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|
; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Mike Sperber
(define-syntax define-record-type
(let ((uid-count 0))
(lambda (e r c)
;; returns clause or #f
(define (search-clause keyword clauses)
(let loop ((clauses clauses))
(cond
((null? clauses)
#f)
((c keyword (caar clauses))
(let ((clause (car clauses)))
;; rudimentary checks
(cond
((not (list? clause))
(syntax-violation 'define-record-type "invalid clause" e clause))
((search-clause keyword (cdr clauses))
=> (lambda (duplicate)
(syntax-violation 'define-record-type "duplicate clause" e clause)))
(else
clause))))
(else (loop (cdr clauses))))))
(define (clause-value clause value-ok?)
(cond
((not clause) #f)
((not (= (length clause) 2))
(syntax-violation 'define-record-type "invalid clause" clause))
((not (value-ok? (cadr clause)))
(syntax-violation 'define-record-type "invalid clause value" clause))
(else
(cadr clause))))
(define s->s symbol->string)
(define s-conc (lambda args (string->symbol (apply string-append args))))
(define %mutable (r 'mutable))
(define %immutable (r 'immutable))
;; returns a field desc; each desc is a three-element list:
;; field-name accessor-name (maybe mutator-name)
(define (parse-field-spec record-name-string field-spec)
(cond
((symbol? field-spec)
(list field-spec
(s-conc record-name-string "-" (s->s field-spec))
#f))
((and (pair? field-spec)
(pair? (cdr field-spec)))
(let ((tag (car field-spec))
(field (cadr field-spec))
(size (length field-spec)))
(cond
((c tag %immutable)
(case size
((2)
(list field
(s-conc record-name-string "-" (s->s field))
#f))
((3)
(list field
(caddr field-spec)
#f))
(else
(syntax-violation 'define-record-type "invalid field spec" e field-spec))))
((c tag %mutable)
(case size
((2)
(list field
(s-conc record-name-string "-" (s->s field))
(s-conc record-name-string "-" (s->s field) "-set!")))
((4)
(list field
(caddr field-spec)
(cadddr field-spec)))
(else
(syntax-violation 'define-record-type "invalid field spec" e field-spec))))
(else
(syntax-violation 'define-record-type "invalid field spec" e field-spec)))))
(else
(syntax-violation 'define-record-type "invalid field spec" e field-spec))))
(let ((name-spec (cadr e))
(clauses (cddr e)))
(call-with-values
(lambda ()
(cond ((symbol? name-spec) ; probably barfs on generated name
(values name-spec
(s-conc "make-" (s->s name-spec))
(s-conc (s->s name-spec) "?")))
((or (not (list? name-spec))
(not (= 3 (length name-spec))))
(syntax-violation 'define-record-type "invalid name spec" e name-spec))
(else
(apply values name-spec))))
(lambda (record-name constructor-name predicate-name)
(let ((record-name-string (s->s record-name))
(field-specs
(cond
((search-clause (r 'fields) clauses)
=> cdr)
(else '())))
(parent (clause-value (search-clause (r 'parent) clauses) symbol?)) ; probably barfs on generated names
(protocol (clause-value (search-clause (r 'protocol) clauses) values))
(sealed? (clause-value (search-clause (r 'sealed) clauses) boolean?))
(opaque? (clause-value (search-clause (r 'opaque) clauses) boolean?))
(nongenerative-clause (search-clause (r 'nongenerative) clauses))
(parent-rtd-clause (search-clause (r 'parent-rtd) clauses)))
(if (and parent parent-rtd-clause)
(syntax-violation 'define-record-type "can't have both `parent' and `parent-rtd' clauses"
e))
(if (and parent-rtd-clause
(or (not (list? parent-rtd-clause))
(not (= 3 (length parent-rtd-clause)))))
(syntax-violation 'define-record-type "invalid `parent-rtd' clause" e parent-rtd-clause))
(let ((field-descs
;; cons field index onto descs
(let loop ((i 0) (field-specs field-specs) (res '()))
(if (null? field-specs)
(reverse res)
(loop (+ 1 i)
(cdr field-specs)
(cons (cons i (parse-field-spec record-name-string (car field-specs)))
res)))))
(nongenerative-uid
(and nongenerative-clause
(let ((size (length nongenerative-clause)))
(cond
((= size 1)
(set! uid-count (+ 1 uid-count)) ; #### not enough in the presence of separate compilation
(s-conc "record-type-" (number->string uid-count)))
((= size 2)
(cadr nongenerative-clause))
(else
(syntax-violation 'define-record-type "invalid `nongenerative' clause" e nongenerative-clause))))))
(parent-rtd
(cond
(parent
`(,(r 'record-type-descriptor) ,parent))
(parent-rtd-clause => cadr)
(else #f)))
(parent-cd
(cond
(parent
`(,(r 'record-constructor-descriptor) ,parent))
(parent-rtd-clause => caddr)
(else #f)))
(rtd-name (r 'record-rtd))
(cd-name (r 'cd))
(%define (r 'define)))
`(,(r 'begin)
(,%define ,rtd-name
(,(r 'make-record-type-descriptor)
',record-name
,parent-rtd
',nongenerative-uid
,sealed?
,opaque?
',(list->vector
(map
(lambda (desc)
(apply (lambda (index name accessor mutator)
(list (if mutator
'mutable
'immutable)
name))
desc))
field-descs))))
(,%define ,cd-name
(,(r 'make-record-constructor-descriptor)
,rtd-name
,parent-cd
,protocol))
,(cond
(parent
`(,parent
,(r 'dispatch)
(,record-name
,constructor-name ,predicate-name
,rtd-name ,cd-name
,parent ,protocol ,sealed? ,opaque? ,nongenerative-uid ,parent-rtd ,parent-cd
,field-descs)
,(r 'define-known-record-type-helper)
,(r 'define-unknown-record-type-helper)))
(parent-rtd-clause
`(,(r 'define-unknown-record-type-helper)
,record-name
,constructor-name ,predicate-name
,rtd-name ,cd-name
,parent ,protocol ,sealed? ,opaque? ,nongenerative-uid ,parent-rtd ,parent-cd
,field-descs))
(else
`(,(r 'define-known-record-type-helper)
0 #t
,record-name
,constructor-name ,predicate-name
,rtd-name ,cd-name
,parent ,protocol ,sealed? ,opaque? ,nongenerative-uid ,parent-rtd ,parent-cd
,field-descs))))))))))))
; fallback: the supertype isn't completely known statically
(define-syntax define-unknown-record-type-helper
(lambda (e r c)
(define %begin (r 'begin))
(define %define (r 'define))
(define %record-accessor (r 'record-accessor))
(define %record-mutator (r 'record-mutator))
(define %loophole (r 'loophole))
(define %:value (r ':value))
(define %:unspecific (r ':value))
(define %proc (r 'proc))
(apply
(lambda (_ record-name constructor-name predicate-name rtd-name cd-name
parent protocol sealed? opaque? nongenerative-uid parent-rtd parent-cd
field-descs)
`(,%begin
(,(r 'define-unknown-record-type-name) ,record-name ,rtd-name ,cd-name)
(,%define ,constructor-name
(,(r 'record-constructor) ,cd-name))
(,%define ,predicate-name (,(r 'record-predicate) ,rtd-name))
,@(map (lambda (desc)
(apply (lambda (index name accessor mutator)
(let ((acc
`(,%define ,accessor
(,%loophole (,%proc (,rtd-name) ,%:value)
(,%record-accessor ,rtd-name ,index)))))
(if mutator
`(,%begin
,acc
(,%define ,mutator
(,%loophole (,%proc (,rtd-name ,%:value) ,%:unspecific)
(,%record-mutator ,rtd-name ,index))))
acc)))
desc))
field-descs)))
e)))
; This knows about the implementation of records and creates
; constructor, accessors, mutators, etc. directly instead of calling
; the procedures from r6rs-records-procedural. This is done to allow
; the optional auto-inlining optimizer to inline the accessors,
; mutators, etc.
(define-syntax define-known-record-type-helper
(lambda (e r c)
(define %begin (r 'begin))
(define %define (r 'define))
(define %record (r 'record))
(define %checked-record-ref (r 'checked-record-ref))
(define %checked-record-set! (r 'checked-record-set!))
(define %r (r 'r))
(define %val (r 'val))
(define %loophole (r 'loophole))
(define %:value (r ':value))
(define %:unspecific (r ':value))
(define %proc (r 'proc))
(define (build-args count)
(let loop ((i count)
(args '()))
(if (zero? i)
args
(loop (- i 1)
(cons (r (string->symbol (string-append "arg-" (number->string i))))
args)))))
(apply
(lambda (_ parent-field-count parent-default-constructor?
record-name constructor-name predicate-name rtd-name cd-name
parent protocol sealed? opaque? nongenerative-uid parent-rtd parent-cd
field-descs)
(let ((field-count (+ parent-field-count (length field-descs)))
(default-constructor? (and parent-default-constructor? (not protocol))))
`(,%begin
(,(r 'define-known-record-type-name) ,record-name ,rtd-name ,cd-name
,field-count ,default-constructor?)
,(if default-constructor?
(let ((args (build-args field-count)))
`(,%define (,constructor-name . ,args)
(,%loophole (,%proc ,(map (lambda (_) %:value) args) ,rtd-name)
(,%record ,rtd-name . ,args))))
`(,%define ,constructor-name (,(r 'record-constructor) ,cd-name)))
(,%define ,predicate-name (,(r 'record-predicate) ,rtd-name))
,@(map (lambda (desc)
(apply (lambda (index name accessor mutator)
(let* ((real-index (+ 1 parent-field-count index))
(acc
`(,%define (,accessor ,%r)
(,%loophole (,%proc (,rtd-name) ,%:value)
(,%checked-record-ref ,%r ,rtd-name
,real-index)))))
(if mutator
`(,%begin
,acc
(,%define (,mutator ,%r ,%val)
(,%loophole (,%proc (,rtd-name ,%:value) ,%:unspecific)
(,%checked-record-set! ,%r ,rtd-name ,real-index ,%val))))
acc)))
desc))
field-descs))))
e)))
(define-syntax define-known-record-type-name
(syntax-rules ()
((define-known-record-type-name ?name ?rtd ?constructor-descriptor ?field-count ?default-constructor?)
(define-syntax ?name
(syntax-rules (descriptor constructor-descriptor dispatch)
((?name descriptor) ?rtd)
((?name constructor-descriptor) ?constructor-descriptor)
((?name dispatch ?args ?known ?unknown) (?known ?field-count ?default-constructor? . ?args)))))))
(define-syntax define-unknown-record-type-name
(syntax-rules ()
((define-unknown-record-type-name ?name ?rtd ?constructor-descriptor)
(define-syntax ?name
(syntax-rules (descriptor constructor-descriptor dispatch)
((?name descriptor) ?rtd)
((?name constructor-descriptor) ?constructor-descriptor)
((?name dispatch ?args ?known ?unknown) (?unknown . ?args)))))))
; Retrofitting RTS record types to R6RS record types.
; For now, we do default constructors only.
; (define-retrofitted-record-type r6rs-type rts-type (mutable field1) (immutable field2) ...)
; (define-retrofitted-record-type (r6rs-type r6rs-base-type) rts-type (mutable field1) ...)
(define-syntax define-retrofitted-record-type
(lambda (e r c)
(cons (r 'define-retrofitted-record-type-helper)
(cons (length (list-tail e 6))
(cdr e)))))
(define-syntax define-retrofitted-record-type-helper
(syntax-rules ()
((define-retrofitted-record-type-helper ?field-count
(?r6rs-type ?r6rs-parent-type) ?rts-type ?uid ?sealed? ?opaque? ?field-spec1 ...)
(begin
(retrofit-record-type! ?rts-type ?uid ?sealed? ?opaque? '#(?field-spec1 ...))
(define cd (make-record-constructor-descriptor ?rts-type #f #f))
(?r6rs-parent-type dispatch (?r6rs-type ?rts-type cd ?field-count)
define-known-retrofitted-record-type-helper
define-unknown-retrofitted-record-type-helper)))
((define-retrofitted-record-type-helper ?field-count
?r6rs-type ?rts-type ?uid ?sealed? ?opaque? ?field-spec1 ...)
(begin
(retrofit-record-type! ?rts-type ?uid ?sealed? ?opaque? '#(?field-spec1 ...))
(define cd (make-record-constructor-descriptor ?rts-type #f #f))
(define-known-record-type-name ?r6rs-type ?rts-type cd ?field-count #t)))))
(define-syntax define-known-retrofitted-record-type-helper
(lambda (e r c)
(apply
(lambda (_ parent-field-count parent-default-constructor? r6rs-type rts-type cd field-count)
`(,(r 'define-known-record-type-name)
,r6rs-type ,rts-type ,cd ,(+ parent-field-count field-count) ,parent-default-constructor?))
e)))
(define-syntax define-unknown-retrofitted-record-type-helper
(lambda (e r c)
(apply
(lambda (_ r6rs-type rts-type cd field-count)
`(,(r 'define-unknown-record-type-name) ,r6rs-type ,rts-type ,cd))
e)))
(define-syntax record-type-descriptor
(syntax-rules ()
((record-type-descriptor ?type)
(?type descriptor))))
(define-syntax record-constructor-descriptor
(syntax-rules ()
((record-constructor-descriptor ?type)
(?type constructor-descriptor))))
|
