当结果是一个函数时，无法使测试为真（编译时出现语法错误.... 没有这样的 var:...）

Question

Happens when I want to test a function where the result is another function. I have something like this:

ns flexsearch.core

(defn init [{:keys [tokenizer split indexer filter] :as options}]
  (let [encoder (get-encoder (:encoder options))]
    (assoc (merge {:ids {} :data {}} options)
           :indexer (get-indexer indexer)
           :encoder encoder
           :tokenizer (if (fn? tokenizer) tokenizer #(string/split % (or split #"\W+")))
           :filter (set (mapv encoder filter)))))

And in the test ns:

ns flexsearch.core-test
[flexsearch.core :as f]

(def split #"\W+")

(is (= (f/init {:tokenizer false :split split :indexer :forward :filter #{"and" "or"}})
         {:ids {},
          :data {},
          :tokenizer f/init/fn--14976,
          :split #"\W+",
          :indexer f/index-forward,
          :filter #{"or" "and"},
          :encoder f/encoder-icase}))

the result in the repl is:

{:ids {},
 :data {},
 :tokenizer #function[flexsearch.core/init/fn--14976],
 :split #"\W+",
 :indexer #function[flexsearch.core/index-forward],
 :filter #{"or" "and"},
 :encoder #function[flexsearch.core/encoder-icase]}

I know that I have to put f/index-forward instead of the result of the repl [flexsearch.core/index-forward], but it doesn't work with f/init/fn--14976 (No such var: f/init/fn--14976)

I supouse that is a trick with the vars but i dont know how it really works. Any reading you can provide i will be gratefull

---EDIT--- The f/index-forward and f/encoder-icase notations works fine.

---EDIT 2--- i've defined:

(defn spliter [split]   (fn [x] (string/split x (or split #"\W+"))))

and used it on:

(defn init [{:keys [tokenizer split indexer filter] :as options}]
  (let [encoder (get-encoder (:encoder options))]
    (assoc (merge {:ids {} :data {}} options)
           :indexer (get-indexer indexer)
           :encoder encoder
           :tokenizer (if (fn? tokenizer) tokenizer (spliter split))
           :filter (set (mapv encoder filter)))))

the I get a similar ":tokenizer #function[flexsearch.core/spliter/fn--34857]," that I used in the test and it also failed –

Answer 1

I think the "No such var" error is happening because the tokenizer is an anonymous function.

If you had the default tokenizer defined as a non-anonymous function in flexsearch.core and then used that name in the test, it would work.

However, in general, you cannot compare two functions for equality - as @cfrick says. When you are comparing maps, where some of the values are functions, you are still comparing functions.