e7c5f95a |
1 | (in-package :lisp-on-lines) |
2 | |
4358148e |
3 | (define-layered-class direct-attribute-definition-class |
6de8d300 |
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 |
e8d4fa45 |
22 | :accessor slot-definition-attribute-object) |
6de8d300 |
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 |
e8d4fa45 |
44 | (intern (format nil "=PROPERTY-ACCESS-FUNCTION-FOR-~A->~A.~A=" |
6de8d300 |
45 | (description-print-name description) |
46 | attribute-name |
47 | property-name))) |
48 | :lambda-list '(description)))) |
e7c5f95a |
49 | |
e7c5f95a |
50 | |
e8d4fa45 |
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 | q (call-next-method))))) |
59 | |
60 | (define-layered-class attribute () |
61 | ((description :initarg :description |
62 | :accessor attribute-description) |
6de8d300 |
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 | :layered t) |
e8d4fa45 |
74 | (keyword |
75 | :layered-accessor attribute-keyword |
76 | :initarg :keyword |
77 | :initform nil |
78 | :layered t) |
79 | (object |
80 | :layered-accessor attribute-object |
81 | :accessor described-object |
82 | :special t))) |
83 | |
84 | |
85 | |
86 | |
87 | (define-layered-class standard-attribute (attribute) |
88 | ((label |
6de8d300 |
89 | :layered-accessor attribute-label |
90 | :initarg :label |
91 | :initform nil |
92 | :layered t |
93 | :special t) |
94 | (function |
95 | :initarg :function |
96 | :layered-accessor attribute-function |
97 | :layered t |
98 | :special t) |
99 | (value |
e8d4fa45 |
100 | :layered-accessor attribute-value |
6de8d300 |
101 | :initarg :value |
102 | :layered t |
103 | :special t) |
104 | (activep |
105 | :layered-accessor attribute-active-p |
e8d4fa45 |
106 | :initarg :activep ;depreciated |
107 | :initarg :active |
6de8d300 |
108 | :initform t |
109 | :layered t |
e8d4fa45 |
110 | :special t |
111 | :documentation |
112 | "Can be T, NIL or :WHEN. In the latter case, attribute is only active if the attribute value is non-null."))) |
113 | |
114 | |
115 | (define-layered-method attribute-object ((attribute standard-attribute)) |
116 | (if (slot-boundp attribute 'object) |
117 | (call-next-method) |
118 | (described-object (attribute-description attribute)))) |
119 | |
120 | |
121 | (define-layered-method attribute-value ((attribute standard-attribute)) |
122 | (attribute-value-using-object (attribute-object attribute) attribute)) |
123 | |
124 | (define-layered-function attribute-value-using-object (object attribute)) |
125 | |
126 | (define-layered-method attribute-value-using-object (object attribute) |
127 | (let ((fn (handler-case (attribute-function attribute) |
128 | (unbound-slot () nil)))) |
129 | (if fn |
130 | (funcall fn object) |
131 | (slot-value attribute 'value)))) |
6de8d300 |
132 | |
133 | (defun ensure-access-function (class attribute property) |
134 | (with-function-access |
135 | (if (slot-definition-specialp property) |
136 | (let ((slot-symbol |
137 | (with-symbol-access |
138 | (slot-value-using-class |
139 | class attribute property)))) |
140 | (if (fboundp slot-symbol) |
141 | (symbol-function slot-symbol) |
142 | (setf (symbol-function slot-symbol) |
143 | (property-access-function |
144 | (attribute-description attribute) |
145 | (attribute-name attribute) |
146 | (slot-definition-name property))))) |
147 | (if (slot-boundp-using-class class attribute property) |
148 | (slot-value-using-class class attribute property) |
149 | (setf (slot-value-using-class class attribute property) |
150 | (property-access-function |
151 | (attribute-description attribute) |
152 | (attribute-name attribute) |
153 | (slot-definition-name property))))))) |
154 | |
155 | (define-layered-method slot-boundp-using-layer |
156 | :in-layer (layer t) |
157 | :around (class (attribute standard-attribute) property reader) |
158 | |
159 | ; (dprint "Checking boundp ~A ~A" (attribute-name attribute) |
160 | ; (slot-definition-name property)) |
e7c5f95a |
161 | |
6de8d300 |
162 | (if (or *symbol-access* *function-access*) |
163 | (call-next-method) |
164 | (or (when (slot-definition-specialp property) |
165 | (with-function-access |
166 | (slot-boundp-using-class class attribute property))) |
167 | (if (generic-function-methods |
168 | (ensure-access-function class attribute property)) |
169 | T |
170 | NIL)))) |
e7c5f95a |
171 | |
6de8d300 |
172 | (define-layered-method (setf slot-value-using-layer) |
173 | :in-layer (context t) |
174 | :around |
175 | (new-value class (attribute standard-attribute) property writer) |
176 | |
177 | ;; (dprint "Setting ~A ~A to : ~A" attribute property new-value) |
e7c5f95a |
178 | |
6de8d300 |
179 | (if (or *symbol-access* *function-access*) |
180 | (call-next-method) |
181 | |
182 | (if (and (slot-definition-specialp property) |
183 | (with-function-access |
184 | (without-symbol-access (slot-boundp-using-class class attribute property)))) |
185 | (with-function-access |
186 | (call-next-method)) |
187 | (let ((layer |
188 | ;;FIXME: this is wrong for so many reasons |
189 | (find-layer (first (remove nil (closer-mop::class-precedence-list (class-of context)) |
190 | :key #'class-name)))) |
191 | (boundp (slot-boundp-using-class class attribute property)) |
192 | (fn (ensure-access-function class attribute property))) |
193 | |
194 | (when (not boundp) |
195 | ;; * This slot has never been set before. |
196 | ;; create a method on property-accessor-function |
197 | ;; so subclasses can see this new property. |
198 | (ensure-layered-method |
199 | (layered-function-definer 'property-access-function) |
200 | `(lambda (description attribute property) |
201 | (declare (ignore description attribute property)) |
202 | ,fn) |
203 | :in-layer layer |
204 | :specializers |
205 | (list (class-of |
206 | (attribute-description attribute)) |
207 | (closer-mop:intern-eql-specializer |
208 | (attribute-name attribute)) |
209 | (closer-mop:intern-eql-specializer |
210 | (closer-mop:slot-definition-name property))))) |
211 | |
212 | ;; specialize this property to this description. |
213 | ;;(dprint "actrually specializering") |
214 | (ensure-layered-method |
215 | fn |
216 | `(lambda (description) |
217 | (funcall ,(lambda() |
218 | new-value))) |
219 | :in-layer layer |
220 | :specializers (list (class-of (attribute-description attribute)))) |
221 | |
222 | ;; and return the set value as is custom |
223 | new-value)))) |
224 | |
225 | (define-layered-method slot-value-using-layer |
226 | :in-layer (layer t) |
227 | :around (class (attribute standard-attribute) property reader) |
228 | |
229 | ; ;(dprint "Getting the slot value of ~A" property) |
230 | (if (or *symbol-access* *function-access*) |
231 | (call-next-method) |
232 | (let ((fn (ensure-access-function class attribute property))) |
233 | |
234 | (unless (slot-boundp-using-class class attribute property) |
235 | (slot-unbound class attribute (slot-definition-name property))) |
236 | |
237 | (if (slot-definition-specialp property) |
238 | (if (with-function-access |
239 | (slot-boundp-using-class class attribute property)) |
240 | (with-function-access |
241 | (slot-value-using-class class attribute property)) |
242 | (funcall fn layer (attribute-description attribute))) |
243 | (funcall fn layer (attribute-description attribute)))))) |
244 | |
245 | |
246 | |
4358148e |
247 | |
248 | |
4358148e |
249 | |
4358148e |
250 | (defmethod print-object ((object standard-attribute) stream) |
251 | (print-unreadable-object (object stream :type nil :identity t) |
252 | (format stream "ATTRIBUTE ~A" (or (ignore-errors (attribute-name object)) "+unnamed-attribute+")))) |
253 | |
4271ab0b |
254 | (defgeneric eval-property-initarg (att initarg) |
255 | (:method ((attribute standard-attribute) initarg) |
6de8d300 |
256 | nil) |
4271ab0b |
257 | (:method ((attribute standard-attribute) (initarg (eql :function))) |
258 | t)) |
259 | |
260 | (defun prepare-initargs (att args) |
261 | (loop |
262 | :for (key arg) |
263 | :on args :by #'cddr |
264 | :nconc (list key |
265 | (if (eval-property-initarg att key) |
266 | (eval arg) |
267 | arg)))) |
268 | |
4358148e |
269 | |
4358148e |
270 | (defun attribute-value* (attribute) |
271 | (attribute-value *object* attribute)) |
272 | |
273 | (defmacro with-attributes (names description &body body) |
274 | `(with-slots ,names ,description ,@body)) |
275 | |
e8d4fa45 |
276 | |
4358148e |
277 | |
278 | |
e7c5f95a |
279 | |
280 | |
281 | |
282 | |
283 | |
284 | |
285 | |
286 | |
287 | |