enum-utf8

An experimental toolkit for rendering enumerated types into Utf8 from the render-utf8 package) and parsing them back again with the provided Utf8Parsable type class. It is based on the render-utf8 and enum-text packages.

To get the Buildable and TextParsable instances for an enumerated data type use the following pattern:

import Text.Enum.Utf8
import Text.Utf8
data Foo = FOO_bar | FOO_bar_baz
  deriving (Bounded,Enum,Eq,Ord,Show)
instance EnumUtf8     Foo
instance Renderable   Foo where render    = renderEnumUtf8
instance Utf8Parsable Foo where parseUtf8 = parseEnumUtf8
main :: IO ()
main = mapM_ (cvtLn . render) [minBound..maxBound::Foo]

This will use the default configuration for generating the text of each enumeration from the derived show text, namely:

• removing the prefix upto and including the first underscore (_);
• converting each subsequent underscore (_) into a dash (-).

See the Haddocks for details on how to override this default configuration for any given enumeration type.

Functions for generating and parsing UTF-8 encoded ByteStrings (suitable for cassava), as are Hashable functions.