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Java > Open Source Codes > com > google > gwt > dev > jjs > ast > js > JMultiExpression


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.jjs.ast.js;
17
18 import com.google.gwt.dev.jjs.SourceInfo;
19 import com.google.gwt.dev.jjs.ast.Context;
20 import com.google.gwt.dev.jjs.ast.JExpression;
21 import com.google.gwt.dev.jjs.ast.JProgram;
22 import com.google.gwt.dev.jjs.ast.JType;
23 import com.google.gwt.dev.jjs.ast.JVisitor;
24
25 import java.util.ArrayList JavaDoc;
26
27 /**
28  * Represents multiple ordered expressions as a single compound expression.
29  */
30 public class JMultiExpression extends JExpression {
31
32   public ArrayList JavaDoc exprs = new ArrayList JavaDoc();
33
34   public JMultiExpression(JProgram program, SourceInfo info) {
35     super(program, info);
36   }
37
38   public JType getType() {
39     int c = exprs.size();
40     if (c == 0) {
41       return program.getTypeVoid();
42     } else {
43       return ((JExpression) exprs.get(c - 1)).getType();
44     }
45   }
46
47   public boolean hasSideEffects() {
48     for (int i = 0; i < exprs.size(); ++i) {
49       JExpression expr = (JExpression) exprs.get(i);
50       if (expr.hasSideEffects()) {
51         return true;
52       }
53     }
54     return false;
55   }
56
57   public void traverse(JVisitor visitor, Context ctx) {
58     if (visitor.visit(this, ctx)) {
59       visitor.acceptWithInsertRemove(exprs);
60     }
61     visitor.endVisit(this, ctx);
62   }
63
64 }
65
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