[3.15] gh-153030: Fix quadratic complexity in incremental parsing in HTMLParser (GH-153031)#153038
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serhiy-storchaka merged 1 commit intoJul 5, 2026
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…TMLParser (pythonGH-153031) When an unterminated construct (e.g. a tag or comment) spanned many feed() calls, rescanning the growing buffer and concatenating new data onto it were both quadratic. New data is now accumulated in a list and only joined and parsed once enough has piled up. (cherry picked from commit bcf98dd) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jul 4, 2026
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When an unterminated construct (e.g. a tag or comment) spanned many
feed() calls, rescanning the growing buffer and concatenating new data
onto it were both quadratic. New data is now accumulated in a list and
only joined and parsed once enough has piled up.
(cherry picked from commit bcf98dd)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com