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fix: maybe

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This commit is contained in:
orion 2024-05-14 15:09:00 -05:00
parent ad72971f8b
commit 5e75b0b230
Signed by: orion
GPG Key ID: 6D4165AE4C928719
1 changed files with 11 additions and 3 deletions
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14
src/Data.CBOR.purs
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@ -2,20 +2,21 @@ module Data.CBOR where
import Prelude
import Control.Monad.Error.Class (liftMaybe)
import Control.Monad.Error.Class (liftMaybe, try)
import Control.Monad.Except (ExceptT(..), withExcept)
import Control.Monad.Except.Trans (runExceptT)
import Data.Array as Array
import Data.DateTime (DateTime)
import Data.Either (Either(..))
import Data.Either (Either(..), isRight)
import Data.Foldable (class Foldable)
import Data.FoldableWithIndex (foldlWithIndex)
import Data.JSDate (JSDate)
import Data.JSDate as JSDate
import Data.Map (Map)
import Data.Maybe (Maybe(..))
import Data.Symbol (class IsSymbol, reflectSymbol)
import Data.Traversable (traverse)
import Foreign (F, Foreign, ForeignError(..), readArray, unsafeReadTagged, unsafeToForeign)
import Foreign (F, Foreign, ForeignError(..), readArray, readNullOrUndefined, unsafeReadTagged, unsafeToForeign)
import Foreign.Index (readProp)
import JS.BigInt (BigInt)
import JS.Map (Map) as JS
@ -53,6 +54,13 @@ else instance ReadCBOR a => ReadCBOR (Array a) where
readCBOR a = do
raws :: Array Foreign <- readArray a
traverse readCBOR raws
else instance ReadCBOR a => ReadCBOR (Maybe a) where
readCBOR a = do
isNull <- isRight <$> try (readNullOrUndefined a)
if isNull then
pure Nothing
else
Just <$> readCBOR @a a
else instance (ReadCBOR v) => ReadCBOR (JS.Map String v) where
readCBOR map = do
map' :: JS.Map String Foreign <- unsafeReadTagged "Map" map