Very cool! Excellent work.
On Monday, December 11, 2017 at 7:23:38 AM UTC-7, OHTA Shogo wrote:
>
> Hi, all
>
> I’m happy to announce the first release of Pinpointer, yet another
> implementation of spec error reporter based on a precise error analysis.
>
> - https://github.com/athos/Pinpointer
>
> Pinpointer provides functionalities very similar to the existing spec
> error reporters (eg. Expound[1], Inspectable[2] etc.), that is, reporting
> spec errors in a more human-readable way.
>
> [1] https://github.com/bhb/expound
> [2] https://github.com/jpmonettas/inspectable
>
> Unlike those libraries, which analyze spec errors using several
> heuristics, Pinpointer performs a systematic error analysis traversing a
> pair of the spec and the input. This makes it possible to report the error
> even in complicated cases where s/conformer would transform the input
> value, like the following:
>
> => (require '[pinpointer.core :as p] '[clojure.spec.alpha :as s])
> => (p/pinpointer (s/and string? (s/conformer seq) (s/* #{\a})) "aabaa")
> Detected 1 spec error:
> --
> (1/1)
>
>
> Cause: (\a \a \b \a \a)
> ^^
> Expected: #{\a}
>
>
>--- This comes originally from ---
>
>
> Original: "aabaa"
>^^^
> Spec
> Applied: (s/and string? (s/conformer seq) (s/* #{\a}))
>
>
> --
> nil
> user=>
>
>
> (BTW the above example is just a demo for Pinpointer's capability, and it
> doesn't mean to encourage you to write specs like that.)
>
> On the other hand, one of the downsides of the library is that Pinpointer
> has to know in advance the behaviors of the spec macros involved in a spec
> form for its error analysis. Note also that, Pinpointer occasionally uses
> eval under the hood (at least for now), so it’s basically intended to be
> used for development purpose only.
>
> I hope you’ll like it :)
>
> Thanks,
> Shogo
>
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