66 lines
2.2 KiB
Racket
66 lines
2.2 KiB
Racket
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(module old-rp '#%kernel
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(#%require (for-syntax '#%kernel racket/private/stx racket/private/small-scheme
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racket/private/stxcase-scheme))
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(#%provide require require-for-syntax require-for-template require-for-label
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provide provide-for-syntax provide-for-label)
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(begin-for-syntax
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(define-values (rebuild-elem)
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(lambda (stx elem sub pos loop ids)
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;; For sub-forms, we loop and reconstruct:
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(for-each (lambda (id)
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(unless (identifier? id)
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(raise-syntax-error
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#f
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"expected an identifier"
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stx
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id)))
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(syntax->list ids))
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(let rloop ([elem elem][pos pos])
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(if (syntax? elem)
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(datum->syntax elem
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(rloop (syntax-e elem) pos)
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elem
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elem)
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(if (zero? pos)
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(cons (loop (car elem))
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(cdr elem))
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(cons (car elem)
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(rloop (cdr elem) (sub1 pos)))))))))
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(define-syntaxes (require require-for-syntax require-for-template require-for-label)
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(let ([mk
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(lambda (for-stx)
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(lambda (stx)
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(syntax-case stx ()
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[(_ elem ...)
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(if for-stx
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(with-syntax ([for for-stx])
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(syntax/loc stx
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(#%require (for-meta for (just-meta 0 elem ...)))))
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(syntax/loc stx
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(#%require elem ...)))])))])
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(values (mk #f)
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(mk #'1)
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(mk #'-1)
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(mk #'#f))))
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(define-syntaxes (provide provide-for-syntax provide-for-label)
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(let ([mk
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(lambda (for-stx)
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(lambda (stx)
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(syntax-case stx ()
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[(_ elem ...)
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(if for-stx
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(with-syntax ([for for-stx])
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(syntax/loc stx
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(#%provide (for elem ...))))
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(syntax/loc stx
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(#%provide elem ...)))])))])
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(values (mk #f)
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(mk #'for-syntax)
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(mk #'for-label)))))
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