hax0rz..ugh + next name? test in macro.mes.
This commit is contained in:
Jan Nieuwenhuizen
parent
40bbb3dff1
commit
341d064a34
36
macro.mes
36
macro.mes
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@ -58,20 +58,28 @@
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)
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(d-s s-r
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(lambda (. n-a)
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(display "YEAH:")
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(display n-a)
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(newline)
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'(lambda (. i) ;;(i r c)
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(display "transformers")
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(newline)
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''tee-hee-hee
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)
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;; (define (foo) (display "Footje") (newline) 'f-f-f)
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;; foo
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;;"blaat"
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)
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;;(let ())
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(;; let () ;; syntax-rules uses (let () ...),
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;; mes doesn't support that yet; use ((lambda () ...))
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(lambda ()
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;; syntax-rules uses defines that get closured-in
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;; mes doesn't support that yet; move down
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;; (define name? symbol?)
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(lambda (. n-a)
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(define name? symbol?)
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(display "YEAH:")
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(display n-a)
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(display (name? n-a))
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(newline)
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'(lambda (. i) ;;(i r c)
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(display "transformers")
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(newline)
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''tee-hee-hee
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)
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;; (define (foo) (display "Footje") (newline) 'f-f-f)
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;; foo
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;;"blaat"
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)))
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)
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(display "calling s-r")
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20
mes.c
20
mes.c
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@ -291,6 +291,17 @@ apply_env_ (scm *fn, scm *x, scm *a)
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return begin_env (cddr (fn), pairlis (cadr (fn), x, a));
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else if (car (fn) == &scm_label)
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return apply_env (caddr (fn), x, cons (cons (cadr (fn), caddr (fn)), a));
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else if (car (fn)->type == PAIR) {
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#if DEBUG // FIXME: for macro.mes/syntax.mes this feels *wrong*
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printf ("APPLY WTF: fn=");
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display (fn);
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puts ("");
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#endif
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//return apply_env_ (eval_ (fn, a), x, a);
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scm *e = eval_ (fn, a);
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return apply_env_ (e, x, a);
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//return &scm_unspecified;
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}
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#if MACROS
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else if ((macro = assq (car (fn), cdr (assq (&scm_macro, a)))) != &scm_f) {
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#if DEBUG
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@ -302,13 +313,18 @@ apply_env_ (scm *fn, scm *x, scm *a)
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display (cdr (fn));
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puts ("");
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#endif
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scm *r = apply_env (cdr (macro), cdr (fn), a);
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//scm *r = apply_env (cdr (macro), cdr (fn), a);
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scm *r = apply_env (eval_ (cdr (macro), a), cdr (fn), a);
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#if DEBUG
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printf ("APPLY MACRO GOT: ==> ");
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display (r);
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puts ("");
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#endif
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return apply_env (r, x, a);
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//return apply_env (r, x, a);
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scm *e = eval_ (r, a);
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return apply_env (e, x, a);
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//return eval_ (cons (r, x), a);
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//return apply_env_ (eval (cdr (macro), a), x, a);
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//return eval (apply_env_ (cdr (macro), x, a), a);
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346
syntax.mes
346
syntax.mes
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@ -6,6 +6,8 @@
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;;(display thing)
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(newline))
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(define (member x lst)
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(display "MEMBER x=") (display x) (newline) (memq x lst))
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(display "mes:define-syntax...")
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;;(define (caddr x) (car (cdr (cdr x))))
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@ -81,191 +83,211 @@
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(newline)
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(mes:define-syntax syntax-rules
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(let ()
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;;begin
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(;; let () ;; syntax-rules uses (let () ...),
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;; mes doesn't support that yet; use ((lambda () ...))
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(lambda ()
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(define name? symbol?)
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;; syntax-rules uses defines that get closured-in
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;; mes doesn't support that yet; move down
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;; (define name? symbol?)
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(define (segment-pattern? pattern)
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(and (segment-template? pattern)
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(or (null? (cddr pattern))
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(syntax-error "segment matching not implemented" pattern))))
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(define (segment-template? pattern)
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(and (pair? pattern)
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(pair? (cdr pattern))
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(memq (cadr pattern) indicators-for-zero-or-more)))
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(define indicators-for-zero-or-more (list (string->symbol "...") '---))
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;; (define (segment-pattern? pattern)
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;; (and (segment-template? pattern)
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;; (or (null? (cddr pattern))
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;; (syntax-error "segment matching not implemented" pattern))))
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;; (define (segment-template? pattern)
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;; (and (pair? pattern)
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;; (pair? (cdr pattern))
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;; (memq (cadr pattern) indicators-for-zero-or-more)))
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;; (define indicators-for-zero-or-more (list (string->symbol "...") '---))
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(display "BOOO")
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(display "BOOO")
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(lambda (exp r c)
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(lambda (exp r c)
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(define %input (r '%input)) ;Gensym these, if you like.
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(define %compare (r '%compare))
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(define %rename (r '%rename))
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(define %tail (r '%tail))
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(define %temp (r '%temp))
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;; FIXME: mes, moved down
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(define name? symbol?)
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(define (segment-pattern? pattern)
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(and (segment-template? pattern)
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(or (null? (cddr pattern))
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(syntax-error "segment matching not implemented" pattern))))
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(define (segment-template? pattern)
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(and (pair? pattern)
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(pair? (cdr pattern))
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(memq (cadr pattern) indicators-for-zero-or-more)))
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(define indicators-for-zero-or-more (list (string->symbol "...") '---))
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;; end FIXME
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(define rules (cddr exp))
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(define subkeywords (cadr exp))
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(define %input (r '%input)) ;Gensym these, if you like.
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(define %compare (r '%compare))
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(define %rename (r '%rename))
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(define %tail (r '%tail))
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(define %temp (r '%temp))
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(define (make-transformer rules)
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`(lambda (,%input ,%rename ,%compare)
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(let ((,%tail (cdr ,%input)))
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(cond ,@(map process-rule rules)
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(#t ;;else
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(syntax-error
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"use of macro doesn't match definition"
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,%input))))))
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(define rules (cddr exp))
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(define subkeywords (cadr exp))
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(define (process-rule rule)
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(if (and (pair? rule)
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(pair? (cdr rule))
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(null? (cddr rule)))
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(let ((pattern (cdar rule))
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(template (cadr rule)))
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`((and ,@(process-match %tail pattern))
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(let* ,(process-pattern pattern
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%tail
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(lambda (x) x))
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,(process-template template
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0
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(meta-variables pattern 0 '())))))
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(syntax-error "ill-formed syntax rule" rule)))
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(define (make-transformer rules)
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`(lambda (,%input ,%rename ,%compare)
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(let ((,%tail (cdr ,%input)))
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(cond ,@(map process-rule rules)
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(#t ;;else
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(syntax-error
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"use of macro doesn't match definition"
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,%input))))))
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;; Generate code to test whether input expression matches pattern
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(define (process-rule rule)
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(if (and (pair? rule)
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(pair? (cdr rule))
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(null? (cddr rule)))
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(let ((pattern (cdar rule))
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(template (cadr rule)))
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`((and ,@(process-match %tail pattern))
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(let* ,(process-pattern pattern
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%tail
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(lambda (x) x))
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,(process-template template
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0
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(meta-variables pattern 0 '())))))
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(syntax-error "ill-formed syntax rule" rule)))
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(define (process-match input pattern)
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(cond ((name? pattern)
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(if (member pattern subkeywords)
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`((,%compare ,input (,%rename ',pattern)))
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`()))
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((segment-pattern? pattern)
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(process-segment-match input (car pattern)))
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((pair? pattern)
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`((let ((,%temp ,input))
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(and (pair? ,%temp)
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,@(process-match `(car ,%temp) (car pattern))
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,@(process-match `(cdr ,%temp) (cdr pattern))))))
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((or (null? pattern) (boolean? pattern) (char? pattern))
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`((eq? ,input ',pattern)))
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(#t ;;else
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`((equal? ,input ',pattern)))))
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;; Generate code to test whether input expression matches pattern
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(define (process-segment-match input pattern)
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(let ((conjuncts (process-match '(car l) pattern)))
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(if (null? conjuncts)
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`((list? ,input)) ;+++
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`((let loop ((l ,input))
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(or (null? l)
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(and (pair? l)
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,@conjuncts
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(loop (cdr l)))))))))
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(define (process-match input pattern)
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(cond ((name? pattern)
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(if (member pattern subkeywords)
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`((,%compare ,input (,%rename ',pattern)))
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`()))
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((segment-pattern? pattern)
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(process-segment-match input (car pattern)))
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((pair? pattern)
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`((let ((,%temp ,input))
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(and (pair? ,%temp)
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,@(process-match `(car ,%temp) (car pattern))
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,@(process-match `(cdr ,%temp) (cdr pattern))))))
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((or (null? pattern) (boolean? pattern) (char? pattern))
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`((eq? ,input ',pattern)))
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(#t ;;else
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`((equal? ,input ',pattern)))))
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;; Generate code to take apart the input expression
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;; This is pretty bad, but it seems to work (can't say why).
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(define (process-segment-match input pattern)
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(let ((conjuncts (process-match '(car l) pattern)))
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(if (null? conjuncts)
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`((list? ,input)) ;+++
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`((let loop ((l ,input))
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(or (null? l)
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(and (pair? l)
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,@conjuncts
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(loop (cdr l)))))))))
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(define (process-pattern pattern path mapit)
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(cond ((name? pattern)
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(if (memq pattern subkeywords)
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'()
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(list (list pattern (mapit path)))))
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((segment-pattern? pattern)
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(process-pattern (car pattern)
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%temp
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(lambda (x) ;temp is free in x
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(mapit (if (eq? %temp x)
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path ;+++
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`(map (lambda (,%temp) ,x)
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,path))))))
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((pair? pattern)
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(append (process-pattern (car pattern) `(car ,path) mapit)
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(process-pattern (cdr pattern) `(cdr ,path) mapit)))
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(#t ;;else
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'())))
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;; Generate code to take apart the input expression
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;; This is pretty bad, but it seems to work (can't say why).
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;; Generate code to compose the output expression according to template
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(define (process-pattern pattern path mapit)
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(cond ((name? pattern)
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(if (memq pattern subkeywords)
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'()
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(list (list pattern (mapit path)))))
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((segment-pattern? pattern)
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(process-pattern (car pattern)
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%temp
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(lambda (x) ;temp is free in x
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(mapit (if (eq? %temp x)
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path ;+++
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`(map (lambda (,%temp) ,x)
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,path))))))
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((pair? pattern)
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(append (process-pattern (car pattern) `(car ,path) mapit)
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(process-pattern (cdr pattern) `(cdr ,path) mapit)))
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(#t ;;else
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'())))
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(define (process-template template rank env)
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(cond ((name? template)
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(let ((probe (assq template env)))
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(if probe
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(if (<= (cdr probe) rank)
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template
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(syntax-error "template rank error (too few ...'s?)"
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template))
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`(,%rename ',template))))
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((segment-template? template)
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(let ((vars
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(free-meta-variables (car template) (+ rank 1) env '())))
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(if (null? vars)
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(syntax-error "too many ...'s" template)
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(let* ((x (process-template (car template)
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(+ rank 1)
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env))
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(gen (if (equal? (list x) vars)
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x ;+++
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`(map (lambda ,vars ,x)
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,@vars))))
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(if (null? (cddr template))
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gen ;+++
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`(append ,gen ,(process-template (cddr template)
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rank env)))))))
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((pair? template)
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`(cons ,(process-template (car template) rank env)
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,(process-template (cdr template) rank env)))
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(#t ;;else
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`(quote ,template))))
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;; Generate code to compose the output expression according to template
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;; Return an association list of (var . rank)
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(define (process-template template rank env)
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(cond ((name? template)
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(let ((probe (assq template env)))
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(if probe
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(if (<= (cdr probe) rank)
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template
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(syntax-error "template rank error (too few ...'s?)"
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template))
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`(,%rename ',template))))
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((segment-template? template)
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(let ((vars
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(free-meta-variables (car template) (+ rank 1) env '())))
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(if (null? vars)
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(syntax-error "too many ...'s" template)
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(let* ((x (process-template (car template)
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(+ rank 1)
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env))
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(gen (if (equal? (list x) vars)
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x ;+++
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`(map (lambda ,vars ,x)
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,@vars))))
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(if (null? (cddr template))
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gen ;+++
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`(append ,gen ,(process-template (cddr template)
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rank env)))))))
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((pair? template)
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`(cons ,(process-template (car template) rank env)
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,(process-template (cdr template) rank env)))
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(#t ;;else
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`(quote ,template))))
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(define (meta-variables pattern rank vars)
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(cond ((name? pattern)
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(if (memq pattern subkeywords)
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vars
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(cons (cons pattern rank) vars)))
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((segment-pattern? pattern)
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(meta-variables (car pattern) (+ rank 1) vars))
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((pair? pattern)
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(meta-variables (car pattern) rank
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(meta-variables (cdr pattern) rank vars)))
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(#t ;;else
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vars)))
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;; Return an association list of (var . rank)
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;; Return a list of meta-variables of given higher rank
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(define (meta-variables pattern rank vars)
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(cond ((name? pattern)
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(if (memq pattern subkeywords)
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vars
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(cons (cons pattern rank) vars)))
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((segment-pattern? pattern)
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(meta-variables (car pattern) (+ rank 1) vars))
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((pair? pattern)
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(meta-variables (car pattern) rank
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(meta-variables (cdr pattern) rank vars)))
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(#t ;;else
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vars)))
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(define (free-meta-variables template rank env free)
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(cond ((name? template)
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(if (and (not (memq template free))
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(let ((probe (assq template env)))
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(and probe (>= (cdr probe) rank))))
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(cons template free)
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free))
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((segment-template? template)
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(free-meta-variables (car template)
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rank env
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(free-meta-variables (cddr template)
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rank env free)))
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((pair? template)
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(free-meta-variables (car template)
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rank env
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(free-meta-variables (cdr template)
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rank env free)))
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(#t ;;else
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free)))
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;; Return a list of meta-variables of given higher rank
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c ;ignored
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(define (free-meta-variables template rank env free)
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(cond ((name? template)
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(if (and (not (memq template free))
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(let ((probe (assq template env)))
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(and probe (>= (cdr probe) rank))))
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(cons template free)
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free))
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((segment-template? template)
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(free-meta-variables (car template)
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rank env
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(free-meta-variables (cddr template)
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rank env free)))
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((pair? template)
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(free-meta-variables (car template)
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rank env
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(free-meta-variables (cdr template)
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rank env free)))
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(#t ;;else
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free)))
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(display "HELLO")
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(newline)
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c ;ignored
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;; Kludge for Scheme48 linker.
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;; `(cons ,(make-transformer rules)
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;; ',(find-free-names-in-syntax-rules subkeywords rules))
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(display "HELLO")
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(newline)
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(make-transformer rules))))
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;; Kludge for Scheme48 linker.
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;; `(cons ,(make-transformer rules)
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;; ',(find-free-names-in-syntax-rules subkeywords rules))
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(make-transformer rules)))))
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(mes:define-syntax mes:or
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