[vim/vim] runtime(python): improve performance of number and ellipsis matching (PR #21194)
Julien Voisin
Problem: The floating-point .d number match and the two ellipsis
matches are slow: each begins with a look-behind, which cannot
be reduced to a fixed first character, so the automatic regexp
engine selects the slower NFA backend for them.
Solution: Force the backtracking engine with %#=1 on those three
patterns; it evaluates the look-behind far more efficiently.
Highlighting is unchanged.
Measured with :syntime over a 40000 line corpus: the three affected rules drop from ~0.13s to ~0.008s (about -93%), which cuts the total syntax parse cost by ~10% (1.85s to 1.65s).
You can view, comment on, or merge this pull request online at:
https://github.com/vim/vim/pull/21194
Commit Summary
- 97f33a6 runtime(python): improve performance of number and ellipsis matching
File Changes
(1 file)
- M runtime/syntax/python.vim (11)
Patch Links:
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Christian Brabandt
chrisbra left a comment (vim/vim#21194)thanks, nice
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