RosettaCodeData/Task/Inverted-syntax/EchoLisp/inverted-syntax.l

24 lines
475 B
Common Lisp

;; use reader macros to transform (a OP b) into (OP b a)
(lib 'match)
(define-macro invert-= (a <- b) (set! b a))
(define-macro invert-IF (a 'IF b) (when b a))
(define raining #f)
(#t <- raining)
raining
#t
('umbrella-need IF raining)
umbrella-need
(#f <- raining)
('umbrella-need IF raining)
#f
;; debug mode
(debug 3)
('umbrella-need IF raining)
💡 [0] invert-IF ('umbrella-need IF raining)
compiled :: (#when raining 'umbrella-need)