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better code organization

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svn: r15152
This commit is contained in:
Eli Barzilay 2009-06-12 14:33:22 +00:00
parent e53fa0ce2b
commit 81d8c97800
1 changed files with 21 additions and 25 deletions
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46
collects/syntax/module-reader.ss
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@ -26,7 +26,7 @@
...
[else (err "got an unknown keyword" (car body))])))))
checks ...
(set! var (or var default)) ...))
(unless var (set! var default)) ...))
(define (construct-reader lang body)
(keywords body
[#:language ~lang lang]
@ -45,30 +45,26 @@
(quasisyntax/loc stx
(#%module-begin
#,@body
(#%provide (rename *read read) (rename *read-syntax read-syntax))
(define-values (*read *read-syntax)
(let* ([lang #,~lang]
[rd #,~read]
[rds #,~read-syntax]
[w1 #,~wrapper1]
[w2 #,~wrapper2]
[w2 (cond [(not w2) (lambda (in r _) (r in))]
[(procedure-arity-includes? w2 3) w2]
[else (lambda (in r _) (w2 in r))])]
[whole? #,~whole-body-readers?])
(values
(lambda (in modpath line col pos)
(w2 in
(lambda (in)
(wrap-internal lang in rd whole?
w1 #f modpath #f line col pos))
#f))
(lambda (src in modpath line col pos)
(w2 in
(lambda (in)
(wrap-internal lang in (lambda (in) (rds src in)) whole?
w1 #t modpath src line col pos))
#t))))))))
(#%provide (rename lang:read read) (rename lang:read-syntax read-syntax))
(define lang #,~lang)
(define rd #,~read)
(define rds #,~read-syntax)
(define w1 #,~wrapper1)
(define w2 #,~wrapper2)
(define w2* (cond [(not w2) (lambda (in r _) (r in))]
[(procedure-arity-includes? w2 3) w2]
[else (lambda (in r _) (w2 in r))]))
(define whole? #,~whole-body-readers?)
(define (lang:read in modpath line col pos)
(w2* in (lambda (in)
(wrap-internal lang in rd whole?
w1 #f modpath #f line col pos))
#f))
(define (lang:read-syntax src in modpath line col pos)
(w2* in (lambda (in)
(wrap-internal lang in (lambda (in) (rds src in)) whole?
w1 #t modpath src line col pos))
#t)))))
(syntax-case stx ()
[(_ lang body ...)
(not (keyword? (syntax-e #'lang)))