com.google.gwt.dev.js.ast.JsUnaryOperation Maven / Gradle / Ivy
/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.js.ast;
import com.google.gwt.dev.jjs.SourceInfo;
/**
* A JavaScript prefix or postfix operation.
*/
public abstract class JsUnaryOperation extends JsExpression {
private JsExpression arg;
private final JsUnaryOperator op;
public JsUnaryOperation(SourceInfo sourceInfo, JsUnaryOperator op) {
this(sourceInfo, op, null);
}
public JsUnaryOperation(SourceInfo sourceInfo, JsUnaryOperator op, JsExpression arg) {
super(sourceInfo);
this.op = op;
this.arg = arg;
}
public JsExpression getArg() {
return arg;
}
public JsUnaryOperator getOperator() {
return op;
}
@Override
public final boolean hasSideEffects() {
return op.isModifying() || arg.hasSideEffects();
}
public void setArg(JsExpression arg) {
this.arg = arg;
}
@Override
public void traverse(JsVisitor v, JsContext ctx) {
if (op.isModifying()) {
/*
* The delete operator is practically like an assignment of undefined, so for practical
* purposes we're treating it as an lvalue.
*/
arg = v.acceptLvalue(arg);
} else {
arg = v.accept(arg);
}
}
}