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 (if (consp d
) (car d
) 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
))
27 (with-special-symbol-access
28 (contextl::funcall-with-special-initargs
29 (mappend (lambda (desc)
31 (let ((description (find-description (car desc
))))
33 :for
(key val
) :on
(cdr desc
) :by
#'cddr
34 :collect
(list (find key
(description-attributes description
)
35 :key
#'attribute-keyword
)
37 (attribute-active-descriptions attribute
))
39 (without-special-symbol-access
40 (funcall thunk
))))))))
42 (defmacro with-attribute-context
((attribute) &body body
)
43 `(funcall-with-attribute-context ,attribute
(lambda () ,@body
)))
46 (defun display (display object
&rest args
&key deactivate activate
&allow-other-keys
)
47 (funcall-with-layer-context
48 (modify-layer-context (current-layer-context)
50 :deactivate deactivate
)
52 (apply #'display-using-description
(description-of object
) display object args
))))
54 (define-layered-method display-using-description
55 :around
((description standard-description-object
) display object
&rest args
)
56 (declare (ignorable args
))
57 #+nil
(break "Entering DISPLAY for ~A on ~A using ~A" object display description
)
58 (let ((*display
* display
))
59 (apply #'funcall-with-described-object
62 object description args
)))
67 (defun display/d
(&rest args
)
68 (apply #'display-using-description args
))
70 (define-layered-method display-using-description
(description display object
&rest args
)
71 (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S
73 OMGWTF! If you didn't do this, it's a bug!" description display object args
))
75 (defmacro define-display
(&body body
)
76 (loop with in-descriptionp
= (eq (car body
) :in-description
)
77 with description
= (if in-descriptionp
(cadr body
) 't
)
78 for tail on
(if in-descriptionp
(cddr body
) body
)
79 until
(listp (car tail
))
80 collect
(car tail
) into qualifiers
82 (when (member :in-description qualifiers
)
83 (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers."))
85 (destructuring-bind (description-spec &optional
(display-spec (gensym)) (object-spec (gensym)))
87 `(define-layered-method
88 display-using-description
89 :in-layer
,(if (eq t description
)
91 (defining-description description
))
93 (,(if (listp description-spec
)
94 (list (first description-spec
)
95 (if (eq 'description
(second description-spec
))
97 (contextl::defining-layer
(defining-description (second description-spec
))))))
99 ,object-spec
&rest args
)
100 (declare (ignorable args
))