197 lines
6.2 KiB
Python
197 lines
6.2 KiB
Python
![]() |
"""A mypy_ plugin for managing a number of platform-specific annotations.
|
||
|
Its functionality can be split into three distinct parts:
|
||
|
|
||
|
* Assigning the (platform-dependent) precisions of certain `~numpy.number`
|
||
|
subclasses, including the likes of `~numpy.int_`, `~numpy.intp` and
|
||
|
`~numpy.longlong`. See the documentation on
|
||
|
:ref:`scalar types <arrays.scalars.built-in>` for a comprehensive overview
|
||
|
of the affected classes. Without the plugin the precision of all relevant
|
||
|
classes will be inferred as `~typing.Any`.
|
||
|
* Removing all extended-precision `~numpy.number` subclasses that are
|
||
|
unavailable for the platform in question. Most notably this includes the
|
||
|
likes of `~numpy.float128` and `~numpy.complex256`. Without the plugin *all*
|
||
|
extended-precision types will, as far as mypy is concerned, be available
|
||
|
to all platforms.
|
||
|
* Assigning the (platform-dependent) precision of `~numpy.ctypeslib.c_intp`.
|
||
|
Without the plugin the type will default to `ctypes.c_int64`.
|
||
|
|
||
|
.. versionadded:: 1.22
|
||
|
|
||
|
Examples
|
||
|
--------
|
||
|
To enable the plugin, one must add it to their mypy `configuration file`_:
|
||
|
|
||
|
.. code-block:: ini
|
||
|
|
||
|
[mypy]
|
||
|
plugins = numpy.typing.mypy_plugin
|
||
|
|
||
|
.. _mypy: http://mypy-lang.org/
|
||
|
.. _configuration file: https://mypy.readthedocs.io/en/stable/config_file.html
|
||
|
|
||
|
"""
|
||
|
|
||
|
from __future__ import annotations
|
||
|
|
||
|
from collections.abc import Iterable
|
||
|
from typing import Final, TYPE_CHECKING, Callable
|
||
|
|
||
|
import numpy as np
|
||
|
|
||
|
try:
|
||
|
import mypy.types
|
||
|
from mypy.types import Type
|
||
|
from mypy.plugin import Plugin, AnalyzeTypeContext
|
||
|
from mypy.nodes import MypyFile, ImportFrom, Statement
|
||
|
from mypy.build import PRI_MED
|
||
|
|
||
|
_HookFunc = Callable[[AnalyzeTypeContext], Type]
|
||
|
MYPY_EX: None | ModuleNotFoundError = None
|
||
|
except ModuleNotFoundError as ex:
|
||
|
MYPY_EX = ex
|
||
|
|
||
|
__all__: list[str] = []
|
||
|
|
||
|
|
||
|
def _get_precision_dict() -> dict[str, str]:
|
||
|
names = [
|
||
|
("_NBitByte", np.byte),
|
||
|
("_NBitShort", np.short),
|
||
|
("_NBitIntC", np.intc),
|
||
|
("_NBitIntP", np.intp),
|
||
|
("_NBitInt", np.int_),
|
||
|
("_NBitLongLong", np.longlong),
|
||
|
|
||
|
("_NBitHalf", np.half),
|
||
|
("_NBitSingle", np.single),
|
||
|
("_NBitDouble", np.double),
|
||
|
("_NBitLongDouble", np.longdouble),
|
||
|
]
|
||
|
ret = {}
|
||
|
for name, typ in names:
|
||
|
n: int = 8 * typ().dtype.itemsize
|
||
|
ret[f'numpy._typing._nbit.{name}'] = f"numpy._{n}Bit"
|
||
|
return ret
|
||
|
|
||
|
|
||
|
def _get_extended_precision_list() -> list[str]:
|
||
|
extended_names = [
|
||
|
"uint128",
|
||
|
"uint256",
|
||
|
"int128",
|
||
|
"int256",
|
||
|
"float80",
|
||
|
"float96",
|
||
|
"float128",
|
||
|
"float256",
|
||
|
"complex160",
|
||
|
"complex192",
|
||
|
"complex256",
|
||
|
"complex512",
|
||
|
]
|
||
|
return [i for i in extended_names if hasattr(np, i)]
|
||
|
|
||
|
|
||
|
def _get_c_intp_name() -> str:
|
||
|
# Adapted from `np.core._internal._getintp_ctype`
|
||
|
char = np.dtype('p').char
|
||
|
if char == 'i':
|
||
|
return "c_int"
|
||
|
elif char == 'l':
|
||
|
return "c_long"
|
||
|
elif char == 'q':
|
||
|
return "c_longlong"
|
||
|
else:
|
||
|
return "c_long"
|
||
|
|
||
|
|
||
|
#: A dictionary mapping type-aliases in `numpy._typing._nbit` to
|
||
|
#: concrete `numpy.typing.NBitBase` subclasses.
|
||
|
_PRECISION_DICT: Final = _get_precision_dict()
|
||
|
|
||
|
#: A list with the names of all extended precision `np.number` subclasses.
|
||
|
_EXTENDED_PRECISION_LIST: Final = _get_extended_precision_list()
|
||
|
|
||
|
#: The name of the ctypes quivalent of `np.intp`
|
||
|
_C_INTP: Final = _get_c_intp_name()
|
||
|
|
||
|
|
||
|
def _hook(ctx: AnalyzeTypeContext) -> Type:
|
||
|
"""Replace a type-alias with a concrete ``NBitBase`` subclass."""
|
||
|
typ, _, api = ctx
|
||
|
name = typ.name.split(".")[-1]
|
||
|
name_new = _PRECISION_DICT[f"numpy._typing._nbit.{name}"]
|
||
|
return api.named_type(name_new)
|
||
|
|
||
|
|
||
|
if TYPE_CHECKING or MYPY_EX is None:
|
||
|
def _index(iterable: Iterable[Statement], id: str) -> int:
|
||
|
"""Identify the first ``ImportFrom`` instance the specified `id`."""
|
||
|
for i, value in enumerate(iterable):
|
||
|
if getattr(value, "id", None) == id:
|
||
|
return i
|
||
|
raise ValueError("Failed to identify a `ImportFrom` instance "
|
||
|
f"with the following id: {id!r}")
|
||
|
|
||
|
def _override_imports(
|
||
|
file: MypyFile,
|
||
|
module: str,
|
||
|
imports: list[tuple[str, None | str]],
|
||
|
) -> None:
|
||
|
"""Override the first `module`-based import with new `imports`."""
|
||
|
# Construct a new `from module import y` statement
|
||
|
import_obj = ImportFrom(module, 0, names=imports)
|
||
|
import_obj.is_top_level = True
|
||
|
|
||
|
# Replace the first `module`-based import statement with `import_obj`
|
||
|
for lst in [file.defs, file.imports]: # type: list[Statement]
|
||
|
i = _index(lst, module)
|
||
|
lst[i] = import_obj
|
||
|
|
||
|
class _NumpyPlugin(Plugin):
|
||
|
"""A mypy plugin for handling versus numpy-specific typing tasks."""
|
||
|
|
||
|
def get_type_analyze_hook(self, fullname: str) -> None | _HookFunc:
|
||
|
"""Set the precision of platform-specific `numpy.number`
|
||
|
subclasses.
|
||
|
|
||
|
For example: `numpy.int_`, `numpy.longlong` and `numpy.longdouble`.
|
||
|
"""
|
||
|
if fullname in _PRECISION_DICT:
|
||
|
return _hook
|
||
|
return None
|
||
|
|
||
|
def get_additional_deps(
|
||
|
self, file: MypyFile
|
||
|
) -> list[tuple[int, str, int]]:
|
||
|
"""Handle all import-based overrides.
|
||
|
|
||
|
* Import platform-specific extended-precision `numpy.number`
|
||
|
subclasses (*e.g.* `numpy.float96`, `numpy.float128` and
|
||
|
`numpy.complex256`).
|
||
|
* Import the appropriate `ctypes` equivalent to `numpy.intp`.
|
||
|
|
||
|
"""
|
||
|
ret = [(PRI_MED, file.fullname, -1)]
|
||
|
|
||
|
if file.fullname == "numpy":
|
||
|
_override_imports(
|
||
|
file, "numpy._typing._extended_precision",
|
||
|
imports=[(v, v) for v in _EXTENDED_PRECISION_LIST],
|
||
|
)
|
||
|
elif file.fullname == "numpy.ctypeslib":
|
||
|
_override_imports(
|
||
|
file, "ctypes",
|
||
|
imports=[(_C_INTP, "_c_intp")],
|
||
|
)
|
||
|
return ret
|
||
|
|
||
|
def plugin(version: str) -> type[_NumpyPlugin]:
|
||
|
"""An entry-point for mypy."""
|
||
|
return _NumpyPlugin
|
||
|
|
||
|
else:
|
||
|
def plugin(version: str) -> type[_NumpyPlugin]:
|
||
|
"""An entry-point for mypy."""
|
||
|
raise MYPY_EX
|