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Get rid of the dummy values

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Niels G. W. Serup 2024-10-06 16:17:09 +02:00
parent 424a688d15
commit 08fc0f30e4
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1 changed files with 8 additions and 7 deletions
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15
byg/src/Function.hs
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@ -1,3 +1,4 @@
{-# LANGUAGE GADTs #-}
{-# LANGUAGE FunctionalDependencies #-}
module Function
( concatStrings
@ -78,19 +79,19 @@ lowerString :: TokenableTo String a => a -> DepGenM (Token String)
lowerString a = runFunction LowerString =<< toToken a
class WitnessFor w t | w -> t where
emptyValue :: w -> t
class (Show w, Lift w) => WitnessFor w t | w -> t
data StringType = StringType
instance WitnessFor StringType String where
emptyValue StringType = ""
data StringType = StringType deriving (Show, Lift)
instance WitnessFor StringType String
data ElemOf a = ElemOf a deriving (Show, Lift)
data ElemOf a where ElemOf :: WitnessFor w a => w -> ElemOf a
deriving instance Show (ElemOf a)
deriving instance Lift (ElemOf a)
instance (Show a, Lift a, Valuable a, Eq a) => IsFunction (ElemOf a) (a, [a]) Bool where
evalFunction (ElemOf _) (y, ys) = y `elem` ys
elemOf :: (Show t, Lift t, Valuable t, Eq t, TokenableTo t a, TokenableTo [t] b, WitnessFor w t) => w -> a -> b -> DepGenM (Token Bool)
elemOf witness a b = runFunction (ElemOf (emptyValue witness)) =<< toTupleToken a b
elemOf witness a b = runFunction (ElemOf witness) =<< toTupleToken a b
elemOfString :: (TokenableTo String a, TokenableTo [String] b) => a -> b -> DepGenM (Token Bool)
elemOfString = elemOf StringType