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