协助描绘树或框指针结构

Question

我正在研究 SICP 的 Exercise 2.24：

Exercise 2.24. Suppose we evaluate the expression (list 1 (list 2 (list 3 4))). Give the result printed by the interpreter, the corresponding box-and-pointer structure, and the interpretation of this as a tree (as in figure 2.6).

并绘制框和指针为

 (1 (2 (3 4)))       ((2 (3 4)))
[*]---------------> [*]
 |                   |
 |                   |
 v                   v (2 (3 4))         ((3 4))
 1                  [*]---------------> [*]
                     |                   |
                     |                   |
                     v                   v (3 4)             (4)
                     2                  [*]---------------> [*]---------------> '()
                                         |                   |
                                         |                   |
                                         v                   v

和树

(1 (2 (3 4)))
   *
  / \
 /   \  (2 (3 4))
1     *
     / \
    /   \  (3 4)
   2     *
        / \
       /   \
      3     4

是否有任何解决方案可以描绘这种树或框指针结构？

一开始可能会很有帮助，因为立即想象结构并不容易。

Answer 1

当你使用 Racket 时，你可能需要 sdraw。例如，您可以通过 raco pkg install sdraw.

协助描绘树或框指针结构

Assistance to portray the tree or box-pointer strucure

emacs

scheme

sicp

racket