| /******************************************************************************* |
| * Copyright (c) 2000, 2012 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.debug.ui; |
| |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.Region; |
| |
| import com.ibm.icu.text.UTF16; |
| |
| /** |
| * Contains a static helper method to search documents for the 'word' that encloses the current |
| * selection. |
| */ |
| public class JavaWordFinder { |
| |
| /** |
| * Returns the IRegion containing the java identifier ("word") enclosing the specified offset or |
| * <code>null</code> if the document or offset is invalid. Checks characters before and after the |
| * offset to see if they are allowed java identifier characters until a separator character (period, |
| * space, etc) is found. |
| * |
| * @param document The document to search |
| * @param offset The offset to start looking for the word |
| * @return IRegion containing the word or <code>null</code> |
| */ |
| public static IRegion findWord(IDocument document, int offset) { |
| |
| if (document == null){ |
| return null; |
| } |
| |
| int start= -2; |
| int end= -1; |
| |
| |
| try { |
| |
| int pos= offset; |
| char c; |
| |
| while (pos >= 0) { |
| c= document.getChar(pos); |
| if (!Character.isJavaIdentifierPart(c)) { |
| // Check for surrogates |
| if (UTF16.isSurrogate(c)) { |
| /* |
| * XXX: Here we should create the code point and test whether it is a Java |
| * identifier part. Currently this is not possible because |
| * java.lang.Character in 1.4 does not support surrogates and because |
| * com.ibm.icu.lang.UCharacter.isJavaIdentifierPart(int) is not correctly |
| * implemented. |
| */ |
| } else { |
| 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; |
| } |
| } |