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Add escape-hatch custom error constructor #85

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Add escape-hatch custom error constructor #85

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5 changes: 4 additions & 1 deletion src/Data/Argonaut/Decode/Error.purs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
-- | Originally implemented in:
-- | Originally implemented in:
-- | https://github.com/garyb/purescript-codec-argonaut
module Data.Argonaut.Decode.Error where

Expand All @@ -15,6 +15,7 @@ data JsonDecodeError
| AtKey String JsonDecodeError
| Named String JsonDecodeError
| MissingValue
| CustomError String

derive instance eqJsonDecodeError :: Eq JsonDecodeError
derive instance ordJsonDecodeError :: Ord JsonDecodeError
Expand All @@ -28,6 +29,7 @@ instance showJsonDecodeError :: Show JsonDecodeError where
AtKey k e -> "(AtKey " <> show k <> " " <> show e <> ")"
Named s e -> "(Named " <> show s <> " " <> show e <> ")"
MissingValue -> "MissingValue"
CustomError e -> "(CustomError " <> e <> ")"

-- | Prints a `JsonDecodeError` as a readable error message.
printJsonDecodeError :: JsonDecodeError -> String
Expand All @@ -41,3 +43,4 @@ printJsonDecodeError err =
AtKey key inner -> " At object key \'" <> key <> "\':\n" <> go inner
Named name inner -> " Under '" <> name <> "':\n" <> go inner
MissingValue -> " No value was found."
CustomError e -> " " <> e