Tassilo!
Thank you very much, really grand job!
By the way, I was preparing this example for students. So, you've done
all the work for me! :)
Best regards,
Ru
On 26 сен, 22:31, Tassilo Horn <[email protected]> wrote:
> Hi again,
>
> just for the fun of doing it, here's a recursive version of infix:
>
> --8<---------------cut here---------------start------------->8---
> (defmacro infix [x]
> (if (sequential? x)
> `(~(second x) (infix ~(first x)) (infix ~(nth x 2)))
> x))
> --8<---------------cut here---------------end--------------->8---
>
> That works fine no matter if you use vectors or lists, because I simply
> pick the operator and the 2 args manually.
>
> I think it's educational to follow a complete macroexpansion process.
> Here's an example:
>
> --8<---------------cut here---------------start------------->8---
> (let [a 3, b 2, c 3]
> (infix ((a * b) + [c * c])))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (infix (a * b)) (infix [c * c])))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (* (infix a) (infix b)) (infix [c * c])))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (* a (infix b)) (infix [c * c])))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (* a b) (infix [c * c])))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (* a b) (* (infix c) (infix c))))
>
> Expands to:
> (let* [a 3 b 2 c 3]
> (+ (* a b) (* c (infix c))))
>
> Finally, expands to:
> (let* [a 3 b 2 c 3]
> (+ (* a b) (* c c)))
> --8<---------------cut here---------------end--------------->8---
>
> HTH,
> Tassilo
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