Web.Growler.Parsable

Documentation

class Parsable a where

Minimum implemention: parseParam

Minimal complete definition

parseParam

Methods

parseParam :: ByteString -> Either ByteString a

Take a ByteString value and parse it as a, or fail with a message.

parseParamList :: ByteString -> Either ByteString [a]

Default implementation parses comma-delimited lists.

parseParamList t = mapM parseParam (BS.split ',' t)

Instances

Parsable Bool

Parsable Char

Overrides default parseParamList to parse String.

Parsable Double

Parsable Float

Parsable Int

Parsable Integer

Parsable ()

Checks if parameter is present and is null-valued, not a literal '()'. If the URI requested is: '/foo?bar=()&baz' then baz will parse as (), where bar will not.

Parsable ByteString

Parsable Text

Parsable Text

Parsable a => Parsable [a]

readEither :: Read a => ByteString -> Either ByteString a

Useful for creating Parsable instances for things that already implement Read. Ex:

instance Parsable Int where parseParam = readEither