cyclone/test2.scm
2015-08-26 19:15:45 -04:00

88 lines
2.6 KiB
Scheme

;(import (scheme eval) (scheme write))
;
;(eval '((lambda (expr rename compare) (cond ((null? (cdr expr)) #t) ((null? (cddr expr)) (cadr expr)) (else (list (rename (quote if)) (cadr expr) (cons (rename (quote and)) (cddr expr)) #f)))) '(test 1 2 3) (lambda (x) x) '()))
;;;(eval '((lambda (x) x) 1))
;
;
(import (scheme base)
;(test-lib test)
(scheme eval)
(scheme write))
(define-syntax swap!
(er-macro-transformer
(lambda (form rename compare?)
(let (
(x (cadr form))
(y (caddr form))
(%tmp (rename 'tmp))
(%let (rename 'let))
(%set! (rename 'set!))
)
`(,%let ((,%tmp ,x))
(,%set! ,x ,y)
(,%set! ,y ,%tmp))))))
(define x 'x)
(define y 'y)
(write `(,x ,y))
(swap! x y)
(write `(,x ,y))
(define tmp 'tmp)
(define y 'y)
(write `(,tmp ,y))
(swap! tmp y)
(write `(,tmp ,y))
;(define-syntax test
; (er-macro-transformer
; (lambda (expr rename compare)
; `((lambda ()
; (write "testing")
; (write (quote ,(cdr expr))))))))
;
; WTF is the macro unable to be evaluated when the same code works as part of *defined-macros*???
;
;(define-syntax test
; (er-macro-transformer
; (lambda (expr rename compare)
; (cond ((null? (cdr expr)) #t)
;; (cond ((null? (cdr expr)))
; ((null? (cddr expr)) (cadr expr))
; (else (list (rename 'if) (cadr expr)
; (cons (rename 'and) (cddr expr))
; #f))))))
;
;(define-syntax test2
; (er-macro-transformer
; (lambda (expr rename compare)
; ;; need some way to get these in the eval env
; ;;
; ;; may need to maintain an environment in the compiler and pass it
; ;; along to eval somehow when macro is expanded. would this just
; ;; involve changes to expand? also, does that mean macro:expand
; ;; should call eval directly if a non-compiled macro is found?
; ;; if that is the case, macro:expand would also need to receive
; ;; the env parameter so it could pass that along to.
; ;; tbd how this parameter would be combined with eval's global env,
; ;; because it would need to extend it.
; ;; could eval expose a function to extend the global env (or any env)?
; (test 1 2 3)
; (test 1 2 3) ; breaks
; (my-or 1 2 3) ; breaks
; (and ''test ''test2))))
;
;(write (test2 1 2 3))
;(write (test 1 2 3))
;(write (my-or 1 2 3 'or))
;(write (my-or #f 2 3 'or))
;;(test 'done)
;'done
;
;(define x 1)
;(write x)
;(write
; (eval 'my-or))
;(write
; (eval '(my-or x 1 2 x)))