| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.jface.text.templates; |
| |
| import org.eclipse.jface.text.BadPositionCategoryException; |
| import org.eclipse.jface.text.DocumentEvent; |
| import org.eclipse.jface.text.IPositionUpdater; |
| import org.eclipse.jface.text.Position; |
| |
| /** |
| * Position updater that takes any change in [position.offset, position.offset + position.length] as |
| * belonging to the position. |
| * |
| * @since 3.0 |
| */ |
| class InclusivePositionUpdater implements IPositionUpdater { |
| |
| /** The position category. */ |
| private final String fCategory; |
| |
| /** |
| * Creates a new updater for the given <code>category</code>. |
| * |
| * @param category the new category. |
| */ |
| public InclusivePositionUpdater(String category) { |
| fCategory= category; |
| } |
| |
| @Override |
| public void update(DocumentEvent event) { |
| |
| int eventOffset= event.getOffset(); |
| int eventOldLength= event.getLength(); |
| int eventNewLength= event.getText() == null ? 0 : event.getText().length(); |
| int deltaLength= eventNewLength - eventOldLength; |
| |
| try { |
| Position[] positions= event.getDocument().getPositions(fCategory); |
| |
| for (int i= 0; i != positions.length; i++) { |
| |
| Position position= positions[i]; |
| |
| if (position.isDeleted()) |
| continue; |
| |
| int offset= position.getOffset(); |
| int length= position.getLength(); |
| int end= offset + length; |
| |
| if (offset > eventOffset + eventOldLength) |
| // position comes way |
| // after change - shift |
| position.setOffset(offset + deltaLength); |
| else if (end < eventOffset) { |
| // position comes way before change - |
| // leave alone |
| } else if (offset <= eventOffset && end >= eventOffset + eventOldLength) { |
| // event completely internal to the position - adjust length |
| position.setLength(length + deltaLength); |
| } else if (offset < eventOffset) { |
| // event extends over end of position - adjust length |
| int newEnd= eventOffset + eventNewLength; |
| position.setLength(newEnd - offset); |
| } else if (end > eventOffset + eventOldLength) { |
| // event extends from before position into it - adjust offset |
| // and length |
| // offset becomes end of event, length adjusted accordingly |
| // we want to recycle the overlapping part |
| position.setOffset(eventOffset); |
| int deleted= eventOffset + eventOldLength - offset; |
| position.setLength(length - deleted + eventNewLength); |
| } else { |
| // event consumes the position - delete it |
| position.delete(); |
| } |
| } |
| } catch (BadPositionCategoryException e) { |
| // ignore and return |
| } |
| } |
| |
| /** |
| * Returns the position category. |
| * |
| * @return the position category |
| */ |
| public String getCategory() { |
| return fCategory; |
| } |
| |
| } |