;;; function call.
(defvar *multiple-value-p* nil)
-;; A very simple defstruct built on lists. It supports just slot with
-;; an optional default initform, and it will create a constructor,
-;; predicate and accessors for you.
-(defmacro def!struct (name &rest slots)
- (unless (symbolp name)
- (error "It is not a full defstruct implementation."))
- (let* ((name-string (symbol-name name))
- (slot-descriptions
- (mapcar (lambda (sd)
- (cond
- ((symbolp sd)
- (list sd))
- ((and (listp sd) (car sd) (cddr sd))
- sd)
- (t
- (error "Bad slot description `~S'." sd))))
- slots))
- (predicate (intern (concat name-string "-P"))))
- `(progn
- ;; Constructor
- (defun ,(intern (concat "MAKE-" name-string)) (&key ,@slot-descriptions)
- (list ',name ,@(mapcar #'car slot-descriptions)))
- ;; Predicate
- (defun ,predicate (x)
- (and (consp x) (eq (car x) ',name)))
- ;; Copier
- (defun ,(intern (concat "COPY-" name-string)) (x)
- (copy-list x))
- ;; Slot accessors
- ,@(with-collect
- (let ((index 1))
- (dolist (slot slot-descriptions)
- (let* ((name (car slot))
- (accessor-name (intern (concat name-string "-" (string name)))))
- (collect
- `(defun ,accessor-name (x)
- (unless (,predicate x)
- (error "The object `~S' is not of type `~S'" x ,name-string))
- (nth ,index x)))
- ;; TODO: Implement this with a higher level
- ;; abstraction like defsetf or (defun (setf ..))
- (collect
- `(define-setf-expander ,accessor-name (x)
- (let ((object (gensym))
- (new-value (gensym)))
- (values (list object)
- (list x)
- (list new-value)
- `(progn
- (rplaca (nthcdr ,',index ,object) ,new-value)
- ,new-value)
- `(,',accessor-name ,object)))))
- (incf index)))))
- ',name)))
-
-
;;; Environment
(def!struct binding
--- /dev/null
+;;; defstruct.lisp ---
+
+;; JSCL is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; JSCL is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with JSCL. If not, see <http://www.gnu.org/licenses/>.
+
+;; A very simple defstruct built on lists. It supports just slot with
+;; an optional default initform, and it will create a constructor,
+;; predicate and accessors for you.
+(defmacro def!struct (name &rest slots)
+ (unless (symbolp name)
+ (error "It is not a full defstruct implementation."))
+ (let* ((name-string (symbol-name name))
+ (slot-descriptions
+ (mapcar (lambda (sd)
+ (cond
+ ((symbolp sd)
+ (list sd))
+ ((and (listp sd) (car sd) (cddr sd))
+ sd)
+ (t
+ (error "Bad slot description `~S'." sd))))
+ slots))
+ (predicate (intern (concat name-string "-P"))))
+ `(progn
+ ;; Constructor
+ (defun ,(intern (concat "MAKE-" name-string)) (&key ,@slot-descriptions)
+ (list ',name ,@(mapcar #'car slot-descriptions)))
+ ;; Predicate
+ (defun ,predicate (x)
+ (and (consp x) (eq (car x) ',name)))
+ ;; Copier
+ (defun ,(intern (concat "COPY-" name-string)) (x)
+ (copy-list x))
+ ;; Slot accessors
+ ,@(with-collect
+ (let ((index 1))
+ (dolist (slot slot-descriptions)
+ (let* ((name (car slot))
+ (accessor-name (intern (concat name-string "-" (string name)))))
+ (collect
+ `(defun ,accessor-name (x)
+ (unless (,predicate x)
+ (error "The object `~S' is not of type `~S'" x ,name-string))
+ (nth ,index x)))
+ ;; TODO: Implement this with a higher level
+ ;; abstraction like defsetf or (defun (setf ..))
+ (collect
+ `(define-setf-expander ,accessor-name (x)
+ (let ((object (gensym))
+ (new-value (gensym)))
+ (values (list object)
+ (list x)
+ (list new-value)
+ `(progn
+ (rplaca (nthcdr ,',index ,object) ,new-value)
+ ,new-value)
+ `(,',accessor-name ,object)))))
+ (incf index)))))
+ ',name)))