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qapi: add must_match helper

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Mypy cannot generally understand that these regex functions cannot
possibly fail. Add a "must_match" helper that makes this clear for
mypy.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-10-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
John Snow
2021-05-19 14:39:45 -04:00
committed by Markus Armbruster
parent 43b1be65f0
commit e0e8a0ac2e
3 changed files with 16 additions and 11 deletions
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8
scripts/qapi/common.py
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@ -12,7 +12,7 @@
# See the COPYING file in the top-level directory.
import re
from typing import Optional, Sequence
from typing import Match, Optional, Sequence
#: Magic string that gets removed along with all space to its right.
@ -210,3 +210,9 @@ def gen_endif(ifcond: Sequence[str]) -> str:
#endif /* %(cond)s */
''', cond=ifc)
return ret
def must_match(pattern: str, string: str) -> Match[str]:
match = re.match(pattern, string)
assert match is not None
return match