| /******************************************************************************* |
| * Copyright (c) 2019, 2020 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.text; |
| |
| import org.eclipse.jface.text.BadPositionCategoryException; |
| import org.eclipse.jface.text.DocumentEvent; |
| import org.eclipse.jface.text.ITypedRegion; |
| import org.eclipse.jface.text.rules.FastPartitioner; |
| import org.eclipse.jface.text.rules.IPartitionTokenScanner; |
| |
| public class FastJavaPartitioner extends FastPartitioner { |
| |
| |
| private boolean fIsTextBlockSupported= false; |
| |
| public FastJavaPartitioner(IPartitionTokenScanner scanner, String[] legalContentTypes) { |
| super(scanner, legalContentTypes); |
| } |
| |
| @Override |
| protected void initialize() { |
| super.initialize(); |
| fIsTextBlockSupported= isTextBlockSupported(); |
| } |
| |
| public void resetPositionCache() { |
| clearPositionCache(); |
| } |
| |
| @Override |
| public void documentAboutToBeChanged(DocumentEvent e) { |
| super.documentAboutToBeChanged(e); |
| if (hasTextBlockSupportedValueChanged()) { |
| clearManagingPositionCategory(); |
| connect(fDocument, false); |
| } |
| } |
| |
| @Override |
| public ITypedRegion[] computePartitioning(int offset, int length, boolean includeZeroLengthPartitions) { |
| if (hasTextBlockSupportedValueChanged()) { |
| clearManagingPositionCategory(); |
| connect(fDocument, false); |
| } |
| return super.computePartitioning(offset, length, includeZeroLengthPartitions); |
| } |
| |
| public void cleanAndReConnectDocumentIfNecessary() { |
| if (hasTextBlockSupportedValueChanged()) { |
| clearManagingPositionCategory(); |
| connect(fDocument, false); |
| } |
| } |
| |
| public boolean hasTextBlockSupportedValueChanged() { |
| boolean textBlockSupportedValueChanged= false; |
| boolean textBlockSupported= isTextBlockSupported(); |
| if (textBlockSupported != fIsTextBlockSupported) { |
| textBlockSupportedValueChanged= true; |
| } |
| return textBlockSupportedValueChanged; |
| } |
| |
| private boolean isTextBlockSupported() { |
| boolean isTextBlockSupported= false; |
| if (fScanner instanceof FastJavaPartitionScanner) { |
| isTextBlockSupported= ((FastJavaPartitionScanner) fScanner).isTextBlockSupported(); |
| } else { |
| isTextBlockSupported= false; |
| } |
| return isTextBlockSupported; |
| } |
| |
| private void clearManagingPositionCategory() { |
| String[] categories= getManagingPositionCategories(); |
| for (String category : categories) { |
| try { |
| fDocument.removePositionCategory(category); |
| } catch (BadPositionCategoryException e) { |
| // do nothing |
| } |
| } |
| clearPositionCache(); |
| } |
| } |