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


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 assignment expression.
38  */
39 public class AssignRefExpr extends Expr {
40   protected final AbstractVarExpr _var;
41   protected final Expr _value;
42
43   public AssignRefExpr(Location location, AbstractVarExpr var, Expr value)
44   {
45     super(location);
46     _var = var;
47     _value = value;
48   }
49
50   public AssignRefExpr(AbstractVarExpr var, Expr value)
51   {
52     _var = var;
53     _value = value;
54   }
55
56   /**
57    * Evaluates the expression.
58    *
59    * @param env the calling environment.
60    *
61    * @return the expression value.
62    */
63   public Value eval(Env env)
64   {
65     Value value = _value.evalRef(env);
66
67     _var.evalAssign(env, value);
68
69     return value;
70   }
71
72   /**
73    * Evaluates the expression.
74    *
75    * @param env the calling environment.
76    *
77    * @return the expression value.
78    */
79   public Value evalCopy(Env env)
80   {
81     Value value = _value.evalRef(env);
82
83     _var.evalAssign(env, value);
84
85     return value.copy();
86   }
87
88   public String JavaDoc toString()
89   {
90     return "(" + _var + " =& " + _value + ")";
91   }
92 }
93
94
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