88 lines
5.1 KiB
Plaintext
88 lines
5.1 KiB
Plaintext
#!/usr/bin/env newlisp
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(define cont list)
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(define cont? list?)
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;(define cont (lambda (l) (array (length l) l)))
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;(define cont? array?)
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(define (evaluate_case access c) (cond
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((and (list? c) (= 2 (length c)) (= 'unquote (c 0))) (list (list = access (c 1)) (lambda (b) b)))
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((symbol? c) (list true (expand (lambda (b) (list let (list 'c 'access) b)) 'c 'access)))
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((list? c) (letn (
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tests (list and (list list? access) (list = (length c) (list length access)))
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tests__body_func (local (recurse) (setq recurse (lambda (tests body_func i) (if (= i (length c))
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(list tests body_func)
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(letn ( inner_test__inner_body_func (evaluate_case (list access i) (c i))
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inner_test (inner_test__inner_body_func 0)
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inner_body_func (inner_test__inner_body_func 1)
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)
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(recurse (append tests (list inner_test))
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(expand (lambda (b) (body_func (inner_body_func b))) 'body_func 'inner_body_func)
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(+ i 1))))))
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(recurse tests (lambda (b) b) 0))
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) tests__body_func))
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(true (list (list = access c) (lambda (b) b)))
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))
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(define (my-match-helper x_sym cases i) (cond ((< i (- (length cases) 1)) (let (test__body_func (evaluate_case x_sym (cases i)))
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(append (list (list (test__body_func 0) ((test__body_func 1) (cases (+ i 1))))) (my-match-helper x_sym cases (+ i 2)))))
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(true '((true ("none matched"))))))
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(macro (my-match X) X)
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(constant 'my-match (lambda-macro (X) (expand (list let (list '__MATCH_SYM 'X) (cons cond (my-match-helper '__MATCH_SYM (args) 0))) 'X)))
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(define (mk-expr n v) (cond ((= n 0) (cond ((= v 0) (list 'VR 1 0))
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(true (list 'VL v 0))))
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(true (list 'A (mk-expr (- n 1) (+ v 1)) (mk-expr (- n 1) (max (- v 1) 0))))))
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(define (append-add a b) (my-match a
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('A c d) (list 'A c (append-add d b))
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a (list 'A a b)))
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(define (append-mul a b) (my-match a
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('M c d) (list 'M c (append-mul d b))
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a (list 'M a b)))
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(define (reassoc e) (my-match e
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('A a b) (append-add (reassoc a) (reassoc b))
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('M c d) (append-mul (reassoc a) (reassoc b))
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e e))
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(define (cfoldD e) (my-match e
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('A a b) (letn (ap (cfoldD a)
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bp (cfoldD b))
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(my-match ap
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('VL s t) (my-match bp
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('VL m n) (list 'VL (+ s m) 0)
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('A m ('VL n p)) (list 'A (list 'VL (+ s n) 0) m)
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('A ('VL m n) p) (list 'A (list 'VL (+ s m) 0) p)
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ep (list 'A ap bp)
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)
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ep (list 'A ap bp)
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)
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)
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('M c d) (letn (cp (cfoldD c)
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dp (cfoldD dec))
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(my-match cp
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('VL s t) (my-match dp
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('VL m n) (list 'VL (* s m) 0)
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('M m ('VL n p)) (list 'M (list 'VL (* s n) 0) m)
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('M ('VL m n) p) (list 'M (list 'VL (* s m) 0) p)
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ep (list 'M cp dp)
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)
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ep (list 'M ap bp)
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)
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)
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e e))
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(define (evalD e) (my-match e
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('VR a b) 0
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('VL c d) c
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('A e f) (+ (evalD e) (evalD f))
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('M l r) (* (evalD l) (evalD r))))
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(println (evalD (cfoldD (reassoc (mk-expr (integer (main-args 2)) 1)))))
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(exit)
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