/usr/share/racket/pkgs/frtime/struct.rkt is in racket-common 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require racket/struct-info
(for-syntax racket/base)
(for-template racket/base))
(provide build-struct-names
build-struct-generation
build-struct-expand-info
struct-declaration-info?
extract-struct-info
generate-struct-declaration
generate-delayed-struct-declaration)
;; build-struct-names : id (list-of id) bool bool -> (list-of id)
(define build-struct-names
(lambda (name-stx fields omit-sel? omit-set? [srcloc-stx #f])
(let ([name (symbol->string (syntax-e name-stx))]
[fields (map symbol->string (map syntax-e fields))]
[+ string-append])
(map (lambda (s)
(datum->syntax name-stx (string->symbol s) srcloc-stx))
(append
(list
(+ "struct:" name)
(+ "make-" name)
(+ name "?"))
(let loop ([l fields])
(if (null? l)
null
(append
(if omit-sel?
null
(list (+ name "-" (car l))))
(if omit-set?
null
(list (+ "set-" name "-" (car l) "!")))
(loop (cdr l))))))))))
(define build-struct-generation
(lambda (name-stx fields omit-sel? omit-set? [super-type #f] [prop-value-list #'null]
[immutable-positions #'null] [mk-rec-prop-list (lambda (struct: make- ? acc mut) #'null)])
(let ([names (build-struct-names name-stx fields omit-sel? omit-set?)])
(build-struct-generation* names name-stx fields omit-sel? omit-set? super-type prop-value-list
immutable-positions mk-rec-prop-list))))
(define build-struct-generation*
(lambda (names name fields omit-sel? omit-set? [super-type #f] [prop-value-list #'null]
[immutable-positions #'null] [mk-rec-prop-list (lambda (struct: make- ? acc mut) #'null)])
(let ([num-fields (length fields)]
[acc/mut-makers (let loop ([l fields][n 0])
(if (null? l)
null
(let ([mk-one
(lambda (acc?)
(list
`(,(if acc?
'frp:make-struct-field-accessor
'frp:make-struct-field-mutator)
,(if acc? 'acc 'mut)
,n ',(car l))))])
(append
(if omit-sel?
null
(mk-one #t))
(if omit-set?
null
(mk-one #f))
(loop (cdr l) (add1 n))))))]
[extra-props (mk-rec-prop-list 'struct: 'make- '? 'acc 'mut)])
`(let-values ([(struct: make- ? acc mut)
(frp:make-struct-type ',name ,super-type ,num-fields 0 #f ,prop-value-list #f #f ,immutable-positions)])
(values struct:
make-
?
,@acc/mut-makers)))))
(define build-struct-expand-info
(lambda (name-stx fields omit-sel? omit-set? base-name base-getters base-setters)
(let* ([names (build-struct-names name-stx fields omit-sel? omit-set?)])
(build-struct-expand-info* names name-stx fields omit-sel? omit-set? base-name base-getters base-setters))))
(define build-struct-expand-info*
(lambda (names name-stx fields omit-sel? omit-set? base-name base-getters base-setters)
(let* ([flds (cdddr names)]
[every-other (lambda (l)
(let loop ([l l])
(cond
[(null? l) null]
[(null? (cdr l)) (list (car l))]
[else (cons (car l) (loop (cddr l)))])))]
[add-#f (lambda (omit? base)
(if omit?
(when (let loop ([l base])
(cond
[(null? l) #t]
[(not (car l)) #f]
[else (loop (cdr l))]))
(append base '(#f)))
base))]
[cert-f (gensym)]
[qs (lambda (x) (if (eq? x #t)
x
(and x `(,cert-f (quote-syntax ,x)))))])
`(let ([,cert-f (syntax-local-certifier #t)])
(list
,(qs (car names))
,(qs (cadr names))
,(qs (caddr names))
(list
,@(reverse (if omit-sel?
null
(map qs (if omit-set? flds (every-other flds)))))
,@(map qs (add-#f omit-sel? base-getters)))
(list
,@(reverse (if omit-set?
null
(map qs (if omit-sel?
flds
(every-other (if (null? flds)
null
(cdr flds)))))))
,@(map qs (add-#f omit-set? base-setters)))
,(qs base-name))))))
(define (struct-declaration-info? x)
(struct-info? x))
;; ----------------------------------------
(define struct-info-type-id car)
(define struct-info-constructor-id cadr)
(define struct-info-predicate-id caddr)
(define struct-info-accessor-ids cadddr)
(define struct-info-mutator-ids (lambda (x) (list-ref x 4)))
(define (get-stx-info orig-stx super-id defined-names gen-expr?)
;; Looks up super info, if needed, and builds compile-time info for the
;; new struct; called by all three forms, but does only half the work
;; if `defined-names' is #f.
;; If `expr?' is #t, then generate an expression to build the info,
;; otherwise build the info directly.
(let* ([cert-f (gensym)]
[qs (if gen-expr? (lambda (x) #`(#,cert-f (quote-syntax #,x))) values)]
[every-other (lambda (l)
(let loop ([l l][r null])
(cond
[(null? l) r]
[(null? (cdr l)) (cons (car l) r)]
[else (loop (cddr l) (cons (car l) r))])))]
[super-si (and super-id
(syntax-local-value super-id (lambda () #f)))]
[super-info (and super-si
(struct-declaration-info? super-si)
(extract-struct-info super-si))])
(when super-id
;; Did we get valid super-info ?
(when (or (not (struct-declaration-info? super-si))
(not (struct-info-type-id super-info)))
(raise-syntax-error
#f
(if (struct-declaration-info? super-si)
"parent struct information does not include a type for subtyping"
(format "parent struct type not defined~a"
(if super-info
(format " (~a does not name struct type information)"
(syntax-e super-id))
"")))
orig-stx
super-id)))
;; Generate the results:
(values
super-info
(if defined-names
(let-values ([(initial-gets initial-sets)
(if super-info
(values (map qs (struct-info-accessor-ids super-info))
(map qs (struct-info-mutator-ids super-info)))
(values null null))]
[(fields) (cdddr defined-names)]
[(wrap) (if gen-expr? (lambda (x) #`(list #,@x)) values)])
#`(let ([#,cert-f (syntax-local-certifier #t)])
(make-struct-info
(lambda ()
#,(wrap
(list (qs (car defined-names))
(qs (cadr defined-names))
(qs (caddr defined-names))
(wrap
(apply
list
(append (map qs (every-other fields))
initial-gets)))
(wrap
(apply
list
(append (map qs (if (null? fields)
null
(every-other (cdr fields))))
initial-sets)))
(if super-id
(qs super-id)
#t)))))))
#f))))
(define (make-core make-make-struct-type orig-stx defined-names super-info name field-names)
#`(let-values ([(type maker pred access mutate)
#,(make-make-struct-type orig-stx name defined-names super-info)])
(values type maker pred
#,@(let loop ([field-names field-names][n 0])
(if (null? field-names)
null
(list* #`(make-struct-field-accessor access #,n '#,(car field-names))
#`(make-struct-field-mutator mutate #,n '#,(car field-names))
(loop (cdr field-names) (add1 n))))))))
(define (generate-struct-declaration orig-stx
name super-id field-names
context
make-make-struct-type
continue-macro-id continue-data)
(let ([defined-names (build-struct-names name field-names #f #f name)]
[delay? (and (not (memq context '(module top-level expression)))
super-id)])
(let-values ([(super-info stx-info)
(if delay?
(values #f #f)
(get-stx-info orig-stx super-id defined-names #t))])
(let ([result
#`(begin
(define-values
#,defined-names
#,(if delay?
#`(begin0 ;; the `begin0' guarantees that it's an expression
(#,continue-macro-id #,orig-stx #,name #,super-id
#,defined-names #,field-names
#,continue-data))
(make-core make-make-struct-type orig-stx defined-names super-info name field-names)))
(define-syntaxes (#,name)
#,(if delay?
#`(let-values ([(super-info stx-info)
(get-stx-info (quote-syntax ,orig-stx)
(quote-syntax ,super-id)
(list #,@(map (lambda (x)
#`(quote-syntax #,x))
defined-names))
#f
values)])
stx-info)
stx-info)))])
(if super-id
(syntax-property result
'disappeared-use
(syntax-local-introduce super-id))
result)))))
(define (generate-delayed-struct-declaration stx make-make-make-struct-type)
(syntax-case stx ()
[(_ orig-stx name super-id defined-names field-names continue-data)
(let-values ([(super-info stx-info) (get-stx-info #'orig-stx #'super-id #f #f)])
(make-core (make-make-make-struct-type #'continue-data)
#'orig-stx
(syntax->list #'defined-names)
super-info
#'name
(syntax->list #'field-names)))]))
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