42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
from validate import Validator, validated
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def validate_attributes(cls):
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validators = []
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for name, val in vars(cls).items():
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if isinstance(val, Validator):
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validators.append(val)
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elif callable(val) and val.__annotations__:
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setattr(cls, name, validated(val))
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cls._fields = tuple(val.name for val in validators)
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cls._types = tuple(getattr(v, 'expected_type', lambda x: x) for v in validators)
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if cls._fields:
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cls.create_init()
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return cls
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class Structure:
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_fields = ()
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def __init_subclass__(cls):
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validate_attributes(cls)
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def __repr__(self):
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args = map(lambda field: f"{field}={getattr(self, field)!r}", self._fields)
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return f"{type(self).__name__}({', '.join(args)})"
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def __setattr__(self, name, value):
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if name in self._fields or name[0] == '_':
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super().__setattr__(name, value)
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else:
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raise AttributeError(f"No attribute {name}")
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@classmethod
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def create_init(cls):
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code = f'def __init__(self, {", ".join(cls._fields)}):\n'
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for name in cls._fields:
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code += f' self.{name} = {name}\n'
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locs = {}
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exec(code, locs)
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cls.__init__ = locs['__init__']
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