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


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 AssignExpr extends Expr {
40   protected final AbstractVarExpr _var;
41   protected final Expr _value;
42
43   public AssignExpr(Location location, AbstractVarExpr var, Expr value)
44   {
45     super(location);
46     
47     _var = var;
48     _value = value;
49   }
50
51   public AssignExpr(AbstractVarExpr var, Expr value)
52   {
53     _var = var;
54     _value = value;
55   }
56
57   /**
58    * Creates a assignment
59    * @param location
60    */
61   @Override JavaDoc
62   public Expr createCopy(ExprFactory factory)
63   {
64     // quercus/3d9e
65 return factory.createCopy(this);
66   }
67
68   /**
69    * Evaluates the expression.
70    *
71    * @param env the calling environment.
72    *
73    * @return the expression value.
74    */
75   public Value eval(Env env)
76   {
77     Value value = _value.evalCopy(env);
78
79     _var.evalAssign(env, value);
80
81     return value;
82   }
83
84   /**
85    * Evaluates the expression.
86    *
87    * @param env the calling environment.
88    *
89    * @return the expression value.
90    */
91   public Value evalCopy(Env env)
92   {
93     // php/0d9e
94 return eval(env).copy();
95   }
96
97   /**
98    * Evaluates the expression.
99    *
100    * @param env the calling environment.
101    *
102    * @return the expression value.
103    */
104   public Value evalRef(Env env)
105   {
106     Value value = _value.eval(env);
107
108     _var.evalAssign(env, value);
109
110     return value;
111   }
112
113   public String JavaDoc toString()
114   {
115     return _var + "=" + _value;
116   }
117 }
118
119
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