46 lines
1010 B
Scheme
46 lines
1010 B
Scheme
(module macros
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(register-macro
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cat
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get-macro
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macro?
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apply-macro
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defmacro)
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(import
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scheme
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(only fmt fmt)
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(chicken base)
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(chicken plist)
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(chicken string))
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(define (cat-syms s-1 s-2)
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(fmt #f s-1 s-2))
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(define (cat sym-1 sym-2)
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(string->symbol (cat-syms sym-1 sym-2)))
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(define (register-macro name arglist body)
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(put! name 'sex-macro
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`(lambda ,arglist
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(import scheme
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(only macros cat))
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,@body)))
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(define (get-macro name)
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(eval (get name 'sex-macro)))
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(define (macro? form)
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(and (list? form)
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(symbol? (car form))
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(get (car form) 'sex-macro)))
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(define (apply-macro form)
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(assert (macro? form)
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(fmt #f (car form) " is not a macro"))
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(apply (get-macro (car form))
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(cdr form)))
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(define (defmacro form)
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(let ((arglist (car form))
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(body (cdr form)))
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(register-macro (car arglist) (cdr arglist) body))))
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