Codec.CBOR.Decoding

High level API for decoding values that were encoded with the Codec.CBOR.Encoding module, using a Monad based interface.

Decode primitive operations

data Decoder s a

A continuation-based decoder, used for decoding values that were previously encoded using the Codec.CBOR.Encoding module. As Decoder has a Monad instance, you can easily write Decoders monadically for building your deserialisation logic.

Since: 0.2.0.0

Instances

Monad (Decoder s)

Since: 0.2.0.0

Methods

(>>=) :: Decoder s a -> (a -> Decoder s b) -> Decoder s b

(>>) :: Decoder s a -> Decoder s b -> Decoder s b

return :: a -> Decoder s a

fail :: String -> Decoder s a

Functor (Decoder s)

Since: 0.2.0.0

Methods

fmap :: (a -> b) -> Decoder s a -> Decoder s b

(<$) :: a -> Decoder s b -> Decoder s a

MonadFail (Decoder s)

Since: 0.2.0.0

Methods

fail :: String -> Decoder s a

Applicative (Decoder s)

Since: 0.2.0.0

Methods

pure :: a -> Decoder s a

(<*>) :: Decoder s (a -> b) -> Decoder s a -> Decoder s b

liftA2 :: (a -> b -> c) -> Decoder s a -> Decoder s b -> Decoder s c

(*>) :: Decoder s a -> Decoder s b -> Decoder s b

(<*) :: Decoder s a -> Decoder s b -> Decoder s a

data DecodeAction s a

An action, representing a step for a decoder to taken and a continuation to invoke with the expected value.

Since: 0.2.0.0

Constructors

ConsumeWord (Word# -> ST s (DecodeAction s a))

ConsumeWord8 (Word# -> ST s (DecodeAction s a))

ConsumeWord16 (Word# -> ST s (DecodeAction s a))

ConsumeWord32 (Word# -> ST s (DecodeAction s a))

ConsumeNegWord (Word# -> ST s (DecodeAction s a))

ConsumeInt (Int# -> ST s (DecodeAction s a))

ConsumeInt8 (Int# -> ST s (DecodeAction s a))

ConsumeInt16 (Int# -> ST s (DecodeAction s a))

ConsumeInt32 (Int# -> ST s (DecodeAction s a))

ConsumeListLen (Int# -> ST s (DecodeAction s a))

ConsumeMapLen (Int# -> ST s (DecodeAction s a))

ConsumeTag (Word# -> ST s (DecodeAction s a))

ConsumeInteger (Integer -> ST s (DecodeAction s a))

ConsumeFloat (Float# -> ST s (DecodeAction s a))

ConsumeDouble (Double# -> ST s (DecodeAction s a))

ConsumeBytes (ByteString -> ST s (DecodeAction s a))

ConsumeString (Text -> ST s (DecodeAction s a))

ConsumeBool (Bool -> ST s (DecodeAction s a))

ConsumeSimple (Word# -> ST s (DecodeAction s a))

ConsumeBytesIndef (ST s (DecodeAction s a))

ConsumeStringIndef (ST s (DecodeAction s a))

ConsumeListLenIndef (ST s (DecodeAction s a))

ConsumeMapLenIndef (ST s (DecodeAction s a))

ConsumeNull (ST s (DecodeAction s a))

ConsumeListLenOrIndef (Int# -> ST s (DecodeAction s a))

ConsumeMapLenOrIndef (Int# -> ST s (DecodeAction s a))

ConsumeBreakOr (Bool -> ST s (DecodeAction s a))

PeekTokenType (TokenType -> ST s (DecodeAction s a))

PeekAvailable (Int# -> ST s (DecodeAction s a))

Fail String

Done a

liftST :: ST s a -> Decoder s a

getDecodeAction :: Decoder s a -> ST s (DecodeAction s a)

Given a Decoder, give us the DecodeAction

Since: 0.2.0.0

Read input tokens

decodeWord :: Decoder s Word

Decode a Word.

Since: 0.2.0.0

decodeWord8 :: Decoder s Word8

Decode a Word8.

Since: 0.2.0.0

decodeWord16 :: Decoder s Word16

Decode a Word16.

Since: 0.2.0.0

decodeWord32 :: Decoder s Word32

Decode a Word32.

Since: 0.2.0.0

decodeWord64 :: Decoder s Word64

Decode a Word64.

Since: 0.2.0.0

decodeNegWord :: Decoder s Word

Decode a negative Word.

Since: 0.2.0.0

decodeNegWord64 :: Decoder s Word64

Decode a negative Word64.

Since: 0.2.0.0

decodeInt :: Decoder s Int

Decode an Int.

Since: 0.2.0.0

decodeInt8 :: Decoder s Int8

Decode an Int8.

Since: 0.2.0.0

decodeInt16 :: Decoder s Int16

Decode an Int16.

Since: 0.2.0.0

decodeInt32 :: Decoder s Int32

Decode an Int32.

Since: 0.2.0.0

decodeInt64 :: Decoder s Int64

Decode an Int64.

Since: 0.2.0.0

decodeInteger :: Decoder s Integer

Decode an Integer.

Since: 0.2.0.0

decodeFloat :: Decoder s Float

Decode a Float.

Since: 0.2.0.0

decodeDouble :: Decoder s Double

Decode a Double.

Since: 0.2.0.0

decodeBytes :: Decoder s ByteString

Decode a string of bytes as a ByteString.

Since: 0.2.0.0

decodeBytesIndef :: Decoder s ()

Decode a token marking the beginning of an indefinite length set of bytes.

Since: 0.2.0.0

decodeString :: Decoder s Text

Decode a textual string as a piece of Text.

Since: 0.2.0.0

decodeStringIndef :: Decoder s ()

Decode a token marking the beginning of an indefinite length string.

Since: 0.2.0.0

decodeListLen :: Decoder s Int

Decode the length of a list.

Since: 0.2.0.0

decodeListLenIndef :: Decoder s ()

Decode a token marking the beginning of a list of indefinite length.

Since: 0.2.0.0

decodeMapLen :: Decoder s Int

Decode the length of a map.

Since: 0.2.0.0

decodeMapLenIndef :: Decoder s ()

Decode a token marking the beginning of a map of indefinite length.

Since: 0.2.0.0

decodeTag :: Decoder s Word

Decode an arbitrary tag and return it as a Word.

Since: 0.2.0.0

decodeTag64 :: Decoder s Word64

Decode an arbitrary 64-bit tag and return it as a Word64.

Since: 0.2.0.0

decodeBool :: Decoder s Bool

Decode a bool.

Since: 0.2.0.0

decodeNull :: Decoder s ()

Decode a nullary value, and return a unit value.

Since: 0.2.0.0

decodeSimple :: Decoder s Word8

Decode a simple CBOR value and give back a Word8. You probably don't ever need to use this.

Since: 0.2.0.0

Specialised Read input token operations

decodeWordOf

Arguments

:: Word

Expected value of the decoded word

-> Decoder s ()

Attempt to decode a word with decodeWord, and ensure the word is exactly as expected, or fail.

Since: 0.2.0.0

decodeListLenOf :: Int -> Decoder s ()

Attempt to decode a list length using decodeListLen, and ensure it is exactly the specified length, or fail.

Since: 0.2.0.0

Branching operations

decodeListLenOrIndef :: Decoder s (Maybe Int)

Attempt to decode a token for the length of a finite, known list, or an indefinite list. If Nothing is returned, then an indefinite length list occurs afterwords. If Just x is returned, then a list of length x is encoded.

Since: 0.2.0.0

decodeMapLenOrIndef :: Decoder s (Maybe Int)

Attempt to decode a token for the length of a finite, known map, or an indefinite map. If Nothing is returned, then an indefinite length map occurs afterwords. If Just x is returned, then a map of length x is encoded.

Since: 0.2.0.0

decodeBreakOr :: Decoder s Bool

Attempt to decode a Break token, and if that was successful, return True. If the token was of any other type, return False.

Since: 0.2.0.0

Inspecting the token type

peekTokenType :: Decoder s TokenType

Peek at the current token we're about to decode, and return a TokenType specifying what it is.

Since: 0.2.0.0

peekAvailable :: Decoder s Int

Peek and return the length of the current buffer that we're running our decoder on.

Since: 0.2.0.0

data TokenType

The type of a token, which a decoder can ask for at an arbitrary time.

Since: 0.2.0.0

Constructors

TypeUInt

TypeUInt64

TypeNInt

TypeNInt64

TypeInteger

TypeFloat16

TypeFloat32

TypeFloat64

TypeBytes

TypeBytesIndef

TypeString

TypeStringIndef

TypeListLen

TypeListLen64

TypeListLenIndef

TypeMapLen

TypeMapLen64

TypeMapLenIndef

TypeTag

TypeTag64

TypeBool

TypeNull

TypeSimple

TypeBreak

TypeInvalid

Instances

Bounded TokenType

Methods

minBound :: TokenType

maxBound :: TokenType

Enum TokenType

Methods

succ :: TokenType -> TokenType

pred :: TokenType -> TokenType

toEnum :: Int -> TokenType

fromEnum :: TokenType -> Int

enumFrom :: TokenType -> [TokenType]

enumFromThen :: TokenType -> TokenType -> [TokenType]

enumFromTo :: TokenType -> TokenType -> [TokenType]

enumFromThenTo :: TokenType -> TokenType -> TokenType -> [TokenType]

Eq TokenType

Methods

(==) :: TokenType -> TokenType -> Bool

(/=) :: TokenType -> TokenType -> Bool

Ord TokenType

Methods

compare :: TokenType -> TokenType -> Ordering

(<) :: TokenType -> TokenType -> Bool

(<=) :: TokenType -> TokenType -> Bool

(>) :: TokenType -> TokenType -> Bool

(>=) :: TokenType -> TokenType -> Bool

max :: TokenType -> TokenType -> TokenType

min :: TokenType -> TokenType -> TokenType

Show TokenType

Methods

showsPrec :: Int -> TokenType -> ShowS

show :: TokenType -> String

showList :: [TokenType] -> ShowS

Special operations

Sequence operations

decodeSequenceLenIndef :: (r -> a -> r) -> r -> (r -> r') -> Decoder s a -> Decoder s r'

Decode an indefinite sequence length.

Since: 0.2.0.0

decodeSequenceLenN :: (r -> a -> r) -> r -> (r -> r') -> Int -> Decoder s a -> Decoder s r'

Decode a sequence length.

Since: 0.2.0.0