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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 ) |
f9b11956 | 5 | (:method-combination wrapping-standard) |
2b0fd9c8 DC |
6 | (:documentation |
7 | "Render the object in component, | |
8 | using DESCRIPTION, which is an occurence, an attribute, or something else entirely.")) | |
fdeed55d | 9 | |
2b0fd9c8 DC |
10 | (define-layered-method |
11 | display-using-description (d o c) | |
12 | (<:as-html "default :" o)) | |
13 | ||
14 | (defmethod find-layer-for-type (type) | |
15 | type) | |
16 | ||
17 | ||
18 | (define-layered-function display (component object &rest args) | |
19 | (:documentation | |
20 | "Displays OBJECT in COMPONENT.")) | |
21 | ||
22 | (define-layered-method display ((component t) (object t) | |
23 | &rest properties | |
0386c736 | 24 | &key type (line #'line-in) |
2b0fd9c8 | 25 | &allow-other-keys) |
0386c736 | 26 | " The default display dispatch method |
27 | ||
28 | DISPLAY takes two required arguments, | |
29 | COMPONENT : The component to display FROM (not neccesarily 'in') | |
30 | OBJECT : The 'thing' we want to display... in this case it's the component | |
31 | ||
32 | DISPLAY also takes keywords arguments which modify the DESCRIPTION, | |
33 | that is to say the parameters that come together to create the output. | |
34 | ||
35 | The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method." | |
36 | ||
f9b11956 | 37 | (let* ((description (find-occurence object))) |
38 | ||
0386c736 | 39 | (if description |
f9b11956 | 40 | (dletf (((description.type description) type) |
0386c736 | 41 | ((attributes description) (or |
42 | (attributes description) | |
43 | (list-slots object)))) | |
44 | ;; apply the default line to the description | |
45 | (funcall-with-description | |
46 | description | |
47 | (funcall line object) | |
48 | ;; apply the passed in arguments and call display-using-description | |
49 | #'(lambda () | |
50 | (funcall-with-description | |
51 | description | |
52 | properties | |
53 | #'display-using-description description object component)))) | |
54 | (error "no description for ~A" object)))) | |
fdeed55d DC |
55 | |
56 | ;;;;; Macros | |
a4e6154d | 57 | |
2b0fd9c8 DC |
58 | |
59 | (defun funcall-with-description (description properties function &rest args) | |
0386c736 | 60 | |
2b0fd9c8 DC |
61 | (if description |
62 | (dletf* (((description.type description) (or | |
63 | (getf properties :type) | |
64 | (description.type description))) | |
65 | ||
66 | ((description.layers description) (append | |
67 | (description.layers description) | |
68 | (getf properties :layers))) | |
0386c736 | 69 | ((description.properties description) (append (description.properties description) properties))) |
2b0fd9c8 DC |
70 | (funcall-with-layers |
71 | (description.layers description) | |
72 | #'(lambda () | |
a4e6154d DC |
73 | (contextl::funcall-with-special-initargs |
74 | (list (cons description properties)) | |
2b0fd9c8 DC |
75 | #'(lambda () |
76 | (apply function args)))))) | |
77 | (apply function args))) | |
78 | ||
79 | ||
80 | ||
81 | (defmacro with-description ((description &rest properties) &body body) | |
82 | `(funcall-with-description ,description (if ',(cdr properties) | |
83 | (list ,@properties) | |
84 | ,(car properties)) | |
85 | #'(lambda () | |
86 | ,@body))) | |
87 | ||
f9b11956 | 88 | (define-layered-function find-do-attributes (desc)) |
89 | ||
90 | (define-layered-method find-do-attributes ((description description)) | |
91 | ||
92 | (loop | |
93 | :for att | |
94 | :in (attributes description) | |
95 | :collect (let ((default (find (car (ensure-list att)) | |
96 | (default-attributes description) | |
97 | :key #'car))) | |
98 | (or default att)))) | |
99 | ||
100 | (defmacro do-attributes ((var description &optional (attributes `(find-do-attributes ,description))) &body body) | |
fdeed55d | 101 | (with-unique-names (att properties type) |
2b0fd9c8 | 102 | `(dolist* (,att ,attributes) |
f9b11956 | 103 | (let* ((,att (ensure-list ,att)) |
104 | (,properties (rest ,att)) | |
105 | (,type (getf ,properties :type)) | |
106 | (,var (let ((a (find-attribute ,description (first ,att)))) | |
107 | (if ,type | |
108 | (apply #'make-attribute :name (first ,att) :type ,type ,properties) | |
109 | (if a a (make-attribute :name (first ,att) :slot-name (first ,att))))))) | |
110 | (funcall-with-description ,var ,properties | |
111 | #'(lambda () | |
112 | ,@body)))))) | |
2b0fd9c8 DC |
113 | |
114 | (defmacro with-component ((component) &body body) | |
115 | `(let ((self ,component)) | |
116 | (declare (ignorable self)) | |
117 | (flet ((display* (thing &rest args) | |
118 | (apply #'display ,component thing args)) | |
119 | (display-attribute (attribute obj &optional props) | |
120 | (if props | |
121 | (funcall-with-description | |
122 | attribute props | |
123 | #'display-using-description attribute obj ,component) | |
124 | (display-using-description attribute obj ,component)))) | |
125 | (declare (ignorable #'display* #'display-attribute)) | |
126 | ,@body))) | |
127 | ||
128 | (defmacro defdisplay (&body body) | |
129 | (loop with in-layerp = (eq (car body) :in-layer) | |
130 | with layer = (if in-layerp (cadr body) 't) | |
131 | for tail on (if in-layerp (cddr body) body) | |
132 | until (listp (car tail)) | |
133 | collect (car tail) into qualifiers | |
134 | finally | |
135 | (when (member :in-layer qualifiers) | |
136 | (error "Incorrect occurrence of :in-layer in defdisplay. Must occur before qualifiers.")) | |
137 | (return | |
0386c736 | 138 | (destructuring-bind (description &optional object component) (car tail) |
2b0fd9c8 DC |
139 | (with-unique-names (d c) |
140 | (let (standard-description-p) | |
141 | `(define-layered-method | |
142 | display-using-description | |
143 | :in-layer ,layer | |
144 | ,@qualifiers | |
0386c736 | 145 | |
146 | ,@(unless object | |
147 | (setf object description) | |
148 | (setf description d) | |
149 | nil) | |
2b0fd9c8 DC |
150 | (,(cond |
151 | ((listp description) | |
152 | (setf d (car description)) | |
153 | description) | |
154 | (t | |
155 | (setf d description) | |
156 | (setf standard-description-p t) | |
157 | `(,d description))) | |
158 | ,object | |
159 | ,(cond | |
160 | ((null component) | |
161 | `(,c component)) | |
162 | ((listp component) | |
163 | (setf c (car component)) | |
164 | component) | |
165 | (t | |
166 | (setf c component) | |
167 | `(,c component)))) | |
168 | (with-component (,c) | |
169 | ,@(cdr tail))))))))) | |
170 | ||
171 |