@@ -1,8 +1,7 @@
1{-# LANGUAGE CPP, DeriveDataTypeable, DeriveFunctor #-}
1{-# LANGUAGE CPP, DeriveDataTypeable, DeriveFunctor #-}
2{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
2{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
3{-# LANGUAGE PatternGuards, ScopedTypeVariables #-}
3{-# LANGUAGE PatternGuards, ScopedTypeVariables #-}
4−{-# LANGUAGE RecordWildCards #-}
4+{-# LANGUAGE RecordWildCards, TemplateHaskell #-}
5−{-# LANGUAGE PolyKinds #-}
8Module: Database.PostgreSQL.Simple.FromField
7Module: Database.PostgreSQL.Simple.FromField
@@ -24,24 +23,6 @@ the Haskell 'Double' type is compatible with the PostgreSQL's 32-bit
24since a 'Double' might lose precision if representing PostgreSQL's 64-bit
23since a 'Double' might lose precision if representing PostgreSQL's 64-bit
25@bigint@, the two are /not/ considered compatible.
24@bigint@, the two are /not/ considered compatible.
27−Note that the 'Float' and 'Double' instances use attoparsec's 'double'
28−conversion routine, which sacrifices some accuracy for speed. If you
29−need accuracy, consider first converting data to a 'Scientific' or 'Rational'
30−type, and then converting to a floating-point type. If you are defining
31−your own 'Database.PostgreSQL.Simple.FromRow.FromRow' instances, this can be
33−@'fromRational' '<$>' 'Database.PostgreSQL.Simple.FromRow.field'@, although
34−this idiom is additionally compatible with PostgreSQL's @int8@ and @numeric@
35−types. If this is unacceptable, you may find
36−'Database.PostgreSQL.Simple.FromRow.fieldWith' useful.
38−Also note that while converting to a 'Double' through the 'Scientific' type
39−is likely somewhat faster than converting through the 'Rational' type,
40−the 'Scientific' type has no way to represent @NaN@ and @±Infinity@ values.
41−Thus, if you need precision conversion of regular floating point values
42−and the possibility of receiving these special values from the backend,
43−stick with 'Rational'.
45Because 'FromField' is a typeclass, one may provide conversions to
26Because 'FromField' is a typeclass, one may provide conversions to
46additional Haskell types without modifying postgresql-simple. This is
27additional Haskell types without modifying postgresql-simple. This is
47particularly useful for supporting PostgreSQL types that postgresql-simple
28particularly useful for supporting PostgreSQL types that postgresql-simple
@@ -106,38 +87,32 @@ module Database.PostgreSQL.Simple.FromField
106 , typeOid
87 , typeOid
107 , PQ.Oid(..)
88 , PQ.Oid(..)
108 , PQ.Format(..)
89 , PQ.Format(..)
109− , pgArrayFieldParser
113 , fromJSONField
91 , fromJSONField
114− , fromFieldJSONByteString
117#include "MachDeps.h"
94#include "MachDeps.h"
119−import Control.Applicative ( Const(Const), (<|>), (<$>), pure, (*>), (<*) )
96+import Control.Applicative
120−import Control.Concurrent.MVar (MVar, newMVar)
97+ ( Applicative, (<|>), (<$>), pure )
121−import Control.Exception (Exception (toException, fromException))
98+import Control.Exception (Exception)
122import qualified Data.Aeson as JSON
99import qualified Data.Aeson as JSON
123−import Data.Attoparsec.ByteString.Char8 hiding (Result)
100+import Data.Attoparsec.Char8 hiding (Result)
124import Data.ByteString (ByteString)
101import Data.ByteString (ByteString)
125import qualified Data.ByteString.Char8 as B
102import qualified Data.ByteString.Char8 as B
126−import Data.Functor.Identity (Identity(Identity))
127import Data.Int (Int16, Int32, Int64)
103import Data.Int (Int16, Int32, Int64)
128−import Data.IORef (IORef, newIORef)
129import Data.Ratio (Ratio)
104import Data.Ratio (Ratio)
130−import Data.Time.Compat ( UTCTime, ZonedTime, LocalTime, Day, TimeOfDay, CalendarDiffTime )
105+import Data.Time ( UTCTime, ZonedTime, LocalTime, Day, TimeOfDay )
131import Data.Typeable (Typeable, typeOf)
106import Data.Typeable (Typeable, typeOf)
132import Data.Vector (Vector)
107import Data.Vector (Vector)
133−import Data.Vector.Mutable (IOVector)
134import qualified Data.Vector as V
108import qualified Data.Vector as V
135import Database.PostgreSQL.Simple.Internal
109import Database.PostgreSQL.Simple.Internal
136import Database.PostgreSQL.Simple.Compat
110import Database.PostgreSQL.Simple.Compat
137import Database.PostgreSQL.Simple.Ok
111import Database.PostgreSQL.Simple.Ok
138−import Database.PostgreSQL.Simple.Types
112+import Database.PostgreSQL.Simple.Types (Binary(..), Null(..))
139import Database.PostgreSQL.Simple.TypeInfo as TI
113import Database.PostgreSQL.Simple.TypeInfo as TI
140import qualified Database.PostgreSQL.Simple.TypeInfo.Static as TI
114import qualified Database.PostgreSQL.Simple.TypeInfo.Static as TI
115+import Database.PostgreSQL.Simple.TypeInfo.Macro as TI
141import Database.PostgreSQL.Simple.Time
116import Database.PostgreSQL.Simple.Time
142import Database.PostgreSQL.Simple.Arrays as Arrays
117import Database.PostgreSQL.Simple.Arrays as Arrays
143import qualified Database.PostgreSQL.LibPQ as PQ
118import qualified Database.PostgreSQL.LibPQ as PQ
@@ -147,14 +122,8 @@ import qualified Data.ByteString.Lazy as LB
147import qualified Data.Text as ST
122import qualified Data.Text as ST
148import qualified Data.Text.Encoding as ST
123import qualified Data.Text.Encoding as ST
149import qualified Data.Text.Lazy as LT
124import qualified Data.Text.Lazy as LT
150−import Data.CaseInsensitive (CI)
125+import Data.UUID (UUID)
151−import qualified Data.CaseInsensitive as CI
152−import Data.UUID.Types (UUID)
153−import qualified Data.UUID.Types as UUID
126+import qualified Data.UUID as UUID
154−import Data.Scientific (Scientific)
155−import GHC.Real (infinity, notANumber)
157−import qualified Data.Aeson.Types as JSON
159-- | Exception thrown if conversion from a SQL value to a Haskell
128-- | Exception thrown if conversion from a SQL value to a Haskell
160-- value fails.
129-- value fails.
@@ -182,9 +151,7 @@ data ResultError = Incompatible { errSQLType :: String
182 -- between metadata and actual data in a row).
151 -- between metadata and actual data in a row).
183 deriving (Eq, Show, Typeable)
152 deriving (Eq, Show, Typeable)
185−instance Exception ResultError where
154+instance Exception ResultError
186− toException = postgresqlExceptionToException
187− fromException = postgresqlExceptionFromException
189left :: Exception a => a -> Conversion b
156left :: Exception a => a -> Conversion b
190left = conversionError
157left = conversionError
@@ -199,16 +166,6 @@ class FromField a where
199 -- Returns a list of exceptions if the conversion fails. In the case of
166 -- Returns a list of exceptions if the conversion fails. In the case of
200 -- library instances, this will usually be a single 'ResultError', but
167 -- library instances, this will usually be a single 'ResultError', but
201 -- may be a 'UnicodeException'.
168 -- may be a 'UnicodeException'.
203− -- Note that retaining any reference to the 'Field' argument causes
204− -- the entire @LibPQ.'PQ.Result'@ to be retained. Thus, implementations
205− -- of 'fromField' should return results that do not refer to this value
206− -- after the result have been evaluated to WHNF.
208− -- Note that as of @postgresql-simple-0.4.0.0@, the 'ByteString' value
209− -- has already been copied out of the @LibPQ.'PQ.Result'@ before it has
210− -- been passed to 'fromField'. This is because for short strings, it's
211− -- cheaper to copy the string than to set up a finalizer.
213-- | Returns the data type name. This is the preferred way of identifying
170-- | Returns the data type name. This is the preferred way of identifying
214-- types that do not have a stable type oid, such as types provided by
171-- types that do not have a stable type oid, such as types provided by
@@ -225,7 +182,7 @@ typename field = typname <$> typeInfo field
226typeInfo :: Field -> Conversion TypeInfo
183typeInfo :: Field -> Conversion TypeInfo
227typeInfo Field{..} = Conversion $ \conn -> do
184typeInfo Field{..} = Conversion $ \conn -> do
228− Ok <$> (getTypeInfo conn typeOid)
185+ Ok <$> (getTypeInfo conn =<< PQ.ftype result column)
230typeInfoByOid :: PQ.Oid -> Conversion TypeInfo
187typeInfoByOid :: PQ.Oid -> Conversion TypeInfo
231typeInfoByOid oid = Conversion $ \conn -> do
188typeInfoByOid oid = Conversion $ \conn -> do
@@ -250,11 +207,9 @@ tableOid Field{..} = toMaybeOid (unsafeDupablePerformIO (PQ.ftable result column
250 then Nothing
207 then Nothing
251 else Just x
208 else Just x
253−-- | If the column has a table associated with it, this returns the
210+-- | If the column has a table associated with it, this returns the number
254−-- number of the associated table column. Table columns have
211+-- off the associated table column. Numbering starts from 0. Analogous
255−-- nonzero numbers. Zero is returned if the specified column is not
256−-- a simple reference to a table column, or when using pre-3.0
257−-- protocol. Analogous to libpq's @PQftablecol@.
212+-- to libpq's @PQftablecol@.
259tableColumn :: Field -> Int
214tableColumn :: Field -> Int
260tableColumn Field{..} = fromCol (unsafeDupablePerformIO (PQ.ftablecol result column))
215tableColumn Field{..} = fromCol (unsafeDupablePerformIO (PQ.ftablecol result column))
@@ -270,33 +225,16 @@ format Field{..} = unsafeDupablePerformIO (PQ.fformat result column)
271instance FromField () where
226instance FromField () where
272 fromField f _bs
227 fromField f _bs
273− | typeOid f /= TI.voidOid = returnError Incompatible f ""
228+ | typeOid f /= $(inlineTypoid TI.void) = returnError Incompatible f ""
274 | otherwise = pure ()
229 | otherwise = pure ()
276−instance (FromField a) => FromField (Const a b) where
277− fromField f bs = Const <$> fromField f bs
279−instance (FromField a) => FromField (Identity a) where
280− fromField f bs = Identity <$> fromField f bs
282-- | For dealing with null values. Compatible with any postgresql type
231-- | For dealing with null values. Compatible with any postgresql type
283-- compatible with type @a@. Note that the type is not checked if
232-- compatible with type @a@. Note that the type is not checked if
284-- the value is null, although it is inadvisable to rely on this
233-- the value is null, although it is inadvisable to rely on this
285-- behavior.
234-- behavior.
286−instance FromField a => FromField (Maybe a) where
235+instance (FromField a) => FromField (Maybe a) where
287− fromField = optionalField fromField
289−-- | For dealing with SQL @null@ values outside of the 'FromField' class.
290−-- Alternatively, one could use 'Control.Applicative.optional', but that
291−-- also turns type and conversion errors into 'Nothing', whereas this is
292−-- more specific and turns only @null@ values into 'Nothing'.
294−optionalField :: FieldParser a -> FieldParser (Maybe a)
295−optionalField p f mv =
297− Nothing -> pure Nothing
236+ fromField _ Nothing = pure Nothing
298− Just _ -> Just <$> p f mv
237+ fromField f bs = Just <$> fromField f bs
299−{-# INLINE optionalField #-}
301-- | compatible with any data type, but the value must be null
239-- | compatible with any data type, but the value must be null
302instance FromField Null where
240instance FromField Null where
@@ -306,30 +244,30 @@ instance FromField Null where
307instance FromField Bool where
245instance FromField Bool where
308 fromField f bs
246 fromField f bs
309− | typeOid f /= TI.boolOid = returnError Incompatible f ""
247+ | typeOid f /= $(inlineTypoid TI.bool) = returnError Incompatible f ""
310 | bs == Nothing = returnError UnexpectedNull f ""
248 | bs == Nothing = returnError UnexpectedNull f ""
311 | bs == Just "t" = pure True
249 | bs == Just "t" = pure True
312 | bs == Just "f" = pure False
250 | bs == Just "f" = pure False
313 | otherwise = returnError ConversionFailed f ""
251 | otherwise = returnError ConversionFailed f ""
315−-- | \"char\", bpchar
253+-- | \"char\"
316instance FromField Char where
254instance FromField Char where
317− fromField f bs0 =
255+ fromField f bs =
318− if (eq TI.charOid \/ eq TI.bpcharOid) (typeOid f)
256+ if typeOid f /= $(inlineTypoid TI.char)
257+ then returnError Incompatible f ""
319− then case bs0 of
258+ else case bs of
320 Nothing -> returnError UnexpectedNull f ""
259 Nothing -> returnError UnexpectedNull f ""
321 Just bs -> if B.length bs /= 1
260 Just bs -> if B.length bs /= 1
322 then returnError ConversionFailed f "length not 1"
261 then returnError ConversionFailed f "length not 1"
323 else return $! (B.head bs)
262 else return $! (B.head bs)
324− else returnError Incompatible f ""
327instance FromField Int16 where
265instance FromField Int16 where
328− fromField = attoFieldParser ok16 $ signed decimal
266+ fromField = atto ok16 $ signed decimal
330-- | int2, int4
268-- | int2, int4
331instance FromField Int32 where
269instance FromField Int32 where
332− fromField = attoFieldParser ok32 $ signed decimal
270+ fromField = atto ok32 $ signed decimal
334#if WORD_SIZE_IN_BITS < 64
272#if WORD_SIZE_IN_BITS < 64
335-- | int2, int4, and if compiled as 64-bit code, int8 as well.
273-- | int2, int4, and if compiled as 64-bit code, int8 as well.
@@ -339,64 +277,43 @@ instance FromField Int32 where
339-- This library was compiled as 64-bit code.
277-- This library was compiled as 64-bit code.
341instance FromField Int where
279instance FromField Int where
342− fromField = attoFieldParser okInt $ signed decimal
280+ fromField = atto okInt $ signed decimal
344-- | int2, int4, int8
282-- | int2, int4, int8
345instance FromField Int64 where
283instance FromField Int64 where
346− fromField = attoFieldParser ok64 $ signed decimal
284+ fromField = atto ok64 $ signed decimal
348-- | int2, int4, int8
286-- | int2, int4, int8
349instance FromField Integer where
287instance FromField Integer where
350− fromField = attoFieldParser ok64 $ signed decimal
288+ fromField = atto ok64 $ signed decimal
352−-- | int2, float4 (Uses attoparsec's 'double' routine, for
290+-- | int2, float4
353−-- better accuracy convert to 'Scientific' or 'Rational' first)
354instance FromField Float where
291instance FromField Float where
355− fromField = attoFieldParser ok (realToFrac <$> pg_double)
292+ fromField = atto ok (realToFrac <$> double)
356− where ok = eq TI.float4Oid \/ eq TI.int2Oid
293+ where ok = $(mkCompats [TI.float4,TI.int2])
358−-- | int2, int4, float4, float8 (Uses attoparsec's 'double' routine, for
295+-- | int2, int4, float4, float8
359−-- better accuracy convert to 'Scientific' or 'Rational' first)
360instance FromField Double where
296instance FromField Double where
361− fromField = attoFieldParser ok pg_double
297+ fromField = atto ok double
362− where ok = eq TI.float4Oid \/ eq TI.float8Oid \/ eq TI.int2Oid \/ eq TI.int4Oid
298+ where ok = $(mkCompats [TI.float4,TI.float8,TI.int2,TI.int4])
364−-- | int2, int4, int8, float4, float8, numeric
300+-- | int2, int4, float4, float8, numeric
365instance FromField (Ratio Integer) where
301instance FromField (Ratio Integer) where
366− fromField = attoFieldParser ok pg_rational
302+ fromField = atto ok rational
367− where ok = eq TI.float4Oid \/ eq TI.float8Oid \/ eq TI.int2Oid \/ eq TI.int4Oid \/ eq TI.int8Oid \/ eq TI.numericOid
369−-- | int2, int4, int8, float4, float8, numeric
303+ where ok = $(mkCompats [TI.float4,TI.float8,TI.int2,TI.int4,TI.numeric])
370−instance FromField Scientific where
371− fromField = attoFieldParser ok rational
372− where ok = eq TI.float4Oid \/ eq TI.float8Oid \/ eq TI.int2Oid \/ eq TI.int4Oid \/ eq TI.int8Oid \/ eq TI.numericOid
374unBinary :: Binary t -> t
305unBinary :: Binary t -> t
375unBinary (Binary x) = x
306unBinary (Binary x) = x
377−pg_double :: Parser Double
379− = (string "NaN" *> pure ( 0 / 0))
380− <|> (string "Infinity" *> pure ( 1 / 0))
381− <|> (string "-Infinity" *> pure (-1 / 0))
384−pg_rational :: Parser Rational
386− = (string "NaN" *> pure notANumber )
387− <|> (string "Infinity" *> pure infinity )
388− <|> (string "-Infinity" *> pure (-infinity))
391-- | bytea, name, text, \"char\", bpchar, varchar, unknown
308-- | bytea, name, text, \"char\", bpchar, varchar, unknown
392instance FromField SB.ByteString where
309instance FromField SB.ByteString where
393− fromField f dat = if typeOid f == TI.byteaOid
310+ fromField f dat = if typeOid f == $(inlineTypoid TI.bytea)
394 then unBinary <$> fromField f dat
311 then unBinary <$> fromField f dat
395 else doFromField f okText' pure dat
312 else doFromField f okText' pure dat
398instance FromField PQ.Oid where
315instance FromField PQ.Oid where
399− fromField f dat = PQ.Oid <$> attoFieldParser (== TI.oidOid) decimal f dat
316+ fromField f dat = PQ.Oid <$> atto (== $(inlineTypoid TI.oid)) decimal f dat
401-- | bytea, name, text, \"char\", bpchar, varchar, unknown
318-- | bytea, name, text, \"char\", bpchar, varchar, unknown
402instance FromField LB.ByteString where
319instance FromField LB.ByteString where
@@ -404,7 +321,7 @@ instance FromField LB.ByteString where
405unescapeBytea :: Field -> SB.ByteString
322unescapeBytea :: Field -> SB.ByteString
406 -> Conversion (Binary SB.ByteString)
323 -> Conversion (Binary SB.ByteString)
407−unescapeBytea f str' = case unsafeDupablePerformIO (PQ.unescapeBytea str') of
324+unescapeBytea f str = case unsafeDupablePerformIO (PQ.unescapeBytea str) of
408 Nothing -> returnError ConversionFailed f "unescapeBytea failed"
325 Nothing -> returnError ConversionFailed f "unescapeBytea failed"
409 Just str -> pure (Binary str)
326 Just str -> pure (Binary str)
@@ -427,85 +344,54 @@ instance FromField ST.Text where
427instance FromField LT.Text where
344instance FromField LT.Text where
428 fromField f dat = LT.fromStrict <$> fromField f dat
345 fromField f dat = LT.fromStrict <$> fromField f dat
431−instance FromField (CI ST.Text) where
432− fromField f mdat = do
435− then returnError Incompatible f ""
437− Nothing -> returnError UnexpectedNull f ""
438− Just dat -> either left (pure . CI.mk)
439− (ST.decodeUtf8' dat)
442−instance FromField (CI LT.Text) where
443− fromField f mdat = do
446− then returnError Incompatible f ""
448− Nothing -> returnError UnexpectedNull f ""
449− Just dat -> either left (pure . CI.mk . LT.fromStrict)
450− (ST.decodeUtf8' dat)
452-- | name, text, \"char\", bpchar, varchar
347-- | name, text, \"char\", bpchar, varchar
453instance FromField [Char] where
348instance FromField [Char] where
454 fromField f dat = ST.unpack <$> fromField f dat
349 fromField f dat = ST.unpack <$> fromField f dat
456-- | timestamptz
351-- | timestamptz
457instance FromField UTCTime where
352instance FromField UTCTime where
458− fromField = ff TI.timestamptzOid "UTCTime" parseUTCTime
353+ fromField = ff $(inlineTypoid TI.timestamptz) "UTCTime" parseUTCTime
460-- | timestamptz
355-- | timestamptz
461instance FromField ZonedTime where
356instance FromField ZonedTime where
462− fromField = ff TI.timestamptzOid "ZonedTime" parseZonedTime
357+ fromField = ff $(inlineTypoid TI.timestamptz) "ZonedTime" parseZonedTime
464-- | timestamp
359-- | timestamp
465instance FromField LocalTime where
360instance FromField LocalTime where
466− fromField = ff TI.timestampOid "LocalTime" parseLocalTime
361+ fromField = ff $(inlineTypoid TI.timestamp) "LocalTime" parseLocalTime
469instance FromField Day where
364instance FromField Day where
470− fromField = ff TI.dateOid "Day" parseDay
365+ fromField = ff $(inlineTypoid TI.date) "Day" parseDay
473instance FromField TimeOfDay where
368instance FromField TimeOfDay where
474− fromField = ff TI.timeOid "TimeOfDay" parseTimeOfDay
369+ fromField = ff $(inlineTypoid TI.time) "TimeOfDay" parseTimeOfDay
476-- | timestamptz
371-- | timestamptz
477instance FromField UTCTimestamp where
372instance FromField UTCTimestamp where
478− fromField = ff TI.timestamptzOid "UTCTimestamp" parseUTCTimestamp
373+ fromField = ff $(inlineTypoid TI.timestamptz) "UTCTimestamp" parseUTCTimestamp
480-- | timestamptz
375-- | timestamptz
481instance FromField ZonedTimestamp where
376instance FromField ZonedTimestamp where
482− fromField = ff TI.timestamptzOid "ZonedTimestamp" parseZonedTimestamp
377+ fromField = ff $(inlineTypoid TI.timestamptz) "ZonedTimestamp" parseZonedTimestamp
484-- | timestamp
379-- | timestamp
485instance FromField LocalTimestamp where
380instance FromField LocalTimestamp where
486− fromField = ff TI.timestampOid "LocalTimestamp" parseLocalTimestamp
381+ fromField = ff $(inlineTypoid TI.timestamp) "LocalTimestamp" parseLocalTimestamp
489instance FromField Date where
384instance FromField Date where
490− fromField = ff TI.dateOid "Date" parseDate
385+ fromField = ff $(inlineTypoid TI.date) "Date" parseDate
492−-- | interval. Requires you to configure intervalstyle as @iso_8601@.
494−-- You can configure intervalstyle on every connection with a @SET@ command,
495−-- but for better performance you may want to configure it permanently in the
496−-- file found with @SHOW config_file;@ .
498−instance FromField CalendarDiffTime where
499− fromField = ff TI.intervalOid "CalendarDiffTime" parseCalendarDiffTime
501ff :: PQ.Oid -> String -> (B8.ByteString -> Either String a)
387ff :: PQ.Oid -> String -> (B8.ByteString -> Either String a)
502 -> Field -> Maybe B8.ByteString -> Conversion a
388 -> Field -> Maybe B8.ByteString -> Conversion a
503−ff compatOid hsType parseBS f mstr =
389+ff compatOid hsType parse f mstr =
504 if typeOid f /= compatOid
390 if typeOid f /= compatOid
505 then err Incompatible ""
391 then err Incompatible ""
506 else case mstr of
392 else case mstr of
507 Nothing -> err UnexpectedNull ""
393 Nothing -> err UnexpectedNull ""
508− Just str -> case parseBS str of
394+ Just str -> case parse str of
509 Left msg -> err ConversionFailed msg
395 Left msg -> err ConversionFailed msg
510 Right val -> return val
396 Right val -> return val
@@ -526,45 +412,33 @@ instance (FromField a, FromField b) => FromField (Either a b) where
526 <|> (Left <$> fromField f dat)
412 <|> (Left <$> fromField f dat)
528-- | any postgresql array whose elements are compatible with type @a@
414-- | any postgresql array whose elements are compatible with type @a@
529−instance (FromField a, Typeable a) => FromField (PGArray a) where
415+instance (FromField a, Typeable a) => FromField (Vector a) where
530− fromField = pgArrayFieldParser fromField
416+ fromField f mdat = do
532−pgArrayFieldParser :: Typeable a => FieldParser a -> FieldParser (PGArray a)
533−pgArrayFieldParser fieldParser f mdat = do
534 info <- typeInfo f
417 info <- typeInfo f
535 case info of
418 case info of
536 TI.Array{} ->
419 TI.Array{} ->
537 case mdat of
420 case mdat of
538 Nothing -> returnError UnexpectedNull f ""
421 Nothing -> returnError UnexpectedNull f ""
539 Just dat -> do
422 Just dat -> do
540− case parseOnly (fromArray fieldParser info f) dat of
423+ case parseOnly (fromArray info f) dat of
541 Left err -> returnError ConversionFailed f err
424 Left err -> returnError ConversionFailed f err
542− Right conv -> PGArray <$> conv
425+ Right conv -> V.fromList <$> conv
543 _ -> returnError Incompatible f ""
426 _ -> returnError Incompatible f ""
428+fromArray :: (FromField a)
545−fromArray :: FieldParser a -> TypeInfo -> Field -> Parser (Conversion [a])
429+ => TypeInfo -> Field -> Parser (Conversion [a])
546−fromArray fieldParser typInfo f = sequence . (parseIt <$>) <$> array delim
430+fromArray typeInfo f = sequence . (parseIt <$>) <$> array delim
548− delim = typdelim (typelem typInfo)
432+ delim = typdelim (typelem typeInfo)
549− fElem = f{ typeOid = typoid (typelem typInfo) }
433+ fElem = f{ typeOid = typoid (typelem typeInfo) }
551− parseIt item =
434+ parseIt item = (fromField f' . Just . fmt delim) item
552− fieldParser f' $ if item == Arrays.Plain "NULL" then Nothing else Just item'
554− item' = fmt delim item
555− f' | Arrays.Array _ <- item = f
435+ where f' | Arrays.Array _ <- item = f
556− | otherwise = fElem
436+ | otherwise = fElem
558−instance (FromField a, Typeable a) => FromField (Vector a) where
559− fromField f v = V.fromList . fromPGArray <$> fromField f v
561−instance (FromField a, Typeable a) => FromField (IOVector a) where
562− fromField f v = liftConversion . V.unsafeThaw =<< fromField f v
565instance FromField UUID where
439instance FromField UUID where
566 fromField f mbs =
440 fromField f mbs =
567− if typeOid f /= TI.uuidOid
441+ if typeOid f /= $(inlineTypoid TI.uuid)
568 then returnError Incompatible f ""
442 then returnError Incompatible f ""
569 else case mbs of
443 else case mbs of
570 Nothing -> returnError UnexpectedNull f ""
444 Nothing -> returnError UnexpectedNull f ""
@@ -573,26 +447,20 @@ instance FromField UUID where
573 Nothing -> returnError ConversionFailed f "Invalid UUID"
447 Nothing -> returnError ConversionFailed f "Invalid UUID"
574 Just uuid -> pure uuid
448 Just uuid -> pure uuid
576−-- | json, jsonb
450+-- | json
577instance FromField JSON.Value where
451instance FromField JSON.Value where
578− fromField f mbs = parseBS =<< fromFieldJSONByteString f mbs
452+ fromField f mbs =
579− where parseBS bs = case JSON.eitherDecodeStrict' bs of
453+ if typeOid f /= $(inlineTypoid TI.json)
580− Left err -> returnError ConversionFailed f err
581− Right val -> pure val
583−-- | Return the JSON ByteString directly
586−fromFieldJSONByteString :: Field -> Maybe ByteString -> Conversion ByteString
587−fromFieldJSONByteString f mbs =
588− if typeOid f /= TI.jsonOid && typeOid f /= TI.jsonbOid
589 then returnError Incompatible f ""
454 then returnError Incompatible f ""
590 else case mbs of
455 else case mbs of
591 Nothing -> returnError UnexpectedNull f ""
456 Nothing -> returnError UnexpectedNull f ""
592− Just bs -> pure bs
457+ Just bs ->
458+ case JSON.eitherDecodeStrict' bs of
459+ Left err -> returnError ConversionFailed f err
460+ Right val -> pure val
594-- | Parse a field to a JSON 'JSON.Value' and convert that into a
462-- | Parse a field to a JSON 'JSON.Value' and convert that into a
595−-- Haskell value using the 'JSON.FromJSON' instance.
463+-- Haskell value using 'JSON.fromJSON'.
597-- This can be used as the default implementation for the 'fromField'
465-- This can be used as the default implementation for the 'fromField'
598-- method for Haskell types that have a JSON representation in
466-- method for Haskell types that have a JSON representation in
@@ -600,66 +468,31 @@ fromFieldJSONByteString f mbs =
601-- The 'Typeable' constraint is required to show more informative
469-- The 'Typeable' constraint is required to show more informative
602-- error messages when parsing fails.
470-- error messages when parsing fails.
604−-- Note that @fromJSONField :: FieldParser ('Maybe' Foo)@ will return
605−-- @'Nothing'@ on the json @null@ value, and return an exception on SQL @null@
606−-- value. Alternatively, one could write @'optionalField' fromJSONField@
607−-- that will return @Nothing@ on SQL @null@, and otherwise will call
608−-- @fromJSONField :: FieldParser Foo@ and then return @'Just'@ the
609−-- result value, or return its exception. If one would
610−-- like to return @Nothing@ on both the SQL @null@ and json @null@ values,
611−-- one way to do it would be to write
612−-- @\\f mv -> 'Control.Monad.join' '<$>' optionalField fromJSONField f mv@
613fromJSONField :: (JSON.FromJSON a, Typeable a) => FieldParser a
471fromJSONField :: (JSON.FromJSON a, Typeable a) => FieldParser a
614fromJSONField f mbBs = do
472fromJSONField f mbBs = do
615 value <- fromField f mbBs
473 value <- fromField f mbBs
616− case JSON.ifromJSON value of
474+ case JSON.fromJSON value of
617− JSON.IError path err -> returnError ConversionFailed f $
475+ JSON.Error err -> returnError ConversionFailed f $
618− "JSON decoding error: " ++ (JSON.formatError path err)
476+ "JSON decoding error: " ++ err
619− JSON.ISuccess x -> pure x
477+ JSON.Success x -> pure x
621−-- | Compatible with the same set of types as @a@. Note that
622−-- modifying the 'IORef' does not have any effects outside
623−-- the local process on the local machine.
624−instance FromField a => FromField (IORef a) where
625− fromField f v = liftConversion . newIORef =<< fromField f v
627−-- | Compatible with the same set of types as @a@. Note that
628−-- modifying the 'MVar' does not have any effects outside
629−-- the local process on the local machine.
630−instance FromField a => FromField (MVar a) where
631− fromField f v = liftConversion . newMVar =<< fromField f v
633type Compat = PQ.Oid -> Bool
479type Compat = PQ.Oid -> Bool
635okText, okText', okBinary, ok16, ok32, ok64, okInt :: Compat
481okText, okText', okBinary, ok16, ok32, ok64, okInt :: Compat
636−okText = eq TI.nameOid \/ eq TI.textOid \/ eq TI.charOid
482+okText = $( mkCompats [ TI.name, TI.text, TI.char,
637− \/ eq TI.bpcharOid \/ eq TI.varcharOid
483+ TI.bpchar, TI.varchar ] )
638−okText' = eq TI.nameOid \/ eq TI.textOid \/ eq TI.charOid
484+okText' = $( mkCompats [ TI.name, TI.text, TI.char,
639− \/ eq TI.bpcharOid \/ eq TI.varcharOid \/ eq TI.unknownOid
485+ TI.bpchar, TI.varchar, TI.unknown ] )
640−okBinary = eq TI.byteaOid
486+okBinary = (== $( inlineTypoid TI.bytea ))
641−ok16 = eq TI.int2Oid
487+ok16 = (== $( inlineTypoid TI.int2 ))
642−ok32 = eq TI.int2Oid \/ eq TI.int4Oid
488+ok32 = $( mkCompats [TI.int2,TI.int4] )
643−ok64 = eq TI.int2Oid \/ eq TI.int4Oid \/ eq TI.int8Oid
489+ok64 = $( mkCompats [TI.int2,TI.int4,TI.int8] )
644#if WORD_SIZE_IN_BITS < 64
490#if WORD_SIZE_IN_BITS < 64
645okInt = ok32
491okInt = ok32
647okInt = ok64
493okInt = ok64
650−-- | eq and \/ are used to imlement what Macro stuff did,
651−-- i.e. mkCompats and inlineTypoid
652−eq :: PQ.Oid -> PQ.Oid -> Bool
657−(\/) :: (PQ.Oid -> Bool)
660−f \/ g = \x -> f x || g x
663doFromField :: forall a . (Typeable a)
496doFromField :: forall a . (Typeable a)
664 => Field -> Compat -> (ByteString -> Conversion a)
497 => Field -> Compat -> (ByteString -> Conversion a)
665 -> Maybe ByteString -> Conversion a
498 -> Maybe ByteString -> Conversion a
@@ -684,22 +517,10 @@ returnError mkErr f msg = do
684 (show (typeOf (undefined :: a)))
517 (show (typeOf (undefined :: a)))
687−-- | Construct a field parser from an attoparsec parser. An 'Incompatible' error is thrown if the
688−-- PostgreSQL oid does not match the specified predicate.
691−-- instance FromField Int16 where
692−-- fromField = attoFieldParser ok16 (signed decimal)
696−attoFieldParser :: forall a. (Typeable a)
520+atto :: forall a. (Typeable a)
697− => (PQ.Oid -> Bool)
521+ => Compat -> Parser a -> Field -> Maybe ByteString
698− -- ^ Predicate for whether the postgresql type oid is compatible with this parser
522+ -> Conversion a
700− -- ^ An attoparsec parser.
702−attoFieldParser types p0 f dat = doFromField f types (go p0) dat
523+atto types p0 f dat = doFromField f types (go p0) dat
704 go :: Parser a -> ByteString -> Conversion a
525 go :: Parser a -> ByteString -> Conversion a