/*******************************************************************************
* Copyright © 2000, 2013 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 org.eclipse.edt.ide.ui.internal.util;
import java.util.regex.Pattern;
public class PatternConstructor {
private static final Pattern PATTERN_BACK_SLASH = Pattern.compile("\\\\"); //$NON-NLS-1$
private static final Pattern PATTERN_QUESTION = Pattern.compile("\\?"); //$NON-NLS-1$
private static final Pattern PATTERN_STAR = Pattern.compile("\\*"); //$NON-NLS-1$
/*
* Converts user string to regular expres '*' and '?' to regEx variables.
*
*/
private static String asRegEx(String pattern) {
// Replace \ with \\, * with .* and ? with .
// Quote remaining characters
String result1 = PATTERN_BACK_SLASH.matcher(pattern).replaceAll(
"\\\\E\\\\\\\\\\\\Q"); //$NON-NLS-1$
String result2 = PATTERN_STAR.matcher(result1).replaceAll(
"\\\\E.*\\\\Q"); //$NON-NLS-1$
String result3 = PATTERN_QUESTION.matcher(result2).replaceAll(
"\\\\E.\\\\Q"); //$NON-NLS-1$
return "\\Q" + result3 + "\\E"; //$NON-NLS-1$ //$NON-NLS-2$
}
/**
* Creates a regular expression pattern from the pattern string (which is
* our old 'StringMatcher' format).
*
* @param pattern
* The search pattern
* @param isCaseSensitive
* Set to <code>true</code> to create a case insensitve pattern
* @return The created pattern
*/
public static Pattern createPattern(String pattern, boolean isCaseSensitive) {
if (isCaseSensitive)
return Pattern.compile(asRegEx(pattern));
return Pattern.compile(asRegEx(pattern), Pattern.CASE_INSENSITIVE
| Pattern.UNICODE_CASE);
}
private PatternConstructor() {
}
}