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1 | (in-package :lisp-on-lines) |
2 | |
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3 | |
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4 | (defvar *display*) |
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5 | |
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6 | |
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7 | (define-layered-function display-using-description (description display object &rest args) |
8 | (:documentation |
9 | "Displays OBJECT via description using/in/with/on display")) |
10 | |
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11 | |
12 | |
13 | (defun modify-layer-context (context &key activate deactivate) |
14 | (dolist (d deactivate) |
15 | (setf context (remove-layer (find-description d) |
16 | context))) |
17 | (dolist (d activate context) |
18 | (setf context (adjoin-layer (find-description d) |
19 | context)))) |
20 | |
21 | |
22 | |
23 | |
24 | (defun display (display object &rest args &key deactivate activate &allow-other-keys) |
25 | (funcall-with-layer-context |
26 | (modify-layer-context (current-layer-context) |
27 | :activate activate |
28 | :deactivate deactivate) |
29 | (lambda () |
30 | (apply #'display-using-description (description-of object) display object args)))) |
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31 | |
32 | (define-layered-method display-using-description |
33 | :around (description display object &rest args) |
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34 | (declare (ignorable args)) |
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35 | (let ((*display* display)) |
36 | (apply #'funcall-with-described-object |
37 | (lambda () |
38 | (call-next-method)) |
39 | object description args))) |
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40 | |
41 | |
42 | |
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43 | |
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44 | |
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45 | (defun display/d (&rest args) |
46 | (apply #'display-using-description args)) |
47 | |
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48 | (define-layered-method display-using-description (description display object &rest args) |
49 | (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S |
50 | |
51 | OMGWTF! If you didn't do this, it's a bug!" description display object args)) |
52 | |
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53 | (defmacro define-display (&body body) |
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54 | (loop with in-descriptionp = (eq (car body) :in-description) |
55 | with description = (if in-descriptionp (cadr body) 't) |
56 | for tail on (if in-descriptionp (cddr body) body) |
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57 | until (listp (car tail)) |
58 | collect (car tail) into qualifiers |
59 | finally |
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60 | (when (member :in-description qualifiers) |
61 | (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers.")) |
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62 | (return |
63 | (destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym))) |
64 | (car tail) |
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65 | `(define-layered-method |
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66 | display-using-description |
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67 | :in-layer ,(if (eq t description) |
68 | t |
69 | (defining-description description)) |
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70 | ,@qualifiers |
71 | (,(if (listp description-spec) |
72 | (list (first description-spec) |
73 | (if (eq 'description (second description-spec)) |
74 | 'description |
75 | (defining-description (second description-spec))))) |
76 | ,display-spec |
77 | ,object-spec &rest args) |
78 | (declare (ignorable args)) |
79 | ,@(cdr tail)))))) |
80 | |
81 | |
82 | |
83 | |