在 Clojure 中调试?

问题描述

在使用 repl 时调试 Clojure 代码的最佳方法是什么?

What are best ways to Debug Clojure code, while using the repl?

推荐答案

还有 dotrace，它允许您查看所选函数的输入和输出.

There's also dotrace, which allows you to look at the inputs and outputs of selected functions.

(use 'clojure.contrib.trace)
(defn fib[n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
(dotrace [fib] (fib 3))

产生输出:

TRACE t4425: (fib 3)
TRACE t4426: |    (fib 2)
TRACE t4427: |    |    (fib 1)
TRACE t4427: |    |    => 1
TRACE t4428: |    |    (fib 0)
TRACE t4428: |    |    => 0
TRACE t4426: |    => 1
TRACE t4429: |    (fib 1)
TRACE t4429: |    => 1
TRACE t4425: => 2
2

在 Clojure 1.4 中，dotrace 已经移动:

你需要依赖:

[org.clojure/tools.trace "0.7.9"]
(require 'clojure.tools.trace)

并且您需要将 ^:dynamic 添加到函数定义中

And you need to add the ^:dynamic to the function definition

(defn ^:dynamic fib[n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))

然后鲍勃又是你的叔叔了:

Then Bob is once again your uncle:

(clojure.tools.trace/dotrace [fib] (fib 3))

TRACE t4328: (fib 3)
TRACE t4329: | (fib 2)
TRACE t4330: | | (fib 1)
TRACE t4330: | | => 1
TRACE t4331: | | (fib 0)
TRACE t4331: | | => 0
TRACE t4329: | => 1
TRACE t4332: | (fib 1)
TRACE t4332: | => 1
TRACE t4328: => 2

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