53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
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;;;;
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;;;; c o m p o s i t e - s l o t . s t k l o s -- Composite slots metaclass
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;;;;
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;;;; Copyright <20> 1996-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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;;;;
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;;;; Permission to use, copy, and/or distribute this software and its
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;;;; documentation for any purpose and without fee is hereby granted, provided
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;;;; that both the above copyright notice and this permission notice appear in
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;;;; all copies and derived works. Fees for distribution or use of this
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;;;; software or derived works may only be charged with express written
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;;;; permission of the copyright holder.
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;;;; This software is provided ``as is'' without express or implied warranty.
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;;;;
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;;;; $Id: composite-slot.stklos 1.1 Tue, 03 Feb 1998 11:13:08 +0100 eg $
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;;;;
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;;;; Author: Erick Gallesio [eg@unice.fr]
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;;;; Creation date: 17-Oct-1996 18:16
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;;;; Last file update: 3-Feb-1998 09:48
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(select-module STklos)
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(define-class <Composite-metaclass> (<class>)
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())
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(define-method compute-get-n-set ((class <Composite-metaclass>) slot)
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(if (memv (slot-definition-allocation slot) '(:propagated :special))
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(compute-propagated-get-n-set slot (class-environment class))
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(next-method)))
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(define (compute-propagated-get-n-set s env)
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(let ((prop (or (get-keyword :propagate-to (cdr s) #f)
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(get-keyword :propagate (cdr s) #f)))
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(s-name (slot-definition-name s))
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(build-reader (lambda (s default)
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(unless (pair? s) (set! s (list s default)))
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`(slot-ref (slot-ref o ',(car s)) ',(cadr s))))
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(build-writer (lambda (s default)
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(unless (pair? s) (set! s (list s default)))
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`(slot-set! (slot-ref o ',(car s)) ',(cadr s) v))))
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(unless prop (error "Propagation not specified for slot ~s" s-name))
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(unless (pair? prop) (error "Bad propagation list for slot ~s" s-name))
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(list
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;; The getter
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(make-closure `(lambda (o)
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,(build-reader (car prop) s-name))
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env)
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;; The setter
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(make-closure `(lambda (o v)
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,@(map (lambda (item) (build-writer item s-name)) prop))
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env))))
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