76 lines
2.4 KiB
Scheme
76 lines
2.4 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016,2017 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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;;; Code:
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(define-macro (define-module module . rest) #t)
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(define-macro (use-modules . rest) #t)
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(define (drain-input port)
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(list->string
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(let loop ((c (read-char)))
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(if (eq? c #\*eof*) '()
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(cons c (loop (read-char)))))))
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(define (make-string n . fill)
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(list->string (apply make-list n fill)))
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(define (object->string x . rest)
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(with-output-to-string
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(lambda () ((if (pair? rest) (car rest) write) x))))
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(define (port-filename p) "<stdin>")
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(define (port-line p) 0)
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(define (simple-format port format . rest) (map (lambda (x) (display x port)) rest))
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(define (with-input-from-string string thunk)
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(define save-peek-char peek-char)
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(define save-read-char read-char)
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(define save-unread-char unread-char)
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(let ((tell 0)
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(end (string-length string)))
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(set! peek-char
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(lambda () (if (= tell end) (integer->char -1)
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(string-ref string (- tell 1)))))
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(set! read-char
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(lambda () (if (= tell end) (integer->char -1)
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(begin
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(set! tell (1+ tell))
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(string-ref string (- tell 1))))))
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(set! unread-char
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(lambda (c) (set! tell (1- tell)) c)))
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(let ((r (thunk)))
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(set! peek-char save-peek-char)
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(set! read-char save-read-char)
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(set! unread-char save-unread-char)
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r))
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(define (with-input-from-file file thunk)
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(let ((port (open-input-file file)))
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(if (= port -1)
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(error 'no-such-file file)
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(let* ((save (current-input-port))
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(foo (set-current-input-port port))
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(r (thunk)))
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(set-current-input-port save)
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r))))
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