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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)))) |
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20 | |
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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)) |
26 | thunk)) |
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27 | |
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28 | (defmacro with-attribute-context ((attribute) &body body) |
29 | `(funcall-with-attribute-context ,attribute (lambda () ,@body))) |
30 | |
31 | |
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32 | (defun display (display object &rest args &key deactivate activate &allow-other-keys) |
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33 | |
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34 | (funcall-with-layer-context |
35 | (modify-layer-context (current-layer-context) |
36 | :activate activate |
37 | :deactivate deactivate) |
38 | (lambda () |
39 | (apply #'display-using-description (description-of object) display object args)))) |
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40 | |
41 | (define-layered-method display-using-description |
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42 | :around ((description standard-description-object) display object &rest args) |
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43 | (declare (ignorable args)) |
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44 | #+nil (break "Entering DISPLAY for ~A on ~A using ~A" object display description) |
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45 | (let ((*display* display)) |
46 | (apply #'funcall-with-described-object |
47 | (lambda () |
48 | (call-next-method)) |
49 | object description args))) |
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50 | |
51 | |
52 | |
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53 | |
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54 | (defun display/d (&rest args) |
55 | (apply #'display-using-description args)) |
56 | |
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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 |
59 | |
60 | OMGWTF! If you didn't do this, it's a bug!" description display object args)) |
61 | |
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62 | (defmacro define-display (&body body) |
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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) |
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66 | until (listp (car tail)) |
67 | collect (car tail) into qualifiers |
68 | finally |
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69 | (when (member :in-description qualifiers) |
70 | (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers.")) |
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71 | (return |
72 | (destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym))) |
73 | (car tail) |
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74 | `(define-layered-method |
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75 | display-using-description |
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76 | :in-layer ,(if (eq t description) |
77 | t |
78 | (defining-description description)) |
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79 | ,@qualifiers |
80 | (,(if (listp description-spec) |
81 | (list (first description-spec) |
82 | (if (eq 'description (second description-spec)) |
83 | 'description |
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84 | (contextl::defining-layer (defining-description (second description-spec)))))) |
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85 | ,display-spec |
86 | ,object-spec &rest args) |
87 | (declare (ignorable args)) |
88 | ,@(cdr tail)))))) |
89 | |
90 | |
91 | |
92 | |