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__init__.py
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__init__.py
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"""
* Copyright(c) 2021 to 2022 ZettaScale Technology and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
* v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
"""
import dataclasses as _dataclasses
from typing import Any, Tuple, Type, TypeVar, Optional, Dict, Callable, Sequence
from enum import Enum
from .types import ValidUnionHolder
from ._main import IdlMeta, IdlUnionMeta, IdlBitmaskMeta, IdlEnumMeta
from ._support import Buffer, Endianness
_TIS = TypeVar('_TIS', bound='IdlStruct')
_TIU = TypeVar('_TIU', bound='IdlUnion')
_TIB = TypeVar('_TIB', bound='IdlBitmask')
_TIE = TypeVar('_TIE', bound='IdlEnum')
class IdlStruct(metaclass=IdlMeta):
def serialize(self, buffer: Optional[Buffer] = None, endianness: Optional[Endianness] = None, use_version_2: Optional[bool] = None) -> bytes:
return self.__idl__.serialize(self, buffer=buffer, endianness=endianness, use_version_2=use_version_2)
@classmethod
def deserialize(cls: Type[_TIS], data: bytes, has_header: bool = True, use_version_2: Optional[bool] = None) -> _TIS:
return cls.__idl__.deserialize(data, has_header=has_header, use_version_2=use_version_2)
@classmethod
def deserialize_key(cls: Type[_TIS], data: bytes, has_header: bool = True, use_version_2: Optional[bool] = None) -> _TIS:
return cls.__idl__.deserialize_key(data, has_header=has_header, use_version_2=use_version_2)
def make_idl_struct(class_name: str, typename: str, fields: Dict[str, Any], *, dataclassify=True,
field_annotations: Optional[Dict[str, Dict[str, Any]]] = None,
bases: Tuple[Type[IdlStruct], ...] = ()) -> Type[IdlStruct]:
bases = tuple(list(bases) + [IdlStruct])
namespace = IdlMeta.__prepare__(class_name, bases, typename=typename)
for fieldname, _type in fields.items():
namespace['__annotations__'][fieldname] = _type
if field_annotations:
namespace['__idl_field_annotations__'] = field_annotations
cls = IdlMeta(class_name, bases, namespace)
if dataclassify:
cls = _dataclasses.dataclass(cls)
return cls
class IdlUnion(metaclass=IdlUnionMeta):
def __init__(self, **kwargs):
self.__active = None
self.__discriminator = None
self.__value = None
if len(kwargs) == 2 and 'discriminator' in kwargs and 'value' in kwargs:
self.set(kwargs['discriminator'], kwargs['value'])
elif len(kwargs) == 1:
for key, value in kwargs.items():
self.__setattr__(key, value)
else:
raise ValueError("Can only set one field of union.")
def __setattr__(self, name: str, value: Any) -> None:
if name not in self.__idl_names__:
return super().__setattr__(name, value)
if self.__idl_default__ and self.__idl_default__[0] == name:
if self.__active:
super().__setattr__(self.__active, None)
self.__active = name
self.__discriminator = None
self.__value = value
return super().__setattr__(name, value)
for label, case in self.__idl_cases__.items():
if case[0] == name:
if self.__active:
super().__setattr__(self.__active, None)
self.__active = name
self.__discriminator = label
self.__value = value
return super().__setattr__(name, value)
raise Exception("Programmer error, should not get here.")
def __getattr__(self, name: str) -> Any:
if name in self.__idl_names__ and not self.__active == name:
raise AttributeError("Tried to get inactive case on union")
return super().__getattribute__(name)
def set(self, discriminator: int, value: Any) -> None:
if discriminator not in self.__idl_cases__:
if self.__active:
super().__setattr__(self.__active, None)
self.__discriminator = discriminator
self.__value = value
if self.__idl_default__:
self.__active = self.__idl_default__[0]
return super().__setattr__(self.__idl_default__[0], value)
else:
case = self.__idl_cases__[discriminator]
if self.__active:
super().__setattr__(self.__active, None)
self.__active = case[0]
self.__discriminator = discriminator
self.__value = value
return super().__setattr__(case[0], value)
def get(self):
return self.__discriminator, self.__value
@property
def discriminator(self) -> Optional[int]:
return self.__discriminator
@property
def value(self):
return self.__value
def __repr__(self):
return f"{self.__class__.__name__}[Union]{self.get()}"
def __rich_repr__(self):
if self.discriminator is None:
yield "Default selected", None
elif self.value is None:
yield "Default selected", self.discriminator
else:
yield "discriminator", self.discriminator
yield self.__active or "value", self.value
def __str__(self):
return self.__repr__()
def __hash__(self) -> int:
return hash(self.get())
def __eq__(self, other):
if self.__class__ != other.__class__:
return False
if self.discriminator != other.discriminator:
return False
if self.value != other.value:
return False
return True
def serialize(self, buffer: Optional[Buffer] = None, endianness: Optional[Endianness] = None, use_version_2: Optional[bool] = None) -> bytes:
return self.__idl__.serialize(self, buffer=buffer, endianness=endianness, use_version_2=use_version_2)
@classmethod
def deserialize(cls: Type[_TIU], data: bytes, has_header: bool = True, use_version_2: Optional[bool] = None) -> _TIU:
return cls.__idl__.deserialize(data, has_header=has_header, use_version_2=use_version_2)
@classmethod
def deserialize_key(cls: Type[_TIU], data: bytes, has_header: bool = True, use_version_2: Optional[bool] = None) -> _TIU:
return cls.__idl__.deserialize_key(data, has_header=has_header, use_version_2=use_version_2)
def make_idl_union(class_name: str, typename: str, fields: Dict[str, ValidUnionHolder],
discriminator: type, *,
field_annotations: Optional[Dict[str, Dict[str, Any]]] = None,
discriminator_is_key: bool = False) -> Type[IdlUnion]:
namespace = IdlUnionMeta.__prepare__(
class_name, (IdlUnion,),
typename=typename,
discriminator=discriminator,
discriminator_is_key=discriminator_is_key
)
for fieldname, _type in fields.items():
namespace['__annotations__'][fieldname] = _type
if field_annotations:
namespace['__idl_field_annotations__'] = field_annotations
return IdlUnionMeta(class_name, (IdlUnion,), namespace)
class IdlBitmask(metaclass=IdlBitmaskMeta):
@classmethod
def from_mask(cls: Type[_TIB], mask: int) -> _TIB:
values = {}
for fmask, name in cls.__idl_bits__.items():
values[name] = (mask & fmask) > 0
return cls(**values)
def as_mask(self) -> int:
return sum(mask for mask, name in self.__idl_bits__.items() if getattr(self, name))
def __eq__(self, other):
return self.__class__ == other.__class__ and self.as_mask() == other.as_mask()
def make_idl_bitmask(class_name: str, typename: str, fields: Sequence[str], *, dataclassify=True,
field_annotations: Optional[Dict[str, Dict[str, Any]]] = None) -> Type[IdlBitmask]:
namespace = IdlBitmaskMeta.__prepare__(class_name, (IdlBitmask,), typename=typename)
for fieldname in fields:
namespace['__annotations__'][fieldname] = bool
if field_annotations:
namespace['__idl_field_annotations__'] = field_annotations
cls = IdlBitmaskMeta(class_name, (IdlBitmask,), namespace)
if dataclassify:
cls = _dataclasses.dataclass(cls)
return cls
class IdlEnum(Enum, metaclass=IdlEnumMeta):
def _generate_next_value_(name, start, count, last_values):
return last_values[-1] + 1 if last_values else count
def __hash__(self) -> int:
return hash(self.value)
def make_idl_enum(class_name: str, typename: str, fields: Dict[str, int],
default: Optional[str] = None) -> Type[IdlEnum]:
namespace = IdlEnumMeta.__prepare__(class_name, (IdlEnum,), typename=typename)
for fieldname, value in fields.items():
namespace[fieldname] = value
return IdlEnumMeta(class_name, (IdlEnum,), namespace)
__all__ = [
"IdlUnion", "IdlStruct", "IdlBitmask", "IdlEnum",
"make_idl_struct", "make_idl_union", "make_idl_bitmask",
"make_idl_enum"
]