src/standard-descriptions/clos.lisp

   1 (in-package :lisp-on-lines)
   2
   3 (defstruct unbound-slot-value (s))
   4
   5 (defvar +unbound-slot+ (make-unbound-slot-value))
   6
   7 (defmethod print-object ((object unbound-slot-value) stream)
   8   (print-unreadable-object (object stream)
   9     (format stream "UNBOUND")))
  10
  11 (define-description standard-object ()
  12   ((editp :value t)
  13    (class-slots :label "Slots"
  14                 :function (compose 'class-slots 'class-of))))
  15
  16 (define-description standard-object ()
  17   ((editp :value t)
  18    (class-slots :label "Slots"
  19                 :function (compose 'class-slots 'class-of)))
  20   (:in-description editable))
  21
  22 (define-layered-class slot-definition-attribute (define-description-attribute)
  23  ((slot-name :initarg :slot-name
  24              :accessor attribute-slot-name
  25              :layered t)))
  26
  27
  28 (define-layered-method attribute-active-p :around ((attribute slot-definition-attribute))
  29  (let ((active? (slot-value attribute 'activep)))
  30    (if (and (eq :when active?)
  31             (unbound-slot-value-p (attribute-value attribute)))
  32        NIL
  33
  34        (call-next-method))))
  35
  36 (define-layered-method attribute-active-p
  37  :in-layer #.(defining-description 'editable)
  38  :around ((attribute slot-definition-attribute))
  39  (let ((active? (slot-value attribute 'activep)))
  40    (if (and (eq :when active?)
  41             (unbound-slot-value-p (attribute-value attribute)))
  42        t
  43        (call-next-method))))
  44
  45 (defmethod shared-initialize :around ((object slot-definition-attribute)
  46                                       slots &rest args)
  47   (with-active-descriptions (editable)
  48     (prog1 (call-next-method)
  49       (unless (attribute-setter object)
  50         (setf (attribute-setter object)
  51               (lambda (v o)
  52                 (setf (slot-value o (attribute-slot-name object)) v)))))))
  53
  54
  55 (define-layered-method attribute-value-using-object (object (attribute slot-definition-attribute))
  56   (if (slot-boundp object (attribute-slot-name attribute))
  57
  58       (slot-value object (attribute-slot-name attribute))
  59       +unbound-slot+))
  60
  61 (defun attribute-slot-makunbound (attribute)
  62   (slot-makunbound (attribute-object attribute) (attribute-slot-name attribute)))
  63
  64 (defun ensure-description-for-class (class &key attributes (name (intern (format nil "DESCRIPTION-FOR-~A" (class-name class))))
  65                                      direct-superclasses direct-slot-specs)
  66
  67   (let* ((super-descriptions
  68           (mapcar #'class-of
  69                               (delete nil (mapcar (rcurry #'find-description nil)
  70                                                   (mapcar #'class-name direct-superclasses)))))
  71          (desc-class
  72           (ensure-layer (defining-description name)
  73                 :direct-superclasses (or super-descriptions (list (class-of (find-description 'standard-object))))
  74                 :direct-slots
  75                 (loop
  76                    :for slot in (class-slots class)
  77                    :collect
  78                    (let ((direct-spec
  79                           (find (slot-definition-name slot)
  80                                 direct-slot-specs
  81                                 :key (rcurry 'getf :name))))
  82                      (if direct-spec
  83                          (append (alexandria:remove-from-plist direct-spec
  84                                                                :initfunction
  85                                                                :initform
  86                                                                :initargs
  87                                                                :readers
  88                                                                :writers)
  89                                  (unless
  90                                      (getf direct-spec :attribute-class)
  91                                    (list :attribute-class 'slot-definition-attribute))
  92                                  (unless
  93                                      (getf direct-spec :label)
  94                                    (list :label (format nil
  95                                                         "~@(~A~)" (substitute #\Space #\- (symbol-name (slot-definition-name slot))))))
  96                                  (list :slot-name (slot-definition-name slot)))
  97                          `(:name ,(slot-definition-name slot)
  98                                  :attribute-class slot-definition-attribute
  99                                  :slot-name ,(slot-definition-name slot)
 100                                  :label ,(format nil
 101                                                  "~@(~A~)" (substitute #\Space #\- (symbol-name (slot-definition-name slot)))))))
 102                    :into slots
 103                                  :collect (slot-definition-name slot) :into names
 104                                  :finally (return (cons `(:name active-attributes
 105                                                           :value ',(or attributes names))
 106                                                         slots)))
 107                 :metaclass 'define-description-class)))
 108     (unless (ignore-errors (find-description (class-name class)))
 109       (find-layer  (ensure-layer (defining-description (class-name class))
 110                                  :direct-superclasses (list desc-class)
 111                                  :metaclass 'define-description-class)))))
 112
 113
 114 (defclass described-class ()
 115   ((direct-slot-specs :accessor class-direct-slot-specs)
 116    (attributes :initarg :attributes :initform nil)))
 117
 118 (defmethod ensure-class-using-class :around ((class described-class) name &rest args)
 119
 120   (call-next-method))
 121
 122 (defmethod direct-slot-definition-class ((class described-class) &rest initargs)
 123   (let ((slot-class (call-next-method)))
 124     (make-instance (class-of slot-class) :direct-superclasses (list slot-class (find-class 'described-class-direct-slot-definition)))))
 125
 126 (defclass described-class-direct-slot-definition ()
 127   ())
 128
 129 (defmethod shared-initialize :around ((class described-class-direct-slot-definition) slot-names &key &allow-other-keys)
 130   (call-next-method))
 131
 132 (defmethod validate-superclass
 133            ((class described-class)
 134             (superclass standard-class))
 135   t)
 136
 137 (defmethod initialize-instance :after ((class described-class) &rest initargs &key (direct-superclasses '()) direct-slots)
 138   (declare (dynamic-extent initargs))
 139   (finalize-inheritance class)
 140   (ensure-description-for-class class :direct-slot-specs direct-slots
 141                                       :direct-superclasses  direct-superclasses
 142                                       :attributes (slot-value class 'attributes)))
 143
 144 (defmethod reinitialize-instance :after ((class described-class) &rest initargs &key (direct-superclasses '()) direct-slots)
 145   (declare (dynamic-extent initargs))
 146   (finalize-inheritance class)
 147   (ensure-description-for-class class :direct-slot-specs direct-slots
 148                                       :direct-superclasses direct-superclasses
 149                                       :attributes (slot-value class 'attributes)))
 150
 151 (defclass described-standard-class (described-class standard-class ) ())
 152
 153 (defmethod validate-superclass
 154     ((class described-standard-class)
 155      (superclass standard-class))
 156   t)
 157
 158 (define-layered-method description-of ((object standard-object))
 159   (or (ignore-errors (find-description (class-name (class-of object))))
 160       (find-description 'standard-object)))
 161
 162
 163