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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 | |
8 | (deflayer display-layer) |
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9 | |
10 | (define-layered-function display-using-description (description display object &rest args) |
11 | (:documentation |
12 | "Displays OBJECT via description using/in/with/on display")) |
13 | |
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14 | (defun display (display object &rest args &key attributes ) |
15 | (let ((*display-attributes* attributes)) |
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16 | (apply #'display-using-description (description-of object) display object args))) |
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17 | |
18 | (define-layered-method display-using-description |
19 | :around (description display object &rest args) |
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20 | (declare (ignorable args)) |
21 | (let ((*description* description) |
22 | (*display* display) |
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23 | (*object* object)) |
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24 | (dletf (((described-object description) object)) |
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25 | (contextl::funcall-with-special-initargs |
26 | (loop |
27 | :for (key val) :on args :by #'cddr |
28 | :collect (list (find key (description-attributes description) |
29 | :key #'attribute-keyword) |
30 | :value val)) |
31 | (lambda () |
32 | (contextl::funcall-with-special-initargs |
33 | (let ((attribute (find-attribute description 'active-attributes))) |
34 | (when attribute |
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35 | (loop for spec in (attribute-value attribute) |
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36 | if (listp spec) |
37 | collect (cons (or |
38 | (find-attribute description (car spec)) |
39 | (error "No attribute matching ~A" (car spec))) |
40 | (cdr spec))))) |
41 | (lambda () |
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42 | (call-next-method)))))))) |
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43 | |
44 | |
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45 | |
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46 | (defun display/d (&rest args) |
47 | (apply #'display-using-description args)) |
48 | |
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49 | (define-layered-method display-using-description (description display object &rest args) |
50 | (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S |
51 | |
52 | OMGWTF! If you didn't do this, it's a bug!" description display object args)) |
53 | |
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54 | (defmacro define-display (&body body) |
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55 | (loop with in-descriptionp = (eq (car body) :in-description) |
56 | with description = (if in-descriptionp (cadr body) 't) |
57 | for tail on (if in-descriptionp (cddr body) body) |
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58 | until (listp (car tail)) |
59 | collect (car tail) into qualifiers |
60 | finally |
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61 | (when (member :in-description qualifiers) |
62 | (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers.")) |
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63 | (return |
64 | (destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym))) |
65 | (car tail) |
66 | `(define-layered-method |
67 | display-using-description |
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68 | :in-layer ,(if (eq t description) |
69 | t |
70 | (defining-description description)) |
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71 | ,@qualifiers |
72 | (,(if (listp description-spec) |
73 | (list (first description-spec) |
74 | (if (eq 'description (second description-spec)) |
75 | 'description |
76 | (defining-description (second description-spec))))) |
77 | ,display-spec |
78 | ,object-spec &rest args) |
79 | (declare (ignorable args)) |
80 | ,@(cdr tail)))))) |
81 | |
82 | |
83 | |
84 | |