Re: 2 macros in one expression

[Matt Wette <matt.wette@gmail.com>]

Did you try using the following?

(define-syntax $nfx$
   (syntax-rules (<-)
     ((...


On 4/14/23 4:02 AM, Damien Mattei wrote:
> hello,
>
> i have 2 macros used in one expression like this:
> scheme@(guile-user)> (define i 2)
> scheme@(guile-user)> {i <- i + 1}
> and i got this error:
> While compiling expression:
> Syntax error:
> unknown location: source expression failed to match any pattern in form <-
>
> i use SRFI-105 so :
>   '{i <- i + 1} expand in:
> ($nfx$ i <- i + 1)
>
> and i'm expecting $nfx$ to be called but none of this happens:
> scheme@(guile-user)> ($nfx$ i <- i + 1)
> While compiling expression:
> Syntax error:
> unknown location: source expression failed to match any pattern in form <-
>
> it seems to be the <- macro and i do not understand why?
>
> any idea?
>
> macros are defined like this for the beginning:
> ;; from file assignment.scm
> (define-syntax <-
>
>    (syntax-rules ()
>      ;;  special form like : (<- ($bracket-apply$ T 3) ($bracket-apply$ T 4))
>
>      ;; one dimension array, example: {a[4] <- 7}
>      ;; $bracket-apply$ is from SRFI 105  bracket-apply is an argument of
> the macro
>      ((_ (bracket-apply container index) expr)
>
> ....
>
> ;; from file scheme-infix.scm
> (define-syntax $nfx$
>    (syntax-rules ()
>
>      ((_ ident opspecial term1 op term2) (cond ((or (equal? (quote
> opspecial) (quote <-)) (equal? (quote opspecial) (quote ←)))
>        (begin
> (display "$nfx$") (newline)
> (opspecial ident (op term1 term2)))) ;; {ident <- {term1 op term2}}
>
> ...
>
>
> it is in a module like this:
>
> (define-module (Scheme+)
>
>    #:use-module (growable-vector)
>    #:use-module (srfi srfi-69) ;; Basic hash tables
>    #:use-module (srfi srfi-31) ;; rec
>    #:export ($nfx$ def $bracket-apply$ <- ← -> → <+ ⥆ +> ⥅ declare $ & condx
> <> ≠ ** <v v> ⇜ ⇝ repeat)
>    #:replace (do when unless))
>
>
>
> (include-from-path "def.scm")
> (include-from-path "array.scm")
> (include-from-path "set-values-plus.scm")
> (include-from-path "apply-square-brackets.scm")
> (include-from-path "assignment.scm")
> (include-from-path "declare.scm")
> (include-from-path "condx.scm")
> (include-from-path "block.scm")
> (include-from-path "not-equal.scm")
> (include-from-path "exponential.scm")
> (include-from-path "while-do-when-unless.scm")
> (include-from-path "repeat-until.scm")
> (include-from-path "scheme-infix.scm")
>
> if it can help.
>
> Regards,
> Damien