The problem here is that s/or is NOT a regex op and introduces a new level
of spec nesting. Try using s/alt (which IS a regex op) instead.
On Tuesday, May 16, 2017 at 11:34:10 PM UTC-5, Alexander Sedgwick wrote:
>
> I'm looking to better understand how nested cats work (now that just
> sounds funny).
>
> I've found that sometimes spec/cat will generate a nested list:
>
> ```clojure
> (gen/sample (s/gen (s/cat :start #{\a}
> :content (s/cat :nothing (s/? #{\^})
> :fruit (s/or
> :apples (s/+ (s/cat :skin #{\s}
>
> :flesh #{\f}
>
> :core #{\c}))
>
> :bananas (s/+ #{\b})))
> :end #{\z})) 5)
> ```
> -> ((\a \^ (\s \f \c) \z) ... (\a \^ (\b \b) \z))
>
> Given the sample output we can assume this validate call will be false
> (provided flat list):
>
> ```clojure
> (s/valid? (s/cat :start #{\a}
> :content (s/cat :nothing (s/? #{\^})
> :fruit (s/or :apples (s/+
> (s/cat :skin #{\s}
>
> :flesh #{\f}
>
> :core #{\c}))
> :bananas (s/+
> #{\b})))
> :end #{\z}) [\a \^ \s \f \c \z])
> ```
> -> false
>
> I thought the s/spec function would need to be used to define nested
> structures (s/spec (s/cat ...)).
>
> Is this expected behavior or is there a better approach for working with
> flat lists?
>
> Thanks!
>
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