/usr/share/octave/packages/general-1.3.4/@dict/subsref.m is in octave-general 1.3.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File} {d =} subsref (d, s)
## Overloaded subsref for dictionaries.
## @end deftypefn
## Author: Jaroslav Hajek <highegg@gmail.com>
function varargout = subsref (d, s)
if (isempty (s))
error ("dict: missing index");
endif
switch (s(1).type)
case "()"
ind = s(1).subs;
if (numel (ind) == 1)
ind = ind{1};
else
error ("dict: needs exactly one index");
endif
if (ischar (ind))
i = lookup (d.keys, ind, "m");
if (i)
e = d.values {i};
else
error ("key does not exist: %s", ind);
endif
elseif (iscellstr (ind))
i = lookup (d.keys, ind, "m");
if (all (i(:)))
e = reshape (d.values (i), size (ind)); # ensure correct shape.
else
## Report the first non-existing key.
error ("key does not exist: %s", ind{find (i == 0, 1)});
endif
else
error ("invalid index");
endif
case "."
fld = s.subs;
switch (fld)
case 'keys'
e = d.keys;
case 'values'
e = d.values;
otherwise
error ("@dict/subsref: invalid property \"%s\"", fld);
endswitch
otherwise
error ("invalid subscript type");
endswitch
if (numel (s) > 1)
varargout = {subsref(e, s(2:end))};
else
varargout = {e};
endif
endfunction
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