| 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-active-p :around (attribute) |
| 138 | (let ((active? (call-next-method))) |
| 139 | (if (eq :when active?) |
| 140 | (not (null (attribute-value attribute))) |
| 141 | active?))) |
| 142 | |
| 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 | |
| 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 | |
| 162 | (define-layered-function attribute-value-using-object (object attribute)) |
| 163 | (define-layered-function (setf attribute-value-using-object) (value object attribute)) |
| 164 | |
| 165 | (define-layered-method attribute-value ((attribute standard-attribute)) |
| 166 | (attribute-value-using-object (attribute-object attribute) attribute)) |
| 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)))) |
| 174 | |
| 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 | |
| 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)) |
| 211 | |
| 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)))) |
| 221 | |
| 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) |
| 228 | |
| 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))) |
| 293 | (handler-case (funcall fn layer (attribute-description attribute)) |
| 294 | (error () |
| 295 | (warn "Error calling ~A" fn))))))) |
| 296 | |
| 297 | |
| 298 | |
| 299 | |
| 300 | |
| 301 | |
| 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 | |
| 306 | (defgeneric eval-property-initarg (att initarg) |
| 307 | (:method ((attribute standard-attribute) initarg) |
| 308 | nil) |
| 309 | (:method ((attribute standard-attribute) (initarg (eql :function))) |
| 310 | t) |
| 311 | (:method ((attribute standard-attribute) (initarg (eql :value))) |
| 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 | |
| 323 | |
| 324 | (defun attribute-value* (attribute) |
| 325 | (attribute-value *object* attribute)) |
| 326 | |
| 327 | (defmacro with-attributes (names description &body body) |
| 328 | `(let ,(loop for name in names collect |
| 329 | (list name `(find-attribute ,description ',name))) |
| 330 | ,@body)) |
| 331 | |
| 332 | |
| 333 | |
| 334 | |
| 335 | |
| 336 | |
| 337 | |
| 338 | |
| 339 | |
| 340 | |
| 341 | |
| 342 | |
| 343 | |