[Haskell-cafe] Re: Fast Haskell Parser

Ben Lippmeier benl at ouroborus.net
Wed Mar 10 19:34:33 EST 2010

Hi John, 
Doing a Google search for "haskell parser" returns the following link as its first result. That's the parser that GHC uses.


You could also check out the following:


This would also be a perfect question to ask on the haskell-cafe mailing list...


On 11/03/2010, at 10:39 AM, John D. Earle wrote:

> I was thinking of ways to create an efficient Haskell parser. My initial thinking was to write a top down parser in Haskell, but if you want speed a table driven approach may make greater sense.
> Due to the existence of build bots there is a certain degree of compliancy concerning build times. I feel that convenience is an important factor. It should be convenient to build the source. Build bots make an assumption, namely the existence of a formal infrastructure. I believe that it should be possible to build something from source casually.
> This is a less demanding goal than high performance incremental builds. It would be nice to out perform make files because if you fail to do this, can it really be said that you are making progress? Correctness appears to be a low priority among computer programmers. That said, it may be worth investing some time in advance to figuring out how to best achieve both objectives, namely correctness and performance. Who knows skills acquired in one project may be useful in another and performance is usually welcome.
> So my question is, What sort of tools and methodologies exist in Haskell to create high performance parsers? My impression is the speed at which the parser performs its task is not the bottle-neck, but the parser might as well be designed to be efficient so as not to be intellectually lazy. It may even turn out that the parser may need to be efficient merely to compensate for the spawn of correctness, namely slow builds. 
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