90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
# piker: trading gear for hackers
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# Copyright (C) Guillermo Rodriguez (in stewardship for piker0)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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Built-in (extension) types.
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"""
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import sys
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from pprint import pformat
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import msgspec
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class Struct(
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msgspec.Struct,
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# https://jcristharif.com/msgspec/structs.html#tagged-unions
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# tag='pikerstruct',
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# tag=True,
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):
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'''
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A "human friendlier" (aka repl buddy) struct subtype.
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'''
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def to_dict(self) -> dict:
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return {
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f: getattr(self, f)
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for f in self.__struct_fields__
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}
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# Lul, doesn't seem to work that well..
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# def __repr__(self):
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# # only turn on pprint when we detect a python REPL
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# # at runtime B)
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# if (
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# hasattr(sys, 'ps1')
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# # TODO: check if we're in pdb
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# ):
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# return self.pformat()
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# return super().__repr__()
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def pformat(self) -> str:
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return f'Struct({pformat(self.to_dict())})'
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def copy(
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self,
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update: dict | None = None,
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) -> msgspec.Struct:
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'''
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Validate-typecast all self defined fields, return a copy of us
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with all such fields.
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This is kinda like the default behaviour in `pydantic.BaseModel`.
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'''
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if update:
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for k, v in update.items():
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setattr(self, k, v)
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# roundtrip serialize to validate
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return msgspec.msgpack.Decoder(
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type=type(self)
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).decode(
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msgspec.msgpack.Encoder().encode(self)
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)
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# NOTE XXX: this won't work on frozen types!
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# use ``.copy()`` above in such cases.
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def typecast(
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self,
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# fields: list[str] | None = None,
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) -> None:
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for fname, ftype in self.__annotations__.items():
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setattr(self, fname, ftype(getattr(self, fname)))
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