A newtype wrapper for UTCTime that uses the same non-standard serialization format as Microsoft .NET, whose System.DateTime type is by default serialized to JSON as in the following example:

 /Date(1302547608878)/

The number represents milliseconds since the Unix epoch.

Constructors

DotNetTime
Fields fromDotNetTime :: UTCTime

Instances

Eq DotNetTime
Ord DotNetTime
Read DotNetTime
Show DotNetTime
Typeable DotNetTime
FormatTime DotNetTime
FromJSON DotNetTime
ToJSON DotNetTime

typeMismatch Source

Arguments

:: String	The name of the type you are trying to parse.
-> Value	The actual value encountered.
-> Parser a

Fail parsing due to a type mismatch, with a descriptive message.

Type conversion

data Parser a Source

A continuation-based parser type.

Instances

Monad Parser
Functor Parser
MonadPlus Parser
Applicative Parser
Alternative Parser
Monoid (Parser a)

data Result a Source

The result of running a Parser.

Constructors

Error String
Success a

Instances

Monad Result
Functor Result
Typeable1 Result
MonadPlus Result
Applicative Result
Alternative Result
Eq a => Eq (Result a)
Show a => Show (Result a)
Monoid (Result a)
NFData a => NFData (Result a)

class FromJSON a whereSource

A type that can be converted from JSON, with the possibility of failure.

When writing an instance, use mzero or fail to make a conversion fail, e.g. if an Object is missing a required key, or the value is of the wrong type.

An example type and instance:

data Coord { x :: Double, y :: Double }

instance FromJSON Coord where
   parseJSON (Object v) = Coord <$>
                         v .: "x" <*>
                         v .: "y"

-- A non-Object value is of the wrong type, so use mzero to fail.
   parseJSON _          = mzero

Methods

parseJSON :: Value -> Parser aSource

Instances

FromJSON Bool
FromJSON Char
FromJSON Double
FromJSON Float
FromJSON Int
FromJSON Int8
FromJSON Int16
FromJSON Int32
FromJSON Int64
FromJSON Integer
FromJSON Word
FromJSON Word8
FromJSON Word16
FromJSON Word32
FromJSON Word64
FromJSON ()
FromJSON ByteString
FromJSON ByteString
FromJSON Number
FromJSON Text
FromJSON Text
FromJSON IntSet
FromJSON UTCTime
FromJSON DotNetTime
FromJSON Value
FromJSON [Char]
FromJSON a => FromJSON [a]
FromJSON (Ratio Integer)
FromJSON a => FromJSON (Maybe a)
FromJSON a => FromJSON (Dual a)
FromJSON a => FromJSON (First a)
FromJSON a => FromJSON (Last a)
(Ord a, FromJSON a) => FromJSON (Set a)
FromJSON a => FromJSON (Vector a)
(FromJSON a, FromJSON b) => FromJSON (Either a b)
(FromJSON a, FromJSON b) => FromJSON (a, b)
FromJSON v => FromJSON (Map String v)
FromJSON v => FromJSON (Map ByteString v)
FromJSON v => FromJSON (Map ByteString v)
FromJSON v => FromJSON (Map Text v)
FromJSON v => FromJSON (Map Text v)
FromJSON v => FromJSON (HashMap String v)
FromJSON v => FromJSON (HashMap ByteString v)
FromJSON v => FromJSON (HashMap ByteString v)
FromJSON v => FromJSON (HashMap Text v)
FromJSON v => FromJSON (HashMap Text v)
(FromJSON a, FromJSON b, FromJSON c) => FromJSON (a, b, c)

fromJSON :: FromJSON a => Value -> Result aSource

Convert a value from JSON, failing if the types do not match.

parse :: (a -> Parser b) -> a -> Result bSource

Run a Parser.

parseEither :: (a -> Parser b) -> a -> Either String bSource

Run a Parser with an Either result type.

parseMaybe :: (a -> Parser b) -> a -> Maybe bSource

Run a Parser with a Maybe result type.

class ToJSON a whereSource

A type that can be converted to JSON.

An example type and instance:

data Coord { x :: Double, y :: Double }

instance ToJSON Coord where
   toJSON (Coord x y) = object ["x" .= x, "y" .= y]

Methods

toJSON :: a -> Value Source

Instances

ToJSON Bool
ToJSON Char
ToJSON Double
ToJSON Float
ToJSON Int
ToJSON Int8
ToJSON Int16
ToJSON Int32
ToJSON Int64
ToJSON Integer
ToJSON Word
ToJSON Word8
ToJSON Word16
ToJSON Word32
ToJSON Word64
ToJSON ()
ToJSON ByteString
ToJSON ByteString
ToJSON Number
ToJSON Text
ToJSON Text
ToJSON IntSet
ToJSON UTCTime
ToJSON DotNetTime
ToJSON Value
ToJSON [Char]
ToJSON a => ToJSON [a]
ToJSON (Ratio Integer)
ToJSON a => ToJSON (Maybe a)
ToJSON a => ToJSON (Dual a)
ToJSON a => ToJSON (First a)
ToJSON a => ToJSON (Last a)
ToJSON a => ToJSON (Set a)
ToJSON a => ToJSON (Vector a)
(ToJSON a, ToJSON b) => ToJSON (Either a b)
(ToJSON a, ToJSON b) => ToJSON (a, b)
ToJSON v => ToJSON (Map String v)
ToJSON v => ToJSON (Map ByteString v)
ToJSON v => ToJSON (Map ByteString v)
ToJSON v => ToJSON (Map Text v)
ToJSON v => ToJSON (Map Text v)
ToJSON v => ToJSON (HashMap String v)
ToJSON v => ToJSON (HashMap ByteString v)
ToJSON v => ToJSON (HashMap ByteString v)
ToJSON v => ToJSON (HashMap Text v)
ToJSON v => ToJSON (HashMap Text v)
(ToJSON a, ToJSON b, ToJSON c) => ToJSON (a, b, c)

Constructors and accessors

(.=) :: ToJSON a => Text -> a -> Pair Source

Construct a Pair from a key and a value.

(.:) :: FromJSON a => Object -> Text -> Parser aSource

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

This accessor is appropriate if the key and value must be present in an object for it to be valid. If the key and value are optional, use '(.:?)' instead.

(.:?) :: FromJSON a => Object -> Text -> Parser (Maybe a)Source

Retrieve the value associated with the given key of an Object. The result is Nothing if the key is not present, or empty if the value cannot be converted to the desired type.

This accessor is most useful if the key and value can be absent from an object without affecting its validity. If the key and value are mandatory, use '(.:)' instead.

object :: [Pair] -> Value Source

Create a Value from a list of name/value Pairs. If duplicate keys arise, earlier keys and their associated values win.