from typing import List
[docs]
class Descriptor(object):
"""
Base Descriptor, <get, set, del> method of each param is unlimited
"""
def __new__(cls, *args, **kwargs):
if cls is Descriptor:
raise TypeError(f"<{cls.__name__} class> may not be instantiated")
return super().__new__(cls)
def __init__(self, name):
self.name = name
def __get__(self, instance, cls):
if instance is None:
return self
elif self.name in instance.__dict__.keys():
return instance.__dict__[self.name]
else:
return cls.__getattr__(instance, self.name)
def __set__(self, instance, value):
instance.__dict__[self.name] = value
def __delete__(self, instance):
del instance.__dict__[self.name]
[docs]
class TypeDescriptor(Descriptor):
"""
Type Descriptor, limit param's type
"""
def __init__(self, name, type):
super(TypeDescriptor, self).__init__(name=name)
self.type = type
def __set__(self, instance, value):
if not isinstance(value, self.type):
raise TypeError(f"{self.name}'s type should be {self.type}")
super().__set__(instance, value)
[docs]
class TypeListDescriptor(Descriptor):
"""
TypeList Descriptor, limit param's type
"""
def __init__(self, name, type):
super(TypeListDescriptor, self).__init__(name=name)
self.type = type
def __set__(self, instance, values: List):
for value in values:
if not isinstance(value, self.type):
raise TypeError(f"{self.name}'s type should be {self.type}")
super().__set__(instance, values)
[docs]
class ValueDescriptor(Descriptor):
"""
Value Descriptor, limit param's value
"""
def __init__(self, name, value):
super(ValueDescriptor, self).__init__(name=name)
self.value = value
def __set__(self, instance, value):
if value not in self.value:
raise ValueError(f"{self.name}'s value should be {self.value}")
super().__set__(instance, value)
[docs]
class IntegerLeftDescriptor(ValueDescriptor):
"""
IntegerLeft Descriptor, limit param's value
"""
def __set__(self, instance, value):
if not isinstance(value, int) or value < self.value:
raise ValueError(f"{self.name}'s value should be integer and >= {self.value}")
instance.__dict__[self.name] = value
[docs]
class IntegerLeftRealRightDescriptor(IntegerLeftDescriptor):
"""
IntegerLeftRealRight Descriptor, limit param's value
"""
def __set__(self, instance, value):
if (isinstance(value, int) and self.value <= value <= 0) or (isinstance(value, float) and value >= 0):
instance.__dict__[self.name] = value
else:
raise ValueError(f"{self.name}'s value should be integer and {self.value} <= value < 0 or "
f"{self.name}'s value should be real and > 0")
[docs]
class TypeValueDescriptor(TypeDescriptor, ValueDescriptor):
def __init__(self, name, value, type):
TypeDescriptor.__init__(self, name=name, type=type)
ValueDescriptor.__init__(self, name=name, value=value)
[docs]
class TypeListValueDescriptor(TypeListDescriptor, ValueDescriptor):
def __init__(self, name, value, type):
TypeListDescriptor.__init__(self, name=name, type=type)
ValueDescriptor.__init__(self, name=name, value=value)