Using s/& and Mark’s fdef does “work” but the failure messages seem misleading:
boot.user=> (f 2 :even 4)
nil
boot.user=> (f 2 :even 3)
clojure.lang.ExceptionInfo: Call to #'boot.user/f did not conform to spec:
val: () fails at: [:args :options] predicate: (& (*
(cat :clojure.spec/k keyword? :clojure.spec/v :clojure.spec/any))
:clojure.spec/kvs->map (keys :opt-un [:boot.user/even])), Insufficient input
:clojure.spec/args (2 :even 3)
:clojure.spec/failure :instrument-check-failed
Why Insufficient input here? Why doesn’t it point at 3 failing the ::even or
even? predicate?
boot.user=> (f 2 :even 4 :odd 5)
clojure.lang.ExceptionInfo: Call to #'boot.user/f did not conform to spec:
val: {:even 4, :odd 5} fails at: [:args :options]
predicate: (fn [m] (not (contains? m :odd)))
:clojure.spec/args (2 :even 4 :odd 5)
:clojure.spec/failure :instrument-check-failed
This is fine: we see it fails the specific predicate provided.
boot.user=> (f 2 :even 4 :o 5)
nil
Sean Corfield -- (970) FOR-SEAN -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
On 6/29/16, 5:07 PM, "Alex Miller" <[email protected] on behalf of
[email protected]> wrote:
As soon as you introduce the s/and, you have dropped out of regex land and into
a predicate. You are then matching something in a new nested regex inside the
and like: [[::even 4]]. To stay within the top-level regex and supply extra
predicates, use s/& instead:
(s/def ::options
(s/& (s/keys* :opt-un [::even]) (fn [m] (not (contains? m :odd)))))
user=> (s/conform ::options [:even 2])
{:even 2}
user=> (s/conform ::options [:even 2 :foo 5])
{:even 2, :foo 5}
user=> (s/explain ::options [:even 3])
val: () fails spec: :user/options predicate: (& (* (cat :clojure.spec/k
keyword? :clojure.spec/v :clojure.spec/any)) :clojure.spec/kvs->map (keys
:opt-un [:user/even])), Insufficient input
user=> (s/explain ::options [:even 2 :odd 3])
val: {:even 2, :odd 3} fails spec: :user/options predicate: (fn [m] (not
(contains? m :odd)))
On Wednesday, June 29, 2016 at 5:19:09 PM UTC-5, puzzler wrote:
I'm having trouble spec'ing out something like this, a function that takes an
integer as an input followed by a series of optional keyworded args. :even is
an allowed optional keyword, but we definitely want to forbid :odd as an
optional keyword.
(s/def ::even even?)
(s/def ::options
(s/and
(s/keys* :opt-un [::even])
(fn [m] (not (contains? m :odd)))))
(defn f [n & {:as options}] nil)
(s/fdef f :args (s/cat :integer int? :options ::options))
(stest/instrument `f)
This doesn't work at all and gives all sorts of errors when f is called with
any input. I believe it is because the use of s/and in the definition of
::options interferes with the ability of ::options to be "flattened" into the
s/cat definition.
My reasoning:
::options correctly validates [:even 2] and rejects [:even 2 :odd 3] and [:even
3].
If I omit the s/and and the second clause so that it reads:
(s/def ::options (s/keys* :opt-un [::even]))
this also behaves as expected.
So my conclusion is that the s/and is interfering with the ability of s/keys*
to sit within the s/cat definition.
How does one solve this problem?
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