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Added arrowsuntil (#39)

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iko 2020-02-19 20:47:50 +03:00 committed by GitHub
parent 1ea7c742c6
commit 6091e0c6c9
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1 changed files with 8 additions and 0 deletions
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8
src/Data/Isoparsec/Internal.hs
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@ -9,6 +9,8 @@ module Data.Isoparsec.Internal
check,
unroll,
arrowsWhile,
assoc,
arrowsUntil,
)
where
@ -82,6 +84,9 @@ class
arrowsWhile :: (PolyArrow m SemiIso, ArrowPlus m) => m () a -> m () [a]
arrowsWhile f = ((f &&& arrowsWhile f) >>^ siCons) <+^ isoConst () []
arrowsUntil :: (ArrowPlus m, Eq a, PolyArrow m SemiIso) => m () a -> m () b -> m () ([a], b)
arrowsUntil a b = (arr (konst []) &&& b) <+> (a &&& arrowsUntil a b >>^ (assoc >>> first siCons))
unroll :: (PolyArrow m SemiIso, ArrowPlus m, Eq a) => a -> m a (b, a) -> m () [b]
unroll a f = (konst a ^>> unroll' f) <+^ isoConst () []
where
@ -117,3 +122,6 @@ check f = isoCheck f id id
konst :: Eq x => x -> SemiIso () x
konst x = isoConst () x >>> check (== x)
assoc :: SemiIso (a, (b, c)) ((a, b), c)
assoc = siPure (\(a, (b, c)) -> ((a, b), c)) (\((a, b), c) -> (a, (b, c)))