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Java > Open Source Codes > com > google > gwt > dev > js > ast > JsExpression


1 /*
2  * Copyright 2007 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.dev.js.ast;
17
18 /**
19  * An abstract base class for all JavaScript expressions.
20  */
21 public abstract class JsExpression extends JsNode {
22   /**
23    * Determines whether or not this expression is a leaf, such as a
24    * {@link JsNameRef}, {@link JsBooleanLiteral}, and so on. Leaf expressions
25    * never need to be parenthesized.
26    */
27   public boolean isLeaf() {
28     // Conservatively say that it isn't a leaf.
29 // Individual subclasses can speak for themselves if they are a leaf.
30 //
31 return false;
32   }
33
34   public JsExprStmt makeStmt() {
35     return new JsExprStmt(this);
36   }
37 }
38
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