56 lines
1.8 KiB
Scheme
56 lines
1.8 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License version 3 as
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;;; published by the Free Software Foundation.
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;;;
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;;; This program is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (ikarus apply)
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(export apply)
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(import
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(except (ikarus) apply)
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(ikarus system $pairs)
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(ikarus system $stack))
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(define apply
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(let ()
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(define (err f ls)
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(if (procedure? f)
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(die 'apply "not a list" ls)
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(die 'apply "not a procedure" f)))
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(define (fixandgo f a0 a1 ls p d)
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(cond
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[(null? ($cdr d))
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(let ([last ($car d)])
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($set-cdr! p last)
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(if (and (procedure? f) (list? last))
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($$apply f a0 a1 ls)
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(err f last)))]
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[else (fixandgo f a0 a1 ls d ($cdr d))]))
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(define apply
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(case-lambda
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[(f ls)
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(if (and (procedure? f) (list? ls))
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($$apply f ls)
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(err f ls))]
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[(f a0 ls)
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(if (and (procedure? f) (list? ls))
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($$apply f a0 ls)
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(err f ls))]
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[(f a0 a1 ls)
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(if (and (procedure? f) (list? ls))
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($$apply f a0 a1 ls)
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(err f ls))]
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[(f a0 a1 . ls)
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(fixandgo f a0 a1 ls ls ($cdr ls))]))
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apply)))
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