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########################################################################
##
## Copyright (C) 2008-2024 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/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{msgstr} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs})
## @deftypefnx {} {@var{msgstr} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs}, "string")
## @deftypefnx {} {@var{msgstruct} =} nargchk (@var{minargs}, @var{maxargs}, @var{nargs}, "struct")
## Return an appropriate error message string (or structure) if the number of
## inputs requested is invalid.
##
## This is useful for checking to see that the number of input arguments
## supplied to a function is within an acceptable range.
##
## @strong{Caution}: @code{nargchk} is scheduled for deprecation. Use
## @code{narginchk} in all new code.
## @seealso{narginchk, nargoutchk, error, nargin, nargout}
## @end deftypefn
function msg = nargchk (minargs, maxargs, nargs, outtype = "string")
if (nargin < 3)
print_usage ();
elseif (minargs > maxargs)
error ("nargchk: MINARGS must be <= MAXARGS");
elseif (! any (strcmpi (outtype, {"string", "struct"})))
error ('nargchk: output type must be either "string" or "struct"');
elseif (! (isscalar (minargs) && isscalar (maxargs) && isscalar (nargs)))
error ("nargchk: MINARGS, MAXARGS, and NARGS must be scalars");
endif
msg = struct ("message", "", "identifier", "");
if (nargs < minargs)
msg.message = "not enough input arguments";
msg.identifier = "Octave:nargchk:not-enough-inputs";
elseif (nargs > maxargs)
msg.message = "too many input arguments";
msg.identifier = "Octave:nargchk:too-many-inputs";
endif
if (strcmpi (outtype, "string"))
msg = msg.message;
elseif (isempty (msg.message))
## Compatibility: Matlab returns a 0x1 empty struct when nargchk passes
msg = resize (msg, 0, 1);
endif
endfunction
## Tests
%!shared stnul, stmin, stmax
%! stnul = resize (struct ("message", "", "identifier", ""), 0, 1);
%! stmin = struct ("message", "not enough input arguments",
%! "identifier", "Octave:nargchk:not-enough-inputs");
%! stmax = struct ("message", "too many input arguments",
%! "identifier", "Octave:nargchk:too-many-inputs");
%!assert (nargchk (0, 1, 0), "")
%!assert (nargchk (0, 1, 1), "")
%!assert (nargchk (1, 1, 0), "not enough input arguments")
%!assert (nargchk (0, 1, 2), "too many input arguments")
%!assert (nargchk (0, 1, 2, "string"), "too many input arguments")
## Struct outputs
%!assert (nargchk (0, 1, 0, "struct"), stnul)
%!assert (nargchk (0, 1, 1, "struct"), stnul)
%!assert (nargchk (1, 1, 0, "struct"), stmin)
%!assert (nargchk (0, 1, 2, "struct"), stmax)
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