Re: Jython 2.7.0 final released!

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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