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Handle alternations of choices on both sides.

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Rob Rix 2017-04-26 12:04:34 -04:00
parent 38a92b7eda
commit ffe7b2ff66
1 changed files with 1 additions and 0 deletions
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src/Data/Syntax/Assignment.hs
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@ -147,6 +147,7 @@ instance Enum symbol => Alternative (Assignment (Node symbol)) where
(Symbol s1 `Then` _, Symbol s2 `Then` _) -> Choose (IntMap.fromListWith (flip const) [(fromEnum s1, a), (fromEnum s2, b)]) `Then` identity
(Symbol s `Then` _, Choose choices `Then` continue) -> Choose (IntMap.insertWith const (fromEnum s) a (fmap continue choices)) `Then` identity
(Choose choices `Then` continue, Symbol s `Then` _) -> Choose (IntMap.insertWith (flip const) (fromEnum s) b (fmap continue choices)) `Then` identity
(Choose choices1 `Then` continue1, Choose choices2 `Then` continue2) -> Choose (IntMap.union (fmap continue1 choices1) (fmap continue2 choices2)) `Then` identity
_ -> wrap $ Alt a b
instance Show symbol => Show1 (AssignmentF (Node symbol)) where