Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/idna/intranges.py: 23%

1""" 

2Given a list of integers, made up of (hopefully) a small number of long runs 

3of consecutive integers, compute a representation of the form 

4((start1, end1), (start2, end2) ...). Then answer the question "was x present 

5in the original list?" in time O(log(# runs)). 

6""" 

7 

8import bisect 

9from typing import List, Tuple 

10 

11 

12def intranges_from_list(list_: List[int]) -> Tuple[int, ...]: 

13 """Represent a list of integers as a sequence of ranges: 

14 ((start_0, end_0), (start_1, end_1), ...), such that the original 

15 integers are exactly those x such that start_i <= x < end_i for some i. 

16 

17 Ranges are encoded as single integers (start << 32 | end), not as tuples. 

18 """ 

19 

20 sorted_list = sorted(list_) 

21 ranges = [] 

22 last_write = -1 

23 for i in range(len(sorted_list)): 

24 if i + 1 < len(sorted_list) and sorted_list[i] == sorted_list[i + 1] - 1: 

25 continue 

26 current_range = sorted_list[last_write + 1 : i + 1] 

27 ranges.append(_encode_range(current_range[0], current_range[-1] + 1)) 

28 last_write = i 

29 

30 return tuple(ranges) 

31 

32 

33def _encode_range(start: int, end: int) -> int: 

34 return (start << 32) | end 

35 

36 

37def _decode_range(r: int) -> Tuple[int, int]: 

38 return (r >> 32), (r & ((1 << 32) - 1)) 

39 

40 

41def intranges_contain(int_: int, ranges: Tuple[int, ...]) -> bool: 

42 """Determine if `int_` falls into one of the ranges in `ranges`.""" 

43 tuple_ = _encode_range(int_, 0) 

44 pos = bisect.bisect_left(ranges, tuple_) 

45 # we could be immediately ahead of a tuple (start, end) 

46 # with start < int_ <= end 

47 if pos > 0: 

48 left, right = _decode_range(ranges[pos - 1]) 

49 if left <= int_ < right: 

50 return True 

51 # or we could be immediately behind a tuple (int_, end) 

52 if pos < len(ranges): 

53 left, _ = _decode_range(ranges[pos]) 

54 if left == int_: 

55 return True 

56 return False