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;;; installed-scm-file
;;;; Copyright (C) 2003, 2006, 2011, 2014, 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 library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
(define-module (ice-9 weak-vector)
#:use-module (ice-9 ephemerons)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:export (make-weak-vector
list->weak-vector
weak-vector
weak-vector?
weak-vector-ref
weak-vector-set!))
(define (immediate? x)
(cond
((exact-integer? x) (<= most-negative-fixnum x most-positive-fixnum))
((char? x) #t)
((eq? x #f) #t)
((eq? x #nil) #t)
((eq? x '()) #t)
((eq? x #t) #t)
((unspecified? x) #t)
((eof-object? x) #t)
(else #f)))
(define-record-type <weak-vector>
(%make-weak-vector weaks)
weak-vector?
(weaks weak-vector-weaks))
(define* (make-weak-vector size #:optional (fill #f))
(let ((wv (%make-weak-vector (make-vector size #f))))
(let lp ((i 0))
(when (< i size)
(weak-vector-set! wv i fill)
(lp (1+ i))))
wv))
(define (make-weak val)
(if (immediate? val)
val
(make-ephemeron val #t)))
(define (weak-vector-set! wv idx val)
(vector-set! (weak-vector-weaks wv) idx (make-weak val))
(values))
(define (weak-vector-ref wv idx)
(let ((weak (vector-ref (weak-vector-weaks wv) idx)))
(if (ephemeron? weak)
(ephemeron-key weak)
weak)))
(define (list->weak-vector ls)
(let ((wv (make-weak-vector (length ls) #f)))
(let lp ((ls ls) (idx 0))
(match ls
(() wv)
((elt . ls)
(weak-vector-set! wv idx elt)
(lp ls (1+ idx)))))))
(define (weak-vector . elts)
(list->weak-vector elts))
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