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1 | (in-package :lisp-on-lines) |
2 | |
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3 | (defvar *description*) |
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4 | (defvar *display*) |
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5 | (defvar *object* nil) |
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)) |
35 | (let ((*description* description) |
36 | (*display* display) |
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37 | (*object* object)) |
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38 | ; (<:as-html " " description "Layer Active?: " (layer-active-p (defining-description 'maxclaims::link-to-viewer))) |
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39 | (dletf (((described-object description) object)) |
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40 | (flet ((do-display () |
41 | (contextl::funcall-with-special-initargs |
42 | (loop |
43 | :for (key val) :on args :by #'cddr |
44 | :collect (list (find key (description-attributes description) |
45 | :key #'attribute-keyword) |
46 | :value val)) |
47 | (lambda () |
48 | (contextl::funcall-with-special-initargs |
49 | (let ((attribute (ignore-errors (find-attribute description 'active-attributes)))) |
50 | (when attribute |
51 | (loop for spec in (attribute-value attribute) |
52 | if (listp spec) |
53 | collect (cons (or |
54 | (find-attribute description (car spec)) |
55 | (error "No attribute matching ~A" (car spec))) |
56 | (cdr spec))))) |
57 | (lambda () (call-next-method))))))) |
58 | (funcall-with-layer-context |
59 | (modify-layer-context |
60 | (if (standard-description-p description) |
61 | (adjoin-layer description (current-layer-context)) |
62 | (current-layer-context)) |
63 | :activate (description-active-descriptions description) |
64 | :deactivate (description-inactive-descriptions description)) |
65 | (function do-display)))))) |
66 | |
67 | |
68 | |
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69 | |
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70 | |
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71 | (defun display/d (&rest args) |
72 | (apply #'display-using-description args)) |
73 | |
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74 | (define-layered-method display-using-description (description display object &rest args) |
75 | (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S |
76 | |
77 | OMGWTF! If you didn't do this, it's a bug!" description display object args)) |
78 | |
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79 | (defmacro define-display (&body body) |
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80 | (loop with in-descriptionp = (eq (car body) :in-description) |
81 | with description = (if in-descriptionp (cadr body) 't) |
82 | for tail on (if in-descriptionp (cddr body) body) |
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83 | until (listp (car tail)) |
84 | collect (car tail) into qualifiers |
85 | finally |
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86 | (when (member :in-description qualifiers) |
87 | (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers.")) |
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88 | (return |
89 | (destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym))) |
90 | (car tail) |
91 | `(define-layered-method |
92 | display-using-description |
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93 | :in-layer ,(if (eq t description) |
94 | t |
95 | (defining-description description)) |
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96 | ,@qualifiers |
97 | (,(if (listp description-spec) |
98 | (list (first description-spec) |
99 | (if (eq 'description (second description-spec)) |
100 | 'description |
101 | (defining-description (second description-spec))))) |
102 | ,display-spec |
103 | ,object-spec &rest args) |
104 | (declare (ignorable args)) |
105 | ,@(cdr tail)))))) |
106 | |
107 | |
108 | |
109 | |