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deserial.py
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executable file
·263 lines (193 loc) · 6.41 KB
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#!/usr/bin/env python3
from __future__ import annotations
from dataclasses import dataclass
from functools import cached_property, partial
from os import PathLike
from pathlib import Path
from typing import (Callable, Dict, Generic, Iterable, Iterator, List, Mapping,
Optional, Tuple, Type, TypeVar, Union, overload)
import yaml
K = TypeVar('K')
T = TypeVar('T')
U = TypeVar('U')
class HydrationError(Exception):
def __init__(self, msg: str, loc: Loc) -> None:
super().__init__(msg)
self.loc = loc
def __str__(self) -> str:
return f'{self.loc}: {super().__str__()}'
@dataclass(frozen=True)
class Loc:
file: Path
path: Tuple[object, ...]
def __str__(self) -> str:
path = '.'.join(map(str, self.path))
return f'{self.file}:.{path}'
def __truediv__(self, seg: object) -> Loc:
return Loc(self.file, (*self.path, seg))
@dataclass
class MissingType:
pass
Missing = MissingType()
@dataclass(frozen=True)
class Raw:
data: object
loc: Loc
@property
def missing(self) -> bool:
return self.data is Missing
def _as(self, cls: Type[T], opt: bool = False) -> T:
if not isinstance(self.data, cls):
if opt:
return cls()
exp = cls.__name__
found = 'nothing' if self.missing else type(self.data).__name__
raise HydrationError(f'expected {exp}, found {found}', self.loc)
return self.data
def __bool__(self) -> bool:
return self._as(bool)
def __str__(self) -> str:
return self._as(str)
def __int__(self) -> int:
return self._as(int)
def __float__(self) -> float:
return self._as(float)
def list(self) -> Iterable[Raw]:
data: List[object] = self._as(list, opt=True)
return (Raw(v, self.loc / i) for i, v in enumerate(data))
def dict(self) -> Iterable[Tuple[Raw, Raw]]:
data: Dict[object, object] = self._as(dict, opt=True)
return (
(Raw(k, self.loc / k / '<key>'), Raw(v, self.loc / k))
for k, v in data.items()
)
class RawDict(Dict[K, Raw]):
def __init__(self, raw: Raw, mk_key: Maker[K]) -> None:
super().__init__((mk_key(k), v) for k, v in raw.dict())
self.loc = raw.loc
def __getitem__(self, key: K) -> Raw:
if key not in self:
return Raw(Missing, self.loc / key)
return super().__getitem__(key)
class Hydrated:
_loc: Loc
def __class_getitem__(cls, args):
return partial(cls, args=args)
class Opt(Hydrated, Generic[T]):
def __init__(self, raw: Raw, *, args: Maker[T] = None) -> None:
assert args is not None
self.mk = args
self.raw = raw
self._loc = raw.loc
def __bool__(self) -> bool:
return not self.raw.missing
@cached_property
def value(self) -> T:
return self.mk(self.raw)
class Arr(Hydrated, List[T]):
def __init__(self, raw: Raw, *, args: Maker[T] = None) -> None:
assert args is not None
super().__init__(args(a) for a in raw.list())
self._loc = raw.loc
class Map(Hydrated, Dict[K, T]):
def __init__(
self,
raw: Raw,
*,
args: Tuple[Maker[K], Maker[T]] = None,
) -> None:
assert args is not None
mk_key, mk_val = args
super().__init__((mk_key(k), mk_val(v)) for k, v in raw.dict())
self._loc = raw.loc
class LazyMap(Hydrated, Mapping[K, T]):
def __init__(
self,
raw: Raw,
*,
args: Tuple[Maker[K], Maker[T]] = None,
) -> None:
assert args is not None
mk_key, mk_val = args
self.src = RawDict(raw, mk_key)
self.f = mk_val
self.cache: Dict[K, T] = {}
def __getitem__(self, key: K) -> T:
if key not in self.cache:
self.cache[key] = self.f(self.src[key])
return self.cache[key]
def __iter__(self) -> Iterator[K]:
return iter(self.src)
def __len__(self) -> int:
return len(self.src)
def __contains__(self, key: object) -> bool:
return key in self.src
@dataclass
class CatMap(Mapping[K, T]):
a: Mapping[K, T]
b: Mapping[K, T]
def __getitem__(self, key: K) -> T:
return self.a[key] if key in self.a else self.b[key]
def __iter__(self) -> Iterator[K]:
return iter(self.a.keys() | self.b.keys())
def __len__(self) -> int:
return len(self.a.keys() | self.b.keys())
class Struct:
def __init__(self, raw: Raw) -> None:
self._raw = RawDict(raw, str)
self._init()
def __repr__(self) -> str:
cls = type(self)
return f'<{cls.__module__}.{cls.__name__} struct at {self._raw.loc}>'
def _init(self) -> None:
pass
class LazyField(Generic[T]):
def __init__(self, mk: Maker[T], key: str = None) -> None:
self.mk = mk
self.key = key
def __set_name__(self, owner: Type[Struct], name: str) -> None:
if self.key is None:
self.key = name
self.name = name
@overload
def __get__(self, obj: None, cls: Type[Struct]) -> LazyField[T]: ...
@overload
def __get__(self, obj: Struct, cls: Type[Struct]) -> T: ...
def __get__(
self,
obj: Optional[Struct],
cls: Type[Struct] = None,
) -> Union[LazyField[T], T]:
if obj is None:
return self
assert self.key is not None
val = self.mk(obj._raw[self.key])
setattr(obj, self.name, val)
return val
Maker = Callable[[Raw], T]
def load_yaml(mk: Maker[T], path: Union[str, PathLike[str]]) -> T:
p = Path(path)
with open(p) as f:
data: object = yaml.safe_load(f)
loc = Loc(p, ())
return mk(Raw(data, loc))
class Executable(Struct):
dependencies = LazyField(Arr[str])
def _init(self) -> None:
self.main = str(self._raw['main'])
class Package(Struct):
name = LazyField(str)
dependencies = LazyField(Arr[str])
ghc_options = LazyField(str, key='ghc-options')
executables = LazyField(LazyMap[str, Executable])
pkg = load_yaml(Package, Path(__file__).parent / 'package.yaml')
print(f'{pkg=}')
print(f'{pkg.name=}')
print(f'{pkg.dependencies=}')
print(f'{pkg.ghc_options=}')
print(f'{pkg.executables["Action"].main=}')
print(f'{pkg.executables["Generator"].dependencies=}')
try:
print(f'{pkg.executables["oops"]=}')
except HydrationError as e:
print(e)