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Adding useful type-class instances for NonEmpty #689

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Adding useful type-class instances for NonEmpty #689

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18 changes: 18 additions & 0 deletions Data/SBV/Core/Model.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,8 @@ import Data.Char (toLower, isDigit)
import Data.Int (Int8, Int16, Int32, Int64)
import Data.Kind (Type)
import Data.List (genericLength, genericIndex, genericTake, unzip4, unzip5, unzip6, unzip7, intercalate, isPrefixOf)
import Data.List.NonEmpty (NonEmpty(..))
import qualified Data.List.NonEmpty as NE
import Data.Maybe (fromMaybe, mapMaybe)
import Data.String (IsString(..))
import Data.Word (Word8, Word16, Word32, Word64)
Expand Down Expand Up @@ -959,6 +961,13 @@ instance OrdSymbolic a => OrdSymbolic [a] where
_ .< [] = sFalse
(x:xs) .< (y:ys) = x .< y .|| (x .== y .&& xs .< ys)

-- NonEmpty
instance (EqSymbolic a) => EqSymbolic (NonEmpty a) where
(x :| xs) .== (y :| ys) = x .== y .&& xs .== ys

instance (OrdSymbolic a) => OrdSymbolic (NonEmpty a) where
(x :| xs) .< (y :| ys) = x .< y .|| xs .< ys

-- Maybe
instance EqSymbolic a => EqSymbolic (Maybe a) where
Nothing .== Nothing = sTrue
Expand Down Expand Up @@ -2042,6 +2051,15 @@ instance Mergeable a => Mergeable [a] where
"Use the 'SList' type (and Data.SBV.List routines) to model fully symbolic lists."
where (lxs, lys) = (length xs, length ys)

-- NonEmpty
instance Mergeable a => Mergeable (NonEmpty a) where
symbolicMerge f t xs ys
| lxs == lys = NE.zipWith (symbolicMerge f t) xs ys
| True = cannotMerge "lists"
("Branches produce different sizes: " ++ show lxs ++ " vs " ++ show lys ++ ". Must have the same length.")
"Use the 'SList' type (and Data.SBV.List routines) to model fully symbolic lists."
where (lxs, lys) = (length xs, length ys)

-- ZipList
instance Mergeable a => Mergeable (ZipList a) where
symbolicMerge force test (ZipList xs) (ZipList ys)
Expand Down
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