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82 lines
1.4 KiB
Scheme
82 lines
1.4 KiB
Scheme
;;
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;; common functions for capone
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;;
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(define first car)
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(define rest cdr)
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;;
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;; Allow defining functions like:
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;; (def name (param1 param2)
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;; ...
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;; )
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(define-macro (def name . rest)
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;; name - function name
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;; (car rest) - function params
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;; (cdr rest)- function body
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`(define ,(cons name (car rest))
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,@(cdr rest)))
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;;
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;; Flexible printing e.g.:
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;; (define num 3)
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;; (print "This number is: " num "\n")
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;;
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(define (print arg . rest)
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(display arg)
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(let loop ((rest rest))
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(if (not (null? rest))
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(begin
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(display (car rest))
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(loop (cdr rest))))))
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;;
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;; (print) with newline
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;;
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(define-macro (println . body)
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`(print ,@body "\n"))
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;;
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;; while loop macro; used like:
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;; (while (> a 2)
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;; ...
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;; )
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;;
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(define-macro (while . body)
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`(let loop ()
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;; fetch condition
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(if ,(car body)
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(begin
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;; evaluate body
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,@(cdr body)
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(loop)))))
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;;
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;; A python-like 'for' loop, works only on lists, like:
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;; (for i in '(1 2 3 4 5)
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;; (print "Number is " i "\n")
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;; )
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(define-macro (for . expr)
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;; (car expr) is 'i'
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;; (caddr expr) is list
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;; (cdddr expr) is body
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(let* (( lst (gensym) ))
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`(let (( ,lst ,(caddr expr) ))
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(cond
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((list? ,lst)
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(map (lambda (,(car expr))
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,@(cdddr expr))
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,lst))
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(else
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(throw "Unsupported type in 'for' loop"))))))
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;;
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;; iota function; returns a list of numbers
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;;
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(define (iota n)
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(let loop ((n n)
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(lst '()))
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(if (= n 0)
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lst
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(loop (- n 1) (cons n lst)))))
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