syntax-quote, *listname-registry*

This commit is contained in:
ESL 2024-07-06 13:13:44 -04:00
parent 23f278f767
commit ab334f4813
2 changed files with 111 additions and 90 deletions

View file

@ -208,7 +208,7 @@
; These names are bound to specials never returned by xform:
; (syntax <value>)
; (syntax-quote <value>)
; (body <expr or def> ...)
; (syntax-lambda (<id> ...) <expr>)
; (syntax-rules (<id> ...) <rule> ...)
@ -262,7 +262,7 @@
; <location> -> #&<value>
; <value> -> <special> | <core>
; <special> -> <builtin> | <integrable> | <transformer>
; <builtin> -> syntax | quote | set! | set& | if | lambda | lambda* |
; <builtin> -> syntax-quote | quote | set! | set& | if | lambda | lambda* |
; letcc | withcc | body | begin | define | define-syntax |
; syntax-lambda | syntax-rules | syntax-length | syntax-error
; <integrable> -> <fixnum serving as index in internal integrables table>
@ -328,11 +328,11 @@
(define (check-syntax sexp pat msg)
(unless (sexp-match? pat sexp) (x-error msg sexp)))
(define syntax-id (new-id 'syntax (make-location 'syntax) #f))
(define lambda-id (new-id 'lambda (make-location 'lambda) #f))
(define begin-id (new-id 'begin (make-location 'begin) #f))
(define define-id (new-id 'define (make-location 'define) #f))
(define define-syntax-id (new-id 'define-syntax (make-location 'define-syntax) #f))
(define syntax-quote-id (new-id 'syntax-quote (make-location 'syntax-quote) #f))
; xform receives Scheme s-expressions and returns either Core Scheme <core>
; (always a pair) or special-form, which is either a builtin (a symbol) or
@ -355,7 +355,6 @@
[else
(let* ([head (car sexp)] [tail (cdr sexp)] [hval (xform #t head env)])
(case hval
[(syntax) (xform-syntax tail env)]
[(quote) (xform-quote tail env)]
[(set!) (xform-set! tail env)]
[(set&) (xform-set& tail env)]
@ -368,6 +367,7 @@
[(begin) (xform-begin tail env appos?)]
[(define) (xform-define tail env)]
[(define-syntax) (xform-define-syntax tail env)]
[(syntax-quote) (xform-syntax-quote tail env)]
[(syntax-lambda) (xform-syntax-lambda tail env appos?)]
[(syntax-rules) (xform-syntax-rules tail env)]
[(syntax-length) (xform-syntax-length tail env)]
@ -380,11 +380,6 @@
(xform appos? (hval sexp env) env)
(xform-call hval tail env)))]))]))
(define (xform-syntax tail env)
(if (list1? tail)
(car tail) ; must be <core>, todo: check?
(x-error "improper syntax form" (cons 'syntax tail))))
(define (xform-quote tail env)
(if (list1? tail)
(list 'quote (xform-sexp->datum (car tail)))
@ -581,16 +576,21 @@
(list 'define-syntax (id->sym (car tail)) (xform #t (cadr tail) env))
(x-error "improper define-syntax form" (cons 'define-syntax tail))))
(define (xform-syntax-quote tail env)
(if (list1? tail)
(car tail) ; must be <core>, todo: check?
(x-error "improper syntax-quote form" (cons 'syntax-quote tail))))
(define (xform-syntax-lambda tail env appos?)
(if (and (list2+? tail) (andmap id? (car tail)))
(let ([vars (car tail)] [macenv env] [forms (cdr tail)])
; return a transformer that wraps xformed body in (syntax ...)
; return a transformer that wraps xformed body in (syntax-quote ...)
; to make sure xform treats it as final <core> form and exits the loop
(lambda (use useenv)
(if (and (list1+? use) (fx=? (length vars) (length (cdr use))))
(let loop ([vars vars] [exps (cdr use)] [env macenv])
(if (null? vars)
(list syntax-id (xform-body forms env appos?))
(list syntax-quote-id (xform-body forms env appos?))
(loop (cdr vars) (cdr exps)
(extend-xenv-local (car vars)
(xform #t (car exps) useenv) env))))
@ -868,8 +868,7 @@
(let ([ic&ex (preprocess-library s env)])
(return (car ic&ex) (cdr ic&ex)))]
[(and (list1+? s) (andmap libpart? s))
(let* ([lib (xform-sexp->datum s)]
[sym (if (symbol? lib) lib (listname->symbol lib))]
(let* ([lib (xform-sexp->datum s)] [sym (listname->symbol lib)]
[core (xform #f sym env)]) ; #f to run id-syntax (in mac-env?)
(check-syntax core '(quote ((<symbol> * ...) (<symbol> . *) ...))
"library import set does not refer to a valid library")
@ -1639,6 +1638,9 @@
; Library names and library file lookup
;---------------------------------------------------------------------------------------------
(define (lnpart? x) (or (id? x) (exact-integer? x)))
(define (listname? x) (and (list1+? x) (andmap lnpart? x)))
(define (mangle-symbol->string sym)
(define safe '(#\! #\$ #\- #\_ #\=))
(let loop ([lst (string->list (symbol->string sym))] [text '()])
@ -1844,7 +1846,6 @@
(define-in-root-environment! 'cond-expand
(make-location (make-cond-expand-transformer)) #t)
; now put the builtins (lazily) and others
(let ([put! (lambda (k loc) (define-in-root-environment! k loc #t))])
@ -1870,19 +1871,29 @@
(define (root-environment id at)
(env-lookup id *root-environment* at))
;---------------------------------------------------------------------------------------------
; Library registry and built-in libraries
; List-name registry and built-in libraries
;---------------------------------------------------------------------------------------------
(define *library-registry* '()) ; alist of a form ((libsym . ic&ex) ...)
(define *listname-registry* '()) ; alist of a form ((listname . <location>) ...)
(define (library-info lib alloc?) ;=> (code . eal) | #f
(let ([key (if (symbol? lib) lib (listname->symbol lib))])
(cond [(assq key *library-registry*) => cdr]
[(not alloc?) #f]
[else (let ([ic&ex (cons '(begin) '())])
(set! *library-registry* (cons (cons key ic&ex) *library-registry*))
ic&ex)])))
(define (listname-lookup listname alloc?) ;=> <location> | #f
(cond [(assoc listname *listname-registry*) => cdr]
[(not alloc?) #f]
[else (let ([loc (make-location '(undefined))])
(set! *listname-registry* (cons (cons listname loc) *listname-registry*))
loc)]))
; specialized version for libraries
(define (library-info listname alloc?) ;=> ic&ex | #f
(let ([loc (listname-lookup listname alloc?)])
(and loc
(let* ([v (location-val loc)] [q? (and (pair? v) (eq? (car v) 'quote))])
(if q? (cadr v)
(let ([ic&ex (cons '(begin) '())])
(location-set-val! loc (list 'quote ic&ex))
ic&ex))))))
(for-each
(lambda (r)
@ -1971,15 +1982,13 @@
; add std libraries to root env as expand time mappings of library's symbolic name
; to an identifyer-syntax expanding into (quote (<init-code> . <eal>)) form
; NB: later, this will need to be done via auto-allocating denotations!
(let ([syntax-id (new-id 'syntax (make-location 'syntax) #f)])
(for-each
(lambda (p)
(let* ([sym (car p)] [ic&ex (cdr p)])
(define (libid-transformer sexp env)
(list syntax-id (list 'quote ic&ex)))
(define-in-root-environment! sym
(make-location libid-transformer) #t)))
*library-registry*))
(for-each
(lambda (p) ; we can rely on the fact that p is (listname . #&(quote ic&ex))
(let* ([listname (car p)] [val (location-val (cdr p))])
(define (libid-transformer sexp env) (list syntax-quote-id val))
(define-in-root-environment! (listname->symbol listname)
(make-location libid-transformer) #t)))
*listname-registry*)
@ -2042,7 +2051,7 @@
(let* ([core (xform-define-library (car x) (cdr x) env #f)]
[loc (xenv-lookup env (cadr core) 'define-syntax)])
(if loc ; location or #f
(let* ([qie (caddr core)] [val (lambda (sexp env) (list syntax-id qie))])
(let* ([qie (caddr core)] [val (lambda (sexp env) (list syntax-quote-id qie))])
(location-set-val! loc val)) ; wrapped in identifier-syntax transformer
(x-error "identifier cannot be (re)defined as syntax in env:"
(cadr core) env))
@ -2051,7 +2060,8 @@
(let* ([core (xform-import (car x) (cdr x) env #f)] ; core is (import (quote ic&ex))
[ic&ex (cadadr core)] [code (car ic&ex)] [eal (cdr ic&ex)])
(define (define-alias p)
(repl-eval-top-form (list define-syntax-id (car p) (list syntax-id (location-val (cdr p)))) env))
(repl-eval-top-form
(list define-syntax-id (car p) (list syntax-quote-id (location-val (cdr p)))) env))
(repl-compile-and-run-core-expr code)
(for-each define-alias eal))]
[(procedure? hval) ; transformer: apply and loop

123
t.c
View file

@ -190,9 +190,6 @@ char *t_code[] = {
"P", "check-syntax",
"%3${.2,.4,@(y11:sexp-match?)[02}~?{.0,.3,@(y7:x-error)[32}]3",
"C", 0,
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"C", 0,
"${f,'(y6:lambda)b,'(y6:lambda),@(y6:new-id)[03}@!(y9:lambda-id)",
@ -206,31 +203,31 @@ char *t_code[] = {
"${f,'(y13:define-syntax)b,'(y13:define-syntax),@(y6:new-id)[03}@!(y16:"
"define-syntax-id)",
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@ -356,14 +353,18 @@ char *t_code[] = {
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@ -488,14 +489,14 @@ char *t_code[] = {
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@ -886,6 +887,12 @@ char *t_code[] = {
"(y14:path-directory)[01},.2,@(y34:file-resolve-relative-to-base-path)["
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"P", "lnpart?",
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@ -983,12 +990,15 @@ char *t_code[] = {
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"C", 0,
"n@!(y18:*library-registry*)",
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@ -1139,9 +1149,9 @@ char *t_code[] = {
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@ -1171,18 +1181,19 @@ char *t_code[] = {
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