[Haskell-cafe] list of range
merijn at inconsistent.nl
Mon Oct 4 13:45:22 UTC 2021
Sounds like you want something along the lines of https://hackage.haskell.org/package/data-interval
Which has types for open/closed intervals and sets/maps of them.
> On 4 Oct 2021, at 15:26, PICCA Frederic-Emmanuel <frederic-emmanuel.picca at synchrotron-soleil.fr> wrote:
> Hello, I need to parse a commande line which allows user to describe indices like this
> 1 -> only one indice
> 1-5 -> [1..5]
> 1-5 6-10 ...-> [1..5] ++ [6..10]
> My question is what it the best type in order to store this information ?
> Range Int = Range Int
> | RangeFromTo Int Int
> | Range Int <+> Range Int
> At some point I would like to add the possibility to have multiples Indices with the ','
> 1,3,5 -> [1,3,5] list of indices
> This type is used at some point as a List.
> My question is, are you aware of a similar type in the standar library.
> This is the kind of information tahth w should parse when we request to print pages. (list of pages to print).
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