456 lines
15 KiB
Python
456 lines
15 KiB
Python
from __future__ import annotations
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import importlib.util
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import itertools
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import os
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import re
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import shutil
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from collections import defaultdict
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from collections.abc import Iterator
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from typing import IO, TYPE_CHECKING
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import pytest
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import numpy as np
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import numpy.typing as npt
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from numpy.typing.mypy_plugin import (
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_PRECISION_DICT,
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_EXTENDED_PRECISION_LIST,
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_C_INTP,
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)
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try:
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from mypy import api
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except ImportError:
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NO_MYPY = True
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else:
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NO_MYPY = False
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if TYPE_CHECKING:
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# We need this as annotation, but it's located in a private namespace.
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# As a compromise, do *not* import it during runtime
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from _pytest.mark.structures import ParameterSet
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DATA_DIR = os.path.join(os.path.dirname(__file__), "data")
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PASS_DIR = os.path.join(DATA_DIR, "pass")
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FAIL_DIR = os.path.join(DATA_DIR, "fail")
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REVEAL_DIR = os.path.join(DATA_DIR, "reveal")
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MISC_DIR = os.path.join(DATA_DIR, "misc")
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MYPY_INI = os.path.join(DATA_DIR, "mypy.ini")
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CACHE_DIR = os.path.join(DATA_DIR, ".mypy_cache")
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#: A dictionary with file names as keys and lists of the mypy stdout as values.
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#: To-be populated by `run_mypy`.
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OUTPUT_MYPY: dict[str, list[str]] = {}
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def _key_func(key: str) -> str:
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"""Split at the first occurrence of the ``:`` character.
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Windows drive-letters (*e.g.* ``C:``) are ignored herein.
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"""
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drive, tail = os.path.splitdrive(key)
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return os.path.join(drive, tail.split(":", 1)[0])
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def _strip_filename(msg: str) -> str:
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"""Strip the filename from a mypy message."""
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_, tail = os.path.splitdrive(msg)
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return tail.split(":", 1)[-1]
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def strip_func(match: re.Match[str]) -> str:
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"""`re.sub` helper function for stripping module names."""
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return match.groups()[1]
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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@pytest.fixture(scope="module", autouse=True)
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def run_mypy() -> None:
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"""Clears the cache and run mypy before running any of the typing tests.
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The mypy results are cached in `OUTPUT_MYPY` for further use.
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The cache refresh can be skipped using
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NUMPY_TYPING_TEST_CLEAR_CACHE=0 pytest numpy/typing/tests
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"""
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if (
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os.path.isdir(CACHE_DIR)
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and bool(os.environ.get("NUMPY_TYPING_TEST_CLEAR_CACHE", True))
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):
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shutil.rmtree(CACHE_DIR)
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for directory in (PASS_DIR, REVEAL_DIR, FAIL_DIR, MISC_DIR):
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# Run mypy
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stdout, stderr, exit_code = api.run([
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"--config-file",
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MYPY_INI,
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"--cache-dir",
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CACHE_DIR,
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directory,
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])
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if stderr:
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pytest.fail(f"Unexpected mypy standard error\n\n{stderr}")
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elif exit_code not in {0, 1}:
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pytest.fail(f"Unexpected mypy exit code: {exit_code}\n\n{stdout}")
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stdout = stdout.replace('*', '')
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# Parse the output
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iterator = itertools.groupby(stdout.split("\n"), key=_key_func)
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OUTPUT_MYPY.update((k, list(v)) for k, v in iterator if k)
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def get_test_cases(directory: str) -> Iterator[ParameterSet]:
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for root, _, files in os.walk(directory):
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for fname in files:
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short_fname, ext = os.path.splitext(fname)
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if ext in (".pyi", ".py"):
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fullpath = os.path.join(root, fname)
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yield pytest.param(fullpath, id=short_fname)
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
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def test_success(path) -> None:
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# Alias `OUTPUT_MYPY` so that it appears in the local namespace
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output_mypy = OUTPUT_MYPY
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if path in output_mypy:
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msg = "Unexpected mypy output\n\n"
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msg += "\n".join(_strip_filename(v) for v in output_mypy[path])
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raise AssertionError(msg)
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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@pytest.mark.parametrize("path", get_test_cases(FAIL_DIR))
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def test_fail(path: str) -> None:
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__tracebackhide__ = True
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with open(path) as fin:
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lines = fin.readlines()
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errors = defaultdict(lambda: "")
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output_mypy = OUTPUT_MYPY
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assert path in output_mypy
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for error_line in output_mypy[path]:
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error_line = _strip_filename(error_line).split("\n", 1)[0]
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match = re.match(
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r"(?P<lineno>\d+): (error|note): .+$",
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error_line,
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)
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if match is None:
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raise ValueError(f"Unexpected error line format: {error_line}")
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lineno = int(match.group('lineno'))
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errors[lineno] += f'{error_line}\n'
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for i, line in enumerate(lines):
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lineno = i + 1
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if (
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line.startswith('#')
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or (" E:" not in line and lineno not in errors)
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):
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continue
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target_line = lines[lineno - 1]
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if "# E:" in target_line:
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expression, _, marker = target_line.partition(" # E: ")
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expected_error = errors[lineno].strip()
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marker = marker.strip()
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_test_fail(path, expression, marker, expected_error, lineno)
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else:
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pytest.fail(
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f"Unexpected mypy output at line {lineno}\n\n{errors[lineno]}"
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)
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_FAIL_MSG1 = """Extra error at line {}
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Expression: {}
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Extra error: {!r}
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"""
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_FAIL_MSG2 = """Error mismatch at line {}
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Expression: {}
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Expected error: {!r}
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Observed error: {!r}
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"""
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def _test_fail(
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path: str,
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expression: str,
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error: str,
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expected_error: None | str,
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lineno: int,
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) -> None:
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if expected_error is None:
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raise AssertionError(_FAIL_MSG1.format(lineno, expression, error))
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elif error not in expected_error:
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raise AssertionError(_FAIL_MSG2.format(
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lineno, expression, expected_error, error
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))
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def _construct_ctypes_dict() -> dict[str, str]:
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dct = {
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"ubyte": "c_ubyte",
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"ushort": "c_ushort",
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"uintc": "c_uint",
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"uint": "c_ulong",
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"ulonglong": "c_ulonglong",
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"byte": "c_byte",
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"short": "c_short",
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"intc": "c_int",
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"int_": "c_long",
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"longlong": "c_longlong",
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"single": "c_float",
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"double": "c_double",
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"longdouble": "c_longdouble",
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}
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# Match `ctypes` names to the first ctypes type with a given kind and
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# precision, e.g. {"c_double": "c_double", "c_longdouble": "c_double"}
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# if both types represent 64-bit floats.
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# In this context "first" is defined by the order of `dct`
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ret = {}
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visited: dict[tuple[str, int], str] = {}
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for np_name, ct_name in dct.items():
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np_scalar = getattr(np, np_name)()
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# Find the first `ctypes` type for a given `kind`/`itemsize` combo
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key = (np_scalar.dtype.kind, np_scalar.dtype.itemsize)
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ret[ct_name] = visited.setdefault(key, f"ctypes.{ct_name}")
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return ret
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def _construct_format_dict() -> dict[str, str]:
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dct = {k.split(".")[-1]: v.replace("numpy", "numpy._typing") for
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k, v in _PRECISION_DICT.items()}
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return {
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"uint8": "numpy.unsignedinteger[numpy._typing._8Bit]",
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"uint16": "numpy.unsignedinteger[numpy._typing._16Bit]",
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"uint32": "numpy.unsignedinteger[numpy._typing._32Bit]",
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"uint64": "numpy.unsignedinteger[numpy._typing._64Bit]",
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"uint128": "numpy.unsignedinteger[numpy._typing._128Bit]",
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"uint256": "numpy.unsignedinteger[numpy._typing._256Bit]",
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"int8": "numpy.signedinteger[numpy._typing._8Bit]",
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"int16": "numpy.signedinteger[numpy._typing._16Bit]",
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"int32": "numpy.signedinteger[numpy._typing._32Bit]",
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"int64": "numpy.signedinteger[numpy._typing._64Bit]",
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"int128": "numpy.signedinteger[numpy._typing._128Bit]",
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"int256": "numpy.signedinteger[numpy._typing._256Bit]",
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"float16": "numpy.floating[numpy._typing._16Bit]",
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"float32": "numpy.floating[numpy._typing._32Bit]",
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"float64": "numpy.floating[numpy._typing._64Bit]",
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"float80": "numpy.floating[numpy._typing._80Bit]",
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"float96": "numpy.floating[numpy._typing._96Bit]",
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"float128": "numpy.floating[numpy._typing._128Bit]",
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"float256": "numpy.floating[numpy._typing._256Bit]",
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"complex64": ("numpy.complexfloating"
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"[numpy._typing._32Bit, numpy._typing._32Bit]"),
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"complex128": ("numpy.complexfloating"
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"[numpy._typing._64Bit, numpy._typing._64Bit]"),
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"complex160": ("numpy.complexfloating"
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"[numpy._typing._80Bit, numpy._typing._80Bit]"),
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"complex192": ("numpy.complexfloating"
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"[numpy._typing._96Bit, numpy._typing._96Bit]"),
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"complex256": ("numpy.complexfloating"
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"[numpy._typing._128Bit, numpy._typing._128Bit]"),
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"complex512": ("numpy.complexfloating"
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"[numpy._typing._256Bit, numpy._typing._256Bit]"),
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"ubyte": f"numpy.unsignedinteger[{dct['_NBitByte']}]",
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"ushort": f"numpy.unsignedinteger[{dct['_NBitShort']}]",
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"uintc": f"numpy.unsignedinteger[{dct['_NBitIntC']}]",
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"uintp": f"numpy.unsignedinteger[{dct['_NBitIntP']}]",
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"uint": f"numpy.unsignedinteger[{dct['_NBitInt']}]",
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"ulonglong": f"numpy.unsignedinteger[{dct['_NBitLongLong']}]",
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"byte": f"numpy.signedinteger[{dct['_NBitByte']}]",
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"short": f"numpy.signedinteger[{dct['_NBitShort']}]",
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"intc": f"numpy.signedinteger[{dct['_NBitIntC']}]",
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"intp": f"numpy.signedinteger[{dct['_NBitIntP']}]",
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"int_": f"numpy.signedinteger[{dct['_NBitInt']}]",
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"longlong": f"numpy.signedinteger[{dct['_NBitLongLong']}]",
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"half": f"numpy.floating[{dct['_NBitHalf']}]",
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"single": f"numpy.floating[{dct['_NBitSingle']}]",
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"double": f"numpy.floating[{dct['_NBitDouble']}]",
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"longdouble": f"numpy.floating[{dct['_NBitLongDouble']}]",
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"csingle": ("numpy.complexfloating"
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f"[{dct['_NBitSingle']}, {dct['_NBitSingle']}]"),
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"cdouble": ("numpy.complexfloating"
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f"[{dct['_NBitDouble']}, {dct['_NBitDouble']}]"),
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"clongdouble": (
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"numpy.complexfloating"
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f"[{dct['_NBitLongDouble']}, {dct['_NBitLongDouble']}]"
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),
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# numpy.typing
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"_NBitInt": dct['_NBitInt'],
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# numpy.ctypeslib
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"c_intp": f"ctypes.{_C_INTP}"
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}
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#: A dictionary with all supported format keys (as keys)
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#: and matching values
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FORMAT_DICT: dict[str, str] = _construct_format_dict()
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FORMAT_DICT.update(_construct_ctypes_dict())
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def _parse_reveals(file: IO[str]) -> tuple[npt.NDArray[np.str_], list[str]]:
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"""Extract and parse all ``" # E: "`` comments from the passed
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file-like object.
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All format keys will be substituted for their respective value
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from `FORMAT_DICT`, *e.g.* ``"{float64}"`` becomes
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``"numpy.floating[numpy._typing._64Bit]"``.
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"""
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string = file.read().replace("*", "")
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# Grab all `# E:`-based comments and matching expressions
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expression_array, _, comments_array = np.char.partition(
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string.split("\n"), sep=" # E: "
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).T
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comments = "/n".join(comments_array)
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# Only search for the `{*}` pattern within comments, otherwise
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# there is the risk of accidentally grabbing dictionaries and sets
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key_set = set(re.findall(r"\{(.*?)\}", comments))
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kwargs = {
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k: FORMAT_DICT.get(k, f"<UNRECOGNIZED FORMAT KEY {k!r}>") for
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k in key_set
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}
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fmt_str = comments.format(**kwargs)
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return expression_array, fmt_str.split("/n")
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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@pytest.mark.parametrize("path", get_test_cases(REVEAL_DIR))
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def test_reveal(path: str) -> None:
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"""Validate that mypy correctly infers the return-types of
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the expressions in `path`.
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"""
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__tracebackhide__ = True
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with open(path) as fin:
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expression_array, reveal_list = _parse_reveals(fin)
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output_mypy = OUTPUT_MYPY
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assert path in output_mypy
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for error_line in output_mypy[path]:
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error_line = _strip_filename(error_line)
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match = re.match(
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r"(?P<lineno>\d+): note: .+$",
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error_line,
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)
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if match is None:
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raise ValueError(f"Unexpected reveal line format: {error_line}")
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lineno = int(match.group('lineno')) - 1
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assert "Revealed type is" in error_line
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marker = reveal_list[lineno]
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expression = expression_array[lineno]
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_test_reveal(path, expression, marker, error_line, 1 + lineno)
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_REVEAL_MSG = """Reveal mismatch at line {}
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Expression: {}
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Expected reveal: {!r}
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Observed reveal: {!r}
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"""
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_STRIP_PATTERN = re.compile(r"(\w+\.)+(\w+)")
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def _test_reveal(
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path: str,
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expression: str,
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reveal: str,
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expected_reveal: str,
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lineno: int,
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) -> None:
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"""Error-reporting helper function for `test_reveal`."""
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stripped_reveal = _STRIP_PATTERN.sub(strip_func, reveal)
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stripped_expected_reveal = _STRIP_PATTERN.sub(strip_func, expected_reveal)
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if stripped_reveal not in stripped_expected_reveal:
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raise AssertionError(
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_REVEAL_MSG.format(lineno,
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expression,
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stripped_expected_reveal,
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stripped_reveal)
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)
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
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def test_code_runs(path: str) -> None:
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"""Validate that the code in `path` properly during runtime."""
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path_without_extension, _ = os.path.splitext(path)
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dirname, filename = path.split(os.sep)[-2:]
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spec = importlib.util.spec_from_file_location(
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f"{dirname}.{filename}", path
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)
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assert spec is not None
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assert spec.loader is not None
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test_module = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(test_module)
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LINENO_MAPPING = {
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3: "uint128",
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4: "uint256",
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6: "int128",
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7: "int256",
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9: "float80",
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10: "float96",
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11: "float128",
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12: "float256",
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14: "complex160",
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15: "complex192",
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16: "complex256",
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17: "complex512",
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}
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@pytest.mark.slow
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@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
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def test_extended_precision() -> None:
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path = os.path.join(MISC_DIR, "extended_precision.pyi")
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output_mypy = OUTPUT_MYPY
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assert path in output_mypy
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with open(path, "r") as f:
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expression_list = f.readlines()
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for _msg in output_mypy[path]:
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*_, _lineno, msg_typ, msg = _msg.split(":")
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msg = _strip_filename(msg)
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lineno = int(_lineno)
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expression = expression_list[lineno - 1].rstrip("\n")
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msg_typ = msg_typ.strip()
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assert msg_typ in {"error", "note"}
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if LINENO_MAPPING[lineno] in _EXTENDED_PRECISION_LIST:
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if msg_typ == "error":
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raise ValueError(f"Unexpected reveal line format: {lineno}")
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else:
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marker = FORMAT_DICT[LINENO_MAPPING[lineno]]
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_test_reveal(path, expression, marker, msg, lineno)
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else:
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if msg_typ == "error":
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marker = "Module has no attribute"
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_test_fail(path, expression, marker, msg, lineno)
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