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7c49985fac
* module/system/foreign-object.scm (getter-method): Fix for removal of getters-n-setters property.
88 lines
3.2 KiB
Scheme
88 lines
3.2 KiB
Scheme
;;; Wrapping foreign objects in Scheme
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;;; Copyright (C) 2014, 2015 Free Software Foundation, Inc.
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;;;
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;;; This library is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public
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;;; License as published by the Free Software Foundation; either
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;;; version 3 of the License, or (at your option) any later version.
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;;;
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;;; This library is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Lesser General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public
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;;; License along with this library; if not, write to the Free Software
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;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;
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;;; Commentary:
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;;
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;;
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;;; Code:
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(define-module (system foreign-object)
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#:use-module (oop goops)
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#:export (make-foreign-object-type
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define-foreign-object-type))
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(eval-when (eval load expand)
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(load-extension (string-append "libguile-" (effective-version))
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"scm_init_foreign_object"))
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(define-class <finalizer-class> (<class>)
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(finalizer #:init-keyword #:finalizer #:init-value #f
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#:getter finalizer))
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(define-method (allocate-instance (class <finalizer-class>) initargs)
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(let ((instance (next-method))
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(finalizer (finalizer class)))
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(when finalizer
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(%add-finalizer! instance finalizer))
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instance))
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(define (getter-method class slot-name existing)
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(let ((getter (ensure-generic existing slot-name))
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(slot-def (or (class-slot-definition class slot-name)
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(slot-missing class slot-name))))
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(add-method! getter (compute-getter-method class slot-def))
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getter))
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(define* (make-foreign-object-type name slots #:key finalizer)
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(unless (symbol? name)
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(error "type name should be a symbol" name))
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(unless (or (not finalizer) (procedure? finalizer))
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(error "finalizer should be a procedure" finalizer))
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(let ((dslots (map (lambda (slot)
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(unless (symbol? slot)
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(error "slot name should be a symbol" slot))
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(list slot #:class <foreign-slot>
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#:init-keyword (symbol->keyword slot)
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#:init-value 0))
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slots)))
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(if finalizer
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(make-class '() dslots #:name name
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#:finalizer finalizer #:metaclass <finalizer-class>)
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(make-class '() dslots #:name name))))
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(define-syntax define-foreign-object-type
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(lambda (x)
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(define (kw-apply slots)
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(syntax-case slots ()
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(() #'())
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((slot . slots)
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(let ((kw (symbol->keyword (syntax->datum #'slot))))
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#`(#,kw slot . #,(kw-apply #'slots))))))
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(syntax-case x ()
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((_ name constructor (slot ...) kwarg ...)
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#`(begin
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(define name
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(make-foreign-object-type 'name '(slot ...) kwarg ...))
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(define slot
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(getter-method name 'slot (and (defined? 'slot) slot)))
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...
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(define constructor
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(lambda (slot ...)
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(make name #,@(kw-apply #'(slot ...))))))))))
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