/*
* 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.CodeVisitorSupport;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
/**
* This class is a place holder for an empty expression.
* Empty expression are used in closures lists like (;). During
* class Generation this expression should be either ignored or
* replace with a null value.
*
* @author Jochen Theodorou
* @see org.codehaus.groovy.ast.stmt.EmptyStatement
*/
public class EmptyExpression extends Expression {
public static final EmptyExpression INSTANCE = new EmptyExpression();
public Expression transformExpression(ExpressionTransformer transformer) {
return this;
}
public void visit(GroovyCodeVisitor visitor) {
// GRECLIPSE start:
if (visitor instanceof CodeVisitorSupport) {
((CodeVisitorSupport) visitor).visitEmptyExpression(this);
}
// GRECLIPSE end
return;
}
}