| 1 | (in-package :lisp-on-lines) |
| 2 | |
| 3 | (define-layered-function description-of (thing) |
| 4 | (:method (thing) |
| 5 | (find-description 't))) |
| 6 | |
| 7 | (defun description-print-name (description) |
| 8 | (description-class-name (class-of description))) |
| 9 | |
| 10 | (defun find-attribute (description attribute-name) |
| 11 | (when (slot-exists-p description attribute-name) |
| 12 | (slot-value description attribute-name))) |
| 13 | |
| 14 | |
| 15 | (defun description-attributes (description) |
| 16 | (mapcar (curry |
| 17 | #'slot-value-using-class |
| 18 | (class-of 'description) |
| 19 | description) |
| 20 | (class-slots (class-of description)))) |
| 21 | |
| 22 | |
| 23 | |
| 24 | (define-layered-function attributes (description) |
| 25 | (:method (description) |
| 26 | (let* ((active-attributes |
| 27 | (find-attribute description 'active-attributes)) |
| 28 | (attributes (when active-attributes |
| 29 | (attribute-value *object* active-attributes)))) |
| 30 | (if attributes |
| 31 | (mapcar (lambda (spec) |
| 32 | (find-attribute |
| 33 | description |
| 34 | (if (listp spec) |
| 35 | (car spec) |
| 36 | spec))) |
| 37 | attributes) |
| 38 | (remove-if-not |
| 39 | (lambda (attribute) |
| 40 | (and (attribute-active-p attribute) |
| 41 | (some #'layer-active-p |
| 42 | (mapcar #'find-layer |
| 43 | (slot-definition-layers |
| 44 | (attribute-effective-attribute-definition attribute)))))) |
| 45 | (description-attributes description)))))) |
| 46 | |
| 47 | |
| 48 | |
| 49 | |
| 50 | |
| 51 | |
| 52 | ;;; A handy macro. |
| 53 | (defmacro define-description (name &optional superdescriptions &body options) |
| 54 | (let ((description-name (defining-description name))) |
| 55 | (destructuring-bind (&optional slots &rest options) options |
| 56 | (let ((description-layers (cdr (assoc :in-description options)))) |
| 57 | (if description-layers |
| 58 | `(progn ;eval-when (:compile-toplevel :load-toplevel :execute) |
| 59 | ,@(loop |
| 60 | :for layer |
| 61 | :in description-layers |
| 62 | :collect `(define-description |
| 63 | ,name ,superdescriptions ,slots |
| 64 | ,@(acons |
| 65 | :in-layer (defining-description layer) |
| 66 | (remove :in-description options :key #'car))))) |
| 67 | `(progn ;eval-when (:compile-toplevel :load-toplevel :execute) |
| 68 | ; `(progn |
| 69 | (defclass ,description-name |
| 70 | ,(append (mapcar #'defining-description |
| 71 | superdescriptions) |
| 72 | (unless (or (eq t name) |
| 73 | (assoc :mixinp options)) |
| 74 | (list (defining-description t)))) |
| 75 | ,(if slots slots '()) |
| 76 | ,@options |
| 77 | ,@(unless (assoc :metaclass options) |
| 78 | '((:metaclass standard-description-class)))) |
| 79 | (initialize-descriptions) |
| 80 | (find-description ',name))))))) |
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