[Haskell-cafe] Looking for maintainers or comaintainers on my Haskell projects
mblazevic at stilo.com
Fri Mar 17 14:27:40 UTC 2017
On 2017-03-16 05:26 PM, Ben Franksen wrote:
> I am glad my remark didn't scare you off, in retrospect my wording was
> perhaps a bit strong. Yes, John did a lot to make things as lazy as
> possible to avoid excessive memory consumption (cool to say that, isn't
> it). There is also some ugly type casting (unsafeCoerce) going on, since
> the parser keeps the alternatives in an array (remember that this is a
> packrat parser).
I should be able to replace the array with a user-defined record, I
submitted a paper to this year's ICFP demonstrating this. The only
problem would be backward compatibility, but if there are no current
users there's no problem.
> Unfortunately I can't spare the time to work on this ATM. But I would be
> glad if you would revive the project. PEGs offer some unique advantages
> for day-to-day parsing tasks, where you can't be bothered to write a
> separate lexer or mess around with 'try' until your harmless looking
> grammar actually accepts the source language. A fair portion of these
> can nowadays be handled nicely with regex-applicative (many file formats
> are actually regular) but now and again there is one where you need the
> power of a CFG.
We're on the same page here. I have a solution in mind that would allow
one to choose a parsing algorithm, from Parsec-style to Packrat to
parallel-parsing CFGs, and apply it to a single grammar specification
written with little syntactic overhead compared to Parsec. Some of it is
written up, some half-implemented.
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