[Haskell-beginners] Parsec

Patrick LeBoutillier patrick.leboutillier at gmail.com
Fri Aug 6 07:59:03 EDT 2010


I started using Data.Binary yesterday for a project and it's nice. I'm
not sure it's possible, but perhaps you could switch tools along the

- Parse the ASCII bit with Parsec ;
- Give the remaining ByteString to Data.Binary for the binary part ;
- Switch back and forth as required.


On Fri, Aug 6, 2010 at 5:03 AM, C Gosch <ch.gosch at googlemail.com> wrote:
> 2010/8/6 Dean Herington <heringtonlacey at mindspring.com>
>> At 11:42 PM +0200 8/5/10, C Gosch wrote:
>>> Hi,
>>> does anyone here know their way around in Parsec?
>>> I'm trying to parse a file which contains some binary parts too.
>>> I have been using Parsec 3.0.1 to parse the first ASCII part, but all the
>>> parsers are
>>> returning Char type tokens, so it would not work with the binary parts ..
>>> is there any way to do this?
>>> I am using Text.Parsec.ByteString.Lazy.
>>> Note that I'm new to Haskell and Parsec, and doing this within a small
>>> project that
>>> I basically do to get a grip on Haskell (and Parsec, because it appears
>>> to be really nifty and I want to learn more about it).
>>> Thanks for any hints,
>>> Christian
>> Parsing binary parts of a file is not inherently a problem.  A parser can
>> return any type; different parsers in your application will likely return
>> different types.
>> If you include some code we'll be able to help you more specifically.
>> Dean
> You're right, I probably used the wrong words .. I meant that apparently the
> tokens Parsec uses are of type Char, and I would actually at some point
> like to continue parsing, but using different tokens. Sorry if I still got
> it wrong, I'm new :)  I can post some code later, as I don't have it here
> right now.
> Cheers,
> Christian
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Patrick LeBoutillier
Rosemère, Québec, Canada

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