为什么我的 clojurescript 宏不起作用

Why is my clojurescript macro not working

我需要 when-not-empty-let 类似于 clojure/corewhen-let. So, I've just added not-empty call to when-let macro from clojure's source code 的宏:

(defmacro when-not-empty-let
  "bindings => binding-form test
  When test is not empty, evaluates body with binding-form bound to the value of test"
  [bindings & body]
  (.log js/console "check")
  (let [form (first bindings) tst (second bindings)]
    `(let [temp# ~tst]
       (when (not-empty temp#)
         (let [~form temp#]
           ~@body)))))

(也将 (bindings 0) 替换为 (first bindings),否则无法编译)

我是这样使用的:

(defn something
  []
  (when-not-empty-let [foo ["foo"]]
    (.log js/console foo)))

(something)

我得到以下输出:

undefined

check

我做错了什么?


使用 Clojure v1.9.0 构建,ClojureScript:v1.10.126,lein-cljsbuild:v1.1.7

在 Chrome v59.0.3071.115 中测试 Ubuntu。


更新: 重现问题的 jsbin(至少对我而言):https://jsbin.com/liluwer/1/edit?js,output

在浏览器的开发人员工具控制台中查看问题的输出。

来自ClojureScript docs

There is a strict rule for when you can use defmacro -- you can only use it in what we call a macro namespace, effectively forcing you to separate your compile time and runtime code.

错误是我试图在同一个命名空间中测试宏。