{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Data.Aeson.Decoding (
decode,
eitherDecode,
throwDecode,
decodeStrict,
eitherDecodeStrict,
throwDecodeStrict,
toEitherValue,
) where
import Control.Monad.Catch (MonadThrow (..))
import Data.Aeson.Key (Key)
import Data.Aeson.Types.Internal (formatError)
import Data.Scientific (Scientific)
import qualified Data.Aeson.KeyMap as KM
import qualified Data.Aeson.Types as A
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as L
import qualified Data.Vector as V
import Data.Aeson (AesonException (..))
import Data.Aeson.Decoding.ByteString
import Data.Aeson.Decoding.ByteString.Lazy
import Data.Aeson.Decoding.Tokens
decodeStrict :: (A.FromJSON a) => B.ByteString -> Maybe a
decodeStrict :: forall a. FromJSON a => ByteString -> Maybe a
decodeStrict ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
bsToTokens ByteString
bs)) (\String
_ -> forall a. Maybe a
Nothing) forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
bsSpace ByteString
bs' -> forall a. a -> Maybe a
Just a
x
| Bool
otherwise -> forall a. Maybe a
Nothing
A.IError JSONPath
_ String
_ -> forall a. Maybe a
Nothing
eitherDecodeStrict :: (A.FromJSON a) => B.ByteString -> Either String a
eitherDecodeStrict :: forall a. FromJSON a => ByteString -> Either String a
eitherDecodeStrict ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
bsToTokens ByteString
bs)) forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
bsSpace ByteString
bs' -> forall a b. b -> Either a b
Right a
x
| Bool
otherwise -> forall a b. a -> Either a b
Left String
"Trailing garbage"
A.IError JSONPath
path String
msg -> forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ JSONPath -> String -> String
formatError JSONPath
path String
msg
throwDecodeStrict :: forall a m. (A.FromJSON a, MonadThrow m) => B.ByteString -> m a
throwDecodeStrict :: forall a (m :: * -> *).
(FromJSON a, MonadThrow m) =>
ByteString -> m a
throwDecodeStrict ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
bsToTokens ByteString
bs)) (forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> AesonException
AesonException) forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
bsSpace ByteString
bs' -> forall (f :: * -> *) a. Applicative f => a -> f a
pure a
x
| Bool
otherwise -> forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall a b. (a -> b) -> a -> b
$ String -> AesonException
AesonException String
"Trailing garbage"
A.IError JSONPath
path String
msg -> forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall a b. (a -> b) -> a -> b
$ String -> AesonException
AesonException forall a b. (a -> b) -> a -> b
$ JSONPath -> String -> String
formatError JSONPath
path String
msg
decode :: (A.FromJSON a) => L.ByteString -> Maybe a
decode :: forall a. FromJSON a => ByteString -> Maybe a
decode ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
lbsToTokens ByteString
bs)) (\String
_ -> forall a. Maybe a
Nothing) forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
lbsSpace ByteString
bs' -> forall a. a -> Maybe a
Just a
x
| Bool
otherwise -> forall a. Maybe a
Nothing
A.IError JSONPath
_ String
_ -> forall a. Maybe a
Nothing
eitherDecode :: (A.FromJSON a) => L.ByteString -> Either String a
eitherDecode :: forall a. FromJSON a => ByteString -> Either String a
eitherDecode ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
lbsToTokens ByteString
bs)) forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
lbsSpace ByteString
bs' -> forall a b. b -> Either a b
Right a
x
| Bool
otherwise -> forall a b. a -> Either a b
Left String
"Trailing garbage"
A.IError JSONPath
path String
msg -> forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ JSONPath -> String -> String
formatError JSONPath
path String
msg
throwDecode :: forall a m. (A.FromJSON a, MonadThrow m) => L.ByteString -> m a
throwDecode :: forall a (m :: * -> *).
(FromJSON a, MonadThrow m) =>
ByteString -> m a
throwDecode ByteString
bs = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue (ByteString -> Tokens ByteString String
lbsToTokens ByteString
bs)) (forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> AesonException
AesonException) forall a b. (a -> b) -> a -> b
$ \Value
v ByteString
bs' -> case forall a. FromJSON a => Value -> IResult a
A.ifromJSON Value
v of
A.ISuccess a
x
| ByteString -> Bool
lbsSpace ByteString
bs' -> forall (f :: * -> *) a. Applicative f => a -> f a
pure a
x
| Bool
otherwise -> forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall a b. (a -> b) -> a -> b
$ String -> AesonException
AesonException String
"Trailing garbage"
A.IError JSONPath
path String
msg -> forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throwM forall a b. (a -> b) -> a -> b
$ String -> AesonException
AesonException forall a b. (a -> b) -> a -> b
$ JSONPath -> String -> String
formatError JSONPath
path String
msg
bsSpace :: B.ByteString -> Bool
bsSpace :: ByteString -> Bool
bsSpace = (Word8 -> Bool) -> ByteString -> Bool
B.all (\Word8
w -> Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x20 Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x0a Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x0d Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x09)
lbsSpace :: L.ByteString -> Bool
lbsSpace :: ByteString -> Bool
lbsSpace = (Word8 -> Bool) -> ByteString -> Bool
L.all (\Word8
w -> Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x20 Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x0a Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x0d Bool -> Bool -> Bool
|| Word8
w forall a. Eq a => a -> a -> Bool
== Word8
0x09)
toEitherValue
:: Tokens k e
-> Either e (A.Value, k)
toEitherValue :: forall k e. Tokens k e -> Either e (Value, k)
toEitherValue Tokens k e
t = forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult (forall k e. Tokens k e -> Result e k Value
toResultValue Tokens k e
t) forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ \Value
v k
k -> forall a b. b -> Either a b
Right (Value
v, k
k)
toResultValue
:: Tokens k e
-> Result e k A.Value
toResultValue :: forall k e. Tokens k e -> Result e k Value
toResultValue Tokens k e
t0 = forall e k a.
(forall r. (e -> r) -> (a -> k -> r) -> r) -> Result e k a
Result (forall k e r. Tokens k e -> (e -> r) -> (Value -> k -> r) -> r
go Tokens k e
t0) where
go :: Tokens k e -> (e -> r) -> (A.Value -> k -> r) -> r
go :: forall k e r. Tokens k e -> (e -> r) -> (Value -> k -> r) -> r
go (TkLit Lit
l k
k) e -> r
_ Value -> k -> r
f = Value -> k -> r
f (Lit -> Value
lit Lit
l) k
k
go (TkText Text
t k
k) e -> r
_ Value -> k -> r
f = Value -> k -> r
f (Text -> Value
A.String Text
t) k
k
go (TkNumber Number
n k
k) e -> r
_ Value -> k -> r
f = Value -> k -> r
f (Scientific -> Value
A.Number (Number -> Scientific
num Number
n)) k
k
go (TkArrayOpen TkArray k e
arr) e -> r
g Value -> k -> r
f = forall k e r.
Int
-> ([Value] -> [Value])
-> TkArray k e
-> (e -> r)
-> (Int -> [Value] -> k -> r)
-> r
goA Int
0 forall a. a -> a
id TkArray k e
arr e -> r
g forall a b. (a -> b) -> a -> b
$ \Int
n [Value]
xs k
k -> Value -> k -> r
f (Array -> Value
A.Array (forall a. Int -> [a] -> Vector a
V.fromListN Int
n [Value]
xs)) k
k
go (TkRecordOpen TkRecord k e
rec) e -> r
g Value -> k -> r
f = forall k e r.
[(Key, Value)]
-> TkRecord k e -> (e -> r) -> ([(Key, Value)] -> k -> r) -> r
goR [] TkRecord k e
rec e -> r
g forall a b. (a -> b) -> a -> b
$ \[(Key, Value)]
xs k
k -> Value -> k -> r
f (Object -> Value
A.Object (forall v. [(Key, v)] -> KeyMap v
KM.fromList [(Key, Value)]
xs)) k
k
go (TkErr e
e) e -> r
g Value -> k -> r
_ = e -> r
g e
e
lit :: Lit -> A.Value
lit :: Lit -> Value
lit Lit
LitNull = Value
A.Null
lit Lit
LitTrue = Bool -> Value
A.Bool Bool
True
lit Lit
LitFalse = Bool -> Value
A.Bool Bool
False
num :: Number -> Scientific
num :: Number -> Scientific
num (NumInteger Integer
n) = forall a. Num a => Integer -> a
fromInteger Integer
n
num (NumDecimal Scientific
s) = Scientific
s
num (NumScientific Scientific
s) = Scientific
s
goA :: Int
-> ([A.Value] -> [A.Value])
-> TkArray k e
-> (e -> r)
-> (Int -> [A.Value] -> k -> r)
-> r
goA :: forall k e r.
Int
-> ([Value] -> [Value])
-> TkArray k e
-> (e -> r)
-> (Int -> [Value] -> k -> r)
-> r
goA !Int
n ![Value] -> [Value]
acc (TkItem Tokens (TkArray k e) e
toks) e -> r
g Int -> [Value] -> k -> r
f = forall k e r. Tokens k e -> (e -> r) -> (Value -> k -> r) -> r
go Tokens (TkArray k e) e
toks e -> r
g forall a b. (a -> b) -> a -> b
$ \Value
v TkArray k e
k -> forall k e r.
Int
-> ([Value] -> [Value])
-> TkArray k e
-> (e -> r)
-> (Int -> [Value] -> k -> r)
-> r
goA (forall a. Enum a => a -> a
succ Int
n) ([Value] -> [Value]
acc forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Value
v forall a. a -> [a] -> [a]
:)) TkArray k e
k e -> r
g Int -> [Value] -> k -> r
f
goA !Int
n ![Value] -> [Value]
acc (TkArrayEnd k
k) e -> r
_ Int -> [Value] -> k -> r
f = Int -> [Value] -> k -> r
f Int
n ([Value] -> [Value]
acc []) k
k
goA !Int
_ ![Value] -> [Value]
_ (TkArrayErr e
e) e -> r
g Int -> [Value] -> k -> r
_ = e -> r
g e
e
goR :: [(Key, A.Value)]
-> TkRecord k e
-> (e -> r)
-> ([(Key, A.Value)] -> k -> r)
-> r
goR :: forall k e r.
[(Key, Value)]
-> TkRecord k e -> (e -> r) -> ([(Key, Value)] -> k -> r) -> r
goR ![(Key, Value)]
acc (TkPair Key
t Tokens (TkRecord k e) e
toks) e -> r
g [(Key, Value)] -> k -> r
f = forall k e r. Tokens k e -> (e -> r) -> (Value -> k -> r) -> r
go Tokens (TkRecord k e) e
toks e -> r
g forall a b. (a -> b) -> a -> b
$ \Value
v TkRecord k e
k -> forall k e r.
[(Key, Value)]
-> TkRecord k e -> (e -> r) -> ([(Key, Value)] -> k -> r) -> r
goR ((Key
t , Value
v) forall a. a -> [a] -> [a]
: [(Key, Value)]
acc) TkRecord k e
k e -> r
g [(Key, Value)] -> k -> r
f
goR ![(Key, Value)]
acc (TkRecordEnd k
k) e -> r
_ [(Key, Value)] -> k -> r
f = [(Key, Value)] -> k -> r
f [(Key, Value)]
acc k
k
goR ![(Key, Value)]
_ (TkRecordErr e
e) e -> r
g [(Key, Value)] -> k -> r
_ = e -> r
g e
e
newtype Result e k a = Result
{ forall e k a.
Result e k a -> forall r. (e -> r) -> (a -> k -> r) -> r
unResult :: forall r. (e -> r) -> (a -> k -> r) -> r }