| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * 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. |
| */ |
| |
| /* |
| * @author max |
| */ |
| package com.intellij.psi; |
| |
| import com.intellij.util.containers.Stack; |
| |
| public abstract class JavaRecursiveElementVisitor extends JavaElementVisitor { |
| // This stack thing is intended to prevent exponential child traversing due to visitReferenceExpression calls both visitRefElement |
| // and visitExpression. |
| private final Stack<PsiReferenceExpression> myRefExprsInVisit = new Stack<PsiReferenceExpression>(); |
| private final Stack<PsiBinaryExpression> myBinaryExpressions = new Stack<PsiBinaryExpression>(); |
| |
| @Override |
| public void visitElement(PsiElement element) { |
| if (!myRefExprsInVisit.isEmpty() && myRefExprsInVisit.peek() == element) { |
| myRefExprsInVisit.pop(); |
| myRefExprsInVisit.push(null); |
| } |
| else if (element instanceof PsiBinaryExpression) { |
| //implement smart traversing to avoid stack overflow |
| if (!myBinaryExpressions.isEmpty() && myBinaryExpressions.peek() == element) { |
| return; |
| } |
| PsiElement child = element.getFirstChild(); |
| while (child != null) { |
| if (child instanceof PsiBinaryExpression) { |
| myBinaryExpressions.push((PsiBinaryExpression)child); |
| } |
| child.accept(this); |
| child = child.getNextSibling(); |
| if (child == null) { |
| child = myBinaryExpressions.isEmpty() ? null : myBinaryExpressions.pop(); |
| if (child != null) child = child.getFirstChild(); |
| } |
| } |
| } |
| else { |
| element.acceptChildren(this); |
| } |
| } |
| |
| @Override public void visitReferenceExpression(PsiReferenceExpression expression) { |
| myRefExprsInVisit.push(expression); |
| try { |
| visitExpression(expression); |
| visitReferenceElement(expression); |
| } |
| finally { |
| myRefExprsInVisit.pop(); |
| } |
| } |
| } |