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Better handling of empty prefix list

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Kovid Goyal 2022-02-04 16:41:08 +05:30
parent b4e6ae8c2b
commit ca0a977b09
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1 changed files with 9 additions and 6 deletions
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15
src/calibre/ebooks/metadata/__init__.py
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@ -163,12 +163,15 @@ def get_title_sort_pat(lang=None):
ans = frozenset(ans) if ans is not None else frozenset(data['eng'])
except Exception:
ans = frozenset((r'A\s+', r'The\s+', r'An\s+'))
ans = '|'.join(ans)
ans = '^(%s)'%ans
try:
ans = re.compile(ans, re.IGNORECASE)
except:
ans = re.compile(r'^(A|The|An)\s+', re.IGNORECASE)
if ans:
ans = '|'.join(ans)
ans = '^(%s)'%ans
try:
ans = re.compile(ans, re.IGNORECASE)
except:
ans = re.compile(r'^(A|The|An)\s+', re.IGNORECASE)
else:
ans = re.compile('^$') # matches only the empty string
_title_pats[lang] = ans
return ans