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syntax/parse: fix ~datum pattern with compound datum

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This commit is contained in:
Ryan Culpepper 2016-05-03 04:22:52 -04:00
parent 430e6e9567
commit 9d3c193bcf
3 changed files with 17 additions and 6 deletions
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4
pkgs/racket-test/tests/stxparse/test.rkt
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@ -641,3 +641,7 @@
(check-eq? (x) (void))
))
;; from Jay McCarthy (4/2016)
(tok (1 2 3) (~datum (1 2 3)) 'ok)
(tok (1 2 . 3) (~datum (1 2 . 3)) 'ok)
(tok (1 . (2 3)) (~datum (1 . (2 3))) 'ok)

12
racket/collects/syntax/parse/private/parse.rkt
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@ -545,10 +545,14 @@ Conventions:
k))))
argu))))]
[#s(pat:datum attrs datum)
#`(let ([d (if (syntax? x) (syntax-e x) x)])
(if (equal? d (quote datum))
k
(fail (failure pr (es-add-atom 'datum es)))))]
(with-syntax ([unwrap-x
(if (atomic-datum-stx? #'datum)
#'(if (syntax? x) (syntax-e x) x)
#'(syntax->datum (datum->syntax #f x)))])
#`(let ([d unwrap-x])
(if (equal? d (quote datum))
k
(fail (failure pr (es-add-atom 'datum es))))))]
[#s(pat:literal attrs literal input-phase lit-phase)
#`(if (and (identifier? x)
(free-identifier=? x (quote-syntax literal) input-phase lit-phase))

7
racket/collects/syntax/parse/private/rep.rkt
View File

@ -26,6 +26,9 @@
;; (mandatory from outside, at least)
(provide/contract
[atomic-datum-stx?
(-> syntax?
boolean?)]
[parse-rhs
(-> syntax? (or/c false/c (listof sattr?)) boolean?
#:context (or/c false/c syntax?)
@ -73,7 +76,7 @@
;; ----
(define (atomic-datum? stx)
(define (atomic-datum-stx? stx)
(let ([datum (syntax-e stx)])
(or (null? datum)
(boolean? datum)
@ -521,7 +524,7 @@
(identifier? #'id)
(parse-pat:id stx decls allow-head?)]
[datum
(atomic-datum? #'datum)
(atomic-datum-stx? #'datum)
(create-pat:datum (syntax->datum #'datum))]
[(~var . rest)
(disappeared! stx)