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1 | (in-package :lisp-on-lines) |
2 | |
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3 | (define-layered-class direct-attribute-definition-class |
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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 |
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22 | :accessor slot-definition-attribute-object) |
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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 |
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44 | (intern (format nil "=PROPERTY-ACCESS-FUNCTION-FOR-~A->~A.~A=" |
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45 | (description-print-name description) |
46 | attribute-name |
47 | property-name))) |
48 | :lambda-list '(description)))) |
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49 | |
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50 | |
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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* |
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58 | (call-next-method))))) |
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59 | |
60 | (define-layered-class attribute () |
61 | ((description :initarg :description |
62 | :accessor attribute-description) |
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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 |
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72 | :initform 'standard-attribute) |
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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 | |
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84 | (define-layered-class standard-attribute (attribute) |
85 | ((label |
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86 | :layered-accessor attribute-label |
87 | :initarg :label |
88 | :initform nil |
89 | :layered t |
90 | :special t) |
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91 | (label-formatter |
92 | :layered-accessor attribute-label-formatter |
93 | :initarg :label-formatter |
94 | :initform nil |
95 | :layered t |
96 | :special t) |
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97 | (function |
98 | :initarg :function |
99 | :layered-accessor attribute-function |
100 | :layered t |
101 | :special t) |
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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) |
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113 | (activep |
114 | :layered-accessor attribute-active-p |
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115 | :initarg :activep ;depreciated |
116 | :initarg :active |
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117 | :initform t |
118 | :layered t |
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119 | :special t |
120 | :documentation |
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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 | |
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137 | (define-layered-method attribute-active-p :around (attribute) |
138 | (let ((active? (call-next-method))) |
139 | (if (eq :when active?) |
140 | (not (null (attribute-value attribute))) |
141 | active?))) |
142 | |
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143 | (define-layered-method attribute-label-formatter :around (attribute) |
144 | (or (slot-value attribute 'label-formatter) |
145 | (attribute-value (find-attribute (attribute-description attribute) 'label-formatter)) |
146 | (error "No Formatter .. fool!"))) |
147 | |
148 | (define-layered-method attribute-value-formatter :around (attribute) |
149 | |
150 | (or (slot-value attribute 'value-formatter) |
151 | (attribute-value (find-attribute (attribute-description attribute) 'value-formatter)) |
152 | (error "No Formatter .. fool!"))) |
153 | |
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154 | |
155 | |
156 | (define-layered-method attribute-object ((attribute standard-attribute)) |
157 | (if (slot-boundp attribute 'object) |
158 | (call-next-method) |
159 | (described-object (attribute-description attribute)))) |
160 | |
161 | |
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162 | (define-layered-function attribute-value-using-object (object attribute)) |
163 | (define-layered-function (setf attribute-value-using-object) (value object attribute)) |
164 | |
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165 | (define-layered-method attribute-value ((attribute standard-attribute)) |
166 | (attribute-value-using-object (attribute-object attribute) attribute)) |
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167 | |
168 | (define-layered-method attribute-value-using-object (object attribute) |
169 | (let ((fn (handler-case (attribute-function attribute) |
170 | (unbound-slot () nil)))) |
171 | (if fn |
172 | (funcall fn object) |
173 | (slot-value attribute 'value)))) |
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174 | |
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175 | (define-layered-method (setf attribute-value) (value (attribute standard-attribute)) |
176 | (setf (attribute-value-using-object (attribute-object attribute) attribute) value)) |
177 | |
178 | (define-layered-method (setf attribute-value-using-object) (value object attribute) |
179 | (error "No (SETF ATTRIBUTE-VALUE-USING-OBJECT) for ~A ~A and we are not editable" |
180 | object attribute)) |
181 | |
182 | |
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183 | (defun ensure-access-function (class attribute property) |
184 | (with-function-access |
185 | (if (slot-definition-specialp property) |
186 | (let ((slot-symbol |
187 | (with-symbol-access |
188 | (slot-value-using-class |
189 | class attribute property)))) |
190 | (if (fboundp slot-symbol) |
191 | (symbol-function slot-symbol) |
192 | (setf (symbol-function slot-symbol) |
193 | (property-access-function |
194 | (attribute-description attribute) |
195 | (attribute-name attribute) |
196 | (slot-definition-name property))))) |
197 | (if (slot-boundp-using-class class attribute property) |
198 | (slot-value-using-class class attribute property) |
199 | (setf (slot-value-using-class class attribute property) |
200 | (property-access-function |
201 | (attribute-description attribute) |
202 | (attribute-name attribute) |
203 | (slot-definition-name property))))))) |
204 | |
205 | (define-layered-method slot-boundp-using-layer |
206 | :in-layer (layer t) |
207 | :around (class (attribute standard-attribute) property reader) |
208 | |
209 | ; (dprint "Checking boundp ~A ~A" (attribute-name attribute) |
210 | ; (slot-definition-name property)) |
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211 | |
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212 | (if (or *symbol-access* *function-access*) |
213 | (call-next-method) |
214 | (or (when (slot-definition-specialp property) |
215 | (with-function-access |
216 | (slot-boundp-using-class class attribute property))) |
217 | (if (generic-function-methods |
218 | (ensure-access-function class attribute property)) |
219 | T |
220 | NIL)))) |
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221 | |
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222 | (define-layered-method (setf slot-value-using-layer) |
223 | :in-layer (context t) |
224 | :around |
225 | (new-value class (attribute standard-attribute) property writer) |
226 | |
227 | ;; (dprint "Setting ~A ~A to : ~A" attribute property new-value) |
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228 | |
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229 | (if (or *symbol-access* *function-access*) |
230 | (call-next-method) |
231 | |
232 | (if (and (slot-definition-specialp property) |
233 | (with-function-access |
234 | (without-symbol-access (slot-boundp-using-class class attribute property)))) |
235 | (with-function-access |
236 | (call-next-method)) |
237 | (let ((layer |
238 | ;;FIXME: this is wrong for so many reasons |
239 | (find-layer (first (remove nil (closer-mop::class-precedence-list (class-of context)) |
240 | :key #'class-name)))) |
241 | (boundp (slot-boundp-using-class class attribute property)) |
242 | (fn (ensure-access-function class attribute property))) |
243 | |
244 | (when (not boundp) |
245 | ;; * This slot has never been set before. |
246 | ;; create a method on property-accessor-function |
247 | ;; so subclasses can see this new property. |
248 | (ensure-layered-method |
249 | (layered-function-definer 'property-access-function) |
250 | `(lambda (description attribute property) |
251 | (declare (ignore description attribute property)) |
252 | ,fn) |
253 | :in-layer layer |
254 | :specializers |
255 | (list (class-of |
256 | (attribute-description attribute)) |
257 | (closer-mop:intern-eql-specializer |
258 | (attribute-name attribute)) |
259 | (closer-mop:intern-eql-specializer |
260 | (closer-mop:slot-definition-name property))))) |
261 | |
262 | ;; specialize this property to this description. |
263 | ;;(dprint "actrually specializering") |
264 | (ensure-layered-method |
265 | fn |
266 | `(lambda (description) |
267 | (funcall ,(lambda() |
268 | new-value))) |
269 | :in-layer layer |
270 | :specializers (list (class-of (attribute-description attribute)))) |
271 | |
272 | ;; and return the set value as is custom |
273 | new-value)))) |
274 | |
275 | (define-layered-method slot-value-using-layer |
276 | :in-layer (layer t) |
277 | :around (class (attribute standard-attribute) property reader) |
278 | |
279 | ; ;(dprint "Getting the slot value of ~A" property) |
280 | (if (or *symbol-access* *function-access*) |
281 | (call-next-method) |
282 | (let ((fn (ensure-access-function class attribute property))) |
283 | |
284 | (unless (slot-boundp-using-class class attribute property) |
285 | (slot-unbound class attribute (slot-definition-name property))) |
286 | |
287 | (if (slot-definition-specialp property) |
288 | (if (with-function-access |
289 | (slot-boundp-using-class class attribute property)) |
290 | (with-function-access |
291 | (slot-value-using-class class attribute property)) |
292 | (funcall fn layer (attribute-description attribute))) |
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293 | (handler-case (funcall fn layer (attribute-description attribute)) |
294 | (error () |
295 | (warn "Error calling ~A" fn))))))) |
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296 | |
297 | |
298 | |
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299 | |
300 | |
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301 | |
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302 | (defmethod print-object ((object standard-attribute) stream) |
303 | (print-unreadable-object (object stream :type nil :identity t) |
304 | (format stream "ATTRIBUTE ~A" (or (ignore-errors (attribute-name object)) "+unnamed-attribute+")))) |
305 | |
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306 | (defgeneric eval-property-initarg (att initarg) |
307 | (:method ((attribute standard-attribute) initarg) |
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308 | nil) |
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309 | (:method ((attribute standard-attribute) (initarg (eql :function))) |
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310 | t) |
311 | (:method ((attribute standard-attribute) (initarg (eql :value))) |
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312 | t)) |
313 | |
314 | (defun prepare-initargs (att args) |
315 | (loop |
316 | :for (key arg) |
317 | :on args :by #'cddr |
318 | :nconc (list key |
319 | (if (eval-property-initarg att key) |
320 | (eval arg) |
321 | arg)))) |
322 | |
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323 | |
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324 | (defun attribute-value* (attribute) |
325 | (attribute-value *object* attribute)) |
326 | |
327 | (defmacro with-attributes (names description &body body) |
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328 | `(let ,(loop for name in names collect |
329 | (list name `(find-attribute ,description ',name))) |
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330 | ,@body)) |
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331 | |
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332 | |
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333 | |
334 | |
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335 | |
336 | |
337 | |
338 | |
339 | |
340 | |
341 | |
342 | |
343 | |