Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/dns/grange.py: 11%

1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license 

2 

3# Copyright (C) 2012-2017 Nominum, Inc. 

4# 

5# Permission to use, copy, modify, and distribute this software and its 

6# documentation for any purpose with or without fee is hereby granted, 

7# provided that the above copyright notice and this permission notice 

8# appear in all copies. 

9# 

10# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 

11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 

12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 

13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 

14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 

15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 

16# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 

17 

18"""DNS GENERATE range conversion.""" 

19 

20import dns._text_util 

21import dns.exception 

22 

23 

24def from_text(text: str) -> tuple[int, int, int]: 

25 """Convert the text form of a range in a ``$GENERATE`` statement to an 

26 integer. 

27 

28 :param text: The textual range in ``$GENERATE`` form. 

29 :type text: str 

30 :rtype: tuple[int, int, int] 

31 """ 

32 

33 start = -1 

34 stop = -1 

35 step = 1 

36 cur = "" 

37 state = 0 

38 # state 0 1 2 

39 # x - y / z 

40 

41 if text and text[0] == "-": 

42 raise dns.exception.SyntaxError("Start cannot be a negative number") 

43 

44 for c in text: 

45 if c == "-" and state == 0: 

46 start = int(cur) 

47 cur = "" 

48 state = 1 

49 elif c == "/": 

50 stop = int(cur) 

51 cur = "" 

52 state = 2 

53 elif dns._text_util.is_ascii_digit(c): 

54 cur += c 

55 else: 

56 raise dns.exception.SyntaxError(f"Could not parse {c}") 

57 

58 if state == 0: 

59 raise dns.exception.SyntaxError("no stop value specified") 

60 elif state == 1: 

61 stop = int(cur) 

62 else: 

63 assert state == 2 

64 step = int(cur) 

65 

66 assert step >= 1 

67 assert start >= 0 

68 if start > stop: 

69 raise dns.exception.SyntaxError("start must be <= stop") 

70 

71 return (start, stop, step)