33 lines
1 KiB
Scheme
33 lines
1 KiB
Scheme
;;; Ported from Scheme 48 1.9. See file COPYING for notices and license.
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;;;
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;;; Port Author: Andrew Whatson
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;;;
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;;; Original Authors: Mike Sperber
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;;;
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;;; scheme48-1.9.2/scheme/rts/low-syntax.scm
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;;;
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;;; Low-level support for different kinds of syntax transformers
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;;;
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;;; We just use a vector with a tag in slot 0. (Can't be a pair,
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;;; because syntax transformers may be pairs of transformer and aux
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;;; names.)
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;;;
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;;; 4-argument version of explicit-renaming transformers
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;;; (expression name? rename compare)
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(define-module (prescheme bcomp transform4)
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#:export (make-explicit-renaming-transformer/4
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explicit-renaming-transformer/4?
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explicit-renaming-transformer/4-proc))
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(define (make-explicit-renaming-transformer/4 proc)
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(vector 'explicit-renaming-transformer/4 proc))
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(define (explicit-renaming-transformer/4? thing)
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(and (vector? thing)
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(= 2 (vector-length thing))
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(eq? 'explicit-renaming-transformer/4 (vector-ref thing 0))))
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(define (explicit-renaming-transformer/4-proc thing)
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(vector-ref thing 1))
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