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########################################################################
##
## Copyright (C) 2013-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
%!function r = sigma (opt)
%! global sigma_call;
%! if (nargin == 0)
%! sigma_call = "function";
%! r = 1;
%! elseif (ischar (opt))
%! sigma_call = "command";
%! r = 1;
%! else
%! sigma_call = "unexpected";
%! endif
%!endfunction
%!
%!function f1 ()
%! ## ERROR; sigma used as variable and later parsed as command
%! sigma = svd (1);
%! eval ("sigma -1;");
%!endfunction
%!
%!function f1a ()
%! ## Assignment of eval result means eval code is not parsed as command.
%! sigma = svd (1);
%! val = eval ("sigma -1;");
%!endfunction
%!
%!function f2 ()
%! ## ERROR; sigma used as variable and later parsed as command
%! [u, sigma, v] = svd (1);
%! eval ("sigma -1;");
%!endfunction
%!
%!function f2a ()
%! ## Assignment of eval result means eval code is not parsed as command.
%! [u, sigma, v] = svd (1);
%! val = eval ("sigma -1;");
%!endfunction
%!
%!function f3 (sigma)
%! ## No assignment of eval result means eval code is parsed as command.
%! ## If f3 is called with a value for sigma, it will be used. Otherwise,
%! ## search for the function sigma and call with no arguments.
%! eval ("sigma -1;");
%!endfunction
%!
%!function f3a (sigma)
%! ## Assignment of eval result means eval code is not parsed as command.
%! val = eval ("sigma -1;");
%!endfunction
%!
%!function f4 ()
%! ## No assignment of eval result means eval code is parsed as command.
%! eval ("sigma -1;");
%!endfunction
%!
%!function f4a ()
%! ## Assignment of eval result means eval code is not parsed as command.
%! val = eval ("sigma -1;");
%!endfunction
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! ## Matlab complains about sigma previously being used as a variable
%! ## before being used as a command.
%! fail ("f1 ()", "used as variable and later as function");
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f1a ();
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! ## Matlab complains about sigma previously being used as a variable
%! ## before being used as a command.
%! fail ("f2 ()", "used as variable and later as function");
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f2a ();
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f3 ();
%! assert (sigma_call, "command");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f3a ();
%! assert (sigma_call, "function");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! ## NOTE: this result disagrees with Matlab, which evaluates sigma
%! ## as a command-style function even though there is a variable named
%! ## sigma defined in the workspace prior to evaluating the function
%! ## call (compare with f1() and f2() above).
%! fail ("f3 (1)", "used as variable and later as function");
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f3a (1);
%! assert (sigma_call, "none");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f4 ();
%! assert (sigma_call, "command");
%! clear -global sigma_call
%!
%!test <55610>
%! global sigma_call;
%! sigma_call = "none";
%! f4a ();
%! assert (sigma_call, "function");
%! clear -global sigma_call
%!function r = f_eval_fun ()
%! evalin_value = "this is f_eval_fun";
%! r = evalin ("caller", "evalin_value");
%!endfunction
%!function r = g_eval_fun ()
%! evalin_value = "this is g_eval_fun";
%! r = evalin ("caller", "f_eval_fun ()");
%!endfunction
%!function r = h_eval_fun ()
%! evalin_value = "this is h_eval_fun";
%! r = f_eval_fun ();
%!endfunction
%!shared evalin_value
%! evalin_value = "this is the caller";
%!assert <*59847> (f_eval_fun (), "this is the caller");
%!assert <*59847> (g_eval_fun (), "this is the caller");
%!assert <*59847> (h_eval_fun (), "this is h_eval_fun");
%!function r = f_asgn_fun ()
%! asgnin_value = "this is f_asgn_fun";
%! assignin ("caller", "asgnin_value", "f value");
%! r = asgnin_value;
%!endfunction
%!function r = g_asgn_fun ()
%! asgnin_value = "this is g_asgn_fun";
%! evalin ("caller", "f_asgn_fun ();");
%! r = asgnin_value;
%!endfunction
%!function r = h_asgn_fun ()
%! asgnin_value = "this is h_asgn_fun";
%! f_asgn_fun ();
%! r = asgnin_value;
%!endfunction
%!test <*59847>
%! asgnin_value = "this is the caller";
%! assert (f_asgn_fun (), "this is f_asgn_fun");
%! assert (asgnin_value, "f value");
%!test <*59847>
%! asgnin_value = "this is the caller";
%! assert (g_asgn_fun (), "this is g_asgn_fun");
%! assert (asgnin_value, "f value");
%!test <*59847>
%! asgnin_value = "this is the caller";
%! assert (h_asgn_fun (), "f value");
%! assert (asgnin_value, "this is the caller");
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