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|
"""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(self.err())
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(self.ok())
def expect_err(self, msg='Error'):
if not self._is_val:
return self._val
raise ResultException(msg + ': ' + self._val)
def __iter__(self):
if self._is_val:
yield self._val
|
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