| Safe Haskell | Safe |
|---|---|
| Language | Haskell2010 |
Data.Predicate
- type Predicate a f t = a -> Result f t
- constant :: t -> Predicate a f t
- failure :: f -> Predicate a f t
- true :: Predicate a f ()
- false :: Predicate a () t
- and :: Predicate a f t -> Predicate a f t' -> Predicate a f (t ::: t')
- or :: Predicate a f t -> Predicate a f t -> Predicate a f t
- orElse :: Predicate a f t -> Predicate a f t' -> Predicate a f (Either t t')
- (.&.) :: Predicate a f t -> Predicate a f t' -> Predicate a f (t ::: t')
- (.|.) :: Predicate a f t -> Predicate a f t -> Predicate a f t
- (|||) :: Predicate a f t -> Predicate a f t' -> Predicate a f (Either t t')
- exec :: Predicate a f t -> a -> (f -> b) -> (t -> b) -> b
- data Result f t
- result :: (f -> a) -> (Double -> t -> a) -> Result f t -> a
- fromEither :: Either f t -> Result f t
- toEither :: Result f t -> Either f t
- newtype ResultT f m t = ResultT {
- runResultT :: m (Result f t)
- resultT :: Monad m => (f -> m a) -> (Double -> t -> m a) -> ResultT f m t -> m a
- resultT' :: Monad m => (f -> m a) -> (t -> m a) -> ResultT f m t -> m a
- mapResultT :: (m (Result f t) -> n (Result f' t')) -> ResultT f m t -> ResultT f' n t'
- hoistResult :: Monad m => Result f t -> ResultT f m t
- okay :: Monad m => Double -> t -> ResultT f m t
- throwF :: Monad m => f -> ResultT f m t
- data a ::: b = a ::: b
- (#) :: a -> (a -> b) -> b
- hd :: (a ::: b) -> a
- tl :: (a ::: b) -> b
- _1 :: (a ::: b) -> a
- _2 :: (a ::: (b ::: c)) -> b
- _3 :: (a ::: (b ::: (c ::: d))) -> c
- _4 :: (a ::: (b ::: (c ::: (d ::: e)))) -> d
- _5 :: (a ::: (b ::: (c ::: (d ::: (e ::: f))))) -> e
- _6 :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: g)))))) -> f
- _7 :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: (g ::: h))))))) -> g
- _8 :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: (g ::: (h ::: i)))))))) -> h
- _9 :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: (g ::: (h ::: (i ::: j))))))))) -> i
- _1' :: (a ::: b) -> a
- _2' :: (a ::: b) -> b
- _3' :: (a ::: (b ::: c)) -> c
- _4' :: (a ::: (b ::: (c ::: d))) -> d
- _5' :: (a ::: (b ::: (c ::: (d ::: e)))) -> e
- _6' :: (a ::: (b ::: (c ::: (d ::: (e ::: f))))) -> f
- _7' :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: g)))))) -> g
- _8' :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: (g ::: h))))))) -> h
- _9' :: (a ::: (b ::: (c ::: (d ::: (e ::: (f ::: (g ::: (h ::: i)))))))) -> i
Predicate
constant :: t -> Predicate a f t Source
A predicate which always returns Okay with the given
value as metadata.
failure :: f -> Predicate a f t Source
A predicate which always returns Fail with the given
value as metadata.
and :: Predicate a f t -> Predicate a f t' -> Predicate a f (t ::: t') Source
A predicate corresponding to the logical AND connective of two predicate.
or :: Predicate a f t -> Predicate a f t -> Predicate a f t Source
A predicate corresponding to the logical
OR connective of two predicates. It requires the
metadata of each Okay branch to be of the same type.
If both arguments evaluate to Okay the one with the
smaller "delta" will be preferred, or--if equal--the
left-hand argument.
orElse :: Predicate a f t -> Predicate a f t' -> Predicate a f (Either t t') Source
A predicate corresponding to the logical
OR connective of two predicates. The metadata of
each Okay branch can be of different types.
If both arguments evaluate to Okay the one with the
smaller "delta" will be preferred, or--if equal--the
left-hand argument.
(.&.) :: Predicate a f t -> Predicate a f t' -> Predicate a f (t ::: t') infixr 3 Source
Alias of and.
(|||) :: Predicate a f t -> Predicate a f t' -> Predicate a f (Either t t') infixr 2 Source
Alias of orElse.
Result
A Bool-like type where each branch--Fail and Okay--carries
some metadata.
fromEither :: Either f t -> Result f t Source
Constructors
| ResultT | |
Fields
| |
hoistResult :: Monad m => Result f t -> ResultT f m t Source
Product
A data-type for combining results of predicate evaluations.
Constructors
| a ::: b infixr 5 |