I've made the set of predefined named parameters user-extensible.
This can now access arbitrary combinations of interpreter state and make it a
predicate which can be used like so:
o100 if [#<_my_predicate>]
....
o100 endif
When I wrote the predefined named parameters code, I just made up a list of
'potentially useful' parameters. Since usefulness varies according to context,
I generalized it you can add your own, no C++ required. The basic trick is: if
a function is defined in the namedparams Python module, a predefined named
parameter of same name appears automatically in the RS274NGC namespace; if the
named parameter is referred to in an expression, the underlying Python function
is evaluated.
So for the above example, one needs:
def _my_predicate(self):
... arbitrary Python code perusing interpreter intestines ..
return <somevalue> # which can be refereed to as #<_my_predicate> in
expressions
It's documented here:
http://www.linuxcnc.org/docs/devel/html/remap/structure.html#_adding_predefined_named_parameters_a_id_sec_adding_predefined_named_parameters_a
and it's in master as of today.
- Michael
Am 23.03.2012 um 08:53 schrieb Michael Haberler:
>
> Am 22.03.2012 um 10:09 schrieb Erik Christiansen:
>
>> It is my (limited)
>> understanding that LinuxCNC cannot intrinsically test the current state
>> of its many modalities, so we don't seem to have anything that can be
>> checked, AIUI.
>
> ...
>>
>> But LinuxCNC doesn't know its current state in an exportable way, so has
>> nothing to put on a stack, AIUI.
>
>
> As for introspection on state at the gcode level, see
> http://www.linuxcnc.org/docs/devel/html/gcode/overview.html#_predefined_named_parameters_a_id_sec_predefined_named_parameters_a
> .
>
> If that doesnt suffice, go to the embedded Python level which has practically
> all of the interpreter state exposed, and then some (task).
>
> See tests/remap/introspect/oword.py for state access.
>
> Exporting state from Python is left as an exercise for the reader;)
>
>
> -m
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