| /******************************************************************************* |
| * Copyright (c) 2008, 2009 Wind River Systems, Inc. and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Markus Schorn - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.cdt.internal.core.dom.parser; |
| |
| import org.eclipse.cdt.core.dom.ast.ASTGenericVisitor; |
| import org.eclipse.cdt.core.dom.ast.IASTNode; |
| |
| /** |
| * Utility class to search for siblings of an ast node |
| */ |
| public class ASTNodeSearch extends ASTGenericVisitor { |
| private static final int LEFT = 0; |
| private static final int RIGHT = 1; |
| private int fMode; |
| private IASTNode fLeft; |
| private IASTNode fRight; |
| private final IASTNode fNode; |
| private final IASTNode fParent; |
| |
| public ASTNodeSearch(IASTNode node) { |
| super(true); |
| fNode = node; |
| fParent = node.getParent(); |
| } |
| |
| public IASTNode findLeftSibling() { |
| if (fParent == null) |
| return null; |
| |
| fMode = LEFT; |
| fLeft = fRight = null; |
| fParent.accept(this); |
| return fLeft; |
| } |
| |
| public IASTNode findRightSibling() { |
| if (fParent == null) |
| return null; |
| |
| fMode = RIGHT; |
| fLeft = fRight = null; |
| fParent.accept(this); |
| return fRight; |
| } |
| |
| @Override |
| protected int genericVisit(IASTNode node) { |
| if (node == fParent) |
| return PROCESS_CONTINUE; |
| |
| switch (fMode) { |
| case LEFT: |
| if (node == fNode) |
| return PROCESS_ABORT; |
| fLeft = node; |
| return PROCESS_SKIP; |
| case RIGHT: |
| if (node == fNode) { |
| fLeft = fNode; |
| } else if (fLeft != null) { |
| fRight = node; |
| return PROCESS_ABORT; |
| } |
| return PROCESS_SKIP; |
| } |
| return PROCESS_SKIP; |
| } |
| } |