01: /*
02: * Copyright 2007 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License. You may obtain a copy of
06: * the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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<JsExpression> {
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: }
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