[PD] [PD-announce] pd 0.43-1 test7 (!) available

Hans-Christoph Steiner hans at at.or.at
Wed Dec 28 07:08:02 CET 2011

That is definitely true.  It is possible to make pd-gui execute line-by-line by setting the buffering on the socket to be per-newline, then reintroducing the logic that used to be in the C code.  But I think its faster to have Tcl parse, compile, and execute the code in larger blocks, but I don't have any data to back that up.


On Dec 27, 2011, at 1:37 PM, Miller Puckette wrote:

> I believe the difference between 0.42 and 0.43 is that the C code in 0.42
> actually spat each 'line' of TCL, separately, to the interpreter, whereas
> in 0.43 entire batches of TCL script get fed to the interpreter as a block.
> The 0.42 code wasn't airtight (checked for newlines at which {'s were
> balanced with }'s - this happened to work for all the TCL that Pd generated,
> but one could construct valid tcl code that gave false positives.)  So I'm
> not in favor of 'fixing' 0.43 to work like 0.42 in this aspect.  But I sure
> would like to be able to tell the interpreter to bull through if any individual
> statement failed - it won't fix any bugs but could make it less catastrophic
> when they manifest themselves.
> cheers
> Miller
>> The 'catch' is already in place in Pd 0.43 in pd_connect::pd_readsocket, and that is indeed what is printing out the Tcl error dump that started this discussion.  
>> As for whether pd-gui stops working after an error or not, I think this is a behavior of the Tcl interpreter, not Pd 0.43 or Pd 0.42.  In both Pd 0.42 and 0.43, fatal errors stop the Tcl interpreter.  Try sending a message with "{" in it.  In both Pd 0.42 and 0.43, the Tcl interpreter will print an error message for non-fatal errors and then continue to execute the next commands.  
>> About the bug report, that particular bug report shows a bug where Tcl commands are being split in the middle of the line, causing incomplete commands to be executed. The Tcl error dump that Cyrille posted in this thread is not the same error at all.  Cyrille's error shows a complete Tcl command, but the ".x235b3d0.c "canvas does not exist.  So Cyrille's error is like the errors that are triggered by the christchurch GOP that were fixed for 0.43-1test7.
>> On Sat, Dec 24, 2011 at 11:08:54PM +0100, cyrille henry wrote:
>>> when starting a patch using few GOP, i've got :
>>> (Tcl) INVALID COMMAND NAME: invalid command name ".x235b3d0.c"
>>>   while executing
>>> ".x235b3d0.c create rectangle                  610 115 710 215 -tags 234f0601 -fill grey"
>>>   ("uplevel" body line 1)
>>>   invoked from within
>>> "uplevel #0 $cmd_from_pd"
>> .hc
>> ----------------------------------------------------------------------------
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