suzanne.soy/scribble-enhanced
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scribble/eval: fix evaluation of literal #f expression

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Fixed part of PR 11790

original commit: ae8705611ba3ff03ed208aa5c590e8cfc52a36a6
This commit is contained in:
Matthew Flatt 2011-03-11 07:52:16 -06:00
parent c33146745d
commit 67888f2c2c
1 changed files with 8 additions and 3 deletions
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11
collects/scribble/eval.rkt
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@ -183,6 +183,9 @@
(cdr val-list+outputs)
#f)))))))
;; extracts from a datum or syntax object --- while keeping the
;; syntax-objectness of the original intact, instead of always
;; generating a syntax object or always generating a datum
(define (extract s . ops)
(let loop ([s s][ops ops])
(cond
@ -190,13 +193,15 @@
[(syntax? s) (loop (syntax-e s) ops)]
[else (loop ((car ops) s) (cdr ops))])))
(struct nothing-to-eval ())
(define (extract-to-evaluate s)
(let loop ([s s][expect #f])
(syntax-case s (code:comment eval:alts eval:check)
[(code:line v (code:comment . rest))
(loop (extract s cdr car) expect)]
[(code:comment . rest)
(values #f expect)]
(values (nothing-to-eval) expect)]
[(eval:alts p e)
(loop (extract s cdr cdr car) expect)]
[(eval:check e expect)
@ -207,7 +212,7 @@
(define ((do-eval ev) s)
(let-values ([(s expect) (extract-to-evaluate s)])
(if s
(if (not (nothing-to-eval? s))
(let ([r (with-handlers ([(lambda (x)
(not (exn:break? x)))
(lambda (e)
@ -392,7 +397,7 @@
(define (do-interaction-eval ev e)
(let-values ([(e expect) (extract-to-evaluate e)])
(when e
(unless (nothing-to-eval? e)
(parameterize ([current-command-line-arguments #()])
(do-plain-eval (or ev (make-base-eval)) e #f)))
""))