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runtime(python): Update syntax, improve pythonNumber pattern performance

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- Improve the performance of all pythonNumber patterns by unrolling
  digit/underscore sequence loops.
- Split the float literal pattern into two simpler patterns.

fixes:  #19625 (Reported by James McCoy)
closes: #19630

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Doug Kearns
2026-03-11 19:47:55 +00:00
committed by Christian Brabandt
parent 49a5a80410
commit 2cf18fcc24
6 changed files with 114 additions and 8 deletions
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22
runtime/syntax/python.vim
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@@ -5,6 +5,7 @@
" 2025 Sep 25 by Vim Project: fix wrong type highlighting #18394
" 2025 Dec 03 by Vim Project: highlight t-strings #18679
" 2026 Jan 26 by Vim Project: highlight constants #18922
" 2026 Mar 11 by Vim Project: fix number performance #19630
" Credits: Neil Schemenauer <nas@python.ca>
" Dmitry Vasiliev
" Rob B
@@ -270,16 +271,21 @@ syn match pythonEscape "\\$"
" https://docs.python.org/reference/lexical_analysis.html#numeric-literals
if !exists("python_no_number_highlight")
" numbers (including complex)
syn match pythonNumber "\<0[oO]\%(_\=\o\)\+\>"
syn match pythonNumber "\<0[xX]\%(_\=\x\)\+\>"
syn match pythonNumber "\<0[bB]\%(_\=[01]\)\+\>"
syn match pythonNumber "\<\%([1-9]\%(_\=\d\)*\|0\+\%(_\=0\)*\)\>"
syn match pythonNumber "\<\d\%(_\=\d\)*[jJ]\>"
syn match pythonNumber "\<\d\%(_\=\d\)*[eE][+-]\=\d\%(_\=\d\)*[jJ]\=\>"
syn match pythonNumber "\<0[oO]_\=\o\+\%(_\o\+\)*\>"
syn match pythonNumber "\<0[xX]_\=\x\+\%(_\x\+\)*\>"
syn match pythonNumber "\<0[bB]_\=[01]\+\%(_[01]\+\)*\>"
syn match pythonNumber "\<\%([1-9]\d*\%(_\d\+\)*\|0\+\%(_0\+\)*\)\>"
syn match pythonNumber "\<\d\+\%(_\d\+\)*[jJ]\>"
syn match pythonNumber "\<\d\+\%(_\d\+\)*[eE][+-]\=\d\+\%(_\d\+\)*[jJ]\=\>"
" \d\.
syn match pythonNumber
\ "\<\d\%(_\=\d\)*\.\%([eE][+-]\=\d\%(_\=\d\)*\)\=[jJ]\=\%(\W\|$\)\@="
\ "\<\d\+\%(_\d\+\)*\.\%([eE][+-]\=\d\+\%(_\d\+\)*\)\=[jJ]\=\%(\W\|$\)\@="
" \d\.\d
syn match pythonNumber
\ "\%(^\|\W\)\@1<=\%(\d\%(_\=\d\)*\)\=\.\d\%(_\=\d\)*\%([eE][+-]\=\d\%(_\=\d\)*\)\=[jJ]\=\>"
\ "\<\d\+\%(_\d\+\)*\.\d\+\%(_\d\+\)*\%([eE][+-]\=\d\+\%(_\d\+\)*\)\=[jJ]\=\>"
" \.\d
syn match pythonNumber
\ "\%(^\|\W\)\@1<=\.\d\+\%(_\d\+\)*\%([eE][+-]\=\d\+\%(_\d\+\)*\)\=[jJ]\=\>"
endif
" Group the built-ins in the order in the 'Python Library Reference' for