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Implement better path and type reporting in error messages #219
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…ion to invalid value path errors
…g for slightly cleaner code
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Resolves #165
This PR improves the error messaging in
Unboxto show the full path through the JSON being parsed so that it's obvious where the error is happening.This implementation differs slightly from the one proposed in that issue, in that it uses plain dot syntax for array indices instead of subscripting (
thing.2.propertyinstead ofthing[2].property). It shouldn't be hard to change this if subscripting is desired, but I used dot syntax to stay in sync with unbox's keypath syntax for querying into arrays, which looks like it uses dot syntax.I've also added type information to some of the errors, so that if there's a type unboxing error, you can know exactly what types are being used and add the appropriate protocol conformances to make them work if the JSON data is correct.
Tests have also been added for all the cases I could think of that exercise these new error enhancements.
I hope this helps! Let me know if there's any issues. I'd love to get this integrated quickly :)