| 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 | (if (unbound-slot-value-p v) |
| 53 | (slot-makunbound o (attribute-slot-name object)) |
| 54 | (setf (slot-value o (attribute-slot-name object)) v)))))))) |
| 55 | |
| 56 | |
| 57 | (define-layered-method attribute-value-using-object (object (attribute slot-definition-attribute)) |
| 58 | (if (slot-boundp object (attribute-slot-name attribute)) |
| 59 | |
| 60 | (slot-value object (attribute-slot-name attribute)) |
| 61 | +unbound-slot+)) |
| 62 | |
| 63 | (defun attribute-slot-makunbound (attribute) |
| 64 | (slot-makunbound (attribute-object attribute) (attribute-slot-name attribute))) |
| 65 | |
| 66 | (defun ensure-description-for-class (class &key attributes (name (intern (format nil "DESCRIPTION-FOR-~A" (class-name class)))) |
| 67 | direct-superclasses direct-slot-specs) |
| 68 | |
| 69 | (let* ((super-descriptions |
| 70 | (mapcar #'class-of |
| 71 | (delete nil (mapcar (rcurry #'find-description nil) |
| 72 | (mapcar #'class-name direct-superclasses))))) |
| 73 | (desc-class |
| 74 | (ensure-layer (defining-description name) |
| 75 | :direct-superclasses (or super-descriptions (list (class-of (find-description 'standard-object)))) |
| 76 | :direct-slots |
| 77 | (loop |
| 78 | :for slot in (class-slots class) |
| 79 | :collect |
| 80 | (let ((direct-spec |
| 81 | (find (slot-definition-name slot) |
| 82 | direct-slot-specs |
| 83 | :key (rcurry 'getf :name)))) |
| 84 | (if direct-spec |
| 85 | (append (alexandria:remove-from-plist direct-spec |
| 86 | :initfunction |
| 87 | :initform |
| 88 | :initargs |
| 89 | :readers |
| 90 | :writers) |
| 91 | (unless |
| 92 | (getf direct-spec :attribute-class) |
| 93 | (list :attribute-class 'slot-definition-attribute)) |
| 94 | (unless |
| 95 | (getf direct-spec :label) |
| 96 | (list :label (format nil |
| 97 | "~@(~A~)" (substitute #\Space #\- (symbol-name (slot-definition-name slot)))))) |
| 98 | (list :slot-name (slot-definition-name slot))) |
| 99 | `(:name ,(slot-definition-name slot) |
| 100 | :attribute-class slot-definition-attribute |
| 101 | :slot-name ,(slot-definition-name slot) |
| 102 | :label ,(format nil |
| 103 | "~@(~A~)" (substitute #\Space #\- (symbol-name (slot-definition-name slot))))))) |
| 104 | :into slots |
| 105 | :collect (slot-definition-name slot) :into names |
| 106 | :finally (return (cons `(:name active-attributes |
| 107 | :value ',(or attributes names)) |
| 108 | slots))) |
| 109 | :metaclass 'define-description-class))) |
| 110 | (unless (ignore-errors (find-description (class-name class))) |
| 111 | (find-layer (ensure-layer (defining-description (class-name class)) |
| 112 | :direct-superclasses (list desc-class) |
| 113 | :metaclass 'define-description-class))))) |
| 114 | |
| 115 | |
| 116 | (defclass described-class () |
| 117 | ((direct-slot-specs :accessor class-direct-slot-specs) |
| 118 | (attributes :initarg :attributes :initform nil))) |
| 119 | |
| 120 | (defmethod ensure-class-using-class :around ((class described-class) name &rest args) |
| 121 | |
| 122 | (call-next-method)) |
| 123 | |
| 124 | (defmethod direct-slot-definition-class ((class described-class) &rest initargs) |
| 125 | (let ((slot-class (call-next-method))) |
| 126 | (make-instance (class-of slot-class) :direct-superclasses (list slot-class (find-class 'described-class-direct-slot-definition))))) |
| 127 | |
| 128 | (defclass described-class-direct-slot-definition () |
| 129 | ()) |
| 130 | |
| 131 | (defmethod shared-initialize :around ((class described-class-direct-slot-definition) slot-names &key &allow-other-keys) |
| 132 | (call-next-method)) |
| 133 | |
| 134 | (defmethod validate-superclass |
| 135 | ((class described-class) |
| 136 | (superclass standard-class)) |
| 137 | t) |
| 138 | |
| 139 | (defmethod initialize-instance :after ((class described-class) &rest initargs &key (direct-superclasses '()) direct-slots) |
| 140 | (declare (dynamic-extent initargs)) |
| 141 | (finalize-inheritance class) |
| 142 | (ensure-description-for-class class :direct-slot-specs direct-slots |
| 143 | :direct-superclasses direct-superclasses |
| 144 | :attributes (slot-value class 'attributes))) |
| 145 | |
| 146 | (defmethod reinitialize-instance :after ((class described-class) &rest initargs &key (direct-superclasses '()) direct-slots) |
| 147 | (declare (dynamic-extent initargs)) |
| 148 | (finalize-inheritance class) |
| 149 | (ensure-description-for-class class :direct-slot-specs direct-slots |
| 150 | :direct-superclasses direct-superclasses |
| 151 | :attributes (slot-value class 'attributes))) |
| 152 | |
| 153 | (defclass described-standard-class (described-class standard-class ) ()) |
| 154 | |
| 155 | (defmethod validate-superclass |
| 156 | ((class described-standard-class) |
| 157 | (superclass standard-class)) |
| 158 | t) |
| 159 | |
| 160 | (define-layered-method description-of ((object standard-object)) |
| 161 | (or (ignore-errors (find-description (class-name (class-of object)))) |
| 162 | (find-description 'standard-object))) |
| 163 | |
| 164 | |
| 165 | |