27 lines
1.0 KiB
Scheme
27 lines
1.0 KiB
Scheme
(module collapsed-snipclass-helpers mzscheme
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(require mred
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mzlib/class)
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(provide make-sexp-snipclass%)
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(define (make-sexp-snipclass% sexp-snip%)
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(class snip-class%
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(define/override (read in)
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(let* ([left-bracket (integer->char (bytes-ref (send in get-bytes) 0))]
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[right-bracket (integer->char (bytes-ref (send in get-bytes) 0))]
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[snip-count (send in get-exact)]
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[saved-snips
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(let loop ([n snip-count])
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(cond
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[(zero? n) null]
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[else
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(let* ([classname (bytes->string/utf-8 (send in get-bytes))]
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[snipclass (send (get-the-snip-class-list) find classname)])
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(cons (send snipclass read in)
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(loop (- n 1))))]))])
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(instantiate sexp-snip% ()
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(left-bracket left-bracket)
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(right-bracket right-bracket)
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(saved-snips saved-snips))))
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(super-instantiate ()))))
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