[PD-dev] the future of [declare] and canvas_savedeclarationsto()

[Hans-Christoph Steiner]

On May 20, 2008, at 2:12 PM, Frank Barknecht wrote:

> Hallo,
> Hans-Christoph Steiner hat gesagt: // Hans-Christoph Steiner wrote:
>
>> [declare -std*] modifies the global namespace [declare] with -lib and
>> -path modify the canvas-local namespace.
>
> Not according to the help-file for declare, where the only difference
> between the options with "std" and those without is how the arguments
> are evaluated: "relative to the patch" for the naked, "relative to Pd"
> for the "std"-decorated versions of the options. There's nothing about
> scope in the help file (and I'm currently not taking into account how
> declare works in reality, as that is deliberatly restricted in 0.41)

I got it a bit mixed up the first time, -lib and -stdlib change the  
canvas-local path, and -path and -stdpath change the global path.  
According to the C code, that is what it does.  Check out  
canvas_declare(), starting at line 1478:

http://pure-data.svn.sourceforge.net/viewvc/pure-data/trunk/pd/src/ 
g_canvas.c?view=markup

This means append to the canvas-local search path(e->ce_path):

e->ce_path = namelist_append(e->ce_path, strbuf, 0);

.hc

>
>> Tcl has namespaces that can be used across procedure/class, provided
>> you import them into procedure/class.  I suppose Pd could have that
>> too, so you could set dependencies across a whole project.  But I
>> don't see this as being especially useful in Pd, and it would add
>> complexity.
>>
>> If I write an objectclass (aka abstraction), I only want to have to
>> think about what libs that objectclass needs.  I don't want to think
>> about how those libs related to other files in the project at that
>> point.  Having the local namespace per objectclass/abstraction allows
>> for this.
>
> Agreed. But it seems that's not what [declare] does ATM or was  
> intended
> to do when Miller wrote it, while [import] was designed to do it, IIR.
> Lets not confuse the two.
>
> Ciao
> -- 
> Frank Barknecht
>
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