-(in-package :lisp-on-lines)
-
-
-(define-layered-class attribute ()
- ())
-
-(defgeneric eval-attribute-initarg (attribute initarg)
- (:method (a i)
- nil))
-
-(defmethod eval-attribute-initarg (attribute (initarg (eql :function)))
- t)
-(define-layered-function attribute-value (object attribute))
-
-
-
-(deflayer LISP-ON-LINES)
-(ensure-active-layer 'lisp-on-lines)
-
-(defvar *standard-direct-slot-initarg-symbols*
- '(:layered :class :in-layer :name :readers :writers :initargs :allow-other-keys :special))
-
-(define-layered-function special-slot-values (description slot-name)
- (:method-combination append))
-
-(define-layered-class attribute-special-layered-direct-slot-definition
- (attribute contextl::special-layered-direct-slot-definition)
- (initargs))
-
-(defmethod shared-initialize :around ((instance attribute-special-layered-direct-slot-definition) slots &rest initargs )
- (setf (slot-value instance 'initargs)
- (apply #'arnesi:remove-keywords initargs *standard-direct-slot-initarg-symbols*))
- (call-next-method))
-
-(define-layered-class standard-attribute
- (attribute contextl::layered-effective-slot-definition-in-layers)
- ((direct-slots)
- (description
- :layered-accessor description-of)
- (label
- :initarg :label
- :layered-accessor attribute-label
- :layered t
- :initform nil)
- (function
- :initarg :function
- :layered-accessor attribute-function
- :layered t)
- (value
- :initarg :value
- :layered t)))
-
-(define-layered-method attribute-value (object attribute)
- (funcall (attribute-function attribute) object))
-
-(defmethod shared-initialize :around ((attribute standard-attribute) slots &rest initargs)
- (declare (ignore initargs))
- (setf (attribute-function attribute)
- (lambda (object)
- (slot-value attribute 'value)))
- (call-next-method))
-
-(defun attribute-name (attribute)
- (closer-mop:slot-definition-name attribute))
-
-(define-layered-method slot-value-using-layer
-; :in-layer lisp-on-lines
- :around (class (attribute standard-attribute) slot reader)
- (loop for (key var) on (special-slot-values (slot-value attribute 'description)
- (attribute-name attribute))
- :if (eq (closer-mop:slot-definition-name slot) key)
- :do (return-from slot-value-using-layer var))
- (call-next-method))
-
-(define-layered-method display-using-description
- ((attribute standard-attribute) display object &rest args)
- (declare (ignore args))
- (format display "~@[~A ~]~A" (attribute-label attribute)
- (attribute-value object attribute)))
-
-
-
-
-
-
-
-
-
+(in-package :lisp-on-lines)
+
+(define-layered-class direct-attribute-definition-class
+ (special-layered-direct-slot-definition
+ contextl::singleton-direct-slot-definition)
+ ((attribute-properties
+ :accessor direct-attribute-properties
+ :documentation "This is an plist to hold the values of
+ the attribute's properties as described by this direct
+ attribute definition.")))
+
+(defmethod initialize-instance
+ :after ((attribute direct-attribute-definition-class)
+ &rest initargs)
+ (setf (direct-attribute-properties attribute) initargs))
+
+(define-layered-class effective-attribute-definition-class
+ (special-layered-effective-slot-definition)
+ ((direct-attributes
+ :accessor attribute-direct-attributes)
+ (attribute-object
+ :accessor slot-definition-attribute-object)
+ (attribute-object-initargs
+ :accessor attribute-object-initargs)))
+
+(defvar *function-access* nil
+ "set/get a place's property function instead of its symbol value
+ when this is set to a non-nil value")
+
+(defmacro with-function-access (&body body)
+ "executes body in an environment with *function-access* set to t"
+ `(let ((*function-access* t))
+ ,@body))
+
+(defmacro without-function-access (&body body)
+ "executes body in an environment with *function-access* set to nil"
+ `(let ((*function-access* nil))
+ ,@body))
+
+(define-layered-function property-access-function (description attribute-name property-name)
+ (:method (description attribute-name property-name)
+ (ensure-layered-function
+ (defining-description
+ (intern (format nil "=PROPERTY-ACCESS-FUNCTION-FOR-~A->~A.~A="
+ (description-print-name description)
+ attribute-name
+ property-name)))
+ :lambda-list '(description))))
+
+
+(defvar *init-time-description* nil)
+
+(defmethod attribute-description :around (attribute)
+ (handler-case (call-next-method)
+ (unbound-slot ()
+ (or
+ *init-time-description*
+ (call-next-method)))))
+
+(define-layered-class attribute ()
+ ((description :initarg :description
+ :accessor attribute-description)
+ (name
+ :layered-accessor attribute-name
+ :initarg :name)
+ (effective-attribute-definition
+ :initarg effective-attribute
+ :accessor attribute-effective-attribute-definition)
+ (attribute-class
+ :accessor attribute-class
+ :initarg :attribute-class
+ :initform 'standard-attribute)
+ (keyword
+ :layered-accessor attribute-keyword
+ :initarg :keyword
+ :initform nil
+ :layered t)
+ (object
+ :layered-accessor attribute-object
+ :accessor described-object
+ :special t)))
+
+
+(define-layered-class standard-attribute (attribute)
+ ((label
+ :layered-accessor attribute-label
+ :initarg :label
+ :initform nil
+ :layered t
+ :special t)
+ (label-formatter
+ :layered-accessor attribute-label-formatter
+ :initarg :label-formatter
+ :initform nil
+ :layered t
+ :special t)
+ (function
+ :initarg :function
+ :layered-accessor attribute-function
+ :layered t
+ :special t)
+ (value
+ :layered-accessor attribute-value
+ :initarg :value
+ :layered t
+ :special t)
+ (value-formatter
+ :layered-accessor attribute-value-formatter
+ :initarg :value-formatter
+ :initform nil
+ :layered t
+ :special t)
+ (activep
+ :layered-accessor attribute-active-p
+ :initarg :activep ;depreciated
+ :initarg :active
+ :initform t
+ :layered t
+ :special t
+ :documentation
+ "Can be T, NIL or :WHEN. In the latter case, attribute is only active if the attribute value is non-null.")
+ (active-attributes :layered-accessor attribute-active-attributes
+ :initarg :attributes
+ :layered t
+ :special t)
+ (active-descriptions :layered-accessor attribute-active-descriptions
+ :initarg :activate
+ :initform nil
+ :layered t
+ :special t)
+ (inactive-descriptions :layered-accessor attribute-inactive-descriptions
+ :initarg :deactivate
+ :initform nil
+ :layered t
+ :special t)))
+
+(define-layered-method attribute-active-p :around (attribute)
+ (let ((active? (call-next-method)))
+ (if (eq :when active?)
+ (not (null (attribute-value attribute)))
+ active?)))
+
+(define-layered-method attribute-label-formatter :around (attribute)
+ (or (slot-value attribute 'label-formatter)
+ (attribute-value (find-attribute (attribute-description attribute) 'label-formatter))
+ (error "No Formatter .. fool!")))
+
+(define-layered-method attribute-value-formatter :around (attribute)
+
+ (or (slot-value attribute 'value-formatter)
+ (attribute-value (find-attribute (attribute-description attribute) 'value-formatter))
+ (error "No Formatter .. fool!")))
+
+
+
+(define-layered-method attribute-object ((attribute standard-attribute))
+ (if (slot-boundp attribute 'object)
+ (call-next-method)
+ (described-object (attribute-description attribute))))
+
+
+(define-layered-function attribute-value-using-object (object attribute))
+(define-layered-function (setf attribute-value-using-object) (value object attribute))
+
+(define-layered-method attribute-value ((attribute standard-attribute))
+ (attribute-value-using-object (attribute-object attribute) attribute))
+
+(define-layered-method attribute-value-using-object (object attribute)
+ (let ((fn (handler-case (attribute-function attribute)
+ (unbound-slot () nil))))
+ (if fn
+ (funcall fn object)
+ (slot-value attribute 'value))))
+
+(define-layered-method (setf attribute-value) (value (attribute standard-attribute))
+ (setf (attribute-value-using-object (attribute-object attribute) attribute) value))
+
+(define-layered-method (setf attribute-value-using-object) (value object attribute)
+ (error "No (SETF ATTRIBUTE-VALUE-USING-OBJECT) for ~A ~A and we are not editable"
+ object attribute))
+
+
+(defun ensure-access-function (class attribute property)
+ (with-function-access
+ (if (slot-definition-specialp property)
+ (let ((slot-symbol
+ (with-symbol-access
+ (slot-value-using-class
+ class attribute property))))
+ (if (fboundp slot-symbol)
+ (symbol-function slot-symbol)
+ (setf (symbol-function slot-symbol)
+ (property-access-function
+ (attribute-description attribute)
+ (attribute-name attribute)
+ (slot-definition-name property)))))
+ (if (slot-boundp-using-class class attribute property)
+ (slot-value-using-class class attribute property)
+ (setf (slot-value-using-class class attribute property)
+ (property-access-function
+ (attribute-description attribute)
+ (attribute-name attribute)
+ (slot-definition-name property)))))))
+
+(define-layered-method slot-boundp-using-layer
+ :in-layer (layer t)
+ :around (class (attribute standard-attribute) property reader)
+
+; (dprint "Checking boundp ~A ~A" (attribute-name attribute)
+ ; (slot-definition-name property))
+
+ (if (or *symbol-access* *function-access*)
+ (call-next-method)
+ (or (when (slot-definition-specialp property)
+ (with-function-access
+ (slot-boundp-using-class class attribute property)))
+ (if (generic-function-methods
+ (ensure-access-function class attribute property))
+ T
+ NIL))))
+
+(define-layered-method (setf slot-value-using-layer)
+ :in-layer (context t)
+ :around
+ (new-value class (attribute standard-attribute) property writer)
+
+;; (dprint "Setting ~A ~A to : ~A" attribute property new-value)
+
+ (if (or *symbol-access* *function-access*)
+ (call-next-method)
+
+ (if (and (slot-definition-specialp property)
+ (with-function-access
+ (without-symbol-access (slot-boundp-using-class class attribute property))))
+ (with-function-access
+ (call-next-method))
+ (let ((layer
+ ;;FIXME: this is wrong for so many reasons
+ (find-layer (first (remove nil (closer-mop::class-precedence-list (class-of context))
+ :key #'class-name))))
+ (boundp (slot-boundp-using-class class attribute property))
+ (fn (ensure-access-function class attribute property)))
+
+ (when (not boundp)
+ ;; * This slot has never been set before.
+ ;; create a method on property-accessor-function
+ ;; so subclasses can see this new property.
+ (ensure-layered-method
+ (layered-function-definer 'property-access-function)
+ `(lambda (description attribute property)
+ (declare (ignore description attribute property))
+ ,fn)
+ :in-layer layer
+ :specializers
+ (list (class-of
+ (attribute-description attribute))
+ (closer-mop:intern-eql-specializer
+ (attribute-name attribute))
+ (closer-mop:intern-eql-specializer
+ (closer-mop:slot-definition-name property)))))
+
+ ;; specialize this property to this description.
+ ;;(dprint "actrually specializering")
+ (ensure-layered-method
+ fn
+ `(lambda (description)
+ (funcall ,(lambda()
+ new-value)))
+ :in-layer layer
+ :specializers (list (class-of (attribute-description attribute))))
+
+ ;; and return the set value as is custom
+ new-value))))
+
+(define-layered-method slot-value-using-layer
+ :in-layer (layer t)
+ :around (class (attribute standard-attribute) property reader)
+
+; ;(dprint "Getting the slot value of ~A" property)
+ (if (or *symbol-access* *function-access*)
+ (call-next-method)
+ (let ((fn (ensure-access-function class attribute property)))
+
+ (unless (slot-boundp-using-class class attribute property)
+ (slot-unbound class attribute (slot-definition-name property)))
+
+ (if (slot-definition-specialp property)
+ (if (with-function-access
+ (slot-boundp-using-class class attribute property))
+ (with-function-access
+ (slot-value-using-class class attribute property))
+ (funcall fn layer (attribute-description attribute)))
+ (handler-case (funcall fn layer (attribute-description attribute))
+ (error ()
+ (warn "Error calling ~A" fn)))))))
+
+
+
+
+
+
+(defmethod print-object ((object standard-attribute) stream)
+ (print-unreadable-object (object stream :type nil :identity t)
+ (format stream "ATTRIBUTE ~A" (or (ignore-errors (attribute-name object)) "+unnamed-attribute+"))))
+
+(defgeneric eval-property-initarg (att initarg)
+ (:method ((attribute standard-attribute) initarg)
+ nil)
+ (:method ((attribute standard-attribute) (initarg (eql :function)))
+ t)
+ (:method ((attribute standard-attribute) (initarg (eql :value)))
+ t))
+
+(defun prepare-initargs (att args)
+ (loop
+ :for (key arg)
+ :on args :by #'cddr
+ :nconc (list key
+ (if (eval-property-initarg att key)
+ (eval arg)
+ arg))))
+
+
+(defun attribute-value* (attribute)
+ (attribute-value *object* attribute))
+
+(defmacro with-attributes (names description &body body)
+ `(let ,(loop for name in names collect
+ (list name `(find-attribute ,description ',name)))
+ ,@body))q
+
+
+
+
+
+
+
+
+
+
+
+
+
HCoop / clinton / lisp-on-lines.git / blobdiff