CODEWITHSUNDEEP
clojureclojure-java-interopedn
ppp456878
ppp456878

Reputation: 155

How do I pass custom parameter to edn reader?

I following clojure code 

(defn reverse-reader [coll]
    (assert (coll? coll) "you can only reverse collections")
    (reverse coll)
)

(def custom-readers {'demo/reverse reverse-reader})

(defn getContent
    [filename myCustomObject]
    (edn/read-string
        {:readers custom-readers}
        (slurp filename))
)

I am passing following EDN file

{
    :a 1
    :b [1 2 3 4 5]
    :c #demo/reverse [5 4 3 2 1]
}

My question is: When I call (getContent "ednfilepath" myCustomObject), reverse-reader gets called with collection defined in EDN... how can I pass myCustomObject from getContent to function reverse-reader ?

Thanks for help in advance.

Upvotes: 0

Views: 144

Answers (1)

Lee
Lee

Reputation: 144136

Based on your comment it looks like you want to add a parameter to reverse-reader and create a new function as the tag reader in getContent:

(defn reverse-reader [coll custom]
  ...)

(defn get-custom-readers [custom]
  {'demo/reverse (fn [c] (reverse-reader c custom))})

(defn getContent
    [filename myCustomObject]
    (edn/read-string
        {:readers (get-custom-readers myCustomObject])
        (slurp filename)))

Upvotes: 1

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