If you want, I could add a variation on `groupsBy` named `groupsBy'`
that does the grouping using adjacent elements
On 8/9/2015 5:21 PM, ar...@arbor.net wrote:
I have a large stream of data, and want to break it into parts where
subsequent elements define whether they belong to the same part or not.
A simple example will be the stream of integers, and the new part
"starts" when there is a "hole" so [1,2,3,5,6,7,9] is logically
"grouped" as [1,2,3],[5,6,7],[9].
The "real life" example is only complicated by how the predicate "elem
-> elem -> Bool" works, so the idea stays the same.
I tried to use "groupsBy :: a -> a -> Bool" from "pipes-groups"
library, and I need exactly this behaviour in terms of in/out, but it
seems that the first argument of a predicate is always the first
element of the group, not the previous element of a sequence.
I then tried to find if there is a simple way to produce a sliding
window of 2 elements so I could still use "groupsBy" in a way:
[1,2,3,5,6,7,9] -> [(1,1),(1,2),(2,3),(3,5),(5,6),(6,7),(7,9)] ->
[(True, 1), (True, 2), (True, 3), (False, 5), (True, 6), (True, 7),
(False, 9)] -> [1,2,3],[5,6,7],[9]
But I couldn't find any sliding window combinator or library in pipes.
How do I solve this problem with Pipes?
Cheers,
Alexey.
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