001    /*
002     * Copyright 2010-2014 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package com.google.dart.compiler.backend.js.ast;
018    
019    import org.jetbrains.annotations.NotNull;
020    
021    public class JsEmptyExpression extends JsExpressionImpl {
022    
023        JsEmptyExpression() {
024        }
025    
026        @Override
027        @NotNull
028        public JsStatement makeStmt() {
029            return JsEmpty.INSTANCE;
030        }
031    
032        @Override
033        public void accept(JsVisitor visitor) {
034            throw new IllegalArgumentException("empty expression should not be here during generating Javascript code");
035        }
036    
037        @Override
038        public void traverse(JsVisitorWithContext visitor, JsContext ctx) {
039            throw new IllegalArgumentException("empty expression should not be here during generating Javascript code");
040        }
041    
042        @NotNull
043        @Override
044        public JsEmptyExpression deepCopy() {
045            return new JsEmptyExpression();
046        }
047    }