iterator.cpp

ACE自适配通信环境（ADAPTIVE Communication Environment）是可以自由使用、开放源码的面向对象（OO）框架（Framework）

// -*- C++ -*-

// Iterator.cpp,v 4.7 2003/11/01 11:15:22 dhinton Exp

// Copyright (C) 1989 Free Software Foundation, Inc.
// written by Douglas C. Schmidt ([e-mail])

// This file is part of GNU GPERF.

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program 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 for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#include "Iterator.h"

ACE_RCSID(src, Iterator, "Iterator.cpp,v 4.7 2003/11/01 11:15:22 dhinton Exp")

#if defined (ACE_HAS_GPERF)

#include "ace/os_include/os_ctype.h"

// Constructor for Iterator.

Iterator::Iterator (char *s,
                    int lo,
                    int hi,
                    int word_end,
                    int bad_val,
                    int key_end)
  : str (s),
    end (key_end),
    end_word (word_end),
    error_value (bad_val),
    hi_bound (hi),
    lo_bound (lo)
{
}

// Provide an Iterator, returning the ``next'' value from the list of
// valid values given in the constructor.

int
Iterator::operator() (void)
{
  // Variables to record the Iterator's status when handling ranges,
  // e.g., 3-12.

  static int size;
  static int curr_value;
  static int upper_bound;

  if (size)
    {
      if (++curr_value >= upper_bound)
        size = 0;
      return curr_value;
    }
  else
    {
      while (*str)
        switch (*str)
          {
          default: return error_value;
          case ',': str++; break;
          case '$': str++; return end_word;
          case '0': case '1': case '2': case '3': case '4':
          case '5': case '6': case '7': case '8': case '9':
            for (curr_value = 0; isdigit (*str); str++)
              curr_value = curr_value * 10 + *str - '0';

            if (*str == '-')
              {

                for (size = 1, upper_bound = 0;
                     isdigit (*++str);
                     upper_bound = upper_bound * 10 + *str - '0');

                if (upper_bound <= curr_value || upper_bound > hi_bound)
                  return error_value;
              }
            return curr_value >= lo_bound && curr_value <= hi_bound
              ? curr_value : error_value;
          }

      return end;
    }
}

#endif /* ACE_HAS_GPERF */