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


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.ArrayValue;
33 import com.caucho.quercus.env.Env;
34 import com.caucho.quercus.env.NullValue;
35 import com.caucho.quercus.env.Value;
36
37 /**
38  * Represents a PHP list() = each() assignment expression.
39  */
40 public class ListEachExpr extends Expr {
41   protected final AbstractVarExpr _keyVar;
42   protected final AbstractVarExpr _valueVar;
43   protected final Expr _value;
44
45   public ListEachExpr(Expr []varList, EachExpr each)
46   {
47     if (varList.length > 0) {
48       // XXX: need test
49 _keyVar = (AbstractVarExpr) varList[0];
50     }
51     else
52       _keyVar = null;
53
54     if (varList.length > 1) {
55       // XXX: need test
56 _valueVar = (AbstractVarExpr) varList[1];
57     }
58     else
59       _valueVar = null;
60
61     _value = each.getExpr();
62   }
63
64   /**
65    * Evaluates the expression.
66    *
67    * @param env the calling environment.
68    *
69    * @return the expression value.
70    */
71   public Value eval(Env env)
72   {
73     Value value = _value.eval(env);
74
75     if (! (value instanceof ArrayValue))
76       return NullValue.NULL;
77
78     ArrayValue array = (ArrayValue) value;
79     /*
80     if (! array.hasCurrent())
81       return BooleanValue.FALSE;
82     */
83
84     if (_keyVar != null)
85       _keyVar.evalAssign(env, array.key());
86
87     if (_valueVar != null)
88       _valueVar.evalAssign(env, array.current());
89
90     return array.each();
91   }
92
93   /**
94    * Evaluates the expression.
95    *
96    * @param env the calling environment.
97    *
98    * @return the expression value.
99    */
100   public boolean evalBoolean(Env env)
101   {
102     Value value = _value.eval(env);
103
104     if (! (value instanceof ArrayValue))
105       return false;
106
107     ArrayValue array = (ArrayValue) value;
108
109     if (! array.hasCurrent())
110       return false;
111
112     if (_keyVar != null)
113       _keyVar.evalAssign(env, array.key());
114
115     if (_valueVar != null)
116       _valueVar.evalAssign(env, array.current());
117
118     array.next();
119
120     return true;
121   }
122 }
123
124
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