+(defbinding %object-class-properties () pointer
+ (class pointer)
+ (n-properties unsigned-int :out))
+
+(defun query-object-class-properties (type)
+ (let ((class (type-class-ref type)))
+ (multiple-value-bind (array length)
+ (%object-class-properties class)
+ (map-c-array 'list #'identity array 'param length))))
+
+(defun query-object-class-dependencies (class)
+ (delete-duplicates
+ (reduce
+ #'nconc
+ (mapcar
+ #'(lambda (param)
+ ;; A gobject does not depend on it's supertypes due to forward
+ ;; referenced superclasses
+ (delete-if
+ #'(lambda (type)
+ (type-is-p class type))
+ (type-hierarchy (param-type param))))
+ (query-object-class-properties class)))))
+
+
+(defun default-slot-name (name)
+ (intern (substitute #\- #\_ (string-upcase (string-upcase name)))))
+
+(defun default-slot-accessor (class-name slot-name type)
+ (intern
+ (format
+ nil "~A-~A~A" class-name slot-name
+ (if (eq 'boolean type) "-p" ""))))
+
+(defun expand-gobject-type (type-number &optional slots)
+ (let* ((super (supertype type-number))
+ (class (type-from-number type-number))
+ (expanded-slots
+ (mapcar
+ #'(lambda (param)
+ (with-slots (name flags type documentation) param
+ (let* ((slot-name (default-slot-name name))
+ (slot-type (type-from-number type))
+ (accessor
+ (default-slot-accessor class slot-name slot-type)))
+ `(,slot-name
+ :allocation :param
+ :param ,name
+ ,@(when (member :writable flags)
+ (list :writer `(setf ,accessor)))
+ ,@(when (member :readable flags)
+ (list :reader accessor))
+ ,@(when (member :construct flags)
+ (list :initarg (intern (string slot-name) "KEYWORD")))
+ :type ,slot-type
+ ,@(when documentation
+ (list :documentation documentation))))))
+ (query-object-class-properties type-number))))
+
+ `(defclass ,class (,super)
+ ,expanded-slots
+ (:metaclass gobject-class)
+ (:alien-name ,(find-type-name type-number)))))
+
+(register-derivable-type
+ 'gobject "GObject"
+ :query 'query-object-class-dependencies
+ :expand 'expand-gobject-type)
+