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String literals, better error reporting and some R5RS mechanics implemented.

This commit is contained in:
Jon Michael Aanes 2018-12-13 00:20:20 +01:00
parent edadfea781
commit 344746cc64
2 changed files with 620 additions and 231 deletions

View File

@ -1,4 +1,52 @@
;;; Standard lib, in scheme
; Lists
;
(define (foldl f i l)
(if (null? l)
i
(foldl f (f (car l) i) (cdr l))))
(define (foldr f i l)
(if (null? l)
i
(f (car l) (foldr f i (cdr l)))))
(define (map f l)
(if (null? l)
'()
(foldr (lambda (e a) (cons (f e) a)) '() l)))
(define (length l)
(foldl + 0 (map (lambda (x) 1) l)))
(define (reverse l)
(foldl cons '() l))
(define list-tail; Taken from https://people.csail.mit.edu/jaffer/r5rs/Pairs-and-lists.html
(lambda (x k)
(if (zero? k)
x
(list-tail (cdr x) (- k 1)))))
; Math
(define (zero? x) (= x 0))
(define (positive? x) (> x 0))
(define (negative? x) (< x 0))
(define (odd? x) (= (mod x 2) 1))
(define (even? x) (= (mod x 2) 0))
; Test string
(display "Hello World") (newline)
; Test functions
(define add-three (lambda (x y z) (+ (+ x z) y)))
@ -31,6 +79,70 @@
(set! x 10)
(display x) (newline)
(newline)
(display "* R5RS: Testing numerical operators *")
(newline)
(display "Testing number?\n\tExpect: #t #f #f #f\n\tGotten: ")
(display (number? 5))
(display " ")
(display (number? #f))
(display " ")
(display (number? "hello"))
(display " ")
(display (number? '(1 2)))
(newline)
(newline)
(display "* R5RS: Testing fold and map *")
(newline)
(display "Testing sum over foldl!\n\tExpect: 28\n\tGotten: ")
(display (foldl + 0 '(1 2 3 4 5 6 7)))
(newline)
(display "Testing sum over foldr!\n\tExpect: 28\n\tGotten: ")
(display (foldr + 0 '(1 2 3 4 5 6 7)))
(newline)
(display "Testing map!\n\tExpect: (21 22 23)\n\tGotten: ")
(display (map (lambda (a) (+ 20 a)) '(1 2 3)))
(newline)
(display "Testing length!\n\tExpect: 13\n\tGotten: ")
(display (length '(1 2 3 1 2 3 1 2 3 1 2 3 1)))
(newline)
(display "Testing length!\n\tExpect: (5 4 3 2 1)\n\tGotten: ")
(display (reverse '(1 2 3 4 5)))
(newline)
; Test environment set
(newline)
(display "* Testing custom library *")
(newline)
(display "Testing set-env! Expect 32: ")
(display ((set-env! (lambda () x) '((x . 32)) )))
(newline)
(display "Testing string->datum! Expect (2): ")
(display (cdr (string->datum "(display 2)")))
(newline)
(newline)
(display "* Testing Eval system *")
(newline)
(display "Eval expression. Expect 6: ")
(display (eval '(* 2 (cdr '(2 . 3))) (scheme-report-environment 5)))
(newline)
(newline)
(display "* Testing Macro system *")
(newline)
; Test syntax-rules
(define-syntax and

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