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branch and refactor simple functions. 

The refactor should be a macro but I don't know how to write those yet
(apparently there are different macros systems...  ooo la la!)
This commit is contained in:
sforman 2023-08-11 21:15:26 -07:00
parent 4d6d66e391
commit 172407fef1
1 changed files with 22 additions and 8 deletions
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30
implementations/scheme-chicken/joy.scm
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@ -45,24 +45,30 @@
(define (joy-eval symbol stack expression dict)
(define (is-it? name) (string=? symbol name))
(cond
((is-it? "+") (values (joy-add stack) expression dict))
((is-it? "-") (values (joy-sub stack) expression dict))
((is-it? "*") (values (joy-mul stack) expression dict))
((is-it? "mul") (values (joy-mul stack) expression dict))
((is-it? "+") ((joy-func +) stack expression dict))
((is-it? "-") ((joy-func -) stack expression dict))
((is-it? "*") ((joy-func *) stack expression dict))
((is-it? "mul") ((joy-func *) stack expression dict))
((is-it? "dup") (values (cons (car stack) stack) expression dict))
((is-it? "pop") (values (cdr stack) expression dict))
((is-it? "stack") (values (cons stack stack) expression dict))
((is-it? "swaack") (values (cons (cdr stack) (car stack)) expression dict))
((is-it? "swap") (values (cons (cadr stack) (cons (car stack) (cddr stack))) expression dict))
((is-it? "i") (joy-i stack expression dict))
((is-it? "dip") (joy-dip stack expression dict))
((is-it? "branch") (joy-branch stack expression dict))
((hash-table-exists? dict symbol)
(values stack (append (hash-table-ref dict symbol) expression) dict))
(else (error "Unknown word."))))
(define (joy-add stack) (cons (+ (cadr stack) (car stack)) (cddr stack)))
(define (joy-sub stack) (cons (- (cadr stack) (car stack)) (cddr stack)))
(define (joy-mul stack) (cons (* (cadr stack) (car stack)) (cddr stack)))
(define (joy-func op)
(lambda (stack expression dict)
(values (cons (op (cadr stack) (car stack)) (cddr stack)) expression dict)))
(define (joy-i stack expression dict)
(values (cdr stack) (append (car stack) expression) dict))
@ -72,6 +78,14 @@
(append (car stack) (cons (cadr stack) expression))
dict))
(define (joy-branch stack expression dict)
(let ((flag (caddr stack))
(false_body (cadr stack))
(true_body (car stack)))
(values (cdddr stack)
(append (if flag true_body false_body) expression)
dict)))
(define (string-replace str from to)
(string-intersperse (string-split str from #t) to))
@ -145,6 +159,6 @@
(hash-table-set! dict (car def_list) (cdr def_list))))
(display (doit "1 2 3 [4 5 6] dip"))
(display (doit "true [4] [5] branch false [4] [5] branch + sqr"))
(newline)