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Fixed type inference for multidimensional array literals

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Fixes #93
This commit is contained in:
Neil Brown 2009-04-16 12:27:37 +00:00
parent a8b1697df6
commit decd2d16df
1 changed files with 13 additions and 15 deletions
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28
frontends/OccamTypes.hs
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@ -197,20 +197,19 @@ checkExpressionBool e = checkExpressionType A.Bool e
-- | Pick the more specific of a pair of types.
betterType :: A.Type -> A.Type -> A.Type
betterType t1 t2
= case betterType' t1 t2 of
Left () -> t1
Right () -> t2
betterType A.Infer t = t
betterType t A.Infer = t
betterType t@(A.UserDataType _) _ = t
betterType _ t@(A.UserDataType _) = t
betterType t1@(A.Array ds1 et1) t2@(A.Array ds2 et2)
| length ds1 == length ds2
= A.Array (zipWith betterDim ds1 ds2) $ betterType et1 et2
| length ds1 < length ds2 = t1
where
betterType' :: A.Type -> A.Type -> Either () ()
betterType' A.Infer t = Right ()
betterType' t A.Infer = Left ()
betterType' t@(A.UserDataType _) _ = Left ()
betterType' _ t@(A.UserDataType _) = Right ()
betterType' t1@(A.Array ds1 et1) t2@(A.Array ds2 et2)
| length ds1 == length ds2 = betterType' et1 et2
| length ds1 < length ds2 = Left ()
betterType' t _ = Left ()
betterDim A.UnknownDimension d@(A.Dimension _) = d
-- All other cases (both unknown, right is unknown, both known), use left:
betterDim d _ = d
betterType t _ = t
--}}}
--{{{ more complex checks
@ -1241,8 +1240,7 @@ inferTypes = occamOnlyPass "Infer types"
do subT <- trivialSubscriptType m underT
(elemT, aes') <- doElems subT aes
let dim = makeDimension m (length aes)
return (applyDimension dim wantT,
A.Several m aes')
return (addDimensions [dim] elemT, A.Several m aes')
A.Record _ ->
do nts <- recordFields m underT
aes <- sequence [doArrayElem t ae >>* snd