53 lines
1.8 KiB
Scheme
53 lines
1.8 KiB
Scheme
;;; GNU Mes --- Maxwell Equations of Software
|
|
;;; Copyright (C) 2002, 2006 Free Software Foundation, Inc.
|
|
;;;
|
|
;;; This file is part of GNU Mes.
|
|
;;;
|
|
;;; GNU 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.
|
|
;;;
|
|
;;; GNU 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; srfi-26.scm --- specializing parameters without currying.
|
|
;;; From Guile-1.8
|
|
|
|
(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)))))
|