| 1 | (in-package :lisp-on-lines) |
| 2 | |
| 3 | (defdynamic described-object nil) |
| 4 | (defdynamic description nil) |
| 5 | |
| 6 | ;;backwards-compat hacks |
| 7 | (define-symbol-macro *object* (dynamic described-object)) |
| 8 | (define-symbol-macro *description* (dynamic description)) |
| 9 | |
| 10 | ;; forward compat hacks |
| 11 | |
| 12 | (defun current-description () |
| 13 | (dynamic description)) |
| 14 | |
| 15 | (define-layered-function description-of (thing) |
| 16 | (:method (thing) |
| 17 | (find-description 't))) |
| 18 | |
| 19 | (defun description-print-name (description) |
| 20 | (description-class-name (class-of description))) |
| 21 | |
| 22 | (defun description-attributes (description) |
| 23 | (alexandria:hash-table-values (description-class-attributes (class-of description)))) |
| 24 | |
| 25 | (defun description-current-attributes (description) |
| 26 | (remove-if-not |
| 27 | (lambda (attribute) |
| 28 | (and |
| 29 | (some #'layer-active-p |
| 30 | (mapcar #'find-layer |
| 31 | (slot-definition-layers |
| 32 | (attribute-effective-attribute-definition attribute)))))) |
| 33 | (description-attributes description))) |
| 34 | |
| 35 | (defun description-active-attributes (description) |
| 36 | (remove-if-not |
| 37 | #'attribute-active-p |
| 38 | (description-attributes description))) |
| 39 | |
| 40 | |
| 41 | |
| 42 | (define-layered-function description-active-descriptions (description) |
| 43 | (:method ((description t)) |
| 44 | (attribute-value (find-attribute description 'active-descriptions))) |
| 45 | (:method ((description attribute)) |
| 46 | (attribute-active-descriptions description))) |
| 47 | |
| 48 | (define-layered-function description-inactive-descriptions (description) |
| 49 | (:method ((description t)) |
| 50 | (attribute-value (find-attribute description 'inactive-descriptions))) |
| 51 | (:method ((description attribute)) |
| 52 | (attribute-inactive-descriptions description))) |
| 53 | |
| 54 | (define-layered-function attributes (description) |
| 55 | (:method (description) |
| 56 | (let* ((active-attributes |
| 57 | (find-attribute description 'active-attributes)) |
| 58 | (attributes (when active-attributes |
| 59 | (ignore-errors (attribute-value active-attributes))))) |
| 60 | (remove-if-not |
| 61 | (lambda (attribute) |
| 62 | (and attribute |
| 63 | (attribute-active-p attribute) |
| 64 | (some #'layer-active-p |
| 65 | (attribute-layers attribute)))) |
| 66 | (if attributes |
| 67 | (mapcar (lambda (spec) |
| 68 | (find-attribute |
| 69 | description |
| 70 | (if (listp spec) |
| 71 | (car spec) |
| 72 | spec))) |
| 73 | attributes) |
| 74 | (description-attributes description)))))) |
| 75 | |
| 76 | (defun funcall-with-described-object (function object description &rest args) |
| 77 | (setf description (or description (description-of object))) |
| 78 | (dynamic-let ((description description) |
| 79 | (object object)) |
| 80 | (dletf (((described-object description) object)) |
| 81 | (funcall-with-layer-context |
| 82 | (modify-layer-context (adjoin-layer description (current-layer-context)) |
| 83 | :activate (description-active-descriptions description) |
| 84 | :deactivate (description-inactive-descriptions description)) |
| 85 | (lambda () |
| 86 | (with-special-symbol-access |
| 87 | (contextl::funcall-with-special-initargs |
| 88 | (without-special-symbol-access |
| 89 | (loop |
| 90 | :for (key val) :on args :by #'cddr |
| 91 | :collect (list (find key (description-attributes description) |
| 92 | :key #'attribute-keyword) |
| 93 | :value val))) |
| 94 | (lambda () |
| 95 | (contextl::funcall-with-special-initargs |
| 96 | (without-special-symbol-access |
| 97 | (let ((attribute (ignore-errors (find-attribute description 'active-attributes)))) |
| 98 | (when attribute |
| 99 | (loop for spec in (attribute-value attribute) |
| 100 | if (listp spec) |
| 101 | collect (cons (or |
| 102 | (find-attribute description (car spec)) |
| 103 | (error "No attribute matching ~A" (car spec))) |
| 104 | (cdr spec)))))) |
| 105 | (lambda () |
| 106 | (without-special-symbol-access |
| 107 | (funcall function)))))))))))) |
| 108 | |
| 109 | (defmacro with-described-object ((object &optional description) |
| 110 | &body body) |
| 111 | (once-only (object) |
| 112 | `(funcall-with-described-object (lambda (),@body) ,object ,(or description |
| 113 | `(description-of ,object))))) |
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