| /******************************************************************************* |
| * Copyright (c) 2012 NumberFour AG |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * NumberFour AG - initial API and Implementation (Alex Panchenko) |
| *******************************************************************************/ |
| package org.eclipse.dltk.internal.javascript.parser.structure; |
| |
| import org.eclipse.dltk.javascript.structure.IStructureContext; |
| import org.eclipse.dltk.utils.IntList; |
| |
| public class StructureContext implements IStructureContext { |
| |
| private int currentMask; |
| private final IntList masks = new IntList(); |
| |
| public boolean allow(int mask) { |
| return (currentMask & mask) == 0; |
| } |
| |
| public void pushMask(int mask) { |
| masks.add(currentMask); |
| currentMask |= mask; |
| } |
| |
| public void popMask() { |
| currentMask = masks.removeAt(masks.size() - 1); |
| } |
| |
| } |