;; You should have received a copy of the GNU General Public License
;; along with JSCL. If not, see <http://www.gnu.org/licenses/>.
+(/debug "loading sequence.lisp!")
+
(defun not-seq-error (thing)
(error "`~S' is not of type SEQUENCE" thing))
(defun copy-seq (sequence)
(subseq sequence 0))
+
+
+;;; Reduce (based on SBCL's version)
+
+(defun reduce (function sequence &key key from-end (start 0) end (initial-value nil ivp))
+ (let ((key (or key #'identity))
+ (end (or end (length sequence))))
+ (if (= end start)
+ (if ivp initial-value (funcall function))
+ (macrolet ((reduce-list (function sequence key start end initial-value ivp from-end)
+ `(let ((sequence
+ ,(if from-end
+ `(reverse (nthcdr ,start ,sequence))
+ `(nthcdr ,start ,sequence))))
+ (do ((count (if ,ivp ,start (1+ ,start))
+ (1+ count))
+ (sequence (if ,ivp sequence (cdr sequence))
+ (cdr sequence))
+ (value (if ,ivp ,initial-value (funcall ,key (car sequence)))
+ ,(if from-end
+ `(funcall ,function (funcall ,key (car sequence)) value)
+ `(funcall ,function value (funcall ,key (car sequence))))))
+ ((>= count ,end) value)))))
+ (if from-end
+ (reduce-list function sequence key start end initial-value ivp t)
+ (reduce-list function sequence key start end initial-value ivp nil))))))