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.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;
26:
27: /**
28: * Represents multiple ordered expressions as a single compound expression.
29: */
30: public class JMultiExpression extends JExpression {
31:
32: public ArrayList<JExpression> exprs = new ArrayList<JExpression>();
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 exprs.get(c - 1).getType();
44: }
45: }
46:
47: @Override
48: public boolean hasSideEffects() {
49: for (int i = 0; i < exprs.size(); ++i) {
50: JExpression expr = exprs.get(i);
51: if (expr.hasSideEffects()) {
52: return true;
53: }
54: }
55: return false;
56: }
57:
58: public void traverse(JVisitor visitor, Context ctx) {
59: if (visitor.visit(this, ctx)) {
60: visitor.acceptWithInsertRemove(exprs);
61: }
62: visitor.endVisit(this, ctx);
63: }
64:
65: }
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