openmedialibrary/oml/meta/utils.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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import re
import stdnum.isbn
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def normalize_isbn(value):
return ''.join([s for s in value if s.isdigit() or s == 'X'])
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def find_isbns(text):
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if isinstance(text, bytes):
text = text.decode()
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matches = re.compile('\d[\d\-X\ ]+').findall(text)
matches = [normalize_isbn(value) for value in matches]
return [isbn for isbn in matches if stdnum.isbn.is_valid(isbn)
and len(isbn) in (10, 13)
and isbn not in (
'0' * 10,
'0' * 13,
)]