content: /*
   * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.javac.util;
  
  import java.util.regex.Pattern;
  import jdkx.lang.model.SourceVersion;
  
  /**Utilities to convert an import-like string to a regexp.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class MatchingUtils {
  
      private static final String allMatchesString = ".*";
      private static final Pattern allMatches = Pattern.compile(allMatchesString);
  
      /**
       * Return true if the argument string is a valid import-style
       * string specifying claimed annotations; return false otherwise.
       */
      public static boolean isValidImportString(String s) {
          if (s.equals("*"))
              return true;
  
          boolean valid = true;
          String t = s;
          int index = t.indexOf('*');
  
          if (index != -1) {
              // '*' must be last character...
              if (index == t.length() -1) {
                  // ... any and preceding character must be '.'
                  if ( index-1 >= 0 ) {
                      valid = t.charAt(index-1) == '.';
                      // Strip off ".*$" for identifier checks
                      t = t.substring(0, t.length()-2);
                  }
              } else
                  return false;
          }
  
          // Verify string is off the form (javaId \.)+ or javaId
          if (valid) {
              String[] javaIds = t.split("\\.", t.length()+2);
              for(String javaId: javaIds)
                  valid &= SourceVersion.isIdentifier(javaId);
          }
          return valid;
      }
  
      public static String validImportStringToPatternString(String s) {
          if (s.equals("*")) {
              return allMatchesString;
          } else {
              String s_prime = s.replace(".", "\\.");
  
              if (s_prime.endsWith("*")) {
                  s_prime =  s_prime.substring(0, s_prime.length() - 1) + ".+";
              }
  
              return s_prime;
          }
      }
  
      public static Pattern validImportStringToPattern(String s) {
          String pattern = validImportStringToPatternString(s);
  
          if (pattern == allMatchesString) {
              return allMatches;
          } else {
              return Pattern.compile(pattern);
          }
      }
  
  }
  