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;;;"yasyn.scm" YASOS in terms of "object.scm"
;;; Author: Wade Humeniuk <humeniuw@cadvision.com>
;;;
;;; This code is in the public domain.
(require 'object)
(require 'object->string)
;; (define yasos:make-instance 'bogus)
(define yasos:instance? object?)
(define (pormat dest arg)
(define obj (if (yasos:instance? arg) "#<INSTANCE>" arg))
(cond ((eqv? dest #t) (display obj))
(dest (display obj dest))
((yasos:instance? arg) obj)
(else (object->string arg))))
;@
(define add-setter 'bogus)
(define remove-setter-for 'bogus)
;@
(define setter
(let ( (known-setters (list (cons car set-car!)
(cons cdr set-cdr!)
(cons vector-ref vector-set!)
(cons string-ref string-set!))
)
(added-setters '())
)
(set! add-setter
(lambda (getter setter)
(set! added-setters (cons (cons getter setter) added-setters)))
)
(set! remove-setter-for
(lambda (getter)
(cond
((null? added-setters)
(slib:error 'remove-setter-for 'unknown-getter getter)
)
((eq? getter (caar added-setters))
(set! added-setters (cdr added-setters))
)
(else
(let loop ((x added-setters) (y (cdr added-setters)))
(cond
((null? y) (slib:error 'remove-setter-for 'unknown-getter
getter))
((eq? getter (caar y)) (set-cdr! x (cdr y)))
(else (loop (cdr x) (cdr y)))
) ) )
) ) )
(letrec ( (self
(lambda (proc-or-operation)
(cond ((assq proc-or-operation known-setters) => cdr)
((assq proc-or-operation added-setters) => cdr)
(else (proc-or-operation self))) )
) )
self)
) )
(define (yasos:make-access-operation <name>)
(letrec ( (setter-dispatch
(lambda (inst . args)
(cond
((and (yasos:instance? inst)
(get-method inst setter-dispatch))
=> (lambda (method) (apply method (cons inst args)))
)
(else #f)))
)
(self
(lambda (inst . args)
(cond
((eq? inst yasos:setter) setter-dispatch) ; for (setter self)
((and (yasos:instance? inst)
(get-method inst self))
=> (lambda (method) (apply method (cons inst args)))
)
(else (slib:error 'operation-not-handled <name> inst))
) )
)
)
self
) )
;;---------------------
;; general operations
;;---------------------
;;; if an instance does not have a PRINT operation..
;;(define-operation (yasos:print obj port) (pormat port obj) )
;@
(define print
(make-generic-method
(lambda (obj!2 port!2)
(pormat port!2 obj!2))))
;;; default behavior
;;(define-operation (yasos:size obj)
;; (cond ((vector? obj) (vector-length obj))
;; ((list? obj) (length obj))
;; ((pair? obj) 2)
;; ((string? obj) (string-length obj))
;; ((char? obj) 1)
;; (else (slib:error "Operation not supported: size" obj))))
;@
(define size
(make-generic-method
(lambda (obj!2)
(cond ((vector? obj!2) (vector-length obj!2))
((list? obj!2) (length obj!2))
((pair? obj!2) 2)
((string? obj!2) (string-length obj!2))
((char? obj!2) 1)
(else (slib:error 'size "Operation not supported" obj!2))))))
;;; internal aliases:
;;(define yasos:size size)
(define yasos:setter setter)
;; (define-syntax YASOS:INSTANCE-DISPATCHER
;; ;; alias so compiler can inline for speed
;; (syntax-rules () ((yasos:instance-dispatcher inst) (cdr inst))))
;; DEFINE-OPERATION
;@
(define-syntax define-operation
(syntax-rules ()
((define-operation (<name> <inst> <arg> ...) <exp1> <exp2> ...)
;;=>
(define <name> (make-generic-method
(lambda (<inst> <arg> ...) <exp1> <exp2> ...))))
((define-operation (<name> <inst> <arg> ...) ) ;; no body
;;=>
(define-operation (<name> <inst> <arg> ...)
(slib:error 'operation-not-handled
'<name>
(if (yasos:instance? <inst>) "#<INSTANCE>" <inst>))))))
;; DEFINE-PREDICATE
;@
(define-syntax define-predicate
(syntax-rules ()
((define-predicate <name>)
;;=>
(define <name> (make-generic-predicate)))))
;; OBJECT
;@
(define-syntax object
(syntax-rules ()
((object ((<name> <self> <arg> ...) <exp1> <exp2> ...) ...)
;;=>
(let ((self (make-object)))
(make-method! self <name> (lambda (<self> <arg> ...) <exp1> <exp2> ...))
...
self))))
;; OBJECT with MULTIPLE INHERITANCE {First Found Rule}
;@
(define-syntax object-with-ancestors
(syntax-rules ()
((object-with-ancestors ( (<ancestor1> <init1>) ... )
((<name> <self> <arg> ...) <exp1> <exp2> ...) ...)
;;=>
(let* ((<ancestor1> <init1>)
...
(self (make-object <ancestor1> ...)))
(make-method! self <name> (lambda (<self> <arg> ...) <exp1> <exp2> ...))
...
self))))
;; OPERATE-AS {a.k.a. send-to-super}
; used in operations/methods
;@
(define-syntax operate-as
(syntax-rules ()
((operate-as <component> <op> <composit> <arg> ...) ;; What is <composit> ???
;;=>
((get-method <component> <op>) <composit> <arg> ...))))
;; SET & SETTER
;@
(define-syntax set
(syntax-rules ()
((set (<access> <index> ...) <newval>)
((yasos:setter <access>) <index> ... <newval>)
)
((set <var> <newval>)
(set! <var> <newval>)
)
) )
;@
(define-syntax define-access-operation
(syntax-rules ()
((define-access-operation <name>)
;=>
(define <name> (yasos:make-access-operation '<name>))
) ) )
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