/*******************************************************************************
* Copyright (c) 2008, 2015 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;
}
}