通用Lisp库用于漂亮印刷？例如漂亮打印嵌套哈希表 [英] Common Lisp Library for Pretty Printing? e.g. pretty print a nested hash table

问题描述

我是普通的Lisp新手。是否有一个CL库可用于漂亮的打印集合（在我的情况下是嵌套哈希表）？

I am new to common lisp. Is there a CL library to pretty print collections, in my case, nested hash tables?

推荐答案

如果您考虑自己编写，则可以使用打印对象。它不是实现独立的对象，但至少在LispWorks和SBCL中有效。

If you consider writing it yourself here is a starting point using print-object. It is not implementation independend, but this works at least in LispWorks and SBCL.

(defmethod print-object ((object hash-table) stream)
  (format stream "#HASH{~{~{(~a : ~a)~}~^ ~}}"
          (loop for key being the hash-keys of object
                using (hash-value value)
                collect (list key value))))

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