Re: Detecting the Eu version
Juergen Luethje wrote:
>
> Dear EUforum members to whom it may concern:
>
> Please don't change the Subject of a thread
> (unless there is an *important* reason)!
>
> My e-mail client (and many other clients, too) allows to sort messages
> by Subject, that makes it much easier to read this mailing list.
> Also, RDS had built a useful feature into the EUforum web interface:
> After clicking at the Subject of a message, you'll get the whole thread.
> Even if you are not interested in these possibilities yourself, other
> people here find them useful, so do not destroy them!
>
> -> I changed "(no subject)" back to "Detecting the Eu version".
Agreed. I usually only change the subject title when a thread forks to a
different subject but then I put something like [was: whatever].
> However, starting with Eu 2.5, the problem has changed. A version()
> function -- builtin or not -- wouldn't solve the problem any more. For
> the Eu 2.5 interpreter (as it currently is) *there is no other way than
> crashing*, when it will try to run source code that contains keywords
> which were introduced in Eu 2.6 or later.
> Whatever code you write in order to try to solve this problem, your
> code will never be executed, because the program crashes beforehand.
>
> This has been discussed previously in this thread. So it might be a
> good moment now for some people, to test the cool feature that I
> mentioned above: On the EUforum web interface, click at the subject,
> and read the whole thread ...
Right. I understood this and tried to clarify it for people who didn't.
So you would do this...
> > Euphoria is small enough, I think, to include the required interpreter
> > and files to users. Also, binding or translating would work. For open
> > source, you would just distribute a source tree like any other
> > (executable) project would.
> > The real problem, of course, comes in distributing libraries that you
> > don't want to work only for the lowest common denominator. Libraries
> > are the code that need to check versions somewhat reliably so they can
> > give a meaningful message to the user of the library.
>
> Right!
>
> > (Of course, if the library user would read the docs...)
>
> Are we talking about a low-level or a high-level language?
> If Euphoria is a high-level language, then it should for instance say
> something like:
>
> Sorry, code in "thisprog.e" requires Euphoria version 2.5 or later.
>
> Rather than:
>
> syntax error - expected to see an expression, not an
> illegal character
> s = s[2..$]
> ^
> Regards,
> Juergen
Obviously this would be the *best* solution. I don't have much hope for its
implementation.
The 'with 2.5' or whatever would have to be executed before the entire program
is parsed. It would have to be a compiler directive. Versions prior to 2.5
might still break as mentioned earlier in the thread but we would at least solve
the problem for future versions.
> --
> Have you read a good program lately?
>
>
=====================================
Too many freaks, not enough circuses.
j.
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