| 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 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)))) |
| 49 | |
| 50 | |
| 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)) |
| 121 | |
| 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)))) |
| 131 | |
| 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) |
| 138 | |
| 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) |
| 210 | |
| 211 | (let ((fn (handler-case (attribute-function attribute) |
| 212 | (unbound-slot () nil)))) |
| 213 | (if fn |
| 214 | (funcall fn object) |
| 215 | (%attribute-value attribute)))) |
| 216 | |
| 217 | (defmethod attribute-description (attribute) |
| 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)))) |
| 223 | |
| 224 | |
| 225 | |
| 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 | |
| 230 | (defgeneric eval-property-initarg (att initarg) |
| 231 | (:method ((attribute standard-attribute) initarg) |
| 232 | nil) |
| 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 | |
| 245 | |
| 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 | |
| 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 | )))) |
| 271 | |
| 272 | (define-layered-method display-using-description |
| 273 | ((attribute standard-attribute) display object &rest args) |
| 274 | (declare (ignore args)) |
| 275 | (when (attribute-label attribute) |
| 276 | (display-attribute-label object attribute)) |
| 277 | (display-attribute-value object attribute)) |
| 278 | |
| 279 | |
| 280 | |
| 281 | |
| 282 | |
| 283 | |
| 284 | |
| 285 | |
| 286 | |
| 287 | |
| 288 | |