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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 |
22 | :accessor 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 "~A-~A-~A" |
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 | (define-layered-class standard-attribute () |
52 | ((description-class :initarg description-class) |
53 | (name |
54 | :layered-accessor attribute-name |
55 | :initarg :name) |
56 | (effective-attribute-definition |
57 | :initarg effective-attribute |
58 | :accessor attribute-effective-attribute-definition) |
59 | (attribute-class |
60 | :accessor attribute-class |
61 | :initarg :attribute-class |
62 | :initform 'standard-attribute |
63 | :layered t) |
64 | (label |
65 | :layered-accessor attribute-label |
66 | :initarg :label |
67 | :initform nil |
68 | :layered t |
69 | :special t) |
70 | (function |
71 | :initarg :function |
72 | :layered-accessor attribute-function |
73 | :layered t |
74 | :special t) |
75 | (value |
76 | :layered-accessor %attribute-value |
77 | :initarg :value |
78 | :layered t |
79 | :special t) |
80 | (activep |
81 | :layered-accessor attribute-active-p |
82 | :initarg :activep |
83 | :initform t |
84 | :layered t |
85 | :special t) |
86 | (keyword |
87 | :layered-accessor attribute-keyword |
88 | :initarg :keyword |
89 | :initform nil |
90 | :layered t) |
91 | )) |
92 | |
93 | (defun ensure-access-function (class attribute property) |
94 | (with-function-access |
95 | (if (slot-definition-specialp property) |
96 | (let ((slot-symbol |
97 | (with-symbol-access |
98 | (slot-value-using-class |
99 | class attribute property)))) |
100 | (if (fboundp slot-symbol) |
101 | (symbol-function slot-symbol) |
102 | (setf (symbol-function slot-symbol) |
103 | (property-access-function |
104 | (attribute-description attribute) |
105 | (attribute-name attribute) |
106 | (slot-definition-name property))))) |
107 | (if (slot-boundp-using-class class attribute property) |
108 | (slot-value-using-class class attribute property) |
109 | (setf (slot-value-using-class class attribute property) |
110 | (property-access-function |
111 | (attribute-description attribute) |
112 | (attribute-name attribute) |
113 | (slot-definition-name property))))))) |
114 | |
115 | (define-layered-method slot-boundp-using-layer |
116 | :in-layer (layer t) |
117 | :around (class (attribute standard-attribute) property reader) |
118 | |
119 | ; (dprint "Checking boundp ~A ~A" (attribute-name attribute) |
120 | ; (slot-definition-name property)) |
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121 | |
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122 | (if (or *symbol-access* *function-access*) |
123 | (call-next-method) |
124 | (or (when (slot-definition-specialp property) |
125 | (with-function-access |
126 | (slot-boundp-using-class class attribute property))) |
127 | (if (generic-function-methods |
128 | (ensure-access-function class attribute property)) |
129 | T |
130 | NIL)))) |
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131 | |
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132 | (define-layered-method (setf slot-value-using-layer) |
133 | :in-layer (context t) |
134 | :around |
135 | (new-value class (attribute standard-attribute) property writer) |
136 | |
137 | ;; (dprint "Setting ~A ~A to : ~A" attribute property new-value) |
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138 | |
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139 | (if (or *symbol-access* *function-access*) |
140 | (call-next-method) |
141 | |
142 | (if (and (slot-definition-specialp property) |
143 | (with-function-access |
144 | (without-symbol-access (slot-boundp-using-class class attribute property)))) |
145 | (with-function-access |
146 | (call-next-method)) |
147 | (let ((layer |
148 | ;;FIXME: this is wrong for so many reasons |
149 | (find-layer (first (remove nil (closer-mop::class-precedence-list (class-of context)) |
150 | :key #'class-name)))) |
151 | (boundp (slot-boundp-using-class class attribute property)) |
152 | (fn (ensure-access-function class attribute property))) |
153 | |
154 | (when (not boundp) |
155 | ;; * This slot has never been set before. |
156 | ;; create a method on property-accessor-function |
157 | ;; so subclasses can see this new property. |
158 | (ensure-layered-method |
159 | (layered-function-definer 'property-access-function) |
160 | `(lambda (description attribute property) |
161 | (declare (ignore description attribute property)) |
162 | ,fn) |
163 | :in-layer layer |
164 | :specializers |
165 | (list (class-of |
166 | (attribute-description attribute)) |
167 | (closer-mop:intern-eql-specializer |
168 | (attribute-name attribute)) |
169 | (closer-mop:intern-eql-specializer |
170 | (closer-mop:slot-definition-name property))))) |
171 | |
172 | ;; specialize this property to this description. |
173 | ;;(dprint "actrually specializering") |
174 | (ensure-layered-method |
175 | fn |
176 | `(lambda (description) |
177 | (funcall ,(lambda() |
178 | new-value))) |
179 | :in-layer layer |
180 | :specializers (list (class-of (attribute-description attribute)))) |
181 | |
182 | ;; and return the set value as is custom |
183 | new-value)))) |
184 | |
185 | (define-layered-method slot-value-using-layer |
186 | :in-layer (layer t) |
187 | :around (class (attribute standard-attribute) property reader) |
188 | |
189 | ; ;(dprint "Getting the slot value of ~A" property) |
190 | (if (or *symbol-access* *function-access*) |
191 | (call-next-method) |
192 | (let ((fn (ensure-access-function class attribute property))) |
193 | |
194 | (unless (slot-boundp-using-class class attribute property) |
195 | (slot-unbound class attribute (slot-definition-name property))) |
196 | |
197 | (if (slot-definition-specialp property) |
198 | (if (with-function-access |
199 | (slot-boundp-using-class class attribute property)) |
200 | (with-function-access |
201 | (slot-value-using-class class attribute property)) |
202 | (funcall fn layer (attribute-description attribute))) |
203 | (funcall fn layer (attribute-description attribute)))))) |
204 | |
205 | |
206 | |
207 | (define-layered-function attribute-value (object attribute)) |
208 | |
209 | (define-layered-method attribute-value (object attribute) |
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210 | |
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211 | (let ((fn (handler-case (attribute-function attribute) |
212 | (unbound-slot () nil)))) |
213 | (if fn |
214 | (funcall fn object) |
215 | (%attribute-value attribute)))) |
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216 | |
217 | (defmethod attribute-description (attribute) |
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218 | ;(break "description for ~A is (slot-value attribute 'description-name)") |
219 | (find-layer (slot-value attribute 'description-class)) |
220 | #+nil (let ((name (slot-value attribute 'description-name))) |
221 | (when name |
222 | (find-description name)))) |
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223 | |
224 | |
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225 | |
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226 | (defmethod print-object ((object standard-attribute) stream) |
227 | (print-unreadable-object (object stream :type nil :identity t) |
228 | (format stream "ATTRIBUTE ~A" (or (ignore-errors (attribute-name object)) "+unnamed-attribute+")))) |
229 | |
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230 | (defgeneric eval-property-initarg (att initarg) |
231 | (:method ((attribute standard-attribute) initarg) |
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232 | nil) |
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233 | (:method ((attribute standard-attribute) (initarg (eql :function))) |
234 | t)) |
235 | |
236 | (defun prepare-initargs (att args) |
237 | (loop |
238 | :for (key arg) |
239 | :on args :by #'cddr |
240 | :nconc (list key |
241 | (if (eval-property-initarg att key) |
242 | (eval arg) |
243 | arg)))) |
244 | |
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245 | |
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246 | (defun attribute-value* (attribute) |
247 | (attribute-value *object* attribute)) |
248 | |
249 | (defmacro with-attributes (names description &body body) |
250 | `(with-slots ,names ,description ,@body)) |
251 | |
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252 | (define-layered-function display-attribute (object attribute) |
253 | (:method (object attribute) |
254 | (display-using-description attribute *display* object))) |
255 | |
256 | (define-layered-function display-attribute-label (object attribute) |
257 | (:method (object attribute) |
258 | (format *display* "~A " (attribute-label attribute)) |
259 | )) |
260 | |
261 | (define-layered-function display-attribute-value (object attribute) |
262 | (:method (object attribute) |
263 | (let ((val (attribute-value object attribute))) |
264 | (if (eq val object) |
265 | (format *display* "~A " val) |
266 | (with-active-descriptions (inline) |
267 | (display *display* val ) |
268 | |
269 | ) |
270 | )))) |
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271 | |
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272 | (define-layered-method display-using-description |
273 | ((attribute standard-attribute) display object &rest args) |
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274 | (declare (ignore args)) |
275 | (when (attribute-label attribute) |
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276 | (display-attribute-label object attribute)) |
277 | (display-attribute-value object attribute)) |
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278 | |
279 | |
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280 | |
281 | |
282 | |
283 | |
284 | |
285 | |
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288 | |