Database.InfluxDB.Decode

Documentation

class FromSeries a where

A type that can be converted from a Series.

Minimal complete definition

parseSeries

Methods

parseSeries :: Series -> Parser a

Instances

FromSeries SeriesData

Methods

parseSeries :: Series -> Parser SeriesData

FromSeries Series

Methods

parseSeries :: Series -> Parser 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 Event where
  parseSeriesData = withValues $ \values -> Event
    <$> values .: "user"
    <*> values .: "type"

instance FromValue EventType

Minimal complete definition

parseSeriesData

Methods

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

Instances

FromSeriesData SeriesData

Methods

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

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

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

fromSeriesData_ :: FromSeriesData a => SeriesData -> [a]

Same as fromSeriesData but ignores parse errors and returns only successful data.

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

Helper function to define parseSeriesData from ValueParsers.

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

Retrieve the value associated with the given column. The result is empty if the column is not present or the value cannot be converted to the desired type.

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

Retrieve the value associated with the given column. The result is Nothing if the column is not present or the value cannot be converted to the desired type.

(.!=) :: Parser (Maybe a) -> a -> Parser a

Helper for use in combination with .:? to provide default values for optional columns.

class FromValue a where

A type that can be converted from a Value.

Minimal complete definition

parseValue

Methods

parseValue :: Value -> Parser a

Instances

FromValue Bool

Methods

parseValue :: Value -> Parser Bool

FromValue Double

Methods

parseValue :: Value -> Parser Double

FromValue Int

Methods

parseValue :: Value -> Parser Int

FromValue Int8

Methods

parseValue :: Value -> Parser Int8

FromValue Int16

Methods

parseValue :: Value -> Parser Int16

FromValue Int32

Methods

parseValue :: Value -> Parser Int32

FromValue Int64

Methods

parseValue :: Value -> Parser Int64

FromValue Word8

Methods

parseValue :: Value -> Parser Word8

FromValue Word16

Methods

parseValue :: Value -> Parser Word16

FromValue Word32

Methods

parseValue :: Value -> Parser Word32

FromValue Text

Methods

parseValue :: Value -> Parser Text

FromValue Text

Methods

parseValue :: Value -> Parser Text

FromValue String

Methods

parseValue :: Value -> Parser String

FromValue Value

Methods

parseValue :: Value -> Parser Value

FromValue a => FromValue (Maybe a)

Methods

parseValue :: Value -> Parser (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

Methods

(>>=) :: Parser a -> (a -> Parser b) -> Parser b

(>>) :: Parser a -> Parser b -> Parser b

return :: a -> Parser a

fail :: String -> Parser a

Functor Parser

Methods

fmap :: (a -> b) -> Parser a -> Parser b

(<$) :: a -> Parser b -> Parser a

Applicative Parser

Methods

pure :: a -> Parser a

(<*>) :: Parser (a -> b) -> Parser a -> Parser b

(*>) :: Parser a -> Parser b -> Parser b

(<*) :: Parser a -> Parser b -> Parser a

data ValueParser a

Instances

Monad ValueParser

Methods

(>>=) :: ValueParser a -> (a -> ValueParser b) -> ValueParser b

(>>) :: ValueParser a -> ValueParser b -> ValueParser b

return :: a -> ValueParser a

fail :: String -> ValueParser a

Functor ValueParser

Methods

fmap :: (a -> b) -> ValueParser a -> ValueParser b

(<$) :: a -> ValueParser b -> ValueParser a

Applicative ValueParser

Methods

pure :: a -> ValueParser a

(<*>) :: ValueParser (a -> b) -> ValueParser a -> ValueParser b

(*>) :: ValueParser a -> ValueParser b -> ValueParser b

(<*) :: ValueParser a -> ValueParser b -> ValueParser a

typeMismatch :: String -> Value -> Parser a