typing improvements
This commit is contained in:
protolambda
parent
8919f628cb
commit
d1ecfd510e
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@ -1,52 +1,56 @@
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from types import GeneratorType
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from typing import List, Iterable, TypeVar, Type, NewType
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from typing import Union
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from typing_inspect import get_origin
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class DefaultingTypeMeta(type):
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def default(cls):
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raise Exception("Not implemented")
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# SSZ integers
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# -----------------------------
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class uint(int):
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class uint(int, metaclass=DefaultingTypeMeta):
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byte_len = 0
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def __new__(cls, value, *args, **kwargs):
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if value < 0:
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raise ValueError("unsigned types must not be negative")
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if value.byte_len and value.bit_length() > value.byte_len:
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raise ValueError("value out of bounds for uint{}".format(value.byte_len))
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if cls.byte_len and (value.bit_length() >> 3) > cls.byte_len:
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raise ValueError("value out of bounds for uint{}".format(cls.byte_len))
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return super().__new__(cls, value)
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@classmethod
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def default(cls):
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return cls(0)
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class uint8(uint):
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byte_len = 1
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# Alias for uint8
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byte = NewType('byte', uint8)
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class uint16(uint):
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byte_len = 2
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class uint32(uint):
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byte_len = 4
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class uint64(uint):
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byte_len = 8
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class uint128(uint):
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byte_len = 16
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class uint256(uint):
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byte_len = 32
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def is_uint_type(typ):
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# All integers are uint in the scope of the spec here.
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# Since we default to uint64. Bounds can be checked elsewhere.
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# However, some are wrapped in a NewType
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if hasattr(typ, '__supertype__'):
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# get the type that the NewType is wrapping
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typ = typ.__supertype__
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return isinstance(typ, type) and issubclass(typ, int) and not issubclass(typ, bool)
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# SSZ Container base class
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# -----------------------------
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@ -59,7 +63,7 @@ class Container(object):
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cls = self.__class__
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for f, t in cls.get_fields():
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if f not in kwargs:
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setattr(self, f, get_zero_value(t))
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setattr(self, f, t.default())
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else:
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setattr(self, f, kwargs[f])
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@ -83,9 +87,9 @@ class Container(object):
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return repr({field: getattr(self, field) for field in self.get_field_names()})
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def __str__(self):
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output = []
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output = [f'{self.__class__.__name__}']
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for field in self.get_field_names():
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output.append(f'{field}: {getattr(self, field)}')
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output.append(f' {field}: {getattr(self, field)}')
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return "\n".join(output)
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def __eq__(self, other):
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@ -114,67 +118,94 @@ class Container(object):
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# values of annotations are the types corresponding to the fields, not instance values.
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return list(cls.__annotations__.values())
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@classmethod
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def default(cls):
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return cls(**{f: t.default() for f, t in cls.get_fields()})
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def get_zero_value(typ):
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if typ == int:
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return 0
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elif is_container_type(typ):
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return typ(**{f: get_zero_value(t) for f, t in typ.get_fields()})
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else:
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return typ.default()
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def type_check(typ, value):
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if typ == int or typ == uint64:
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return isinstance(value, int)
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else:
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return typ.value_check(value)
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class ParamsBase:
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_bare = True
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def __new__(cls, *args, **kwargs):
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if cls._bare:
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raise Exception("cannot init bare type without params")
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return super().__new__(cls, **kwargs)
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class ParamsMeta(DefaultingTypeMeta):
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class AbstractListMeta(type):
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def __new__(cls, class_name, parents, attrs):
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out = type.__new__(cls, class_name, parents, attrs)
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if 'elem_type' in attrs and 'length' in attrs:
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setattr(out, 'elem_type', attrs['elem_type'])
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setattr(out, 'length', attrs['length'])
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for k, v in attrs.items():
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setattr(out, k, v)
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return out
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def __getitem__(self, params):
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if not isinstance(params, tuple) or len(params) != 2:
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raise Exception("List must be instantiated with two args: elem type and length")
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o = self.__class__(self.__name__, (self,), {'elem_type': params[0], 'length': params[1]})
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o._name = 'AbstractList'
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o = self.__class__(self.__name__, (self,), self.attr_from_params(params))
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o._bare = False
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return o
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def attr_from_params(self, p):
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# single key params are valid too. Wrap them in a tuple.
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params = p if isinstance(p, tuple) else (p,)
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res = {}
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i = 0
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for (name, typ) in self.__annotations__.items():
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param = params[i]
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if hasattr(self.__class__, name):
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res[name] = getattr(self.__class__, name)
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else:
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if not isinstance(param, typ):
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raise TypeError(
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"cannot create parametrized class with param {} as {} of type {}".format(param, name, typ))
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res[name] = param
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i += 1
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if len(params) != i:
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raise TypeError("provided parameters {} mismatch required parameter count {}".format(params, i))
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return res
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def __instancecheck__(self, obj):
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if obj.__class__.__name__ != self.__name__:
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return False
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if hasattr(self, 'elem_type') and obj.__class__.elem_type != self.elem_type:
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return False
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if hasattr(self, 'length') and obj.__class__.length != self.length:
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for name, typ in self.__annotations__:
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if hasattr(self, name) and hasattr(obj.__class__, name) \
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and getattr(obj.__class__, name) != getattr(self, name):
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return False
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return True
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class ValueCheckError(Exception):
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pass
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class AbstractList(metaclass=AbstractListMeta):
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class AbstractListMeta(ParamsMeta):
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elem_type: DefaultingTypeMeta
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length: int
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class AbstractList(ParamsBase, metaclass=AbstractListMeta):
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def __init__(self, *args):
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items = self.extract_args(args)
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items = self.extract_args(*args)
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if not self.value_check(items):
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raise ValueCheckError("Bad input for class {}: {}".format(self.__class__, items))
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self.items = items
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def value_check(self, value):
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for v in value:
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if not type_check(self.__class__.elem_type, v):
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return False
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return True
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@classmethod
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def value_check(cls, value):
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return all(isinstance(v, cls.elem_type) for v in value)
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def extract_args(self, args):
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return list(args) if len(args) > 0 else self.default()
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@classmethod
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def extract_args(cls, *args):
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x = list(args)
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if len(x) == 1 and isinstance(x[0], GeneratorType):
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x = list(x[0])
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return x if len(x) > 0 else cls.default()
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def default(self):
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raise Exception("Not implemented")
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def __str__(self):
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cls = self.__class__
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return f"{cls.__name__}[{cls.elem_type.__name__}, {cls.length}]({', '.join(str(v) for v in self.items)})"
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def __getitem__(self, i):
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return self.items[i]
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@ -194,137 +225,65 @@ class AbstractList(metaclass=AbstractListMeta):
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def __eq__(self, other):
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return self.items == other.items
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class List(AbstractList, metaclass=AbstractListMeta):
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class List(AbstractList):
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def value_check(self, value):
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return len(value) <= self.__class__.length and super().value_check(value)
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def default(self):
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return []
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@classmethod
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def default(cls):
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return cls()
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class Vector(AbstractList, metaclass=AbstractListMeta):
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def value_check(self, value):
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return len(value) == self.__class__.length and super().value_check(value)
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def default(self):
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return [get_zero_value(self.__class__.elem_type) for _ in range(self.__class__.length)]
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@classmethod
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def default(cls):
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return [cls.elem_type.default() for _ in range(cls.length)]
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class BytesMeta(AbstractListMeta):
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def __getitem__(self, params):
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if not isinstance(params, int):
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raise Exception("Bytes must be instantiated with one arg: length")
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o = self.__class__(self.__name__, (self,), {'length': params})
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o._name = 'Bytes'
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return o
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elem_type: DefaultingTypeMeta = byte
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length: int
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def single_item_extractor(cls, args):
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assert len(args) < 2
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return args[0] if len(args) > 0 else cls.default()
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class Bytes(AbstractList, metaclass=BytesMeta):
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class BytesLike(AbstractList, metaclass=BytesMeta):
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@classmethod
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def extract_args(cls, args):
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if isinstance(args, bytes):
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return args
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elif isinstance(args, BytesLike):
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return args.items
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elif isinstance(args, GeneratorType):
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return bytes(args)
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else:
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return bytes(args)
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@classmethod
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def value_check(cls, value):
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return len(value) == cls.length and isinstance(value, bytes)
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def __str__(self):
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cls = self.__class__
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return f"{cls.__name__}[{cls.length}]: {self.items.hex()}"
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class Bytes(BytesLike):
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def value_check(self, value):
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return len(value) <= self.__class__.length and isinstance(value, bytes)
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extract_args = single_item_extractor
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def default(self):
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@classmethod
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def default(cls):
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return b''
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class BytesN(AbstractList, metaclass=BytesMeta):
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def value_check(self, value):
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return len(value) == self.__class__.length and isinstance(value, bytes)
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extract_args = single_item_extractor
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class BytesN(BytesLike):
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def default(self):
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return b'\x00' * self.__class__.length
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@classmethod
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def default(cls):
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return b'\x00' * cls.length
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# Type helpers
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# -----------------------------
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def infer_type(obj):
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if is_uint_type(obj.__class__):
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return obj.__class__
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elif isinstance(obj, int):
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return uint64
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elif isinstance(obj, (List, Vector, Container, bool, BytesN, Bytes)):
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return obj.__class__
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else:
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raise Exception("Unknown type for {}".format(obj))
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def infer_input_type(fn):
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"""
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Decorator to run infer_type on the obj if typ argument is None
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"""
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def infer_helper(obj, typ=None, **kwargs):
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if typ is None:
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typ = infer_type(obj)
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return fn(obj, typ=typ, **kwargs)
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return infer_helper
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def is_bool_type(typ):
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"""
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Check if the given type is a bool.
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"""
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if hasattr(typ, '__supertype__'):
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typ = typ.__supertype__
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return isinstance(typ, type) and issubclass(typ, bool)
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def is_list_type(typ):
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"""
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Check if the given type is a list.
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"""
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return isinstance(typ, type) and issubclass(typ, List)
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def is_bytes_type(typ):
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"""
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Check if the given type is a ``bytes``.
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"""
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return isinstance(typ, type) and issubclass(typ, Bytes)
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def is_bytesn_type(typ):
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"""
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Check if the given type is a BytesN.
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"""
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return isinstance(typ, type) and issubclass(typ, BytesN)
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def is_list_kind(typ):
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"""
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Check if the given type is a kind of list. Can be bytes.
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"""
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return is_list_type(typ) or is_bytes_type(typ)
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def is_vector_type(typ):
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"""
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Check if the given type is a vector.
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"""
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return isinstance(typ, type) and issubclass(typ, Vector)
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def is_vector_kind(typ):
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"""
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Check if the given type is a kind of vector. Can be BytesN.
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"""
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return is_vector_type(typ) or is_bytesn_type(typ)
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def is_container_type(typ):
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"""
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Check if the given type is a container.
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"""
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return isinstance(typ, type) and issubclass(typ, Container)
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T = TypeVar('T')
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L = TypeVar('L')
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def read_elem_type(typ):
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return typ.elem_type
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