| 9 | ################################################################################ |
| 10 | |
| 11 | class COD: |
| 12 | |
| 13 | def __init__(self, code): |
| 14 | for ins in code: |
| 15 | assert 0 <= ins < len(INS) |
| 16 | self.cod = code |
| 17 | self.pos = 0 |
| 18 | |
| 19 | def get(self): |
| 20 | return self.cod[self.pos] |
| 21 | |
| 22 | def inc(self): |
| 23 | self.pos += 1 |
| 24 | if self.pos == len(self.cod): |
| 25 | raise SystemExit |
| 26 | |
| 27 | def dec(self): |
| 28 | self.pos -= 1 |
| 29 | assert self.pos >= 0 |
| 30 | |
| 31 | ################################################################################ |
| 32 |