| /******************************************************************************* |
| * Copyright (c) 2005, 2007 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| * Bjorn Freeman-Benson - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.debug.examples.ui.pda.editor; |
| |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.Region; |
| |
| /** |
| * Looks for an identifier in a source file |
| */ |
| public class WordFinder { |
| |
| /** |
| * Returns the region in the given document that contains an identifier, or |
| * <code>null</code> if none. |
| * |
| * @param document document to search |
| * @param offset offset at which to look for an identifier |
| * @return region containing an identifier, or <code>null</code> |
| */ |
| public static IRegion findWord(IDocument document, int offset) { |
| |
| int start= -1; |
| int end= -1; |
| |
| |
| try { |
| |
| int pos= offset; |
| char c; |
| |
| while (pos >= 0) { |
| c= document.getChar(pos); |
| if (!Character.isJavaIdentifierPart(c)) |
| break; |
| --pos; |
| } |
| |
| start= pos; |
| |
| pos= offset; |
| int length= document.getLength(); |
| |
| while (pos < length) { |
| c= document.getChar(pos); |
| if (!Character.isJavaIdentifierPart(c)) |
| break; |
| ++pos; |
| } |
| |
| end= pos; |
| |
| } catch (BadLocationException x) { |
| } |
| |
| if (start > -1 && end > -1) { |
| if (start == offset && end == offset) |
| return new Region(offset, 0); |
| else if (start == offset) |
| return new Region(start, end - start); |
| else |
| return new Region(start + 1, end - start - 1); |
| } |
| |
| return null; |
| } |
| } |