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add version of make-variable-like-transformer

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AlexKnauth 2015-09-21 17:54:25 -04:00
parent 0d43fd4683
commit 82b7ec004d
1 changed files with 16 additions and 1 deletions
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17
tapl/stx-utils.rkt
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@ -47,4 +47,19 @@
(define (stx-append stx1 stx2)
(append (if (syntax? stx1) (syntax->list stx1) stx1)
(if (syntax? stx2) (syntax->list stx2) stx2)))
(if (syntax? stx2) (syntax->list stx2) stx2)))
;; based on make-variable-like-transformer from syntax/transformer,
;; but using (#%app id ...) instead of ((#%expression id) ...)
(define (make-variable-like-transformer ref-stx)
(unless (syntax? ref-stx)
(raise-type-error 'make-variable-like-transformer "syntax?" ref-stx))
(lambda (stx)
(syntax-case stx ()
[id
(identifier? #'id)
ref-stx]
[(id . args)
(let ([stx* (list* '#%app #'id (cdr (syntax-e stx)))])
(datum->syntax stx stx* stx))])))