mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-29 19:30:36 +02:00
edb6de0bec
* module/ice-9/boot-9.scm (%cond-expand-features): Remove redundant list of feature identifiers in the comment. Explain more clearly what belongs in this list. Remove srfi-6. * module/srfi/srfi-4.scm, module/srfi/srfi-27.scm, module/srfi/srfi-31.scm, module/srfi/srfi-38.scm, module/srfi/srfi-39.scm, module/srfi/srfi-42.scm, module/srfi/srfi-45.scm, module/srfi/srfi-67.scm: Add missing 'cond-expand-provide'. * module/srfi/srfi-69.scm: Fix erroneous 'cond-expand-provide'. * doc/ref/srfi-modules.texi (SRFI-0): Update the list of features in Guile core.
55 lines
2.1 KiB
Scheme
55 lines
2.1 KiB
Scheme
;;; srfi-39.scm --- Parameter objects
|
|
|
|
;; Copyright (C) 2004, 2005, 2006, 2008, 2011 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
|
|
|
|
;;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
|
|
;;; Date: 2004-05-05
|
|
|
|
;;; Commentary:
|
|
|
|
;; This is an implementation of SRFI-39 (Parameter objects).
|
|
;;
|
|
;; The implementation is based on Guile's fluid objects, and is, therefore,
|
|
;; thread-safe (parameters are thread-local).
|
|
;;
|
|
;; In addition to the forms defined in SRFI-39 (`make-parameter',
|
|
;; `parameterize'), a new procedure `with-parameters*' is provided.
|
|
;; This procedures is analogous to `with-fluids*' but taking as first
|
|
;; argument a list of parameter objects instead of a list of fluids.
|
|
;;
|
|
|
|
;;; Code:
|
|
|
|
(define-module (srfi srfi-39)
|
|
;; helper procedure not in srfi-39.
|
|
#:export (with-parameters*)
|
|
#:re-export (make-parameter
|
|
parameterize
|
|
current-input-port current-output-port current-error-port))
|
|
|
|
(cond-expand-provide (current-module) '(srfi-39))
|
|
|
|
(define (with-parameters* params values thunk)
|
|
(let more ((params params)
|
|
(values values)
|
|
(fluids '()) ;; fluids from each of PARAMS
|
|
(convs '())) ;; VALUES with conversion proc applied
|
|
(if (null? params)
|
|
(with-fluids* fluids convs thunk)
|
|
(more (cdr params) (cdr values)
|
|
(cons (parameter-fluid (car params)) fluids)
|
|
(cons ((parameter-converter (car params)) (car values)) convs)))))
|