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import argparse
import json
from typing import Any
from typing import Dict
from typing import List
from typing import Optional
from typing import Sequence
from typing import Tuple
def raise_duplicate_keys(
ordered_pairs: List[Tuple[str, Any]],
) -> Dict[str, Any]:
d = {}
for key, val in ordered_pairs:
if key in d:
raise ValueError(f'Duplicate key: {key}')
else:
d[key] = val
return d
def main(argv: Optional[Sequence[str]] = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument('filenames', nargs='*', help='Filenames to check.')
args = parser.parse_args(argv)
retval = 0
for filename in args.filenames:
with open(filename, 'rb') as f:
try:
json.load(f, object_pairs_hook=raise_duplicate_keys)
except ValueError as exc:
print(f'{filename}: Failed to json decode ({exc})')
retval = 1
return retval
if __name__ == '__main__':
raise SystemExit(main())
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