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start debug-define

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This commit is contained in:
Matthew Butterick 2016-03-20 09:22:55 -07:00
parent 7dd003deff
commit d93cb2c4ca
1 changed files with 25 additions and 3 deletions
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28
br/define.rkt
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@ -1,7 +1,25 @@
#lang racket/base
(require (for-syntax racket/base syntax/parse))
(require (for-syntax racket/base syntax/parse racket/syntax syntax/datum syntax/strip-context))
(provide (all-defined-out))
(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))
syntaxed-result))))]))
(define-syntax (br:define stx)
(define-syntax-class syntaxed-id
#:literals (syntax)
@ -12,8 +30,12 @@
#:literals (syntax)
[(_ (syntax (id pat-arg ... . rest-arg)) body ...) ; (define #'(foo arg) #'(+ arg arg))
#'(define-syntax id (λ (stx)
(syntax-case stx ()
[(_ pat-arg ... . rest-arg) body ...])))]
(define result
(syntax-case stx ()
[(_ pat-arg ... . rest-arg) body ...]))
(if (not (syntax? result))
(datum->syntax stx result)
result)))]
[(_ sid:syntaxed-id sid2:syntaxed-id) ; (define #'f1 #'f2)
#'(define-syntax sid.name (make-rename-transformer sid2))]