mirror of
https://github.com/justinethier/cyclone.git
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70 lines
1.7 KiB
Scheme
70 lines
1.7 KiB
Scheme
(import (scheme base) (scheme write) (scheme cyclone pretty-print))
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(let-syntax
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((my-or (syntax-rules ()
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((my-or) #f)
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((my-or e) e)
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((my-or e1 e2 ...)
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(let ((temp e1)) (if temp temp (my-or e2 ...)))))))
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(let ((x #f)
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(y 7)
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(temp 8)
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(my-let odd?)
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(my-if even?))
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(my-or x (my-let temp) (my-if y) y))) ;; ==> 7
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#;(letrec-syntax
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((my-or (syntax-rules ()
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((my-or) #f)
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((my-or e) e)
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((my-or e1 e2 ...)
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(let ((temp e1)) (if temp temp (my-or e2 ...)))))))
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(let ((x #f)
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(y 7)
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(temp 8)
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(let odd?)
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(if even?))
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(my-or x (let temp) (if y) y))) ;; ==> 7
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(define-syntax my-let
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(syntax-rules
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()
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((my-let ((name val) ...) body1 body2 ...)
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((lambda (name ...) body1 body2 ...) val ...))
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((my-let tag ((name val) ...) body1 body2 ...)
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((letrec ((tag (lambda (name ...) body1 body2 ...)))
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tag)
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val ...))))
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(write
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(my-let ((x 'outer))
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(let-syntax ((m (syntax-rules () ((m) x))))
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(my-let ((x 'inner))
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(m)))) ;; Should be outer
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)
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;; (let-syntax ((given-that (syntax-rules ()
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;; ((given-that test stmt1 stmt2 ...)
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;; (if test
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;; (begin stmt1
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;; stmt2 ...))))))
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;; (let ((if #t))
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;; (given-that if (set! if 'now))
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;; if)) ;; => now
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(write
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(let ((x 'outer))
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(let-syntax ((m (syntax-rules () ((m) x))))
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(let ((x 'inner))
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(m)))) ;; Should be outer
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)
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;(write
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;(let ((x 'outer))
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; (define-syntax m ;; Testing this out, but let-syntax needs to work, too
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; (syntax-rules () ((m) x)))
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; (let ((x 'inner))
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; (m))) ;; Should be outer
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; )
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;
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;(write (m)) ;; Should be an error, of course
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