module/system/base/language.scm

   1 ;;; Multi-language support
   2
   3 ;; Copyright (C) 2001 Free Software Foundation, Inc.
   4
   5 ;; This program is free software; you can redistribute it and/or modify
   6 ;; it under the terms of the GNU General Public License as published by
   7 ;; the Free Software Foundation; either version 2, or (at your option)
   8 ;; any later version.
   9 ;;
  10 ;; This program is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;; GNU General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the GNU General Public License
  16 ;; along with this program; see the file COPYING.  If not, write to
  17 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 ;; Boston, MA 02111-1307, USA.
  19
  20 ;;; Code:
  21
  22 (define-module (system base language)
  23   :use-syntax (system base syntax)
  24   :export (define-language lookup-language make-language
  25            language-name language-title language-version language-reader
  26            language-printer language-read-file language-expander
  27            language-translator language-evaluator language-environment))
  28
  29 \f
  30 ;;;
  31 ;;; Language class
  32 ;;;
  33
  34 (define-record (<language> name title version reader printer read-file
  35                            (expander (lambda (x e) x))
  36                            (translator (lambda (x e) x))
  37                            (evaluator #f)
  38                            (environment #f)
  39                            ))
  40
  41 (define-macro (define-language name . spec)
  42   `(define ,name (make-language :name ',name ,@spec)))
  43
  44 (define (lookup-language name)
  45   (let ((m (resolve-module `(language ,name spec))))
  46     (if (module-bound? m name)
  47         (module-ref m name)
  48         (error "no such language" name))))