258 lines
9.4 KiB
Scheme
258 lines
9.4 KiB
Scheme
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(library (ikarus.r6rs.records.procedural)
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(export
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make-record-type-descriptor
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make-record-constructor-descriptor
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record-accessor record-mutator
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record-constructor record-predicate)
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(import
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(except (ikarus) record-constructor record-predicate)
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(ikarus system $records))
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(define-record rtd (name size parent sealed? opaque? uid fields))
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(define rtd-alist '())
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(define (intern-rtd! uid rtd)
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(set! rtd-alist (cons (cons uid rtd) rtd-alist)))
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(define (lookup-rtd uid)
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(cond
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[(assq uid rtd-alist) => cdr]
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[else #f]))
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(define (record-type-descriptor? x) (rtd? x))
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(module (make-record-type-descriptor)
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(define who 'make-record-type-descriptor)
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(define (make-rtd-aux name parent uid sealed? opaque? fields)
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(make-rtd name (vector-length fields) parent sealed? opaque? uid fields))
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(define (convert-fields pfv sv)
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(unless (vector? sv)
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(error who "invalid fields argument ~s" sv))
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(let ([n1 (vector-length pfv)]
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[n2 (vector-length sv)])
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(let ([v (make-vector (+ n1 n2))])
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(let f ([i 0])
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(unless (= i n1)
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(vector-set! v i (vector-ref pfv i))
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(f (add1 i))))
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(let f ([i 0])
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(unless (= i n2)
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(let ([x (vector-ref sv i)])
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(if (pair? x)
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(let ([m/u (car x)] [x (cdr x)])
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(if (pair? x)
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(let ([name (car x)])
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(unless (and (null? (cdr x)) (symbol? name))
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(error who "invalid fields argument ~s" sv))
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(vector-set! v (+ i n1)
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(cons (case m/u
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[(mutable) #t]
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[(immutable) #f]
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[else
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(error who "invalid fields argument ~s" sv)])
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name)))
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(error who "invalid fields argument ~s" sv)))
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(error who "invalid fields argument ~s" sv)))
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(f (add1 i))))
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v)))
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(define generate-rtd
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(lambda (name parent uid sealed? opaque? fields)
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(cond
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[(rtd? parent)
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(when (rtd-sealed? parent)
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(error who "cannot extend sealed parent ~s" parent))
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(make-rtd-aux name parent uid sealed?
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(or opaque? (rtd-opaque? parent))
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(convert-fields (rtd-fields parent) fields))]
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[(eqv? parent #f)
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(make-rtd-aux name parent uid sealed? opaque?
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(convert-fields '#() fields))]
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[else (error who "~s is not a valid parent" parent)])))
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(define (same-fields-as-rtd? fields rtd)
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(let* ([fv (rtd-fields rtd)]
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[n (vector-length fv)])
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(and (vector? fields)
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(= (vector-length fields) n)
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(let f ([i 0])
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(or (= i n)
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(let ([a (vector-ref fields i)]
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[b (vector-ref fv i)])
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(and
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(pair? a)
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(case (car a)
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[(mutable) (eqv? (car b) #t)]
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[(immutable) (eqv? (car b) #f)]
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[else #f])
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(let ([a (cdr a)])
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(and (pair? a)
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(null? (cdr a))
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(eq? (car a) (cdr b))))
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(f (+ i 1)))))))))
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(define make-nongenerative-rtd
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(lambda (name parent uid sealed? opaque? fields)
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(cond
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[(lookup-rtd uid) =>
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(lambda (rtd)
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(unless
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(and (eqv? name (rtd-name rtd))
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(eqv? parent (rtd-parent rtd))
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(eqv? sealed? (rtd-sealed? rtd))
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(eqv? opaque? (rtd-opaque? rtd))
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(same-fields-as-rtd? fields rtd))
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(error who "invalid arguments"))
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rtd)]
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[else
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(let ([rtd (generate-rtd name parent uid sealed? opaque? fields)])
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(intern-rtd! uid rtd)
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rtd)])))
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(define make-record-type-descriptor
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(lambda (name parent uid sealed? opaque? fields)
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(unless (symbol? name)
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(error who "~s is not a valid record type name" name))
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(unless (boolean? sealed?)
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(error who "~s is not a valid sealed? argument" sealed?))
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(unless (boolean? opaque?)
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(error who "~s is not a valid opaque? argument" opaque?))
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(cond
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[(symbol? uid)
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(make-nongenerative-rtd name parent uid sealed? opaque? fields)]
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[(eqv? uid #f)
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(generate-rtd name parent uid sealed? opaque? fields)]
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[else (error who "~s is not a valid uid" uid)]))))
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(define-record rcd (rtd pproc proc))
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(define make-record-constructor-descriptor
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(lambda (rtd parent protocol)
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(define who 'make-record-constructor-descriptor)
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(define (make-rcd/default-proto&prcd rtd)
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(make-rcd rtd #f #f))
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(define (make-rcd/default-proto rtd parent)
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(cond
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[(not parent)
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(make-rcd/default-proto&prcd rtd)]
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[(rcd? parent)
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(error who "BUG1")]
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[else (error who "~s is not a valid record constructor descriptor"
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parent)]))
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(define (make-rcd/procedure-proto rtd parent protocol)
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(error who "BUG2"))
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(unless (rtd? rtd)
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(error who "~s is not an rtd" rtd))
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(cond
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[(not protocol)
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(make-rcd/default-proto rtd parent)]
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[(procedure? protocol)
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(make-rcd/procedure-proto rtd parent protocol)]
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[else (error who "~s is not a valid protocol" protocol)])))
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(define (iota i n)
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(if (= i n)
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'()
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(cons i (iota (+ i 1) n))))
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(define (sym n)
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(string->symbol (format "v~s" n)))
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(define (default-constructor-maker n)
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;;; FIXME: should cache compiled procedures
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(let ([vars (map sym (iota 0 n))])
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(eval `(lambda (rtd)
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(lambda ,vars
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($record rtd . ,vars)))
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(environment '(ikarus) '(ikarus system $records)))))
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(define (record-constructor rcd)
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(define who 'record-constructor)
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(unless (rcd? rcd)
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(error who "~s is not a record constructor descriptor" rcd))
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(let ([rtd (rcd-rtd rcd)]
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[pproc (rcd-pproc rcd)]
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[proc (rcd-proc rcd)])
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(cond
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[(not pproc)
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(cond
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[(not proc)
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((default-constructor-maker (rtd-size rtd)) rtd)]
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[else (error who "BUG")])]
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[else (error who "BUG")])))
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(define (record-accessor rtd k)
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(define who 'record-accessor)
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(unless (rtd? rtd)
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(error who "~s is not an rtd" rtd))
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(unless (and (fixnum? k) (fx>= k 0))
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(error who "~s is not a valid index" k))
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(let ([sz (rtd-size rtd)]
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[p (rtd-parent rtd)])
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(let ([i (if p (+ k (rtd-size p)) k)])
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(unless (fx< i sz)
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(error who "~s is not a valid index" k))
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(lambda (x)
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(cond
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[($record/rtd? x rtd) ($record-ref x i)]
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[($record? x)
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(let ([xrtd ($record-rtd x)])
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(unless (rtd? xrtd)
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(error who "~s is not of type ~s" x rtd))
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(let f ([prtd (rtd-parent xrtd)] [rtd rtd] [x x] [i i])
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(cond
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[(eq? prtd rtd) ($record-ref x i)]
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[(not prtd)
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(error who "~s is not of type ~s" x rtd)]
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[else (f (rtd-parent prtd) rtd x i)])))]
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[else (error who "~s is not of type ~s" x rtd)])))))
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(define (record-mutator rtd k)
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(define who 'record-mutator)
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(unless (rtd? rtd)
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(error who "~s is not an rtd" rtd))
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(unless (and (fixnum? k) (fx>= k 0))
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(error who "~s is not a valid index" k))
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(let ([sz (rtd-size rtd)]
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[p (rtd-parent rtd)])
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(let ([i (if p (+ k (rtd-size p)) k)])
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(unless (fx< i sz)
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(error who "~s is not a valid index" k))
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(unless (car (vector-ref (rtd-fields rtd) k))
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(error who "field ~s of ~s is not mutable" k rtd))
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(lambda (x v)
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(cond
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[($record/rtd? x rtd) ($record-set! x i v)]
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[($record? x)
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(let ([xrtd ($record-rtd x)])
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(unless (rtd? xrtd)
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(error who "~s is not of type ~s" x rtd))
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(let f ([prtd (rtd-parent xrtd)] [rtd rtd] [x x] [i i] [v v])
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(cond
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[(eq? prtd rtd) ($record-set! x i v)]
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[(not prtd)
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(error who "~s is not of type ~s" x rtd)]
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[else (f (rtd-parent prtd) rtd x i v)])))]
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[else (error who "~s is not of type ~s" x rtd)])))))
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(define (record-predicate rtd)
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(define who 'record-predicate)
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(unless (rtd? rtd)
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(error who "~s is not an rtd" rtd))
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(let ([sz (rtd-size rtd)]
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[p (rtd-parent rtd)])
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(lambda (x)
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(cond
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[($record/rtd? x rtd) #t]
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[($record? x)
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(let ([xrtd ($record-rtd x)])
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(and (rtd? xrtd)
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(let f ([prtd (rtd-parent xrtd)] [rtd rtd])
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(cond
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[(eq? prtd rtd) #t]
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[(not prtd) #f]
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[else (f (rtd-parent prtd) rtd)]))))]
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[else #f]))))
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)
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