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Adjusts the prompt handling so that it submits expressions that signal

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arbitrary read errors, but does not submit those that raise eof errors.
closes PR 11126
This commit is contained in:
Robby Findler 2010-08-24 13:45:53 -05:00
parent a4b0c69ec2
commit 5de6ff2ada
3 changed files with 18 additions and 11 deletions
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7
collects/framework/main.rkt
View File

@ -1327,10 +1327,13 @@
@scheme[end] in @scheme[text] has at least one complete s-expression and
there are no incomplete s-expressions. If
@scheme[end] is @scheme[#f], it defaults to the last position of the
@scheme[text].
@scheme[text]. The designation ``complete'' is defined to be something that does not
cause @racket[read] to raise a @racket[exn:fail:read:eof?] exception,
so there may be all kinds of strange read-level (not to speak of parse level)
errors in the expressions.
The implementation of this function creates a port with
@scheme[open-input-text-editor] and then uses `read' to parse the
@scheme[open-input-text-editor] and then uses @racket[read] to parse the
range of the buffer.})
(proc-doc/names

15
collects/framework/private/scheme.rkt
View File

@ -44,13 +44,16 @@
(let* ([end (or in-end (send text last-position))]
[port (open-input-text-editor text start end)])
(with-handlers ([exn:fail:read:eof? (λ (x) #f)]
[exn:fail:read? (λ (x) #f)])
[exn:fail:read? (λ (x) #t)])
(let ([first (read port)])
(and (not (eof-object? first))
(let loop ()
(let ([s (read port)])
(or (eof-object? s)
(loop))))))))))
(cond
[(eof-object? first) #f]
[else
(let loop ()
(let ([s (read port)])
(cond
[(eof-object? s) #t]
[else (loop)])))]))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;

7
collects/tests/framework/scheme.rkt
View File

@ -21,10 +21,11 @@
(test-text-balanced? 0 "" 0 #f #f)
(test-text-balanced? 1 " \n " 0 #f #f)
(test-text-balanced? 2 "foo)" 0 #f #f)
(test-text-balanced? 2 "foo)" 0 #f #t)
(test-text-balanced? 3 "(foo" 0 #f #f)
(test-text-balanced? 4 "(foo)" 0 #f #t)
(test-text-balanced? 5 "(foo 'bar))" 0 #f #f)
(test-text-balanced? 5 "(foo 'bar))" 0 #f #t)
(test-text-balanced? 6 "(foo) bar ([buz])" 0 #f #t)
(test-text-balanced? 7 "(foo]" 0 #f #f)
(test-text-balanced? 7 "(foo]" 0 #f #t)
(test-text-balanced? 8 "{foo} ((bar) [5.9])" 0 #f #t)
(test-text-balanced? 9 "#(1 2 . 3)" 0 #f #t)