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1   /*
2    $Id: VariableScope.java,v 1.6 2006/01/19 00:06:51 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
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21      permission of The Codehaus.  For written permission,
22      please contact info@codehaus.org.
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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
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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
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35   FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
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44  
45   */
46  package org.codehaus.groovy.ast;
47  
48  import java.util.HashMap;
49  import java.util.Map;
50  
51  /***
52   * Represents a variable scope. This is primarily used to determine variable sharing
53   * across method and closure boundaries.
54   *
55   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
56   * @author Jochen Theodorou
57   * @version $Revision: 1.6 $
58   */
59  public class VariableScope  {
60      private Map declaredVariables = new HashMap();
61      private Map referencedLocalVariables = new HashMap();
62      private Map referencedClassVariables = new HashMap();
63   
64      private boolean inStaticContext = false;
65      private boolean resolvesDynamic = false; 
66      private ClassNode clazzScope;
67      private VariableScope parent;
68  
69      public VariableScope() {
70      }
71      public VariableScope(VariableScope parent) {
72          this.parent = parent;
73      }
74      public Map getDeclaredVariables() {
75          return declaredVariables;
76      }
77      public Variable getDeclaredVariable(String name) {
78          return (Variable) declaredVariables.get(name);
79      }
80      public Map getReferencedLocalVariables() {
81          return referencedLocalVariables;
82      }
83      
84      public boolean isReferencedLocalVariable(String name) {
85          return referencedLocalVariables.containsKey(name);
86      }
87      
88      public Map getReferencedClassVariables() {
89          return referencedClassVariables;
90      }
91      
92      public boolean isReferencedClassVariable(String name) {
93          return referencedClassVariables.containsKey(name);
94      }
95      public VariableScope getParent() {
96          return parent;
97      }
98  
99      public boolean isInStaticContext() {
100         return inStaticContext;
101     }
102 
103     public void setInStaticContext(boolean inStaticContext) {
104         this.inStaticContext = inStaticContext;
105     }
106 
107     public boolean isResolvingDynamic() {
108         return resolvesDynamic;
109     }
110 
111     public void setDynamicResolving(boolean resolvesDynamic) {
112         this.resolvesDynamic = resolvesDynamic;
113     }
114 
115     public void setClassScope(ClassNode node) {
116         this.clazzScope = node;
117     }
118     
119     public ClassNode getClassScope(){
120         return clazzScope;
121     }
122     
123     public boolean isClassScope(){
124         return clazzScope!=null;
125     }
126     
127     public boolean isRoot() {
128         return parent==null;
129     }
130     
131     public VariableScope copy() {
132         VariableScope copy = new VariableScope();
133         copy.clazzScope = clazzScope;
134         copy.declaredVariables.putAll(declaredVariables);
135         copy.inStaticContext = inStaticContext;
136         copy.parent = parent;
137         copy.referencedClassVariables.putAll(referencedClassVariables);
138         copy.referencedLocalVariables.putAll(referencedLocalVariables);
139         copy.resolvesDynamic = resolvesDynamic;
140         return copy;
141     }
142 }