syntime report slow/lags

[Ni Va]

Hi,

Here is a syntime report that show slow regexp

TOTAL COUNT MATCH SLOWEST AVERAGE NAME PATTERN
0.703272 897 78 0.007309 0.000784 cCustomAngleBrackets \v%(<operator\_s*)@<!%(%(\_i|template\_s*)@<=\<[<=]@!|\<@<!\<[[:space:]<=]@!)
0.089086 827 0 0.049759 0.000108 cppRawString \%(u8\|[uLU]\)\=R"\z([[:alnum:]_{}[\]#<>%:;.?*\+\-/\^&|~!=,"']\{,16}\)(
0.053747 898 71 0.000639 0.000060 cCustomFunc \w\+\s*(\@=

How can I fix the first and second one ?
Thank you

[Ben Fritz]

For the first, it uses a couple lookbehind assertions with unlimited distance which can be very slow. If you can limit the distance to look back, you can make it much faster (see the help just under ":help /\@<!", for "\@123<!").

Unfortunately if you really need an unbounded amount of whitespace/newlines in your lookbehind, this may not be an option for you. You can experiment with breaking up the pattern and using nextgroup (:help :syn-nextgroup) but no guarantees there.

I'm not sure what would make the second item slow from what you've posted. Is that the complete pattern?

[Ni Va]

Hi Ben,

Code is here :

https://github.com/octol/vim-cpp-enhanced-highlight/blob/master/after/syntax/cpp.vim

Thank you for syn-nextgroup even if it is too difficult for ma comprehension.

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[Ni Va]

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Entire patterns in comment :


" syn region cCustomAngleBrackets matchgroup=AngleBracketContents start="\v%(<operator\_s*)@<!%(%(\_i|template\_s*)@<=\<[<=]@!|\<@<!\<[[:space:]<=]@!)" end='>' contains=@cppSTLgroup,cppStructure,cType,cCustomClass,cCustomAngleBrackets,cNumbers
syn region cCustomAngleBrackets matchgroup=AngleBracketContents start="\v%(<operator\_s\{64})@123<!%(%(\_i|template\_s\{64})\zs\<[<=]@!|\<@123<!\<[[:space:]<=]@!)" end='>' contains=@cppSTLgroup,cppStructure,cType,cCustomClass,cCustomAngleBrackets,cNumbers
syn match cCustomBrack "<\|>" contains=cCustomAngleBrackets
" syn match cCustomTemplateFunc "\w\+\s*<.*>(\@=" contains=cCustomBrack,cCustomAngleBrackets
syn match cCustomTemplateFunc "\w\+\s*<.\{-}>(\@=" contains=cCustomBrack,cCustomAngleBrackets