| /******************************************************************************* |
| * Copyright (c) 2008, 2015 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 |
| * 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 expression instructions in the given string won't be taken into |
| * account.<br> |
| * Example: |
| * <pre> |
| * String searchString = "xy[^a]"; |
| * Pattern.compile(quotePattern(searchString)).matcher(searchString) |
| * .matches(); |
| * </pre> |
| * will return <code>true</code>. |
| * |
| * @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() |
| |
| StringBuilder result = new StringBuilder(START); |
| int stopIndex = pattern.indexOf(STOP); |
| if (stopIndex < 0) { |
| return result.append(pattern).append(STOP).toString(); |
| } |
| |
| for (int position = 0;;) { |
| stopIndex = pattern.indexOf(STOP, position); |
| if (stopIndex >= 0) { |
| result.append(pattern.substring(position, stopIndex + 2)).append("\\").append(STOP).append(START); //$NON-NLS-1$ |
| position = stopIndex + STOP_LENGTH; |
| } else { |
| result.append(pattern.substring(position)).append(STOP); |
| break; |
| } |
| } |
| |
| return result.toString(); |
| } |
| } |