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Today's Topics:
1. how to parse (PICCA Frederic-Emmanuel)
2. Re: how to parse (Francesco Ariis)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Dec 2019 09:47:41 +0000
From: PICCA Frederic-Emmanuel
<frederic-emmanuel.pi...@synchrotron-soleil.fr>
To: "The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell" <beginners@haskell.org>
Subject: [Haskell-beginners] how to parse
Message-ID:
<a2a20ec3b8560d408356cac2fc148e53017d846...@sun-dag3.synchrotron-soleil.fr>
Content-Type: text/plain; charset="us-ascii"
Hello,
I have a bunch of files names like this
<prefix>_data_00006.cbf
I would like to parse it into this type
data CbfDataFile = CbfDataFile Text Int
where
Test is <prefix> and Int = 6
I am using attoparsec, I started to write my parser like this
parseCbfDataFile :: String -> Parser CbfDataFile
parseCbfDataFile s = do
prefix <- ????
string "_data_"
v <- decimal
string ".cbf"
return (CbfDataFile prefix v)
So my question, is how to I write this parser. I miss for now the prefix part,
and it seems also to me thaht I need something else for the numeric part.
thanks for your help
Frederic
------------------------------
Message: 2
Date: Tue, 10 Dec 2019 11:28:03 +0100
From: Francesco Ariis <fa...@ariis.it>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] how to parse
Message-ID: <20191210102803.ga9...@x60s.casa>
Content-Type: text/plain; charset=us-ascii
On Tue, Dec 10, 2019 at 09:47:41AM +0000, PICCA Frederic-Emmanuel wrote:
> I have a bunch of files names like this
> <prefix>_data_00006.cbf
>
> [...]
>
> I am using attoparsec, I started to write my parser like this
>
>
> parseCbfDataFile :: String -> Parser CbfDataFile
> parseCbfDataFile s = do
> prefix <- ????
> string "_data_"
> v <- decimal
> string ".cbf"
> return (CbfDataFile prefix v)
>
>
> So my question, is how to I write this parser.
`manyTill` [1] should do
[1]
https://hackage.haskell.org/package/attoparsec-0.13.2.2/docs/Data-Attoparsec-Combinator.html#v:manyTill
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