WordFinder.java

/*=============================================================================#
 # Copyright (c) 2000-2016 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
 #=============================================================================*/

package de.walware.ecommons.templates;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;


public class WordFinder {
	
	
	public static IRegion findWord(final IDocument document, final int offset) {
		int start = -1;
		int end = -1;
		
		try {
			int pos = offset;
			char c;
			while (pos >= 0) {
				c = document.getChar(pos);
				if (!(Character.isLetterOrDigit(c) || c == '_')) {
					break;
				}
				--pos;
			}
			start = pos;
			
			pos = offset;
			final int length = document.getLength();
			while (pos < length) {
				c = document.getChar(pos);
				if (!(Character.isLetterOrDigit(c) || c == '_')) {
					break;
				}
				++pos;
			}
			end = pos;
		} 
		catch (final 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;
	}
	
}