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1   /*
2    $Id: VariableExpression.java,v 1.13 2005/11/13 16:42:09 blackdrag Exp $
3   
4    Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5   
6    Redistribution and use of this software and associated documentation
7    ("Software"), with or without modification, are permitted provided
8    that the following conditions are met:
9   
10   1. Redistributions of source code must retain copyright
11      statements and notices.  Redistributions must also contain a
12      copy of this document.
13  
14   2. Redistributions in binary form must reproduce the
15      above copyright notice, this list of conditions and the
16      following disclaimer in the documentation and/or other
17      materials provided with the distribution.
18  
19   3. The name "groovy" must not be used to endorse or promote
20      products derived from this Software without prior written
21      permission of The Codehaus.  For written permission,
22      please contact info@codehaus.org.
23  
24   4. Products derived from this Software may not be called "groovy"
25      nor may "groovy" appear in their names without prior written
26      permission of The Codehaus. "groovy" is a registered
27      trademark of The Codehaus.
28  
29   5. Due credit should be given to The Codehaus -
30      http://groovy.codehaus.org/
31  
32   THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33   ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34   NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35   FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
36   THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43   OF THE POSSIBILITY OF SUCH DAMAGE.
44  
45   */
46  package org.codehaus.groovy.ast.expr;
47  
48  import org.codehaus.groovy.ast.ClassHelper;
49  import org.codehaus.groovy.ast.ClassNode;
50  import org.codehaus.groovy.ast.GroovyCodeVisitor;
51  import org.codehaus.groovy.ast.Variable;
52  
53  /***
54   * Represents a local variable name, the simplest form of expression. e.g. "foo".
55   * 
56   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
57   * @version $Revision: 1.13 $
58   */
59  public class VariableExpression extends Expression implements Variable {
60  
61      public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", ClassHelper.DYNAMIC_TYPE);
62      public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", ClassHelper.DYNAMIC_TYPE);
63  
64      private String variable;
65      private boolean inStaticContext;
66      private boolean isDynamicTyped=false;
67  
68      public VariableExpression(String variable, ClassNode type) {
69          this.variable = variable;
70          super.setType(ClassHelper.getWrapper(type));
71      }
72      
73      public VariableExpression(String variable) {
74          this(variable, ClassHelper.DYNAMIC_TYPE);
75      }
76  
77      public void visit(GroovyCodeVisitor visitor) {
78          visitor.visitVariableExpression(this);
79      }
80  
81      public Expression transformExpression(ExpressionTransformer transformer) {
82          return this;
83      }
84  
85      public String getText() {
86          return variable;
87      }
88      
89      public String getName() {
90          return variable;
91      }
92  
93      /***
94       * @return true if this variable is dynamically typed
95       */
96      public String toString() {
97          return super.toString() + "[variable: " + variable + (this.isDynamicTyped() ? "" : " type: " + getType()) + "]";
98      }
99  
100     public Expression getInitialExpression() {
101         return null;
102     }
103 
104     public boolean hasInitialExpression() {
105         return false;
106     }
107     
108     public boolean isInStaticContext() {
109         return inStaticContext;
110     }
111     
112     public void setInStaticContext(boolean inStaticContext) {
113         this.inStaticContext = inStaticContext;
114     }
115 
116     public void setType(ClassNode cn){
117         super.setType(cn);
118         isDynamicTyped |= ClassHelper.DYNAMIC_TYPE==cn;
119     }
120     
121     public boolean isDynamicTyped() {
122         return isDynamicTyped;
123     }
124 }