getopt.java

it is a basic java browser

   
      nextchar = "";

      if (pfound.flag != null)
        {
          pfound.flag.setLength(0);
          pfound.flag.append(pfound.val);
   
          return(0);
        }

      return(pfound.val);
   } // if (pfound != null)
  
  longopt_handled = false;

  return(0);
}

/**************************************************************************/

/**
  * This method returns a char that is the current option that has been
  * parsed from the command line.  If the option takes an argument, then
  * the internal variable 'optarg' is set which is a String representing
  * the the value of the argument.  This value can be retrieved by the
  * caller using the getOptarg() method.  If an invalid option is found,
  * an error message is printed and a '?' is returned.  The name of the
  * invalid option character can be retrieved by calling the getOptopt()
  * method.  When there are no more options to be scanned, this method
  * returns -1.  The index of first non-option element in argv can be
  * retrieved with the getOptind() method.
  *
  * @return Various things as described above
  */
public int
getopt()
{
  optarg = null;

  if ((nextchar == null) || (nextchar.equals("")))
    {
      // If we have just processed some options following some non-options,
      //  exchange them so that the options come first.
      if (last_nonopt > optind)
        last_nonopt = optind;
      if (first_nonopt > optind)
        first_nonopt = optind;

      if (ordering == PERMUTE)
        {
          // If we have just processed some options following some non-options,
          // exchange them so that the options come first.
          if ((first_nonopt != last_nonopt) && (last_nonopt != optind))
            exchange(argv);
          else if (last_nonopt != optind)
            first_nonopt = optind;

          // Skip any additional non-options
          // and extend the range of non-options previously skipped.
          while ((optind < argv.length) && (argv[optind].equals("") ||
            (argv[optind].charAt(0) != '-') || argv[optind].equals("-")))
            {
              optind++;
            }
          
          last_nonopt = optind;
        }

      // The special ARGV-element `--' means premature end of options.
      // Skip it like a null option,
      // then exchange with previous non-options as if it were an option,
      // then skip everything else like a non-option.
      if ((optind != argv.length) && argv[optind].equals("--"))
        {
          optind++;

          if ((first_nonopt != last_nonopt) && (last_nonopt != optind))
            exchange (argv);
          else if (first_nonopt == last_nonopt)
            first_nonopt = optind;

          last_nonopt = argv.length;

          optind = argv.length;
        }

      // If we have done all the ARGV-elements, stop the scan
      // and back over any non-options that we skipped and permuted.
      if (optind == argv.length)
        {
          // Set the next-arg-index to point at the non-options
          // that we previously skipped, so the caller will digest them.
          if (first_nonopt != last_nonopt)
            optind = first_nonopt;

          return(-1);
        }

      // If we have come to a non-option and did not permute it,
      // either stop the scan or describe it to the caller and pass it by.
      if (argv[optind].equals("") || (argv[optind].charAt(0) != '-') || 
          argv[optind].equals("-"))
        {
          if (ordering == REQUIRE_ORDER)
            return(-1);

            optarg = argv[optind++];
            return(1);
        }
      
      // We have found another option-ARGV-element.
      // Skip the initial punctuation.
      if (argv[optind].startsWith("--"))
        nextchar = argv[optind].substring(2);
      else
        nextchar = argv[optind].substring(1);
   }

  // Decode the current option-ARGV-element.

  /* Check whether the ARGV-element is a long option.

     If long_only and the ARGV-element has the form "-f", where f is
     a valid short option, don't consider it an abbreviated form of
     a long option that starts with f.  Otherwise there would be no
     way to give the -f short option.

     On the other hand, if there's a long option "fubar" and
     the ARGV-element is "-fu", do consider that an abbreviation of
     the long option, just like "--fu", and not "-f" with arg "u".

     This distinction seems to be the most useful approach.  */
  if ((long_options != null) && (argv[optind].startsWith("--")
      || (long_only && ((argv[optind].length()  > 2) || 
      (optstring.indexOf(argv[optind].charAt(1)) == -1)))))
    {
       int c = checkLongOption();

       if (longopt_handled)
         return(c);
         
      // Can't find it as a long option.  If this is not getopt_long_only,
      // or the option starts with '--' or is not a valid short
      // option, then it's an error.
      // Otherwise interpret it as a short option.
      if (!long_only || argv[optind].startsWith("--")
        || (optstring.indexOf(nextchar.charAt(0)) == -1))
        {
          if (opterr)
            {
              if (argv[optind].startsWith("--"))
                {
                  Object[] msgArgs = { progname, nextchar };
                  System.err.println(MessageFormat.format(
                                   _messages.getString("getopt.unrecognized"), 
                                   msgArgs));
                }
              else
                {
                  Object[] msgArgs = { progname, new 
                                 Character(argv[optind].charAt(0)).toString(), 
                                 nextchar };
                  System.err.println(MessageFormat.format(
                                 _messages.getString("getopt.unrecognized2"), 
                                 msgArgs));
                }
            }

          nextchar = "";
          ++optind;
          optopt = 0;
    
          return('?');
        }
    } // if (longopts)

  // Look at and handle the next short option-character */
  int c = nextchar.charAt(0); //**** Do we need to check for empty str?
  if (nextchar.length() > 1)
    nextchar = nextchar.substring(1);
  else
    nextchar = "";
  
  String temp = null;
  if (optstring.indexOf(c) != -1)
    temp = optstring.substring(optstring.indexOf(c));

  if (nextchar.equals(""))
    ++optind;

  if ((temp == null) || (c == ':'))
    {
      if (opterr)
        {
          if (posixly_correct)
            {
              // 1003.2 specifies the format of this message
              Object[] msgArgs = { progname, new 
                                   Character((char)c).toString() };
              System.err.println(MessageFormat.format(
                            _messages.getString("getopt.illegal"), msgArgs));
            }
          else
            {
              Object[] msgArgs = { progname, new 
                                   Character((char)c).toString() };
              System.err.println(MessageFormat.format(
                            _messages.getString("getopt.invalid"), msgArgs));
            }
        }

      optopt = c;

      return('?');
    }

  // Convenience. Treat POSIX -W foo same as long option --foo
  if ((temp.charAt(0) == 'W') && (temp.length() > 1) && (temp.charAt(1) == ';'))
    {
      if (!nextchar.equals(""))
        {
          optarg = nextchar;
        }
      // No further cars in this argv element and no more argv elements
      else if (optind == argv.length)
        {
          if (opterr)
            {
              // 1003.2 specifies the format of this message. 
              Object[] msgArgs = { progname, new 
                                   Character((char)c).toString() };
              System.err.println(MessageFormat.format(
                            _messages.getString("getopt.requires2"), msgArgs));
            }

          optopt = c;
          if (optstring.charAt(0) == ':')
            return(':');
          else
            return('?');
        }
      else
        {
          // We already incremented `optind' once;
          // increment it again when taking next ARGV-elt as argument. 
          nextchar = argv[optind];
          optarg  = argv[optind];
        }

      c = checkLongOption();

      if (longopt_handled)
        return(c);
      else
        // Let the application handle it
        {
          nextchar = null;
          ++optind;
          return('W');
        }
    }

  if ((temp.length() > 1) && (temp.charAt(1) == ':'))
    {
      if ((temp.length() > 2) && (temp.charAt(2) == ':'))
        // This is an option that accepts and argument optionally
        {
          if (!nextchar.equals(""))
            {
               optarg = nextchar;
               ++optind;
            }
          else
            {
              optarg = null;
            }

          nextchar = null;
        }
      else
        {
          if (!nextchar.equals(""))
            {
              optarg = nextchar;
              ++optind;
            }
          else if (optind == argv.length)
            {
              if (opterr)
                {
                  // 1003.2 specifies the format of this message
                  Object[] msgArgs = { progname, new 
                                       Character((char)c).toString() };
                  System.err.println(MessageFormat.format(
                            _messages.getString("getopt.requires2"), msgArgs));
                }

              optopt = c;
 
              if (optstring.charAt(0) == ':')
                return(':');
              else
                return('?');
            }
          else
            {
              optarg = argv[optind];
              ++optind;
            }

          nextchar = null;
        }
    }

  return(c);
}

} // Class Getopt