Decoding.hs

-- Note: this is an automatically generated file. Do not edit.
-- | Decoding functions for JSON data

module Hydra.Json.Decoding where
import qualified Hydra.Ast as Ast
import qualified Hydra.Coders as Coders
import qualified Hydra.Core as Core
import qualified Hydra.Error.Checking as Checking
import qualified Hydra.Error.Core as ErrorCore
import qualified Hydra.Error.Packaging as ErrorPackaging
import qualified Hydra.Errors as Errors
import qualified Hydra.Graph as Graph
import qualified Hydra.Json.Model as Model
import qualified Hydra.Haskell.Lib.Eithers as Eithers
import qualified Hydra.Haskell.Lib.Maps as Maps
import qualified Hydra.Haskell.Lib.Optionals as Optionals
import qualified Hydra.Haskell.Lib.Strings as Strings
import qualified Hydra.Packaging as Packaging
import qualified Hydra.Parsing as Parsing
import qualified Hydra.Paths as Paths
import qualified Hydra.Query as Query
import qualified Hydra.Relational as Relational
import qualified Hydra.Tabular as Tabular
import qualified Hydra.Testing as Testing
import qualified Hydra.Topology as Topology
import qualified Hydra.Typed as Typed
import qualified Hydra.Typing as Typing
import qualified Hydra.Util as Util
import qualified Hydra.Validation as Validation
import qualified Hydra.Variants as Variants
import Prelude hiding  (Enum, Ordering, decodeFloat, encodeFloat, fail, map, pure, sum)
import qualified Data.Scientific as Sci
import qualified Data.Map as M
-- | Decode a JSON array using a decoder for elements
decodeArray :: (Model.Value -> Either String t0) -> Model.Value -> Either String [t0]
decodeArray decodeElem x =
    case x of
      Model.ValueArray v0 -> Eithers.mapList decodeElem v0
      _ -> Left "expected an array"
-- | Decode a JSON boolean value
decodeBoolean :: Model.Value -> Either String Bool
decodeBoolean x =
    case x of
      Model.ValueBoolean v0 -> Right v0
      _ -> Left "expected a boolean"
-- | Decode a required field from a JSON object
decodeField :: (t0 -> Either String t1) -> String -> M.Map String t0 -> Either String t1
decodeField decodeValue name m =
    Eithers.bind (decodeOptionalField decodeValue name m) (\mf -> Optionals.cases mf (Left (Strings.cat2 "missing field: " name)) (\f -> Right f))
-- | Decode a JSON object value to a name-keyed map. Field order is not preserved; decoding looks fields up by name.
decodeObject :: Model.Value -> Either String (M.Map String Model.Value)
decodeObject x =
    case x of
      Model.ValueObject v0 -> Right (Maps.fromList v0)
      _ -> Left "expected an object"
-- | Decode an optional field from a JSON object
decodeOptionalField :: Ord t3 => ((t0 -> Either t1 t2) -> t3 -> M.Map t3 t0 -> Either t1 (Maybe t2))
decodeOptionalField decodeValue name m =
    Optionals.cases (Maps.lookup name m) (Right Nothing) (\v -> Eithers.map (\x -> Just x) (decodeValue v))
-- | Decode a JSON string value
decodeString :: Model.Value -> Either String String
decodeString x =
    case x of
      Model.ValueString v0 -> Right v0
      _ -> Left "expected a string"