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Import srfi-26 from Guile.

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* module/srfi/srfi-26.scm: Import.
* module/srfi/srfi-26.mes: Include it.
* AUTHORS: Mention it.
This commit is contained in:
Jan Nieuwenhuizen 2016-12-24 08:34:19 +01:00
parent 73fc7707a5
commit d295ee5668
3 changed files with 80 additions and 0 deletions
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@ -35,5 +35,8 @@ module/mes/pmatch.scm
Srfi-1 bits from Guile
module/srfi/srfi-1.scm
Srfi-26 from Guile
module/srfi/srfi-26.scm
Sxml bits from Guile
module/sxml/xpath.scm

28
module/srfi/srfi-26.mes Normal file
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@ -0,0 +1,28 @@
;;; -*-scheme-*-
;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
;;; Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; srfi-26.mes - cut, cute
(mes-use-module (mes scm))
(mes-use-module (mes guile))
(mes-use-module (srfi srfi-1))
(include-from-path "srfi/srfi-26.scm")

49
module/srfi/srfi-26.scm Normal file
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@ -0,0 +1,49 @@
;;; srfi-26.scm --- specializing parameters without currying.
;; Copyright (C) 2002, 2006 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 2.1 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 (srfi srfi-26)
:export (cut cute))
(cond-expand-provide (current-module) '(srfi-26))
(define-macro (cut slot . slots)
(let loop ((slots (cons slot slots))
(params '())
(args '()))
(if (null? slots)
`(lambda ,(reverse! params) ,(reverse! args))
(let ((s (car slots))
(rest (cdr slots)))
(case s
((<>)
(let ((var (gensym)))
(loop rest (cons var params) (cons var args))))
((<...>)
(if (pair? rest)
(error "<...> not on the end of cut expression"))
(let ((var (gensym)))
`(lambda ,(append! (reverse! params) var)
(apply ,@(reverse! (cons var args))))))
(else
(loop rest params (cons s args))))))))
(define-macro (cute . slots)
(let ((temp (map (lambda (s) (and (not (memq s '(<> <...>))) (gensym)))
slots)))
`(let ,(delq! #f (map (lambda (t s) (and t (list t s))) temp slots))
(cut ,@(map (lambda (t s) (or t s)) temp slots)))))