mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-06-04 03:00:20 +02:00
3a9c0939a0
This will allow for weak tables to be implemented partly in Scheme. * module/ice-9/object-properties.scm: New file. * am/bootstrap.am (SOURCES): Add new file. * module/ice-9/boot-9.scm: * module/ice-9/deprecated.scm (make-object-property*): Deprecate make-object-property in default env and add a shim. * module/ice-9/buffered-input.scm (ice-9): * module/language/elisp/boot.el (plist-function): * module/scripts/frisk.scm (scripts): * module/web/http.scm (web): Adapt users to import the new module.
43 lines
1.8 KiB
Scheme
43 lines
1.8 KiB
Scheme
;;; Copyright (C) 2025 Free Software Foundation, Inc.
|
||
;;;
|
||
;;; This library is free software: you can redistribute it and/or modify
|
||
;;; it under the terms of the GNU Lesser General Public License as
|
||
;;; published by the Free Software Foundation, either version 3 of the
|
||
;;; License, or (at your option) any later version.
|
||
;;;
|
||
;;; This library is distributed in the hope that it will be useful, but
|
||
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
;;; Lesser General Public License for more details.
|
||
;;;
|
||
;;; You should have received a copy of the GNU Lesser General Public
|
||
;;; License along with this program. If not, see
|
||
;;; <http://www.gnu.org/licenses/>.
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Properties are a lispy way to associate random info with random
|
||
;;; objects. Traditionally properties are implemented as an alist or a
|
||
;;; plist actually pertaining to the object in question.
|
||
;;;
|
||
;;; These "object properties" have the advantage that they can be
|
||
;;; associated with any object, even if the object has no plist. Object
|
||
;;; properties are good when you are extending pre-existing objects in
|
||
;;; unexpected ways. They also present a pleasing, uniform
|
||
;;; procedure-with-setter interface. But if you have a data type that
|
||
;;; always has properties, it's often still best to store those
|
||
;;; properties within the object itself.
|
||
;;;
|
||
;;; Code:
|
||
|
||
|
||
(define-module (ice-9 object-properties)
|
||
;; FIXME: Change to #:export when deprecated bindings removed.
|
||
#:replace (make-object-property))
|
||
|
||
(define (make-object-property)
|
||
;; Weak tables are thread-safe.
|
||
(let ((prop (make-weak-key-hash-table)))
|
||
(make-procedure-with-setter
|
||
(lambda (obj) (hashq-ref prop obj))
|
||
(lambda (obj val) (hashq-set! prop obj val)))))
|