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## Copyright (C) 2019 John Donoghue <john.donoghue@ieee.org>
##
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
## -*- texinfo -*-
## @deftypefn {} {@var{val} = } subsref (@var{dev}, @var{sub})
## subref for ultrasonic
##
## @seealso{ultrasonic}
## @end deftypefn
function val = subsref (p, s)
if isempty(s)
error ("ultrasonic.subsref missing index");
endif
if s(1).type == "."
fld = tolower(s(1).subs);
switch (fld)
case "pins"
val = {};
for i = 1:numel(p.pins)
val{end+1} = p.pins{i}.name;
endfor
case "outputformat"
val = p.outputformat;
case "parent"
val = p.parent;
case "triggerpin"
val = p.pins{1}.name;
case "echopin"
if numel(p.pins) > 1
val = p.pins{2}.name;
else
val = [];
endif
otherwise
error ("ultrasonic.subsref invalid property '%s'", fld);
endswitch
else
error("unimplemented ultrasonic.subsref type");
endif
if (numel (s) > 1)
val = subsref (val, s(2:end));
endif
endfunction
%!test
%! ar = arduino();
%! x = ultrasonic (ar, "d2", "d3");
%! assert (isarduino(x.parent))
%! assert (x.triggerpin, "d2")
%! assert (x.echopin, "d3")
%! assert (numel(x.pins) == 2)
%! fail ("x.invalid")
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