string_processing: Performance regression #2314
Description
% time black --diff ~/some/file.py
All done! ✨ 🍰 ✨
1 file would be left unchanged.
black --diff ~/some/file.py 17.78s user 0.18s system 99% cpu 18.067 total
% time black --experimental-string-processing --diff ~/some/file.py
< many changes snipped >
would reformat /Users/jelle/some/file.py
All done! ✨ 🍰 ✨
1 file would be reformatted.
black --experimental-string-processing --diff 389.93s user 3.25s system 99% cpu 6:35.03 total
I can't share the file since it's private code, but it's 14000 lines of a single list display.