Database.InfluxDB.Decode

Documentation

class FromSeries a where

A type that can be converted from a Series.

Methods

parseSeries :: Series -> Parser a

Instances

FromSeries SeriesData

FromSeries Series

fromSeries :: FromSeries a => Series -> Either String a

Converte a value from a Series, failing if the types do not match.

class FromSeriesData a where

A type that can be converted from a SeriesData. A typical implementation is as follows.

 import Control.Applicative ((<$>), (<*>))
 import qualified Data.Vector as V

 data Event = Event Text EventType
 data EventType = Login | Logout

 instance FromSeriesData where
   parseSeriesData = withValues $ \values -> Event
     <$> values .: "user"
     <*> values .: "type"

 instance FromValue EventType

Methods

parseSeriesData :: Vector Column -> Vector Value -> Parser a

Instances

FromSeriesData SeriesData

fromSeriesData :: FromSeriesData a => SeriesData -> Either String [a]

Converte a value from a SeriesData, failing if the types do not match.

withValues :: (Vector Value -> ValueParser a) -> Vector Column -> Vector Value -> Parser a

(.:) :: FromValue a => Vector Value -> Column -> ValueParser a

class FromValue a where

A type that can be converted from a Value.

Methods

parseValue :: Value -> Parser a

Instances

FromValue Bool

FromValue Double

FromValue Int

FromValue Value

FromValue a => FromValue (Maybe a)

fromValue :: FromValue a => Value -> Either String a

Converte a value from a Value, failing if the types do not match.

data Parser a

Instances

Monad Parser

Functor Parser

Applicative Parser

data ValueParser a

Instances

Monad ValueParser

Functor ValueParser

Applicative ValueParser

typeMismatch :: String -> Value -> Parser a