mirror of https://github.com/morpheus65535/bazarr
290 lines
8.3 KiB
Python
290 lines
8.3 KiB
Python
from __future__ import annotations
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import collections
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from collections.abc import Iterable
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import textwrap
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from typing import Any
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from typing import Callable
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from typing import Dict
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from typing import List
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from typing import Optional
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from typing import overload
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from typing import Sequence
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from typing import Tuple
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from typing import TypeVar
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from typing import Union
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import uuid
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import warnings
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from sqlalchemy.util import asbool # noqa
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from sqlalchemy.util import immutabledict # noqa
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from sqlalchemy.util import memoized_property # noqa
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from sqlalchemy.util import to_list # noqa
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from sqlalchemy.util import unique_list # noqa
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from .compat import inspect_getfullargspec
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_T = TypeVar("_T")
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class _ModuleClsMeta(type):
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def __setattr__(cls, key: str, value: Callable) -> None:
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super().__setattr__(key, value)
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cls._update_module_proxies(key) # type: ignore
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class ModuleClsProxy(metaclass=_ModuleClsMeta):
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"""Create module level proxy functions for the
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methods on a given class.
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The functions will have a compatible signature
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as the methods.
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"""
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_setups: Dict[type, Tuple[set, list]] = collections.defaultdict(
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lambda: (set(), [])
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)
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@classmethod
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def _update_module_proxies(cls, name: str) -> None:
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attr_names, modules = cls._setups[cls]
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for globals_, locals_ in modules:
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cls._add_proxied_attribute(name, globals_, locals_, attr_names)
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def _install_proxy(self) -> None:
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attr_names, modules = self._setups[self.__class__]
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for globals_, locals_ in modules:
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globals_["_proxy"] = self
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for attr_name in attr_names:
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globals_[attr_name] = getattr(self, attr_name)
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def _remove_proxy(self) -> None:
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attr_names, modules = self._setups[self.__class__]
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for globals_, locals_ in modules:
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globals_["_proxy"] = None
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for attr_name in attr_names:
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del globals_[attr_name]
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@classmethod
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def create_module_class_proxy(cls, globals_, locals_):
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attr_names, modules = cls._setups[cls]
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modules.append((globals_, locals_))
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cls._setup_proxy(globals_, locals_, attr_names)
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@classmethod
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def _setup_proxy(cls, globals_, locals_, attr_names):
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for methname in dir(cls):
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cls._add_proxied_attribute(methname, globals_, locals_, attr_names)
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@classmethod
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def _add_proxied_attribute(cls, methname, globals_, locals_, attr_names):
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if not methname.startswith("_"):
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meth = getattr(cls, methname)
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if callable(meth):
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locals_[methname] = cls._create_method_proxy(
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methname, globals_, locals_
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)
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else:
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attr_names.add(methname)
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@classmethod
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def _create_method_proxy(cls, name, globals_, locals_):
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fn = getattr(cls, name)
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def _name_error(name, from_):
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raise NameError(
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"Can't invoke function '%s', as the proxy object has "
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"not yet been "
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"established for the Alembic '%s' class. "
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"Try placing this code inside a callable."
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% (name, cls.__name__)
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) from from_
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globals_["_name_error"] = _name_error
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translations = getattr(fn, "_legacy_translations", [])
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if translations:
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spec = inspect_getfullargspec(fn)
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if spec[0] and spec[0][0] == "self":
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spec[0].pop(0)
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outer_args = inner_args = "*args, **kw"
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translate_str = "args, kw = _translate(%r, %r, %r, args, kw)" % (
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fn.__name__,
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tuple(spec),
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translations,
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)
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def translate(fn_name, spec, translations, args, kw):
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return_kw = {}
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return_args = []
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for oldname, newname in translations:
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if oldname in kw:
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warnings.warn(
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"Argument %r is now named %r "
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"for method %s()." % (oldname, newname, fn_name)
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)
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return_kw[newname] = kw.pop(oldname)
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return_kw.update(kw)
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args = list(args)
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if spec[3]:
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pos_only = spec[0][: -len(spec[3])]
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else:
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pos_only = spec[0]
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for arg in pos_only:
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if arg not in return_kw:
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try:
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return_args.append(args.pop(0))
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except IndexError:
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raise TypeError(
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"missing required positional argument: %s"
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% arg
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)
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return_args.extend(args)
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return return_args, return_kw
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globals_["_translate"] = translate
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else:
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outer_args = "*args, **kw"
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inner_args = "*args, **kw"
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translate_str = ""
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func_text = textwrap.dedent(
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"""\
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def %(name)s(%(args)s):
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%(doc)r
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%(translate)s
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try:
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p = _proxy
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except NameError as ne:
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_name_error('%(name)s', ne)
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return _proxy.%(name)s(%(apply_kw)s)
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e
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"""
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% {
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"name": name,
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"translate": translate_str,
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"args": outer_args,
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"apply_kw": inner_args,
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"doc": fn.__doc__,
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}
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)
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lcl = {}
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exec(func_text, globals_, lcl)
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return lcl[name]
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def _with_legacy_names(translations):
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def decorate(fn):
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fn._legacy_translations = translations
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return fn
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return decorate
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def rev_id() -> str:
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return uuid.uuid4().hex[-12:]
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@overload
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def to_tuple(x: Any, default: tuple) -> tuple:
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...
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@overload
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def to_tuple(x: None, default: Optional[_T] = None) -> _T:
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...
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@overload
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def to_tuple(x: Any, default: Optional[tuple] = None) -> tuple:
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...
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def to_tuple(x, default=None):
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if x is None:
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return default
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elif isinstance(x, str):
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return (x,)
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elif isinstance(x, Iterable):
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return tuple(x)
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else:
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return (x,)
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def dedupe_tuple(tup: Tuple[str, ...]) -> Tuple[str, ...]:
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return tuple(unique_list(tup))
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class Dispatcher:
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def __init__(self, uselist: bool = False) -> None:
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self._registry: Dict[tuple, Any] = {}
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self.uselist = uselist
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def dispatch_for(
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self, target: Any, qualifier: str = "default"
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) -> Callable:
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def decorate(fn):
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if self.uselist:
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self._registry.setdefault((target, qualifier), []).append(fn)
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else:
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assert (target, qualifier) not in self._registry
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self._registry[(target, qualifier)] = fn
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return fn
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return decorate
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def dispatch(self, obj: Any, qualifier: str = "default") -> Any:
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if isinstance(obj, str):
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targets: Sequence = [obj]
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elif isinstance(obj, type):
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targets = obj.__mro__
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else:
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targets = type(obj).__mro__
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for spcls in targets:
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if qualifier != "default" and (spcls, qualifier) in self._registry:
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return self._fn_or_list(self._registry[(spcls, qualifier)])
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elif (spcls, "default") in self._registry:
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return self._fn_or_list(self._registry[(spcls, "default")])
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else:
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raise ValueError("no dispatch function for object: %s" % obj)
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def _fn_or_list(
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self, fn_or_list: Union[List[Callable], Callable]
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) -> Callable:
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if self.uselist:
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def go(*arg, **kw):
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for fn in fn_or_list:
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fn(*arg, **kw)
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return go
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else:
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return fn_or_list # type: ignore
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def branch(self) -> Dispatcher:
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"""Return a copy of this dispatcher that is independently
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writable."""
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d = Dispatcher()
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if self.uselist:
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d._registry.update(
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(k, [fn for fn in self._registry[k]]) for k in self._registry
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)
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else:
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d._registry.update(self._registry)
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return d
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def not_none(value: Optional[_T]) -> _T:
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assert value is not None
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return value
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