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https://github.com/justinethier/cyclone.git
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53 lines
1.6 KiB
Scheme
53 lines
1.6 KiB
Scheme
;(import (scheme eval) (scheme write))
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;
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;(eval '((lambda (expr rename compare) (cond ((null? (cdr expr)) #t) ((null? (cddr expr)) (cadr expr)) (else (list (rename (quote if)) (cadr expr) (cons (rename (quote and)) (cddr expr)) #f)))) '(test 1 2 3) (lambda (x) x) '()))
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;;;(eval '((lambda (x) x) 1))
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;
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;
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(import (scheme base)
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(test-lib test)
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(scheme eval)
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(scheme write))
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;(define-syntax test
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; (er-macro-transformer
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; (lambda (expr rename compare)
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; `((lambda ()
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; (write "testing")
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; (write (quote ,(cdr expr))))))))
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;
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; WTF is the macro unable to be evaluated when the same code works as part of *defined-macros*???
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;
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(define-syntax test
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(er-macro-transformer
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(lambda (expr rename compare)
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(cond ((null? (cdr expr)) #t)
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; (cond ((null? (cdr expr)))
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((null? (cddr expr)) (cadr expr))
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(else (list (rename 'if) (cadr expr)
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(cons (rename 'and) (cddr expr))
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#f))))))
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(define-syntax or
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(er-macro-transformer
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(lambda (expr rename compare)
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(cond ((null? (cdr expr)) #f)
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((null? (cddr expr)) (cadr expr))
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(else
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(list (rename 'let) (list (list (rename 'tmp) (cadr expr)))
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(list (rename 'if) (rename 'tmp)
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(rename 'tmp)
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(cons (rename 'or) (cddr expr)))))))))
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(write (test 1 2 3))
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(write (my-or 1 2 3 'or))
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(write (my-or #f 2 3 'or))
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;(test 'done)
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'done
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(define x 1)
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(write x)
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(write
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(eval 'my-or))
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(write
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(eval '(my-or 1 2 x)))
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