Copyright	(c) 2017-2018 Herbert Valerio Riedel (c) 20082012 Antoine Latter
License	BSD-style
Maintainer	hvr@gnu.org
Portability	portable
Safe Haskell	Trustworthy
Language	Haskell2010

Data.UUID.Types

Contents

The UUID Type
Nil UUID
Textual Representation
Binary Representation
Integer Representation

Description

This library is useful for comparing, parsing and printing Universally Unique Identifiers (UUID). See RFC 4122 for the specification.

Synopsis

data UUID
nil :: UUID
null :: UUID -> Bool
toString :: UUID -> String
fromString :: String -> Maybe UUID
toText :: UUID -> Text
fromText :: Text -> Maybe UUID
toASCIIBytes :: UUID -> ByteString
fromASCIIBytes :: ByteString -> Maybe UUID
toLazyASCIIBytes :: UUID -> ByteString
fromLazyASCIIBytes :: ByteString -> Maybe UUID
toByteString :: UUID -> ByteString
fromByteString :: ByteString -> Maybe UUID
toWords :: UUID -> (Word32, Word32, Word32, Word32)
fromWords :: Word32 -> Word32 -> Word32 -> Word32 -> UUID
toWords64 :: UUID -> (Word64, Word64)
fromWords64 :: Word64 -> Word64 -> UUID

The `UUID` Type

data UUID Source #

Type representing Universally Unique Identifiers (UUID) as specified in RFC 4122.

Instances

Instances details

Eq UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods (==) :: UUID -> UUID -> Bool # (/=) :: UUID -> UUID -> Bool #
Data UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UUID -> c UUID # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UUID # toConstr :: UUID -> Constr # dataTypeOf :: UUID -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c UUID) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UUID) # gmapT :: (forall b. Data b => b -> b) -> UUID -> UUID # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UUID -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UUID -> r # gmapQ :: (forall d. Data d => d -> u) -> UUID -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> UUID -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> UUID -> m UUID # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UUID -> m UUID # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UUID -> m UUID #
Ord UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods compare :: UUID -> UUID -> Ordering # (<) :: UUID -> UUID -> Bool # (<=) :: UUID -> UUID -> Bool # (>) :: UUID -> UUID -> Bool # (>=) :: UUID -> UUID -> Bool # max :: UUID -> UUID -> UUID # min :: UUID -> UUID -> UUID #
Read UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods readsPrec :: Int -> ReadS UUID # readList :: ReadS [UUID] # readPrec :: ReadPrec UUID # readListPrec :: ReadPrec [UUID] #
Show UUID Source #	Pretty prints a `UUID` (without quotation marks). See also `toString`. `>>>` `show nil`"00000000-0000-0000-0000-000000000000"
Instance details Defined in Data.UUID.Types.Internal Methods showsPrec :: Int -> UUID -> ShowS # show :: UUID -> String # showList :: [UUID] -> ShowS #
Storable UUID Source #	This `Storable` instance uses the memory layout as described in RFC 4122, but in contrast to the `Binary` instance, the fields are stored in host byte order.
Instance details Defined in Data.UUID.Types.Internal Methods sizeOf :: UUID -> Int # alignment :: UUID -> Int # peekElemOff :: Ptr UUID -> Int -> IO UUID # pokeElemOff :: Ptr UUID -> Int -> UUID -> IO () # peekByteOff :: Ptr b -> Int -> IO UUID # pokeByteOff :: Ptr b -> Int -> UUID -> IO () # peek :: Ptr UUID -> IO UUID # poke :: Ptr UUID -> UUID -> IO () #
Binary UUID Source #	This `Binary` instance is compatible with RFC 4122, storing the fields in network order as 16 bytes.
Instance details Defined in Data.UUID.Types.Internal Methods put :: UUID -> Put # get :: Get UUID # putList :: [UUID] -> Put #
NFData UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods rnf :: UUID -> () #
Hashable UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods hashWithSalt :: Int -> UUID -> Int # hash :: UUID -> Int #
Random UUID Source #	This `Random` instance produces insecure version 4 UUIDs as specified in RFC 4122.
Instance details Defined in Data.UUID.Types.Internal Methods randomR :: RandomGen g => (UUID, UUID) -> g -> (UUID, g) # random :: RandomGen g => g -> (UUID, g) # randomRs :: RandomGen g => (UUID, UUID) -> g -> [UUID] # randoms :: RandomGen g => g -> [UUID] #
Uniform UUID Source #
Instance details Defined in Data.UUID.Types.Internal Methods uniformM :: StatefulGen g m => g -> m UUID #

Nil UUID

nil :: UUID Source #

The nil UUID, as defined in RFC 4122. It is a UUID of all zeros. null u iff u == nil.

null :: UUID -> Bool Source #

Returns true if the passed-in UUID is the nil UUID.

Textual Representation

toString :: UUID -> String Source #

Convert a UUID into a hypenated string using lower-case letters. Example:

>>> toString <$> fromString "550e8400-e29b-41d4-a716-446655440000"
Just "550e8400-e29b-41d4-a716-446655440000"

fromString :: String -> Maybe UUID Source #

If the passed in String can be parsed as a UUID, it will be. The hyphens may not be omitted. Example:

>>> fromString "c2cc10e1-57d6-4b6f-9899-38d972112d8c"
Just c2cc10e1-57d6-4b6f-9899-38d972112d8c

Hex digits may be upper or lower-case.

toText :: UUID -> Text Source #

Convert a UUID into a hyphentated string using lower-case letters.

fromText :: Text -> Maybe UUID Source #

If the passed in Text can be parsed as an ASCII representation of a UUID, it will be. The hyphens may not be omitted.

toASCIIBytes :: UUID -> ByteString Source #

Convert a UUID into a hyphentated string using lower-case letters, packed as ASCII bytes into ByteString.

This should be equivalent to toString with pack.

fromASCIIBytes :: ByteString -> Maybe UUID Source #

If the passed in ByteString can be parsed as an ASCII representation of a UUID, it will be. The hyphens may not be omitted.

This should be equivalent to fromString with unpack.

toLazyASCIIBytes :: UUID -> ByteString Source #

Similar to toASCIIBytes except we produce a lazy ByteString.

fromLazyASCIIBytes :: ByteString -> Maybe UUID Source #

Similar to fromASCIIBytes except parses from a lazy ByteString.

Binary Representation

toByteString :: UUID -> ByteString Source #

Encode a UUID into a ByteString in network order.

This uses the same encoding as the Binary instance.

fromByteString :: ByteString -> Maybe UUID Source #

Extract a UUID from a ByteString in network byte order. The argument must be 16 bytes long, otherwise Nothing is returned.

Integer Representation

toWords :: UUID -> (Word32, Word32, Word32, Word32) Source #

Convert a UUID into a sequence of Word32 values. Useful for when you need to serialize a UUID and neither Storable nor Binary are appropriate.

>>> toWords <$> fromString "550e8400-e29b-41d4-a716-446655440000"
Just (1427014656,3801825748,2803254374,1430519808)