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📝 Find'.

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Rob Rix 2019-10-08 15:40:41 -04:00
parent 83bead5840
commit 607f8263a5
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semantic-tags/src/AST/Element.hs
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@ -30,6 +30,7 @@ type family Find sub sup :: Side where
Find t (l :+: r) = Find' 'L t l <> Find' 'R t r Find t (l :+: r) = Find' 'L t l <> Find' 'R t r
Find _ _ = 'None Find _ _ = 'None
-- | Helper to compute the side an element occurs on.
type family Find' (side :: Side) sub sup :: Side where type family Find' (side :: Side) sub sup :: Side where
Find' s t t = s Find' s t t = s
Find' s t (l :+: r) = Find' s t l <> Find' s t r Find' s t (l :+: r) = Find' s t l <> Find' s t r