;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
-(in-package :gacela)
+(when (not (find-package 'gacela))
+ (make-package 'gacela :nicknames '(gg) :use '(lisp)))
+
+(eval-when (eval) (in-package 'gacela :nicknames '(gg) :use '(lisp)))
(defconstant INFINITY MOST-POSITIVE-LONG-FLOAT)
(t (power (* p 2) n)))))
(power 1 n)))
+(defmacro secure-block (output-stream &rest forms)
+ (let ((error-handler #'si::universal-error-handler))
+ `(block secure
+ (defun si::universal-error-handler (error-name correctable function-name continue-format-string error-format-string &rest args)
+ ,(when output-stream
+ `(write-line
+ (cond ((eq error-name :WRONG-TYPE-ARGUMENT) (string error-name))
+ (t error-format-string))
+ ,output-stream))
+ (setf (symbol-function 'si::universal-error-handler) ,error-handler)
+ (return-from secure))
+ (let (result-eval)
+ (setq result-eval (progn ,@forms))
+ (setf (symbol-function 'si::universal-error-handler) ,error-handler)
+ result-eval))))
+
+(defmacro persistent-let (name vars &rest forms)
+ (labels ((get-vars (vars)
+ (cond ((null vars) nil)
+ (t (cons (if (consp (car vars)) (caar vars) (car vars))
+ (get-vars (cdr vars)))))))
+
+ `(let ,(cond ((functionp name)
+ (let ((old-vars (funcall name)))
+ (cond ((equal (get-vars vars) (get-vars old-vars)) old-vars)
+ (t vars))))
+ (t vars))
+ (defun ,name ()
+ ,(let ((lvars (get-vars vars)))
+ `(mapcar (lambda (x y) (list x y)) ',lvars ,(cons 'list lvars))))
+ ,@forms)))
+
;Geometry
(defun dotp (dot)
(match-pattern dot '(0 0)))