1 /*
   2  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   3  * this software and associated documentation files (the "Software"), to deal in
   4  * the Software without restriction, including without limitation the rights to
   5  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   6  * of the Software, and to permit persons to whom the Software is furnished to do
   7  * so, subject to the following conditions:
   8  *
   9  * The above copyright notice and this permission notice shall be included in all
  10  * copies or substantial portions of the Software.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  15  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  16  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  17  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  18  * SOFTWARE.
  19  */
  20 package jdk.nashorn.internal.runtime.regexp.joni;
  21 
  22 final class BitStatus {
  23     public static final int BIT_STATUS_BITS_NUM = 4 * 8;
  24 
  25     public static int bsClear() {
  26         return 0;
  27     }
  28 
  29     public static int bsAll() {
  30         return -1;
  31     }
  32 
  33     public static boolean bsAt(final int stats, final int n) {
  34         return (n < BIT_STATUS_BITS_NUM ? stats & (1 << n) : (stats & 1)) != 0;
  35     }
  36 
  37     public static int bsOnAt(final int statsp, final int n) {
  38         int stats = statsp;
  39         if (n < BIT_STATUS_BITS_NUM) {
  40             stats |= (1 << n);
  41         } else {
  42             stats |= 1;
  43         }
  44         return stats;
  45     }
  46 
  47     public static int bsOnOff(final int v, final int f, final boolean negative) {
  48         return negative ? (v & ~f) : (v | f);
  49     }
  50 }