forked from alex-eg/sex
alex-eg
42d58d3359
Introducing Sex SEMantic ENgine: the semen. Also split reader to other file (it can be replaced in the future). Macro expansion inside Sex code doesn't work yet, and it must be done in semen, not during fmt-c generation as before.
37 lines
789 B
Scheme
37 lines
789 B
Scheme
(declare (unit sex-macros))
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(import
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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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(import fmt)
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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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,@body)))
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(define (get-macro name)
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(eval (get name 'sex-macro)))
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(define (sex-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 (sex-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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