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Define recur by closing over the higher-order functions.

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This commit is contained in:
Rob Rix 2016-08-04 11:12:52 -04:00
parent d9a1bd29f2
commit e41a0589d5
1 changed files with 5 additions and 5 deletions
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10
src/Interpreter.hs
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@ -30,11 +30,11 @@ diffTerms :: (Eq leaf, Hashable leaf, Eq (Record fields), HasField fields Catego
diffTerms construct comparable cost a b = fromMaybe (replacing a b) $ diffComparableTerms construct comparable cost a b
diffComparableTerms :: (Eq leaf, Hashable leaf, Eq (Record fields), HasField fields Category) => DiffConstructor leaf (Record fields) -> Comparable leaf (Record fields) -> SES.Cost (Diff leaf (Record fields)) -> Term leaf (Record fields) -> Term leaf (Record fields) -> Maybe (Diff leaf (Record fields))
diffComparableTerms construct comparable cost a b
| (category <$> a) == (category <$> b) = hylo construct runCofree <$> zipTerms a b
| comparable a b = runAlgorithm construct recur cost getLabel (Just <$> algorithmWithTerms construct a b)
| otherwise = Nothing
where recur a b = diffComparableTerms construct comparable cost a b
diffComparableTerms construct comparable cost = recur
where recur a b
| (category <$> a) == (category <$> b) = hylo construct runCofree <$> zipTerms a b
| comparable a b = runAlgorithm construct recur cost getLabel (Just <$> algorithmWithTerms construct a b)
| otherwise = Nothing
getLabel (h :< t) = (category h, case t of
Leaf s -> Just s
_ -> Nothing)