1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
from __future__ import annotations
import ast
import sys
def main():
for path in sys.argv[1:] or sys.stdin.read().splitlines():
with open(path, 'rb') as path_fd:
lines = path_fd.read().splitlines()
missing = True
if not lines:
# Files are allowed to be empty of everything including boilerplate
missing = False
invalid_future = []
for text in lines:
if text in (
b'from __future__ import annotations',
b'from __future__ import annotations as _annotations',
b'from __future__ import annotations # pragma: nocover',
):
missing = False
break
if text.strip().startswith(b'from __future__ ') or text.strip().startswith(b'__metaclass__ '):
invalid_future.append(text.decode())
if missing:
with open(path) as file:
contents = file.read()
# noinspection PyBroadException
try:
node = ast.parse(contents)
# files consisting of only assignments have no need for future import boilerplate
# the most likely case is that of a documentation only python file
if all(isinstance(statement, ast.Assign) for statement in node.body):
missing = False
except Exception: # pylint: disable=broad-except
pass # the compile sanity test will report this error
if missing:
print('%s: missing: from __future__ import annotations' % path)
for text in invalid_future:
print('%s: invalid: %s' % (path, text))
if __name__ == '__main__':
main()
|
