testing-feat-0.4.0.3: Functional Enumeration of Algebraic Types

Safe HaskellNone
LanguageHaskell98

Test.Feat.Modifiers

Contents

Description

Modifiers for types, i.e. newtype wrappers where the values satisfy some constraint (non-empty, positive etc.). Suggestions on useful types are appreciated.

To apply the modifiers types you can use the record label. For instance:

 data C a = C [a] [a] deriving Typeable
 instance Enumerable a => Enumerable (C a) where
    enumerate = unary $ funcurry $ 
      \xs ys -> C (nonEmpty xs) (nonEmpty ys)

Alternatively you can put everything in pattern postition:

 instance Enumerable a => Enumerable (C a) where
    enumerate = unary $ funcurry $ 
      \(Free (NonEmpty xs,NonEmpty ys)) -> C xs ys)

The first approach has the advantage of being usable with a point free style: \xs -> C (nonEmpty xs) . nonEmpty .

Synopsis

List modifiers

newtype NonEmpty a Source

A type of non empty lists.

Constructors

NonEmpty 

Fields

nonEmpty :: [a]
 

mkNonEmpty :: (a, [a]) -> NonEmpty a Source

Numeric modifiers

class (Typeable a, Integral a) => Infinite a Source

A class of infinite precision integral types. Integer is the principal class member.

newtype Nat a Source

A type of (infinite precision) natural numbers such that nat a >= 0 .

Constructors

Nat 

Fields

nat :: a
 

Instances

Eq a => Eq (Nat a) Source 
Ord a => Ord (Nat a) Source 
Show a => Show (Nat a) Source 
Infinite a => Enumerable (Nat a) Source 

newtype NonZero a Source

A type of (infinite precision) non-zero integers such that nonZero a /= 0 .

Constructors

NonZero 

Fields

nonZero :: a
 

Instances

Character and string modifiers

newtype Unicode Source

Any unicode character.

Constructors

Unicode 

Fields

unicode :: Char
 

unicodes :: [Unicode] -> String Source

Smart constructor for unicode strings.

newtype Printable Source

Printable ASCII characters

Constructors

Printable 

Fields

printable :: Char
 

printables :: [Printable] -> String Source

Smart constructor for printable ASCII strings