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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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10
Task/Inverted-syntax/Common-Lisp/inverted-syntax-1.lisp Normal file
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(eval-when (:compile-toplevel :load-toplevel :execute)
(defun unrev-syntax (form)
(cond
((atom form) form)
((null (cddr form)) form)
(t (destructuring-bind (oper &rest args) (reverse form)
`(,oper ,@(mapcar #'unrev-syntax args)))))))
(defmacro rprogn (&body forms)
`(progn ,@(mapcar #'unrev-syntax forms)))

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Task/Inverted-syntax/Common-Lisp/inverted-syntax-2.lisp Normal file
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(eval-when (:compile-toplevel :load-toplevel :execute)
(defun unrev-syntax (form)
(cond
((atom form) form) ;; atom: leave alone
((null (cdr form)) form) ;; one-element form: leave alone
((null (cddr form)) ;; two-element form: swap
(destructuring-bind (arg oper) form
`(,oper ,(unrev-syntax arg))))
(t ;; two or more args: swap last two, add others in reverse
(destructuring-bind (arg1 oper &rest args) (reverse form)
`(,oper ,(unrev-syntax arg1) ,@(mapcar #'unrev-syntax args)))))))
(defmacro rprogn (&body forms)
`(progn ,@(mapcar #'unrev-syntax forms)))