[Kst] Re: branches/work/kst/portto4/kst/src/datasources/ascii

[Brisset, Nicolas]

> Fixed-width columns are optimized, column width == 5
>  1234 1234 1234 1234;
> -1234-1234 1234 1234;
> -1234 1234 1234 1234;
> +1234 1234-1234-1234;
> 
> but we could also optimize for different column width are constant:
>  1234; 123456789; 12; 1234444;
>  1234;-123456789; 12;+1234444;
> 
> only the place of the ; has to be the same in each row.
> 
> And I've seen no problems when the number string starts with a
whitespace.
OK, here are a couple of questions to be able to improve the GUI, which
is a bit broken/hard to figure out currently.

So if I understand it correctly, when all columns don't have the same
width but each still has a constant width, then we can perform a
specific optimization. Is that correct? 

Can we optimize more if all columns have the same width than if each has
a constant width?

And another important question: can you compute the width of each column
reliably when they are delimited by whitespace, or does it need a custom
delimiter? Finding out the width with whitespace sounds tricky, because
you could have a sign coming only after a large number of samples, and
we can't parse the whole file to determine which optimization is
applicable!
Or do we have a simple criterion such as: the first whitespace char
after the numbers in a given column are always aligned?

Depending on your answers, I think we have to change the GUI (and
unfortunately the code and possibly storage format in the .kst) a bit. 

Nicolas

P.S.: since we're doing so much work on the ASCII datasource, I think
I'll end up adding units as well for 2.0.3. 


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