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Add Semigroup, Monoid, and HeytingAlgebra instances to Result #101

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Add Semigroup, Monoid, and HeytingAlgebra instances to Result #101

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27 changes: 27 additions & 0 deletions src/Test/QuickCheck.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ import Prelude
import Control.Monad.Rec.Class (Step(..), tailRec)
import Data.Foldable (for_)
import Data.FoldableWithIndex (foldlWithIndex)
import Data.HeytingAlgebra (ff)
import Data.List (List)
import Data.List as List
import Data.Maybe (Maybe(..))
Expand Down Expand Up @@ -223,6 +224,32 @@ instance showResult :: Show Result where
show Success = "Success"
show (Failed msg) = "Failed: " <> msg

instance semigroupResult :: Semigroup Result where
append Success r = r
append (Failed str) _ = Failed str

instance monoidResult :: Monoid Result where
mempty = Success

instance heytingAlgebraResult :: HeytingAlgebra Result where
ff = Failed "ff"

tt = Success

implies (Failed _) _ = Success
implies Success x = x

conj Success x = x
conj x Success = x
conj (Failed x) (Failed y) = Failed (x <> " and " <> y)

disj Success _ = Success
disj _ Success = Success
disj (Failed x) (Failed y) = Failed (x <> " or " <> y)

not Success = ff
not (Failed _) = Success

-- | This operator attaches an error message to a failed test.
-- |
-- | For example:
Expand Down