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;;; Guile Emac Lisp
;; 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 (language elisp runtime)
#:export (void nil-value t-value elisp-bool runtime-error macro-error)
#:export-syntax (built-in-func built-in-macro prim))
; This module provides runtime support for the Elisp front-end.
; The reserved value to mean (when eq?) void.
(define void (list 42))
; Values for t and nil.
; FIXME: Use real nil.
(define nil-value #f)
(define t-value #t)
; Report an error during macro compilation, that means some special compilation
; (syntax) error; or report a simple runtime-error from a built-in function.
(define (macro-error msg . args)
(apply error msg args))
(define runtime-error macro-error)
; Convert a scheme boolean to Elisp.
(define (elisp-bool b)
(if b
t-value
nil-value))
; Define a predefined function or predefined macro for use in the function-slot
; and macro-slot modules, respectively.
(define-syntax built-in-func
(syntax-rules ()
((_ name value)
(begin
(define-public name (make-fluid))
(fluid-set! name value)))))
(define-syntax built-in-macro
(syntax-rules ()
((_ name value)
(define-public name value))))
; Call a guile-primitive that may be rebound for elisp and thus needs absolute
; addressing.
(define-syntax prim
(syntax-rules ()
((_ sym args ...)
((@ (guile) sym) args ...))))
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