[Lazarus] Regex and Syntax Highlighting

[Martin]

On 26/05/2010 20:29, Mattias Gaertner wrote:
> On Wed, 26 May 2010 20:09:47 +0100
> Martin<lazarus at mfriebe.de>  wrote:
>    
>> On 26/05/2010 19:54, Mattias Gaertner wrote:
>>      
>>> Apparently it uses some kind of line state too and only updates
>>> till the visible area. Maybe synedit can do the same. At the moment
>>> syndit updates everything too often.
>>>
>>>        
>> It's been on my todo for a long time (and some prep work, like moving
>> highlighter related functions from synedit to highlighter  have started....)
>>
>> It will be limited though =>  because folding needs to know the full deal
>> (as scrollbars depend on the total of visible (unfolded) lines.
>> Of course, if no nodes are folded =>  folding doesn't care (even if
>> switches on). It's only when a node actually is folded =>  then folding
>> needs to verify it still exists.
>>      
> I see.
> But at least "replace all" could be improved.
>    
Hm How to you mean. Unless there is a bug I don't know about.

The search replace is done inside a "PaintLock" => that (to the very 
best of my knowledge) prevents the highlighter from doing anything.

Only one exception:
- if you chose to "prompt and confirm" => then each time a prompt comes, 
the paintlock is interupted, and a rescan is done => but this si needed, 
because in order to prompt, the display must be updated => the 
highlighter must scan.

But without prompt, it should only scan once at the end of the replace. 
(if there is evidence it does more => let me know)


>> Another improvement (but much less noticable) would be to separate
>> structural and visual scan.
>>      
> But that would mean traversing two times though the code. Bad for
> processor caching.
>    

Not more than currently:

1) The highlighter scans the in order to update all ranges (but that 
does not store any mid-line info)
2) each time a line is painted => that line is parsed, and token by 
token returned to be painted.

so the first scan can skip alot of details => but it requires a lot of 
rewrite work on the highlighter.

there is plenty of other optimizations  in and outside the highlighter....

Martin