mirror of
https://github.com/justinethier/cyclone.git
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120 lines
4.9 KiB
Scheme
120 lines
4.9 KiB
Scheme
;; TODO: this does not work yet, need (begin) to be able to inject
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;; define's in its outer scope
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;;
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;;; This is based on the implementation of SRFI 9 from chibi scheme
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(define-library (srfi 9)
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(export
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define-record-type
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register-simple-type
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make-type-predicate
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make-constructor
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slot-set!
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type-slot-offset
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)
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(import (scheme base)
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(scheme cyclone util))
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(begin
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(define record-marker (list 'record-marker))
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(define (register-simple-type name parent field-tags)
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(let ((new (make-vector 3 #f)))
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(vector-set! new 0 record-marker)
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(vector-set! new 1 name)
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(vector-set! new 2 field-tags)
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new))
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(define (make-type-predicate pred name)
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(lambda (obj)
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(and (vector? obj)
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(equal? (vector-ref obj 0) record-marker)
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(equal? (vector-ref obj 1) name))))
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(define (make-constructor make name)
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(lambda ()
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(let* ((field-tags (vector-ref name 2))
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(new (make-vector (length field-tags) #f)))
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new)))
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(define (type-slot-offset name sym)
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(let ((field-tags (vector-ref name 2)))
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(list-index2 sym field-tags)))
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(define (slot-set! name obj idx val)
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(let ((vec obj)) ;; TODO: get actual slots from obj
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(vector-set! vec idx val)))
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(define-syntax define-record-type
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(er-macro-transformer
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(lambda (expr rename compare)
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(let* ((name+parent (cadr expr))
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(name (if (pair? name+parent) (car name+parent) name+parent))
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(parent (and (pair? name+parent) (cadr name+parent)))
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(name-str (symbol->string name)) ;(identifier->symbol name)))
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(procs (cddr expr))
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(make (caar procs))
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(make-fields (cdar procs))
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(pred (cadr procs))
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(fields (cddr procs))
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(_define (rename 'define))
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(_lambda (rename 'lambda))
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(_let (rename 'let))
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(_register (rename 'register-simple-type))
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(_slot-set! (rename 'slot-set!))
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(_type_slot_offset (rename 'type-slot-offset)))
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;; catch a common mistake
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(if (eq? name make)
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(error "same binding for record rtd and constructor" name))
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`(,(rename 'begin)
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;; type
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(,_define ,name (,_register
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,name ;,name-str
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,parent
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',(map car fields)))
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;; predicate
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(,_define ,pred (,(rename 'make-type-predicate)
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,pred ;(symbol->string pred) ;(identifier->symbol pred))
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,name))
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; ;; fields
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; ,@(map (lambda (f)
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; (and (pair? f) (pair? (cdr f))
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; `(,_define ,(cadr f)
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; (,(rename 'make-getter)
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; ,(symbol->string
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; (cadr f)
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; ;(identifier->symbol (cadr f))
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; )
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; ,name
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; (,_type_slot_offset ,name ',(car f))))))
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; fields)
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; ,@(map (lambda (f)
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; (and (pair? f) (pair? (cdr f)) (pair? (cddr f))
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; `(,_define ,(car (cddr f))
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; (,(rename 'make-setter)
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; ,(symbol->string
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; (car (cddr f))
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; ;(identifier->symbol (car (cddr f)))
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; )
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; ,name
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; (,_type_slot_offset ,name ',(car f))))))
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; fields)
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;; constructor
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(,_define ,make
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,(let lp ((ls make-fields) (sets '()))
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(cond
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((null? ls)
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`(,_let ((%make (,(rename 'make-constructor)
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,(symbol->string make) ;(identifier->symbol make))
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,name)))
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(,_lambda ,make-fields
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(,_let ((res (%make)))
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,@sets
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res))))
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(else
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(let ((field (assq (car ls) fields)))
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(cond
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((not field)
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(error "unknown record field in constructor" (car ls)))
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((pair? (cddr field))
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(lp (cdr ls)
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(cons `(,(car (cddr field)) res ,(car ls)) sets)))
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(else
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(lp (cdr ls)
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(cons `(,_slot-set! ,name res (,_type_slot_offset ,name ',(car ls)) ,(car ls))
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sets)))))))))
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)
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))))))
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