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fdeed55d DC |
1 | (in-package :lisp-on-lines) |
2 | ||
2b0fd9c8 DC |
3 | (define-layered-function display-using-description (description object component) |
4 | (:documentation | |
5 | "Render the object in component, | |
6 | using DESCRIPTION, which is an occurence, an attribute, or something else entirely.")) | |
fdeed55d | 7 | |
2b0fd9c8 DC |
8 | (define-layered-method |
9 | display-using-description (d o c) | |
10 | (<:as-html "default :" o)) | |
11 | ||
12 | (defmethod find-layer-for-type (type) | |
13 | type) | |
14 | ||
15 | ||
16 | (define-layered-function display (component object &rest args) | |
17 | (:documentation | |
18 | "Displays OBJECT in COMPONENT.")) | |
19 | ||
20 | (define-layered-method display ((component t) (object t) | |
21 | &rest properties | |
22 | &key type | |
23 | &allow-other-keys) | |
24 | "The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method." | |
25 | ||
26 | (let* ((occurence (find-occurence object)) | |
27 | (description (or (find-display-attribute | |
28 | occurence | |
29 | (setf type (or type (description.type occurence)))) | |
30 | occurence))) | |
31 | (if description | |
32 | (dletf (((description.type occurence) type) | |
33 | ((description.layers description) (append `(+ | |
34 | ||
35 | ;;find-layer-for-type is a | |
36 | ;; backwards compat thing | |
37 | ,(find-layer-for-type | |
38 | type)) | |
39 | (description.layers description))) | |
40 | ((attributes description) (or | |
41 | (attributes description) | |
42 | (list-slots object)))) | |
43 | (funcall-with-description | |
44 | description properties | |
45 | #'display-using-description description object component)) | |
46 | (error "no description for ~A" object)))) | |
fdeed55d DC |
47 | |
48 | ;;;;; Macros | |
2b0fd9c8 DC |
49 | ;;;; TODO: " should really be a funcall-with function with a small wrapper." |
50 | ||
51 | (defun funcall-with-description (description properties function &rest args) | |
52 | (if description | |
53 | (dletf* (((description.type description) (or | |
54 | (getf properties :type) | |
55 | (description.type description))) | |
56 | ||
57 | ((description.layers description) (append | |
58 | (description.layers description) | |
59 | (getf properties :layers))) | |
60 | ((description.properties description) properties)) | |
61 | (funcall-with-layers | |
62 | (description.layers description) | |
63 | #'(lambda () | |
64 | (funcall-with-special-initargs | |
65 | description properties | |
66 | #'(lambda () | |
67 | (apply function args)))))) | |
68 | (apply function args))) | |
69 | ||
70 | ||
71 | ||
72 | (defmacro with-description ((description &rest properties) &body body) | |
73 | `(funcall-with-description ,description (if ',(cdr properties) | |
74 | (list ,@properties) | |
75 | ,(car properties)) | |
76 | #'(lambda () | |
77 | ,@body))) | |
78 | ||
79 | (defmacro do-attributes ((var description &optional (attributes `(attributes ,description))) &body body) | |
fdeed55d | 80 | (with-unique-names (att properties type) |
2b0fd9c8 DC |
81 | `(dolist* (,att ,attributes) |
82 | (let* ((,att (ensure-list ,att)) | |
fdeed55d DC |
83 | (,properties (rest ,att)) |
84 | (,type (getf ,properties :type)) | |
2b0fd9c8 DC |
85 | (,var (let ((a (find-attribute ,description (first ,att)))) |
86 | (if ,type | |
87 | (apply #'make-attribute :name (first ,att) :type ,type ,properties) | |
88 | (if a a (make-attribute :name (first ,att) :slot-name (first ,att))))))) | |
89 | (funcall-with-description ,var ,properties | |
90 | #'(lambda () ,@body)))))) | |
91 | ||
92 | (defmacro with-component ((component) &body body) | |
93 | `(let ((self ,component)) | |
94 | (declare (ignorable self)) | |
95 | (flet ((display* (thing &rest args) | |
96 | (apply #'display ,component thing args)) | |
97 | (display-attribute (attribute obj &optional props) | |
98 | (if props | |
99 | (funcall-with-description | |
100 | attribute props | |
101 | #'display-using-description attribute obj ,component) | |
102 | (display-using-description attribute obj ,component)))) | |
103 | (declare (ignorable #'display* #'display-attribute)) | |
104 | ,@body))) | |
105 | ||
106 | (defmacro defdisplay (&body body) | |
107 | (loop with in-layerp = (eq (car body) :in-layer) | |
108 | with layer = (if in-layerp (cadr body) 't) | |
109 | for tail on (if in-layerp (cddr body) body) | |
110 | until (listp (car tail)) | |
111 | collect (car tail) into qualifiers | |
112 | finally | |
113 | (when (member :in-layer qualifiers) | |
114 | (error "Incorrect occurrence of :in-layer in defdisplay. Must occur before qualifiers.")) | |
115 | (return | |
116 | (destructuring-bind (description object &optional component) (car tail) | |
117 | (with-unique-names (d c) | |
118 | (let (standard-description-p) | |
119 | `(define-layered-method | |
120 | display-using-description | |
121 | :in-layer ,layer | |
122 | ,@qualifiers | |
123 | ||
124 | (,(cond | |
125 | ((listp description) | |
126 | (setf d (car description)) | |
127 | description) | |
128 | (t | |
129 | (setf d description) | |
130 | (setf standard-description-p t) | |
131 | `(,d description))) | |
132 | ,object | |
133 | ,(cond | |
134 | ((null component) | |
135 | `(,c component)) | |
136 | ((listp component) | |
137 | (setf c (car component)) | |
138 | component) | |
139 | (t | |
140 | (setf c component) | |
141 | `(,c component)))) | |
142 | (with-component (,c) | |
143 | ,@(cdr tail))))))))) | |
144 | ||
145 |