Comments (9)
Ha, we posted at the same time.
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There isn't anything in the index for that position, so it is considered a failure. I don't think I have explicit documentation for this behaviour, I'll add some in.
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So, what I want to do is, go down
into an object, then do a foldCursor
(or a rightwardSnoc
). I'm perfectly happy for that to just give me the initial value of the accumulator if the object is empty. What is the alternative? If I check for failure on the down
I still don't know why that is, it could be because it's a text or numeric field.
Or, rephrased, how can I check that my cursor is currently pointed at an object without parsing it all into a Json
?
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Which, looking at the code just now, is exactly what your listAt
is trying to do. So, if you listAt
and the cursor is sitting in front of a text or numeric field, it will result in an empty list, which seems slight counter-intuitive.
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That listAt
behaviour seems a bit more 'bug' than 'counter-intuitive', so thanks for that !
Currently there isn't a direct way to check if you're currently looking at an object or other specific type, without going to the Json
structure then using the lenses and prisms to nose around. That's a useful feature though and wouldn't be difficult to include.
To keep you moving, you could take advantage of the Alt
instance for Decoder
to combine alternatives for what may exist at a given cursor position. Until I fix the listAt
this will mean you need to be aware of ordering considerations, which isn't awesome.
Alternatively, you are able to use the functions from the library that powers the cursor itself hw-json
. Specifically from the module HaskellWorks.Data.Json.Type.
jsonTypeAt (unJCurs cursor) :: Maybe JsonType
Using Alt
would be my first preference though. Does any of that help?
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It seems that exposing jsonTypeAt
is what I want.
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I'll leave this open until I've patched listAt
others if I find more
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@mankyKitty I've posted a patch.
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Fixed by #39
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Related Issues (20)
- Waargonaut.Decode.either's document or implementation maybe wrong HOT 1
- CommaSeparated's _Empty Prism doesn't obey Prism law
- Default / example parser? HOT 2
- Restrictive upper bounds for generics-sop-0.40.1 HOT 2
- Encoder mapLikeObj API thoughts HOT 1
- Uppercase HeXDigit's aren't interpreted correctly
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