Generate from regular expression with Plumatic Schema generators

Question

Regexes seem to be accepted schemas:

(require '[schema.core :as schema])

(schema/validate #"^..$" "hi") ; => "hi"

But schema-generators can't seem to generate from them:

(require '[schema-generators.generators :as gen])

(gen/generate #"^..$")
; 1. Unhandled java.lang.RuntimeException
;    You must provide a leaf generator for
;    schema.spec.leaf.LeafSpec@3d398cfd

Is it possible to work around this in some way?

Answer 1

If we use the miner/strgen library we can indeed work up a solution:

(require '[schema.core  :as schema]
         '[miner.strgen :as strgen]
         '[schema-generators.generators :as gen])

(def two-char #"^..$")
(schema/validate two-char "hi") ; => "hi"

(gen/generate two-char {two-char (strgen/string-generator #"^..$")})
; => "x["

Though it should be noted that this only provides a generator for the regex #"^..$" in perticular and not regular expressions in general. We need a better solution, perhaps extend some protocol somewhere.