Re: syntime report slow/lags

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.

2018-01-05 21:07 GMT+01:00 Ben Fritz <fritzophrenic@gmail.com>:

On Thursday, December 21, 2017 at 8:41:39 AM UTC-6, Ni Va wrote:
> 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

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?

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