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updated documentation strings to include empty tag in a union #2625

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updated documentation strings to include empty tag in a union #2625

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51de0d6
updated documentation strings to include the case of empty tag in a u…
Jan 4, 2025
b779323
Merge branch 'main' into main
winitzki Jan 5, 2025
ad2f8f9
docs for union decoder: changed Maybe to Either and the type of Unrea…
Jan 5, 2025
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10 changes: 8 additions & 2 deletions dhall/src/Dhall/Marshal/Encode.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -943,6 +943,7 @@ encodeFieldWith name encodeType = RecordEncoder $ Dhall.Map.singleton name encod
data Status = Queued Natural
| Result Text
| Errored Text
| Unreachable
:}

And assume that we have the following Dhall union that we would like to
Expand All @@ -951,6 +952,7 @@ data Status = Queued Natural
> < Result : Text
> | Queued : Natural
> | Errored : Text
> | Unreachable
> >.Result "Finish successfully"

Our encoder has type 'Encoder' @Status@, but we can't build that out of any
Expand All @@ -963,11 +965,13 @@ injectStatus = adapt >$< unionEncoder
( encodeConstructorWith "Queued" inject
>|< encodeConstructorWith "Result" inject
>|< encodeConstructorWith "Errored" inject
>|< encodeConstructorWith "Unreachable" inject
)
where
adapt (Queued n) = Left n
adapt (Result t) = Right (Left t)
adapt (Errored e) = Right (Right e)
adapt (Errored e) = Right (Right (Left e))
adapt Unreachable = Right (Right (Right ()))
:}

Or, since we are simply using the `ToDhall` instance to inject each branch, we could write
Expand All @@ -978,11 +982,13 @@ injectStatus = adapt >$< unionEncoder
( encodeConstructor "Queued"
>|< encodeConstructor "Result"
>|< encodeConstructor "Errored"
>|< encodeConstructor "Unreachable"
)
where
adapt (Queued n) = Left n
adapt (Result t) = Right (Left t)
adapt (Errored e) = Right (Right e)
adapt (Errored e) = Right (Right (Left e))
adapt Unreachable = Right (Right (Right ()))
:}

-}
Expand Down