Re: How to add pseudo vector types

[Clément Pit-Claudel]

On 7/21/21 7:26 AM, Eli Zaretskii wrote:
> I still don't see the point.  Can you describe in more detail what
> would you suggest doing with the list of gap changes?  Just take a
> specific example of a small set of gap changes and tell how to use
> that.

I can try, but the idea was half-baked from the start, so I'm not sure how much 
value it will bring.  All I was saying is that depending on how robust TS is, 
feeding it:

   <valuable text><small bit of the gap because the gap moved while TS was 
scanning><more valuable data>

and then, knowing that the gap had moved, re-feeding it just the area that 
corresponds to the places around the boundaries of the gap might yield a 
speedup.

So if the buffer is XYYGGGZ, where G is the gap, and becomes XGGIYYZ while 
we're scanning because of cursor motion + an insertion, then TS might see 
XYGIYYZ, due to concurrent mutations; but if we recorded that the gap moved and 
insertions happened at -#####---, then we can re-feed GGIYY to TS (omitting the 
Gs, of course), and hopefully it can reuse the parse of X and Z.  If X and Z 
are long enough, that can be valuable.

Alternatively, keeping the list of changes allows us to maintain a copy of the 
buffer that TS uses for scanning, with updates delayed until TS is done 
scanning.