[Cuis-dev] OMeta working again for Cuis 6.3

[Phil B]

Hi Michał,

I'm still around... just been busy with other things.  Thanks for your
interest and efforts!  I'll take a look at your changes though it will
probably be this weekend before I can get to it.

As far as making Cuis a first-class citizen: that's not likely to
happen, nor would it be desirable. (I experimented with that and the result
was not good... there's too much of an impedance mismatch)

Regarding the other areas you touched on:
1) Debugging: there should be a more robust OMeta parser (i.e. a subclass
of OMeta2) to better catch more errors (esp. recursion) at parse/compile
time, when possible.  It's entirely possible that the syntax needs to be
extended to support this.
2) Performance: assuming you're talking about runtime performance where you
have a parser being called repeatedly you probably want to look at creating
a parser that targets (i.e. emits) code for a more performant parser
(there's no law that says OMeta has to always target OMeta!) as OMeta's PEG
is going to have relatively poor runtime performance vs other parser
approaches, especially if you have any recursion in your parser and/or the
input to your parser is characters (i.e. parsing data files at runtime, for
example.)   I believe that's still an open problem with PEGs. (not sure as
I haven't kept up with the state of the art on this)
3) Cuis compiling etc: use OMeta to emit Cuis/Smalltalk code that is used
anywhere in the image, sure... as long as said emitted code is free of
OMeta dependencies.  Put another way: if your generated code is in a
subclass of OMeta2 and calls the parsing engine it would probably not be
safe enough to use as an image-level dependency, if your generated code is
*not* in a subclass of OMeta2 you might be fine.

Thanks,
Phil

On Wed, Apr 10, 2024 at 4:37 PM Michał Olszewski via Cuis-dev <
cuis-dev at lists.cuis.st> wrote:

> Hi all,
>
> I fixed OMeta package from pbella so now it works again for Cuis 6.3
> (>6291). Yay! I made a couple of tests with the grammar definitions and
> syntax highlighting and so far it's kind of back to the working state:
>
> https://github.com/michalo1334/OMeta-Cuis
>
> Just requested pull to original repo:
> https://github.com/pbella/OMeta-Cuis but not sure if the author is still
> active in the community.
>
> However, in OMeta-derived classes it incorrectly highlights instance
> variables in red and displays := instead of <-. If someone has time to
> take a quick look at the Shout styler code, would be great. Right now
> it's an ugly fix so that there is any highlighting at all -  it's nice
> to see a colored text.
>
> And then there is the problem to make OMeta first class citizen
> (debugging, improve performance, maybe even use it for Cuis compiling &
> code generation machinery?).
>
> Cheers,
> Michał
>
> --
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> Cuis-dev at lists.cuis.st
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>
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