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do factoring for stxclasses (non-splicing only) too

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This commit is contained in:
Ryan Culpepper 2013-02-28 15:55:11 -05:00
parent 1de7045dd3
commit d5068278f4
1 changed files with 25 additions and 26 deletions
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51
collects/syntax/parse/private/parse.rkt
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@ -294,30 +294,29 @@ Conventions:
pr es success cp0 commit?)
;; Special case: no variants
#'(fail (failure pr es))]
[(parse:variants x cx relsattrs (variant ...) #t transparent?
pr es success cp0 commit?)
(with-syntax ([(#s(variant _ _ pattern (def ...)) ...) #'(variant ...)])
#'(let ()
def ... ...
(try (parse:H x cx rest-x rest-cx rest-pr pattern pr es
(variant-success relsattrs variant
(rest-x
rest-cx
(if 'transparent? rest-pr (ps-pop-opaque rest-pr)))
success cp0 commit?))
...)))]
[(parse:variants x cx relsattrs (variant ...) splicing? transparent?
pr es success cp0 commit?)
#'(try (parse:variant x cx relsattrs variant splicing? transparent?
pr es success cp0 commit?) ...)]))
;; (parse:variant x cx relsattrs variant splicing? pr es success cp0) : expr[Ans]
(define-syntax (parse:variant stx)
(syntax-case stx ()
[(parse:variant x cx relsattrs variant #f _ pr es success cp0 commit?)
(with-syntax ([#s(variant _ _ pattern (def ...)) #'variant])
#`(let ()
def ...
(parse:S x cx pattern pr es
(variant-success relsattrs variant
()
success cp0 commit?))))]
[(parse:variant x cx relsattrs variant #t transparent? pr es success cp0 commit?)
(with-syntax ([#s(variant _ _ pattern (def ...)) #'variant])
#`(let ()
def ...
(parse:H x cx rest-x rest-cx rest-pr pattern pr es
(variant-success relsattrs variant
(rest-x rest-cx (if 'transparent? rest-pr (ps-pop-opaque rest-pr)))
success cp0 commit?))))]))
(with-syntax ([(#s(variant _ _ pattern (def ...)) ...) #'(variant ...)])
#'(let ()
def ... ...
(parse:S* ((x cx pr es))
((pattern) ...)
((variant-success relsattrs variant
()
success cp0 commit?)
...))))]))
;; (variant-success relsattrs variant (also:id ...) success bool) : expr[Ans]
(define-syntax (variant-success stx)
@ -459,7 +458,7 @@ Conventions:
;; First pattern in each row is pat:pair
(with-syntax ([((#s(pat:pair _ head tail) . row) ...) #'rows]
[((x cx pr es) . ins) #'ins])
(when #f
(when #t
(when (> (length (syntax->list #'rows)) 1)
(eprintf "** pairs\n")))
#'(let-values ([(datum tcx)
@ -484,7 +483,7 @@ Conventions:
(with-syntax ([((pat1 . row) ...) #'rows]
[((x cx pr es) . ins) #'ins])
(with-syntax ([pat1 (stx-car #'(pat1 ...))])
(when #f
(when #t
(when (> (length (syntax->list #'rows)) 1)
(eprintf "** same: ~e\n" (syntax->datum #'pat1))))
#'(parse:S x cx pat1 pr es (parse:S* ins (row ...) ks))))]))
@ -529,7 +528,7 @@ Conventions:
(lambda (x)
(pattern-equal? pat1 x))
(lambda (x)
(when #f
(when #t
(when (pattern-equal? pat1 x)
(eprintf "** cannot factor out ~e\n" (syntax->datum x))))
#f)))]))
@ -689,7 +688,7 @@ Conventions:
(pattern-equal? (ehpat-head a) (ehpat-head b)))]
;; FIXME: more?
[else #f])))
(when #f
(when #t
(when (and (equal? (syntax->datum a) (syntax->datum b))
(eq? result #f))
(eprintf "** pattern-equal? failed on ~e\n" (syntax->datum a))))