[3.11] gh-153030: Fix quadratic complexity in incremental parsing in HTMLParser (GH-153031)#153042
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[3.11] gh-153030: Fix quadratic complexity in incremental parsing in HTMLParser (GH-153031)#153042serhiy-storchaka wants to merge 1 commit into
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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. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> (cherry picked from commit bcf98dd)
This was referenced Jul 4, 2026
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Manual backport of GH-153031 to 3.11.
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.