Re: [Haskell-cafe] list of range

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. Cheers, Merijn

On 4 Oct 2021, at 15:26, PICCA Frederic-Emmanuel 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).

Cheers

Frederic

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