> On May 28, 2019, at 7:11 AM, Jonathan Simpson <jjsim...@gmail.com> wrote:
>
> Both the function definition and function calls are created by similar
> looking macros which pass strings as the function name. I've now taken steps
> to break hygiene in the defining macro, but the calling macro just converts
> the string to a symbol. It's invocation looks something like this:
>
> (query
> (line (offset 0) (type "use") "tga-image"))
>
> Perhaps they aren't referring to the same binding. Maybe I need a
> datum->syntax in this macro as well. I don't have access to the code at the
> moment, so I can't try it, but does this make sense?
>
> If this is the case then I can probably fix it by modifying the other macro
> as well, but modifying the lexer to emit symbols instead of strings seems
> like the best approach.
Here's an example of two macros that both make an identifier out of
"tga-image": the first defines a function called `tga-image`, and the second
calls it. Notice that the same syntax-context-switching fandango is needed in
both cases to ensure that both `tga-image` ids are placed inside the same
syntax context, so that the first one binds the second. (As someone pointed out
earlier, you could also use `format-id` for this, which is shorthand for the
same operation)
#lang racket
(define-syntax (definer-macro stx)
(syntax-case stx ()
[(_ magic-name)
(with-syntax ([name (datum->syntax #'magic-name (string->symbol
(syntax->datum #'magic-name)))])
#'(define (name x) x))]))
(definer-macro "tga-image")
(define-syntax (caller-macro stx)
(syntax-case stx ()
[(_ magic-name arg)
(with-syntax ([name (datum->syntax #'magic-name (string->symbol
(syntax->datum #'magic-name)))])
#'(name arg))]))
(caller-macro "tga-image" 42)
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