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


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.env.Env;
33 import com.caucho.quercus.env.Value;
34
35 /**
36  * Represents a PHP list assignment expression.
37  */
38 public class ListExpr extends Expr {
39   protected final ListHeadExpr _listHead;
40   protected final Expr _value;
41
42   protected ListExpr(ListHeadExpr head, Expr value)
43   {
44     _listHead = head;
45
46     _value = value;
47   }
48
49   /*
50   public static Expr create(QuercusParser parser,
51                             ListHeadExpr head, Expr value)
52     throws IOException
53   {
54     boolean isSuppress = value instanceof SuppressErrorExpr;
55
56     if (isSuppress) {
57       SuppressErrorExpr suppressExpr = (SuppressErrorExpr) value;
58
59       value = suppressExpr.getExpr();
60     }
61
62     Expr expr;
63
64     if (value instanceof EachExpr) {
65       expr = new ListEachExpr(parser.getLocation(), head.getVarList(), (EachExpr) value);
66     }
67     else
68       expr = new ListExpr(head, value);
69
70     if (isSuppress)
71       return new SuppressErrorExpr(expr.getLocation(), expr);
72     else
73       return expr;
74   }
75   */
76
77   /**
78    * Evaluates the expression.
79    *
80    * @param env the calling environment.
81    *
82    * @return the expression value.
83    */
84   public Value eval(Env env)
85   {
86     Value value = _value.eval(env);
87
88     _listHead.evalAssign(env, value);
89
90     return value;
91   }
92
93   /**
94    * Evaluates the expression.
95    *
96    * @param env the calling environment.
97    *
98    * @return the expression value.
99    */
100   public Value evalCopy(Env env)
101   {
102     return eval(env).copy();
103   }
104 }
105
106
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