66 lines
2.6 KiB
Scheme
66 lines
2.6 KiB
Scheme
#lang scheme/base
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(require (for-syntax scheme/base scheme/require-transform scheme/list
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"private/at-syntax.ss"))
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(provide matching-identifiers-in)
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(define-syntax matching-identifiers-in
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(make-require-transformer
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(lambda (stx)
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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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(define-values [imports sources] (expand-import #'spec))
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(values (filter (lambda (i)
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(regexp-match? rx (symbol->string
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(syntax-e (import-local-id i)))))
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imports)
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sources))]))))
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(provide subtract-in)
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(define-syntax subtract-in
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(make-require-transformer
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(lambda (stx)
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(syntax-case stx ()
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[(_ spec specs ...)
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(let* ([subs (map (lambda (spec)
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(let-values ([(imports srcs) (expand-import spec)])
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imports))
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(syntax->list #'(specs ...)))]
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[subs (map (lambda (i) (syntax-e (import-local-id i)))
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(apply append subs))])
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(define-values [imports sources] (expand-import #'spec))
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(values (filter (lambda (i)
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(not (memq (syntax-e (import-local-id i)) subs)))
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imports)
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sources))]))))
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(provide filtered-in)
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(define-syntax filtered-in
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(make-require-transformer
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(lambda (stx)
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(syntax-case stx ()
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[(_ proc spec)
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(let ([proc (at-syntax #'proc)])
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(define-values [imports sources] (expand-import #'spec))
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(values
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(filter-map
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(lambda (i)
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(let* ([id (import-local-id i)]
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[s1 (symbol->string (syntax-e id))]
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[s2 (proc s1)])
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(cond [(equal? s1 s2) i]
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[(string? s2) (make-import (datum->syntax
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id (string->symbol s2) id)
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(import-src-sym i)
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(import-src-mod-path i)
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(import-mode i)
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(import-req-mode i)
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(import-orig-mode i)
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(import-orig-stx i))]
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[(not s2) #f]
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[else (error 'filtered-in "bad result: ~e" s2)])))
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imports)
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sources))]))))
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