001 /*
002 $Id: VariableExpression.java 3419 2006-01-19 00:07:02Z blackdrag $
003
004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005
006 Redistribution and use of this software and associated documentation
007 ("Software"), with or without modification, are permitted provided
008 that the following conditions are met:
009
010 1. Redistributions of source code must retain copyright
011 statements and notices. Redistributions must also contain a
012 copy of this document.
013
014 2. Redistributions in binary form must reproduce the
015 above copyright notice, this list of conditions and the
016 following disclaimer in the documentation and/or other
017 materials provided with the distribution.
018
019 3. The name "groovy" must not be used to endorse or promote
020 products derived from this Software without prior written
021 permission of The Codehaus. For written permission,
022 please contact info@codehaus.org.
023
024 4. Products derived from this Software may not be called "groovy"
025 nor may "groovy" appear in their names without prior written
026 permission of The Codehaus. "groovy" is a registered
027 trademark of The Codehaus.
028
029 5. Due credit should be given to The Codehaus -
030 http://groovy.codehaus.org/
031
032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043 OF THE POSSIBILITY OF SUCH DAMAGE.
044
045 */
046 package org.codehaus.groovy.ast.expr;
047
048 import org.codehaus.groovy.ast.ClassHelper;
049 import org.codehaus.groovy.ast.ClassNode;
050 import org.codehaus.groovy.ast.GroovyCodeVisitor;
051 import org.codehaus.groovy.ast.Variable;
052
053 /**
054 * Represents a local variable name, the simplest form of expression. e.g. "foo".
055 *
056 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057 * @version $Revision: 3419 $
058 */
059 public class VariableExpression extends Expression implements Variable {
060
061 public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", ClassHelper.DYNAMIC_TYPE);
062 public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", ClassHelper.DYNAMIC_TYPE);
063
064 private String variable;
065 private boolean inStaticContext;
066 private boolean isDynamicTyped=false;
067 private Variable accessedVariable;
068 boolean closureShare=false;
069
070 public Variable getAccessedVariable() {
071 return accessedVariable;
072 }
073
074 public void setAccessedVariable(Variable origin) {
075 this.accessedVariable = origin;
076 }
077
078 public VariableExpression(String variable, ClassNode type) {
079 this.variable = variable;
080 super.setType(ClassHelper.getWrapper(type));
081 }
082
083 public VariableExpression(String variable) {
084 this(variable, ClassHelper.DYNAMIC_TYPE);
085 }
086
087 public VariableExpression(Variable variable) {
088 this(variable.getName(), variable.getType());
089 setAccessedVariable(variable);
090 }
091
092 public void visit(GroovyCodeVisitor visitor) {
093 visitor.visitVariableExpression(this);
094 }
095
096 public Expression transformExpression(ExpressionTransformer transformer) {
097 return this;
098 }
099
100 public String getText() {
101 return variable;
102 }
103
104 public String getName() {
105 return variable;
106 }
107
108 /**
109 * @return true if this variable is dynamically typed
110 */
111 public String toString() {
112 return super.toString() + "[variable: " + variable + (this.isDynamicTyped() ? "" : " type: " + getType()) + "]";
113 }
114
115 public Expression getInitialExpression() {
116 return null;
117 }
118
119 public boolean hasInitialExpression() {
120 return false;
121 }
122
123 public boolean isInStaticContext() {
124 if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isInStaticContext();
125 return inStaticContext;
126 }
127
128 public void setInStaticContext(boolean inStaticContext) {
129 this.inStaticContext = inStaticContext;
130 }
131
132 public void setType(ClassNode cn){
133 super.setType(cn);
134 isDynamicTyped |= ClassHelper.DYNAMIC_TYPE==cn;
135 }
136
137 public boolean isDynamicTyped() {
138 return isDynamicTyped;
139 }
140
141 public boolean isClosureSharedVariable() {
142 if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isClosureSharedVariable();
143 return closureShare;
144 }
145
146 public void setClosureSharedVariable(boolean inClosure) {
147 closureShare = inClosure;
148 }
149
150 public ClassNode getType() {
151 if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getType();
152 return super.getType();
153 }
154 }