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/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.ast.expr;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.Variable;
/**
* Represents a local variable name, the simplest form of expression. e.g. "foo".
*
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
* @version $Revision: 12194 $
*/
public class VariableExpression extends Expression implements Variable {
// The following fields are only used internally; every occurrence of a user-defined expression of the same kind
// has its own instance so as to preserve line information. Consequently, to test for such an expression, don't
// compare against the field but call isXXXExpression() instead.
public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", ClassHelper.DYNAMIC_TYPE);
public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", ClassHelper.DYNAMIC_TYPE);
private String variable;
private boolean inStaticContext;
private boolean isDynamicTyped=false;
private Variable accessedVariable;
boolean closureShare=false;
private ClassNode originType;
public Variable getAccessedVariable() {
return accessedVariable;
}
public void setAccessedVariable(Variable origin) {
this.accessedVariable = origin;
}
public VariableExpression(String variable, ClassNode type) {
this.variable = variable;
originType = type;
setType(ClassHelper.getWrapper(type));
}
public VariableExpression(String variable) {
this(variable, ClassHelper.DYNAMIC_TYPE);
}
public VariableExpression(Variable variable) {
this(variable.getName(), variable.getOriginType());
setAccessedVariable(variable);
}
public void visit(GroovyCodeVisitor visitor) {
visitor.visitVariableExpression(this);
}
public Expression transformExpression(ExpressionTransformer transformer) {
return this;
}
public String getText() {
return variable;
}
public String getName() {
return variable;
}
/**
* @return true if this variable is dynamically typed
*/
public String toString() {
return super.toString() + "[variable: " + variable + (this.isDynamicTyped() ? "" : " type: " + getType()) + "]";
}
public Expression getInitialExpression() {
return null;
}
public boolean hasInitialExpression() {
return false;
}
public boolean isInStaticContext() {
if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isInStaticContext();
return inStaticContext;
}
public void setInStaticContext(boolean inStaticContext) {
this.inStaticContext = inStaticContext;
}
public void setType(ClassNode cn){
super.setType(cn);
isDynamicTyped |= ClassHelper.DYNAMIC_TYPE==cn;
}
public boolean isDynamicTyped() {
return isDynamicTyped;
}
public boolean isClosureSharedVariable() {
if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isClosureSharedVariable();
return closureShare;
}
public void setClosureSharedVariable(boolean inClosure) {
closureShare = inClosure;
}
public ClassNode getType() {
if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getType();
return super.getType();
}
public ClassNode getOriginType() {
return originType;
}
public boolean isThisExpression() {
return "this".equals(variable);
}
public boolean isSuperExpression() {
return "super".equals(variable);
}
}
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