Frames-0.7.1: Data frames For working with tabular data files
Safe HaskellNone



Support for representing so-called categorical variables: a (usually small) finite set of textual values. We map these onto regular Haskell data types and offer help to generate useful type class instances for such types.



newtype Categorical (n :: Nat) Source #

A categorical variable can take on one of a finite number of textual names. Any value of type Categorical n has no more than n variants.





Instances details
Eq (Categorical n) Source # 
Instance details

Defined in Frames.Categorical

Show (Categorical n) Source # 
Instance details

Defined in Frames.Categorical

KnownNat n => Parseable (Categorical n) Source # 
Instance details

Defined in Frames.Categorical

cap :: String -> String Source #

Ensure the first character of a String is uppercase.

unboxDecls :: String -> Int -> DecsQ Source #

Helper for working with derivingUnbox. Takes the name of the type and the number of variants in the sum type in order to determine a compact representation.

declareCategorical :: String -> Maybe String -> [String] -> Q [Dec] Source #

Generate a splice with data type declaration and associated instances for type suitable for representing a categorical variable. This is a type that maps between a finite set of textual names and Haskell data constructors. Usage: declareCategorical typeName optionalConPrefix variantNames will produce a data type with name typeName and data constructors whose names are a concatenation of optionalConPrefix and each element of variantNames.