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🔥 the helper function.

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Rob Rix 2017-09-10 17:46:25 +01:00
parent 49fd598b92
commit 80994e27dc
1 changed files with 3 additions and 4 deletions
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7
src/Diff.hs
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@ -67,10 +67,9 @@ evalDiffR algebra = flip go mempty
Var var -> algebra (Var var) env
evalDiffRM :: (Functor syntax, Reader (Env (Diff syntax ann, Eff fs a)) :< fs) => (DiffF syntax ann (Diff syntax ann, Eff fs a) -> Eff fs a) -> Diff syntax ann -> Eff fs a
evalDiffRM algebra = go
where go = para $ \ diff -> case diff of
Copy bindings _ _ -> local (flip (foldr (uncurry envExtend)) bindings) (algebra diff)
_ -> algebra diff
evalDiffRM algebra = para $ \ diff -> case diff of
Copy bindings _ _ -> local (flip (foldr (uncurry envExtend)) bindings) (algebra diff)
_ -> algebra diff
diffSum :: (Foldable syntax, Functor syntax) => (forall a. Patch a -> Int) -> Diff syntax ann -> Int