I'm working on a macro, |enum|, that accepts a prefix and a set of
values, that expand in to a basic symbolic enumeration:
(enum my foo bar)
=>
(define my '(foo bar))
(define my-foo 'foo)
(define my-bar 'bar)
The reason for the above is immaterial, I really need help with the
error I'm seeing trying to implement it. I am using a combination
of syntax-rules and er/ir macros, and I'm getting an error message
I don't understand (warning, untested code):
<++> file.scm
(define-syntax $%map
(syntax-rules ()
((_ fn () (r ...)) (r ...))
((_ fn (x y ...) (r ...)) ($%map fn (y ...) (r ... (fn x))))))
; (map foo x y z) => ((foo x) (foo y) (foo z))
;
(define-syntax %map
(syntax-rules ()
((_ fn l ...) ($%map fn (l ...) ()))))
(define-syntax enum
(ir-macro-transformer
(lambda (form inject compare?)
`(define-values (,(cadr form)
,@(map (lambda (x) (symbol-append ,(cadr form) '- x))
(cddr form)))
(values ,@(%map quote (cdr form)))))))
(enum my foo bar)
(pretty-print `(,my ,my-foo ,my-bar))
<-->
$ csi -n file.scm
Error: during expansion of (enum ...) - unbound variable: %map
Why is %map not visible inside enum?
-a
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