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/*
* Copyright 2003-2014 Dave Griffith, Bas Leijdekkers
*
* 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.siyeh.ig.psiutils;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;
public class SideEffectChecker {
private SideEffectChecker() {
super();
}
public static boolean mayHaveSideEffects(@NotNull PsiExpression exp) {
final SideEffectsVisitor visitor = new SideEffectsVisitor();
exp.accept(visitor);
return visitor.mayHaveSideEffects();
}
private static class SideEffectsVisitor extends JavaRecursiveElementWalkingVisitor {
private boolean mayHaveSideEffects = false;
@Override
public void visitElement(@NotNull PsiElement element) {
if (!mayHaveSideEffects) {
super.visitElement(element);
}
}
@Override
public void visitAssignmentExpression(
@NotNull PsiAssignmentExpression expression) {
if (mayHaveSideEffects) {
return;
}
super.visitAssignmentExpression(expression);
mayHaveSideEffects = true;
}
@Override
public void visitMethodCallExpression(
@NotNull PsiMethodCallExpression expression) {
if (mayHaveSideEffects) {
return;
}
super.visitMethodCallExpression(expression);
mayHaveSideEffects = true;
}
@Override
public void visitNewExpression(@NotNull PsiNewExpression expression) {
if (mayHaveSideEffects) {
return;
}
super.visitNewExpression(expression);
mayHaveSideEffects = true;
}
@Override
public void visitPostfixExpression(
@NotNull PsiPostfixExpression expression) {
if (mayHaveSideEffects) {
return;
}
super.visitPostfixExpression(expression);
final IElementType tokenType = expression.getOperationTokenType();
if (tokenType.equals(JavaTokenType.PLUSPLUS) ||
tokenType.equals(JavaTokenType.MINUSMINUS)) {
mayHaveSideEffects = true;
}
}
@Override
public void visitPrefixExpression(
@NotNull PsiPrefixExpression expression) {
if (mayHaveSideEffects) {
return;
}
super.visitPrefixExpression(expression);
final IElementType tokenType = expression.getOperationTokenType();
if (tokenType.equals(JavaTokenType.PLUSPLUS) ||
tokenType.equals(JavaTokenType.MINUSMINUS)) {
mayHaveSideEffects = true;
}
}
public boolean mayHaveSideEffects() {
return mayHaveSideEffects;
}
}
}
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