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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.enterprise.util;

/** Provides some regex utilities.
 * @author Kedar Mhaswade ([email protected])
 * @since GF 3.1
 */
public class RegexUtil {
    /**
     * Convert a shell style glob regular expression to a
     * Java regular expression.
     * Code from: http://stackoverflow.com/questions/1247772
     */
    public static String globToRegex(String line) {
        line = line.trim();
        int strLen = line.length();
        StringBuilder sb = new StringBuilder(strLen);
        boolean escaping = false;
        int inCurlies = 0;
        for (char currentChar : line.toCharArray()) {
            switch (currentChar) {
            case '*':
                if (escaping)
                    sb.append("\\*");
                else
                    sb.append(".*");
                escaping = false;
                break;
            case '?':
                if (escaping)
                    sb.append("\\?");
                else
                    sb.append('.');
                escaping = false;
                break;
            case '.':
            case '(':
            case ')':
            case '+':
            case '|':
            case '^':
            case '$':
            case '@':
            case '%':
                sb.append('\\');
                sb.append(currentChar);
                escaping = false;
                break;
            case '\\':
                if (escaping) {
                    sb.append("\\\\");
                    escaping = false;
                } else
                    escaping = true;
                break;
            case '{':
                if (escaping) {
                    sb.append("\\{");
                } else {
                    sb.append('(');
                    inCurlies++;
                }
                escaping = false;
                break;
            case '}':
                if (inCurlies > 0 && !escaping) {
                    sb.append(')');
                    inCurlies--;
                } else if (escaping)
                    sb.append("\\}");
                else
                    sb.append("}");
                escaping = false;
                break;
            case ',':
                if (inCurlies > 0 && !escaping)
                    sb.append('|');
                else if (escaping)
                    sb.append("\\,");
                else
                    sb.append(",");
                break;
            default:
                escaping = false;
                sb.append(currentChar);
            }
        }
        return sb.toString();
    }
}