55 lines
1.5 KiB
Scheme
55 lines
1.5 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016,2018 Jan (janneke) 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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;;; Minimal implementation of srfi-14, for nyacc.
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;;; Code:
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;; FIXME: have structs
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(define (char-set . x)
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(cons '*char-set* x))
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(define (char-set? x)
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(and (pair? x) (eq? (car x) '*char-set*)))
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(define (char-set= a b)
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(and (char-set? a) (char-set? b)
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(equal? a b)))
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(define char-set:whitespace (char-set #\tab #\page #\return #\vtab #\newline #\space))
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(define (list->char-set lst)
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(apply char-set lst))
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(define (string->char-set x . base)
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(apply char-set (append (string->list x) (if (null? base) '() (cdar base)))))
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(define (string->char-set! x base)
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(set-cdr! (last-pair base) (string->list x))
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base)
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(define (char-set-contains? cs x)
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(and (memq x cs) #t))
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(define (char-whitespace? c)
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(char-set-contains? char-set:whitespace c))
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