Marius,
Thanks for the query. Yes, there is a not so subtle point. Take a look at
the
grammar<http://code.google.com/p/rlambda/source/browse/trunk/src/main/bnfc/rlambda.cf>.
To my way of thinking, these are it's advantages.
- Readable (and therefore maintainable)
- Targets the following languages with only 1 small change to the build
process
- Java -- therefore available in Scala, but faster than Scala
- C/C++
- C#
- F#
- OCaml
- Haskell
- XML
- Generates visitor patterns
i find the parser combinator stuff certainly idiosyncratic, but nearly
unreadable. i also note that in Haskell, the language (community) that
originated the parser combinator stuff, the parser combinator machinery is
nicely hidden behind a more standard BNF frontend, such as Alex + Happy.
This is the way it should be.
Best wishes,
--greg
On Tue, May 5, 2009 at 4:15 AM, marius d. <[email protected]> wrote:
>
> Any reason why not using Scala's combinator parsers? ... or this is
> beyond the point of the exercise?
>
> Br's
> Marius
>
> On May 5, 4:55 am, Meredith Gregory <[email protected]> wrote:
> > Lifted, Scalad and lasses,
> >
> > Recently Martin passed along a little code challenge regarding scalable
> > abstractions for building a little lambda calculus evaluator. i've
> finally
> > put together a 1st draft response. i've still got a lot of debugging to
> do,
> > but the solution <http://code.google.com/p/rlambda/source/browse/trunk/>
> is
> > end-to-end.
> >
> > - there is a parser and evaluator hosted inside a lift-based
> > web-container
> > - the parser is built using BNFC and can target
> > Java/C#/OCaml/Haskell/F#/...
> > - the parser comes with visitor pattern support
> > - the evaluator is built in a two-level type style and demonstrates
> that
> > the only OO you need is just enough to make Scala happy -- the
> abstractions
> > are all FP-based
> >
> > As i said, this is very much a draft and the code falls over most of the
> > time. But, at this point, it's really a pedagogical device and framework
> for
> > hosting and evaluating different solutions.
> >
> > Again, one the main reasons i see for using Scala is it's seamless
> interop
> > with Java. The OCaml solution is intriguing (though ther are some
> > strangenesses in it that i've yet to grok), but i would like to see that
> > solution hosted in this manner.
> >
> > Best wishes,
> >
> > --greg
> >
> > --
> > L.G. Meredith
> > Managing Partner
> > Biosimilarity LLC
> > 1219 NW 83rd St
> > Seattle, WA 98117
> >
> > +1 206.650.3740
> >
> > http://biosimilarity.blogspot.com
> >
>
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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