63: }
64: }
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