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This commit is contained in:
Matthew Butterick 2016-03-20 10:11:47 -07:00
parent d93cb2c4ca
commit f3b176025e
1 changed files with 15 additions and 10 deletions
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25
br/define.rkt
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@ -2,22 +2,27 @@
(require (for-syntax racket/base syntax/parse racket/syntax syntax/datum syntax/strip-context))
(provide (all-defined-out))
;; a little tricky because we have to mix two levels of macrology.
;; does not work with ellipses in the input pattern
(define-syntax (br:debug-define stx)
(syntax-parse stx
#:literals (syntax)
[(_ (syntax (id pat-arg ... . rest-arg)) body-exp) ; (define #'(foo arg) #'(+ arg arg))
#'(define-syntax id (λ (stx)
(define result (syntax-case stx ()
[(_ pat-arg ... . rest-arg) body-exp]))
(with-syntax ([syntaxed-result result]
[context stx])
#`(begin
(displayln (format "input pattern = #'~a" (quote (id pat-arg ... . rest-arg))))
(displayln (format "output pattern = #'~a" (syntax->datum body-exp)))
(displayln (format "arg ~a = ~a" (quote pat-arg) 'zz)) ...
#;(displayln stx)
(displayln (format "expansion = ~a" 'syntaxed-result))
(displayln (format "result = ~a" syntaxed-result))
[(_ pat-arg ... . rest-arg)
body-exp]))
(define arg-printing (syntax-case stx ()
[(_ pat-arg ... . rest-arg)
#`(begin
(displayln (format "arg #'~a = ~a" #,''pat-arg pat-arg)) ...)]))
(with-syntax ([syntaxed-arg-printing arg-printing]
[syntaxed-result result])
#'(begin
(displayln (format "input syntax = #'~a" (quote (id pat-arg ... . rest-arg))))
(displayln (format "output syntax = #'~a" (syntax->datum body-exp)))
syntaxed-arg-printing
(displayln (format "expanded syntax = #'~a" 'syntaxed-result))
syntaxed-result))))]))
(define-syntax (br:define stx)