Copyright	(c) Duncan Coutts 2015-2017
License	BSD3-style (see LICENSE.txt)
Maintainer	duncan@community.haskell.org
Stability	experimental
Portability	non-portable (GHC extensions)
Safe Haskell	None
Language	Haskell2010

Codec.Serialise.Decoding

Contents

Decode primitive operations
Sequence operations

Description

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

Synopsis

data Decoder s a
data DecodeAction s a
- = 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))
- | ConsumeWordCanonical (Word# -> ST s (DecodeAction s a))
- | ConsumeWord8Canonical (Word# -> ST s (DecodeAction s a))
- | ConsumeWord16Canonical (Word# -> ST s (DecodeAction s a))
- | ConsumeWord32Canonical (Word# -> ST s (DecodeAction s a))
- | ConsumeNegWordCanonical (Word# -> ST s (DecodeAction s a))
- | ConsumeIntCanonical (Int# -> ST s (DecodeAction s a))
- | ConsumeInt8Canonical (Int# -> ST s (DecodeAction s a))
- | ConsumeInt16Canonical (Int# -> ST s (DecodeAction s a))
- | ConsumeInt32Canonical (Int# -> ST s (DecodeAction s a))
- | ConsumeListLenCanonical (Int# -> ST s (DecodeAction s a))
- | ConsumeMapLenCanonical (Int# -> ST s (DecodeAction s a))
- | ConsumeTagCanonical (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))
- | ConsumeByteArray (ByteArray -> ST s (DecodeAction s a))
- | ConsumeString (Text -> ST s (DecodeAction s a))
- | ConsumeUtf8ByteArray (ByteArray -> ST s (DecodeAction s a))
- | ConsumeBool (Bool -> ST s (DecodeAction s a))
- | ConsumeSimple (Word# -> ST s (DecodeAction s a))
- | ConsumeIntegerCanonical (Integer -> ST s (DecodeAction s a))
- | ConsumeFloat16Canonical (Float# -> ST s (DecodeAction s a))
- | ConsumeFloatCanonical (Float# -> ST s (DecodeAction s a))
- | ConsumeDoubleCanonical (Double# -> ST s (DecodeAction s a))
- | ConsumeBytesCanonical (ByteString -> ST s (DecodeAction s a))
- | ConsumeByteArrayCanonical (ByteArray -> ST s (DecodeAction s a))
- | ConsumeStringCanonical (Text -> ST s (DecodeAction s a))
- | ConsumeUtf8ByteArrayCanonical (ByteArray -> ST s (DecodeAction s a))
- | ConsumeSimpleCanonical (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
getDecodeAction :: Decoder s a -> ST s (DecodeAction s a)
decodeWord :: Decoder s Word
decodeWord8 :: Decoder s Word8
decodeWord16 :: Decoder s Word16
decodeWord32 :: Decoder s Word32
decodeWord64 :: Decoder s Word64
decodeNegWord :: Decoder s Word
decodeNegWord64 :: Decoder s Word64
decodeInt :: Decoder s Int
decodeInt8 :: Decoder s Int8
decodeInt16 :: Decoder s Int16
decodeInt32 :: Decoder s Int32
decodeInt64 :: Decoder s Int64
decodeInteger :: Decoder s Integer
decodeFloat :: Decoder s Float
decodeDouble :: Decoder s Double
decodeBytes :: Decoder s ByteString
decodeBytesIndef :: Decoder s ()
decodeByteArray :: Decoder s ByteArray
decodeString :: Decoder s Text
decodeStringIndef :: Decoder s ()
decodeUtf8ByteArray :: Decoder s ByteArray
decodeListLen :: Decoder s Int
decodeListLenIndef :: Decoder s ()
decodeMapLen :: Decoder s Int
decodeMapLenIndef :: Decoder s ()
decodeTag :: Decoder s Word
decodeTag64 :: Decoder s Word64
decodeBool :: Decoder s Bool
decodeNull :: Decoder s ()
decodeSimple :: Decoder s Word8
decodeWordOf :: Word -> Decoder s ()
decodeListLenOf :: Int -> Decoder s ()
decodeListLenOrIndef :: Decoder s (Maybe Int)
decodeMapLenOrIndef :: Decoder s (Maybe Int)
decodeBreakOr :: Decoder s Bool
peekTokenType :: Decoder s TokenType
peekAvailable :: Decoder s Int
data TokenType
- = 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
decodeSequenceLenIndef :: (r -> a -> r) -> r -> (r -> r') -> Decoder s a -> Decoder s r'
decodeSequenceLenN :: (r -> a -> r) -> r -> (r -> r') -> Int -> Decoder s a -> Decoder s r'

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: cborg-0.2.0.0

Instances

Monad (Decoder s)	Since: cborg-0.2.0.0
Instance details Defined in Codec.CBOR.Decoding 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: cborg-0.2.0.0
Instance details Defined in Codec.CBOR.Decoding Methods fmap :: (a -> b) -> Decoder s a -> Decoder s b # (<$) :: a -> Decoder s b -> Decoder s a #
MonadFail (Decoder s)	Since: cborg-0.2.0.0
Instance details Defined in Codec.CBOR.Decoding Methods fail :: String -> Decoder s a #
Applicative (Decoder s)	Since: cborg-0.2.0.0
Instance details Defined in Codec.CBOR.Decoding 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: cborg-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))
ConsumeWordCanonical (Word# -> ST s (DecodeAction s a))
ConsumeWord8Canonical (Word# -> ST s (DecodeAction s a))
ConsumeWord16Canonical (Word# -> ST s (DecodeAction s a))
ConsumeWord32Canonical (Word# -> ST s (DecodeAction s a))
ConsumeNegWordCanonical (Word# -> ST s (DecodeAction s a))
ConsumeIntCanonical (Int# -> ST s (DecodeAction s a))
ConsumeInt8Canonical (Int# -> ST s (DecodeAction s a))
ConsumeInt16Canonical (Int# -> ST s (DecodeAction s a))
ConsumeInt32Canonical (Int# -> ST s (DecodeAction s a))
ConsumeListLenCanonical (Int# -> ST s (DecodeAction s a))
ConsumeMapLenCanonical (Int# -> ST s (DecodeAction s a))
ConsumeTagCanonical (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))
ConsumeByteArray (ByteArray -> ST s (DecodeAction s a))
ConsumeString (Text -> ST s (DecodeAction s a))
ConsumeUtf8ByteArray (ByteArray -> ST s (DecodeAction s a))
ConsumeBool (Bool -> ST s (DecodeAction s a))
ConsumeSimple (Word# -> ST s (DecodeAction s a))
ConsumeIntegerCanonical (Integer -> ST s (DecodeAction s a))
ConsumeFloat16Canonical (Float# -> ST s (DecodeAction s a))
ConsumeFloatCanonical (Float# -> ST s (DecodeAction s a))
ConsumeDoubleCanonical (Double# -> ST s (DecodeAction s a))
ConsumeBytesCanonical (ByteString -> ST s (DecodeAction s a))
ConsumeByteArrayCanonical (ByteArray -> ST s (DecodeAction s a))
ConsumeStringCanonical (Text -> ST s (DecodeAction s a))
ConsumeUtf8ByteArrayCanonical (ByteArray -> ST s (DecodeAction s a))
ConsumeSimpleCanonical (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

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

Given a Decoder, give us the DecodeAction

Since: cborg-0.2.0.0

Read input tokens

decodeWord :: Decoder s Word #

Decode a Word.

Since: cborg-0.2.0.0

decodeWord8 :: Decoder s Word8 #

Decode a Word8.

Since: cborg-0.2.0.0

decodeWord16 :: Decoder s Word16 #

Decode a Word16.

Since: cborg-0.2.0.0

decodeWord32 :: Decoder s Word32 #

Decode a Word32.

Since: cborg-0.2.0.0

decodeWord64 :: Decoder s Word64 #

Decode a Word64.

Since: cborg-0.2.0.0

decodeNegWord :: Decoder s Word #

Decode a negative Word.

Since: cborg-0.2.0.0

decodeNegWord64 :: Decoder s Word64 #

Decode a negative Word64.

Since: cborg-0.2.0.0

decodeInt :: Decoder s Int #

Decode an Int.

Since: cborg-0.2.0.0

decodeInt8 :: Decoder s Int8 #

Decode an Int8.

Since: cborg-0.2.0.0

decodeInt16 :: Decoder s Int16 #

Decode an Int16.

Since: cborg-0.2.0.0

decodeInt32 :: Decoder s Int32 #

Decode an Int32.

Since: cborg-0.2.0.0

decodeInt64 :: Decoder s Int64 #

Decode an Int64.

Since: cborg-0.2.0.0

decodeInteger :: Decoder s Integer #

Decode an Integer.

Since: cborg-0.2.0.0

decodeFloat :: Decoder s Float #

Decode a Float.

Since: cborg-0.2.0.0

decodeDouble :: Decoder s Double #

Decode a Double.

Since: cborg-0.2.0.0

decodeBytes :: Decoder s ByteString #

Decode a string of bytes as a ByteString.

Since: cborg-0.2.0.0

decodeBytesIndef :: Decoder s () #

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

Since: cborg-0.2.0.0

decodeByteArray :: Decoder s ByteArray #

Decode a string of bytes as a ByteArray.

Also note that this will eagerly copy the content out of the input to ensure that the input does not leak in the event that the ByteArray is live but not forced.

Since: cborg-0.2.0.0

decodeString :: Decoder s Text #

Decode a textual string as a piece of Text.

Since: cborg-0.2.0.0

decodeStringIndef :: Decoder s () #

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

Since: cborg-0.2.0.0

decodeUtf8ByteArray :: Decoder s ByteArray #

Decode a textual string as UTF-8 encoded ByteArray. Note that the result is not validated to be well-formed UTF-8.

Also note that this will eagerly copy the content out of the input to ensure that the input does not leak in the event that the ByteArray is live but not forced.

Since: cborg-0.2.0.0

decodeListLen :: Decoder s Int #

Decode the length of a list.

Since: cborg-0.2.0.0

decodeListLenIndef :: Decoder s () #

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

Since: cborg-0.2.0.0

decodeMapLen :: Decoder s Int #

Decode the length of a map.

Since: cborg-0.2.0.0

decodeMapLenIndef :: Decoder s () #

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

Since: cborg-0.2.0.0

decodeTag :: Decoder s Word #

Decode an arbitrary tag and return it as a Word.

Since: cborg-0.2.0.0

decodeTag64 :: Decoder s Word64 #

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

Since: cborg-0.2.0.0

decodeBool :: Decoder s Bool #

Decode a bool.

Since: cborg-0.2.0.0

decodeNull :: Decoder s () #

Decode a nullary value, and return a unit value.

Since: cborg-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: cborg-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: cborg-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: cborg-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: cborg-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: cborg-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: cborg-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: cborg-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: cborg-0.2.0.0

data TokenType #

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

Since: cborg-0.2.0.0

Instances

Bounded TokenType
Instance details Defined in Codec.CBOR.Decoding Methods minBound :: TokenType # maxBound :: TokenType #
Enum TokenType
Instance details Defined in Codec.CBOR.Decoding 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
Instance details Defined in Codec.CBOR.Decoding Methods (==) :: TokenType -> TokenType -> Bool # (/=) :: TokenType -> TokenType -> Bool #
Ord TokenType
Instance details Defined in Codec.CBOR.Decoding 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
Instance details Defined in Codec.CBOR.Decoding 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: cborg-0.2.0.0

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

Decode a sequence length.

Since: cborg-0.2.0.0

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