tutoriald-design

[tutoriald-design] RE: tutoriald-design digest, Vol 1 #3 - 3 msgs

[Spencer O. <so...@pr...>]

An LALR(1) grammar can be found at the www.thethirdmanifesto.com website.

As far as parser and parser generators go I have no inclination
to using one over the other (mostly because I've never done it before ;)).

I have been trying out the parser engine from GOLD simply because I like
the claims it makes regarding language independence. *shrug*.  One of the
chief
concerns that I have with the Alphora implementation is its reliance on the 
language C#.  Not that I have anything against C# per se, but rather being
cornered into using a language in the first place. 

From TTM:

"We remark that it would probably be desirable in practice to suport an
"external"
format of <user scalar op def> as well.  Syntactically, such a production
rule
would include, not a <statement> (as in the grammar), but rather a reference
to some
external file in which the code that implements the operator can be found".

This is what Alphora has done with the "class .." portion of their language
D4. However
I much prefer the second possibility from TTM.

"It might also be desirable to support a format of <user scalar op def> that
includes neither
a <statement> not an external erference; such a format would define merely
what 
Chapters 13 and 14 call a "specification signature" for the operator in
question, and
the implementation code would then have to be defined elsewhere."

-spencer

Re: [tutoriald-design] RE: tutoriald-design digest, Vol 1 #3 - 3 msgs

[Leandro F. C. D. <lea...@ma...>]

On Thu, 2002-09-12 at 13:41, Spencer Olson wrote:
>=20
> One of the chief
> concerns that I have with the Alphora implementation is its reliance on t=
he=20
> language C#.  Not that I have anything against C# per se, but rather bein=
g
> cornered into using a language in the first place.=20

	Then I think you will like to learn that Alphora Dataphor does not
corner you into C#.  In fact, the Dataphor D, named D4, is more based on
Pascal.  It uses C# as one would use Java to create a new language, as a
libraries and virtual machine framework.

	BTW, welcome.  Sorry for the sorry state of the project, but just after
creating it I started travelling around like crazy, and ended up first
being fired, than being four months looking for a job, then emigrating
to Switzerland.  A rough road, but I hope to be settled in a few more
weeks and then do something more useful.

	Meanwhile, if anyone has done something, you are welcome to talk about
and even post!  I am the project owner, but if someone has something
real to show, I would be willing to accept co-owner or even transfer the
whole thing.

	About implementations: when I stopped thinking about it, I was
considering doing a Scheme implementation, kinda like SchemeQL but a
valid D.  For a storage engine, I was considering PostgreSQL, as it has
high relational pedigree, coming from University Ingres and its nice
QUEL relational calculus language perhaps it still has all the hooks to
support a second language.  But I would also consider using the alpha
GNU SQL Server, because I favor transferring copyrights to the FSF.

	Thanks a lot for livening this up!


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