diff options
Diffstat (limited to 'Types/MetaData.hs')
| -rw-r--r-- | Types/MetaData.hs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Types/MetaData.hs b/Types/MetaData.hs index 449548d53..a62dd7ed0 100644 --- a/Types/MetaData.hs +++ b/Types/MetaData.hs @@ -44,14 +44,32 @@ import Common import Utility.Base64 import Utility.QuickCheck +import qualified Data.Text as T import qualified Data.Set as S import qualified Data.Map as M +import qualified Data.HashMap.Strict as HM import Data.Char import qualified Data.CaseInsensitive as CI +import Data.Aeson newtype MetaData = MetaData (M.Map MetaField (S.Set MetaValue)) deriving (Show, Eq, Ord) +instance ToJSON MetaData where + toJSON (MetaData m) = object $ map go (M.toList m) + where + go (MetaField f, s) = (T.pack (CI.original f), toJSON s) + +instance FromJSON MetaData where + parseJSON (Object o) = do + l <- HM.toList <$> parseJSON (Object o) + MetaData . M.fromList <$> mapM go l + where + go (t, l) = case mkMetaField (T.unpack t) of + Left e -> fail e + Right f -> (,) <$> pure f <*> parseJSON l + parseJSON _ = fail "expected an object" + {- A metadata value can be currently be set (True), or may have been - set before and we're remembering it no longer is (False). -} newtype CurrentlySet = CurrentlySet Bool @@ -64,6 +82,13 @@ newtype MetaField = MetaField (CI.CI String) data MetaValue = MetaValue CurrentlySet String deriving (Read, Show) +instance ToJSON MetaValue where + toJSON (MetaValue _ v) = toJSON v + +instance FromJSON MetaValue where + parseJSON (String v) = return $ MetaValue (CurrentlySet True) (T.unpack v) + parseJSON _ = fail "expected a string" + {- Metadata values compare and order the same whether currently set or not. -} instance Eq MetaValue where MetaValue _ a == MetaValue _ b = a == b |