Nikolay Pavlov wrote:
> On Jul 9, 2013 4:58 PM, "Bram Moolenaar" <b...@moolenaar.net> wrote:
> >
> >
> > Grüner_Gimpel wrote:
> >
> > > I noticed that using Vim 7.4a the Vimwiki plugin works measurably
> > > slower with re=0 than with re=1. I figured out the reason is this
> > > regexp in the syntax definition:
> > >
> > >
> [[:alnum:]]\@<!\%(\%(\%(http\|https\|file\|ftp\|gopher\|telnet\|nntp\|ldap\|rsync\|imap\|pop\|irc\|ircs\|cvs\|svn\|svn+ssh\|git\|ssh\|fish\|sftp\):\%(\/\/\)\)\|\%(mailto\|news\|xmpp\|sip\|sips\|doi\|urn\|tel\):\)\S\{-1,}\%(([^
> \t()]*)\)\=\S*
> > >
> > > You may know what it is supposed to match.
> > > Removing some of the branches makes it faster and so does removing
> > > [[:alnum:]]\@<!
> > >
> > > I don't know if there is a standard method for measuring speed of the
> > > syntax highlight, but here is what I have done:
> > > - open a relatively large file
> > > - :set syn=off
> > > - :syntax match Number
> /[[:alnum:]]\@<!\%(\%(\%(http\|https\|file\|ftp\|gopher\|telnet\|nntp\|ldap\|rsync\|imap\|pop\|irc\|ircs\|cvs\|svn\|svn+ssh\|git\|ssh\|fish\|sftp\):\%(\/\/\)\)\|\%(mailto\|news\|xmpp\|sip\|sips\|doi\|urn\|tel\):\)\S\{-1,}\%(([^
> \t()]*)\)\=\S*/
> > > - scroll with <c-e> and <c-y>
> > > - extremely slow with re=0 but normal slow (*wink*) with re=1
> > >
> > > So, can this behavior be considered as a bug?
> >
> > The main problem is the [[:alnum:]]\@<! item. Have you tried adding a
> > limit? Should be [[:alnum:]]\@1<!
> >
> > Or perhaps using \< instead will work.
> >
> > For measuring times: use :syntime.
>
> Could not it deduce a limit by itself in such simple cases?
It does, but I'm not sure what patterns it works for:
nfa_max_width()
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