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[bpt/guile.git] / module / system / base / language.scm

;;; Multi-language support

;; Copyright (C) 2001 Free Software Foundation, Inc.

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; 
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;; 
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Code:

(define-module (system base language)
  :use-syntax (system base syntax)
  :export (define-language lookup-language make-language
           language-name language-title language-version language-reader
           language-printer language-read-file language-expander
           language-translator language-evaluator language-environment))

\f
;;;
;;; Language class
;;;

(define-record (<language> name title version reader printer read-file
			   (expander (lambda (x e) x))
			   (translator (lambda (x e) x))
			   (evaluator #f)
			   (environment #f)
			   ))

(define-macro (define-language name . spec)
  `(define ,name (make-language :name ',name ,@spec)))

(define (lookup-language name)
  (let ((m (resolve-module `(language ,name spec))))
    (if (module-bound? m name)
	(module-ref m name)
	(error "no such language" name))))