1 (in-package :lisp-on-lines
)
7 (define-layered-function display-using-description
(description display object
&rest args
)
9 "Displays OBJECT via description using/in/with/on display"))
13 (defun modify-layer-context (context &key activate deactivate
)
14 (dolist (d deactivate
)
15 (setf context
(remove-layer (find-description d
)
17 (dolist (d activate context
)
18 (setf context
(adjoin-layer (find-description d
)
21 (defun funcall-with-attribute-context (attribute thunk
)
22 (funcall-with-layer-context
23 (modify-layer-context (current-layer-context)
24 :activate
(attribute-active-descriptions attribute
)
25 :deactivate
(attribute-inactive-descriptions attribute
))
28 (defmacro with-attribute-context
((attribute) &body body
)
29 `(funcall-with-attribute-context ,attribute
(lambda () ,@body
)))
32 (defun display (display object
&rest args
&key deactivate activate
&allow-other-keys
)
34 (funcall-with-layer-context
35 (modify-layer-context (current-layer-context)
37 :deactivate deactivate
)
39 (apply #'display-using-description
(description-of object
) display object args
))))
41 (define-layered-method display-using-description
42 :around
((description standard-description-object
) display object
&rest args
)
43 (declare (ignorable args
))
44 #+nil
(break "Entering DISPLAY for ~A on ~A using ~A" object display description
)
45 (let ((*display
* display
))
46 (apply #'funcall-with-described-object
49 object description args
)))
54 (defun display/d
(&rest args
)
55 (apply #'display-using-description args
))
57 (define-layered-method display-using-description
(description display object
&rest args
)
58 (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S
60 OMGWTF! If you didn't do this, it's a bug!" description display object args
))
62 (defmacro define-display
(&body body
)
63 (loop with in-descriptionp
= (eq (car body
) :in-description
)
64 with description
= (if in-descriptionp
(cadr body
) 't
)
65 for tail on
(if in-descriptionp
(cddr body
) body
)
66 until
(listp (car tail
))
67 collect
(car tail
) into qualifiers
69 (when (member :in-description qualifiers
)
70 (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers."))
72 (destructuring-bind (description-spec &optional
(display-spec (gensym)) (object-spec (gensym)))
74 `(define-layered-method
75 display-using-description
76 :in-layer
,(if (eq t description
)
78 (defining-description description
))
80 (,(if (listp description-spec
)
81 (list (first description-spec
)
82 (if (eq 'description
(second description-spec
))
84 (contextl::defining-layer
(defining-description (second description-spec
))))))
86 ,object-spec
&rest args
)
87 (declare (ignorable args
))