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fdeed55d DC |
1 | (in-package :lisp-on-lines) |
2 | ||
2b0fd9c8 | 3 | (define-layered-function display-using-description (description object component) |
a4e6154d | 4 | ; (:argument-precedence-order ) |
2b0fd9c8 DC |
5 | (:documentation |
6 | "Render the object in component, | |
7 | using DESCRIPTION, which is an occurence, an attribute, or something else entirely.")) | |
fdeed55d | 8 | |
2b0fd9c8 DC |
9 | (define-layered-method |
10 | display-using-description (d o c) | |
11 | (<:as-html "default :" o)) | |
12 | ||
13 | (defmethod find-layer-for-type (type) | |
14 | type) | |
15 | ||
16 | ||
17 | (define-layered-function display (component object &rest args) | |
18 | (:documentation | |
19 | "Displays OBJECT in COMPONENT.")) | |
20 | ||
21 | (define-layered-method display ((component t) (object t) | |
22 | &rest properties | |
23 | &key type | |
24 | &allow-other-keys) | |
25 | "The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method." | |
26 | ||
27 | (let* ((occurence (find-occurence object)) | |
28 | (description (or (find-display-attribute | |
29 | occurence | |
30 | (setf type (or type (description.type occurence)))) | |
31 | occurence))) | |
32 | (if description | |
33 | (dletf (((description.type occurence) type) | |
34 | ((description.layers description) (append `(+ | |
35 | ||
36 | ;;find-layer-for-type is a | |
37 | ;; backwards compat thing | |
38 | ,(find-layer-for-type | |
39 | type)) | |
40 | (description.layers description))) | |
41 | ((attributes description) (or | |
42 | (attributes description) | |
43 | (list-slots object)))) | |
44 | (funcall-with-description | |
45 | description properties | |
46 | #'display-using-description description object component)) | |
47 | (error "no description for ~A" object)))) | |
fdeed55d DC |
48 | |
49 | ;;;;; Macros | |
a4e6154d | 50 | |
2b0fd9c8 DC |
51 | |
52 | (defun funcall-with-description (description properties function &rest args) | |
53 | (if description | |
54 | (dletf* (((description.type description) (or | |
55 | (getf properties :type) | |
56 | (description.type description))) | |
57 | ||
58 | ((description.layers description) (append | |
59 | (description.layers description) | |
60 | (getf properties :layers))) | |
61 | ((description.properties description) properties)) | |
62 | (funcall-with-layers | |
63 | (description.layers description) | |
64 | #'(lambda () | |
a4e6154d DC |
65 | (contextl::funcall-with-special-initargs |
66 | (list (cons description properties)) | |
2b0fd9c8 DC |
67 | #'(lambda () |
68 | (apply function args)))))) | |
69 | (apply function args))) | |
70 | ||
71 | ||
72 | ||
73 | (defmacro with-description ((description &rest properties) &body body) | |
74 | `(funcall-with-description ,description (if ',(cdr properties) | |
75 | (list ,@properties) | |
76 | ,(car properties)) | |
77 | #'(lambda () | |
78 | ,@body))) | |
79 | ||
80 | (defmacro do-attributes ((var description &optional (attributes `(attributes ,description))) &body body) | |
fdeed55d | 81 | (with-unique-names (att properties type) |
2b0fd9c8 DC |
82 | `(dolist* (,att ,attributes) |
83 | (let* ((,att (ensure-list ,att)) | |
fdeed55d DC |
84 | (,properties (rest ,att)) |
85 | (,type (getf ,properties :type)) | |
2b0fd9c8 DC |
86 | (,var (let ((a (find-attribute ,description (first ,att)))) |
87 | (if ,type | |
88 | (apply #'make-attribute :name (first ,att) :type ,type ,properties) | |
89 | (if a a (make-attribute :name (first ,att) :slot-name (first ,att))))))) | |
90 | (funcall-with-description ,var ,properties | |
91 | #'(lambda () ,@body)))))) | |
92 | ||
93 | (defmacro with-component ((component) &body body) | |
94 | `(let ((self ,component)) | |
95 | (declare (ignorable self)) | |
96 | (flet ((display* (thing &rest args) | |
97 | (apply #'display ,component thing args)) | |
98 | (display-attribute (attribute obj &optional props) | |
99 | (if props | |
100 | (funcall-with-description | |
101 | attribute props | |
102 | #'display-using-description attribute obj ,component) | |
103 | (display-using-description attribute obj ,component)))) | |
104 | (declare (ignorable #'display* #'display-attribute)) | |
105 | ,@body))) | |
106 | ||
107 | (defmacro defdisplay (&body body) | |
108 | (loop with in-layerp = (eq (car body) :in-layer) | |
109 | with layer = (if in-layerp (cadr body) 't) | |
110 | for tail on (if in-layerp (cddr body) body) | |
111 | until (listp (car tail)) | |
112 | collect (car tail) into qualifiers | |
113 | finally | |
114 | (when (member :in-layer qualifiers) | |
115 | (error "Incorrect occurrence of :in-layer in defdisplay. Must occur before qualifiers.")) | |
116 | (return | |
117 | (destructuring-bind (description object &optional component) (car tail) | |
118 | (with-unique-names (d c) | |
119 | (let (standard-description-p) | |
120 | `(define-layered-method | |
121 | display-using-description | |
122 | :in-layer ,layer | |
123 | ,@qualifiers | |
124 | ||
125 | (,(cond | |
126 | ((listp description) | |
127 | (setf d (car description)) | |
128 | description) | |
129 | (t | |
130 | (setf d description) | |
131 | (setf standard-description-p t) | |
132 | `(,d description))) | |
133 | ,object | |
134 | ,(cond | |
135 | ((null component) | |
136 | `(,c component)) | |
137 | ((listp component) | |
138 | (setf c (car component)) | |
139 | component) | |
140 | (t | |
141 | (setf c component) | |
142 | `(,c component)))) | |
143 | (with-component (,c) | |
144 | ,@(cdr tail))))))))) | |
145 | ||
146 |