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/*
* 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();
}
}
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