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record-alambda-macro.scm
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;;; define-record-lambda --- define-macro
;;; The implementation below requires SRFI-23 and SRFI-187.
(define err-str "define-record-lambda: invisible or immutable field")
(define-macro (unquote-get symbol args)
(define (lp args)
(if (null? args)
`(error err-str ,symbol)
(let ((arg (car args)))
(if (pair? arg)
`(if (eq? ,symbol ',(car arg))
,(cadr arg)
,(lp (cdr args)))
`(if (eq? ,symbol ',arg)
,arg
,(lp (cdr args)))))))
(lp args))
;; (define-macro (unquote-get symbol args)
;; (if (null? args)
;; `(error err-str ,symbol)
;; (let ((arg (car args)))
;; (if (pair? arg)
;; `(if (eq? ,symbol ',(car arg))
;; ,(cadr arg)
;; (unquote-get ,symbol ,(cdr args)))
;; `(if (eq? ,symbol ',arg)
;; ,arg
;; (unquote-get ,symbol ,(cdr args)))))))
(define-macro (unquote-set! symbol new-val args)
(define (lp args)
(if (null? args)
`(error err-str ,symbol)
(let ((arg (car args)))
`(if (eq? ,symbol ',arg)
(set! ,arg ,new-val)
,(lp (cdr args))))))
(lp args))
(define (check-duplicate ls err-str)
(cond ((null? ls) #f)
((memq (car ls) (cdr ls)) (error err-str (car ls)))
(else (check-duplicate (cdr ls) err-str))))
(define (number-alist ls)
(let loop ((ls ls) (n 0))
(if (null? ls)
'()
(cons (cons (car ls) n) (loop (cdr ls) (+ 1 n))))))
(define-macro (define-lambda name fm fi c r o a h i v)
(let ((arg (gensym))
;; (val (gensym))
(args (gensym))
(maker (gensym))
(maker/s (gensym))
(v-all (gensym))
(name-alist-m (gensym))
(name-alist-a (gensym))
(num-m (gensym))
(num-a (gensym))
(safe (gensym))
(unique-name (gensym))
(nm-str (symbol->string name)))
(let ((make-record (string->symbol (string-append "make-" nm-str)))
(make-record-by-name (string->symbol (string-append "make-" nm-str "-by-name")))
(make-record/s (string->symbol (string-append "make-" nm-str "/s")))
(make-record-by-name/s (string->symbol (string-append "make-" nm-str "-by-name/s")))
(pred-record (string->symbol (string-append nm-str "?")))
(name-fm (map (lambda (x) (string->symbol (string-append nm-str "-" (symbol->string x)))) fm))
(name-fi (map (lambda (x) (string->symbol (string-append nm-str "-" (symbol->string x)))) (map car fi))))
`(begin
;; A vector or list can be used instead of unquote-get & unquote-set!.
;; cf. (eval-variant expression implementation-specific-namespace)
(define ,name-alist-a (number-alist ',(append name-fm name-fi)))
(define ,name-alist-m (number-alist ',name-fm))
(define ,num-a (length ,name-alist-a))
(define ,num-m (length ,name-alist-m))
,@(map (lambda (f) `(define ,f (cdr (assq ',f ,name-alist-a)))) name-fi)
,@(map (lambda (f) `(define ,f (cdr (assq ',f ,name-alist-m)))) name-fm)
;; You can choose a suitable constructor.
;; 1. number
(define ,maker
(let* ,(map cdr c)
(cons (alambda (,@(map cadr r) () ,@(map cdr o))
(let* ,(map cdr a)
(define ,unique-name
(if (and (null? ',c) (null? ',o) (null? ',a) (null? ',v))
(let ((,v-all (vector ,@fm ,@(map cadr fi))))
(cond
((null? ',fi)
;; (case-lambda
;; ((,arg) (vector-ref ,v-all ,arg))
;; ((,arg ,val) (vector-set! ,v-all ,arg ,val))))
(lambda (,arg . ,args)
(if (null? ,args)
(vector-ref ,v-all ,arg)
(vector-set! ,v-all ,arg (car ,args)))))
((null? ',fm)
(lambda (,arg) (vector-ref ,v-all ,arg)))
(else
;; (case-lambda
;; ((,arg) (vector-ref ,v-all ,arg))
;; ((,arg ,val) (if (< ,arg ,num-m)
;; (vector-set! ,v-all ,arg ,val)
;; (error err-str ,arg)))))))
(lambda (,arg . ,args)
(if (null? ,args)
(vector-ref ,v-all ,arg)
(if (< ,arg ,num-m)
(vector-set! ,v-all ,arg (car ,args))
(error err-str ,arg)))))))
(let ((,v-all (vector ,@(map (lambda (f) `(lambda (,safe) (if (eq? ,safe ',unique-name) ,f (set! ,f ,safe)))) fm) ,@(map (lambda (f) `(lambda (,safe) (if (eq? ,safe ',unique-name) ,f (error ,err-str)))) (map cadr fi)))))
;; (case-lambda
;; ((,arg) ((vector-ref ,v-all ,arg) ',unique-name))
;; ((,arg ,val) ((vector-ref ,v-all ,arg) ,val))))))
(lambda (,arg . ,args)
(if (null? ,args)
((vector-ref ,v-all ,arg) ',unique-name)
((vector-ref ,v-all ,arg) (car ,args)))))))
,unique-name))
(alambda (,@(map cadr r) () ,@(map (lambda (ntv) `((',(cadr ntv) ',(car ntv)) ,(caddr ntv))) o))
(let* ,(map cdr a)
(define ,unique-name
(if (and (null? ',c) (null? ',o) (null? ',a) (null? ',v))
(let ((,v-all (vector ,@fm ,@(map cadr fi))))
(cond
((null? ',fi)
;; (case-lambda
;; ((,arg) (vector-ref ,v-all ,arg))
;; ((,arg ,val) (vector-set! ,v-all ,arg ,val))))
(lambda (,arg . ,args)
(if (null? ,args)
(vector-ref ,v-all ,arg)
(vector-set! ,v-all ,arg (car ,args)))))
((null? ',fm)
(lambda (,arg) (vector-ref ,v-all ,arg)))
(else
;; (case-lambda
;; ((,arg) (vector-ref ,v-all ,arg))
;; ((,arg ,val) (if (< ,arg ,num-m)
;; (vector-set! ,v-all ,arg ,val)
;; (error err-str ,arg)))))))
(lambda (,arg . ,args)
(if (null? ,args)
(vector-ref ,v-all ,arg)
(if (< ,arg ,num-m)
(vector-set! ,v-all ,arg (car ,args))
(error err-str ,arg)))))))
(let ((,v-all (vector ,@(map (lambda (f) `(lambda (,safe) (if (eq? ,safe ',unique-name) ,f (set! ,f ,safe)))) fm) ,@(map (lambda (f) `(lambda (,safe) (if (eq? ,safe ',unique-name) ,f (error ,err-str)))) (map cadr fi)))))
;; (case-lambda
;; ((,arg) ((vector-ref ,v-all ,arg) ',unique-name))
;; ((,arg ,val) ((vector-ref ,v-all ,arg) ,val))))))
(lambda (,arg . ,args)
(if (null? ,args)
((vector-ref ,v-all ,arg) ',unique-name)
((vector-ref ,v-all ,arg) (car ,args)))))))
,unique-name)))))
(define ,make-record (car ,maker))
(define ,make-record-by-name (cdr ,maker))
;; 2. symbol
(define ,maker/s
(let* ,(map cdr c)
(cons (alambda (,@(map cadr r) () ,@(map cdr o))
(let* ,(map cdr a)
(define ,unique-name
;; (case-lambda
;; ((,arg) (unquote-get ,arg ,(append (map list fm fm) fi)))
;; ((,arg ,val) (unquote-set! ,arg ,val ,fm))))
(lambda (,arg . ,args)
(if (null? ,args)
(unquote-get ,arg ,(append (map list fm fm) fi))
(unquote-set! ,arg (car ,args) ,fm))))
,unique-name))
(alambda (,@(map cadr r) () ,@(map (lambda (ntv) `((',(cadr ntv) ',(car ntv)) ,(caddr ntv))) o))
(let* ,(map cdr a)
(define ,unique-name
;; (case-lambda
;; ((,arg) (unquote-get ,arg ,(append (map list fm fm) fi)))
;; ((,arg ,val) (unquote-set! ,arg ,val ,fm))))
(lambda (,arg . ,args)
(if (null? ,args)
(unquote-get ,arg ,(append (map list fm fm) fi))
(unquote-set! ,arg (car ,args) ,fm))))
,unique-name)))))
(define ,make-record/s (car ,maker/s))
(define ,make-record-by-name/s (cdr ,maker/s))
;; The predicate procedure is implementation dependant.
;; A procedure such as `object-name' is necessary for this to work.
(define (,pred-record record) ;racket
(eq? ',unique-name (object-name record)))
(define ,name
(let ((constructor `(,,maker ,,maker/s))
(predicate ,pred-record)
(field `((total (read-write-field ,',fm)
(read-only-field ,',(map car fi))
(invisible-field ,',(map car h)))
(types (common-field ,',(map car c))
(required-field ,',(map car r))
(optional-field ,',(map car o))
(automatic-field ,',(append (map car a) (map car v)))
(immutable-field ,',(map car i))
(invisible-field ,',(map car h))
(virtual-field ,',(map car v)))))
(index ,name-alist-a))
(check-duplicate ',(append fm (map car fi) (map car h))
"define-record-lambda: duplicated field")
(lambda (sym)
(unquote-get sym (constructor predicate field index)))))))))
(define-macro (define-record-lambda name . field)
(define (field-sort field fm fi c r o a h i v)
(if (null? field)
`(define-lambda ,name ,fm ,fi ,c ,r ,o ,a ,h ,i ,v)
(let ((vars (car field)))
(if (symbol? vars) ;r
(if (and (null? o) (null? a) (null? v))
(field-sort (cdr field)
fm (append fi (list (list vars vars)))
c (append r (list (list vars vars))) o a h i v)
(error "define-record-lambda: required-field should precede optional-field and automatic-field" vars))
(let ((var (car vars)))
(if (symbol? var)
(if (null? (cdr vars)) ;(r)
(if (and (null? o) (null? a) (null? v))
(field-sort (cdr field)
(append fm vars) fi
c (append r (list (list (car vars) (car vars)))) o a h i v)
(error "define-record-lambda: required-field should precede optional-field and automatic-field" var))
(if (null? (cddr vars)) ;(var val)
(if (and (null? a) (null? v))
(cond
((eq? 'quasiquote var)
(if (null? o) ;`r
(let ((rva (cadr vars)))
(field-sort (cdr field)
fm fi
c (append r (list (list rva rva))) o a (append h (list (list rva rva))) i v))
(error "define-record-lambda: required-field should precede optional-field" var)))
((eq? 'quote var)
(if (null? o) ;'r
(let ((t (gensym)) (rva (cadr vars)))
(field-sort (cdr field)
fm (append fi (list (list rva t)))
c (append r (list (list rva t))) o a h (append i (list (list rva rva))) v))
(error "define-record-lambda: required-field should precede optional-field" var)))
(else ;(o val)
(field-sort (cdr field)
fm (append fi (list (list var var)))
c r (append o (list (cons var vars))) a h i v)))
(error "define-record-lambda: required-field and optional-field should precede automatic-field" var))
(error "define-record-lambda: incorrect syntax" vars)))
(if (and (pair? (cdr vars)) (null? (cddr vars)))
(let ((b (car var)))
(if (symbol? b)
(if (null? (cdr var)) ;((o) val)
(if (and (null? a) (null? v))
(field-sort (cdr field)
(append fm var) fi
c r (append o (list (list b b (cadr vars)))) a h i v)
(error "define-record-lambda: optional-field should precede automatic-field" b))
(if (null? (cddr var))
(let ((d (cadr var)))
(cond
((symbol? d)
(cond
((eq? 'unquote b) ;(,a val)
(field-sort (cdr field)
fm (append fi (list (list d d)))
c r o (append a (list (list d d (cadr vars)))) h i v))
((eq? 'quasiquote b) ;(`o val)
(if (and (null? a) (null? v))
(field-sort (cdr field)
fm fi
c r (append o (list (list d d (cadr vars)))) a (append h (list (cons d (cdr vars)))) i v)
(error "define-record-lambda: optional-field should precede automatic-field" d)))
((eq? 'quote b) ;('o val)
(if (and (null? a) (null? v))
(let ((t (gensym)))
(field-sort (cdr field)
fm (append fi (list (list d t)))
c r (append o (list (list d t (cadr vars)))) a h (append i (list (cons d (cdr vars)))) v))
(error "define-record-lambda: optional-field should precede automatic-field" d)))
((eq? 'unquote-splicing b) ;(,@c val)
(if (and (null? r) (null? o) (null? a) (null? v))
(field-sort (cdr field)
fm (append fi (list (list d d))) (append c (list (list d d (cadr vars)))) r o a h i v)
(error "define-record-lambda: common-field should precede all the other fields" d)))
(else
(error "define-record-lambda: incorrect syntax" vars))))
((and (eq? 'unquote (car d)) (null? (cddr d)))
(if (symbol? (cadr d))
(cond
((eq? 'quasiquote b) ;(`,a val)
(field-sort (cdr field)
fm fi
c r o (append a (list (list (cadr d) (cadr d) (cadr vars)))) (append h (list (cons (cadr d) (cdr vars)))) i v))
((eq? 'quote b) ;(',a val)
(let ((t (gensym)))
(field-sort (cdr field)
fm (append fi (list (list (cadr d) t)))
c r o (append a (list (list (cadr d) t (cadr vars)))) h (append i (list (cons (cadr d) (cdr vars)))) v)))
((eq? 'unquote b) ;(,,a val)
(field-sort (cdr field)
fm (append fi (list (cons (cadr d) (cdr vars))))
c r o a h i (append v (list (cons (cadr d) (cdr vars))))))
(else
(error "define-record-lambda: incorrect syntax" vars)))
(error "define-record-lambda: incorrect syntax" vars)))
((and (eq? 'unquote-splicing (car d)) (null? (cddr d)))
(if (symbol? (cadr d))
(cond
((eq? 'quasiquote b) ;(`,@c val)
(if (and (null? r) (null? o) (null? a) (null? v))
(field-sort (cdr field)
fm fi
(append c (list (list (cadr d) (cadr d) (cadr vars)))) r o a (append h (list (cons (cadr d) (cdr vars)))) i v)
(error "define-record-lambda: common-field should precede all the other fields" (cadr d))))
((eq? 'quote b) ;(',@c val)
(if (and (null? r) (null? o) (null? a) (null? v))
(let ((t (gensym)))
(field-sort (cdr field)
fm (append fi (list (list (cadr d) t)))
(append c (list (list (cadr d) t (cadr vars)))) r o a h (append i (list (cons (cadr d) (cdr vars)))) v))
(error "define-record-lambda: common-field should precede all the other fields" (cadr d))))
(else
(error "define-record-lambda: incorrect syntax" vars)))
(error "define-record-lambda: incorrect syntax" vars)))
(else
(error "define-record-lambda: incorrect syntax" vars))))
(error "define-record-lambda: incorrect syntax" vars)))
(if (and (null? (cdr var)) (null? (cddr b)))
(cond
((and (eq? 'unquote (car b)) (symbol? (cadr b))) ;((,a) val)
(field-sort (cdr field)
(append fm (cdr b)) fi
c r o (append a (list (list (cadr b) (cadr b) (cadr vars)))) h i v))
((and (eq? 'unquote-splicing (car b)) (symbol? (cadr b))) ;((,@c) val)
(if (and (null? r) (null? o) (null? a) (null? v))
(field-sort (cdr field)
(append fm (cdr b)) fi
(append c (list (list (cadr b) (cadr b) (cadr vars)))) r o a h i v)
(error "define-record-lambda: common-field should precede all the other fields" (cadr b))))
(else
(error "define-record-lambda: incorrect syntax" vars)))
(error "define-record-lambda: incorrect syntax" vars))))
(error "define-record-lambda: incorrect syntax" vars))))))))
(field-sort field '() '() '() '() '() '() '() '() '()))
;;; eof