| /* |
| * 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. |
| */ |
| |
| package com.intellij.psi.impl.source.tree; |
| |
| import com.intellij.lang.ASTNode; |
| import com.intellij.util.WalkingState; |
| import org.jetbrains.annotations.NotNull; |
| |
| public abstract class RecursiveTreeElementWalkingVisitor extends TreeElementVisitor { |
| private final boolean myDoTransform; |
| |
| protected RecursiveTreeElementWalkingVisitor() { |
| this(true); |
| } |
| |
| protected RecursiveTreeElementWalkingVisitor(boolean doTransform) { |
| myDoTransform = doTransform; |
| } |
| |
| private static class ASTTreeGuide implements WalkingState.TreeGuide<ASTNode> { |
| @Override |
| public ASTNode getNextSibling(@NotNull ASTNode element) { |
| return element.getTreeNext(); |
| } |
| |
| @Override |
| public ASTNode getPrevSibling(@NotNull ASTNode element) { |
| return element.getTreePrev(); |
| } |
| |
| @Override |
| public ASTNode getFirstChild(@NotNull ASTNode element) { |
| return element.getFirstChildNode(); |
| } |
| |
| @Override |
| public ASTNode getParent(@NotNull ASTNode element) { |
| return element.getTreeParent(); |
| } |
| |
| private static final ASTTreeGuide instance = new ASTTreeGuide(); |
| } |
| |
| private final WalkingState<ASTNode> myWalkingState = new WalkingState<ASTNode>(ASTTreeGuide.instance) { |
| @Override |
| public void elementFinished(@NotNull ASTNode element) { |
| RecursiveTreeElementWalkingVisitor.this.elementFinished(element); |
| } |
| |
| @Override |
| public void visit(@NotNull ASTNode element) { |
| ((TreeElement)element).acceptTree(RecursiveTreeElementWalkingVisitor.this); |
| } |
| }; |
| |
| protected void elementFinished(@NotNull ASTNode element) { |
| } |
| |
| @Override |
| public void visitLeaf(LeafElement leaf) { |
| visitNode(leaf); |
| } |
| |
| @Override |
| public void visitComposite(CompositeElement composite) { |
| visitNode(composite); |
| } |
| |
| protected void visitNode(TreeElement element) { |
| if (myDoTransform || !TreeUtil.isCollapsedChameleon(element)) { |
| myWalkingState.elementStarted(element); |
| } |
| } |
| |
| public void stopWalking() { |
| myWalkingState.stopWalking(); |
| } |
| } |