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;;; 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 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 (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)))))
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