Data.NonEmpty

Documentation

data T f a

The type T can be used for many kinds of list-like structures with restrictions on the size.

• T [] a is a lazy list containing at least one element.
• T (T []) a is a lazy list containing at least two elements.
• T Vector a is a vector with at least one element. You may also use unboxed vectors but the first element will be stored in a box and you will not be able to use many functions from this module.
• T Maybe a is a list that contains one or two elements.
• Maybe is isomorphic to Optional Empty.
• T Empty a is a list that contains exactly one element.
• T (T Empty) a is a list that contains exactly two elements.
• Optional (T Empty) a is a list that contains zero or two elements.
• You can create a list type for every finite set of allowed list length by nesting Optional and NonEmpty constructors. If list length n is allowed, then place Optional at depth n, if it is disallowed then place NonEmpty. The maximum length is marked by Empty.

Constructors

Cons

Fields

• head :: a
• tail :: f a

Instances

(Monad f, Empty f, Cons f, Append f) => Monad (T f)

Defined in Data.NonEmptyPrivate

Methods

(>>=) :: T f a -> (a -> T f b) -> T f b

(>>) :: T f a -> T f b -> T f b

return :: a -> T f a

fail :: String -> T f a

Functor f => Functor (T f)

Defined in Data.NonEmptyPrivate

Methods

fmap :: (a -> b) -> T f a -> T f b

(<$) :: a -> T f b -> T f a

(Applicative f, Empty f, Cons f, Append f) => Applicative (T f)

Defined in Data.NonEmptyPrivate

Methods

pure :: a -> T f a

(<*>) :: T f (a -> b) -> T f a -> T f b

liftA2 :: (a -> b -> c) -> T f a -> T f b -> T f c

(*>) :: T f a -> T f b -> T f b

(<*) :: T f a -> T f b -> T f a

Foldable f => Foldable (T f)

Defined in Data.NonEmptyPrivate

Methods

fold :: Monoid m => T f m -> m

foldMap :: Monoid m => (a -> m) -> T f a -> m

foldr :: (a -> b -> b) -> b -> T f a -> b

foldr' :: (a -> b -> b) -> b -> T f a -> b

foldl :: (b -> a -> b) -> b -> T f a -> b

foldl' :: (b -> a -> b) -> b -> T f a -> b

foldr1 :: (a -> a -> a) -> T f a -> a

foldl1 :: (a -> a -> a) -> T f a -> a

toList :: T f a -> [a]

null :: T f a -> Bool

length :: T f a -> Int

elem :: Eq a => a -> T f a -> Bool

maximum :: Ord a => T f a -> a

minimum :: Ord a => T f a -> a

sum :: Num a => T f a -> a

product :: Num a => T f a -> a

Traversable f => Traversable (T f)

Defined in Data.NonEmptyPrivate

Methods

traverse :: Applicative f0 => (a -> f0 b) -> T f a -> f0 (T f b)

sequenceA :: Applicative f0 => T f (f0 a) -> f0 (T f a)

mapM :: Monad m => (a -> m b) -> T f a -> m (T f b)

sequence :: Monad m => T f (m a) -> m (T f a)

NFData f => NFData (T f)

Defined in Data.NonEmptyPrivate

Methods

rnf :: NFData a => T f a -> ()

Gen f => Gen (T f)

Defined in Data.NonEmptyPrivate

Methods

genOf :: Gen a -> Gen (T f a)

Arbitrary f => Arbitrary (T f)

Defined in Data.NonEmptyPrivate

Methods

arbitrary :: Arbitrary a => Gen (T f a)

shrink :: Arbitrary a => T f a -> [T f a]

Show f => Show (T f)

Defined in Data.NonEmptyPrivate

Methods

showsPrec :: Show a => Int -> T f a -> ShowS

(Traversable f, Reverse f) => Reverse (T f)

Defined in Data.NonEmptyPrivate

Methods

reverse :: T f a -> T f a

(SortBy f, InsertBy f) => SortBy (T f)

Defined in Data.NonEmptyPrivate

Methods

sortBy :: (a -> a -> Ordering) -> T f a -> T f a

(Sort f, InsertBy f) => Sort (T f)

If you nest too many non-empty lists then the efficient merge-sort (linear-logarithmic runtime) will degenerate to an inefficient insert-sort (quadratic runtime).

Defined in Data.NonEmptyPrivate

Methods

sort :: Ord a => T f a -> T f a

Iterate f => Iterate (T f)

Defined in Data.NonEmptyPrivate

Methods

iterate :: (a -> a) -> a -> T f a

Repeat f => Repeat (T f)

Defined in Data.NonEmptyPrivate

Methods

repeat :: a -> T f a

Zip f => Zip (T f)

Defined in Data.NonEmptyPrivate

Methods

zipWith :: (a -> b -> c) -> T f a -> T f b -> T f c

(Cons f, Append f) => Append (T f)

Defined in Data.NonEmptyPrivate

Methods

append :: T f a -> T f a -> T f a

Empty f => Singleton (T f)

Defined in Data.NonEmptyPrivate

Methods

singleton :: a -> T f a

ViewL f => ViewL (T f)

Caution: viewL (NonEmpty.Cons x []) = Nothing because the tail is empty, and thus cannot be NonEmpty!

This instance mainly exist to allow cascaded applications of fetch.

Defined in Data.NonEmptyPrivate

Methods

viewL :: T f a -> Maybe (a, T f a)

Snoc f => Snoc (T f)

Defined in Data.NonEmptyPrivate

Methods

snoc :: T f a -> a -> T f a

Cons f => Cons (T f)

Defined in Data.NonEmptyPrivate

Methods

cons :: a -> T f a -> T f a

InsertBy f => InsertBy (T f)

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> T f a -> T (T f) a

Insert f => Insert (T f)

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> T f a -> T (T f) a

Choose f => Choose (T f)

Defined in Data.NonEmpty.Mixed

Methods

choose :: [a] -> [T f a]

(Eq a, Eq (f a)) => Eq (T f a)

Defined in Data.NonEmptyPrivate

Methods

(==) :: T f a -> T f a -> Bool

(/=) :: T f a -> T f a -> Bool

(Ord a, Ord (f a)) => Ord (T f a)

Defined in Data.NonEmptyPrivate

Methods

compare :: T f a -> T f a -> Ordering

(<) :: T f a -> T f a -> Bool

(<=) :: T f a -> T f a -> Bool

(>) :: T f a -> T f a -> Bool

(>=) :: T f a -> T f a -> Bool

max :: T f a -> T f a -> T f a

min :: T f a -> T f a -> T f a

(Show f, Show a) => Show (T f a)

Defined in Data.NonEmptyPrivate

Methods

showsPrec :: Int -> T f a -> ShowS

show :: T f a -> String

showList :: [T f a] -> ShowS

(Arbitrary a, Arbitrary f) => Arbitrary (T f a)

Defined in Data.NonEmptyPrivate

Methods

arbitrary :: Gen (T f a)

shrink :: T f a -> [T f a]

(NFData f, NFData a) => NFData (T f a)

Defined in Data.NonEmptyPrivate

Methods

rnf :: T f a -> ()

(!:) :: a -> f a -> T f a infixr 5

force :: T f a -> T f a

Force immediate generation of Cons.

apply :: (Applicative f, Cons f, Append f) => T f (a -> b) -> T f a -> T f b

Implementation of <*> without the Empty constraint that is needed for pure.

bind :: (Monad f, Cons f, Append f) => T f a -> (a -> T f b) -> T f b

Implementation of >>= without the Empty constraint that is needed for return.

toList :: Foldable f => T f a -> [a]

flatten :: Cons f => T f a -> f a

fetch :: ViewL f => f a -> Maybe (T f a)

cons :: a -> f a -> T f a

Synonym for Cons. For symmetry to snoc.

snoc :: Traversable f => f a -> a -> T f a

singleton :: Empty f => a -> T f a

reverse :: (Traversable f, Reverse f) => T f a -> T f a

mapHead :: (a -> a) -> T f a -> T f a

mapTail :: (f a -> g a) -> T f a -> T g a

viewL :: T f a -> (a, f a)

viewR :: Traversable f => T f a -> (f a, a)

init :: Traversable f => T f a -> f a

last :: Foldable f => T f a -> a

foldl1 :: Foldable f => (a -> a -> a) -> T f a -> a

foldl1Map :: Foldable f => (b -> b -> b) -> (a -> b) -> T f a -> b

It holds:

foldl1Map f g = foldl1 f . fmap g

but foldl1Map does not need a Functor instance.

foldBalanced :: (a -> a -> a) -> T [] a -> a

Fold a non-empty list in a balanced way. Balanced means that each element has approximately the same depth in the operator tree. Approximately the same depth means that the difference between maximum and minimum depth is at most 1. The accumulation operation must be associative and commutative in order to get the same result as foldl1 or foldr1.

foldBalancedStrict :: (a -> a -> a) -> T [] a -> a

maximum :: (Ord a, Foldable f) => T f a -> a

maximum is a total function

maximumBy :: Foldable f => (a -> a -> Ordering) -> T f a -> a

maximumBy is a total function

maximumKey :: (Ord b, Foldable f) => (a -> b) -> T f a -> a

maximumKey is a total function

minimum :: (Ord a, Foldable f) => T f a -> a

minimum is a total function

minimumBy :: Foldable f => (a -> a -> Ordering) -> T f a -> a

minimumBy is a total function

minimumKey :: (Ord b, Foldable f) => (a -> b) -> T f a -> a

minimumKey is a total function

sum :: (Num a, Foldable f) => T f a -> a

sum does not need a zero for initialization

product :: (Num a, Foldable f) => T f a -> a

product does not need a one for initialization

append :: (Append f, Traversable f) => T f a -> T f a -> T (T f) a infixr 5

appendLeft :: (Append f, Traversable f) => f a -> T f a -> T f a infixr 5

appendRight :: Append f => T f a -> f a -> T f a infixr 5

cycle :: (Cons f, Append f) => T f a -> T f a

generic variants: cycle or better Semigroup.cycle

zipWith :: Zip f => (a -> b -> c) -> T f a -> T f b -> T f c

mapAdjacent :: Traversable f => (a -> a -> b) -> T f a -> f b

class Insert f where

Methods

insert :: Ord a => a -> f a -> T f a

Insert an element into an ordered list while preserving the order.

Instances

Insert []

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> [a] -> T [] a

Insert Maybe

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> Maybe a -> T Maybe a

Insert Seq

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> Seq a -> T Seq a

Insert T

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> T a -> T0 T a

Insert f => Insert (T f)

Defined in Data.NonEmptyPrivate

Methods

insert :: Ord a => a -> T f a -> T (T f) a

Insert f => Insert (T f)

Defined in Data.Optional

Methods

insert :: Ord a => a -> T f a -> T0 (T f) a

insertDefault :: (Ord a, InsertBy f, SortBy f) => a -> f a -> T f a

Default implementation for insert based on insertBy.

class Insert f => InsertBy f where

Methods

insertBy :: (a -> a -> Ordering) -> a -> f a -> T f a

Instances

InsertBy []

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> [a] -> T [] a

InsertBy Maybe

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> Maybe a -> T Maybe a

InsertBy Seq

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> Seq a -> T Seq a

InsertBy T

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> T a -> T0 T a

InsertBy f => InsertBy (T f)

Defined in Data.NonEmptyPrivate

Methods

insertBy :: (a -> a -> Ordering) -> a -> T f a -> T (T f) a

InsertBy f => InsertBy (T f)

Defined in Data.Optional

Methods

insertBy :: (a -> a -> Ordering) -> a -> T f a -> T0 (T f) a

scanl :: Traversable f => (b -> a -> b) -> b -> f a -> T f b

scanr :: Traversable f => (a -> b -> b) -> b -> f a -> T f b

tails :: (Traversable f, Cons g, Empty g) => f a -> T f (g a)

inits :: (Traversable f, Snoc g, Empty g) => f a -> T f (g a)

Only advised for structures with efficient appending of single elements like Sequence. Alternatively you may consider initsRev.

initsRev :: (Traversable f, Cons g, Empty g, Reverse g) => f a -> T f (g a)

removeEach :: Traversable f => T f a -> T f (a, f a)