sorry i miss copy to mailing list... ---------- Forwarded message --------- From: Damien Mattei <damien.mat...@gmail.com> Date: Wed, Feb 2, 2022 at 12:09 PM Subject: Re: reserved-keyword in macro To: Maxime Devos <maximede...@telenet.be>
thanks maxim ,it works so my problem come from elsewhere scheme@(guile-user)> (define-syntax macro (syntax-rules (reserved-keyword) ((_ reserved-keyword arg) 'first) ... ((_ arg1 arg2) 'second))) scheme@(guile-user)> (macro 4 5) second scheme@(guile-user)> (macro reserved-keyword 5) first this was a simplified example my real case is this: (define-syntax <- (syntax-rules ($bracket-apply$) ;; special form like : (<- ($bracket-apply$ T 3) ($bracket-apply$ T 4)) ;; one dimension array, example: {a[4] <- 7} ;; $bracket-apply$ of SRFI 105 ((_ ($bracket-apply$ container index) expr) (let ((value expr)) ;; to avoid compute it twice ;; (if (equal? (quote $bracket-apply$) (quote funct-or-macro)) ;; test funct-or-macro equal $bracket-apply$ ;; normal case ;; {T[2] <- 4} ;; {T[3] <- T[2]} ;;(begin ;;(display "<- : vector or array set! or hash-table set!") (newline) (cond ((vector? container) (vector-set! container index value)) ((hash-table? container) (hash-table-set! container index value)) (else (array-set! container index value)));) ;; rare case (to prevent any error) ;; (let ((var (funct-or-macro container index))) ;; MUST be in a variable , otherwise: ;; While compiling expression: ;; Syntax error: ;; unknown location: quote: bad syntax in form quote ;; <- : variable set! after creation ;; (set! var value))) value)) ;; multi dimensions array : {a[2 4] <- 7} ;; $bracket-apply$ of SRFI 105 ((_ ($bracket-apply$ array index1 index2 ...) expr) (let ((value expr)) ;; to avoid compute it twice ;; (if (equal? (quote $bracket-apply$) (quote funct-or-macro)) ;; test funct-or-macro equal $bracket-apply$ ;; normal case ;;(begin ;;(display "<- : multidimensional vector or array set!") (newline) (if (vector? array) (array-n-dim-set! array value index1 index2 ...) (array-set! array index1 index2 ... value));) ;; rare case (to prevent any error) ;; (let ((var (funct-or-macro array index ...))) ;; MUST be in a variable ;; (display "<- : variable set! after creation (multidimensional)") (newline) ;; (set! var value))) value)) ;; not sure this case will be usefull ;; (define (foo) (values 1 2 3)) ;; (call-with-values foo list) ;;'(1 2 3) ;; (define (foo) (display "inside foo") (newline) (values 1 2 3)) ;; > (declare x y z) ;; > (<- (x y z) (foo)) ;; ((_ (funct-or-macro arg ...) expr) ;; (let ((var (funct-or-macro arg ...)) ;; (value expr)) ;; to avoid compute it twice ;; (set! var value) ;; var)) ((_ (var ...) expr) (begin (display expr) (newline) (let ((expr-list (call-with-values (lambda () expr) list))) (assign-var (var ...) expr-list) expr-list))) ;;(<- x 5) ((_ var expr) (begin ;;(display "<- : variable set!") (newline) (set! var expr) var)) ;; (declare x y z t) ;; {x <- y <- z <- t <- 7} ;; 7 ;; (list x y z t) ;; (7 7 7 7) ;; (declare I) ;; {I <- (make-array 0 4 4)} ;; #2((0 0 0 0) ;; (0 0 0 0) ;; (0 0 0 0) ;; (0 0 0 0)) ;; ;; {I[0 0] <- I[1 1] <- I[2 2] <- I[3 3] <- 1} ;; 1 ;; ;; I ;; #2((1 0 0 0) ;; (0 1 0 0) ;; (0 0 1 0) ;; (0 0 0 1)) ((_ var var1 var2 ...) ;; there is an expression in the last part of ellipsis! (<- var (<- var1 var2 ...))) )) ;; > (declare x y z) ;; > (assign-var (x y z) (1 2 3)) ;; > x ;; 1 ;; > y ;; 2 ;; > z ;; 3 (define-syntax assign-var (syntax-rules () ((_ (var ...) (exp ...)) (begin (set! var exp) ...)))) i'm cross developping in Guile and Racket and i'm sure Guile will do as Racket and here is the result: Bienvenue dans DrRacket, version 7.7 [3m]. Langage: reader "../SRFI/SRFI-105.rkt", avec débogage; limite mémoire : 128 MB. > (declare x y z) > (define (foo) (display "inside foo") (newline) (values 1 2 3)) > (<- (x y z) (foo)) inside foo . . ../../../../../../../../usr/share/racket/collects/racket/private/kw.rkt:1201:25: result arity mismatch; expected number of values not received expected: 1 received: 3 values...: > (define T (make-vector 5)) > {T[2] <- 1} 1 . ../required-files/assignment.rkt:140:7: assign-var: bad syntax in: (assign-var ($bracket-apply$ T 2) expr-list) > (<- T[2] 1) . ../required-files/assignment.rkt:140:7: assign-var: bad syntax in: (assign-var (2) expr-list) > (<- ($bracket-apply$ T 2) 1) 1 . ../required-files/assignment.rkt:140:7: assign-var: bad syntax in: (assign-var ($bracket-apply$ T 2) expr-list) > the problem is that anyway i do it when using reserved keyword in define-syntax the macro use the third case: (_ (var ...) expr) even when i have : (syntax-rules ($bracket-apply$) ;; special form like : (<- ($bracket-apply$ T 3) ($bracket-apply$ T 4)) ;; one dimension array, example: {a[4] <- 7} ;; $bracket-apply$ of SRFI 105 ((_ ($bracket-apply$ container index) expr) with (<- ($bracket-apply$ T 2) 1) entered at toplevel i should not be in the third case but the first of the macro <- that is strange... i think i could not get help from mailing list on a so complex example that rely on my Scheme+ development for multiple values return (aka let-values replacment with <- ), sorry for the inconvenience Damien On Wed, Feb 2, 2022 at 11:33 AM Maxime Devos <maximede...@telenet.be> wrote: > Damien Mattei schreef op wo 02-02-2022 om 11:13 [+0100]: > > (define-syntax macro > > (syntax-rules () > > ((_ arg1 arg2) code1) > > ((_ reserved-keyword arg) code2))) > > The rules are matched in-order, so when the first rule matches, the > second rule is ignored. I suggest: > > (define-syntax macro > (syntax-rules (reserved-keyword) > ((_ reserved-keyword arg) code2) > ((_ arg1 arg2) code1))) > > Greetings, > Maxime > >