/*******************************************************************************
 * Copyright (c) 2000, 2006 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
 *******************************************************************************/
package org.eclipse.ui.actions;

/**
 * Implements an algorithm for very simple pattern matching in a string. There
 * is only one feature: "*" may be used at the start or the end of the pattern
 * to represent "one or more characters".
 */
public final class SimpleWildcardTester {
	/**
	 * Returns whether a string matches a particular pattern.
	 *
	 * @param pattern the input pattern
	 * @param str     the string to test
	 * @return <code>true</code> if a match occurs; <code>false</code>otherwise.
	 */
	public static boolean testWildcard(String pattern, String str) {
		if (pattern.equals("*")) {//$NON-NLS-1$
			return true;
		} else if (pattern.startsWith("*")) {//$NON-NLS-1$
			if (pattern.endsWith("*")) {//$NON-NLS-1$
				if (pattern.length() == 2) {
					return true;
				}
				return str.contains(pattern.substring(1, pattern.length() - 1));
			}
			return str.endsWith(pattern.substring(1));
		} else if (pattern.endsWith("*")) {//$NON-NLS-1$
			return str.startsWith(pattern.substring(0, pattern.length() - 1));
		} else {
			return str.equals(pattern);
		}
	}

	/**
	 * Returns whether a string matches a particular pattern. Both string and
	 * pattern are converted to lower case before pattern matching occurs.
	 *
	 * @param pattern the input pattern
	 * @param str     the string to test
	 * @return <code>true</code> if a match occurs; <code>false</code>otherwise.
	 */
	public static boolean testWildcardIgnoreCase(String pattern, String str) {

		// If str is null there was no extension to test
		if (str == null) {
			return false;
		}
		pattern = pattern.toLowerCase();
		str = str.toLowerCase();
		return testWildcard(pattern, str);
	}
}
