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use the module name resolver to check if the language is valid

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svn: r10542
This commit is contained in:
Eli Barzilay 2008-07-01 19:04:00 +00:00
parent bf2fe2f64c
commit b097856a72
1 changed files with 13 additions and 3 deletions
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16
collects/drscheme/private/module-language.ss
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@ -469,12 +469,22 @@
[lang-only (with-handlers ([void (λ (e) #f)])
(expand lang-only))])
(if lang-only
(let ([rep (drscheme:rep:current-rep)])
(begin
((error-display-handler) (exn-message exn) exn)
;; probably best to not say anything here
;; (send rep insert-warning "Definitions not in effect")
;; (send (drscheme:rep:current-rep) insert-warning
;; "Definitions not in effect")
lang-only)
(raise-hopeless-exception exn "invalid language specification"))))
;; say that it's an invalid language only if it doesn't resolve
;; properly, because the language can be fine but throw a syntax
;; error when there are no body expressions (for example, the
;; syntax/module-reader language)
(raise-hopeless-exception
exn
(with-handlers ([void (lambda (_)
"invalid language specification")])
((current-module-name-resolver) 'scheme #f #f)
#f)))))
;; Expand the module expression, so we can catch an syntax errors and
;; provide a repl with the base language in that case.
(define expr* (with-handlers ([exn? only-language]) (expand expr)))