scsh-0.5/scsh/enumconst.scm

;;; Copyright (c) 1994 by Olin Shivers.

;;; Handy for defining random flags and constants.
;;; (define-enum-constant "errno" intr 9) => (define errno/intr 9)
;;; Ugly, but it works.

;;; The question: is / the best separator? Alternates: $ . |


;;; (define-enum-constant fruit apple 1) =>
;;; (define fruit/apple 1)

(define-syntax define-enum-constant
  (lambda (form rename compare)
    (let ((%define (rename 'define))
	  (var (string->symbol (string-append (symbol->string (cadr  form)) "/"
					      (symbol->string (caddr form)))))
	  (value (cadddr form)))
      `(,%define ,var ,value))))

;;; (define-enum-constants fruit (apple 1) (orange 2))
;;; => (begin (define-enum-constant fruit apple  1)
;;;           (define-enum-constant fruit orange 2))

(define-syntax define-enum-constants
  (syntax-rules ()
    ((define-enum-constants set (elt val) ...)
     (begin (define-enum-constant set elt val) ...))))