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Remove global stack, dict. 

Pass them through the recursive loop instead.
This commit is contained in:
sforman 2023-10-10 11:16:30 -07:00
parent 937f6bfce5
commit 4df31667b6
1 changed files with 7 additions and 15 deletions
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22
implementations/scheme-chicken/joy.scm
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@ -248,26 +248,18 @@
(define (prompt) (display "joy? ") (read-line))
(define DICTIONARY (initialize))
(define STACK '())
(define (doit text)
(receive (stack dict) (joy STACK (text->expression text) DICTIONARY)
(set! DICTIONARY dict)
(set! STACK stack)
(joy-expression->string (reverse stack))))
(define (main-loop)
(define (main-loop stack0 dict0)
(let ((text (prompt)))
(if (not (string=? text ""))
((print (doit text)) (main-loop))
(else))))
(if (not (eof-object? text))
(receive (stack dict) (joy stack0 (text->expression text) dict0)
(print (joy-expression->string (reverse stack)))
(main-loop stack dict))
(print))))
(define (joy-trace stack expression)
(print (conc (joy-expression->string (reverse stack)) " . " (joy-expression->string expression))))
(main-loop)
(main-loop '() (initialize))
;(display (doit "5 [] cons [4] concat first"))