38 lines
1.2 KiB
Racket
38 lines
1.2 KiB
Racket
#lang racket/base
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(require syntax/module-reader
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(only-in "../private/readtable.rkt" make-2d-readtable))
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(provide (rename-out [2d-read read]
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[2d-read-syntax read-syntax]
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[2d-get-info get-info]))
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(define (wrap-reader p)
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(lambda args
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(parameterize ([current-readtable (make-2d-readtable)])
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(apply p args))))
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(define-values (2d-read 2d-read-syntax 2d-get-info)
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(make-meta-reader
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'2d
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"language path"
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(lambda (bstr)
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(let* ([str (bytes->string/latin-1 bstr)]
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[sym (string->symbol str)])
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(and (module-path? sym)
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(vector
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;; try submod first:
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`(submod ,sym reader)
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;; fall back to /lang/reader:
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(string->symbol (string-append str "/lang/reader"))))))
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wrap-reader
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wrap-reader
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(lambda (proc)
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(lambda (key defval)
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(case key
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[(color-lexer)
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(define theirs
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(or (and proc (proc key #f))
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(dynamic-require 'syntax-color/racket-lexer 'racket-lexer)))
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((dynamic-require '2d/lexer '2d-lexer) theirs)]
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[else (if proc (proc key defval) defval)])))))
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