scsh-0.5/scsh/enumconst.scm

29 lines
920 B
Scheme
Raw Normal View History

1995-10-13 23:34:21 -04:00
;;; 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)
1995-10-13 23:34:21 -04:00
(define-syntax define-enum-constant
(lambda (form rename compare)
(let ((%define (rename 'define))
(var (string->symbol (string-append (symbol->string (cadr form)) "/"
1995-10-13 23:34:21 -04:00
(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) ...))))