101 lines
4 KiB
Scheme
101 lines
4 KiB
Scheme
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;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright (c) 1993-2004 by Richard Kelsey and Jonathan Rees.
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of Mes.
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;;;
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;;; Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Mes 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
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;;; GNU 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; srfi-9.mes - records. Assumes record-0.mes and record.mes are
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;;; available. Modified from
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;;; scheme48-1.1/scheme/alt/jar-defrecord.scm to implement SRFI-9.
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;;; Code:
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;;; Copyright (c) 1993-2004 by Richard Kelsey and Jonathan Rees. See file COPYING.
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;;; scheme48-1.1/COPYING
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;; Copyright (c) 1993-2004 Richard Kelsey and Jonathan Rees
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;; All rights reserved.
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;; Redistribution and use in source and binary forms, with or without
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;; modification, are permitted provided that the following conditions
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;; are met:
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;; 1. Redistributions of source code must retain the above copyright
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;; notice, this list of conditions and the following disclaimer.
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;; 2. Redistributions in binary form must reproduce the above copyright
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;; notice, this list of conditions and the following disclaimer in the
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;; documentation and/or other materials provided with the distribution.
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;; 3. The name of the authors may not be used to endorse or promote products
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;; derived from this software without specific prior written permission.
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;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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;; IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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; This is JAR's define-record-type, which doesn't resemble Richard's.
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; There's no implicit name concatenation, so it can be defined
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; entirely using syntax-rules. Example:
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; (define-record-type foo :foo
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; (make-foo x y)
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; foo? - predicate name is optional
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; (x foo-x)
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; (y foo-y)
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; (z foo-z set-foo-z!))
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(define-syntax define-record-type
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(syntax-rules ()
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((define-record-type type
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(constructor arg ...)
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(field . field-stuff)
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...)
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(begin (define type (make-record-type 'type '(field ...)))
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(define constructor (record-constructor type '(arg ...)))
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(define-accessors type (field . field-stuff) ...)))
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((define-record-type type
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(constructor arg ...)
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pred
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more ...)
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(begin (define-record-type type
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(constructor arg ...)
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more ...)
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(define pred (record-predicate type))))))
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;; Straightforward version
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(define-syntax define-accessors
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(syntax-rules ()
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((define-accessors type field-spec ...)
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(begin (define-accessor type . field-spec) ...))))
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(define-syntax define-accessor
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(syntax-rules ()
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((define-accessor type field accessor)
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(define accessor (record-accessor type 'field)))
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((define-accessor type field accessor modifier)
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(begin (define accessor (record-accessor type 'field))
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(define modifier (record-modifier type 'field))))))
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