OpenEuphoria

Re: Attn:[Daryl Border]

• Posted by Daryl Border <Darylb5 at aol.com> Apr 29, 2005
• 512 views

Vincent wrote:
> 
> Daryl,
> 
> I just got around to voting on your "Updated PD Interpreter Source Files";
> great job on it, the global conflict resolution works great with VEEU. As you
> already
> know, there was a small bug I had to fix to get it to work
> without random failure:

Thank you, maybe it will motivate me to finish some other projects I've started.

> 
> }}}
<eucode>
> -- symtab.e
> if length(dup_globals) > 1 and sequence(include_paths[current_file_no]) then
> ...
> ...
> </eucode>
{{{

> 
> I'm not sure how that fixed the problem with dup_globals not reading
> as a sequence with PD source, dup_globals should always be a sequence, because
> it's
> defined as sequence type: "global sequence dup_globals",
> but w/e :S.

I don't think it was dup_globals that was the problem. It was
include_paths[current_file_no].
The problem starts with the way I add a new element to include_paths as new
files are
included. I used include_paths &= 0. This starts each include path as an integer
zero.
Normally when the parser processes a include statement, that file's file number
and path
are appended to the zero changing it to a sequence. What I didn't consider was a
situation
where a programmer references a global variable, but doesn't use any include
statements. Under
those circumstances, the integer isn't changed to a sequence causing the crash.
I see three ways to fix the bug. 
1 use your fix which works fine.
2 fix the bug at the source by changing line 370 of scanner.e from 
   include_paths &= 0  to include_paths = append(include_paths, {}).
this will assure that each element is always a sequence and also eliminate
   the zeros saving
   a little space.
3 take advantage of the bug to provide a custom error message reminding the
programmer to use
  include statements in their files.
Which would you prefer?

> 
> If you like, you could fix that line in symtab.e and update the
> contrubution, though it may not matter to much now.
> 
> 
> Regards,
> Vincent
> 
> --
> Without walls and fences, there is no need for Windows and Gates.
> 

Thanks again, Daryl