(while (consp (cdr x))
(pop x))
x))))
-
- (define-compiler-macro mapcon (&whole form fn seq &rest rest)
- (if (and (fboundp 'mapcon)
- (subrp (symbol-function 'mapcon)))
- form
- (if rest
- `(let (res
- (args (list ,seq ,@rest))
- p)
- (while (not (memq nil args))
- (push (apply ,fn args) res)
- (setq p args)
- (while p
- (setcar p (cdr (pop p)))
- ))
- (apply (function nconc) (nreverse res)))
- `(let (res
- (arg ,seq))
- (while arg
- (push (funcall ,fn arg) res)
- (setq arg (cdr arg)))
- (apply (function nconc) (nreverse res))))))
-
- (define-compiler-macro union (&whole form list1 list2)
- (if (and (fboundp 'union)
- (subrp (symbol-function 'union)))
- form
- `(let ((a ,list1)
- (b ,list2))
- (cond ((null a) b)
- ((null b) a)
- ((equal a b) a)
- (t
- (or (>= (length a) (length b))
- (setq a (prog1 b (setq b a))))
- (while b
- (or (memq (car b) a)
- (push (car b) a))
- (pop b))
- a)))))
)
;; If we are building w3 in a different directory than the source