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Is there a "tree structure editor" for Lisp?

I heard that S-expressions can be represented as trees; like (f 1 (g 2) 3)how

      .
 .  .  .    .
f  1   .      3          [first level]
      g  2               [second level]

Is there an editor (preferably free) for directly editing this type of structure? This will

  • Avoid "all these parentheses"
  • Show the elegance I understood in lisp.
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4 answers

S-expressions are a tree, not the other way around. Your example formatted with newlines:

(f 1
   (g 2)
   3)

It represents the following cons tree:

    +---+---+   +---+---+   +---+---+   +---+---+
--->| f | ----->| 1 | ----->| ¦ | ----->| 3 |NIL|
    +---+---+   +---+---+   + ¦ +---+   +---+---+
                              v
                            +---+---+   +---+---+
                            | g | ----->| 2 |NIL|
                            +---+---+   +---+---+

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+5

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ParEdit emacs .

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Gingko as a Tree Structure editor for lisp

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