Re: Jython 2.7.0 final released!

Oops the hybrid should have been:

raise_stmt: 'raise' [test ['from' test][',' test [',' test]]]

On Fri, May 8, 2015 at 4:31 PM, [email protected]
<[email protected]> wrote:
> On Fri, May 8, 2015 at 5:41 AM, Stefan Richthofer
> <[email protected]> wrote:
>>>>grammar to keep 2.7 and 3.5 sort of parsing at the same time
>>
>> I had no idea this would be actually possible, but it sounds
>> very interesting. Did you consider this as an actual feature
>> for Jython3?
> What might make sense someday if I have time would be conditional
> parsing of either with the same grammar. Actually parsing at the same
> time creates terrible things (and I am perpetrating terrible things
> for now).
>
> For example, raise_stmt in Python2 is (from CPython's Grammar) looks like:
> raise_stmt: 'raise' [test [',' test [',' test]]]
>
> Python3's is:
> raise_stmt: 'raise' [test ['from' test]]
>
> What I am doing would translate to:
> raise_stmt: 'raise' [test ['from'][',' test [',' test]]]
>
> Which would allow horrors like:
>
> raise Exception from None, foo, bar
>
>> Did you consider this as an actual feature
>> for Jython3? Parsing 2.7 and 3.5 at the same time sounds weired,
>> but what about something like a new import directive, let's say
>> "import2" to import code that is known to be Python 2.7?
> This would take much more than a conditional grammar, we'd have to
> somehow keep two runtimes around and be able to mix them. We'd need
> things like sometimes old style classes are permitted, sometimes not,
> etc. That's definitely too hard (at least for me) and probably way too
> ugly. Although it is the sort of crazy thing that can sometimes
> interests Jim :)
>
> -Frank

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