Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pyrsistent/_helpers.py: 20%

1from functools import wraps 

2from pyrsistent._pmap import PMap, pmap 

3from pyrsistent._pset import PSet, pset 

4from pyrsistent._pvector import PVector, pvector 

5 

6def freeze(o, strict=True): 

7 """ 

8 Recursively convert simple Python containers into pyrsistent versions 

9 of those containers. 

10 

11 - list is converted to pvector, recursively 

12 - dict is converted to pmap, recursively on values (but not keys) 

13 - set is converted to pset, but not recursively 

14 - tuple is converted to tuple, recursively. 

15 

16 If strict == True (default): 

17 

18 - freeze is called on elements of pvectors 

19 - freeze is called on values of pmaps 

20 

21 Sets and dict keys are not recursively frozen because they do not contain 

22 mutable data by convention. The main exception to this rule is that 

23 dict keys and set elements are often instances of mutable objects that 

24 support hash-by-id, which this function can't convert anyway. 

25 

26 >>> freeze(set([1, 2])) 

27 pset([1, 2]) 

28 >>> freeze([1, {'a': 3}]) 

29 pvector([1, pmap({'a': 3})]) 

30 >>> freeze((1, [])) 

31 (1, pvector([])) 

32 """ 

33 typ = type(o) 

34 if typ is dict or (strict and isinstance(o, PMap)): 

35 return pmap({k: freeze(v, strict) for k, v in o.items()}) 

36 if typ is list or (strict and isinstance(o, PVector)): 

37 curried_freeze = lambda x: freeze(x, strict) 

38 return pvector(map(curried_freeze, o)) 

39 if typ is tuple: 

40 curried_freeze = lambda x: freeze(x, strict) 

41 return tuple(map(curried_freeze, o)) 

42 if typ is set: 

43 # impossible to have anything that needs freezing inside a set or pset 

44 return pset(o) 

45 return o 

46 

47 

48def thaw(o, strict=True): 

49 """ 

50 Recursively convert pyrsistent containers into simple Python containers. 

51 

52 - pvector is converted to list, recursively 

53 - pmap is converted to dict, recursively on values (but not keys) 

54 - pset is converted to set, but not recursively 

55 - tuple is converted to tuple, recursively. 

56 

57 If strict == True (the default): 

58 

59 - thaw is called on elements of lists 

60 - thaw is called on values in dicts 

61 

62 >>> from pyrsistent import s, m, v 

63 >>> thaw(s(1, 2)) 

64 {1, 2} 

65 >>> thaw(v(1, m(a=3))) 

66 [1, {'a': 3}] 

67 >>> thaw((1, v())) 

68 (1, []) 

69 """ 

70 typ = type(o) 

71 if isinstance(o, PVector) or (strict and typ is list): 

72 curried_thaw = lambda x: thaw(x, strict) 

73 return list(map(curried_thaw, o)) 

74 if isinstance(o, PMap) or (strict and typ is dict): 

75 return {k: thaw(v, strict) for k, v in o.items()} 

76 if typ is tuple: 

77 curried_thaw = lambda x: thaw(x, strict) 

78 return tuple(map(curried_thaw, o)) 

79 if isinstance(o, PSet): 

80 # impossible to thaw inside psets or sets 

81 return set(o) 

82 return o 

83 

84 

85def mutant(fn): 

86 """ 

87 Convenience decorator to isolate mutation to within the decorated function (with respect 

88 to the input arguments). 

89 

90 All arguments to the decorated function will be frozen so that they are guaranteed not to change. 

91 The return value is also frozen. 

92 """ 

93 @wraps(fn) 

94 def inner_f(*args, **kwargs): 

95 return freeze(fn(*[freeze(e) for e in args], **dict(freeze(item) for item in kwargs.items()))) 

96 

97 return inner_f