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


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 pre increment expression.
38  */
39 public class PreIncrementExpr extends UnaryExpr {
40   protected final int _incr;
41
42   public PreIncrementExpr(Location location, Expr expr, int incr)
43   {
44     // super(expr.createRef());
45 super(location, expr);
46
47     _incr = incr;
48   }
49
50   public PreIncrementExpr(Expr expr, int incr)
51   {
52     // super(expr.createRef());
53 super(expr);
54
55     _incr = incr;
56   }
57
58   public Value eval(Env env)
59   {
60     Value var = _expr.evalRef(env);
61
62     return var.preincr(_incr);
63   }
64
65   /**
66    * Return true for a double value
67    */
68   public boolean isDouble()
69   {
70     return _expr.isDouble();
71   }
72
73   /**
74    * Return true for a long value
75    */
76   public boolean isLong()
77   {
78     return _expr.isLong();
79   }
80
81   /**
82    * Return true for a number
83    */
84   public boolean isNumber()
85   {
86     return true;
87   }
88
89   public String JavaDoc toString()
90   {
91     if (_incr > 0)
92       return "++" + _expr;
93     else
94       return "--" + _expr;
95   }
96 }
97
98
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