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