(in-package :lisp-on-lines)
-(defvar *description*)
-(defvar *display*)
-(defvar *object* nil)
+(defvar *display*)
-(deflayer display-layer)
(define-layered-function display-using-description (description display object &rest args)
(:documentation
"Displays OBJECT via description using/in/with/on display"))
-(defun display (display object &rest args &key attributes )
- (let ((*display-attributes* attributes))
- (apply #'display-using-description (description-of object) display object args)))
+
+
+(defun modify-layer-context (context &key activate deactivate)
+ (dolist (d deactivate)
+ (setf context (remove-layer (find-description d)
+ context)))
+ (dolist (d activate context)
+ (setf context (adjoin-layer (find-description d)
+ context))))
+
+
+
+
+(defun display (display object &rest args &key deactivate activate &allow-other-keys)
+ (funcall-with-layer-context
+ (modify-layer-context (current-layer-context)
+ :activate activate
+ :deactivate deactivate)
+ (lambda ()
+ (apply #'display-using-description (description-of object) display object args))))
(define-layered-method display-using-description
:around (description display object &rest args)
(declare (ignorable args))
- (let ((*description* description)
- (*display* display)
- (*object* object))
- (dletf (((described-object description) object))
- (contextl::funcall-with-special-initargs
- (loop
- :for (key val) :on args :by #'cddr
- :collect (list (find key (description-attributes description)
- :key #'attribute-keyword)
- :value val))
- (lambda ()
- (contextl::funcall-with-special-initargs
- (let ((attribute (find-attribute description 'active-attributes)))
- (when attribute
- (loop for spec in (attribute-value attribute)
- if (listp spec)
- collect (cons (or
- (find-attribute description (car spec))
- (error "No attribute matching ~A" (car spec)))
- (cdr spec)))))
+ (let ((*display* display))
+ (apply #'funcall-with-described-object
(lambda ()
- (call-next-method))))))))
-
+ (call-next-method))
+ object description args)))
+
+
+
(defun display/d (&rest args)
(return
(destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym)))
(car tail)
- `(define-layered-method
+ `(define-layered-method
display-using-description
:in-layer ,(if (eq t description)
t