| /******************************************************************************* |
| * Copyright (c) 2008 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 |
| * Bredex GmbH - Creator of this class. |
| ******************************************************************************/ |
| |
| package org.eclipse.ui.internal.activities; |
| |
| /** |
| * Utility helper class for regular expression string patterns. |
| * |
| * @since 3.4 |
| * @author Jan Diederich |
| */ |
| public class PatternUtil { |
| |
| /** |
| * Quotes a string pattern as non-regular expression string. |
| * That means: no regular expresion instructions in the given string |
| * won't be taken into account.<br/> |
| * Example: |
| * <code>String searchString = "xy[^a]";<br/> |
| * Pattern.compile(quotePattern(searchString)).matcher(searchString) |
| * .matches(); |
| * <br/> </code> will return true. |
| * @param pattern pattern to quote |
| * @return the quoted pattern |
| */ |
| public static String quotePattern(String pattern) { |
| final String START = "\\Q"; //$NON-NLS-1$ |
| final String STOP = "\\E"; //$NON-NLS-1$ |
| final int STOP_LENGTH = 2; // STOP.length() |
| |
| int stopIndex = pattern.indexOf(STOP); |
| if (stopIndex < 0) { |
| return START + pattern + STOP; |
| } |
| |
| String result = START; |
| for (int position=0; ;) { |
| stopIndex = pattern.indexOf(STOP, position); |
| if (stopIndex >= 0) { |
| result += pattern.substring(position, stopIndex + 2) |
| + "\\" + STOP + START; //$NON-NLS-1$ |
| position = stopIndex + STOP_LENGTH; |
| } else { |
| result += pattern.substring(position) + STOP; |
| break; |
| } |
| } |
| |
| return result; |
| } |
| } |