[racket-dev] [plt] Push #20578: master branch updated

It should be set by the 'configure-runtime thunk (from
module->language-info), right?

(I'm not sure about the bug, tho.)

Robby

On Sat, Jun 26, 2010 at 8:47 AM, Jay McCarthy <jay.mccarthy at gmail.com> wrote:
> Just using the core of even-read didn't work. It would start to read
> after parse-statement had returned and then my parser would just sit
> there because the port wasn't returning EOF. I think it is a bug.
>
> Jay
>
> On Fri, Jun 25, 2010 at 10:44 PM, Eli Barzilay <eli at barzilay.org> wrote:
>> On Jun 26, jay at racket-lang.org wrote:
>>> +  ; XXX This is almost certainly wrong.
>>> +  (define (even-read src ip)
>>> +    (begin0
>>> +      (parameterize ([current-source-name src])
>>> +       (datum->syntax #f (parse-statement ip)))
>>> +      (current-read-interaction odd-read)))
>>> +  (define (odd-read src ip)
>>> +    (current-read-interaction even-read)
>>> +    eof)
>>> +
>>> +  (current-read-interaction
>>> +   even-read))
>>
>> This is not just wrong -- it is likely to break things randomly.
>> Something like -- if you happen to invoke the datalog reader
>> indirectly (like just `read' a file in the language), you'd end up
>> with one of these readers as a side-effect.  This is exactly how the
>> scribble/text language messed things up in a very confusing way: by
>> banging `current-print' to do its own thing.
>>
>> --
>>          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
>>                    http://barzilay.org/                   Maze is Life!
>>
>
>
>
> --
> Jay McCarthy <jay at cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://teammccarthy.org/jay
>
> "The glory of God is Intelligence" - D&C 93
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