73 lines
2.8 KiB
Scheme
73 lines
2.8 KiB
Scheme
;;; GNU Mes --- Maxwell Equations of Software
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;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of GNU Mes.
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;;;
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;;; GNU 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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;;; GNU 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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(define (pair? x) (eq? (core:type x) <cell:pair>))
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(define (not x) (if x #f #t))
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(define-macro (or . x)
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(if (null? x) #f
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(if (null? (cdr x)) (car x)
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(list (list (quote lambda) (list (quote r))
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(list (quote if) (quote r) (quote r)
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(cons (quote or) (cdr x))))
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(car x)))))
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(define (boolean? x)
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(or (eq? x #f) (eq? x #t)))
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(define (display x . rest)
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(if (null? rest) (core:display x)
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(core:display-port x (car rest))))
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(define (write x . rest)
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(if (null? rest) (core:write x)
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(core:write-port x (car rest))))
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(define (cadr x) (car (cdr x)))
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(define (cddr x) (cdr (cdr x)))
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;;(define (current-output-port) 1)
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(define (simple-format destination format . rest)
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((lambda (port lst)
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(define (simple-format lst args)
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(if (pair? lst)
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((lambda (c)
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(if (not (eq? c #\~)) (begin (write-char (car lst) port)
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(simple-format (cdr lst) args))
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((lambda (c)
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(if (or (eq? c #\A)
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(eq? c #\a))
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(display (car args) port)
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(if (or (eq? c #\S)
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(eq? c #\s))
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(write (car args) port)
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(write (car args) port)))
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(simple-format (cddr lst) (cdr args)))
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(cadr lst))))
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(car lst))))
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(if destination (simple-format lst rest)
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(with-output-to-string
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(lambda () (simple-format lst rest)))))
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(if (boolean? destination) (current-output-port) destination)
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;;(string->list format)
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format))
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;;(simple-format 2 "~A:~A: parse failed at state ~A, on input ~S\n" "<stdin>" 1 59 "(")
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(simple-format #t '(#\~ #\A #\: #\~ #\A #\: #\space #\p #\a #\r #\s #\e #\space #\f #\a #\i #\l #\e #\d #\space #\a #\t #\space #\s #\t #\a #\t #\e #\space #\~ #\A #\, #\space #\o #\n #\space #\i #\n #\p #\u #\t #\space #\~ #\S #\newline) "<stdin>" 1 59 "(")
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