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Java > Open Source Codes > com > caucho > quercus > expr > PostIncrementExpr


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * 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 post increment expression.
38  */
39 public class PostIncrementExpr extends UnaryExpr {
40   protected final int _incr;
41
42   public PostIncrementExpr(Location location, Expr expr, int incr)
43   {
44     // super(expr.createRef());
45 super(location, expr);
46
47     _incr = incr;
48   }
49
50   public PostIncrementExpr(Expr expr, int incr)
51   {
52     super(expr);
53
54     _incr = incr;
55   }
56
57   public Value eval(Env env)
58   {
59     Value var = _expr.evalRef(env);
60
61     return var.postincr(_incr);
62   }
63
64   /**
65    * Return true for a double value
66    */
67   public boolean isDouble()
68   {
69     return _expr.isDouble();
70   }
71
72   /**
73    * Return true for a long value
74    */
75   public boolean isLong()
76   {
77     return _expr.isLong();
78   }
79
80   /**
81    * Return true for a number
82    */
83   public boolean isNumber()
84   {
85     return true;
86   }
87
88   public String JavaDoc toString()
89   {
90     if (_incr > 0)
91       return _expr + "++";
92     else
93       return _expr + "--";
94   }
95 }
96
97
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