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add stx-append*-lens

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This commit is contained in:
Stephen Chang 2016-07-19 15:40:17 -04:00
parent e0f96296ed
commit e573a0927c
1 changed files with 13 additions and 2 deletions
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15
turnstile/append-lens.rkt
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@ -1,8 +1,8 @@
#lang racket/base
(provide append*-lens append*n-lens)
(provide append*-lens append*n-lens stx-append*-lens)
(require lens racket/match racket/list)
(require lens unstable/lens racket/match racket/list syntax/stx)
(module+ test
(require rackunit syntax/parse lens/private/test-util/test-lens))
@ -34,6 +34,17 @@
(define (append*n-lens n)
(apply lens-thrush (make-list n append*-lens)))
(define stx->lol-lens
(make-lens
(lambda (stx) (stx-map stx->list stx))
datum->syntax)) ; orig stx is 1st ctx arg
(define l->stx-lens
(make-lens
(lambda (x) x)
(lambda (l stx) (stx->list stx))))
(define stx-append*-lens
(lens-thrush stx->lol-lens append*-lens l->stx-lens))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(module+ test