Moved description details out of display.
[clinton/lisp-on-lines.git] / src / attribute.lisp
1 (in-package :lisp-on-lines)
2
3 (define-layered-class direct-attribute-definition-class
4 (special-layered-direct-slot-definition
5 contextl::singleton-direct-slot-definition)
6 ((attribute-properties
7 :accessor direct-attribute-properties
8 :documentation "This is an plist to hold the values of
9 the attribute's properties as described by this direct
10 attribute definition.")))
11
12 (defmethod initialize-instance
13 :after ((attribute direct-attribute-definition-class)
14 &rest initargs)
15 (setf (direct-attribute-properties attribute) initargs))
16
17 (define-layered-class effective-attribute-definition-class
18 (special-layered-effective-slot-definition)
19 ((direct-attributes
20 :accessor attribute-direct-attributes)
21 (attribute-object
22 :accessor slot-definition-attribute-object)
23 (attribute-object-initargs
24 :accessor attribute-object-initargs)))
25
26 (defvar *function-access* nil
27 "set/get a place's property function instead of its symbol value
28 when this is set to a non-nil value")
29
30 (defmacro with-function-access (&body body)
31 "executes body in an environment with *function-access* set to t"
32 `(let ((*function-access* t))
33 ,@body))
34
35 (defmacro without-function-access (&body body)
36 "executes body in an environment with *function-access* set to nil"
37 `(let ((*function-access* nil))
38 ,@body))
39
40 (define-layered-function property-access-function (description attribute-name property-name)
41 (:method (description attribute-name property-name)
42 (ensure-layered-function
43 (defining-description
44 (intern (format nil "=PROPERTY-ACCESS-FUNCTION-FOR-~A->~A.~A="
45 (description-print-name description)
46 attribute-name
47 property-name)))
48 :lambda-list '(description))))
49
50
51 (defvar *init-time-description* nil)
52
53 (defmethod attribute-description :around (attribute)
54 (handler-case (call-next-method)
55 (unbound-slot ()
56 (or
57 *init-time-description*
58 (call-next-method)))))
59
60 (define-layered-class attribute ()
61 ((description :initarg :description
62 :accessor attribute-description)
63 (name
64 :layered-accessor attribute-name
65 :initarg :name)
66 (effective-attribute-definition
67 :initarg effective-attribute
68 :accessor attribute-effective-attribute-definition)
69 (attribute-class
70 :accessor attribute-class
71 :initarg :attribute-class
72 :initform 'standard-attribute)
73 (keyword
74 :layered-accessor attribute-keyword
75 :initarg :keyword
76 :initform nil
77 :layered t)
78 (object
79 :layered-accessor attribute-object
80 :accessor described-object
81 :special t)))
82
83
84 (define-layered-class standard-attribute (attribute)
85 ((label
86 :layered-accessor attribute-label
87 :initarg :label
88 :initform nil
89 :layered t
90 :special t)
91 (label-formatter
92 :layered-accessor attribute-label-formatter
93 :initarg :label-formatter
94 :initform nil
95 :layered t
96 :special t)
97 (function
98 :initarg :function
99 :layered-accessor attribute-function
100 :layered t
101 :special t)
102 (value
103 :layered-accessor attribute-value
104 :initarg :value
105 :layered t
106 :special t)
107 (value-formatter
108 :layered-accessor attribute-value-formatter
109 :initarg :value-formatter
110 :initform nil
111 :layered t
112 :special t)
113 (activep
114 :layered-accessor attribute-active-p
115 :initarg :activep ;depreciated
116 :initarg :active
117 :initform t
118 :layered t
119 :special t
120 :documentation
121 "Can be T, NIL or :WHEN. In the latter case, attribute is only active if the attribute value is non-null.")
122 (active-attributes :layered-accessor attribute-active-attributes
123 :initarg :attributes
124 :layered t
125 :special t)
126 (active-descriptions :layered-accessor attribute-active-descriptions
127 :initarg :activate
128 :initform nil
129 :layered t
130 :special t)
131 (inactive-descriptions :layered-accessor attribute-inactive-descriptions
132 :initarg :deactivate
133 :initform nil
134 :layered t
135 :special t)))
136
137 (define-layered-method attribute-label-formatter :around (attribute)
138 (or (slot-value attribute 'label-formatter)
139 (attribute-value (find-attribute (attribute-description attribute) 'label-formatter))
140 (error "No Formatter .. fool!")))
141
142 (define-layered-method attribute-value-formatter :around (attribute)
143
144 (or (slot-value attribute 'value-formatter)
145 (attribute-value (find-attribute (attribute-description attribute) 'value-formatter))
146 (error "No Formatter .. fool!")))
147
148
149
150 (define-layered-method attribute-object ((attribute standard-attribute))
151 (if (slot-boundp attribute 'object)
152 (call-next-method)
153 (described-object (attribute-description attribute))))
154
155
156 (define-layered-function attribute-value-using-object (object attribute))
157 (define-layered-function (setf attribute-value-using-object) (value object attribute))
158
159 (define-layered-method attribute-value ((attribute standard-attribute))
160 (attribute-value-using-object (attribute-object attribute) attribute))
161
162 (define-layered-method attribute-value-using-object (object attribute)
163 (let ((fn (handler-case (attribute-function attribute)
164 (unbound-slot () nil))))
165 (if fn
166 (funcall fn object)
167 (slot-value attribute 'value))))
168
169 (define-layered-method (setf attribute-value) (value (attribute standard-attribute))
170 (setf (attribute-value-using-object (attribute-object attribute) attribute) value))
171
172 (define-layered-method (setf attribute-value-using-object) (value object attribute)
173 (error "No (SETF ATTRIBUTE-VALUE-USING-OBJECT) for ~A ~A and we are not editable"
174 object attribute))
175
176
177 (defun ensure-access-function (class attribute property)
178 (with-function-access
179 (if (slot-definition-specialp property)
180 (let ((slot-symbol
181 (with-symbol-access
182 (slot-value-using-class
183 class attribute property))))
184 (if (fboundp slot-symbol)
185 (symbol-function slot-symbol)
186 (setf (symbol-function slot-symbol)
187 (property-access-function
188 (attribute-description attribute)
189 (attribute-name attribute)
190 (slot-definition-name property)))))
191 (if (slot-boundp-using-class class attribute property)
192 (slot-value-using-class class attribute property)
193 (setf (slot-value-using-class class attribute property)
194 (property-access-function
195 (attribute-description attribute)
196 (attribute-name attribute)
197 (slot-definition-name property)))))))
198
199 (define-layered-method slot-boundp-using-layer
200 :in-layer (layer t)
201 :around (class (attribute standard-attribute) property reader)
202
203 ; (dprint "Checking boundp ~A ~A" (attribute-name attribute)
204 ; (slot-definition-name property))
205
206 (if (or *symbol-access* *function-access*)
207 (call-next-method)
208 (or (when (slot-definition-specialp property)
209 (with-function-access
210 (slot-boundp-using-class class attribute property)))
211 (if (generic-function-methods
212 (ensure-access-function class attribute property))
213 T
214 NIL))))
215
216 (define-layered-method (setf slot-value-using-layer)
217 :in-layer (context t)
218 :around
219 (new-value class (attribute standard-attribute) property writer)
220
221 ;; (dprint "Setting ~A ~A to : ~A" attribute property new-value)
222
223 (if (or *symbol-access* *function-access*)
224 (call-next-method)
225
226 (if (and (slot-definition-specialp property)
227 (with-function-access
228 (without-symbol-access (slot-boundp-using-class class attribute property))))
229 (with-function-access
230 (call-next-method))
231 (let ((layer
232 ;;FIXME: this is wrong for so many reasons
233 (find-layer (first (remove nil (closer-mop::class-precedence-list (class-of context))
234 :key #'class-name))))
235 (boundp (slot-boundp-using-class class attribute property))
236 (fn (ensure-access-function class attribute property)))
237
238 (when (not boundp)
239 ;; * This slot has never been set before.
240 ;; create a method on property-accessor-function
241 ;; so subclasses can see this new property.
242 (ensure-layered-method
243 (layered-function-definer 'property-access-function)
244 `(lambda (description attribute property)
245 (declare (ignore description attribute property))
246 ,fn)
247 :in-layer layer
248 :specializers
249 (list (class-of
250 (attribute-description attribute))
251 (closer-mop:intern-eql-specializer
252 (attribute-name attribute))
253 (closer-mop:intern-eql-specializer
254 (closer-mop:slot-definition-name property)))))
255
256 ;; specialize this property to this description.
257 ;;(dprint "actrually specializering")
258 (ensure-layered-method
259 fn
260 `(lambda (description)
261 (funcall ,(lambda()
262 new-value)))
263 :in-layer layer
264 :specializers (list (class-of (attribute-description attribute))))
265
266 ;; and return the set value as is custom
267 new-value))))
268
269 (define-layered-method slot-value-using-layer
270 :in-layer (layer t)
271 :around (class (attribute standard-attribute) property reader)
272
273 ; ;(dprint "Getting the slot value of ~A" property)
274 (if (or *symbol-access* *function-access*)
275 (call-next-method)
276 (let ((fn (ensure-access-function class attribute property)))
277
278 (unless (slot-boundp-using-class class attribute property)
279 (slot-unbound class attribute (slot-definition-name property)))
280
281 (if (slot-definition-specialp property)
282 (if (with-function-access
283 (slot-boundp-using-class class attribute property))
284 (with-function-access
285 (slot-value-using-class class attribute property))
286 (funcall fn layer (attribute-description attribute)))
287 (funcall fn layer (attribute-description attribute))))))
288
289
290
291
292
293
294 (defmethod print-object ((object standard-attribute) stream)
295 (print-unreadable-object (object stream :type nil :identity t)
296 (format stream "ATTRIBUTE ~A" (or (ignore-errors (attribute-name object)) "+unnamed-attribute+"))))
297
298 (defgeneric eval-property-initarg (att initarg)
299 (:method ((attribute standard-attribute) initarg)
300 nil)
301 (:method ((attribute standard-attribute) (initarg (eql :function)))
302 t)
303 (:method ((attribute standard-attribute) (initarg (eql :value)))
304 t))
305
306 (defun prepare-initargs (att args)
307 (loop
308 :for (key arg)
309 :on args :by #'cddr
310 :nconc (list key
311 (if (eval-property-initarg att key)
312 (eval arg)
313 arg))))
314
315
316 (defun attribute-value* (attribute)
317 (attribute-value *object* attribute))
318
319 (defmacro with-attributes (names description &body body)
320 `(let ,(loop for name in names collect
321 (list name `(find-attribute ,description ',name)))
322 ,@body))q
323
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