38 lines
1.4 KiB
Scheme
38 lines
1.4 KiB
Scheme
#lang scheme/base
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(require (for-syntax scheme/base scheme/provide-transform scheme/list
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(only-in unstable/syntax syntax-local-eval)))
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(provide matching-identifiers-out)
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(define-syntax matching-identifiers-out
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(make-provide-transformer
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(lambda (stx modes)
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(syntax-case stx ()
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[(_ rx spec)
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(regexp? (syntax-e #'rx))
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(let ([rx (syntax-e #'rx)])
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(filter (lambda (e)
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(regexp-match? rx (symbol->string (export-out-sym e))))
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(expand-export #'spec modes)))]))))
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(provide filtered-out)
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(define-syntax filtered-out
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(make-provide-transformer
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(lambda (stx modes)
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(syntax-case stx ()
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[(_ proc spec)
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(let ([proc (syntax-local-eval #'proc)])
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(filter-map
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(lambda (e)
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(let* ([s1 (symbol->string (export-out-sym e))]
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[s2 (proc s1)])
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(cond [(equal? s1 s2) e]
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[(string? s2) (make-export (export-local-id e)
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(string->symbol s2)
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(export-mode e)
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(export-protect? e)
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(export-orig-stx e))]
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[(not s2) #f]
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[else (error 'filtered-out "bad result: ~e" s2)])))
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(expand-export #'spec modes)))]))))
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