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;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: kmrcl-*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: attrib-class.lisp
;;;; Purpose: Defines metaclass allowing use of attributes on slots
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
;;;; $Id: attrib-class.lisp 9058 2004-04-18 17:18:57Z kevin $
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002-2003 by Kevin M. Rosenberg
;;;;
;;;; KMRCL users are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser GNU Public License
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
;; Disable attrib class until understand changes in sbcl/cmucl
;; using COMPUTE-SLOT-ACCESSOR-INFO and defining method
;; for slot access of ALL-ATTRIBUTES. Does this work on Allegro/LW?
;;;; Defines a metaclass that allows the use of attributes (or subslots)
;;;; on slots. Based on example in AMOP, but modified to use ACL's MOP.
(in-package #:kmrcl)
(defclass attributes-class (kmr-mop:standard-class)
()
(:documentation "metaclass that implements attributes on slots. Based
on example from AMOP"))
(defclass attributes-dsd (kmr-mop:standard-direct-slot-definition)
((attributes :initarg :attributes :initform nil
:accessor dsd-attributes)))
(defclass attributes-esd (kmr-mop:standard-effective-slot-definition)
((attributes :initarg :attributes :initform nil
:accessor esd-attributes)))
;; encapsulating macro for Lispworks
(kmr-mop:process-slot-option attributes-class :attributes)
#+(or cmu scl sbcl openmcl)
(defmethod kmr-mop:validate-superclass ((class attributes-class)
(superclass kmr-mop:standard-class))
t)
(defmethod kmr-mop:direct-slot-definition-class ((cl attributes-class) #+kmr-normal-dsdc &rest initargs)
(declare (ignore initargs))
(kmr-mop:find-class 'attributes-dsd))
(defmethod kmr-mop:effective-slot-definition-class ((cl attributes-class) #+kmr-normal-dsdc &rest initargs)
(declare (ignore initargs))
(kmr-mop:find-class 'attributes-esd))
(defmethod kmr-mop:compute-effective-slot-definition
((cl attributes-class) #+kmr-normal-cesd name dsds)
#+kmr-normal-cesd (declare (ignore name))
(let ((esd (call-next-method)))
(setf (esd-attributes esd) (remove-duplicates (mapappend #'dsd-attributes dsds)))
esd))
;; This does not work in Lispworks prior to version 4.3
(defmethod kmr-mop:compute-slots ((class attributes-class))
(let* ((normal-slots (call-next-method))
(alist (mapcar
#'(lambda (slot)
(cons (kmr-mop:slot-definition-name slot)
(mapcar #'(lambda (attr) (list attr))
(esd-attributes slot))))
normal-slots)))
(cons (make-instance
'attributes-esd
:name 'all-attributes
:initform `',alist
:initfunction #'(lambda () alist)
:allocation :instance
:documentation "Attribute bucket"
:type t
)
normal-slots)))
(defun slot-attribute (instance slot-name attribute)
(cdr (slot-attribute-bucket instance slot-name attribute)))
(defun (setf slot-attribute) (new-value instance slot-name attribute)
(setf (cdr (slot-attribute-bucket instance slot-name attribute))
new-value))
(defun slot-attribute-bucket (instance slot-name attribute)
(let* ((all-buckets (slot-value instance 'all-attributes))
(slot-bucket (assoc slot-name all-buckets)))
(unless slot-bucket
(error "The slot named ~S of ~S has no attributes."
slot-name instance))
(let ((attr-bucket (assoc attribute (cdr slot-bucket))))
(unless attr-bucket
(error "The slot named ~S of ~S has no attributes named ~S."
slot-name instance attribute))
attr-bucket)))
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