blob: d6933d899a4039822e28f6016632616da62fc01c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
"""Result type module"""
class ResultException(Exception):
pass
class Result():
"""Result = Err E | Ok V"""
def __init__(self, is_val):
self._is_val = is_val
@classmethod
def Ok(cls, val=None):
res = cls(True)
res._val = val
return res
@classmethod
def Err(cls, val=None):
res = cls(False)
res._val = val
return res
def is_ok(self):
return self._is_val
def is_err(self):
return not self._is_val
def ok(self):
return self._val if self._is_val else None
def err(self):
return self._val if not self._is_val else None
def map(self, f):
return Result.Ok(f(self.ok())) if self._is_val else Result.Err(self.err())
def map_err(self, f):
return Result.Err(f(self.err())) if not self._is_val else Result.Ok(self.ok())
def unwrap(self):
return self.expect()
def expect(self, msg='Error'):
if self._is_val:
return self._val
raise ResultException(msg + ': ' + self._val)
def unwrap_err(self):
return self.expect_err()
def expect_err(self, msg='Error'):
if not self._is_val:
return self._val
raise ResultException(msg + ': ' + self._val)
def and_(self, rhs):
if not self.is_ok():
return Result.Err(self.err())
return rhs
def and_then(self, f):
return self.map(f)
def or_(self, rhs):
if self.is_ok():
return Result.Ok(self.ok())
return rhs
def __iter__(self):
if self._is_val:
yield self._val
|
GitWeb
