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; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Richard Kelsey, Mike Sperber
(define-usual-macro 'syntax-rules
(make-explicit-renaming-transformer/4
(lambda (exp name? r c)
(let ((%quote (r 'quote))
(%cons (r 'cons))
(%make-explicit-renaming-transformer/4 (r 'make-explicit-renaming-transformer/4)))
(if (pair? (cdr exp))
(let ((subkeywords (cadr exp))
(rules (cddr exp)))
(if (and (list? subkeywords)
(every name? subkeywords))
(receive (code inserted)
(process-rules exp name? r c)
(if code
`(,%cons (,%make-explicit-renaming-transformer/4 ,code)
(,%quote ,inserted)) ; should this be code-quote?
exp))
exp))
exp))))
'(cons lambda code-quote make-explicit-renaming-transformer/4 apply-rules))
(define (process-rules exp name? r c)
(let ((%quote (r 'quote))
(%code-quote (r 'code-quote))
(%cons (r 'cons))
(%lambda (r 'lambda))
(%apply-rules (r 'apply-rules))
(%input (r 'input))
(%name? (r 'name?))
(%rename (r 'rename))
(%compare (r 'compare)))
(receive (compiled inserted)
(compile-rules exp
(lambda (n)
(and (name? n)
(c n (r '...)))))
(if compiled
(values `(,%lambda (,%input ,%name? ,%rename ,%compare)
(,%apply-rules ,%input
(,%code-quote ,compiled)
,%name?
,%rename
,%compare))
inserted)
(values #f #f)))))
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